WO2003009618A1 - Procede de reconnaissance pour l'identification d'une cellule primaire lors de la commande de l'emission en diversite avec selection du site - Google Patents

Procede de reconnaissance pour l'identification d'une cellule primaire lors de la commande de l'emission en diversite avec selection du site Download PDF

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Publication number
WO2003009618A1
WO2003009618A1 PCT/CN2002/000088 CN0200088W WO03009618A1 WO 2003009618 A1 WO2003009618 A1 WO 2003009618A1 CN 0200088 W CN0200088 W CN 0200088W WO 03009618 A1 WO03009618 A1 WO 03009618A1
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WIPO (PCT)
Prior art keywords
primary cell
cell
base station
identifier
received
Prior art date
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PCT/CN2002/000088
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English (en)
French (fr)
Inventor
Yuehua Chen
Zhibin Zheng
Shuling Liu
Original Assignee
Huawei Technologies Co., Ltd.
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to DE60235988T priority Critical patent/DE60235988D1/de
Priority to AT02703450T priority patent/ATE464703T1/de
Priority to EP02703450A priority patent/EP1408707B1/en
Publication of WO2003009618A1 publication Critical patent/WO2003009618A1/zh
Priority to US10/734,982 priority patent/US7139576B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/143—Downlink power control

Definitions

  • the invention belongs to the technical field of mobile communication applications, and particularly relates to a method for identifying a primary cell in a base station selection diversity transmission applied to a WCDMA mobile communication system using SSDT technology.
  • SSDT Site Selective Diversity Transmit
  • SSDT Base Station Selective Diversity Transmission
  • the operation process is as follows: The UE (user equipment) selects a cell from the active set as the primary cell, and the other cells are non-primary cells.
  • the main purpose is to perform downlink transmission from the primary cell, thereby reducing interference caused by multiple transmissions in soft handover mode.
  • the second purpose is to obtain fast base station selection without network participation, thereby ensuring the advantages of soft handover.
  • each cell is assigned a temporary identifier (ID).
  • the UE periodically sends the primary cell ID for the connected cell through the uplink FBI (Feedback Indication) field.
  • the UE is selected by the UE as a non-primary cell.
  • the cell will stop transmitting.
  • the activation of the SSDT, the end of the SSDT, and the ID allocation are all performed through high-level signaling.
  • Figure 1 shows the ideal primary cell identification situation supporting SSDT technology.
  • the cell where the base station 1 is located is the real primary cell selected by the UE.
  • Base station 2, base station 3, and base station 4 are all non-primary cells located in the UE's active set.
  • the base station 1 identifies itself as the primary cell, and therefore sends downlink user data to the UE; other base stations correctly identify itself as a non-primary cell, so although it receives an uplink signal from the UE, it does not send downlink service data to the UE.
  • Rel '99 V3.7.0 of the 3GPP specification TS25. 214 specifies the conditions for a cell to determine whether it is a primary cell or a non-primary cell, as follows:
  • the UE periodically sends the ID code word of the primary cell through a part of the uplink FBI (S field of the FBI) allocated to the SSDT. If the following conditions are met at the same time, you can consider yourself a non-primary cell:
  • the received ID codeword of the primary cell does not match its own ID codeword;
  • B The received uplink signal quality meets a quality threshold Qth, which is a parameter defined by the network.
  • the use of the uplink compression mode does not cause the number of bits of the ID codeword to be lost more than an upper limit, which is (int) N ID / 3, where N ID is the length of the ID codeword.
  • the cell considers itself to be the primary cell.
  • the conditions A, B, and C described in other parts of the patent are all conditions that are directly identified as the primary cell, and are distinguished from those identified as non-primary cells in the background introduction.
  • the symbols A,, B, and C represents a condition for identifying as a non-primary cell.
  • condition ⁇ is to make only those cells that can reliably identify that the ID codeword of the cell does not match the received ID codeword regard themselves as non-primary cells. If the cell finds that the quality of the uplink signal is not good enough to ensure the reliability of the result of the matching algorithm, 'In this case, the cell will identify itself as the main cell regardless of the matching result.
  • the cell is selected by the UE as the primary cell.
  • the probability is relatively small.
  • the above situation corresponds to that in the SSDT mode, in addition to the real primary cell in the active set, some cells with poor quality are also identified as the primary cell, and some cells with good uplink signal quality in the active set are judged. It is a non-primary cell. This will cause some bad consequences, because a cell with poor quality to a certain degree (below Qth) will send a DPDCH (dedicated physical data channel) signal to the UE, which will cause greater interference to other users, but in fact the UE will The effect of the DPDCH signal in this cell is relatively small, and it is difficult to reflect SSDT The advantages.
  • DPDCH dedicated physical data channel
  • the UE may merge the DPDCH signals of the real primary cell and the cell of poor quality (Note: Poor primary cells may not contribute to the merge), compared to the case where the UE can be merged without SSDT.
  • the reception performance under SSDT will be worse. Therefore, in the above case, not only does SSDT not have the advantage of reducing interference, it may even be worse than not introducing SSDT.
  • Figure 2 illustrates this situation under the existing primary cell identification technology: base station 1 is correctly identified as the primary cell because it does not meet condition A; base station 2 is full of A,, B,, C, three non-primary cell identifications at the same time Conditions, and therefore correctly identify itself as a non-primary cell; neither the base station 3 nor the base station 4 satisfies the condition B, that is, the uplink signal quality is worse than the threshold Qth, so it judges itself as the primary cell and sends downlink service data to the UE. It can be seen that, compared with the base station 3 and the base station 4, the base station 2 may provide better signal quality but does not transmit; the signal transmission of the base station 3 and the base station 4 brings additional downlink interference. Summary of the Invention
  • the present invention improves the primary cell identification method in the SSDT technology proposed in the technical specification TS25.214 of 3GPP (Third Generation Partnership Organization), and proposes a primary cell identification method under base station selective diversity transmission, which is effective according to the present invention.
  • the optimization of the identification conditions of the main cell is performed to curb the occurrence of the bad consequences of the existing technology, and to ensure that the main cell can be selected with a relatively high probability, thereby ensuring the quality of the service and continuous transmission.
  • the technical solution adopted in the present invention is a method for identifying a primary cell in a base station selective diversity transmission, which includes the following steps:
  • the system assigns a temporary identifier (ID) to each cell;
  • the mobile station UE periodically sends an identifier ID indicating the primary cell to the connected cell through the uplink FBI (Feedback Indication) field;
  • the base station receives an identifier ID indicating the primary cell sent by the mobile station. If the signal received by the base station is sufficient for one of the following conditions, the base station considers itself to be the primary cell; the identification conditions are:
  • the identifier ID codeword representing the primary cell received by the base station matches its own identifier ID codeword
  • the quality of the uplink signal received by the base station does not meet a quality threshold.
  • This threshold is a parameter defined by the network.
  • the use of the uplink compression mode causes the number of bits of the identifier codeword to be lost more than a value, which is the largest integer not greater than 1/3 of the original identifier's word length;
  • condition (B) of step (3) should further include: a certain degree of matching between the ID codeword of the identifier of the primary cell received by the base station and the ID codeword of the cell itself.
  • FIG. 1 is a schematic diagram of the identification of an ideal primary cell supporting the SSDT technology in the prior art.
  • FIG. 2 is a schematic diagram of a situation caused by a prior art primary cell identification condition.
  • FIG. 3 is a schematic diagram of a situation caused by a primary cell identification condition of the present invention. Best Mode of the Invention
  • the present invention believes that one of the reasons for the performance degradation in the prior art is "As long as the quality of the received uplink signal does not meet a quality threshold Qth , it must identify itself as the primary cell, that is, the condition B listed above causes the The identification range of the primary cell is improper. Therefore, the present invention considers that the condition B should be improved, and the condition for identifying the non-primary cell should be relaxed by changing the condition B, and the condition for the primary cell should be further identified.
  • the present invention considers that the situation where the "received uplink signal quality does not meet a quality threshold Qth " is to be treated differently, and the difference criterion may be a degree of matching between the ID codeword of the cell and the received ID codeword. Threshold Plr. 'When the received uplink signal quality does not meet the quality threshold Q th , if the received ID code word and the ID code of the cell itself—word matching degree P is sufficiently low, that is? ⁇ ?
  • the cell does not consider itself to be the primary cell, so there is no need to send downlink data information to the UE; on the other hand, if the received ID codeword matches the ID codeword of the cell itself to a certain degree, SPP ⁇ Plr, The cell considers itself to be the primary cell.
  • a method for identifying a primary cell under base station selective diversity transmission according to the present invention includes the following steps:
  • the system assigns a temporary identifier (ID) to each cell;
  • the mobile station UE periodically sends an identifier ID indicating the primary cell to the connected cell through the uplink FBJ (Feedback Indication) field;
  • the base station receives an identifier ID indicating the primary cell sent by the mobile station. If the signal received by the base station is sufficient for one of the following conditions, the base station considers itself to be the primary cell; the identification conditions are:
  • the received identifier ID code word representing the primary cell matches its own identifier ID code word.
  • B. The quality of the uplink signal received by the base station does not meet the quality threshold Q th described by the quality threshold.
  • the identifier ID codeword representing the primary cell and the ID codeword of the cell received by the base station are: A certain degree of matching; the degree of matching means that the received degree P of the identifier ID code representing the primary cell and the local cell ID code is greater than or equal to a specific threshold value Plr; the threshold value r is set by a higher layer set.
  • the redundancy information can be used to extract the matching degree P between the ID of the received cell and the ID of the own cell, where P is equal to the ID codeword received and the ID.
  • the distance d between the cell ID codewords is inversely proportional. If the matching degree is small, it can indicate that the probability that the local cell is a true primary cell is small.
  • Fig. 3 shows a modification of the prior art by the present invention.
  • Base station 1 was correctly identified as the primary cell because it satisfies condition A; the two primary cell identification conditions of pair 2, B, and C were not met, so it identified itself as a non-primary cell; both base station 3 and base station 4 met condition B
  • the "Received uplink signal quality does not meet the quality threshold Q th ", but through the comparison of the matching degree, the matching degree of base station 3? 1! ", Then the base station 3 is still judged as a non-primary cell; If the matching degree P ⁇ Plr of the base station 4 is determined as the primary cell, compared with FIG. 2, it can be seen that the base station 3 is further limited to a non-primary cell, and an additional downlink transmission interference is reduced.
  • the ID code matching degree P can also be used for the judgment of condition A "the received primary cell ID code word matches its own ID code word". If P is used for both the judgment of condition A and the judgment of the relationship between P and Plr in condition B, suppose the threshold used in condition A is Pa. If BPP ⁇ Pa is satisfied, then condition A must be satisfied. Failure to satisfy this relationship will render the received signal quality threshold Qth ineffective. This situation is equivalent to setting two thresholds for the matching value P, and each threshold is used for two different conditions, A and B.
  • the primary cell is aggregated.
  • the main cell is composed of 1) Regardless of the quality of the uplink received signal, the cell whose received codeword matches the ID code of the cell highly
  • the present invention improves the restriction conditions of non-primary cell identification in the existing SSDT technology. Under the premise that the primary cell is not affected to be correctly identified, the transmission of non-primary cells with very poor quality to the UE is largely avoided. Signals, thereby reducing system interference and improving system stability and system capacity.
  • the system encodes the ID code assigned by the base station.
  • the method is shown in the following table.
  • the following table is the method for setting the ID code of the 1-bit FBI: Table 1 Setting the ID code of the 1-bit FBI
  • the cells in the eight activation sets correspond to eight ID identifiers (labels), and each ID label has three code lengths: long, medium, and short.
  • condition A The determination method of condition A "The received ID codeword of the primary cell matches its own ID codeword": The determination method of condition A is specified as follows: A hard decision is made on all ID codewords received. The result of the hard decision of no more than X bits does not meet the ID codeword of the cell, it is considered that the condition A is established.
  • the short, medium, and long code lengths can be taken as 1, 2, and 4, respectively.
  • Prescribed condition B "The quality of the received uplink signal does not meet a quality threshold Q th .
  • This threshold is a parameter defined by the network.
  • the matching degree P between the received ID code and the ID code of the cell is not lower than a certain value.
  • Threshold Plr can also be set by a higher-level decision method.
  • the measurement method and threshold value of the received uplink signal quality Q are not the key points of the present invention, and any method that meets the requirements of the specification may be used, and is not detailed in this embodiment.
  • the calculation of the "matching value P between the received ID code and the ID code of the local cell" may be specified as follows: Hard decision is made on all the received ID code words, and the value of P is the bit sequence of the decision result and the local cell's The corresponding bits in the ID code sequence take different numbers.
  • condition A that is, the hard decision result of the received ID code sequence is less than X bits of the ID code of the cell, then the cell is identified as the master cell, and skip to step 5; Otherwise, go to step 2.
  • step 4 If (P ⁇ Plr), the cell is identified as a non-primary cell and skip to step 5; otherwise, perform step 4. d. The cell is identified as the primary cell, and step 5 is performed.
  • the present invention divides the cells whose uplink signal quality is lower than the threshold value, and limits the cell ID that is considered to have a certain degree of matching with the received ID, it judges itself as the main cell. If this degree of matching is insufficient, It is still judged as a non-primary cell, so that on the one hand, it avoids identifying the primary cell as long as the uplink signal quality is poor enough in the prior art, thereby greatly reducing the opportunity for additional downlink signal interference; on the other hand, the uplink signal quality is poor. Time protection protects the identification of the real primary cell that still has a certain degree of matching, thereby reasonably ensuring the continuous transmission of signals.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Description

一种基站选择分集发射下的主小区识别方法 技术领域
本发明属于移动通信应用技术领域， 尤其涉及应用于使用了 SSDT技术的 WCDMA 移动通信系统的基站选择分集发射下的主小区识别方法。 背景技术
SSDT (Site Selective Diversity Transmit 基站选择分集发射） 技术是先 进移动通信系统中的重要技术之一， 主小区的正确识别是影响 SSDT技术性能的一 个重要步骤。 ' 基站选择分集发射（SSDT)是软切换下的一个宏分集方法。 操作过程如下： UE (用户设备）从激活集中选择一个小区作为主（primary) 小区， 其它小区为非 主（non primary) 小区。 主要目的是从主小区进行下行发射， 从而降低在软切换 模式下多发射带来的干扰。 第二个目的是在没有网络参与下获得快速基站选择， 从而保证软切换的优势。 为了选择一个主小区， 给每个小区都分配一个临时标识 符 （ID)， UE周期性地通过上行 FBI (反馈指示）字段为所连接的小区发送主小区 ID, 被 UE选择为非主小区的小区将停止发射。 SSDT的激活、 SSDT的结束和 ID的分配都 通过高层信令进行。
图 1 表示了支持 SSDT技术的理想的主小区识别情况。 其中， 基站 1所在的小 区是 UE所选定的真正的主小区。 基站 2、 基站 3和基站 4都是位于 UE的激活集中的非 主小区。 图 1中， 基站 1识别自己为主小区， 因此向 UE发送下行用户数据； 其它基 站正确识别出自己为非主小区， 因此虽然接收 UE发出的上行信号， 但不向 UE发送 下行业务数据。
3GPP规范 TS25. 214 的 Rel' 99 V3. 7. 0中规定了一个小区判定自己是主小区还 是非主小区的条件， 规定如下： ·
UE通过分配给 SSDT的上行 FBI的一部分 （FBI的 S字段） 周期性地发送主小区 的 ID码字。 如果同时满足以下几个条件， 则可以认为自己是非主小区：
A， 、 接收到的主小区 ID码字与自己的 ID码字不匹配； B， 、 接收到的上行信号质量满足一个质量门限 Qth， 这个门限是由网络定义 的参数。
C， 、 上行压缩模式的使用没有引起 ID码字丢失的比特数超过一个上限， 该上限为（int) NID/3， 其中 NID是 ID码字的长度。
否则， 小区认为自己是主小区。
特别指出， 专利其它部分所阐述的条件 A、 B和 C都是直接识别为主小区的条 件， 为和背景技术介绍中识别为非主小区的条件相区别， 这里以符号 A， 、 B， 和 C， 表示识别为非主小区的条件。
可以看到， SSDT模式下， 小区判断自己是非主小区的条件是比较严格的， 判 断自己是主小区的条件相对宽松， 这样做的目的是为了尽可能避免出现没有任何 —个小区认为自己是主小区的情况。 在软切换的 SSDT模式下， 一旦没有主小区， 将直接导致没有小区向 UE发送业务数据， 造成数据的丢失以及传输信息质量的下 降。
需特别说明的是， 其中条件^ 的目的是仅使那些能可靠地识别出本小区的 ID 码字与接收到的 ID码字不匹配的小区将自己作为非主小区。 如果小区发现上行信 号质量不够好， 不足以保证匹配算法结果的可靠性， '这种情况下不论匹配结果如 何， 小区都将自己识别为主小区。
现有的主小区识别技术认为， 小区如果同时满足前 ¾A， 、. B， 、 C 三个条 件， 则小区将自己识别为非主小区。 其中 B， 条件的作用是保证小区将自己判断为 非主小区的可靠性。 但由此会引起下述不适当的情况发生： 如果一个小区收到的 上行信号质量不满足门限 Qth， 也就是说当上行信号处于一个比较差的状况下时， 该小区将一定将自己判为主小区。 而实际上， 如果我们把各小区与 UE之间的传播 距离差异看作 UE与激活集内各小区的上下行链路质量差异的一个重要影响因素， 则该小区被 UE选定为主小区的可能性是相对比较小的。
上述情况对应于在 SSDT模式下， 激活集内除了真正的主小区外， 某些质量很 差的小区也被识别为主小区， 而激活集内某些上行信号质量比较好的小区， 才被 判为非主小区。 这样会造成一些不良后果， 因为质量差到一定程度（低于 Qth) 的 小区将向 UE发送 DPDCH (专用物理数据信道）信号， 该信号会对其它用户造成较大 干扰， 而实际上对于 UE而 s该小区的 DPDCH信号的作用相对很小， 难以体现出 SSDT 的优势。 另一方面， 这种情况下， UE可能合并真正的主小区和质量很差的小区的 DPDCH信号（注： 差的主小区有可能在合并中没有贡献） ， 相对于没有 SSDT条件下 UE可以合并激活集内多个小区信号的情况， SSDT下的接收性能会更差。 因此上述 情况下， 不仅没有体现出 SSDT降低干扰的优势， 甚至有可能比不引入 SSDT还坏。
图 2解释了现有主小区识别技术下的这种情况： 基站 1因不满足条件 A， 而被 正确识别为主小区； 基站 2同时满 A， 、 B， 、 C， 三个非主小区识别条件， 因此 将自己正确识别为非主小区； 基站 3和基站 4都未满足条件 B, 即上行信号质量差于 门限 Qth， 因此将自己判为主小区， 向 UE发送下行业务数据。 可以看到， 相对基站 3和基站 4来说， 基站 2有可能提供更好的信号质量， 但没有发射； 基站 3和基站 4的 信号发射带来了额外的下行干扰。 发明内容
本发明针对 3GPP (第三代伙伴组织） 的技术规范 TS25. 214中提出的 SSDT技术 中的主小区识别方法进行了改进， 提出了基站选择分集发射下的主小区识别方法， 按照本发明能有效遏制现有技术恶劣后果的发生而进行的主小区识别条件的优 化， 保证能以比较大的概率选出主小区， 从而保证业务的质量和连续传输。
为了实现本发明的目 ^， 本发明采用的技术方案是， 一种基站选择分集发射 下的主小区识别方法， 包括以下步骤：
(1)系统给每个小区分配一个临时标识符（ID);
(2)移动台 UE周期性地通过上行 FBI (反馈指示）字段向所连接的小区发送表 示主小区的标识符 ID;
(3)基站接收移动台发送的表示主小区的标识符 ID， 如果基站接收到的信号满 足以下条件之一， 则该基站认为自己是主小区； 识别条件为：
A、 基站接收到的表示主小区的标识符 ID码字与自己的标识符 ID码字匹配；
B, 基站接收到的上行信号质量未满足一个质量门限 这个门限是由网络' 定义的参数；
C 、 上行压缩模式的使用引起标识符码字丢失的比特数超过一个值， 该值是 不大于原标识符 ¾¾字长度的 1/3的最大整数；
其特点是， 所述的步骤 (3)的 B条件中还应包括： 基站接收的表示主小区的标 识符 ID码字与小区本身的 ID码字的有一定的匹配度。 上述一种基站选择分集发射下的主小区识别方法， 其中， 步骤 (3)的 B条件中 所述的匹配度是指收到的表示主小区的标识符 Π码与本小区 ID码的匹配度 P大于 等于一个特定的门限值 Plr。
上述一种基站选择分集发射下的主小区识别方法， 其中， 步骤 (3)的 B条件中 所述的门限值 Plr由高层设定。 附图概述
本发明的具体特征、 性能由以下的实施例及其附图进一步描述。
图 1是现有技术支持 SSDT技术的理想的主小区识别情况示意图。
图 2是现有技术主小区识别条件所导致的一种情况示意图。
图 3是本发明主小区识别条件所导致的情况示意图。 本发明的最佳实施方式
本发明认为， 现有技术造成性能恶化的一个原因是 "只要接收的上行信号质 量不满足一个质量门限 Qth， 就一定将自己识别为主小区，， ， 也就是前面列出的条 件 B造成对主小区的识别范围不当。 因此本发明认为应对条件 B进行完善， 通过对 条件 B的更改放宽识别为非主小区的条件， 同时进一步严格识别为主小区的条件。
本发明根据上述分析认为， 对 "接收的上行信号质量不满足一个质量门限 Qth" 的情况要区别对待， 区别的标准可以是一个表示本小区 ID码字与所接收到的 ID码字匹配度的门限值 Plr。'当发生接收的上行信号质量不满足质量门限 Qth时， 如果接收的 ID码字与小区本身的 ID码―字匹配度 P足够低， 即？〈？1]：, 则小区不认为 自己是主小区， 从而无需向 UE发送下行数据信息； 反之， 如果接收的工 D码字与小 区本身的 ID码字的尚有一定的匹配度， SPP^Plr, 小区则认为自己是主小区。
本发明一种基站选择分集发射下的主小区识别方法， 包括以下步骤：
(1)系统给每个小区分配一个临时标识符（ID);
(2)移动台 UE周期性地通过上行 FBJ (反馈指示）字段向所连接的小区发送表 示主小区的标识符 ID;
(3)基站接收移动台发送的表示主小区的标识符 ID， 如果基站接收到的信号满 足以下条件之一， 则该基站认为自己是主小区； 识别条件为：
A、 接收到的表示主小区的标识符 ID码字与自己的标识符 ID码字匹配。 B、 基站接收到的上行信号质量未满足 个质量门限 所述的质量门限 Qth 由网络定义的参数；同时，基站接收的表示主小区的标识符 ID码字与小区本身的 ID 码字的有一定的匹配度； 该匹配度是指收到的表示主小区的标识符 ID码与本小区 ID码的匹配度 P大于等于一个特定的门限值 Plr; 所述的门限值 r由高层设定。
C 、 上行压缩模式的使用引起 ID码字丢失的比特数超过一个上限， 该上限为 (int) Nro/3, 其中 Nro是 ID码字的长度。
因为小区的 ID码字是一个经过编码增加了冗余的结果， 可以利用该冗余信息 提取出所接收的小区的 ID与本小区的 ID的匹配度 P， P与收到的 ID码字与本小区 ID 码字之间的距离 d成反比。 如果匹配度很小， 则可以表示本小区是真正的主小区的 概率很小。
图 3表示本发明对现有技术的改进。 基站 1因满足条件 A而被正确识别为主小 区； 基站 2对 、 B、 C三个主小区识别条件都不满足， 因此将自己正确识别为非主 小区； 基站 3和基站 4都满足条件 B中的 "接收的上行信号质量未满足质量门限 Qth" 部分， 但通过匹配度比较， 基站 3的匹配度? 1!", 则基站 3仍判为非主小区； 由于 信号传播中的误码， 基站 4的匹配度 P ^Plr, 则基站 4判为主小区。 与图 2相比， 可以看出， 基站 3被进一步限定为非主小区， 减少了一份额外的下行发射干扰。
另外需特别指出， ID码匹配度 P也可以用于条件 A "接收到的主小区 ID码字 与自己的 ID码字匹配" 的判决。 如果 P同时用于条件 A的判决和条件 B中 P与 Plr关系 的判决， 设在条件 A中所使用的门限值为 Pa， BPP^Pa则条件 A成立， 则应满足 Pa>Plr, 如不满足该关系， 就会使接收信号质量门限 Qth失去作用。 这种情况相当 于对匹配度值 P设了双门限， 各门限用于 A、 B两个不同的条件。
本发明与已有技术相比， 其优点是明显的：
在不考虑压缩模式的特殊处理， 即不考虑前述的条件 C， 则不釆用本发明的 技术时， 主小区由集合
1 ) 不论上行接收信号质量如何， 接收的码字与本小区的 ID码高度匹配的小 区
和
2)上行接收到的信号质量低于门限 Qth的小区
共同组成。
而采用了本发明后， 主小区由集合 1 ) 不论上行接收信号质量如何， 接收的码字与本小区的 ID码高度匹配的小 区
和
2)上行接收到的信号质量低于门限 Qth的小区中尚有一定匹配度的小区 共同组成。
因此通过本发明对现有 SSDT技术中非主小区识别的限制条件的改进， 在基本 不影响主小区被正确识别的前提下，很大程度上避免了质羞非常差的非主小区向 UE 发射信号， 从而降低了系统干扰， 提高了系统稳定性和系统容量。
下面再通过一个 WCDMA的 FDD系统中针对 FBI域为 1比特的情况的实施例对本发 明的特征作进一步说明。
1 ) 系统对基站分配 ID码的进行编码， 其方法请见下表， 下表是对 1比特 FBI 的 ID码设置的方法： 表 1 对 1比特 FBI的 ID码设置
Figure imgf000008_0001
由上表可以看出， 8个激活集中的小区分别对应 8个 ID标识符 (label) , 每个 ID label有长、 中、 短三种码长。
2)规定条件 A "接收到的主小区 ID码字与自己的 ID码字匹配" 的判决方法： 将条件 A的判决方法规定为： 对收到的所有 ID码字进行硬判决， 其中只要有 不多于 X个比特的硬判决结果不符合本小区的 ID码字， 就认为条件 A成立， 这里可 取短、 中、 长码长时 X分别取 1， 2， 4。 条件 A的判决方法可以有多种， 包括软判决、 硬判决、 设定门限等等， 具体 判决方法的选择依赖于实现。
3)规定条件 B "接收到的上行信号质量不满足一个质量门限 Qth， 这个门限是 由网络定义的参数， 同时， 收到的 ID码与本小区 ID码的匹配度 P不低于某个门限 Plr, 门限 Plr也可由高层设定" 的判决方法。
对接收到的上行信号质量 Q的测量方法及其门限值， 不是本发明的关键点， 选用符合规范要求的任何方法都可， 本实施例中不作细化。
"收到的 ID码与本小区 ID码的匹配度值 P" 的计算可规定为： 对收到的所有 ID 码字进行硬判决， P的取值即为判决结果的比特序列与本小区的 ID码序列中的对应 比特取值不同的个数。
Plr可规定为： 对长码长， Plr=8; 对中等码长， Plr=4; 对短码长， Plr二 3。
4)本实施例假设不发生上行压缩的情况， 即步骤 5 ) 中的分析不考虑条件 C 的影响。
5)根据步骤 1 )至步骤 4) ， 主小区和非主小区的识别情况如下：
a、 如果， 条件 A为真， 即收到的 ID码的序列的硬判决结果与本小区的 ID码只 有少于 X个比特不一致， 那么， 该小区被识别为主小区， 跳到步骤 5; 否则执行步 骤 2。
b、 如果 （Q>=Qth)， 则该小区被识别为非主小区， 跳到步骤 5; 否则执行步骤
3。
c、如果 （P<Plr)， 则该小区被识别为非主小区， 跳到步骤 5; 否则执行步骤 4。 d、 该小区被识别为主小区， 执行步骤 5。
识别过程结束。 工业应用性
由于本发明对上行信号质量低于门限值的小区进行了划分， 并限定其中认为 本小区 ID与接收的 ID尚有一定匹配度的则将自己判为主小区， 如果不够此匹配度， 就仍判为非主小区， 这样一方面避免了现有技术中只要上行信号质量足够差就必 定识别为主小区， 从而大大减少额外增加下行信号干扰的机会； 另一方面又在上 行信号质量不佳时保护了对尚有一定匹配程度的真正的主小区的识别， 从而合理 地保证了信号的连续传输。

Claims

权 利 要 求
1、 一种基站选择分集发射下的主小区识别方法， 包括以下步骤：
(1)系统给每个小区分配一个临时标识符；
(2)移动台周期性地通过上行反馈指示字段向所连接的小区发送表示主小区的 标识符；
(3)基站接收移动台发送的表示主小区的标识符， 如果基站接收到的信号满足 以下条件之一， 则该基站认为自己是主小区； 识别条件为：
A、 基站接收到的表示主小区的标识符码字与自己的标识符码字匹配；
B、 基站接收到的上行信号质量未满足一个质量门限， 这个门限是由网络定 义的参数； '
C 、 上行压縮模式的使用引起标识符码字丢失的比特数超过一个值， 该值是 不大于原标识符码字长度的 1/3的最大整数；
其特征在于， 所述的步骤 (3)的 B条件中还应包括： 基站接收的表示主小区的 标识符码字与小区本身的标识符码字有一定的匹配度。
2、 根据权利要求 1所述的一种基站选择分集发射下的主小区识别方法， 其特 征在于， 步骤 (3)的 B条件中所述的匹配度是指收到的表示主小区的标识符码与本 小区标识符码的匹配度 P大于等于一个特定的门限值 Pk。
3、 根据权利要求 2所述的一种基站选择分集发射下的主小区识别方法， 其特 征在于， 步骤 (3)的 B条件中所述的门限值 Plr由高层设定。
PCT/CN2002/000088 2001-07-18 2002-02-10 Procede de reconnaissance pour l'identification d'une cellule primaire lors de la commande de l'emission en diversite avec selection du site WO2003009618A1 (fr)

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