WO2012109916A1 - 一种高速下行分组接入系统服务小区选择方法及装置 - Google Patents

一种高速下行分组接入系统服务小区选择方法及装置 Download PDF

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Publication number
WO2012109916A1
WO2012109916A1 PCT/CN2011/081278 CN2011081278W WO2012109916A1 WO 2012109916 A1 WO2012109916 A1 WO 2012109916A1 CN 2011081278 W CN2011081278 W CN 2011081278W WO 2012109916 A1 WO2012109916 A1 WO 2012109916A1
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signal quality
cell
user equipment
threshold
serving cell
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PCT/CN2011/081278
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English (en)
French (fr)
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黄河
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中兴通讯股份有限公司
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Publication of WO2012109916A1 publication Critical patent/WO2012109916A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data

Definitions

  • the present invention relates to a Wideband Code Division Multiple Access (WCDMA) mobile communication technology, and in particular to a method and apparatus for selecting a serving cell in a WCDMA system using High Speed Downlink Packet Access (HSDPA) technology.
  • WCDMA Wideband Code Division Multiple Access
  • HSDPA High Speed Downlink Packet Access
  • a user equipment or a user equipment reports the downlink pilot of the detected cell of the UE to the RNC under the control of a Radio Network Controller (RNC). Signal strength or quality. Based on the downlink pilot signal strength or quality of these cells, the RNC can decide whether to change the current serving cell of the UE. Generally, the RNC uses the cell with the best downlink signal strength or quality as the serving cell of the UE, and transmits data to the UE through the High Speed Physical Shared Channel (HS-PDSCH) of the serving cell.
  • HS-PDSCH High Speed Physical Shared Channel
  • the UE also has a dedicated physical channel in the uplink and downlink directions with the serving cell and other cells in the active set.
  • the cells in the active set may belong to one or more NodeBs.
  • the UE feeds back the channel quality indicator (CQI, Channel Quality Indicator) and the indication that the downlink data packet is received correctly (Ack) or incorrect (Nack) to the cell in the active set.
  • CQI Channel Quality Indicator
  • the NodeB controlling the serving cell determines, according to the CQI, which encoding and modulation mode to use when transmitting data to the UE for the next time; if the NodeB receives the Nack indication, that is, the UE does not correctly receive the transmitted data, the NodeB according to the network side
  • the parameter of the configured Hybrid Automatic Repeat Request ( HARQ, Hybrid Automatic Repeat Request) determines to send the data that is not correctly received to the UE again.
  • the cell with the best downlink signal strength or quality received by the UE may be different from the best cell with the uplink signal quality of the received UE. That is, for the UE, the strength or quality of the downlink pilot signal detected by the serving cell is the best among all active set cells; and for the cell in the active set, the uplink signal strength or quality of the UE received by the serving cell Not all activation sets The best in the community. For simplicity of description, it is assumed here that the serving cell is cell A, and the cell with the best uplink signal strength or quality is cell B.
  • Scenario 1 When the cell A and the cell B are not in the same cell but belong to the same NodeB, the NodeB that provides the downlink HSDPA service for the UE
  • the error rate of the uplink CQI and Ack or Nack information obtained by the cell B is the same as the error rate of the uplink CQI and Ack or Nack information obtained when the cell A and the cell B are the same cell, and is also obtained by all the active set cells.
  • the uplink CQI and Ack/Nack information have the lowest bit error rate.
  • Scenario 2 When the cell A and the cell B do not belong to the same NodeB, the error rate of the uplink CQI and Ack or Nack information obtained by the NodeB that provides the downlink HSDPA service for the UE from the cell A is higher than the uplink CQI and Ack obtained by the cell B. Or the bit error rate of the Nack information.
  • scenario 2 occurs after the serving cell changes, the possible consequences are:
  • the downlink channel strength and quality are better than before the serving cell changes, but the uplink channel error rate detected by the NodeB controlling the serving cell is changed from the serving cell.
  • the former is higher, causing more retransmissions in the downlink, resulting in lower downlink throughput of the serving cell than before the serving cell is changed.
  • the technical problem to be solved by the present invention is to provide a method and apparatus for selecting a serving cell of a high speed downlink packet access system, so as to avoid a lower downlink throughput of the changed serving cell than before the serving cell is changed.
  • the present invention provides a method for selecting a service area of a high speed downlink packet access system, including:
  • the radio network controller acquires the downlink signal quality of the neighboring cell of the user equipment, and the uplink signal quality of the neighboring cell of the user equipment belonging to the active set, A cell in which the downlink signal quality of the neighboring cell of the user equipment meets the first threshold requirement and meets any of the following conditions is used as the serving cell of the user equipment: a) the cell with the downlink signal quality meeting the first threshold requirement and the uplink signal quality are satisfied.
  • the cells required by the second threshold belong to the same base station (NodeB); b) The uplink signal quality of the cell whose downlink signal quality meets the first threshold requirement satisfies the third threshold requirement.
  • the first threshold is required to select a cell in which the downlink signal quality of the neighboring cell of the user equipment is higher than the downlink signal quality of the current serving cell and the downlink signal quality is the best.
  • the second threshold is to select a cell with the best uplink signal quality in the neighboring cell of the user equipment that belongs to the active set, or set the second threshold to ensure that the base station correctly demodulates the channel quality sent by the user equipment.
  • the third threshold is an uplink signal quality that is required by the base station to correctly demodulate the channel quality indication and the error rate of the feedback indication sent by the user equipment.
  • condition a) is determined first, and then The judgment of condition b).
  • the downlink signal quality is represented by a signal power of a common pilot channel (CPICH); the uplink channel quality is represented by an uplink received total broadband power (RTWP).
  • CPICH common pilot channel
  • RWP uplink received total broadband power
  • the present invention further provides a high speed downlink packet access system serving cell selection device, which is located in a radio network controller (RNC), and includes:
  • a first module configured to: obtain a downlink signal quality of a neighboring cell of the user equipment, and an uplink signal quality of an adjacent cell of the user equipment that belongs to the active set in the process of selecting a serving cell for the user equipment;
  • a second module configured to: select, as the serving cell of the user equipment, a cell in which the downlink signal quality of the user equipment neighboring cell meets the first threshold requirement and meets any of the following conditions: a) the downlink signal quality meets the A cell with a threshold requirement and a cell whose uplink signal quality meets the second threshold requirement belong to the same base station (NodeB);
  • the first threshold requirement is that the downlink signal quality of the neighboring cell of the user equipment is higher than the downlink signal quality of the current serving cell, and the downlink signal quality is the best.
  • the second threshold is to select a cell with the best uplink signal quality in the neighboring cell of the user equipment that belongs to the active set, or set the second threshold to ensure that the base station correctly demodulates the channel quality sent by the user equipment.
  • the third threshold is an uplink signal quality that is required by the base station to correctly demodulate the channel quality indication and the error rate of the feedback indication sent by the user equipment.
  • the embodiment of the present invention not only selects the downlink signal quality to be better than the neighboring cell of the current serving cell as the new serving cell, but also determines that the uplink load or the uplink signal quality of the neighboring cell does not cause the downlink throughput to decrease, and thus can be compared with the prior art. Better improve the throughput of HSDPA services after the service cell changes.
  • Figure 1 is a flow chart of an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a relationship between a serving cell and a candidate cell according to an embodiment of the present invention.
  • the solution of the present invention in the process of selecting a serving cell for the user equipment, the radio network controller (RNC) acquires the downlink signal quality of the neighboring cell of the user equipment, and the uplink signal of the neighboring cell of the user equipment belonging to the active set. Quality, the cell in which the downlink signal quality of the neighboring cell of the user equipment meets the first threshold requirement and meets any of the following conditions is selected as the serving cell of the user equipment:
  • the condition related to the uplink signal quality is added when the serving cell is selected, it can be avoided.
  • the downlink throughput of the serving cell after the change is not lower than that of the serving cell before the change, and the throughput of the HSDPA service after the change of the serving cell can be better improved than the prior art.
  • the foregoing method for selecting a serving cell may be applied to initially select a serving cell for the user equipment, and may also be used to replace the current serving cell for the user equipment.
  • the first threshold requirement may be that the cell with the best downlink signal quality in the neighboring cell of the user equipment is selected.
  • the first threshold requirement may be a cell in which the downlink signal quality of the neighboring cell of the user equipment is higher than the downlink signal quality of the current serving cell and the downlink signal quality is the best. It is a preferred mode to select the cell with the best downlink signal quality among the above threshold requirements, and other methods may be used, for example, selecting a cell with a lower downlink signal quality.
  • the cell satisfying the first threshold requirement and the cell whose uplink signal quality meets the second threshold requirement may not be the same cell.
  • the second threshold requirement may be: selecting a cell with the best uplink signal quality in the neighboring cell of the user equipment that belongs to the active set, or setting the second threshold to ensure that the base station correctly demodulates the channel quality indicator and the feedback indication sent by the user equipment.
  • the uplink signal quality required by the bit error rate, the feedback indication includes: a correct indication of the data packet reception, or an incorrect indication of the data packet reception.
  • the cell that meets the first threshold requirement and the cell whose uplink signal quality meets the third threshold requirement are the same cell, that is, the cell serving as the serving cell should meet the third threshold requirement in addition to the first threshold requirement.
  • the third threshold requirement may be the same as or different from the second threshold requirement, but the principle of setting is still to ensure that the base station correctly demodulates the channel quality indication and the error rate requirement of the feedback indication sent by the user equipment.
  • the condition 1) is judged first, and when the condition 1) is not satisfied, the condition 2) is judged.
  • the downlink signal quality may be represented by the signal power of the Common Pilot Channel (CPICH) (also referred to as the received power of the CPICH); the uplink channel quality may be represented by the Received Total Received Wideband Power (RTWP). .
  • CPICH Common Pilot Channel
  • RWP Received Total Received Wideband Power
  • the serving cell selection device implementing the above method is located at the RNC and includes:
  • a first module configured to acquire the user equipment in the process of selecting a serving cell for the user equipment The downlink signal quality of the neighboring cell, and the uplink signal quality of the neighboring cell of the user equipment belonging to the active set;
  • a second module configured to select, as the serving cell of the user equipment, a cell in which the downlink signal quality of the user equipment neighboring cell meets the first threshold requirement and meets any one of the following conditions:
  • the present invention is described below by way of an example.
  • the following example mainly replaces the scenario of the current service area.
  • the process may be performed. As shown in Figure 1, the following steps are included:
  • Step 10 The mobile terminal detects the downlink signal quality of the neighboring cell, and reports the detection result to the radio network controller (RNC).
  • RNC radio network controller
  • the downlink signal quality of the neighboring cell is preferably a common pilot channel (CPICH, of the neighboring cell).
  • CPICH common pilot channel
  • the signal power of the Common Pilot Channel also known as the received power of the CPICH.
  • the foregoing neighboring cells include an active set cell and an inactive set cell.
  • Step 20 The RNC obtains, from the Node B (NodeB), the uplink channel quality of the neighboring cell that reports the downlink signal quality to the RNC by the mobile terminal in step 10;
  • the uplink channel quality of the foregoing neighboring cell is preferably the uplink receiving total broadband power of the neighboring cell.
  • the RNC may only obtain the uplink channel quality of the neighboring cells belonging to the active set and the mobile terminal reporting the downlink signal quality to the RNC.
  • This step is not limited to being performed at this time, as long as it is performed before step 50.
  • Step 30 The RNC compares the downlink signal quality of each neighboring cell according to the measurement result reported in step 10, and puts the neighboring cell whose downlink signal quality is better than the downlink signal quality of the current HS-PDSCH serving cell into the candidate serving cell set, and performs steps. 40; When the quality of the common pilot signal of the neighboring cell is higher than the current serving cell of the mobile subscriber, it indicates that the signal quality of the neighboring cell is better than the signal quality of the current serving cell at the location where the current mobile subscriber is located.
  • the candidate service cell set is constructed in this step in order to make the subsequent decision description more concise. In other embodiments, the candidate serving cell set may not be constructed.
  • Step 40 the RNC determines whether the candidate serving cell set is empty: if it is empty, step 10 is performed, otherwise step 50 is performed;
  • Step 50 The RNC determines whether the cell with the best downlink signal quality in the candidate serving cell set and the cell with the best uplink channel quality in the current active set (that is, the lowest uplink load) belong to the same NodeB. If they belong to the same NodeB, the RNC performs Step 90, otherwise, step 60 is performed; the higher the uplink RTWP of the cell indicates that the uplink load of the cell is heavier, and the lower the RTWP is, the lighter the uplink load of the cell is.
  • Step 60 The RNC determines whether the uplink channel quality of the neighboring cell with the best downlink signal quality in the candidate serving cell set satisfies the channel quality indication sent by the base station to correctly demodulate the mobile station and the error rate requirement of the feedback indication: if yes, perform the step 90, otherwise, perform step 70;
  • Step 70 The neighbor cell with the best downlink signal quality in the current candidate cell set is deleted from the candidate service cell set, and step 80 is performed;
  • Step 80 it is determined whether the current candidate serving cell set is empty, if it is empty, step 100 is performed, otherwise step 50 is performed;
  • Step 90 Select a cell with the best downlink signal quality in the candidate serving cell set as a new serving cell of the mobile terminal;
  • Step 100 Select a downlink signal quality that is better than a neighboring cell of the current HS-PDSCH serving cell as a new serving cell.
  • selecting a neighboring cell with the downlink signal quality that is better than the downlink signal quality of the current HS-PDSCH serving cell is the new serving cell, or arbitrarily selecting a downlink signal quality lower than the current HS-PDSCH serving cell.
  • the neighboring area with good signal quality serves as a new serving cell.
  • the cell 1 (Cell 1) is the current serving cell of the user equipment (User Equipment, UE); the Celll and the Cell2 are both controlled by the base station (NodeB) 1, and the UE only has a link with the Celll, that is, only the Celll is activated in the active set.
  • UE User Equipment
  • NodeB base station
  • Cell3 and Cell4 are neighbors of Celll and Cell2, which are controlled by base stations NodeB2 and NodeB3, respectively.
  • the base stations NodeBl, NodeB2 and NodeB3 are all controlled by the same RNC.
  • the UE monitors the signals of Cell2, Cell3, and Cell4, and measures the quality of the common pilot signal of each cell and reports it to the RNC.
  • the RNC obtains the RTWPs of Celll, Cell2 and Cell3 from the base stations NodeB1, NodeB2 and NodeB3;
  • the RNC reports the common pilot signal quality of Cell2 and Cell3 according to the common pilot signal quality reports of Cell2, Cell3 and Cell4, and finds that the common pilot signal quality of Cell2 and Cell3 is better than Celll, so Cell2 and Cell3 are put into the candidate serving cell set;
  • the RNC finds that the common pilot signal quality of Cell2 is higher than that of Cell3, and it is found that both Cell2 and Celll are controlled by NodeB1, and Cell2 is the lowest in active set RTWP.
  • the cell that is, the cell with the best quality of the centralized uplink channel is activated, so Cell2 is selected as the new serving cell of the UE.
  • the UE monitors the signals of Cell2, Cell3, and Cell4, and measures the quality of the common pilot signal of each cell and reports it to the RNC.
  • the RNC obtains the RTWPs of Celll, Cell2 and Cell3 from the base stations NodeB1, NodeB2 and NodeB3;
  • the RNC reports that the common pilot signal quality of Cell2 and Cell3 is better than that of Celll according to the common pilot signal quality report results of Cell2, Cell3, and Cell4, so that Cell2 and Cell3 are placed in the candidate serving cell set;
  • Step 4 Based on the common pilot signal quality report results of Cell2 and Cell3, the RNC finds that the common pilot signal quality of Cell3 is higher than that of Cell2. It is found that Cell3 and Celll are controlled by different NodeBs, but the RTWP of Cell3 is found through the measurement report.
  • the base station correctly demodulates the channel quality indication sent by the mobile user and the error rate requirement of the feedback indication, and therefore selects Cell3 as the new serving cell of the UE.
  • the embodiment of the present invention not only selects the downlink signal quality to be better than the neighboring cell of the current serving cell as the new serving cell, but also determines that the uplink load or the uplink signal quality of the neighboring cell does not cause the downlink throughput to decrease, so The technology can better improve the throughput of the changed HSDPA service in the serving cell.

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Abstract

高速下行分组接入系统服务小区选择方法及装置，避免出现变更后的服务小区的下行吞吐量比服务小区变更前更低。该方法包括：在为用户设备选择服务小区过程中，无线网络控制器（RNC）获取该用户设备的相邻小区的下行信号质量以及属于激活集的该用户设备的相邻小区的上行信号质量，选择该用户设备相邻小区中下行信号质量满足第一门限要求的且满足以下任意一条件的小区作为该用户设备的服务小区：a）该下行信号质量满足第一门限要求的小区与上行信号质量满足第二门限要求的小区属于同一个基站；b）该下行信号质量满足第一门限要求的小区的上行信号质量满足第三门限要求。本发明比现有技术更好的提高服务小区改变后的HSDPA业务的吞吐量。

Description

一种高速下行分组接入系统服务小区选择方法及装置
技术领域
本发明涉及宽带码分多址（WCDMA )移动通信技术， 具体涉及在釆用 高速下行分组接入 ( HSDPA, High Speed Downlink Packet Access )技术的 WCDMA系统中服务小区的选择方法及装置。 背景技术
在釆用 HSDPA技术的 WCDMA系统中， 用户设备或称移动终端 （UE, User Equipment )会在无线网络控制器（ RNC, Radio Network Controller ) 的 控制下向 RNC报告 UE检测到的小区的下行导频信号强度或者质量。基于这 些小区的下行导频信号强度或者质量， RNC可以判决是否改变 UE当前的服 务小区。 一般来说， RNC会将下行导频信号强度或者质量最好的小区作为 UE 的服务小区， 并通过服务小区的高速物理共享信道（HS-PDSCH, High Speed Physical Shared Channel ) 向 UE发送数据。 同时， UE在上行和下行方 向还与服务小区以及激活集中的其他小区存在专用物理信道。 其中激活集中 的小区可能属于一个或者多个 NodeB。
对于以 HSDPA方式接收业务的 UE, UE会向激活集内的小区反馈下行 信道质量指示（ CQI, Channel Quality Indicator )以及下行数据包接收正确（ Ack ) 或者不正确（Nack )的指示。 控制服务小区的 NodeB会根据 CQI来判决下一 次给该 UE发送数据时釆用何种编码和调制方式； 如果 NodeB收到 Nack指 示， 即 UE没有正确接收已经发送的数据， 则 NodeB会根据网络侧配置的混 合自动重传请求 ( HARQ, Hybrid Automatic Repeat Request )的参数决定再次 向 UE发送没有正确接收的数据。
对于通用移动通讯系统 ( UMTS , Universal Mobile Telecommunications
System ) , UE接收到的下行导频信号强度或者质量最好的小区可能与接收到 UE的上行信号质量最好小区不同。 即对于 UE, 其在服务小区检测到的下行 导频信号强度或者质量， 在所有激活集小区中是最好的； 而对于激活集中的 小区而言， 服务小区接收到的 UE上行信号强度或者质量并不是所有激活集 小区中最好的。 为描述简单， 这里假设服务小区为小区 A, 上行信号强度或 者质量最好的小区为小区 B。
根据小区 A和小区 B是否属于同一个 NodeB, 可以分为下面两种场景： 场景一： 当小区 A与小区 B不是同一个小区， 但属于同一个 NodeB时， 为 UE提供下行 HSDPA服务的 NodeB从小区 B获得的上行 CQI和 Ack或者 Nack信息的误码率， 与小区 A与小区 B是同一个小区时获得的上行 CQI和 Ack或者 Nack信息的误码率是相同的，也是所有激活集小区获得的上行 CQI 和 Ack/Nack信息中误码率最低的。
场景二： 当小区 A和小区 B不属于同一个 NodeB时， 为 UE提供下行 HSDPA服务的 NodeB从小区 A获得的上行 CQI和 Ack或者 Nack信息的误 码率高于小区 B获得的上行 CQI和 Ack或者 Nack信息的误码率。
如果服务小区改变后， 出现场景二， 则有可能出现的后果是： 下行信道 强度和质量相比服务小区改变前更好， 但是控制服务小区的 NodeB检测到的 上行信道误码率比服务小区改变前更高， 造成下行出现更多的重传， 从而导 致服务小区的下行吞吐量比服务小区变更前更低。
发明内容
本发明所要解决的技术问题是提供一种高速下行分组接入系统服务小区 选择方法及装置， 避免出现变更后的服务小区的下行吞吐量比服务小区变更 前更低。
为解决上述技术问题， 本发明提供了一种高速下行分组接入系统服务小 区选择方法， 包括：
在为用户设备选择服务小区的过程中， 无线网络控制器（RNC )获取该 用户设备的相邻小区的下行信号质量， 以及属于激活集的该用户设备的相邻 小区的上行信号质量， 选择所述用户设备相邻小区中下行信号质量满足第一 门限要求的且满足以下任意一条件的小区作为该用户设备的服务小区： a )该下行信号质量满足第一门限要求的小区与上行信号质量满足第二门 限要求的小区属于同一个基站（NodeB ) ； b )该下行信号质量满足第一门限要求的小区的上行信号质量满足第三门 限要求。
优选地， 所述第一门限要求为选择该用户设备的相邻小区中下行信号质 量高于当前服务小区下行信号质量的且下行信号质量最好的小区。
优选地， 所述第二门限要求为选择属于激活集的该用户设备的相邻小区 中上行信号质量最好的小区， 或者设置该第二门限为保证基站正确解调该用 户设备发送的信道质量指示和反馈指示的误码率要求的上行信号质量。
优选地， 所述第三门限为保证基站正确解调该用户设备发送的信道质量 指示和反馈指示的误码率要求的上行信号质量。
优选地， 所述选择所述用户设备相邻小区中下行信号质量满足第一门限 要求的且满足以下任意一条件的小区作为该用户设备的服务小区时， 先进行 条件 a ) 的判断， 再进行条件 b ) 的判断。
优选地， 所述下行信号质量由公共导频信道（CPICH )的信号功率表示； 所述上行信道质量由上行接收总宽带功率（RTWP )表示。
为解决上述技术问题， 本发明还提供了一种高速下行分组接入系统服务 小区选择装置， 位于无线网络控制器（RNC ) ， 包括：
第一模块， 其设置为： 在为用户设备选择服务小区的过程中， 获取该用 户设备的相邻小区的下行信号质量， 以及属于激活集的该用户设备的相邻小 区的上行信号质量；
第二模块， 其设置为： 选择所述用户设备相邻小区中下行信号质量满足 第一门限要求的且满足以下任意一条件的小区作为该用户设备的服务小区： a )该下行信号质量满足第一门限要求的小区与上行信号质量满足第二门 限要求的小区属于同一个基站（NodeB ) ；
b )该下行信号质量满足第一门限要求的小区的上行信号质量满足第三门 限要求。
优选地， 所述第一门限要求为选择该用户设备的相邻小区中下行信号质 量高于当前服务小区下行信号质量的且下行信号质量最好的小区。 优选地， 所述第二门限要求为选择属于激活集的该用户设备的相邻小区 中上行信号质量最好的小区， 或者设置该第二门限为保证基站正确解调该用 户设备发送的信道质量指示和反馈指示的误码率要求的上行信号质量。
优选地， 所述第三门限为保证基站正确解调该用户设备发送的信道质量 指示和反馈指示的误码率要求的上行信号质量。
本发明实施例不仅选择下行信号质量优于当前服务小区的邻区作为新的 服务小区， 还判断相邻小区的上行负荷或者上行信号质量不会导致下行吞吐 量下降， 因此相比现有技术能够更好的提高服务小区改变后的 HSDPA业务 的吞吐量。 附图概述
图 1为本发明实施例流程图；
图 2为本发明实施例中服务小区与候选小区关系示意图。
本发明的较佳实施方式
下文中将结合附图对本发明的实施例进行详细说明。 需要说明的是， 在 不冲突的情况下， 本申请中的实施例及实施例中的特征可以相互任意组合。
本发明方案： 在为用户设备选择服务小区的过程中， 无线网络控制器 ( RNC )获取该用户设备的相邻小区的下行信号质量， 以及属于激活集的该 用户设备的相邻小区的上行信号质量， 选择所述用户设备相邻小区中下行信 号质量满足第一门限要求的且满足以下任意一条件的小区作为该用户设备的 服务小区：
1 )该下行信号质量满足第一门限要求的小区与上行信号质量满足第二门 限要求的小区属于同一个基站（NodeB ) ；
2 )该下行信号质量满足第一门限要求的小区的上行信号质量满足第三门 限要求。
由于在选择服务小区时增加了与上行信号质量相关的条件， 因此可以避 免出现变更后的服务小区的下行吞吐量比变更前服务小区更低的情况， 相比 现有技术能够更好的提高服务小区改变后的 HSDPA业务的吞吐量。
上述选择服务小区的方法可以应用于初次为用户设备选择服务小区， 也 可用于为用户设备更换当前服务小区。
在初次选择服务小区时， 该第一门限要求可以是选择该用户设备的相邻 小区中下行信号质量最好的小区。 在更换当前服务小区时， 该第一门限要求 可以是选择该用户设备的相邻小区中下行信号质量高于当前服务小区下行信 号质量的且下行信号质量最好的小区。 上述门限要求中选择下行信号质量最 好的小区为一种优选方式， 除此之外还可以釆用其他方式， 例如选择下行信 号质量次好的小区等。
对于上述条件 1 ) 满足第一门限要求的小区与上行信号质量满足第二门 限要求的小区可能不是同一小区。 第二门限要求可以是选择属于激活集的该 用户设备的相邻小区中上行信号质量最好的小区， 或者设置该第二门限为保 证基站正确解调该用户设备发送的信道质量指示和反馈指示的误码率要求的 上行信号质量， 该反馈指示包括： 数据包接收正确指示， 或者数据包接收不 正确指示。
对于上述条件 2 ) 满足第一门限要求的小区与上行信号质量满足第三门 限要求的小区为同一小区， 也就是说作为服务小区的小区除了满足第一门限 要求外， 还应满足第三门限要求。 第三门限要求与第二门限要求可以相同也 可以不同， 但设置的原则仍是保证基站正确解调该用户设备发送的信道质量 指示和反馈指示的误码率要求。
优选先进行条件 1 )的判断， 当条件 1 )不满足时再进行条件 2 )的判断。 上述下行信号质量可由公共导频信道（ CPICH, Common Pilot Channel ) 的信号功率（又称为 CPICH的接收功率）表示； 上述上行信道质量可由上行 接收总宽带功率（RTWP, Received Total Received Wideband Power )表示。
实现上述方法的服务小区选择装置， 位于 RNC, 包括：
第一模块， 用于在为用户设备选择服务小区的过程中， 获取该用户设备 的相邻小区的下行信号质量， 以及属于激活集的该用户设备的相邻小区的上 行信号质量；
第二模块， 用于选择所述用户设备相邻小区中下行信号质量满足第一门 限要求的且满足以下任意一条件的小区作为该用户设备的服务小区：
1 )该下行信号质量满足第一门限要求的小区与上行信号质量满足第二门 限要求的小区属于同一个 NodeB；
2 )该下行信号质量满足第一门限要求的小区的上行信号质量满足第三门 限要求。
下面通过一实例来对本发明进行说明， 以下实例主要为更换当前服务小 区的场景， 初次选择服务小区时可参照此流程执行。 如图 1所示， 包括以下 步骤：
步骤 10, 移动终端检测相邻小区的下行信号质量， 并将检测结果上报给 无线网络控制器（RNC ) ；
上述相邻小区的下行信号质量优选为相邻小区的公共导频信道（ CPICH,
Common Pilot Channel ) 的信号功率大小 （又称为 CPICH的接收功率） 。
上述相邻小区包括激活集小区和非激活集小区。
步骤 20, RNC从节点 B ( NodeB )获取步骤 10中所述的移动终端向 RNC 上报了下行信号质量的相邻小区的上行信道质量；
上述相邻小区的上行信道质量优选为该相邻小区上行接收总宽带功率
( RTWP, Received Total Received Wideband Power ) 。
在其他实施例中， RNC可只获取属于激活集中的且移动终端向 RNC上 报了下行信号质量的相邻小区的上行信道质量。
本步骤不限于在此时执行， 只要在步骤 50前执行即可。
步骤 30, RNC根据步骤 10中上报的测量结果， 比较各相邻小区的下行 信号质量， 将下行信号质量好于当前 HS-PDSCH服务小区下行信号质量的邻 区放入候选服务小区集合， 执行步骤 40; 当相邻小区的公共导频信号质量高于移动用户当前的服务小区时， 表明 在当前移动用户所处的位置， 该相邻小区的信号质量好于当前服务小区的信 号质量。
本步骤中构建候选服务小区集合是为了使得后续的判决描述更加简练 , 在其他实施例中， 也可以不构建该候选服务小区集合。
步骤 40, RNC 判断候选服务小区集合是否为空： 如果为空则执行步骤 10, 否则执行步骤 50;
步骤 50, RNC判断候选服务小区集合中下行信号质量最好的邻区与当前 激活集中的上行信道质量最好（即上行负荷最低） 的小区是否属于同一个 NodeB, 如果属于同一个 NodeB, 则执行步骤 90, 否则， 则执行步骤 60; 小区的上行 RTWP越高表明小区的上行负荷越重，反之 RTWP越低表明 小区的上行负荷越轻。
步骤 60, RNC判断候选服务小区集合中下行信号质量最好的邻区的上行 信道质量是否满足基站正确解调移动用户发送的信道质量指示以及反馈指示 的误码率要求： 如果满足， 则执行步骤 90, 否则， 执行步骤 70;
步骤 70, 将当前候选服务小区集合中下行信号质量最好的邻区从候选服 务小区集合中删除， 执行步骤 80;
步骤 80, 判断当前候选服务小区集合是否为空， 如果为空， 则执行步骤 100, 否则执行步骤 50;
步骤 90, 选择候选服务小区集合中下行信号质量最好的小区作为该移动 终端的新的服务小区；
步骤 100, 选择一个下行信号质量好于当前 HS-PDSCH服务小区的邻区 作为新的服务小区。
例如， 选择下行信号质量比当前 HS-PDSCH服务小区下行信号质量好的 邻区中下行信号质量最好的邻区作为新的服务小区， 或者任意选择一个下行 信号质量比当前 HS-PDSCH服务小区下行信号质量好的邻区作为新的服务小 区。 下面结合图 2说明上述实施例：
小区 （Cell ) 1为用户设备（User Equipment, UE ) 当前服务小区； Celll 和 Cell2均由基站（ NodeB ) 1控制， UE只与 Celll存在链接， 即激活集中只 有 Celll。
Cell3和 Cell4均为 Celll和 Cell2的邻区，分别由基站 NodeB2和 NodeB3 控制。
基站 NodeBl , NodeB2和 NodeB3均由同一个 RNC控制。
当 UE检测到 Cell2, Cell3和 Cell4的下行信号时， 根据上述实施例有如 下操作：
应用示例 1
第一步， UE监测到 Cell2, Cell3和 Cell4的信号， 测量各小区的公共导 频信号质量后上报给 RNC;
第二步， RNC从基站 NodeBl , NodeB2和 NodeB3处获取到 Celll , Cell2 和 Cell3的 RTWP;
第三步， RNC根据 Cell2, Cell3和 Cell4的公共导频信号质量报告结果， 发现 Cell2和 Cell3的公共导频信号质量好于 Celll , 因此将 Cell2和 Cell3放 入候选服务小区集合；
第四步， RNC根据 Cell2和 Cell3的 CPICH公共导频信号质量报告结果， 发现 Cell2的公共导频信号质量高于 Cell3 , 且判断后发现 Cell2与 Celll均由 NodeBl控制， 且 Cell2为激活集中 RTWP最低的小区， 即激活集中上行信道 质量最好的小区， 因此选择 Cell2为该 UE新的服务小区。
应用示例 2
第一步， UE监测到 Cell2, Cell3和 Cell4的信号， 测量各小区的公共导 频信号质量后上报给 RNC;
第二步， RNC从基站 NodeBl , NodeB2和 NodeB3处获取到 Celll , Cell2 和 Cell3的 RTWP; 第三步， RNC根据 Cell2, Cell3和 Cell4的公共导频信号质量报告结果， 发现 Cell2和 Cell3的公共导频信号质量好于 Celll , 因此将 Cell2和 Cell3放 入候选服务小区集合；
第四步： RNC根据 Cell2和 Cell3的公共导频信号质量报告结果， 发现 Cell3的公共导频信号质量高于 Cell2,判断发现 Cell3与 Celll由不同的 NodeB 控制， 但通过测量报告发现 Cell3的 RTWP满足基站正确解调移动用户发送 的信道质量指示以及反馈指示的误码率要求， 因此选择 Cell3作为该 UE新的 服务小区。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成， 所述程序可以存储于计算机可读存储介质中， 如只读 存储器、 磁盘或光盘等。 可选地， 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地， 上述实施例中的各模块 /单元可以釆用 硬件的形式实现， 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。
当然， 本发明还可有其他多种实施例， 在不背离本发明精神及其实质的 但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。
工业实用性 本发明实施例不仅选择下行信号质量优于当前服务小区的邻区作为新的 服务小区， 还判断相邻小区的上行负荷或者上行信号质量不会导致下行吞吐 量下降， 因此相比现有技术能够更好的提高服务小区改变后的 HSDPA业务 的吞吐量。

Claims

权 利 要 求 书
1、 一种高速下行分组接入系统服务小区选择方法， 包括：
在为用户设备选择服务小区的过程中， 无线网络控制器（RNC )获取该 用户设备的相邻小区的下行信号质量， 以及属于激活集的该用户设备的相邻 小区的上行信号质量， 选择所述用户设备相邻小区中下行信号质量满足第一 门限要求的且满足以下任意一条件的小区作为该用户设备的服务小区： a )该下行信号质量满足第一门限要求的小区与上行信号质量满足第二门 限要求的小区属于同一个基站（NodeB ) ； b )该下行信号质量满足第一门限要求的小区的上行信号质量满足第三门 限要求。
2、 如权利要求 1所述的方法， 其中，
所述第一门限要求为选择该用户设备的相邻小区中下行信号质量高于当 前服务小区下行信号质量的且下行信号质量最好的小区。
3、 如权利要求 1或 2所述的方法， 其中，
所述第二门限要求为选择属于激活集的该用户设备的相邻小区中上行信 号质量最好的小区， 或者设置该第二门限为保证基站正确解调该用户设备发 送的信道质量指示和反馈指示的误码率要求的上行信号质量。
4、 如权利要求 1或 2所述的方法， 其中，
所述第三门限为保证基站正确解调该用户设备发送的信道质量指示和反 馈指示的误码率要求的上行信号质量。
5、 如权利要求 1所述的方法， 其中，
所述选择所述用户设备相邻小区中下行信号质量满足第一门限要求的且 满足以下任意一条件的小区作为该用户设备的服务小区时，先进行条件 a )的 判断， 再进行条件 b ) 的判断。
6、 如权利要求 1所述的方法， 其中，
所述下行信号质量由公共导频信道（CPICH ) 的信号功率表示； 所述上 行信道质量由上行接收总宽带功率（RTWP )表示。
7、一种高速下行分组接入系统服务小区选择装置， 位于无线网络控制器 ( RNC ) , 包括：
第一模块， 其设置为： 在为用户设备选择服务小区的过程中， 获取该用 户设备的相邻小区的下行信号质量， 以及属于激活集的该用户设备的相邻小 区的上行信号质量；
第二模块， 其设置为： 选择所述用户设备相邻小区中下行信号质量满足 第一门限要求的且满足以下任意一条件的小区作为该用户设备的服务小区： a )该下行信号质量满足第一门限要求的小区与上行信号质量满足第二门 限要求的小区属于同一个基站（NodeB ) ；
b )该下行信号质量满足第一门限要求的小区的上行信号质量满足第三门 限要求。
8、 如权利要求 7所述的装置， 其中，
所述第一门限要求为选择该用户设备的相邻小区中下行信号质量高于当 前服务小区下行信号质量的且下行信号质量最好的小区。
9、 如权利要求 7或 8所述的装置， 其中，
所述第二门限要求为选择属于激活集的该用户设备的相邻小区中上行信 号质量最好的小区， 或者设置该第二门限为保证基站正确解调该用户设备发 送的信道质量指示和反馈指示的误码率要求的上行信号质量。
10、 如权利要求 7或 8所述的装置， 其中，
所述第三门限为保证基站正确解调该用户设备发送的信道质量指示和反 馈指示的误码率要求的上行信号质量。
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