communication method, network device and terminal

专利摘要:
this application provides a communication method, a network device and a terminal. the communication method includes: determining, by a first network device, at least one candidate target cell and first configuration information, where the first configuration information is used to trigger a terminal to determine one of at least one candidate target cell as cell to-be-transferred-to; and sending, by the first network device, a first message to the terminal, where the first message includes the first cell indication information and the first configuration information, and the first cell indication information is used to indicate at least a candidate target cell. the communication method, network device and terminal provided in this application can increase the transfer success rate of a terminal, thereby improving the communication quality of the terminal.
公开号:BR112019019883A2
申请号:R112019019883
申请日:2018-03-23
公开日:2020-04-22
发明作者:Zhang Hongping；Yan Le；Xu Min；Zeng Qinghai；Peng Wenjie；Xu Xiaoying
申请人:Huawei Tech Co Ltd；
IPC主号:

专利说明:

COMMUNICATION METHOD, NETWORK DEVICE AND TERMINAL TECHNICAL FIELD [001] This patent application refers to the field of communications and, more specifically, to a method of communication, a network device and a terminal.
BACKGROUND [002] In a wireless communications system, when the quality of a link between a terminal and a serving cell deteriorates more and more and / or the quality of a link between the terminal and an adjacent cell improves more and more, the terminal is transferred to the adjacent cell. Current transfer procedure is as follows.
[003] A source base station sends measurement configuration information to the terminal, and the terminal performs measurement based on measurement configuration information. When a condition to notify a measurement report is met, the terminal notifies a measurement result to the source base station. After selecting a suitable target base station making a transfer decision based on the measurement result notified by the terminal, the source base station sends a transfer request message to the target base station. After receiving the transfer request message, the target base station makes an admission control decision, in other words, determines whether to accept the transfer request. If the target base station accepts the transfer request, the target base station returns a transfer request acknowledgment message to the source base station. The transfer request acknowledgment message carries a parameter configured by the target base station to the terminal.
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After receiving the transfer request acknowledgment message, the source base station sends a transfer command to the terminal. The transfer command carries the parameter configured by the target base station to the terminal. After receiving the transfer command, the terminal accesses the target base station based on the parameter carried in the transfer command.
[004] In the aforementioned transfer mode of the terminal, a relatively high transfer failure rate occurs at the terminal, which consequently affects the data communication of the terminal. For example, when the terminal moves fast or there is an obstacle between the terminal and the source base station or when a 5G high frequency system (whose operating frequency band is greater than or equal to 6 GHz) is involved, the terminal transfer fails.
SUMMARY [005] This patent application provides a method of communication, a network device and a terminal, to increase the transfer success rate of a terminal, thereby improving the communication quality of the terminal.
[006] According to a first aspect, this patent application provides a method of communication. The communication method includes: determining, by a first network device, at least one candidate target cell and first configuration information, where the first configuration information is used to trigger a terminal to determine one of at least one candidate target cell as a cell to which transfer can be made, and the first network device is a network device to which a network
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3/79 serving cell currently accessed belongs to; and sending, by the first network device, a first message to the terminal, where the first message includes first cell indication information and first configuration information, and the first cell indication information is used to indicate at least one target cell candidate.
[007] In the communication method, the first network device sends the first cell indication information and the first configuration information to the terminal, so that the terminal can determine, based on the first message, whether the terminal needs to be transferred to the candidate target cell indicated by the first cell indication information, and determines a cell that is at least one candidate target cell and to which the terminal needs to be transferred. The terminal can then be transferred to the cell. In this way, even if the terminal moves fast or there is an obstacle between the terminal and a source base station affecting the signal quality between the terminal and the source base station, the terminal can still be transferred to a target cell, so that a terminal transfer success rate can be increased and the communication quality of the terminal is increased.
[008] With reference to the first aspect, in a first possible implementation, the first message can also include at least one of the following information: valid time of the first message, first indication information, or second configuration information, the first indication information is used to indicate a transfer priority for at least one candidate target cell, and the second configuration information is used by the terminal
Petition 870190112659, of 11/04/2019, p. 15/91 to cancel a determination operation, based on the first message, of the cell to which a transfer can be made.
[009] If the first message includes the valid time of the first message, the terminal can perform a first operation based on the first message within the valid time, but no longer performs the first operation based on the first message when the valid time expires. In this way, the use of terminal resources can be improved.
[0010] It should be understood that the valid time of the first message can be understood as the valid time of various information included in the first message.
[0011] If the first message includes the first indication information, the terminal can determine the cell to which the first configuration information in the first message and other information can be transferred, using the candidate target cell priority indicated by the first indication information. Specifically, the terminal can determine a candidate target cell with a high priority as the cell to which it can be transferred. In this way, the terminal can determine a better cell to which transfer can be made, thereby further increasing the transfer success rate of the terminal.
[0012] If the first message includes the second configuration information, the terminal can determine, according to the second configuration information, that there is no need to determine the cell to which transfer can be made based on the various information in the first message , in other words, cancel the operation
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5/79 determining the cell to which transfer can be made. In this way, the use of terminal resources can be improved.
[0013] With reference to the first aspect or the first possible implementation, in a second possible implementation, the communication method may also include: sending, by the first network device, a second message to a second network device, where the second message includes information indicating a second cell belonging to the second network device; and receiving, by the first network device, a reply message for the second message, where the reply message for the second message includes information indicating a cell that is from the second cell and that the terminal is allowed to access, and the determination, by a first network device, of at least one candidate target cell may specifically include: determining, by the first network device, at least one candidate target cell based on the indication information of the cell that is from the second cell and that the terminal is allowed to access.
[0014] The second message can be a transfer request message or another message. If the second message is a transfer request message, the transfer request message can carry a piece of indication information, for example, indication information of a binary bit 0 or 1, a Boolean value, or an information element , to indicate that the transfer request message is a transfer request message for a cell determination scenario that the terminal can transfer to,
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6/79 to distinguish the transfer request message from a conventional transfer request message.
[0015] In this implementation, the first network device sends information regarding one or more candidate cells to the second network device, and requests that the second network device determine a cell that is from one or more candidate cells and for which the terminal can be transferred. Then the first network device can use the cell determined by the second network device as the candidate target cell of the terminal, and send the first cell indication information used to indicate the candidate target cells to the terminal. Since the candidate target cell is determined by the second network device, the transfer success rate after the terminal determines to be transferred to the candidate target cell is higher. In other words, this implementation can further increase the terminal's transfer success rate.
[0016] It should be noted that the first network device can send the second message to a plurality of different second network devices, and finally send the first cell indication information to the terminal. In this case, the candidate target cell indicated by the first cell indication information is a cell that the plurality of second network devices allows the terminal to access.
[0017] Optionally, the first network device can send measurement configuration information to the terminal, and receive a measurement report that is sent by the terminal
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7/79 based on measurement configuration information. Then the first network device can determine, based on the cell signal quality recorded in the measurement report, a candidate cell to which the terminal can be transferred, and send the second message to a network device to which the candidate cell belongs . In other words, the candidate cell carried in the second message sent by the first network device to the second network device can be determined by the first network device based on the signal quality notified by the terminal. In this way, the candidate target cell finally indicated by the first network device to the terminal is a cell that is more suitable for transfer, so that the transfer success rate of the terminal can be further increased.
[0018] With reference to the second possible implementation, in a third possible implementation, the second message can still carry a terminal context.
[0019] In this implementation, before sending the first cell indication information and the first configuration information to the terminal, the first network device can first send the context of the terminal to the second network device. Thus, when the terminal determines, based on the first message, to execute transfer and it is transferred to a cell of at least one candidate target cell, a second network device to which the cell belongs already stores the context of the terminal, so that the Communication between the terminal and the second network device can start more quickly, thereby improving the communication quality of the terminal.
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8/79 [0020] With reference to the third possible implementation, in a fourth possible implementation, the second message can still carry valid time from the terminal context.
[0021] In this implementation, the second message sent by the first network device to the second network device can still carry the valid time from the terminal context, to indicate the second network device to release the context after the valid time has expired. In this way, the second network device can release the terminal context after the valid time has expired.
[0022] With reference to any of the second to fourth possible implementations, in a fifth possible implementation, the reply message for the second message may still carry third configuration information, the third configuration information may include at least one of the following information : a first temporary identifier or information regarding a first dedicated random access channel (RACH) preamble that is allocated by the second network device, and the first temporary identifier and information relating to the first dedicated RACH preamble are used by the terminal to access all or some cells that are in the second cell of the second network device and that the terminal is allowed to access. Correspondingly, the first message sent by the first network device to the terminal can also include the third configuration information.
[0023] In this implementation, if the third configuration information received by the first network device from the second network device includes the
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9/79 temporary identifier allocated by the second network device to the terminal, and the temporary identifier is sent to the terminal in the first message, the terminal can be transferred to the second network device based on the temporary identifier. In this way, the transfer rate of the terminal can be further increased.
[0024] If the third configuration information received by the first network device from the second network device includes information regarding the dedicated RACH preamble allocated by the second network device to the terminal, and information regarding the dedicated RACH preamble is sent to the terminal in the first message, the terminal can perform a random access procedure in the cell to which transfer can be made based on information regarding the dedicated RACH preamble. In this way, the transfer rate of the terminal can be further increased.
[0025] It should be noted that the first dedicated RACH preamble includes a dedicated RACH preamble, allocated by the second network device to the terminal, used to access each cell that is in the second cell and that the terminal is allowed to access. The first temporary identifier includes a temporary identifier, allocated by the second network device to the terminal, used to access each cell that is in the second cell and that the terminal is allowed to access.
[0026] It should be understood that when the second message sent by the first network device to the second network device also includes the valid time of the terminal context, the valid time can also be valid time of the terminal.
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10/79 first temporary identifier and information regarding the first dedicated RACH preamble. To be specific, when the valid time expires, the second network device can release the first temporary identifier and the information regarding the first dedicated RACH preamble.
[0027] With reference to any of the second to fifth possible implementations, in a sixth implementation, the communication method may also include: sending, through the first network device, second indication information to the second network device, where the second information Indicator is used to indicate the second network device to release an allocated resource, based on the second message, by the second network device to the terminal.
[0028] Specifically, if the second message sent by the first network device to the second network device includes the context of the terminal, the second network device can release the context of the terminal according to the second indication information. If the second network device allocates the first temporary identifier to the terminal, the second network device can release the first temporary identifier according to the second indication information. If the second network device allocates the first dedicated RACH preamble to the terminal, the second network device can release the first dedicated RACH preamble according to the second indication information. In this way, the second network device can allocate a resource to another terminal, so that a transfer success rate from the other terminal can be increased.
[0029] Optionally, the first network device can
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11/79 send the second indication information to the second network device when determining to reconfigure the terminal.
[0030] Optionally, after sending the second indication information to the second network device, the first network device can still send a new second message to the second network device. The new second message can carry a new terminal context after reconfiguring the terminal, or indicate the second network device to allocate a new first temporary identifier or first RACH preamble dedicated to the terminal.
[0031] Alternatively, after determining to reconfigure the terminal, the first network device can send a new second message to the second network device. After receiving the new second message, the second network device can release information carried in the second original message, or allocate a new first temporary identifier or first RACH preamble dedicated to the terminal. In this case, the first network device may not send the second indication information dedicated to the second network device.
[0032] With reference to any of the first aspect or from the first to the sixth possible implementations, in a seventh possible implementation, the communication method may also include: sending, by the first network device, third indication information to the terminal, where the third indication information is used to indicate the terminal to cancel for the determination operation, based on the first message, of the cell to which transfer can be made.
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12/79 [0033] In this implementation, when determining that the terminal does not need to be transferred, the first network device can send the third indication information to the terminal, to indicate the terminal to cancel the determination operation, based on the first message, from the cell to which the transfer can be made, in other words, indicate the terminal so as not to determine, based on the first message, the cell to which the transfer can be made. In this way, a terminal resource can be saved, and the terminal transfer success rate can be further increased.
[0034] Optionally, the third indication information can be carried in a radio resource control reset message, or an RRC reset message itself can implicitly indicate the terminal to cancel the cell determination operation for which it can transfer is made.
[0035] In addition, optionally, after indicating, using the RRC reconfiguration message, the terminal to cancel the determination of the cell to which a transfer can be made, the first network device can still send a new first message to the terminal .
[0036] It should be noted that if the first network device reconfigures only related information from the first network device on the terminal when reconfiguring the terminal, after receiving the RRC reconfiguration message, the terminal may not cancel the determination of the cell for which transfer can be made, but update the related information of the first network device in the terminal.
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13/79 [0037] With reference to any of the first aspect or from the first to the seventh possible implementations, in a possible eighth implementation, the communication method may also include: receiving, by the first network device, fourth indication information sent by the terminal, where the fourth indication information is used to indicate the first network device to send the first message to the terminal. Correspondingly, the sending of a first message to the terminal by the first network device may include: sending the first message to the terminal by the first network device according to the fourth indication information.
[0038] In this implementation, the first network device receives the fourth terminal indication information, and sends the first message to the terminal according to the fourth terminal indication information. In other words, when it does not receive fourth indication information from the terminal, the first network device can make a transfer decision based on the measurement report sent by the terminal, and control, by sending a transfer command to the terminal, the terminal to perform the transfer. This implementation can improve the transfer flexibility of the terminal.
[0039] With reference to any of the first aspect or the possible implementations mentioned above, in a ninth possible implementation, the communication method also includes: receiving, by the first network device, a message requesting status information from the number of sequence sent by the second network device, where the terminal was transferred to the second network device.
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14/79 [0040] In the communication method, after the terminal accesses the second network device, the first network device forwards data received by the first network device to the second network device according to a request from the second network device. In this way, the communication efficiency can be improved.
[0041] With reference to any of the first aspect or from the first to the third possible implementations, in a tenth possible implementation, the communication method may also include: receiving, by the first network device, a context request message sent by the second network device, where in this case, the terminal has been transferred to the second network device, and the second network device is a network device to which the cell that can be transferred belongs to, and the context request message is used to request the context of the terminal; and sending, by the first network device, the context of the terminal to the second network device.
[0042] In this implementation, after the terminal is transferred to the second network device, the first network device sends the context of the terminal to the second network device according to the request of the second network device. This can improve the resource utilization of the second network device, so that a transfer success rate from another terminal can be increased.
[0043] With reference to any of the first aspect or the first to the ninth possible implementations, in a possible eleventh possible implementation, the communication method
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15/79 may also include: receiving, by the first network device, a first notification message sent by the terminal, where the first notification message carries information indicating the cell to which transfer can be made; and sending, by the first network device based on the first notification message, terminal data and a sequence number status transfer message to a network device to which the cell to which the transfer can be made belongs.
[0044] Based on the first notification message, the first network device interrupts the allocation of a PDCP sequence number to a data packet, and sends the sequence number status transfer message to the second network device. The terminal data may include an uplink data packet already sent by the terminal and a downlink data packet to which a sequence number has been allocated by the first network device, but whose successful transmission to the terminal has not been recognized.
[0045] With reference to any of the first aspect or the first to the ninth possible implementations, in a twelfth possible implementation, the communication method may also include: receiving, by the first network device, a request message sent by the second device network, where the request message is used to request a transfer message of terminal sequence number status and terminal data, in which case the terminal has been transferred to a cell on the second network device; and send, by the first network device, the status transfer message
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16/79 terminal sequence and terminal data to the second network device according to the request message.
[0046] According to the request message, the first network device interrupts the allocation of a PDCP sequence number to the data packet, and sends the sequence number status transfer message to the second network device. The terminal data may include an uplink data packet already sent by the terminal and a downlink data packet to which a sequence number has been allocated by the first network device, but whose successful transmission to the terminal has not been recognized.
[0047] With reference to any of the first aspect or the possible implementations mentioned above, in a possible implementation, the first configuration information includes at least one of the second information: signal quality threshold information, fifth indication information, or sixth indication information, where the signal quality threshold information is used to trigger the terminal to determine the cell to which transfer can be made when a difference between the signal quality of the serving cell and the signal quality of a cell at least one candidate target cell is greater than or equal to a threshold of signal quality difference, or when the signal quality of the serving cell is less than a first signal quality threshold and the signal quality of a cell in the at least one candidate target cell is greater than or equal to a second signal quality threshold; the fifth indication information is used to indicate threshold information on the number of transmission failures,
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17/79 and the transmission fault quantity threshold information is used to trigger, after a terminal transmission fault quantity reaches a transmission fault threshold threshold, the terminal to perform the cell determination operation for the which transfer can be made; and the sixth indication information is used to indicate a radio link failure event, and the radio link failure event is used to trigger, after a radio link from the terminal fails, the terminal to perform the determination operation cell to which transfer can be made.
[0048] According to a second aspect, this patent application provides a method of communication which includes: receiving, by a terminal, a first message sent by a first network device, where the first message includes first cell indication information and first configuration information, the first cell indication information is used to indicate at least one candidate target cell, the first configuration information is used to trigger the terminal to determine one of at least one cell for which it can be made. transfer, and the first network device is a network device to which the cell currently being accessed by the terminal belongs; and determining, by the terminal, the cell to which transfer can be made in at least one candidate target cell based on the first message.
[0049] In the communication method, the terminal receives the first cell indication information and the first configuration information that are sent by the first network device, it determines, based on the first
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18/79 message, if the terminal needs to be transferred to the candidate target cell indicated by the first cell indication information, and determines a cell that is at least one candidate target cell to which the terminal needs to be transferred. The terminal can then be transferred to the cell. Thus, even if the terminal moves fast or there is an obstacle between the terminal and a source base station that affects the signal quality between the terminal and the source base station or even if a high frequency system is involved, the terminal it can also be transferred to a target cell, so that a terminal transfer success rate can be increased and the communication quality of the terminal is improved.
[0050] With reference to the second aspect, in a first possible implementation, the first message also includes at least one of the following information: valid time of the first message, first indication information, or second configuration information, the first indication information is used to indicate a transfer priority for at least one candidate target cell, and the second configuration information is used by the terminal to cancel a determination operation, based on the first message, of the cell to which a transfer can be made.
[0051] If the first message includes the valid time of the first message, the terminal can determine the cell to which transfer can be made based on the first message within the valid time, but does not determine the cell to which transfer can be made based on in the first message when the valid time expires. That way,
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19/79 the use of terminal resources can be improved.
[0052] If the first message includes the first indication information, the terminal determines the cell to which transfer can be made based on the first message using the candidate target cell priority indicated by the first indication information. Specifically, the terminal can determine a candidate target cell with a high priority as the target transfer cell. In this way, the terminal can determine a better cell to which transfer can be made, so that the terminal can increase the transfer success rate.
[0053] If the first message includes the second configuration information, the terminal can determine, according to the second configuration information, that there is no need to determine the cell to which transfer can be made based on the first message. In this way, the use of terminal resources can be improved.
[0054] Specifically, the terminal can delete or discard the first message and various information in the first message.
[0055] With reference to the second aspect or the first possible implementation, in a second possible implementation, the first message may also include third configuration information, the third configuration information includes at least one of the following information: a first temporary identifier or information referring to a first preamble to RACH, and the first temporary identifier and information referring to
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20/79 to the first dedicated RACH preamble are used by the terminal to access a cell that is from a second cell that belongs to the second network device and that the terminal is allowed to access.
[0056] In this implementation, if the third configuration information includes the first temporary identifier, the terminal can be transferred to the second network device based on the first temporary identifier, so that a terminal transfer success rate can be increased .
[0057] If the third configuration information includes the information regarding the first dedicated RACH preamble, the terminal can be transferred to the second network device based on the information regarding the first dedicated RACH preamble, so that the success rate transfer rate can be further increased.
[0058] The first dedicated RACH preamble or the first temporary identifier can be allocated by the second network device to the terminal, and can be used to access all or some cells that are from the second cell and that the terminal is allowed to access.
[0059] With reference to the second aspect or the first or the second possible implementations, in a third possible implementation, the communication method may also include: receiving, through the terminal, the third indication information sent by the first network device, where the third indication information is used to indicate the terminal to cancel the determination operation, based on the first message, of the cell to which it can be made
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21/79 transfer.
[0060] In this implementation, when determining that the terminal does not need to be transferred, the first network device can send the third indication information to the terminal, to indicate the terminal to cancel the determination operation, based on the first message, of the cell to which transfer can be made, in other words, indicate the terminal so as not to determine, based on the first message, the cell to which transfer can be made. In this way, a terminal resource can be saved, and the terminal transfer success rate can be further increased.
[0061] Optionally, the third indication information can be carried in a radio resource control reset message, or a RRC reset message itself can implicitly indicate the terminal to cancel the cell determination operation for which it can transfer is made.
[0062] In addition, optionally, after the terminal cancels the determination of the cell to which transfer can be made according to the indication of the RRC reconfiguration message, the terminal can still receive a new first message sent by the first network device .
[0063] It should be noted that if the first network device reconfigures only related information from the first network device on the terminal when reconfiguring the terminal, after receiving the RRC reconfiguration message, the terminal may not cancel the determination of the cell for which transfer can be made, but update the
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22/79 related information from the first network device on the terminal.
[0064] With reference to any of the second aspect or from the first to the third possible implementations, in a fourth possible implementation, the communication method also includes: sending, through the terminal, the fourth indication information to the first network device, where the fourth indication information is used to indicate the first network device to send the first message to the terminal. Correspondingly, the receipt, by a terminal, of a first message sent by a first network device may include: receiving, by the terminal, the first message that is sent by the first network device according to the fourth indication information.
[0065] In this implementation, the terminal sends the fourth indication information to the first network device, so that the first network device can send the first message to the terminal according to the fourth indication information. In other words, when the fourth indication information of the terminal is not received, the first network device can make a transfer decision based on a measurement report sent by the terminal, and control, by sending a transfer message to the terminal, the terminal performing the transfer. This implementation can improve the transfer flexibility of the terminal.
[0066] With reference to any of the second aspect or from the first to the fourth possible implementations, in a fifth possible implementation, the communication method can also include: send, through the terminal, a first message
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23/79 notification to the first network device, where the first notification message carries indication information from the cell to which transfer can be made, so that the first network device sends, based on the first notification message, data from the terminal and a sequence number status transfer message to a network device to which the cell to which the transfer can be made belongs.
[0067] With reference to any of the second aspect or the possible implementations mentioned above, in a possible implementation, the first configuration information includes at least one of the following information: signal quality threshold information, fifth indication information, or sixth indication information, where the signal quality threshold information is used to trigger the terminal to determine the cell to which transfer can be made when a difference between the signal quality of the serving cell and the signal quality of a cell at least one candidate target cell is greater than or equal to a threshold of signal quality difference, or when the signal quality of the serving cell is less than a first signal quality threshold and the signal quality of a cell in the at least one candidate target cell is greater than or equal to a second signal quality threshold; the fifth indication information is used to indicate transmission fault quantity threshold information, and transmission fault quantity threshold information is used to trigger, after a terminal transmission fault quantity reaches a quantity fault threshold. transmission failures, the terminal to be executed
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24/79 the operation to determine the cell to which a transfer may be made; and the sixth indication information is used to indicate a radio link failure event, and the radio link failure event is used to trigger, after a radio link from the terminal fails, the terminal to perform the determination operation cell to which transfer can be made.
[0068] According to a third aspect, a network device is provided. The network device includes a module configured to perform the communication method according to either the first aspect or the possible implementations of the first aspect.
[0069] According to a fourth aspect, a terminal is provided. The terminal includes a module configured to execute the communication method according to either the second aspect or the possible implementations of the second aspect.
[0070] According to a fifth aspect, a network device is provided that includes a processor and a transmitter. The processor is configured to execute code. When the code is executed, the processor and the transmitter implement the communication method according to either the first aspect or the possible implementations of the first aspect. Optionally, a receiver can also be included.
[0071] According to a sixth aspect, a terminal is provided that includes a processor and a receiver. The processor is configured to execute code. When the code is executed, the processor and the receiver implement the communication method according to any of the second
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25/79 aspect or the possible implementations of the second aspect. Optionally, a transmitter can also be included.
[0072] According to a seventh aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores program code for execution by a network device, and the program code includes an instruction used to execute the communication method in accordance with any of the first aspect or possible implementations of the first aspect.
[0073] According to an eighth aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores program code for execution by a terminal, and the program code includes an instruction used to execute the communication method according to any of the second aspect or possible implementations of the second aspect.
[0074] According to a ninth aspect, a computer program product is provided that includes an instruction. When the computer program product runs on a network device, a network device is enabled to execute the communication method in accordance with any of the first aspect or possible implementations of the first aspect.
[0075] According to a tenth aspect, a computer program product that includes an instruction is provided. When the computer program product runs on a terminal, a terminal is enabled to execute the communication method according to either the second aspect or the possible implementations of the second aspect.
[0076] According to an eleventh aspect, it is
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26/79 provided a method of communication. The method of communication includes: receiving, by a second network device, a second message sent by a first network device, where the second message includes a terminal context and valid time of the context.
[0077] Optionally, the second network device can release the context after the valid context time has expired. Optionally, the valid time can be valid time for a temporary identifier or for a dedicated RACH preamble allocated by the second network device to the terminal. If the valid time expires, the second network device can release the temporary identifier or the dedicated RACH preamble.
[0078] Optionally, the second network device can receive second indication information sent by the first network device, and release, according to the second indication information, the terminal context or a temporary identifier or dedicated RACH preamble allocated to the terminal.
[0079] Alternatively, after receiving a new second
message, O second device network can release the context of terminal or even the valid time of context included at Monday message previous, or release one
temporary identifier or a dedicated RACH preamble allocated to the terminal.
[0080] The technical resource of the second network device in the first aspect or in the second aspect is applicable to the second network device in the eleventh aspect. For brevity, details are not described again in this document.
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27/79 [0081] According to a twelfth aspect, a network device is provided. The network device includes a module configured to perform the communication method in accordance with either the eleventh aspect or the possible implementations of the eleventh aspect.
[0082] In accordance with a thirteenth aspect, a network device is provided that includes a processor and a receiver. The processor is configured to execute code. When the code is executed, the processor and receiver implement the communication method according to either the first aspect or the possible implementations of the first aspect. Optionally, a transmitter can also be included.
[0083] In accordance with a fourteenth aspect, a computer-readable medium is provided. The computer-readable medium stores program code for execution by a network device, and the program code includes an instruction for executing the communication method in accordance with any of the eleventh aspect or possible implementations of the eleventh aspect.
[0084] In accordance with a fifteenth aspect, a computer program product is provided that includes an instruction. When the computer program product runs on a terminal, a network device is enabled to execute the communication method in accordance with either the eleventh aspect or the possible implementations of the eleventh aspect.
BRIEF DESCRIPTION OF THE DRAWINGS [0085] Figure 1 is a schematic architectural diagram
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28/79 of a communication system to which a communication method, a network device and a terminal according to the modalities of this patent application can be applied;
Figure 2 is a schematic flowchart of a method of communication according to an embodiment of this patent application;
Figure 3 is a schematic flowchart of a method of communication according to another embodiment of this patent application;
Figure 4 is a schematic flow chart of a method of communication according to another embodiment of this patent application;
Figure 5 is a schematic diagram of a terminal protocol stack according to an embodiment of this patent application;
Figure 6 is a schematic diagram of a terminal protocol stack according to another embodiment of this patent application;
Figure 7 is a schematic diagram of a protocol stack from a terminal after the terminal releases the source cell protocol stack according to an embodiment of this patent application;
Figure 8 is a schematic diagram of a protocol stack from a terminal after the terminal releases the source cell's protocol stack according to another embodiment of this patent application;
Figure 9 is a schematic diagram of a network side protocol stack according to an embodiment of this patent application;
Figure 10 is a schematic structural diagram of a
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Network device according to an embodiment of this patent application;
Figure 11 is a schematic structural diagram of a terminal according to an embodiment of this patent application;
Figure 12 is a schematic structural diagram of a network device according to another embodiment of this patent application;
Figure 13 is a schematic structural diagram of a terminal according to another embodiment of this patent application; and Figure 14 is a schematic structural diagram of a network device according to another embodiment of this patent application.
DESCRIPTION OF MODALITIES [0086] Figure 1 is a schematic architectural diagram of a communication system to which a communication method, a terminal and a network device according to the modalities of this patent application can be applied. It should be noted that the modalities of this patent application are not limited to a system architecture shown in Figure 1. In addition, devices in Figure 1 can be hardware, or software obtained through functional division, or a combination of these.
[0087] It can be learned from Figure 1 that the communication system to which the method of communication according to the modalities of this patent application can be applied can include a network device 110, a terminal 120 and a network device 130. A network device to which a cell currently accessed by terminal 120
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30/79 belongs to network device 110. Terminal 120 can be transferred to a cell of network device 130 under various circumstances. Generally, transferring from terminal 120 to a cell of the network device can also be referred to as transferring from terminal 120 to network device 130.
[0088] An example of network device 110 and network device 130 is a base station. It should be noted that a specific type of base station is not limited in the modalities of this patent application. In systems that use different radio access technologies, devices with a base station function can have different names. For ease of description, in all embodiments of this patent application, devices that provide a wireless communication function for the terminal are collectively referred to as a base station, for example, a base station device on a future network or a device small cell (peak).
[0089] The terminal 120 can be user equipment (user equipment, UE). The UE can communicate with one or more basic networks (core network, CN) through a radio access network (radio access network, RAN). The UE can be referred to as an access terminal, a terminal device, a subscriber unit, a subscriber station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a network device wireless, a user agent, or a user device. The UE can be a cell phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a local mesh station without
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31/79 wire (wireless local loop, WLL), personal digital assistant (personal digital assistant, PDA), a portable device that has a wireless communication function, a computing device, another device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device on the Internet of Things or vehicle Internet, or a terminal device in any form on a future network, or similar.
[0090] Figure 2 is a schematic flowchart of a method of communication according to one embodiment of this patent application. It should be understood that although Figure 2 shows steps or operations of the communication method, these steps or operations are merely examples. Other operations or variations of the operations in Figure 2 can also be performed in this modality of this patent application. In addition, the steps in Figure 2 can be performed in a different order than shown in Figure 2, and not all operations in Figure 2 need to be performed.
[0091] S201. A first network device sends measurement configuration information to a terminal. Correspondingly, the terminal receives the measurement configuration information.
[0092] The first network device is a network device to which a cell currently serving the terminal (referred to as a source cell in this embodiment of this patent application) belongs. The first network device can be a network device 110 in the communications system shown in Figure 1. Generally, the first network device can also be referred to as a source base station.
[0093] The measurement configuration information can
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32/79 include a measurement object, a measurement ID, a report configuration, a measurement interval, and the like.
[0094] S202. After performing the measurement based on the measurement configuration information, the terminal notifies a measurement report to the first network device.
[0095] Correspondingly, the first network device receives the measurement report.
[0096] Specifically, the measurement report can include signal quality of a measured cell, an identifier of the measured cell, and the like.
[0097] S204. After receiving the measurement report, the first network device determines one or more candidate cells.
[0098] For example, the first network device can determine, based on the signal quality of the measured cell, whether conditional transfer to the terminal is necessary. After determining that a conditional transfer to the terminal is required, the first network device can track a cell indicated by the information in the measurement report notified by the terminal, to determine one or more candidate cells. For example, the first network device can determine, as with one or more candidate cells, a cell with relatively good signal quality from the cell indicated by the information in the measured report. It should be noted that the tracking step here is optional, and may not be performed.
[0099] It should be noted that the first network device can alternatively determine the one or more
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33/79 candidate cells otherwise. Examples are not described one by one for description in this embodiment of this patent application. The one or more candidate cells determined here can be used directly as a candidate target cell, in other words, step S205 does not need to be performed. In addition, a candidate target cell can be obtained from one or more candidate cells determined by further determining, for example, performing step S205.
[00100] It should be understood that conditional transfer here means that the first network device preliminarily determines that the terminal needs to be transferred to another cell, and sends a first message to the terminal, so that the terminal still determines whether transfer is necessary and determines a cell to which transfer can be made.
[00101] Based on the one or more candidate cells determined above, the first network device can send a second message to a network device (referred to as a second network device in this embodiment of this patent application) to which one or more more candidate cells belong. Correspondingly, the second network device receives the second message.
[00102] The second message can carry indication information from a second cell, and indication information from the second cell is used to indicate a cell, determined by the first network device, which belongs to the following network device. Specifically, the indication information for the second cell can carry a cell identifier or index, determined by
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34/79 first network device, which belongs to the second network device.
[00103] The second message can be a transfer request message or another message. This is not limited in this embodiment of this patent application.
[00104] The second message can carry indication information used to indicate that the second message is a transfer request message for a case in which the terminal determines the cell to which transfer can be made, so that the second transfer device network can perform a corresponding operation based on the transfer request message. Specifically, the indication information can be represented using a bit 0 or 1, or it can be represented using a Boolean value or an information element.
[00105] If the first network device determines a plurality of candidate cells in step S204, and the plurality of candidate cells belongs to a plurality of second network devices, the first network device sends the second message to each of the plurality of second network devices. Each second message can carry information regarding a candidate cell that belongs to a second network device corresponding to the second message. Specifically, the information regarding the candidate cell can be an identifier or an index of the candidate cell.
[00106] Optionally, the second message can also carry a terminal context, for example, a temporary cell radio network identifier (cell radio
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35/79 network temporary identifier, C-RNTI) of the source cell, an access layer configuration (access stratum, AS), a carrier context, or a physical cell identifier (PCI) or authentication code message authentication code for integrity, MAC-I) of the source cell.
[00107] Optionally, the second message can still carry valid time. The valid time can be implemented using a timer as the valid context time, so that after the valid context time timer expires, the second network device can exclude the context. In this way, the second network device may have more resources to service another terminal, so that a transfer success rate from the other terminal can be increased.
[00108] S205. After receiving the second message, the second network device performs an admission control process.
[00109] The admission control process may include: the second network device determines, based on a network resource status such as second cell load, a cell that is from the second cell and that the terminal is allowed to access, and the second network device can use, as the candidate target cell, the candidate cell that is from the second cell and that the terminal is allowed to access.
[00110] In addition, the second network device can allocate resources to the terminal used to access the candidate cell of the second network device, for example, a temporary identifier (for example, a C-RNTI) and / or a preamble of dedicated RACH.
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36/79 [00111] In this case, if the cell to which the transfer can be made determined by the terminal is the cell to which the dedicated RACH preamble is allocated, when accessing the cell to which the transfer can be made, the terminal can perform a random access procedure with the cell to which transfer can be made using information regarding the dedicated RACH preamble.
[00112] It should be understood that the valid time carried in the second message can not only be used for the context, but also be used as a valid time for the temporary identifier and / or the dedicated RACH preamble. To be specific, when the valid time expires, the second network device can release the temporary identifier and / or the dedicated RACH preamble.
[00113] S206. The second network device sends a reply message for the second message to the first network device.
[00114] Correspondingly, the first network device receives the reply message for the second message.
[00115] The reply message can carry third cell indication information, and the third cell indication information is used to indicate a cell that is from the second network device and that the terminal is allowed to access. The third indication information
cell can indicate an or more cells. THE third information in recommendation in cell can specifically include a identifier or an index of cell that is from
second network device and that the terminal is allowed to access.
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37/79 [00116] Optionally, the reply message can also carry a temporary identifier, allocated by the second network device to the terminal, used to access each of all cells or some cells indicated by the third cell indication information.
[00117] Optionally, the response message can also carry information regarding a dedicated RACH preamble, allocated by the second network device to the terminal, used to access each of all cells or some cells indicated by the third cell indication information .
[00118] The temporary identifier and the information regarding the dedicated RACH preamble can be collectively referred to as third configuration information.
[00119] If the first network device sends the second message to a plurality of second network devices in step S204, the first network device can receive a reply message for the second message sent by each of the plurality of second network devices network.
[00120] The reply message for the second message can be a handover request ACK acknowledgment message or another message. This is not limited in this embodiment of this patent application.
[00121] After receiving the reply message for the second message, the first network device can determine at least one candidate target cell and first configuration information that are used by the terminal to determine the cell for which it can be made
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38/79 transfer. The cell to which a transfer can be made is determined by the terminal in at least one candidate target cell, and the first network device is the network device to which the cell currently accessed by the terminal belongs.
[00122] The cell that can be transferred to is a cell to which the terminal must be transferred from the source cell. The first network device can determine at least one candidate target cell based on the response message sent by one or more network devices. For example, after receiving the response message sent by the second network device, the first network device can obtain cell indication information that is in the response message and that is used to indicate the cell that the second network device allows. the terminal has access, so that the target candidate cell of the terminal can be determined based on the indication of the cell indication information.
[00123] The first configuration information can include signal quality threshold information. For example, the first configuration information can include X dB. When the finish determines that a difference between the signal quality of a cell of the candidate target cell and the signal quality of the serving cell is greater than or equal to X dB, the terminal is triggered to determine the cell as the cell for which transfer can be made.
[00124] Alternatively, the first configuration information can include Y dB and Z dB. In this case, when the terminal determines that the signal quality of the serving cell is less than Y dB and the signal quality of a
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39/79 cell of the candidate target cell is greater than Z dB, the terminal is activated to determine the cell as the cell to which transfer can be made, where X, Y and Z are positive numbers.
[00125] Optionally, the first configuration information may also include other information, for example, fifth indication information used to indicate a threshold for the number of transmission failures. In this case, when the number of transmission failures at the terminal reaches a threshold for the number of transmission failures, the terminal is activated to perform a cell determination operation to which a transfer can be made.
[00126] Optionally, the first configuration information can also include sixth indication information used to indicate a radio link failure event (radio link failure, RLF). When a radio link from the terminal fails, the terminal is triggered to perform a cell determination operation to which a transfer can be made.
[00127] It should be understood that when the first configuration information includes a plurality of indication information pieces, any configuration event in the plurality of indication information pieces can trigger the terminal to determine one of at least one candidate target cell as the cell to which transfer can be made. This is not limited in this embodiment of this patent application.
[00128] It should be understood that when the second network device determines that none of the second cell
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40/79 is allowed to access the terminal, the reply message for the second message can be used to notify the first network device of a cell recognition failure. After receiving the reply message for the second message, the first network device does not send the first message to the terminal.
[00129] S208. The first network device sends the first message to the terminal, where the first message includes first cell indication information and the first configuration information, and the first cell indication information is used to indicate at least one candidate target cell.
[00130] Correspondingly, the terminal receives the first message.
[00131] That is, after determining at least one candidate target cell and the first configuration information, the first network device can send to the terminal the first message that carries the first configuration information and the first indication information. cell.
[00132] The first cell indication information may include an identifier or an index of at least one candidate target cell. Optionally, the first cell indication information can include a list of identifiers or a list of indexes from at least one candidate target cell.
[00133] The first message can be a transfer message, to be specific, a RRC connection reconfiguration message that carries a mobility control information element (mobilityControlInfo), or it can be another message. Not that
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41/79 is limited in this embodiment of this patent application.
[00134] The terminal can determine a function of the first message based on the analyzed content of the first message. Alternatively, the first message may include indication information used to indicate a type or function of the message.
[00135] S210. After receiving the first message, the terminal can determine the cell to which transfer can be made based on the first message.
[00136] Specifically, the terminal can determine, based on the first cell indication information, one of at least one candidate target cell as the cell to which the terminal can be transferred.
[00137] An exemplary implementation of the determination, by the terminal, of the cell to which transfer can be made includes: detecting, by the terminal, if the signal quality of each candidate target cell satisfies one or more conditions indicated by the configuration information, the candidate target cell, in the first configuration information, and determine a candidate target cell that satisfies one or more conditions such as the cell to which transfer can be made.
[00138] For example, if a list of candidate target cells includes a candidate target cell 1, and the first configuration information includes 30 dB, when a difference between the signal quality of the candidate target cell 1 and the signal quality of the cell if it is greater than or equal to 30 dB, the terminal is activated to determine the candidate target cell 1 as the cell to which transfer can be made.
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42/79 [00139] If the terminal determines a plurality of cells in the candidate target cell based on the first message, the terminal can determine a cell with better signal quality as the cell to which it can be transferred.
[00140] Optionally, the first message sent by the first network device to the terminal can also include the first indication information, and the first indication information is used to indicate a transfer priority from at least one candidate target cell. The first indication information can be explicit or implicit. For example, the first cell indication information implicitly carries a transfer priority for each candidate target cell. For example, a candidate target cell that arrives first at the first cell indication information has a higher priority. Alternatively, the first indication information is linked to the first cell indication information, in other words, each candidate target cell in the first cell indication information has a corresponding transfer priority. The terminal can determine the cell to be transferred to based on the priority of the candidate target cell. Specifically, the terminal can determine sequentially, based on the first configuration information and the descending order of priorities, whether a cell in the candidate target cell can be used as the cell to which it can be transferred, until a cell to which it can be transferred. transfer is made. In this way, a transfer success rate can be increased.
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43/79 [00141] It should be noted that the priority of the candidate target cell can be indicated by a sort order in the list of identifiers or index list of the candidate target cell indicated by the first cell indication information. For example, a candidate cell with a higher ranking has a higher priority.
[00142] Optionally, the first message sent by the first network device to the terminal can also include valid time for the first message. The valid time can be used as a valid time for different information in the first message.
[00143] After the valid time or a valid period has expired, the terminal may cancel the determination operation, based on the first message, of the cell to which transfer can be made, in other words, the terminal may not determine the cell for the which can be transferred based on the first message. Specifically, the terminal can delete the first message and the various information in the first message.
[00144] Optionally, the first message sent by the first network device to the terminal can also include second configuration information. The second configuration information is used to indicate the terminal to cancel the determination operation, based on the first message, of the cell to which a transfer can be made. After receiving the second configuration information, if the terminal determines that the condition (s) informed by the second configuration information is (are) satisfied, the terminal may not determine the cell for which it can transfer to at least one candidate target cell based
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44/79 in the first message.
[00145] For example, the second configuration information can be a signal quality threshold, for example, 80 dB. In this case, when the signal quality of the serving cell is greater than 80 dB, the terminal is activated to cancel the determination operation, based on the first message, of the cell to which transfer can be made in the candidate target cell. In other words, the terminal may not determine the cell that can be transferred to the candidate target cell based on the first message.
[00146] If the reply message sent by the second network device to the first network device in step S206 includes the third configuration information, the first message sent by the first network device to the terminal can also include the third configuration information.
[00147] S212. After determining the cell to which the transfer can be made, the terminal can initiate a random access procedure for a second network device to which the cell to which the transfer can be made belongs, to access the cell to which it can be made transfer.
[00148] If the first message sent by the first network device to the terminal includes the third configuration information, the terminal can access the cell to which transfer can be made based on the third configuration information. In this way, the transfer rate of the terminal can be further increased.
[00149] Specifically, if the third information
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45/79 configuration include the temporary identifier, allocated by the second network device to the terminal, used to access the cell that is the second network device and that the terminal is allowed to access, the terminal can use the temporary identifier to access the cell to which transfer can be made. Alternatively, if the third configuration information includes information regarding the dedicated RACH preamble, allocated by the second network device to the terminal, used to access the cell that is on the second network device and that the terminal is allowed to access, the terminal you can perform the random access procedure with the cell to which a transfer can be made using the information related to the dedicated RACH preamble.
[00150] Optionally, after the terminal determines the cell to which transfer can be made, the first network device can interrupt the allocation of a sequence number to a data packet from the terminal, and send a data packet from the terminal and a sequence number status transfer, SN status transfer message to the second network device. The sequence number status transfer message may indicate to the second network device an initial count value (COUNT) used to allocate a sequence number to a downlink data packet that a sequence number has not been assigned to. still allocated (in other words, a count value from which the second network device starts allocating a sequence number to a downlink data packet from the terminal).
[00151] The terminal data package includes a package
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46/79 uplink data from the terminal or a downlink data packet to which a sequence number has been allocated, but whose successful transmission to the terminal has not been recognized.
[00152] Two exemplary implementations of sending, by the first network device, the data packet from the terminal and the sequence number status transfer message to the second network device are as follows.
[00153] In an exemplary implementation, after ending random access, the terminal can send a complete transfer message to the second network device. The complete transfer message is used to notify the second network device that the terminal has terminated access. Correspondingly, the second network device receives the complete transfer message.
[00154] After receiving the complete transfer message, the second network device can send a first request message to the first network device, to request the SN status transfer message to the terminal. Correspondingly, the first network device receives the first request message.
[00155] After receiving the first request message, the first network device interrupts the allocation of a packet data convergence protocol (PDCP) sequence number to the terminal data packet, and sends the SN status transfer message to the second network device. In addition, the first network device can also forward an uplink data packet received from the terminal to the second
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47/79 network device, and forward, to the second network device, a downlink data packet to which a PDCP sequence number has been allocated, but whose successful transmission to the terminal has not been recognized.
[00156] If the transfer request message sent by the first network device in step S204 does not carry the terminal context, after receiving the complete transfer message, the second network device can send a second request message to the first transfer device network. The second request message is used to request the terminal context. After receiving the second request message from the second network device, the first network device sends the terminal context to the second network device. The second request message and the first request message can be the same message.
[00157] In another implementation, after determining the cell to which transfer can be made, the terminal can send a first notification message to the first network device, to notify the first network device that the terminal must be transferred to the cell to which transfer can be made. The first notification message can specifically carry indication information used to indicate the cell to which a transfer can be made, for example, an identifier or an index value.
[00158] After receiving the first notification message, the first network device can interrupt the allocation of a PDCP sequence number to the terminal data packet, and send the status transfer message.
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SN to the second network device. In addition, the first network device may further forward an uplink data packet received from the terminal to the second network device, and forward, to the second network device, a downlink data packet to which a sequence number of PDCP was allocated, but the successful transmission was not recognized.
[00159] In this embodiment of this patent application, optionally, before the first network device sends the first message to the terminal, the terminal can send fourth indication information to the first network device, where the fourth indication information is used to indicate the first network device to send the first message to the terminal. Correspondingly, the sending, by the first network device, of the first message to the terminal may specifically include: sending, by the first network device, the first message to the terminal according to the fourth indication information.
[00160] In other words, the first device in network can send the first message only after an solicitation or instruction from terminal. From this mode, The
communication efficiency can be improved.
[00161] Specifically, the fourth indication information can be sent using an RRC message.
[00162] It should be noted that in this modality of this patent application, step S201 to step S206 are optional. To be specific, the communication method shown in Figure 2 may not include steps S201 to S206 or it may include only a few steps from step S201 to step
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S206.
[00163] For example, this modality of this patent application may not include steps S201 to S206. In this case, the first network device can determine at least one candidate target cell according to another method. For example, a cell adjacent to the serving cell can be determined as the candidate target cell.
[00164] For another example, this modality of this patent application may not include steps S205 and S206. In this case, after determining one or more candidate cells based on the terminal measurement report, the first network device can determine one or more candidate cells as candidate target cells. In addition, the first network device does not send the third configuration information to the terminal.
[00165] In this case, after the terminal has been successfully transferred to the cell to which it can be transferred, the complete transfer message sent to the second network device may include, for example, the C-RNTI of the source cell, or the MAC-I or PCI of the source cell.
[00166] For another example, this modality of this patent application may not include step S205. In other words, after receiving the second message, the second network device may not perform admission control. In this case, the reply message for the second message sent by the second network device neither carries the third configuration information nor the indication information of the cell that is from the second network device and that the terminal is allowed to access. In this case, the reply message can only be used to notify the first
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50/79 network device that the second network device received the second message and the information carried in the second message, for example, information regarding the context of the terminal received and stored by the second network device.
[00167] Figure 3 is a schematic flowchart of a communication method according to another modality of this patent application. It should be noted that although Figure 3 shows steps or operations of the communication method, these steps or operations are merely examples. Other operations or variations of the operations in Figure 3 can also be performed in this modality of this patent application. In addition, the steps in Figure 3 can be performed in a different order than shown in Figure 3.
[00168] Figure 3 can include step S208 in Figure 2 or some of steps S201 to S206. For brevity, technical features of the corresponding steps are not described again in this document.
[00169] S216. When it is determined that the terminal does not need to be transferred to another cell, the first network device indicates the terminal to cancel the determination operation, based on the first message, of the cell to which the transfer can be made.
[00170] For example, the first network device can send third indication information to the terminal. The third indication information is used to indicate the terminal to cancel the determination operation, based on the first message, of the cell to which a transfer can be made. In other words, the terminal may not determine the cell to which it can be made
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51/79 transfer in the candidate target cell based on the first message.
[00171] Correspondingly, after receiving the third indication information, the terminal can cancel the determination operation, based on the first message, of the cell to which it can be transferred. In other words, the terminal may not determine the cell that can be transferred to the candidate target cell based on the first message.
[00172] Optionally, the first network device can alternatively perform notification using a transfer message. For example, before the terminal determines the cell to which a transfer can be made, if the first network device sends a transfer message to the terminal, after receiving the transfer message, the terminal may not perform the determination operation, based in the first message, from the cell to which the transfer can be made, you can discard related information in the first message, and perform a corresponding operation according to the transfer command. It should be noted that the transfer message here refers to the conditional transfer in this modality of this patent application. For example, the transfer message is an RRC connection reconfiguration message that carries a mobility control information element (mobilityControlInfo). Generally, the transfer message can include an identifier or an index, a C-RNTI or a preamble to RACH, or similar to the cell to which a transfer can be made.
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52/79 [00173] Optionally, the first network device can instruct, by sending a new first message, the terminal to cancel the determination operation, based on the first previous message, of the cell to which transfer can be made. In this case, the terminal can perform a determination operation, based on the new first message, of the cell to which it can be transferred.
[00174] Optionally, the communication method shown in Figure 3 can also include step S217: the first network device sends second indication information to the second network device, where the second indication information is used to indicate the second communication device network to release a resource allocated by the second network device to the terminal and / or release the context of the terminal. In this way, the second network device can have more resources to be allocated to another terminal, so that a transfer success rate from the other terminal can be increased.
[00175] For example, if the communication method shown in Figure 3 includes step S204, and the second message sent by the first network device in step S204 carries the context of the terminal, after receiving the second indication information, the second device The network interface can release the context of the terminal according to the second indication information.
[00176] For another example, if the communication method shown in Figure 3 includes step S205, and the second network device allocates the temporary identifier and / or the RACH preamble dedicated to the terminal in step S205, after receiving the second information indication, the second
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53/79 network device can release, according to the second indication information, the temporary identifier and / or the dedicated RACH preamble allocated to the terminal.
[00177] In this embodiment of this patent application, optionally, the first network device can send the
second information from second indication device in network after to determine that the terminal no needs to be transferred to another cell • [00178] Alternatively, after cancel the operation in
determination, based on the first message, of the cell to which transfer can be made according to the third indication information sent by the first network device, the terminal sends a complete cancellation notification message to the first network device. After receiving the complete cancellation notification message sent by the terminal, the first network device sends the second indication information to the second network device. Alternatively, the first network device can send the second indication information to the second network device when sending the notification message to the terminal.
[00179] Alternatively, the first network device may indicate, by sending a new second message to the second network device, the second network device to release the information transmitted using the previous second message, or to release the temporary identifier, or dedicated RACH preamble that is allocated to the terminal based on the second previous message.
[00180] In the communication method shown in Figure 2, optionally, after the terminal receives the first message,
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54/79 but before the terminal determines and obtains the cell that can be transferred to based on the first message, the steps shown in Figure 4 can still be included.
[00181] It should be understood that the steps or operations shown in Figure 4 are merely examples. Other operations or variations of the operations in Figure 4 can also be performed in this modality of this patent application. In addition, the steps in Figure 4 can be performed in a different order than shown in Figure 4.
[00182] S218. The first network device sends an RRC reconfiguration message to the terminal. Correspondingly, the terminal receives the RRC reconfiguration message.
[00183] Specifically, after determining that the terminal needs to be reconfigured, the first network device can send the RRC reconfiguration message to the terminal.
[00184] After receiving the RRC reconfiguration message, the terminal can cancel the determination operation, based on the first message, of the cell to which a transfer can be made, in other words, the terminal may not determine, based on the first message , the cell that can be transferred to the candidate target cell indicated by the first cell indication information.
[00185] In other words, the RRC reconfiguration message can be used to indicate the terminal to cancel the determination operation, based on the first message, of the cell to which transfer can be made. Of course, the RRC reconfiguration message can also carry referral information specifically used
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55/79 to indicate the terminal to cancel the determination operation, based on the first message, of the cell to which transfer can be made.
[00186] It should be noted that if the RRC reconfiguration message instructs the terminal only to change a configuration of the source cell, the terminal may not cancel the determination operation, based on the first message, of the cell to which a transfer can be made. , but only reconfigure the source cell, and the configuration information of the candidate target cell remains unchanged.
[00187] S220. After completing the reconfiguration according to the RRC reconfiguration message, the terminal can send a complete reconfiguration message to the first network device. Correspondingly, the first
device network receives the message complete in reconfiguration. [00188] After will receive message complete in reconfiguration, the first device network can
determine at least one new candidate target cell, and send a new first message to the terminal. The new first message can include new first indication information and new first configuration information. The new first indication information is used to indicate at least one new candidate target cell. The new first message also includes other technical resources that can be included in the first previous message. For brevity, details are not described again in this document.
[00189] After receiving the new first message, the terminal can execute step S210 based on the new first message.
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56/79 [00190] In addition, after receiving the complete reconfiguration message, the first network device can send a new transfer request message to the second network device. The new transfer request message may include a new terminal context. The second network device can update the context originally stored to the new context. Alternatively, the second network device can release the resource previously allocated to the terminal, for example, the temporary identifier or the dedicated RACH preamble, and allocate a new resource to the terminal, for example, a new temporary identifier or a new RACH preamble. dedicated. A new transfer message may include other technical resources that may be included in the previous transfer message. For brevity, details are not described again in this document.
[00191] In the communication method shown in Figure 4, optionally, before or after sending the RRC reconfiguration message to the terminal, the first network device can perform step S217, in other words, the first network device can send second indication information to the second network device. The second indication information is used to indicate the second network device to release the terminal context that is received by the second network device before step S217, or used to indicate the second network device to release the resource that is allocated to the terminal by the second network device before step S217, for example, the temporary identifier or the dedicated RACH preamble.
[00192] In other words, in this implementation, after
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57/79 receive the second indication information, the second network device can release the context previously received from the terminal, or release the resource previously allocated to the terminal. After the first network device sends a new second message, the second network device can directly store a terminal context in the new second message, or directly allocate a resource to the terminal.
[00193] After reconfiguring the terminal, the first network device can use a delta signaling mode, in other words, send only an updated part of a configuration to the second network device, or it can use a complete configuration mode, in other words, send a complete updated configuration to the second network device, to update the terminal context on the second network device.
[00194] Optionally, when the second message sent by the first network device to the second network device includes the indication information used to indicate the second cell of the second network device, the second message can also include a measurement result and an identifier one or more cells from another network device. After receiving the second message, the second network device can guarantee, based on the cell measurement result of the other network device, that the terminal can perform a dual connectivity (DC) procedure with the second network device and the other network device after the terminal is transferred to the second network device. The other network device can be understood as a secondary network device.
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58/79 [00195] In this case, the second network device can perform a procedure to add a secondary network device with the secondary network device, to exchange a DC configuration. Specifically, the secondary network device generates DC configuration information and sends the DC configuration information to the second network device. Then the second network device can carry the DC configuration information in the reply message to the second message. Finally, the first network device can carry the DC configuration information in the first message.
[00196] In a possible implementation, to implement an interruption of zero milliseconds in a transfer process, the transfer command or the first message in this modality of this patent application can carry indication information used to indicate that in the transfer process, the terminal needs to implement zero millisecond interruption, or maintain data transmission with the first network device until the transfer has ended or until an indication from a network device is received. After receiving the indication, the terminal can establish a protocol stack shown in Figure 5 or Figure 6.
[00197] As shown in Figure 5, the terminal establishes a medium access control entity (MAC), a radio link control entity (radio link control, RLC), and a protocol sub-entity. packet data convergence protocol, PDCP, which correspond to each source cell and target cell (in other words, the cell
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59/79 to which transfer can be made in the previous mode). The PDCP subentity is used for data encryption / decryption and integrity protection. However, the terminal establishes only a PDCP reordering sub-entity used to allocate an SN number to a data packet to sequentially deliver PDCP packets, in other words, to ensure that data packets are sequentially sent and reordered.
[00198] As shown in Figure 6, the terminal establishes a MAC entity and an RLC entity that correspond to each of the source cell and a target cell, but establishes only one PDCP entity for data encryption / decryption, integrity protection and SN number allocation for sequential delivery. The terminal can store two security keys (corresponding to the source cell and the target cell). The terminal uses a correct key to perform data encryption / decryption and integrity protection in a corresponding cell. For example, the terminal uses a key corresponding to the source cell for transmitting data in the source cell, and uses a key corresponding to the target cell for transmitting data in the target cell.
[00199] Optionally, after receiving the first message or the transfer message, the terminal can start a timer. The timer can be specified by a protocol, pre-configured by the terminal, or indicated by the first message or the transfer message. After the timer expires, the terminal can release a stack of protocols from the source cell. To be specific, the terminal
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60/79 can release the entities in the source cell's protocol stack.
[00200] Alternatively, the terminal may release the source cell's protocol stack after the transfer has finished, for example, releasing the source cell's protocol stack after sending the complete transfer message.
[00201] Alternatively, the terminal releases the source cell protocol stack only when the terminal is instructed to do this by one side of the network. For example, if the first network device determines that the data that needs to be transmitted in the source cell is all transmitted or that the source cell is no longer used for data transmission, the first network device can send an indication message to the terminal . After receiving the indication message, the terminal can release the protocol stack from the source cell. For another example, after receiving the complete transfer message from the terminal, the second network device can send an indication message to the terminal. After receiving the indication message, the terminal releases the protocol cell from the source cell.
[00202] When the terminal's protocol stack is like the one shown in Figure 5, after the terminal releases the source cell's protocol stack, a terminal's protocol stack is shown in Figure 7. When the terminal's protocol stack is like the one shown in Figure 6, after the terminal releases the protocol stack from the source cell, a protocol stack from the terminal is shown in Figure 8.
[00203] Optionally, the first network device can carry indication information in the message
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61/79 transfer request or in the second message, and the indication information is used to indicate the second network device that zero millisecond interruption needs to be implemented in the terminal transfer process. A protocol stack on the network side in the transfer process is shown in Figure 9. Both a source cell protocol stack that belongs to the first network device and a target cell protocol stack that belongs to the second network device include a PDCP entity, an RLC entity and a MAC entity.
[00204] It can be learned from Figure 9 that the source cell and the target cell have respective independent PDCP entities used to implement data encryption / decryption, integrity protection and sequential delivery. In the transfer process, a PDCP layer from the source cell notifies a PDCP layer from the target cell of an SN number from which a number allocated to a data packet to be transmitted in the target cell begins.
[00205] The first network device releases the protocol cell of the source cell, and the protocol cell of the target cell of the second network device remains unchanged.
[00206] Figure 10 is a schematic structural diagram of a network device according to an embodiment of this patent application. The network device can implement the functions of the first network device in the modalities of Figure 2 to Figure 4. It should be understood that a network device 1000 shown in Figure 10 is merely an example. The network device in this embodiment of this patent application may also include another module or unit, or may include modules with functions similar to those of the modules in
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62/79
Figure 10, or you may not include all modules in Figure 10.
[00207] A 1010 processing module is configured to determine at least one candidate target cell and first configuration information, where the first configuration information is used to trigger a terminal to determine one of at least one candidate target cell as the cell for which can be transferred, and the network device is a network device to which a serving cell currently accessed by the terminal belongs.
[00208] A 1020 communications module is configured to send a first message to the terminal, where the first message includes the first cell indication information and the first configuration information, and the first cell indication information is used to indicate the action. least one candidate target cell.
[00209] The network device sends the first cell indication information and the first configuration information to the terminal, so that the terminal can determine, based on the first configuration information, if the terminal needs to be transferred to the candidate target cell indicated by the first cell indication information, and determines a cell that is at least one candidate target cell to which the terminal needs to be transferred. The terminal can then be transferred to the cell. In this way, even if the terminal moves fast or there is an obstacle between the terminal and the source base station, the terminal can still be transferred to a target cell, so that a transfer rate of the terminal can be increased and the terminal communication quality
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63/79 is improved.
[00210] Optionally, if the first message still includes at least one of the following information: valid time of the first message, first indication information, or second configuration information, the first indication information is used to indicate an action transfer priority. at least one candidate target cell, and the second configuration information is used by the terminal to cancel the determination operation, based on the first message, of the cell to which a transfer can be made.
[00211] Optionally, the communications module is further configured to send a second message to a second network device, where the second message includes information indicating a second cell that belongs to the second network device. The communications module is further configured to receive a response message for the second message, where the response message for the second message includes information indicating a cell that is from the second cell and that the terminal is allowed to access. The processing module is specifically configured to determine at least one candidate target cell based on the indication information of the cell that is from the second cell and that the terminal is allowed to access.
[00212] Optionally, the second message also includes a terminal context.
[00213] Optionally, the response message also includes valid context time.
[00214] Optionally, the reply message for the
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the second message also includes third configuration information, the third configuration information includes at least one of the following information: a first temporary identifier or information regarding a first dedicated RACH random access channel preamble, and the first temporary identifier and information concerning to the first dedicated RACH preamble are used by the terminal to access all or some cells that are from the second cell and that the terminal is allowed to access; and the first message also includes the third configuration information.
[00215] Optionally, the communications module is further configured to send second indication information to the second network device, where the second indication information is used to indicate the second network device to release an allocated resource, based on the second message, by the second network device to the terminal.
[00216] Optionally, the communications module is further configured to send third indication information to the terminal, where the third indication information is used to indicate the terminal to cancel the determination operation, based on the first message, of the cell for which transfer can be made.
[00217] Optionally, the communications module is further configured to receive fourth indication information sent by the terminal, where the fourth indication information is used to indicate the first network device to send the first message to the terminal; and the communications module is specifically configured to send the first message to the terminal according to the fourth
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65/79 indication information.
[00218] Optionally, the communications module is also configured to receive a first notification message sent by the terminal, where the first notification message carries information indicating the cell to which transfer can be made; and the communications module is further configured to send, based on the first notification message, data from the terminal and a sequence number status transfer message to a network device to which the cell to which the transfer can be made belongs.
[00219] Optionally, the first configuration information includes at least one of the following information: signal quality threshold information, fifth indication information, or sixth indication information, where the signal quality threshold information is used to trigger the terminal to determine the cell to which transfer can be made when a difference between the signal quality of the serving cell and the signal quality of a cell of at least one candidate target cell is greater than or equal to a threshold of difference of signal quality, or when the signal quality of the serving cell is less than a first signal quality threshold and the signal quality of a cell of at least one candidate target cell is greater than or equal to a second signal quality threshold signal; the fifth indication information is used to indicate transmission fault quantity threshold information, and transmission fault quantity threshold information is used to trigger, after a terminal transmission fault quantity reaches a threshold of
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66/79 number of transmission failures, the terminal executing the operation to determine the cell to which transfer can be made; and the sixth indication information is used to indicate a radio link failure event, and the radio link failure event is used to trigger, after a radio link from the terminal fails, the terminal to perform the determination operation cell to which transfer can be made.
[00220] It should be understood that for details regarding the previous operations and / or functions or other operations and / or functions of the network device modules in this modality of this patent application in Figure 10, make additional reference to a corresponding procedure performed by the first network device in each of the modalities from Figure 2 to Figure 4. For brevity, details are not described again in this document.
[00221] Figure 11 is a schematic structural diagram of a terminal according to an embodiment of this patent application. The terminal is configured to implement the functions of the terminal in the modalities of Figure 2 to Figure 4. It should be understood that a terminal 1100 shown in Figure 11 is merely an example. The terminal in this embodiment of this patent application may also include another module or unit, or may include modules with functions similar to those of the modules in Figure 11, or may not include all modules in Figure 11.
[00222] A communications module 1110 is configured to receive a first message sent by a first network device, where the first message includes first cell indication information and first transmission information.
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67/79 configuration, the first cell indication information is used to indicate at least one candidate target cell, and first configuration information is used to trigger the terminal to determine a cell from at least one candidate target cell as the cell for the which transfer can be made, and the first network device is a network device to which a cell serving currently accessed by the terminal belongs.
[00223] An 1120 processing module is configured to determine the cell to which transfer can be made in at least one candidate target cell based on the first message.
[00224] The terminal receives the first cell indication information and the first configuration information sent by the first network device, determines, based on the first configuration information, whether the terminal needs to be transferred to the candidate target cell indicated by first cell indication information, and determines a cell that is at least one candidate target cell and to which the terminal needs to be transferred. The terminal can then be transferred to the cell. In this way, even if the terminal moves fast or there is an obstacle between the terminal and the source base station affecting the signal quality between the terminal and the source base station, the terminal can still be transferred to a target cell, so that the transfer rate of the terminal can be increased and the communication quality of the terminal is improved.
[00225] Optionally, the first message also includes at least one of the following information: valid time of the
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68/79 first message, first indication information, or second configuration information, the first indication information is used to indicate a transfer priority from at least one candidate target cell, and the second configuration information is used by the terminal to cancel a determination operation, based on the first message, of the cell to which transfer can be made.
[00226] Optionally, the first message also includes third configuration information, the third configuration information includes at least one of the following information: a first temporary identifier or information regarding a first dedicated RACH random access channel preamble, and the first temporary identifier and information regarding the first dedicated RACH preamble are used by the terminal to access a cell that is from a second cell that belongs to a second network device and that the terminal is allowed to access.
[00227] Optionally, the communications module is further configured to receive third indication information sent by the first network device, where the third indication information is used to indicate the terminal to cancel the determination operation, based on the first message, of the cell to which transfer can be made.
[00228] Optionally, the communications module is further configured to send fourth indication information to the first network device, where the fourth indication information is used to indicate the first indication device.
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69/79 network to send the first message to the terminal; and the communications module is specifically configured to receive the first message that is sent by the first network device according to the fourth indication information.
[00229] Optionally, the communications module is further configured to send a first notification message to the first network device, where the first notification message carries information indicating the cell to which transfer can be made, so that the first network device sends, based on the first notification message, terminal data and a sequence number status transfer message to a network device to which the cell that can be transferred belongs to.
[00230] Optionally, the first configuration information includes one of the following information: signal quality threshold information, fifth indication information, or sixth indication information, where the signal quality threshold information is used to drive the terminal to determine the cell to which transfer can be made when a difference between the signal quality of the serving cell and the signal quality of a cell of at least one candidate target cell is greater than or equal to a threshold of quality difference of signal, or when the signal quality of the serving cell is less than a first signal quality threshold and the signal quality of a cell of at least one candidate target cell is greater than or equal to a second signal quality threshold; the fifth indication information is used to indicate threshold information on the number of transmission failures,
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70/79 and the transmission fault threshold information is used to trigger, after a terminal transmission fault number reaches a transmission fault threshold threshold, the terminal to perform the cell determination operation for the which transfer can be made; and the sixth indication information is used to indicate a radio link failure event, and the radio link failure event is used to trigger, after a radio link from the terminal fails, the terminal to perform the determination operation cell to which transfer can be made.
[00231] It should be understood that for details regarding the previous operations and / or functions or other operations and / or functions of the terminal units in this modality of this patent application in Figure 11, make additional reference to a corresponding procedure performed by the terminal in each one of the modalities from Figure 2 to Figure 4. For brevity, details are not described again in this document.
[00232] Figure 12 is a schematic structural diagram of a network device according to another embodiment of this patent application. The network device is configured to implement the functions of the first network device in the modalities of Figure 2 to Figure 4. It should be understood that a network device 1200 shown in Figure 12 is merely an example. The network device in this embodiment of this patent application may also include another module or unit, or may include modules with functions similar to those of the modules in Figure 12, or may not include all modules in Figure 12.
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71/79 [00233] A processor 1210 can be configured to implement the operations or steps that can be implemented by the processing module 1010 in Figure 10. A transmitter 1220 can be configured to implement some operations or steps that can be implemented by the module 1020 communications in Figure 10. A 1230 receiver can be configured to implement some operations or steps that can be implemented by the 1020 communications module in Figure 10. For brevity, details are not described again in this document. It should be understood that transmitter 1220 and receiver 1230 can exist independently or can be integrated.
[00234] Optionally, the network device 1200 can also include a memory. The memory is configured to store data and / or an instruction. The 1210 processor can invoke the instruction in memory to implement a corresponding method. The memory can exist independently, or it can be integrated with other functional units. This is not limited in this embodiment of this patent application.
[00235] Figure 13 is a schematic structural diagram of a terminal according to another embodiment of this patent application. The terminal is configured to implement the functions of the terminal in the modalities of Figure 2 to Figure 4. It should be understood that a terminal 1300 shown in Figure 13 is merely an example. The terminal in this embodiment of this patent application may also include another module or unit, or may include modules with functions similar to those of the modules in Figure 13, or may not include all modules in Figure 13.
[00236] A 1310 processor can be configured to
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72/79 implement the operations or steps that can be implemented by the 1120 processing module in Figure 11. A 1320 receiver can be configured to implement some operations or steps that can be implemented by the 1110 communications module in Figure 11. A 1330 transmitter can be configured to implement some operations or steps that can be implemented by the 1110 communications module in Figure 11. For brevity, details are not described again in this document. It is to be understood that transmitter 1330 and receiver 1320 may exist independently or may be integrated.
[00237] Optionally, terminal 1300 can also include a memory. The memory is configured to store data and / or an instruction. The 1310 processor can invoke the instruction in memory to implement a corresponding method. The memory can exist independently, or it can be integrated with other functional units. This is not limited in this embodiment of this patent application.
[00238] Figure 14 is a schematic structural diagram of a network device according to another embodiment of this patent application. The network device is configured to implement the functions of the second network device in the modalities of Figure 2 to Figure 4. It should be understood that a network device 1400 shown in Figure 14 is merely an example. The network device in this embodiment of this patent application may also include another module or unit, or may include modules with functions similar to those of the modules in Figure 14, or may not include all modules in Figure 14.
[00239] A 1420 receiver can be configured to
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73/79 receiving a second message sent by a first network device, where the second message includes a terminal context and valid time of the context. A 1430 transmitter can be configured to send a response message for the second message to the first network device. If the second message includes indication information for a second cell from the network device 1400, a processor 1410 can be configured to determine a cell that is of the second cell and that the terminal is allowed to access. In addition, the reply message for the second message may include indication information used to indicate the cell that the network device 1400 allows the terminal to access.
[00240] Optionally, the 1410 processor can also be configured to allocate, to the terminal, a temporary identifier or a dedicated RACH preamble that is used to access each of the cells that the 1400 network device allows the terminal to access. In this case, the reply message for the second message may also include the temporary identifier or information regarding the dedicated RACH preamble.
[00241] Optionally, the receiver 1420 can be further configured to receive second indication information sent by the first network device, where the second indication information is used to indicate the network device 1400 to release the context of the terminal. In this case, the processor 1410 can also be configured to release the context of the terminal according to the second indication information.
[00242] Optionally, if the 1400 network device
Petition 870190112659, of 11/04/2019, p. 85/91 allocate the temporary identifier or the RACH preamble dedicated to the terminal, the 1410 processor can also be configured to release the temporary identifier or the dedicated RACH preamble according to the second indication information.
[00243] Optionally, processor 1410 can also be configured to update the terminal context based on a new second message, or update the temporary identifier or dedicated RACH preamble allocated to the terminal.
[00244] Processor 1410, receiver 1420 and transmitter 1430 are configured to implement operations or corresponding steps implemented by the second network device in the modalities in Figure 2 to Figure 4. For brevity, details are not described again in this document. It is to be understood that transmitter 1430 and receiver 1420 may exist independently or may be integrated.
[00245] Optionally, the network device 1400 can also include a memory. The memory is configured to store data and / or an instruction. The processor 1410 can invoke the instruction in memory to implement a corresponding method. The memory can exist independently, or it can be integrated with other functional units. This is not limited in this embodiment of this patent application.
[00246] This patent application also provides a terminal. The terminal is configured to implement the functions of the terminal in the modalities of Figure 5 to Figure 9. The terminal can include a memory and a processor. The memory is configured to store code, and the processor is
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75/79 configured to execute code in memory. The processor and memory can exist independently, or they can be integrated together.
[00247] In addition, the terminal can also include a receiver and a transmitter. The receiver and transmitter are configured to communicate with another device. The receiver and transmitter can be integrated into a transceiver.
[00248] This patent application also provides a network device. The network device is configured to implement the functions of the first network device in the modalities of Figure 5 to Figure 9. The network device can include a memory and a processor. The memory is configured to store code, and the processor is configured to execute code in memory. The processor and memory can exist independently, or they can be integrated together.
[00249] In addition, the network device may also include a receiver and a transmitter. The receiver and transmitter are configured to communicate with another device. The receiver and transmitter can be integrated into a transceiver.
[00250] This patent application also provides a network device. The network device is configured to implement the functions of the second network device in the modalities of Figure 5 to Figure 9. The network device can include a memory and a processor. The memory is configured to store code, and the processor is configured to execute code in memory. The processor and memory can exist independently, or they can be
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integrated together.
[00251] In addition, the network device may also include a receiver and a transmitter. The receiver and transmitter are configured to communicate with another device. The receiver and transmitter can be integrated into a transceiver.
[00252] A person skilled in the art may be aware that the units and steps of algorithms in the examples described with reference to the modalities disclosed in this specification can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are performed by hardware or software depends on specific applications and design restrictions of technical solutions. A person skilled in the art can use a different method to implement the functions described for each specific application, but the implementation should not be considered to go beyond the scope of this patent application.
[00253] It should be clearly understood by a person versed in the technique that for the purposes of convenience and brief description, for details referring to a detailed work process of the system, apparatus and unit, refer to a corresponding process in the method modalities. Details are not described again in this document.
[00254] In the various modalities provided in this patent application, it should be understood that the revealed system, apparatus and method can be implemented in other ways. For example, the types of apparatus described are merely examples. For example, the division of units is merely a functional logical division and can be another division
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77/79 in real implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not implemented. In addition, mutual couplings or direct couplings or communication connections displayed or discussed can be implemented using some interfaces. Indirect couplings or communication connections between devices or units can be implemented in electrical, mechanical or other ways.
[00255] The units described as separate parts may or may not be physically separate. Parts displayed as units may or may not be physical units, and they may be located in one position, or they may be distributed over a plurality of network units. Some or all of the units can be selected based on real requirements to achieve the objectives of the modalities solutions.
[00256] In addition, functional units in the modalities of this patent application can be integrated into a processing unit, or each of the units can exist physically isolated, or two or more units can be integrated into one unit.
[00257] All or some of the above mentioned modalities can be implemented by software, hardware, firmware, or any combination of these. When software is used to implement the modalities, some or all of the modalities can be implemented in a form of a computer program product. The computer program product includes one or more computer instructions. When computer program instructions are loaded and executed on a computer, some or all of the
Petition 870190112659, of 11/04/2019, p. 89/91
78/79 procedures or functions according to the modalities of the present invention are generated. The computer can be a general purpose computer, a dedicated computer, a computer network, or other programmable devices. Computer instructions can be stored on a computer-readable storage medium or they can be transmitted from a computer-readable storage medium to another computer-readable storage medium. For example, computer instructions can be transmitted from one Internet site, computer, server, or data center to another Internet site, computer, server, or data center in a wired mode (for example, a coaxial cable, an optical fiber, or a digital subscriber line (DSL)) or wireless (for example, infrared, radio, or microwave). The computer-readable storage medium can be any usable medium accessible by a computer, or a data storage device, for example, a server or a data center that integrates one or more usable media. The usable medium can be a magnetic medium (for example, a floppy disk, a hard disk, or a magnetic tape), an optical medium (for example, a DVD), a semiconductor medium (for example, a solid state disk ( Solid State Disk, SSD)), or similar.
[00258] The above descriptions are merely specific implementations of this patent application and are not intended to limit the scope of protection of this patent application. Any variation or substitution easily discovered by a person skilled in the art within the technical scope disclosed in this patent application must fall within the scope
Petition 870190112659, of 11/04/2019, p. 90/91 protection of this patent application. Therefore, the scope of protection of this patent application must be subject to the scope of protection of the claims.

权利要求:
Claims (23)
[1]
1. Communication method, characterized by the fact that it comprises:
determining, by a first network device, at least one candidate target cell and first configuration information, where the first configuration information is used to trigger a terminal to determine one of at least one candidate target cell as a cell to be transferred -for, and the first network device is a network device to which a cell currently serving accessed by the terminal belongs; and sending, by the first network device, a first message to the terminal, where the first message comprises the first cell indication information and the first configuration information, and the first cell indication information is used to indicate the hair. least one candidate target cell.
[2]
2. Communication method, according to claim 1, characterized by the fact that the first message also comprises at least one of the following information: valid time of the first message, first indication information or second configuration information, the first information of The indication is used to indicate a transfer priority of at least one candidate target cell, and the second configuration information is used by the terminal to cancel a determination operation, based on the first message, of the cell to be transferred to.
[3]
3. Communication method, according to claim 1 or 2, characterized by the fact that the communication method
Petition 870190095248, of 9/24/2019, p. 15/31
2/9 communication also includes:
sending, by the first network device, a second message to a second network device, wherein the second message comprises information indicating a second cell belonging to the second network device; and receiving, by the first network device, a reply message for the second message, wherein the reply message for the second message comprises information indicating a cell that is of the second cell and that the terminal is allowed to access, and the determination, by a first network device, of at least one candidate target cell comprises:
determine, by the first network device, at least one candidate target cell based on the indication information of the cell that is from the second cell and that the terminal is allowed to access.
[4]
4. Communication method, according to the claim
3, characterized by the fact that the second message also comprises a terminal context.
[5]
5. Communication method, according to the claim
4, characterized by the fact that the second message still comprises a valid time of the context.
[6]
Communication method according to any one of claims 3 to 5, characterized in that the reply message for the second message further comprises third configuration information, the third configuration information comprises at least one of the following information: a first temporary identifier or information about a first random access preamble
Petition 870190095248, of 9/24/2019, p. 16/31
3/9
Dedicated RACH, and the first temporary identifier and information about the first dedicated RACH preamble are used by the terminal to access all or some cells that are from the second cell and that the terminal is allowed to access; and the first message further comprises the third configuration information.
[7]
7. Communication method according to any of claims 3 to 6, characterized by the fact that the communication method further comprises:
send, through the first network device, second indication information to the second network device, where the second indication information is used to indicate the second network device to release an allocated resource, based on the second message, by the second device connection to the terminal.
[8]
8. Communication method according to any of claims 1 to 7, characterized by the fact that the communication method further comprises:
send, by the first network device, third indication information to the terminal, where the third indication information is used to indicate the terminal to cancel the operation of determining, based on the first message, the cell to be transferred for.
[9]
9. Communication method according to any one of claims 1 to 8, characterized by the fact that the communication method further comprises:
receive, by the first network device, fourth indication information sent by the terminal, where the fourth indication information is used to indicate the
Petition 870190095248, of 9/24/2019, p. 17/31
4/9 the first network device to send the first message to the terminal, and the sending, by the first network device, of a first message to the terminal comprises:
send, by the first network device, the first message to the terminal according to the fourth indication information.
[10]
10. Method of communication according to any one of claims 1 to 9, characterized by the fact that the method of communication further comprises:
receiving, by the first network device, a first notification message sent by the terminal, in which the first notification message carries indication information from the cell to be-transferred-to; and sending, via the first network device based on the first notification message, data from the terminal and a sequence number status transfer message to a network device to which the cell to-be transferred-to belongs.
[11]
Communication method according to any one of claims 1 to 10, characterized in that the first configuration information comprises at least one of the following information: signal quality threshold information, fifth indication information or sixth information of indication, in which the signal quality threshold information is used to drive the terminal to determine the cell to be transferred when the difference between the signal quality of the serving cell and the signal quality of a hair cell least one candidate target cell is greater than or equal to
Petition 870190095248, of 9/24/2019, p. 18/31
5/9 equal to a signal quality difference threshold, or when the signal quality of the serving cell is less than a first signal quality threshold and the signal quality of a cell of at least one candidate target cell is higher or equal to a second signal quality threshold;
the fifth indication information is used to indicate transmission fault quantity threshold information, and transmission fault quantity threshold information is used to trigger, after a terminal transmission fault quantity reaches a quantity fault threshold. transmission failures, the terminal to perform the operation of determining the cell to be transferred to; and the sixth indication information is used to indicate a radio link failure event, and the radio link failure event is used to trigger, after a radio link from the terminal fails, the terminal to perform the determine operation the cell to-be-transferred-to.
[12]
12. Communication method, characterized by the fact that it comprises:
receive, by a terminal, a first message sent by a first network device, where the first message comprises the first cell indication information and the first configuration information, the first cell indication information is used to indicate at least one candidate target cell, the first configuration information is used to trigger the terminal to determine one of at least one candidate target cell as a cell to be transferred to and the first network device is a network device to which a cell serving currently accessed by the terminal belongs to; and
Petition 870190095248, of 9/24/2019, p. 19/31
6/9 determine, by the terminal, the cell to be transferred to at least one candidate target cell based on the first message.
[13]
13. Communication method, according to claim 12, characterized by the fact that the first message also comprises at least one of the following information: valid time of the first message, first indication information and second configuration information, the first information of The indication is used to indicate a transfer priority of at least one candidate target cell, and the second configuration information is used by the terminal to cancel a determination operation, based on the first message, of the cell to be transferred to.
[14]
14. Communication method according to claim 12 or 13, characterized in that the first message further comprises third configuration information, the third configuration information comprises at least one of the following information: a first temporary identifier and information about a first dedicated RACH random access preamble, and the first temporary identifier and information about the first dedicated RACH preamble are used by the terminal to access a cell that is from a second cell belonging to a second network device and that the terminal has permission to access.
[15]
15. Communication method according to any one of claims 12 to 14, characterized by the fact that the communication method further comprises:
receive, through the terminal, third indication information
Petition 870190095248, of 9/24/2019, p. 20/31
7/9 sent by the first network device, in which the third indication information is used to indicate the terminal to cancel the operation of determining, based on the first message, the cell to-be-transferred-to.
[16]
16. Communication method according to any of claims 12 to 15, characterized by the fact that the communication method further comprises:
send, through the terminal, fourth indication information to the first network device, where the fourth indication information is used to indicate the first network device to send the first message to the terminal, and the reception, by a terminal, of a first message sent by a first network device comprises:
receive, by the terminal, the first message that is sent by the first network device according to the fourth indication information.
[17]
17. Communication method according to any of claims 12 to 16, characterized by the fact that the communication method further comprises:
send, through the terminal, a first notification message to the first network device, where the first notification message carries indication information from the cell to be transferred, so that the first network device sends, based on in the first notification message, terminal data and a sequence number status transfer message to a network device to which the cell to-be-transferred-to belongs.
[18]
18. Communication method, according to any one
Petition 870190095248, of 9/24/2019, p. 21/31
8/9 of claims 12 to 17, characterized in that the first configuration information comprises at least one of the following information: signal quality threshold information, fifth indication information or sixth indication information, in which the information of signal quality threshold is used to trigger the terminal to determine the cell to be transferred-to when the difference between the signal quality of the serving cell and the signal quality of a cell of at least one candidate target cell is greater than or equal to a signal quality difference threshold, or when the signal quality of the serving cell is less than a first signal quality threshold and the signal quality of a cell of at least one candidate target cell is greater than or equal to a second signal quality threshold;
the fifth indication information is used to indicate the transmission fault quantity threshold information, and the transmission fault quantity threshold information is used to trigger, after a terminal transmission fault quantity reaches a quantity fault threshold. transmission failures, the terminal to perform the operation of determining the cell to be transferred to; and the sixth indication information is used to indicate a radio link failure event, and the radio link failure event is used to trigger, after a radio link from the terminal fails, the terminal to perform the determine operation the cell to-be-transferred-to.
[19]
19. Network device, characterized by the fact that the network device is configured to implement the communication method according to any of the claims
Petition 870190095248, of 9/24/2019, p. 22/31
9/9
1 to 11.
[20]
20. Terminal, characterized by the fact that the terminal is configured to implement the communication method as defined in any of claims 12 to 18.
[21]
21. Computer-readable storage medium, characterized by the fact that the computer-readable storage medium stores the program code for execution by a network device, and the program code comprises an instruction used to execute the method of
compliant communication defined in any of the claims 1 to 11. 22. Middle in storage readable by computer, featured fur f at what the middle of storage computer readable stores the code program for
execution by a terminal, and the program code comprises an instruction used to execute the communication method as defined in any one of claims 12 to 18.
[22]
23. Communication device, characterized by the fact that the communication device is configured to implement the communication method as defined in any of claims 1 to 18.
[23]
24. Computer program, characterized by the fact that when the computer program is executed on a communication device, the communication device executes the communication method as defined in any one of claims 1 to 18.

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法律状态:
2021-10-19| B350| Update of information on the portal [chapter 15.35 patent gazette]|

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