• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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    • 专利摘要:
    An efficient channel switching procedure is provided for a mobile communication system. The first channel is set up to support connection with a mobile station through a radio access network. Next, even though the first channel is no longer used to support this connection, a portion of this first channel is maintained for some time period. In this manner, if the first channel is needed again to support connection with the mobile station, the retained portion of the first channel is simply reactivated to reduce channel switching costs and delays associated with channel establishment and recovery operations. Another part of the first channel, for example corresponding to a radio channel resource, that supports a connection between a radio access network and a mobile station may be used for another mobile station connection after the first channel is no longer used to support the connection. It can be recovered to make it possible. In one embodiment, the first channel corresponds to a dedicated type of channel reserved for connection with a mobile station and the connection is not reserved for a particular mobile station, i.e., a second channel corresponding to a common channel shared by multiple mobile stations. Switch to channel of type. In another embodiment, the first channel is one of a plurality of channels established between the mobile station and the radio access network in accordance with the handover operation. The present invention switches this connection quickly and efficiently back from the common channel to the dedicated channel (first embodiment) and to a cell that previously supports this connection (second embodiment).
    公开号:KR20010108485A
    申请号:KR1020017012895
    申请日:2000-03-21
    公开日:2001-12-07
    发明作者:빌라르스페르한스아케
    申请人:클라스 노린, 쿨트 헬스트룀；텔레폰악티에볼라겟엘엠에릭슨(펍)；
    IPC主号:
    专利说明:

    Efficient HANDLING OF CONNECTIONS IN A MOBILE COMMUNICATIONS NETWORK}
    [2] Currently, mobile telecommunications networks are typically designed to function in conjunction with public switched telephone networks (PSTNs) and integrated telecommunications networks (ISDNs). Both of these networks are circuit switched networks and handle relatively narrow bandwidth traffic. But. Packet-switched networks such as the Internet handle much wider bandwidth traffic. While wired communication terminals, such as personal computers, may use wider packet switched network bandwidth, wireless mobile wireless terminals have significant disadvantages due to the relatively limited bandwidth of the wireless / public interface that separates the mobile terminal from the packet switched network. In a global system for second generation mobile telecommunications (GSM) mobile communication systems, General Packet Radio Service (GPRS) provides "bursty" traffic such as the transmission of infrequent email messages, Internet information, and other data. Introduced to process. Because GPRS is a packet-switched service, it only requires radio channel resources when it is actually transmitted, compared to the typically less efficient circuit-switched service reserved for mobile station users regardless of whether the data is actually transmitted. GPRS packet-switched services allow the radio frequency spectrum to be allocated more efficiently across voice and data calls and allow channels to be shared simultaneously among multiple users.
    [3] Although GSM provides mobile station users with both circuit switched and packet switched services, GSM and other second generation mobile communication systems still suffer from narrow wireless bandwidth. There is a need for wireless access that provides very high data rates and supports enhanced bearer services that cannot be achieved with existing generations of mobile communication systems. A third generation mobile system based on wideband code division multiple access (W-CDMA) wireless access has been introduced. Unlike narrowband access methods such as frequency division multiple access (FDMA) and time division multiple access (TDMA), and somewhat "standardized" CDMA, W-CDMA currently supports bandwidths from 5 MHz to 15 MHz, with much greater bandwidth in the future. It is expected to do. In addition to optical bandwidth, W-CDMA also provides robust operation in fading environments by providing robust operation and transparent handover between base stations (soft handover) and between base station sectors (softer handover). Improve quality. In contrast to narrowband mobile communication systems, where fading substantially degrades signal quality, multipath fading is useful for improving the received signal quality, i.e., a RAKE receiver and improved signal processing techniques.
    [4] Another limitation with the current GSM system is basically another type of network service node, such as a circuit switched service and a GPRS node, through two specific categories of service, namely, one type of network service node such as a mobile switching center (MSC). It provides a packet switched service provided through. There is one set of channels for circuit switched services and another set of channels for packet switched channels. Often, the flexibility to mix and match specific services to meet the changing needs of mobile subscribers is not great. In contrast, W-CDMA systems provide a wide variety of services and allow for flexible resource allocation and delivery of requested services. In practice, a single set of channels is used to support circuit switched and packet switched services. After the current need for a particular service is analyzed, existing communication resources are allocated flexibly and dynamically, taking into account the system's current requirements for communication resources.
    [5] As an example of the third generation, W-CDMA, called Universal Mobile Telecommunications System (UMTS), is shown in FIG. The UMTS 10 has a representative connection oriented external core network, shown in cloud form 12, which may be, for example, a PSTN or ISDN network. An exemplary connectionless external core network shown in cloud 14 may be, for example, the Internet. Both core networks are coupled to the corresponding service node 16. The core network 12 is connected to a connection oriented service node, shown as mobile switching room node 18, which provides circuit switched services. In the existing GSM model, mobile switching room 18 is connected to base station system (BSS) 22 via interface A, which is then connected to wireless base station 23 via interface Abis. The internet connectionless network 14 is connected to a GPRS node 20 that is matched for providing packet switched services. Each of the core network services 18 and 20 connects to a UMTS terrestrial radio access network (UTRAN) 24 via a radio access network (RAN) interface. The UTRAN 24 has a plurality of radio network controllers (RNCs). Each RNC 26 is connected to a number of base stations (BS) 28 and any other RNCs in the UTRAN 24. Wireless communication between base station 28 and mobile stations (MSs) 30 is via a wireless / air interface.
    [6] In this embodiment, radio access is based on WCDMA with each radio channel assigned using a WCDMA spreading code. The UTRAN 24 provides services to and from the mobile station over the air interface for external core networks 12 and 14 (and eventually external core network end users) without requesting the specific radio resources required to provide these services. . The UTRAN 24 necessarily hides these details from the service node, the external network and the user. Instead, the "logical" radio access "bearer" is simply requested by the service node 16 from the UTRAN 24. The radio access bearer corresponds to a UTRANS service that carries user data substantially over the UTRAN and over the air interface. The term "connection" corresponds to a set of control signaling associated with one particular mobile station in addition to all access bearers.
    [7] The task of the UTRAN 24 is to map the mobile connection onto a physical transport channel in a flexible, efficient and optimal manner. Thus, each service node is simply requesting one or more radio access bearers from the mobile station, where each bearer may have an associated quality of service. The quality of service may include, for example, the desired bit rate, the amount of delay before information is transmitted, the minimum bit error rate, and the like. In response to a radio access request to support the connection, the UTRAN 24 allocates a transmission resource (e.g., an ATM transport connection) through it and a radio channel (e.g., a spreading code) over the air interface. .
    [8] When mapping a radio access connection onto one or more specific radio channels, UTRAN 24 flexibly balances a number of parameters including quality of service, range (distance between mobile station and base station), traffic load-capacity, and mobile station transmit power. To optimize. One of two different types of radio channels is selected by the RNC 26 to support mobile station access, dedicated or common channels. The two radio channel types are different depending on the degree of radio resource reservation per channel. In the case of a dedicated radio channel, the spreading code (s) and resources related to power / interference are allocated to this particular mobile station. A common radio channel is a resource (spreading code) that is dynamically shared among multiple mobile stations. Based on the requested quality of service and current traffic conditions, the RNC 26 may select a radio channel type to carry information related to the radio access bearer service request.
    [9] As an example, when high quality of service with low latency guarantees is needed, the RNC 26 may map the connection onto a dedicated channel. In addition, dedicated channels support diversity handoff, including soft and softer handoff, as well as high-speed power control. These features improve the communication quality in CDMA communications and also provide for efficient transmission of continuous data streams. For delay tolerance, infrequent or small packet data, the RNC 26 may map the connection onto a common (shared) packet channel. Dedicated channels can use radio resources inefficiently because the channel remains dedicated even when no information is transmitted, but common type channels provide a connectionless transport that can be scheduled to provide more efficient use of radio channel resources. do.
    [10] Even during the lifetime of a single radio access bearer it may be important to use the best type of channel. Indeed, switching of the channel type to support the ongoing radio access bearer can be initiated because:
    [11] ㆍ Channel status is changed
    [12] The radio access bearer is added to or removed from the connection,
    [13] This is because the amount of packet data to be transmitted is significantly changed.
    [14] For example, there is a connection between a mobile station and a network having one radio access bearer set up for background packet data. This connection uses a common channel. When a user initiates a voice call, an additional radio access bearer for voice is established. This connection then includes two radio access bearers. This connection will switch to the dedicated channel because voice requires radio access bearer with low delay and resource reservation requiring a dedicated channel. As another example, a dedicated channel is established to support a connection that initially transmits a large amount of data through a radio access bearer. After this transmission, small amounts of data or data bursts are transmitted more efficiently on common packet-type channels to support this connection by causing switching from a dedicated channel to a common channel. In addition, switching this connection back to a dedicated channel may be efficient or even needed if the amount of data or traffic conditions or other factors are required.
    [15] However, channel type switching that maximizes the use of radio resources to accommodate the requested service incurs a " channel switching cost " that adapts to current traffic conditions and the like. Establishing and releasing a channel requires some amount of data processing resources and a certain amount of delay time to perform. For example, before switching from a common type channel to a dedicated channel, the "serving" RNC for the connection (and any other RNCs that support this connection if possible) may first serve the serving RNC (and any other supporting RNCs) and the base station. In addition to reserving transmission resources between nodes, a base station must be requested to set up both hardware and software resources for this particular connection, and after switching from a dedicated channel to a common type channel, the serving RNC will allow the base station to provide a dedicated connection. Releases all base station resources related to the UTRAN and also releases dedicated channel transmission resources for this connection in the UTRAN Each channel type switch requires this connection to support multiple services and / or multiple transport channels. Doing so incurs setup / release costs for multiple parallel transport bearers. When there is typically a transport channel for each radio access bearer, each transport channel uses UTRAN transmission resources between the RNC and the base station, for example AAL2 / ATM connections, when using a dedicated channel. Switching from a channel to a dedicated radio channel requires another procedure, including, for example, reserving diversity handover resources at the RNC.When the system is operating and the system remains configured and normally established, Since it is already set up, switching from the dedicated channel to the common channel in other directions is not costly.
    [16] Where possible, it is desirable to reduce channel type switching costs without compromising the flexibility and efficiency offered by channel type switching.
    [17] Channel switching costs are also incurred during the handover operation. While handover operation generally provides mobility and other advantages, for example diversity handover, improves communication quality, the mobile station connection in each cell involved in the mobile station handover operation may be added and There is a cost to release. The cost of a new cell to support this connection is, for example, network signaling to reserve resources at the base station, transmission resource setting between the network and the base station, signaling between the mobile station and the base station to add a specific cell, and the cell no longer supports the connection. Performing these operations in reverse sequence when not. In a soft handover procedure, prior to adding a cell to a set of cells currently supporting a connection, the serving RNC first establishes both hardware and software resources for this particular connection, as well as serving the RNC and base stations that are available to be supported by the supporting RNC. A request should be made to the base station (possibly by another supporting RNC) to establish the transmission resource between the two. If the mobile station is instructed to release the cell from the current set, the serving RNC (and possibly other supporting RNCs) releases resources at the base station as well as releasing transmission resources between the RNC (s) and the base station. In the case where several parallel services require multiple transport channels, each addition / deletion of a cell causes the setting / release of several parallel transmission resources.
    [18] Addition and deletion of cells during handover use valuable radio resources and are often triggered by rapid changes in the radio environment. Therefore, the faster the cell is added and deleted, the better the handover operation is adapted to the current wireless environment. It is common for the mobile station to be located at the boundary between two or more cells, in which case the cells are added and deleted many times during the connection lifetime to optimize radio performance, for example due to fast multipath fading. When the above-described setup and release procedures between the RNC (s) and the base station are used for the addition / deletion of cells, respectively, the speed at which the soft handover is performed is based on the generated data processing load and each cell addition or removal. Limited by both delays.
    [1] TECHNICAL FIELD The present invention relates to mobile communications, and more particularly to efficient allocation and use of resources in mobile communications networks.
    [19] 1 is a functional block diagram of an example mobile communication system in which the present invention may be employed.
    [20] 2 is a flow chart illustrating a channel switching routine in accordance with the present invention.
    [21] 3 is a functional block diagram illustrating a channel type switching embodiment of the present invention in the context of the system shown in FIG.
    [22] 4 is a flowchart of a schematic flow chart according to a channel type switching embodiment of the present invention.
    [23] 5 illustrates an example signaling associated with a first channel type switching embodiment.
    [24] 6 is a functional block diagram illustrating soft handover and softer handover in a mobile communication system.
    [25] 7 is a functional block diagram of a second embodiment of the present invention applied to handover in the context of the system shown in FIG.
    [26] 8 is a flowchart showing a procedure for executing a second embodiment.
    [27] 9 is a functional block diagram of the performance of an RNC controller that may be used in one of the first and second embodiments of the present invention.
    [28] It is an object of the present invention to provide flexible and efficient resource allocation in a mobile communication system.
    [29] It is another object of the present invention to minimize channel switching costs, including delays as they relate to channel-tie switching and handover operations.
    [30] It is still another object of the present invention to provide different levels of adaptation to various situations, including wireless environments, user data traffic, and the like, to handle radio network resources and radio resources that support a particular connection. For example, in some situations to provide a high speed allocation of radio resources to optimize air interface performance in response to state changes while providing less fast response within a radio access network.
    [31] The present invention meets these and other purposes by providing a solution to the above-mentioned problems and by providing an efficient channel switching procedure in a mobile communication system. In general, a first channel is established to support connection with a mobile station via a radio access network. Then, even though the first channel is no longer used to support this connection, a portion of the first channel is maintained for a period of time. In this way, if the first channel is needed again to support this connection with the mobile station, the retained portion of the first channel is simply reactivated to avoid the cost of channel switching associated with channel establishment and release operations. The portion of the first channel maintained may be related to a resource in the radio access network, for example. Another portion of the first channel corresponding to the radio channel resource supporting the connection between the radio access network and the mobile station is used for another mobile connection after the first channel is no longer used to support this connection. It may be released to make it possible.
    [32] Radio channel resources may be observed as a single resource or as multiple resources. In the latter situation, multiple radio channel resources may include, for example, (1) spreading codes or other physical radio channels and (2) power resources. In some situations, it may be desirable to release only one of the multiple radio channel resources. For example, power resources are simply released by stopping transmission using the assigned spreading code. However, the spreading code itself is not released for use in other connections. This in particular provides a fast release and reset procedure because reassignment signaling and spreading code deallocation with the RNC is avoided. Only "transmit on" or "transmit off" signals may be transmitted "in-band" over the established dedicated transport channel and wireless channel. In addition, the interference level is reduced, which is highly desirable in spread spectrum based communication systems.
    [33] The first channel may correspond to a dedicated type of channel that is reserved for connection with the mobile station in one example. This connection is switched to a second type of channel that is not reserved for a particular mobile station, ie corresponding to a common channel shared by multiple mobile stations. The present invention allows this connection to be switched back to the dedicated channel at high speed and efficiency.
    [34] In another example, the first channel is one of a plurality of channels established between the mobile station and the radio access network in accordance with a handover operation. During a handover operation, this connection is handed over from a first radio access network cell where a first channel is established to a second radio access network cell where a second channel is established to support a connection from the radio access network to the mobile station.
    [35] The channel portion that is maintained for a period of time after the channel is no longer used to support this connection may include multiple subparts. Any sub-part can be kept or released as desired when the channel is no longer needed. For example, the first subpart may be associated with a resource in a wireless network control node, such as the RNC in FIG. 1. The second sub-part may correspond to a transmission resource on a link between the radio network control node and the base station. The third subpart may be associated with a resource in one base station. The fourth sub-part may correspond to one of the plurality of radio resources.
    [36] By maintaining one or more portions of the first channel, the signaling and processor costs as well as the delays associated with the first channel reset are reduced. In addition, the radio resource (s) used to complete the channel between the base station and the mobile station can be released at high speed and optionally. Fast release and re-establishment of channels enables fast radio reallocation, thereby allowing limited radio resources to be optimally utilized.
    [37] BRIEF DESCRIPTION OF THE DRAWINGS The above-mentioned objects, features and advantages of the present invention and other objects, features and advantages are shown in the accompanying drawings and become apparent from the following description, wherein like reference numerals refer to like elements throughout. The drawings are not necessarily to scale, but are instead shown to illustrate the principles of the invention.
    [38] The following description of specific embodiments, procedures, techniques, etc. is described for the purpose of understanding the present invention and is not intended to be limiting. However, one of ordinary skill in the art will appreciate that the present invention may be practiced in other embodiments that depart from these specific details. For example, the invention is illustrated in two embodiments. These embodiments are merely examples and do not limit the scope of the invention as defined by the claims. In other instances, detailed descriptions of well-known methods, interfaces, devices and signaling techniques have been omitted so as not to obscure the present invention due to unnecessary description.
    [39] 2 shows a flow diagram of a channel switching routine (block 32) illustrating an example procedure that may be used to carry out the present invention. Of course, those skilled in the art will appreciate that other steps and procedures may also be used. The first channel is established to support connection with the mobile station via the UTRAN or through another radio access network (block 33). As described above, for purposes of explanation, the term "connection" is referred to as a "logical" connection between a mobile station and another user, such as a core network user or another mobile station, which refers to one or more data streams associated with the mobile station, e. For example, it may include a voice data stream, a video data stream, a file transfer data stream, an e-mail data stream, etc. This setup procedure may be used to route logical connections to a mobile station and to a physical channel that physically delivers connection information from the mobile station. This includes mapping.
    [40] One or more state changes of the connection itself or of the network are detected (block 34). For example, the amount of information for the connection to be transmitted varies considerably, traffic demands increase or decrease, the level of interference in the cell in which the mobile station is currently located changes, and the mobile station moves to the position where it initiates a handover operation. Thus, this connection is established via the second channel (block 35). However, even though this connection is currently established through this second channel, one or more portions of the first channel are maintained even if these portions of the first channel are no longer used (block 36). On the other hand, one or more resources associated with the first channel may also be released (block 37). For example, in a broadband-CDMA system, radio resources corresponding to spreading codes are preferably released so that they can be used for another mobile station connection. Then, if this connection is reestablished with the first channel (block 39), the retained one or more portions of the first channel avoid the channel release and establishment procedure that must be performed by simply reactivating. For one or more resources of the first channel released in step 37, a new resource is allocated to replace the released resources.
    [41] One of the advantages of the present invention is the flexibility to specify which part of the channel is to be maintained for a longer period of time and to release other channel parts more quickly. For example, some parts of the channels in the radio access network may be more suitable for the former, while some radio resources may be more suitable for the latter (although not necessarily in all circumstances). In addition, the designation to keep any portion of the channel longer or release more quickly can be changed as needed.
    [42] Reference is now made to FIG. 3 which shows a functional block diagram of a mobile communication system 10 in which a first, non-limiting embodiment of the present invention applied to channel type switching is used. The radio network controller (RNC) 26 (only one shown for illustrative purposes) is a packet handler entity 50, a channel type entity switch 52, a common channel scheduler entity 54, a diversity handover unit 56. Multiple functional entities, such as transport processing entity 58, all of which are controlled by RNC controller entity 60. RNC transport processing entity 58 interfaces with base station transport processing entity 62. Base station 28 also includes a common channel processing entity 64, a dedicated channel processing entity 66, and a wireless transceiver 68, all of which are controlled by the base station controller entity 72. Separate transceivers can be used.
    [43] The function of the entity may be performed at the media access control (MAC) protocol level, for example. At the MAC level, information from the logical connection is mapped to a physical transport medium, which is a common type physical channel shared by a plurality of mobile stations and a dedicated channel assigned to a particular mobile station for a particular time. It includes. Of course, other types of channels may be included. The packet handler entity 50 is coupled with the channel type switch entity 52. The RNC controller entity 60 detects various changes in the connection state or network state so that the channel type switch entity 52 sends an information packet corresponding to the connection with the common channel scheduler entity 54 or diversity handover entity 56. Control whether or not to switch. The common channel scheduler entity 54 collects data packets for this connection or other connections and provides them to the transport processing entities 56 and 52 and the base station common channel processing entity for transmission over the air interface. Diversity handover entity 56 communicates with two or more base station cells (if the mobile station is currently in handover operation) via transport processing entities 56 and 62, base station dedicated channel processing entity 66, and wireless transceiver 68; Sends a data packet corresponding to the connection. RNC controller entity 60 and base station controller entity 72 coordinate these various operations as well as similar operations for uplink connections that are data communicated from mobile stations.
    [44] Various links or portions of the common channel, channel type switch entity 52, common channel scheduler entity 54, transport processing entities 58 and 62, common channel processing entity 64 and wireless transceiver 68 are mobile communications. It is set up and configured when the system is configured. Thus, there is no need to release or reset the common channel for various connections. The mobile station 30 simply transmits or receives on a quasi-permanent control channel configured using a common control channel spreading code. On the other hand, a dedicated channel is set up and released for each mobile connection resulting in data processing and associated delay costs. The cost associated with channel type switching performed by the channel type switch entity 52 in response to a command from the RNC controller entity 60 can be reduced as follows.
    [45] The dedicated channel may be divided into two or more path links. Three path links are shown by way of example in FIG. 3, but path link 1 corresponds to a resource in the RNC needed for a dedicated channel that includes a diversity handover entity 56. Path link 1 requires the following channel establishment and release functions, allocation of diversity handover entity 56 and connection with the transmission resources provided by 58. Path link 2 corresponds to the transmission resource on the link between the RNC 26 and the transport processing entities 58 and 62 of the base station 28. The channel establishment and release functions for path link 2 allow the allocation / release of transmission resources on the link and transport paths (e.g. for AAL2 / ATM, protocol Q.AAL2 to signal the establishment of an AAL2 connection between the RNC and BS). It can be used to turn on (or may be used for). Path link 3 corresponds to a resource in the BS that contains the channel link between the transport processing entity 62 and the wireless transceiver 68. Path link 3 requires the following channel establishment and release functions, i.e., allocation / release of signal processing resources in the BS hardware device. Finally, path link 4, which corresponds to the radio link itself, includes the following setup and release functions: spreading code and allocation / release of transmit power. The reservation, establishment, and release of path links 1, 2, and 3 require both data processing resources and time to achieve this. This is particularly true where dedicated channel connections support multiple data streams / services / bearers. This is because at least path links 2 and 3 are typically turned on / off for each data stream / service / bearer.
    [46] In accordance with an example of the invention, but not limited thereto, after initially being reserved and established for a connection, path links 1, 2, and 3 remain after the connection has been switched to the common channel for some period of time, supporting this connection. If the channel type is switched back to the dedicated channel by the channel type switch entity 52, there is no need to repeat the reservation and setup for these links. In addition, the release procedure for path links 1, 2 and 3 need not be performed when the channel type switch is first made from the dedicated channel to the common channel. On the other hand, because radio resources are insufficient in the mobile communication system, path link 4 cannot be maintained when this connection is switched to the common channel. Therefore, path link 4 is released and then later reserved and reestablished using conventional procedures if this connection is switched back to the dedicated channel. The setup and tear down costs associated with path link 4 are typically worth paying for so that radio resources can be used for other connections.
    [47] In addition, radio channel resources may be selectively handled. For example, radio channel resources may include (1) spreading codes (or other types of physical radio channels) and (2) power resources. In some situations it may be desirable to release only the power resources to maintain a reservation of the already allocated spreading code. Power resources are simply released by stopping transmission using the assigned spreading code. While the spreading code itself is not released and cannot be used for another connection, maintaining the spreading code provides a particularly fast release and reset procedure. Spreading code deallocation and reallocation signaling with RNC is not necessary. Instead, only "transmit ON" or "transmit OFF" signals may be transmitted "in-band" via the dedicated UTRAN transport channel and the radio channel. In addition to further reducing channel type switching costs and delays, interference levels are reduced, which is highly desirable in spread spectrum based communication systems.
    [48] Of course, not all path links or portions of these links need to be maintained for all or the same time period. Indeed, only one or two path links or portions of these links may use a particular category of this path link resource within UTRAN while de-supporting and establishing these path links when the connection is switched back to a dedicated channel. Maintained based on a tradeoff between processing and delay costs. On the other hand, portions of the three path links 1, 2 and 3 and / or path link 4 may be treated as a single UTRAN path link (at least conceptually) maintained for some period of time, but path link 4 or UTRAN and the mobile station Only part of the path link 4 between them is not maintained after the channel type switching operation. If this time period expires before the connection is switched again, the retained path link is released for use by the UTRAN to support another connection.
    [49] An example procedure set corresponding to the channel type switching routine (block 100) is shown in a flow chart in FIG. The first type of channel connection is established as a mobile station in the UTRAN, including establishing two channel path links comprising one or more radio access network path links and a radio resource path link (block 102). One or more radio access network links are used as described in connection with FIG. 3. In the example of FIG. 3, this first type of channel is a dedicated channel established by the RNC controller entity 60. The RNC controller entity 60 detects the need to switch the connection to the second channel type (eg, because the traffic load in the current cell changes) and issues a channel type switch command to the channel type switching entity 52. (Block 104). The channel type switching entity 52 switches the connection from the first type of channel to the second type of channel. In the example of FIG. 3, the second type of channel corresponds to a common type channel shared by multiple mobile stations (block 106). One or more radio resources are released (e.g., power resources are released) for the first channel, i.e., the path link or a portion of the link, so that such resources are available for other mobile station connections (block 108). . The already established path link or portion of the link in the UTRAN for the connection is held for a predetermined time before being released (block 110).
    [50] The RNC controller entity 60 detects the need to switch the connection of the second type of channel back to the first type of channel (e.g., the traffic load is changed again or the service is upgraded) and the channel type switching command is channeled. Type switching entity 952 (block 112). The entity 52 switches the connection back to the first type of channel (eg, the dedicated channel of FIG. 3) using the UTRAN path link or part of the link already established (block 114). Each maintained path link of its portion is simply reactivated without incurring the usual channel release and establishment costs for this link or portion. Then, a new radio resource or resources (eg, corresponding to path link 4 or part of this link in FIG. 3) are allocated for connection (block 116).
    [51] 5 is a non-limiting signaling diagram illustrating various functions and control signals performed by a channel type switch, an RNC controller, a base station controller, and a mobile station. Initially, the RNC controller allocates radio resources for dedicated channels to support connections with mobile stations, such as one or more spreading codes and power resources. The diversity handoff unit is reserved and configured for the dedicated channel corresponding to path link number 1. The dedicated channel establishment request message is sent to the base station controller entity, which then reserves and sets up the necessary dedicated channel processing resources with the base station, including setting up the path links 3 and 4. Upon completion, the base station controller sends a dedicated channel establishment confirmation message (ACK) back to the RNC controller. Both the RNC controller and the base station controller establish a transport link for a dedicated channel corresponding to path link 2 of FIG.
    [52] Once the dedicated channel is established, the RNC controller sends a switching connection message to the RNC channel type switching entity to switch the dedicated channel to the common channel due to a change in state detected by the RNC controller. The RNC controller sends a switch connection message (DCH → CCH) to the mobile station. Both the channel type switch entity and the mobile station send an acknowledgment (ACK). The RNC controller then sends a command to the base station controller to release the dedicated channel radio resource or portion of that resource (path link 4) and the base station controller sends an acknowledgment (ACK) when these radio resources are released.
    [53] Often, the RNC controller then determines which state change causes the switch back to the dedicated channel. The RNC controller issues a switch to a dedicated channel message to the channel type switching entity and the base station controller. The RNC and the base station controller entity reactivate the maintained link or part of this link if the predetermined time associated with these links has not expired. The base station controller also sets up radio resources to replace previously released path link 4 or portions of this link to complete the dedicated channel and issue a dedicated channel command to the mobile station. Both the mobile station and the channel type switch send an acknowledgment message to the RNC controller entity when the channel type switch is made.
    [54] Another example of the present invention is handover. When the mobile station moves around the mobile communication network, it receives a signal transmitted from one or more base station cells with better signal quality than that received from other base stations. There are three types of handovers, including hard handover, soft handover, and softer handover, and the present invention can be applied to all three of them. In hard handover, the connection is "broken" from the old base station cell before the connection is "made" in the new base station cell. In soft handover, the connection is made with the new base station cell before the connection is disconnected from the old base station cell. In softer handover, the concept of a base station cell extends to each base station sector antenna, where one or more sector antennas transmit to the corresponding sector cell. The connection with the new sector cell is made before the connection with the old sector cell is lost (like soft handover).
    [55] 6 shows a mobile station in soft handover for establishing a connection between a base station cell (A) and a base station cell (B). Both base station cells A and B support connection with the mobile station 30. Similarly, in softer handover, each of the base station sector cells 5 and 6 supports a connection with the mobile station 30. When the mobile station 30 moves far enough away from one of the pair of cells supporting the connection with the mobile station, the connection is deleted or disconnected. However, there are often cases where the position of the mobile station oscillates near or around an overlapping area covered by two cells. Thus, the mobile station can move very well into and out of handover with one or more cells. Each time a handover operation is initiated again, channel establishment and release costs associated with this handover channel are incurred. In this example handover embodiment, the present invention substantially reduces this cost.
    [56] A description will now be made with reference to FIG. 7, which shows a functional block diagram of various path links used in establishing a handover channel to support mobile station connection in a mobile communication system as shown in FIG. Since this example relates to a CDMA system that supports diversity handover between cells of two base stations, this description relates to a diversity handover unit associated with dedicated channels DCH1 and DCH2 used to support mobile station connections. However, one of ordinary skill in the art will appreciate that the present application may also be used in systems that are not based on CDMA where two phases of base station cells, two or more sector cells, and hard handover are used.
    [57] As described above in connection with FIG. 3, a connection is established between the core network service node 16 and the mobile station 30 via the UTRAN 24. Packet handler 50, which processes packets from and to the core network service node 16, is coupled with diversity handover unit 56 assigned to this dedicated channel to support handover connections. The first portion of the dedicated channel, designated as path link 1, corresponds to the link between diversity handover unit 56 and transport processing entity 58. The second portion consists of two transport processing entities 58 (one for each base station) and each transport processing entity 62 in the two base stations 28 shown in FIG. 7 for DCH1 and DCH2. Corresponds to path link 2 that combines. The third portion of the dedicated channel supporting this connection corresponds to each path link 3 at each of the two base stations 28 between each transport processing entity 62 and the transceivers 68 for DCH1 and DCH2. Finally, the radio portion of the storage channel corresponds to the path link 4 shown between the two base station transceivers 68 and the mobile station 30. As mentioned above, the path link corresponds to each resource at the RNC, resources for the RNC-BS transmission connection, resources at the base station and radio resources. The function of each path link or part of this link is similar to that described above, e.g. similar to resource establishment / release, node signaling and radio resource allocation / release, etc. within a node.
    [58] An example procedure that may be performed in the handover example of the present invention will now be described with reference to the flowchart shown in FIG. The RNC controller entity 60 establishes a first dedicated channel DCH1 from the UTRAN 24 to the mobile station 30, including establishing the diversity handover unit 56 and two or more support path links. If there are two support path links, for example, the first path link may correspond to the path link via the UTRAN 24 and the second path link may correspond to the radio resource path link between the UTRAN and the mobile station. Of course, as shown in FIG. 7, the UTRAN path link may also be broken for multiple path links, such as path link 1-3. In addition, each path link may be broken for multiple portions, for example, path link 4 may include spreading code resources and transmit power resources. The second dedicated channel DCH2 is established by the RNC controller entity 60 between the UTRAN 24 and the mobile station 30, including two or more support path links, that is, one or more UTRAN path links and a radio resource path link (block 204). .
    [59] Block 206 indicates that the handover operation has been completed to the extent that a dedicated channel DCH1 supporting the connection with the mobile station 30 is no longer needed. The radio resource or radio resource corresponding to path link 4 reserved for DCH1 or a portion of this resource is released so that they can be used for other mobile station connections. In contrast, the other UTRAN path link established for the dedicated channel DCH1 supporting this connection, or part of this link, is maintained for a period of time (block 208). Next, handover is resumed in the cell to which the dedicated channel DCH1 was originally assigned (block 210). A determination is made at RNC controller entity 60 as to whether the predetermined time period has expired (block 212). If so, the maintained UTRAN path link or part of this link is released. Thus, a new dedicated traffic channel is established in this particular cell to support connection with the mobile station using conventional channel establishment procedures (block 214). On the other hand, if the time period has not yet expired, the RNC controller entity 60 simply reactivates the maintained UTRAN path link for dedicated channel DCH1 and assigns the corresponding new radio resource to path link 4 in FIG. Support connection.
    [60] Thus, when a mobile station moves forward and backward between two base station cells, the present invention relates to channel establishment and release by maintaining one or more path links in the UTRAN 24 for some predetermined period of time, saving data processing resources. Reduce handover delay As in the first embodiment, one, some, all or some portion of the UTRAN path link is maintained for a predetermined period of time to facilitate efficient channel type switching operation with respect to handover.
    [61] If path link 4 corresponding to a radio resource is observed as a plurality of resources, only a portion of path link 4 corresponding to one of these radio resources can be released. For example, spreading code resources are maintained for some period of time so that as soon as they are deallocated, there is no cost of reallocating the spreading code for the connection. On the other hand, the transmit power resource can be released simply by stopping the transmission. The only necessary signaling between the RNC and the base station is simply to stop the transmission command before the start transmission command when path link 4 is reset. These simple commands can be transmitted in-band over established transmission resources, i.e., the path link between the base station and the RNC.
    [62] Thus, in the soft handover example, the following procedure may follow. First, the dedicated channel DCH1 is set to BS1 and the dedicated channel is set to DCH2 using the corresponding radio resource including the spreading code and the transmit power resource. The dedicated channel DCH1 is then logically released by signaling to the mobile station. However, most of the resources reserved for DCH1 remain for a certain period of time. Transmission to DCH1 is stopped by sending a STOP transmission message to BS1 based on the reserved transport connection between RNC and BS1. When a reset of the DCH1 is required, the RNC sends another in-band signal, i.e. a START transmission, to the BS1 upon transport connection to activate the transmission using a reserved pre-allocated spreading code. The RNC then signals to the mobile station to reset DCH1.
    [63] In addition, each maintained path link may have an associated counter. The example shown in FIG. 9 shows path link counters 252, 254 and 256 coupled to the CPU 250 of the RNC controller. Some counters may be used depending on the number of links maintained. If one of the plurality of radio resources is maintained, a fourth counter may be used. When the RNC controller of the base station to which the dedicated channel DCH1 is assigned detects that DCH1 is no longer needed, a signal is sent from the CPU 250 to each of the path link counters 252, 254 and 256 to initiate counting. Increment by value or decrease to zero from a predetermined value. Each counter has a corresponding count value that does not need to be the same as the count value associated with the other counter. Each of these counters counts up or down to the corresponding expiration value and provides an indication to the CPU 250 upon reaching the same value. CPU 250 then generates a path link control signal that releases the corresponding UTRAN path link maintained. These counters provide additional flexibility to handle the various path links 1-3 separately, depending on their lack in relation to other path links.
    [64] Although the present invention has been described in connection with specific embodiments, those skilled in the art will recognize that the invention is not limited to this specific embodiment. These various illustrated, described formats, embodiments, and applications, as well as various modifications, changes, and equivalent devices may also be used to implement the present invention. Accordingly, the invention is limited only by the scope of the appended claims.
    权利要求:
    Claims (40)
    [1" claim-type="Currently amended] A method in a wireless communication system having a wireless network having a plurality of mobile stations and a plurality of base stations, the method comprising:
    (a) establishing a first path link for a first channel from a wireless network to a base station and a second path link for the first channel from the base station to a mobile station, while establishing a connection with the mobile station on a first type of channel. The initial setup,
    (b) switching a connection from said first channel to a second channel, and
    (c) then resetting the connection on the first channel by using at least a portion of the initially established first path link.
    [2" claim-type="Currently amended] The method of claim 1,
    Wherein said first and second channels are different types of channels.
    [3" claim-type="Currently amended] The method of claim 1,
    Wherein the first channel is a dedicated channel and the second channel is a common channel.
    [4" claim-type="Currently amended] The method of claim 1,
    The reset step (c) is:
    Allocating a new second path link for the first channel to the connection.
    [5" claim-type="Currently amended] The method of claim 1,
    The second path link includes a plurality of radio resources and the resetting step (c) comprises:
    Resetting the connection on the first channel by using at least one of the plurality of radio resources maintained from the initially established second path link and allocating another new radio resource to the connection. Method in a wireless communication system, characterized in that.
    [6" claim-type="Currently amended] The method of claim 1,
    Wherein the first path link comprises a plurality of parts, and wherein the resetting step (c) comprises using all of the plurality of initially set parts.
    [7" claim-type="Currently amended] The method of claim 1,
    For the resetting step (c), the initially established first path link is reactivated.
    [8" claim-type="Currently amended] The method of claim 1,
    The plurality of base stations are connected to a wireless network controller, the first path link being a first portion associated with a wireless network control node, a second portion between the wireless network control node and the one base station and a second portion associated with the base station. And three or more portions corresponding to any one of three portions.
    [9" claim-type="Currently amended] The method of claim 8,
    Two of the three parts are used in the resetting step (c).
    [10" claim-type="Currently amended] The method of claim 1,
    And wherein said resetting step (c) comprises using only one portion of radio resources allocated to said second path link.
    [11" claim-type="Currently amended] The method of claim 1,
    Maintaining at least a portion of the first path link for a period of time after switching in step (b);
    Detecting whether the predetermined time has expired,
    If not expired, using at least part of the first link initially established in the reset step (c).
    [12" claim-type="Currently amended] A method in a wireless communication system having a wireless network having a plurality of mobile stations and a plurality of base stations, the method comprising:
    After establishing a first channel to support a connection with a mobile station over a radio access network, a portion of the first channel is maintained for a predetermined time after the first channel is no longer used to support the connection; And wherein the retained portion of the first channel is used to minimize setup costs associated with reactivating the first channel to support the connection with the mobile station again.
    [13" claim-type="Currently amended] The method of claim 12,
    A portion of the first channel relates to a resource in the radio access network and another portion of the first channel corresponds to a radio channel resource used to support a connection between the radio access network and the mobile station. Method in a wireless communication system.
    [14" claim-type="Currently amended] The method of claim 13,
    Another portion of the first channel associated with one of the plurality of radio channel resources supports the connection to use one radio channel resource for another mobile communication after the first channel is no longer used. Released in a wireless communication system.
    [15" claim-type="Currently amended] The method of claim 12,
    Setting a value related to the portion;
    Counting when the first channel is no longer used;
    Releasing the retained portion when the counter reaches its value.
    [16" claim-type="Currently amended] The method of claim 12,
    And wherein the first channel is one of a plurality of channels established between the mobile station and the radio access network used in a handover operation.
    [17" claim-type="Currently amended] The method of claim 16,
    During the handover operation, the connection is handed over from a first radio access network cell where the first channel is established to a second radio access network cell where a second channel is established to establish a connection with the mobile station via the radio access network. A method in a wireless communication system characterized by supporting.
    [18" claim-type="Currently amended] The method of claim 12,
    Wherein the first channel corresponds to a dedicated type channel temporarily dedicated to the mobile station and the connection is switched to a second channel corresponding to a common type channel not dedicated to a particular mobile station. Way.
    [19" claim-type="Currently amended] The method of claim 12,
    The wireless network includes a wireless network control node connected to the plurality of base stations and the first channel is between a first sub-part associated with the wireless network control node, the wireless network control node and one of the base stations. And several sub-parts including a second sub-part and a third sub-part associated with said one base station.
    [20" claim-type="Currently amended] The method of claim 19,
    13. The method of claim 12, wherein the portion corresponds to one or more of the three sub portions.
    [21" claim-type="Currently amended] The method of claim 18,
    Setting a first value associated with the first sub-part, a second value associated with the second sub-part, and a third value associated with the third sub-part;
    Counting when the first channel is no longer used;
    Releasing said retained first, second or third portion when said count reaches each of said first, second or third value.
    [22" claim-type="Currently amended] A handover method in a wireless communication system having a wireless network coupled to a plurality of mobile stations and a radio network controller and having a plurality of cells each associated with a base station, the method comprising:
    Initially establishing a connection with the mobile station on a first channel having a plurality of links of a first cell;
    Establishing the connection with the mobile station on a second channel of a second cell;
    Releasing the first channel such that it no longer supports the first connection with the mobile station;
    Maintaining a portion or portion of one of the plurality of links of the first channel;
    Activating the retained link of the deleted channel or portion of the channel when the connection is reestablished in the mobile station and the first cell.
    [23" claim-type="Currently amended] The method of claim 22,
    And wherein the first cell corresponds to a first base station, the second cell corresponds to a second base station, and the handover is a hard handover.
    [24" claim-type="Currently amended] The method of claim 22,
    And wherein the first cell corresponds to a first base station, the second cell corresponds to a second base station, and the handover is a soft handover.
    [25" claim-type="Currently amended] The method of claim 22,
    Wherein the first cell corresponds to a first base station sector, the second cell corresponds to a second base station sector, and the handover is a softer handover.
    [26" claim-type="Currently amended] The method of claim 22,
    Another link of the plurality of links corresponds to a plurality of radio channel resources used to support a connection between the radio access network and the mobile station, and the releasing step releases one of the radio channel resources and releases the one. Handover method in a wireless communication system, characterized in that the radio channel resources of the are made available for other mobile communications.
    [27" claim-type="Currently amended] The method of claim 26,
    Setting a value related to the one link,
    Counting when the first channel is deleted;
    Releasing said maintained link when said count reaches said value.
    [28" claim-type="Currently amended] A wireless network control node in a wireless communication system having a wireless network having a plurality of mobile stations and a plurality of base stations is:
    A channel type switch for supporting connection with a mobile station by selecting one of a first type channel and a second type channel,
    After initially establishing a connection on the first channel with a mobile station wherein the first channel includes first and second channel links, and then switching the connection from the first channel to the second type of channel. A controller for controlling a channel type switch,
    The controller controls the channel type switch to switch the connection from the second channel to the first channel to reset the connection on the first channel by using a portion of the initially established first or second channel link. A wireless network control node in a wireless communication system, characterized in that.
    [29" claim-type="Currently amended] The method of claim 28,
    And said wireless network control node is a base station.
    [30" claim-type="Currently amended] The method of claim 28,
    The wireless network control node is coupled to a plurality of base stations, and the controller establishes a first path link for the first channel from the base station to the base station and a second path link for the first channel from the base station to the mobile station. A wireless network control node in a wireless communication system, characterized in that.
    [31" claim-type="Currently amended] The method of claim 30,
    The first path link includes a first resource in the RNC between the channel switch and the transport processing interface, a second transmission resource between the transport processing interface and the base station of the RNC, and the base station transport processing interface and the radio transmission / reception period. A third resource in a base station, the one or more portions corresponding to any one of the first, second, or third resources.
    [32" claim-type="Currently amended] The method of claim 28,
    A first counter for the first link that detects whether a first predetermined time period has expired;
    A second counter for the second link that detects whether a second predetermined time period has expired, and
    Further comprising a third counter for the third link that detects whether a third predetermined time period has expired,
    When the first, second or third counter detects expiration of each of the first, second or third time periods, the controller is responsible for releasing each of the maintained first, second or third links. And a wireless network control node in a wireless communication system.
    [33" claim-type="Currently amended] The method of claim 28,
    The second path link includes a plurality of radio resources and the controller allocates a new one of the plurality of radio resources and initializes for the first channel when the first channel is reset to support the connection. And using another one of the plurality of radio resources set in the radio network control node in the radio communication system.
    [34" claim-type="Currently amended] The method of claim 28,
    The controller maintains at least a portion of the first path link for a predetermined time period after switching the connection to the second channel, wherein the wireless network control node:
    And a counter corresponding to the first path link for detecting whether a predetermined time period has expired,
    And when the counter detects expiration of the time period, the controller releases the maintained first link.
    [35" claim-type="Currently amended] An apparatus in a wireless communication system having a wireless network coupled to a plurality of mobile stations and a radio network controller and having a plurality of cells each associated with a base station, the apparatus comprising:
    Means for initially reserving a first channel in a first cell to support connection with a mobile station;
    Means for establishing the connection with the mobile station on a second channel in a second cell;
    Means for releasing the first channel so that it no longer supports the first connection with the mobile station;
    Means for retaining a portion of the first channel;
    And means for activating the retained portion of the first channel when the connection is reestablished with the mobile station in the first cell.
    [36" claim-type="Currently amended] 36. The method of claim 35 wherein
    And wherein the first cell corresponds to a first base station, the second cell corresponds to a second base station, and the handover is a soft handover.
    [37" claim-type="Currently amended] 36. The method of claim 35 wherein
    And wherein the first cell corresponds to a first base station sector, the second cell corresponds to a second base station sector, and the handover is a softer handover.
    [38" claim-type="Currently amended] The method of claim 35, wherein
    The retaining means establishes one or more channel links associated with the wireless network and the first cell while the channel link from the first cell to the mobile station or part of the link is released for use in another connection. Device in a wireless communication system.
    [39" claim-type="Currently amended] A method in a wireless communication system having a wireless network coupled to a plurality of mobile stations and a radio network controller and having a plurality of cells each associated with a base station, the method comprising:
    Initially reserving a first channel to support a connection with a mobile station, wherein the first channel has a plurality of resources to support a connection between a base station and the mobile station;
    Establishing a connection with the mobile station on a second channel;
    Releasing one of the plurality of resources for the first channel so that it no longer supports a connection with the mobile station;
    Maintaining another one of the plurality of resources for the first channel, and
    Activating a maintained resource of the first channel when the first channel is reset to support the connection with the mobile station again.
    [40" claim-type="Currently amended] The method of claim 39,
    Wherein said one radio resource comprises a transmit power resource and said other radio resource comprises a spreading code.
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    同族专利:
    公开号 | 公开日
    CA2369647A1|2000-10-19|
    JP2002542687A|2002-12-10|
    CN1135891C|2004-01-21|
    AU772657B2|2004-05-06|
    EP1169878B1|2013-02-06|
    AU4156900A|2000-11-14|
    KR100615530B1|2006-08-25|
    AR023411A1|2002-09-04|
    ES2404510T3|2013-05-28|
    US6507567B1|2003-01-14|
    TW546975B|2003-08-11|
    CN1356006A|2002-06-26|
    EP2469960A1|2012-06-27|
    MY122511A|2006-04-29|
    CA2369647C|2009-10-06|
    WO2000062572A1|2000-10-19|
    EP2469960B1|2013-09-11|
    EP1169878A1|2002-01-09|
    JP4477244B2|2010-06-09|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1999-04-09|Priority to US09/288,862
    1999-04-09|Priority to US09/288,862
    2000-03-21|Application filed by 클라스 노린, 쿨트 헬스트룀, 텔레폰악티에볼라겟엘엠에릭슨(펍)
    2000-03-21|Priority to PCT/SE2000/000555
    2001-12-07|Publication of KR20010108485A
    2006-08-25|Application granted
    2006-08-25|Publication of KR100615530B1
    优先权:
    申请号 | 申请日 | 专利标题
    US09/288,862|US6507567B1|1999-04-09|1999-04-09|Efficient handling of connections in a mobile communications network|
    US09/288,862|1999-04-09|
    PCT/SE2000/000555|WO2000062572A1|1999-04-09|2000-03-21|Efficient handling of connections in a mobile communications network|
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