• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a method of providing a better call success rate to subscribers by lowering the handoff signal between each miniaturized microcell. A preferred embodiment of the grouping and ungrouping method in a microcell environment using pseudonoise offset according to the present invention is a PN_offset not present in three cells in the third path (Cgpath) present in modulator # 2. Generating a pilot signal; PNs exiting from C0, C1, C2, C3, C4, C5, C6, and C7 that the pilot signal of the PN_offset generated in the third path (Cg path) existing in the modulator # 2 supports each of eight cells _ Adding the pilot signal of the offset and the PN_offset to be grouped in the transceiver of each cell and is transmitted to each of eight cells; The signal transmitted to each cell is transmitted to the mBS via the optical cable, the mBS is raised to the frequency of the air state through the transceiver of each cell and transmitted to the terminal of each cell through each mBS; When the pilot signal having the PN_offset to be grouped is output to the antennas (C0, C1, C2, C3, C4, C5, C6, C7) and the antenna of the mBS together with the pilot signal of the existing PN_offset, the terminal is new to be grouped. Recognizing the pilot of the strength and, at this time, if the mBSC increases the pilot signal to be grouped gradually, the terminal is aware of it and the terminal reports the signal size for this new pilot as mBS; The size of the new pilot is transmitted to the upper part through mBS, and the mBSC receiving this report sends a traffic signal to the third path of the third modulator of the unused micro channel card assembly (μCCA), signaling the user with two paths. Receiving process; Gradually reducing the pilot signal used in the existing three sectors while transmitting and receiving through the two paths; The terminal within 8 cells recognizes the weakened pilot signal and reports the strength to mBS, and this report is reported to the upper level through the mBSC, and when the terminal falls below a certain level of strength, the terminal falls back above the mBSC through the mBS. Reporting to the upper part of the base station and receiving the command to receive only the PN_ offset to be grouped; And the terminal receiving the command stops the transmission and reception of the existing PN_offset, and 8 cells transmit and receive with the new PN_offset to be grouped, so that all cells have the same PN_offset and are recognized as one cell. Include. Another embodiment of the grouping and ungrouping method in a micro cell environment using PN_offset to achieve the above object is to provide a pilot signal of PN_offset previously provided by modulators # 0, # 1, and # 2. Generating process; The pilot (Cg) signal of the PN_offset provided in the third path of the modulator # 2 is a pilot signal of the PN_offset newly generated in each of C0, C1, C2, C3, C4, C5, C6, and C7. Combining the transceivers of each cell and transmitting them to each of eight cells; Each transmitted signal is transmitted to the mBS at each cell site by the optical cable, and the mBS step of raising the synthesized signal to the frequency of the air state through the transceiver of the mBS to send to the terminal of each cell; When the newly generated pilot signal having the existing PN_offset is output to the transceiver and the antenna of the mBS together with the grouped PN_offset pilot signal, the terminal recognizes the newly generated pilot signal of the PN_offset. When the mBSC increases the new pilot signal, the terminal recognizes it and the terminal reports the signal size of the new existing pilot as mBS; Reporting to the upper level through the reported mBS size of the new pilot, and the mBSC receiving the report sends a signal by assigning a traffic signal to an unused existing channel of μCCA to send and receive signals through two paths with a user; Gradually decreasing the strength of the grouped PN_offset pilot signals while the terminal transmits and receives two paths; The terminal within 8 cells recognizes the weakened grouped pilot signal and sends the strength to the mBS to report to the upper level, and this report is reported to the upper level through the mBSC, and then the terminal returns to the mBS when it falls below a certain level of strength. Sending a signal to a higher level, and receiving the new base station, receiving the new ungrouped PN_offset; The terminal receiving this command stops transmitting and receiving the grouped PN_offsets, and 8 cells transmit and receive with the new existing PN_offset, and all cells have their respective PN_offsets as before. Include.
    公开号:KR19990056537A
    申请号:KR1019970076535
    申请日:1997-12-29
    公开日:1999-07-15
    发明作者:김태현
    申请人:윤종용；삼성전자 주식회사；
    IPC主号:
    专利说明:

    Grouping and Ungrouping Methods in Microcell Environment Using Pseudo-Noise Offset
    The present invention relates to a grouping and ungrouping method in a micro cell environment using pseudorandom noise offset (PN_Offset). Currently, there are many difficulties in the existing cellular form for the rapidly increasing cellular subscriber propagation service, and a new network is required to overcome this. In particular, the present invention is a technique applied to the micro-cells of the newly created micro-cell system to overcome this, the cell radius is much smaller (radius: 200m) compared to the existing to the micro-environment, the capacity is increased, but inter-cell handoff (Handoff) increases due to a lot of unnecessary calls, which degrades the performance of the call.In this situation, multiple cells are grouped together as if they were one cell, and when the capacity of the subscriber is needed, the group is ungrouped and used again as multiple cells. It is about how to.
    In general, a mobile communication system using a code division multiple access scheme includes at least one base station transceiver subsystem and a base station connected to the base station, as described in US Pat. No. 5,260,987. A base station controller and a mobile switching center system that connects the base station controller.
    In a conventional CDMA cellular system, a base station controller (BSC) and a base station (BTS) are connected by E1 or T1. Therefore, the base station is a digital unit including a CDMA Channel Element Assembly (CCEA) for CDMA signal modulation and demodulation, an RF signal processing unit, a control processor including a base station controller interface and an operation management interface, and a Global Position System (GPS) circuit for base station synchronization. And the like.
    Such a system has difficulty in installing equipment suitable for an urban RF environment, and also has a difficulty in increasing capacity required by a large number of subscribers. Thus, the cells are getting smaller to increase the capacity, which leads to an increase in unnecessary handoffs and degrades the performance of the call. The handoff here refers to a process in which a mobile station moves from one base station to a new base station or within a base station to a new antenna allowance area. It is very important to ensure that the success of the moving call and the quality of the voice information are not degraded during the handoff.
    There are two main methods of handoff: soft handoff and hard handoff. Soft handoff is a method of making-before-cut before cutting a call, and hard handoff is a method of cutting an arc before creating a new call. cut-before-make) method. When a handoff is required by the mobile station, the CDMA system preferentially handles soft handoff. However, if it is unavoidable, the call continuity is guaranteed through hard handoff.
    In the internal structure of the current base station, a base station having a sector cell structure has an antenna for each sector, and the PN corresponding to the sectors receives signals from the mobile switching center system (MSC) to the base station (BTS) via the base station controller (BSC). Offset and long code to use and Walsh code of each channel are multiplied by the modulator chip and transmitted.
    Referring to FIG. 3, a channel card has two modulator chips. There are eight channels in the modulator, and 16 channels exist in one channel card. Each channel is provided with three paths to three sectors, which combine the output of each channel.
    In this structure, when a terminal moves between sectors, a handover occurs and a call break occurs. Considering the importance of the call, the importance of the call is important because the handover call that maintains the call takes precedence over the first call.
    Accordingly, the present invention was devised to remedy the drawbacks of the prior art as described above. In the microcell structure, three modulators are provided on one channel card to provide nine paths. One of the four paths is not used. In this way, PN_offset is generated in the 9th unused path among 9 paths, and 8 sector cells are needed by changing the PN_offset value existing in 8 cells into the grouping PN_offset value generated as a new path. Accordingly, the purpose of the present invention is to provide a better call service by preventing call failure rate between fast mobile operators by operating as one or several grouped cells. It is also an object of the present invention to provide a method of ungrouping the original sector to return to the original sector in order to increase the capacity when the fast user disappears.
    1 is an overall configuration diagram in a micro environment.
    2 is an internal configuration diagram of a base station using a sector cell structure according to the present invention.
    3 is a channel allocation path of the channel card in FIG. 2;
    4 is an overall configuration diagram in a micro cell system.
    5 is a connection diagram of mBSC and mBS.
    6 is an internal configuration diagram of a base station supporting grouping and ungrouping in a micro cell environment according to the present invention;
    7 is a channel allocation path of a channel card supporting grouping and ungrouping in a micro cell environment according to the present invention.
    8 is a network structure below the base station controller.
    One preferred embodiment of the grouping and ungrouping method in a micro cell environment using the PN_offset according to the present invention, which was created to achieve the above object, is a third path (Cg path) present in modulator # 2. Generating a pilot signal of a PN_offset that does not exist in three cells at;
    PNs exiting from C0, C1, C2, C3, C4, C5, C6, and C7 that the pilot signal of the PN_offset generated in the third path (Cg path) existing in the modulator # 2 supports each of eight cells _ Adding the pilot signal of the offset and the PN_offset to be grouped in the transceiver of each cell and is transmitted to each of eight cells;
    A signal transmitted to each cell is transmitted to the mBS via an optical cable, and the mBS is raised to a radio frequency through a transceiver of each cell and transmitted to the terminal of each cell through each mBS;
    When the pilot signal having the PN_offset to be grouped is output to the antennas (C0, C1, C2, C3, C4, C5, C6, C7) and the antenna of the mBS together with the pilot signal of the existing PN_offset, the terminal is new to be grouped. Recognizing the pilot of the strength, and when the mBSC increases the pilot signal to be grouped gradually, the terminal recognizes it and the terminal reports the signal size of the new pilot to the mBS;
    The size of the new pilot is transmitted to the upper part through the mBS, and the mBSC receiving this report sends a traffic signal to the third path of the third modulator of the unused micro channel card assembly (μCCA) to signal the user and the two paths. The process of giving and receiving;
    Gradually reducing the pilot signal used in the existing three sectors while transmitting and receiving through the two paths;
    The terminal within 8 cells recognizes the weakened pilot signal and reports the strength to the mBS, which is reported to the upper level through the mBSC, and when the terminal falls below a certain level of strength, the terminal returns the mBS again. Reporting to the upper part of the mBSC and receiving the base station is a command to receive only the PN_ offset to be grouped; And
    The terminal receiving the command stops transmitting and receiving the existing PN_offset and 8 cells transmit and receive with the new PN_offset to be grouped, so that all cells have the same PN_offset and are recognized as one cell. do.
    Another embodiment of the grouping and ungrouping method in a micro cell environment using PN_offset to achieve the above object is to generate a pilot signal of PN_offset previously provided by modulators # 0, # 1, and # 2. Making process;
    The pilot (Cg) signal of the PN_offset provided in the third path of the modulator # 2 is a pilot signal of the PN_offset newly generated in each of C0, C1, C2, C3, C4, C5, C6, and C7. Combining the transceivers of each cell and transmitting them to each of eight cells;
    Each transmitted signal is transmitted to the mBS at each cell site by the optical cable, and the mBS raises the synthesized signal to a radio frequency through the transceiver of the mBS and sends the synthesized signal to the terminal of each cell;
    When the newly generated pilot signal having the existing PN_offset is output to the transceiver and the antenna of the mBS together with the grouped PN_offset pilot signal, the terminal recognizes the newly generated pilot signal of the PN_offset, At this time, when the mBSC increases the new pilot signal gradually, the terminal recognizes it and the terminal reports the signal size for the new existing pilot to the mBS;
    The mBSC is reported to the upper level through the mBS that has received the report of the size of the new pilot, and the mBSC, which receives the report, sends a signal by assigning a traffic signal to an unused existing channel of μCCA to send and receive signals in two ways with the user. process;
    Gradually decreasing the strength of the grouped PN_offset pilot signals while the terminal transmits and receives two paths;
    The terminal within 8 cells recognizes the weakened grouped pilot signal and sends the strength to the mBS to report to the upper level, and this report is reported to the upper level through the mBSC, and then the terminal falls below a certain level of strength. Sending to the mBS again and reported to a higher level, the base station receiving a command to receive only a new PN_offset to be ungrouped; And
    The terminal receiving this command stops the transmission and reception of grouped PN_offsets, and 8 cells transmit and receive with the new existing PN_offset, and all cells have their respective PN_offsets as before. do.
    Current micro-systems divide the base station installed in Personal Communication Services (PCS) into digital hardware and RF transceiver parts, and use optical fiber based on Subcarrier Multiplexing (SCM) technology. Connected. In other words, this architecture is a small base station controller (mBSC) that is responsible for the digital hardware portion of an existing base station capable of centrally managing resources to support multiple microcells, and a small base station that is responsible for the RF portion of the base station. It is divided into a base station (micro base station transceiver) (mBTS) and has a structure that connects between the optical cable (optic cable).
    The mBSC centrally manages small base stations and dynamically allocates channels to each cell to economically expand the system capacity according to the increase in traffic, thereby enabling cell design to satisfy an optimal state.
    In the forward path, the mBSC converts a signal destined for each mBS into an optical fiber cable frequency and transmits the signal through an HFR network. The mBSC receives the signal and converts the signal into a personal mobile communication RF frequency, which is transmitted through an antenna. The RF frequency signal received from the terminal is received in the mBS and transmitted to the mBSC via a reverse path.
    In particular, the GPS receiver of the mBSC is transmitted through the HFR network to maintain synchronization between the small base stations without separately installing the GPS receiver in these small base stations. By doing so, the mBS price can be reduced, weight and size can be reduced, and flexible cell design is possible even in a shaded area of a tunnel and a room where the GPS antenna is difficult to install. Systems and networks having such functions can be easily interworked with other communication networks and can flexibly respond to various wireless communication services.
    In such a system, by using a plurality of cells or the like dynamically grouped or ungrouped, it is possible to achieve a balance between optimal cell coverage and capacity according to the traffic. That is, to generate a PN_offset to be grouped, a PN_offset to be grouped (Cg) in the third path of the third modulator. Therefore, the PN_offsets of the eight cells used previously are replaced with the PN_offsets to be grouped, so that all 8 cells have the same PN_offset.
    Then, when 4 channels are supported by Cg path and then the capacity is increased, PN_ offset is generated by the existing path again, and PN_ offset used by 8 cells is the same as each PN_ offset of 8 cells. Change to to ungroup again.
    Hereinafter, the operation principle of the present invention with reference to the drawings in detail. First, a method of grouping eight cells into one cell generates a PN_offset pilot signal in which three cells do not exist in the third path (Cg path) in modulator # 2. Here, the third path of the third modulator is an unused path according to the structure of 8 cells.
    The pilot signal of PN_offset generated in the third path (Cg path) in modulator # 2 is the PN_offset from C0, C1, C2, C3, C4, C5, C6, C7 The pilot signal and the PN_offset to be grouped in the transceiver of each cell are transmitted to each of eight cells.
    The signal transmitted to each cell is transmitted to the mBS by the optical cable, and the mBS is raised to the air frequency through the transceiver of each cell and transmitted to the terminal of each cell through each mBS.
    When the pilot signal having the PN_offset to be grouped is output to the transceiver and antenna of the mBS together with the pilot signal of the existing PN_offset, the terminal recognizes the pilot of the new strength to be grouped, and the mBSC gradually acquires the pilot signal to be grouped. Increasing the terminal will be aware of it and the terminal will report the signal size for this new pilot in mBS.
    The size of the new pilot is transmitted to the upper part through the mBS, and the mBSC receiving the report sends a traffic signal to the third path of the third modulator of the unused micro channel card assembly (μCCA), signaling the user with two paths. Will receive. Currently, one μCCA supports four channels, and the channel card holds 10 μCCAs, and the system supports 40 channels. Therefore, since there are four third paths of the third modulator of each μCCA, four of them can be used to allocate traffic signals by selecting four of the remaining 36 paths.
    Transmitting and receiving in two paths, the pilot signal used in three conventional sectors is gradually lowered.
    The terminal in 8 cells recognizes the weakening pilot signal and reports the strength to the mBS. This report is reported to the upper part through the mBSC, and then the terminal reports to the upper part of the mBSC upper part again through the mBS when the terminal falls below a certain level of strength, and the base station receives the command to receive only the PN_offset to be newly grouped. Get off.
    The terminal receiving the command stops the transmission and reception of the existing PN_offset and 8 cells transmit and receive with the new PN_offset to be grouped, so that all cells have the same PN_offset and are recognized as one cell.
    Next, the method of ungrouping 8 cells again generates a PN_offset pilot signal previously provided by modulators # 0, # 1, and # 2.
    The PN_offset pilot (Cg) signal provided in the third path of modulator # 2 is the PN_offset pilot signal newly generated at each C0, C1, C2, C3, C4, C5, C6, and C7 and each cell. It is summed in the transceivers and transmitted to each of eight cells.
    Each transmitted signal is transmitted to the mBS at each cell site by the optical cable, and the mBS raises the synthesized signal to the frequency of the state through the transceiver of the mBS and transmits the signal to the terminal of each cell. .
    When the newly generated pilot signal having the existing PN_offset is output to the transceiver and the antenna of the mBS together with the grouped PN_offset pilot signal, the terminal recognizes the newly generated pilot signal of the PN_offset, At this time, when the mBSC increases the new pilot signal gradually, the terminal recognizes it and the terminal reports the signal size of the new existing pilot to the mBS.
    The mBSC is reported to the upper level through the mBS that has received the report of the size of the new pilot, and the mBSC receives the signal by assigning a traffic signal to an unused existing channel of μCCA and exchanging signals with the user through two paths.
    The terminal transmits and receives two paths, and then gradually decreases the strength of the grouped PN_offset pilots.
    The terminal in 8 cells recognizes the weakened grouped pilot signal and sends the strength to the mBS to report to the higher level. This report is reported to the upper part through the mBSC, and then the terminal is sent to the mBS again and reported to the upper level when a certain level falls below a certain level, the base station receives the command to receive only the new ungrouped PN_ offset.
    The terminal receiving this command stops the transmission and reception of grouped PN_offsets, and 8 cells transmit and receive with the new existing PN_offset, and all cells have their respective PN_offsets as before.
    According to the present invention operating as described above, as the number of microcells covers the area covered by the previous macro cell as the cell becomes smaller and smaller, a problem of frequent handover due to a high-speed driver occurs. The over will result in a cut of the arc, which degrades the quality of the arc. However, by grouping several cells as a single omnicell, handover can be suppressed to improve call quality, thereby reducing the load on the base station's call.
    In addition, by grouping and ungrouping, it is possible to rearrange the cells so that they can be variously adapted to the user's traffic requirements.
    权利要求:
    Claims (2)
    [1" claim-type="Currently amended] Generating a PN_offset pilot signal not present in three cells in a third path (Cg path) present in modulator # 2;
    PNs exiting from C0, C1, C2, C3, C4, C5, C6, and C7 that the pilot signal of the PN_offset generated in the third path (Cg path) existing in the modulator # 2 supports each of eight cells _ Adding the pilot signal of the offset and the PN_offset to be grouped in the transceiver of each cell and is transmitted to each of eight cells;
    The signal transmitted to each cell is transmitted to the mBS via the optical cable, the mBS is raised to the frequency of the air state through the transceiver of each cell and transmitted to the terminal of each cell through each mBS;
    When the pilot signal having the PN_offset to be grouped is output to the antennas (C0, C1, C2, C3, C4, C5, C6, C7) and the antenna of the mBS together with the pilot signal of the existing PN_offset, the terminal is new to be grouped. Recognizing the pilot of the strength and, at this time, if the mBSC increases the pilot signal to be grouped gradually, the terminal is aware of it and the terminal reports the signal size for this new pilot as mBS;
    The size of the new pilot is transmitted to the upper part through mBS, and the mBSC receiving this report sends a traffic signal to the third path of the third modulator of the unused micro channel card assembly (μCCA), signaling the user with two paths. Receiving process;
    Gradually reducing the pilot signal used in the existing three sectors while transmitting and receiving through the two paths;
    The terminal within 8 cells recognizes the weakened pilot signal and reports the strength to mBS, and this report is reported to the upper level through the mBSC, and when the terminal falls below a certain level of strength, the terminal falls back above the mBSC through the mBS. Reporting to the upper part of the base station and receiving the command to receive only the PN_ offset to be grouped; And
    The terminal receiving the command stops transmitting and receiving the existing PN_offset and 8 cells transmit and receive with the new PN_offset to be grouped, so that all cells have the same PN_offset and are recognized as one cell. Grouping method in micro cell environment using PN_offset
    [2" claim-type="Currently amended] Generating a pilot signal of PN_offset previously provided by modulators # 0, # 1, and # 2;
    The pilot (Cg) signal of the PN_offset provided in the third path of the modulator # 2 is a pilot signal of the PN_offset newly generated in each of C0, C1, C2, C3, C4, C5, C6, and C7. Combining the transceivers of each cell and transmitting them to each of eight cells;
    Each transmitted signal is transmitted to the mBS at each cell site by the optical cable, and the mBS step of raising the synthesized signal to the frequency of the air state through the transceiver of the mBS to send to the terminal of each cell;
    When the newly generated pilot signal having the existing PN_offset is output to the transceiver and the antenna of the mBS together with the grouped PN_offset pilot signal, the terminal recognizes the newly generated pilot signal of the PN_offset. When the mBSC increases the new pilot signal, the terminal recognizes it and the terminal reports the signal size of the new existing pilot as mBS;
    Reporting to the upper level through the reported mBS size of the new pilot, and the mBSC receiving the report sends a signal by assigning a traffic signal to an unused existing channel of μCCA to send and receive signals through two paths with a user;
    Gradually decreasing the strength of the grouped PN_offset pilot signals while the terminal transmits and receives two paths;
    The terminal within 8 cells recognizes the weakened grouped pilot signal and sends the strength to the mBS to report to the upper level, and this report is reported to the upper level through the mBSC, and then the terminal returns to the mBS when it falls below a certain level of strength. Sending a signal to a higher level, and receiving the new base station, receiving the new ungrouped PN_offset; And
    The terminal receiving this command stops the transmission and reception of grouped PN_offsets, and 8 cells transmit and receive with the new existing PN_offset, and all cells have their respective PN_offsets as before. Ungrouping method in a micro cell environment using PN_offset.
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    同族专利:
    公开号 | 公开日
    KR100290669B1|2001-07-12|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1997-12-29|Application filed by 윤종용, 삼성전자 주식회사
    1997-12-29|Priority to KR1019970076535A
    1999-07-15|Publication of KR19990056537A
    2001-07-12|Application granted
    2001-07-12|Publication of KR100290669B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019970076535A|KR100290669B1|1997-12-29|1997-12-29|Method for group and ungrouping among cells at the micro cell circumstance|
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