WO2003088519A1 - Procede de commande de puissance destine a un canal de commande de liaison montante dans un transfert souple, dans un systeme d'acces par paquets en liaison descendante a haut debit - Google Patents

Procede de commande de puissance destine a un canal de commande de liaison montante dans un transfert souple, dans un systeme d'acces par paquets en liaison descendante a haut debit Download PDF

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Publication number
WO2003088519A1
WO2003088519A1 PCT/CN2003/000078 CN0300078W WO03088519A1 WO 2003088519 A1 WO2003088519 A1 WO 2003088519A1 CN 0300078 W CN0300078 W CN 0300078W WO 03088519 A1 WO03088519 A1 WO 03088519A1
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Prior art keywords
power
tpc
dpcch
offset
soft handover
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PCT/CN2003/000078
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English (en)
French (fr)
Inventor
Di Wu
Yuejun Wei
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to AU2003207228A priority Critical patent/AU2003207228A1/en
Priority to EP03702305A priority patent/EP1494366B1/en
Priority to DE60312501T priority patent/DE60312501D1/de
Publication of WO2003088519A1 publication Critical patent/WO2003088519A1/zh
Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/325—Power control of control or pilot channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non-transmission
    • H04W52/286—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non-transmission during data packet transmission, e.g. high speed packet access [HSPA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/38—TPC being performed in particular situations
    • H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff

Definitions

  • the patent relates to a power control method for a wireless communication system, and particularly to a power control method for an uplink control channel in a soft handover area of a high-speed data packet access system (HSDPA, Wideband Code Division Multiple Access).
  • HSDPA high-speed data packet access system
  • the high-speed uplink control channel (HS-DPCCH) of the HSDPA system contains two pieces of information, one is the hybrid automatic retransmission request response information ACK / NACK that the mobile station feeds back to the base station, indicating whether the mobile station correctly received the corresponding data from the base station Packets, ACK / NACK are sent in one time slot.
  • the other part is the downlink channel quality indication information CQI, which is transmitted at a certain period in two time slots. Since the CQI is reported periodically, the system does not make a requirement for the CQI error code.
  • the ACK / MCK error will directly cause the base station to make an incorrect judgment on whether the mobile station has correctly received the corresponding data packet, which will have a large impact on the performance of the hybrid automatic retransmission mechanism and the HSDPA system. Therefore, the ACK / NACK information will be incorrect.
  • the code has strict requirements.
  • the transmission power of ACK / NACK is based on the R99 version (R99) uplink control channel (DPCCH) of the third generation mobile communication system, and an additional power offset is added, and the size of the power offset is used as a system parameter.
  • the network side sends the message to the mobile station.
  • the R99 uplink DPCCH has multiple base stations receiving at the same time and has macro diversity gain, and ACK / NACK has only one base station, that is, the HSDPA serving base station receives, there is no macro diversity gain. If you want to ensure ACK / NACK Can be received correctly, The minimum power offset of ACK / NACK relative to the R99 uplink DPCCH should be greater than the power offset of the mobile station during non-soft handover, and the size of this power offset should be changed.
  • the power offset in order to ensure that the ACK / NACK of the mobile station in all positions of the cell can be received correctly, the power offset must be set according to the maximum situation, which will inevitably cause waste of ACK / NACK transmission power in some cases. It also adds unnecessary interference to other code channels.
  • R99 uplink pilot power, and the actual power of ACK / NACK is calculated by the counting method.
  • a common drawback of the above solutions is that the R99 downlink power control command position needs to be occupied, so that the R99 power control frequency is reduced.
  • additional pilot symbols need to be added, occupying a position for transmitting CQI bits.
  • the object of the present invention is to provide a high-speed data packet access system in soft handover.
  • Line control channel power control method This method enables the uplink control channel transmit power to be controlled in real time when the mobile station is in a soft handover area.
  • the average transmit power and the HSDPA uplink control are controlled. Channel interference to other code channels is reduced to a minimum.
  • the uplink control channel power control method in soft handover of the high-speed data packet access system includes:
  • step (3) Determine whether the merged TPC is the same as the TPC received from the serving base station (HS-N0DEB). If they are the same, go to step (4), otherwise go to step (5);
  • step (2) Determine whether the current power offset is less than the maximum allowable power offset, and if so, increase the power offset by an amount, and then go to step (2), otherwise go directly to step (2); because the present invention is R99 uplink DPCCH power
  • the transmit power offset between the HS-DPCCH and the R99 uplink DPCCH is increased to dynamically compensate the HS-DPDCH transmit power during soft handover, which is in line with existing methods.
  • the method described in the present invention is simple, and does not require any modification to the uplink and downlink control channels, and all operations are performed at the UE.
  • the transmit power offset between the HS-DPCCH and R99 uplink DPCCH of the present invention is less than or equal to Compared with the existing methods of adding a fixed power offset, the set maximum allowable power offset value can save transmission power.
  • the present invention enables the HS-DPCCH power to be not lower than the target value, thereby ensuring the information. Receiving correctly so that the bit error rate is lower than the system requirements. By adjusting the incremental size of the power offset and the number of times that the combined TPC is the same as the TPC received from HS-N0DEB, a fixed bit error rate can be achieved on the HS-DPCCH.
  • the average transmission power is the smallest; therefore, the present invention enables the transmission power of the uplink control channel to be controlled in real time when the mobile station is in a soft handover area.
  • the HSDPA uplink is effectively reduced. Control channel average transmit power and its interference to other code channels.
  • FIG. 1 is a flowchart of an embodiment of a method according to the present invention.
  • the HSDPA high-speed uplink control channel HS-DPCCH communicates with only one base station at any time, including when the UE is in a soft handover area, during soft handover, if the power of the HS-DPCCH follows the R99 uplink DPCCH, the communication quality obviously cannot be guaranteed.
  • a fixed offset is added to the transmit power. Because this value must ensure that the HS-DPCCH power is higher than the target value during all periods of soft handover, it will cause waste of transmit power.
  • the essence of the present invention is that the UE detects the R99 uplink DPCCH channel power level, and determines whether the R99 uplink DPCCH channel power level is not lower than the power target value in the HSDPA serving base station according to the detection result, and further determines the uplink HS-DPCCH. Transmit power The dynamic adjustment is performed to keep the HS-DPCCH receiving signal-to-noise ratio near the target value, thereby achieving the purpose of saving the transmission power under the premise of ensuring that the HS-DPCCH is correctly received.
  • FIG. 1 is a flowchart of an embodiment of a method according to the present invention.
  • step 1 when the UE has just entered soft handover, set the power offset Poff set of the HS-DPCCH and R99 uplink DPCCH to the system default value Poff set -df, that is, set the acknowledgement information ACK, non-acknowledgement
  • Poff set -df the system default value
  • the default power offset of the response information NACK and the downlink channel quality indication information CQI, the above default power offset values are different from each other; in this step, a maximum allowable power offset is also set to limit the adjustment range of the power offset, and Set a counter and the maximum count value N to assist in controlling the adjustment of the power offset, and clear the counter at the same time.
  • the UE Since the power adjustment is performed in the soft handover area, the UE may exit the soft handover area at any time. Therefore, after the UE enters the soft handover area from a non-soft handover area, it is necessary to determine whether the UE is in the soft handover area in step 2. , Indicating that the UE has exited the soft handover area, and the power adjustment in the soft handover area should be ended at this time; if the UE is in the soft handover area, the power offset value Poff set value in the soft handover area should be greater than or equal to the system default. The default value is Poff set -df.
  • the UE receives the TPC of each base station and performs TPC integration, thereby determining that the transmit power of the HS-DPCCH is transmitted on the R99 uplink DPCCH. Increase in power.
  • the UE combines the power control commands (TPC) issued by each base station that communicates with the UE, and uses the '' or of down 'algorithm, that is, among multiple base stations communicating with the UE, as long as there is One requires the UE to reduce the uplink transmit power, and the UE decreases. Only when all base stations require the UE to increase the transmit power, the UE increases the uplink power. During the handover, not only can the UE have a good communication quality with at least one base station, but it can also reduce the UE transmit power to a minimum. Taking the case of soft handover of two base stations as an example, two base stations are set up as base station 1 and base station 2, respectively.
  • ⁇ indicates that the base station requires the UE to increase the transmission power.
  • the base station requests the UE to increase the transmission power to increase the signal-to-noise ratio of the signal; it can also indicate that the UE increases the transmission power; 4 indicates that the base station requires the UE to reduce the transmission power.
  • the signal-to-noise ratio of the signal between the UE and the NodeB is higher than the target value.
  • the base station requires the UE to reduce the transmission power, which may also indicate that the UE reduces the transmission power.
  • the TPC is different from the TPC sent by the base station 1.
  • the base station 1 requires the UE to increase the transmission power, and the base station 2 requires the UE to reduce the transmission power. According to the "or of do dragon" method, the UE performs a reduction of the transmission power.
  • base station 1 only the power control command of base station 1 is ⁇ , and the power control commands of other base stations are i. Only then does the power control command executed by the UE be inconsistent with the power control command sent by NodeBl, and the inconsistency is necessarily caused by the base station 1 requesting ⁇ ,
  • the power control performed by the UE is i.
  • the HS-DPDCH transmit power should be dynamically compensated during soft handover.
  • the transmission power between the HS-DPCCH transmit power and the R99 uplink DPCCH transmit power is increased. Power bias.
  • step 3 it is determined whether the combined TPC is the same as the TPC received from the serving base station (HS-NodeB). If they are different, it is determined in step 5 whether the current power offset is less than the maximum allowable power offset set in step 1. If it is not less, it means that the power offset of HS-DPCCH is already the largest and cannot be increased. Therefore, go to step 2 to continue the control of the next round of HS-DPCCH bias power.
  • T 1 boost port ⁇ P i ⁇ i does not change iii does not change
  • the above process is mainly to compensate the transmission power of HS-DPCCH when the R99 uplink DPCCH power between the UE and the serving base station is out of control, that is, the HS when the uplink transmission power is controlled by other base stations -DPCCH transmit power.
  • step 3 If it is determined in step 3 that the combined TPC is the same as the TPC received from the serving base station (HS-NodeB), in order to make the control more in line with the requirements of the actual environment, it is determined in step 7 that the combined TPC is the same as the TPC received from the serving base station Whether the number of times exceeds the maximum count value N, that is, determines whether the value of the counter exceeds N. If it exceeds, it indicates that the UE's uplink channel power is under the control of the serving base station. At this time, the actual R99 uplink DPCCH power between the UE and the serving base station is at the target.
  • step 8 restore the power offset between HS-DPCCH and R99 uplink DPCCH to the default value Pof f se t df, that is, the Poff set needs to be reset, and the counter is cleared, and then go to step 2
  • step 7 restore the power offset between HS-DPCCH and R99 uplink DPCCH to the default value Pof f se t df, that is, the Poff set needs to be reset, and the counter is cleared, and then go to step 2
  • step 7 determines the TPC after N consecutive merges is the same as the TPC received from the serving base station, then set the Poff set to the default value Poff set t_df 0 If it is determined in step 7 that the combined TPC does not exceed the maximum count value N the same number of times as the TPC received from the serving base station, increase the value of the counter by one, and then go to step 1 to continue to HS-DPCCH. Control of wheel bias power.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Communication Control (AREA)

Description

高速数据包接入系统软切换中上行控制信道功率控制
方法 技术领域
本专利涉及无线通信系统的功率控制方法，具体涉及宽带码分多 址（WCDMA )高速数据包接入系统（HSDPA, High Speed Downl ink Packet Access ) 上行控制信道在软切换区域的功率控制方法。
背景技术
HSDPA系统的高速上行控制信道（HS- DPCCH ) 包含两部分信息， 一部分是移动台反馈给基站的混合自动重传请求应答信息 ACK/NACK, 表明移动台是否正确接收到基站发来的相应的数据包， ACK/NACK 在 一个时隙发送。 另外一部分是下行信道质量指示信息 CQI， 在 2个时 隙内以一定的周期发送。 由于 CQI是周期上报的， 因此系统对 CQI的 误码没有提出要求。 而 ACK/MCK的错误将直接导致基站对移动台是 否正确接收到相应数据包做出错误的判断， 对混合自动重传机制及 HSDPA 系统的性能造成较大影响， 因此对 ACK/NACK信息的误码有严 格的要求。 根据 HSDPA现有技术， ACK/NACK的发射功率在第 3代移 动通信系统 R99版本（ R99 )上行控制信道（ DPCCH )基础上加一个额 外的功率偏置， 功率偏置的大小作为系统参数， 由网络侧下发给移动 台。 当移动台处于软切换区域时， 由于 R99上行 DPCCH有多个基站同 时接收， 有宏分集增益， 而 ACK/NACK只有一个基站， 即 HSDPA服务 基站接收， 没有宏分集增益， 如果要保证 ACK/NACK能被正确接收， ACK/NACK相对于 R99 上行 DPCCH的最小功率偏置应该比移动台在非 软切换时的功率偏置大，而且这个功率偏置的大小应当是变化的。 按 照现有方法， 为了保证移动台在小区的所有位置 ACK/NACK都能被正 确接收， 功率偏置必须按照最大的情况进行设置， 这势必造成在某些 情况下 ACK/NACK发射功率的浪费， 同时也增加了对其他码道不必要 的的干扰。 在第 3代伙伴工程（ 3GPP) 的 R1-02- 0421提案 "具有 / 非具有特殊导频位的上行高速专用物理控制信道信号发射的能量需 求，， ( "Energy requirements for UL HS-DPCCH signaling with and without special pilot bits", Lucent, 2002.02 ) 一文中， 提出在 高速专用物理控制信道（HS-DPCCH )传送 CQI的 2个时隙中插入导频 符号，使软切换期间 HS-DPCCH功控和 R99的功率控制独立。 HS-DPCCH 功控命令通过与 R99 功率控制命令（TPC)信息以时分方式在下行 DPCCH中发送。 3GPP的 R1-02-0215提案 "软切换过程中 ACK/NACK的 功率控制，， ( "Power control of ACK/NACK in soft handover", Huawei 2002.02 )—文中， 也提出了类似的方法， 不同的是该文所述的方案 中不需要加额外的导频符号， 基站侧通过测量 R99上行导频功率， 并 通过计数方法， 计算出 ACK/NACK实际功率。 上述方案的共同缺陷在 于， 需要占用 R99下行功控命令位置， 使 R99功控频率降低。 对于前 一种提案来说， 还需要增加额外的导频符号， 占用了传送 CQI比特的 位置。
发明内容
本发明的目的在于提供一种高速数据包接入系统软切换中的上 行控制信道功率控制方法，该方法能使移动台处于软切换区域时上行 控制信道发射功率得到实时控制， 在保证 ACK/NACK误码达到系统要 求的前提下，使平均发射功率以及使 HSDPA上行控制信道对其他码道 的干扰减小到最低程度。
为达到上述目的，本发明提供的高速数据包接入系统软切换中上 行控制信道功率控制方法， 包括：
(1) 用户设备（UE)进入软切换区域时， 设置高速上行物理控 制信道（ HS- DPCCH )与 R99版本（ R99 )上行控制信道（ DPCCH )的功 率偏置为系统缺省偏置， 同时设置最大允许功率偏置；
(2)判断 UE是否处于软切换区域， 如果是， 接收各基站的功率 控制命令（TPC) 并进行 TPC合并， 然后转步骤（3), 否则结束功率 控制操作；
(3)判断合并后的 TPC与从服务基站 ( HS-N0DEB )接收的 TPC 是否相同， 如果相同， 转步骤（4), 否则转步骤（5);
( 4 )判断合并后的 TPC与从 HS-N0DEB接收的 TPC的相同次数是 否超过指定的数值， 如果超过， 将 HS- DPCCH与 R99上行 DPCCH的功 率偏置设置为系统缺省偏置， 然后转步骤（2), 否则直接转步骤（2);
(5)判断当前功率偏置是否小于最大允许功率偏置， 如果是， 将功率偏置增加一个量， 然后转步骤（2), 否则直接转步骤（2); 由于本发明在 R99上行 DPCCH功率被其他除服务基站之外的基站 控制时， 增加 HS-DPCCH与 R99上行 DPCCH之间的发射功率偏置， 以 在软切换期间对 HS- DPDCH发射功率进行动态补偿， 与现有的方法相 比， 本发明所述方法简单， 不需要对上下行控制信道作任何修改， 所 有操作均在 UE端完成； 同时， 本发明的 HS-DPCCH与 R99上行 DPCCH 之间的发射功率偏置小于或等于设定的最大允许功率偏置值，与目前 已有的加固定功率偏置的方法相比， 能够节省发射功率； 另外， 本发 明使 HS-DPCCH功率不低于目标值， 从而可以保证信息的正确接收， 使误码率低于系统要求，通过调整功率偏置的增量大小以及合并后的 TPC与从 HS- N0DEB接收的 TPC相同的次数， 可以实现在 HS- DPCCH接 收误码率一定的前提下， 平均发射功率最小； 因此， 本发明能使移动 台处于软切换区域时上行控制信道发射功率得到实时控制， 在保证 ACK/NACK误码达到系统要求的前提下， 有效的降低了 HSDPA上行控 制信道平均发射功率及其对其他码道的干扰。
附图说明
图 1是本发明所述方法实施例流程图。
具体实施方式
由于 HSDPA高速上行控制信道 HS-DPCCH在任何时候， 包括 UE处 于软切换区域时， 只与一个基站通信， 在软切换期间， HS-DPCCH 功 率如果跟随 R99上行 DPCCH显然不能保证通信质量，如果在 DPDCH发 射功率基础上加一个固定偏置，由于这个值必须保证在软切换的所有 期间 HS-DPCCH功率均高于目标值， 又会造成发射功率的浪费。 基于 上述事实， 本发明的实质， 是 UE端通过检测 R99上行 DPCCH信道功 率水平，根据检测结果判断 R99上行 DPCCH信道功率水平是否不低于 HSDPA服务基站中的功率目标值， 进而对上行 HS- DPCCH发射功率进 行动态调整， 使得 HS- DPCCH接收信噪比保持在目标值附近， 从而在 保证 HS-DPCCH正确接收前提下， 达到节约发射功率的目的。
下面结合附图对本发明作进一步详细的描述。
图 1是本发明所述方法实施例流程图。 按照图 1 , 在步骤 1 , 当 UE刚进入软切换时， 设置 HS- DPCCH和 R99上行 DPCCH的功率偏置 Poff set为系统缺省值 Poff set -df , 也就是设置确认应答信息 ACK、 非确认应答信息 NACK和下行信道质量指示信息 CQI的缺省功率偏置， 上述缺省功率偏置值互不相同；在该步骤，还设置最大允许功率偏置， 以限定功率偏置的调整范围， 以及设置一个计数器和最大计数值 N， 以辅助控制功率偏置的调整， 同时将计数器清零。 由于功率调整是在 软切换区域内进行的， UE随时都可能退出软切换区域， 因此当 UE由 非软切换区域进入软切换区域后， 要在步骤 2判断 UE是否正处于软 切换区域， 如果不是， 说明 UE已经退出软切换区域， 此时应结束在 软切换区域的功率调整； 如果 UE正处在软切换区， 应保证在软切换 区域的功率偏置值 Poff set值要大于或等于系统缺省值 Poff set -df , 为在软切换期间对 UE的功率偏置进行控制， 在步骤 3 , UE接收各基 站的 TPC并进行 TPC合并， 由此确定 HS-DPCCH的发射功率在 R99上 行 DPCCH发射功率基础上的提高幅度。
步骤 3中 UE对和 UE进行通信的各基站下发的功控命令 ( TPC ) 进行合并， 和并采用' 'or of down"算法， 就是说， 在与 UE通信的多 个基站中， 只要有一个要求 UE降低上行发射功率， UE就降低， 只有 所有基站均要求 UE提高发射功率， UE才提高上行功率。 这样在软切 换期间， 既能保证 UE至少和一个基站之间有较好的通信质量， 又能 使 UE发射功率降低至最小。 以 2个基站的软切换情形为例， 支设两 个基站分别为基站 1和基站 2 , 采用" or of down"方法的示例参考下 表： 表中： ΐ表示基站要求 UE提高发射功率， 此时 UE和基站之间信 号的信噪比低于目标值， 基站要求 UE提高发射功率， 以提高信号的 信噪比； 也可以表示 UE提高发射功率； 4表示基站要求 UE降低发射 功率， 此时 UE和 NodeB之间信号的信噪比高于目标值， 基站要求 UE 降低发射功率， 也可以表示 UE降低发射功率。
Figure imgf000008_0001
由上表可以看出， 对于基站 1来说， 有一种情形， UE合并后的
TPC与基站 1发送的 TPC不同， 基站 1要求 UE提高发射功率， 而基 站 2要求 UE降低发射功率， 根据 "or of do龍" 方法， 此时 UE执行 的是降低发射功率。 推广至两个以上的基站的情形， 例如基站 1， 基 站 2， 基站 3. . . , 对基站 1来说， 只有基站 1的功控命令为 ΐ， 其他 基站的功控命令有 i的时候， 才会出现 UE执行的功控命令与 NodeBl 发出的功控命令不一致， 而且不一致的情况必然是基站 1要求为 ΐ , 而 UE执行的功控为 i。
当出现上述的不一致时， 意味着基站 1和 UE之间链路的信号发 射功率达不到目标值， 甚至在某些情况下， 当基站 1和 UE之间的信 号质量变差， 达不到目标要求时， 由于" or of down"方法的作用， UE 发射的功率不升反降， 导致发射功率和目标值之间的差距越来越远。 为此， 应在软切换期间对 HS-DPDCH发射功率进行动态补偿， 当 R99 上行 DPCCH功率被其他除服务基站之外的基站控制时，增加 HS- DPCCH 的发射功率与 R99上行 DPCCH发射功率之间的功率偏置。
因此， 在步骤 3中判断合并后的 TPC与从服务基站 ( HS-NodeB ) 接收的 TPC是否相同， 如果不同， 在步骤 5判断当前的功率偏置是否 小于步骤 1设定的最大允许功率偏置， 如果不小于， 说明 HS-DPCCH 的功率偏置已经最大， 不能继续增加， 因此转步骤 2 继续进行 HS-DPCCH下一轮偏置功率的控制， 如果小于， 说明 HS- DPCCH的功率 偏置可以继续增加， 因此要经步骤 6在 HS- DPCCH的发射功率和 R99 DPCCH的发射功率的偏置 Poff set的基础上增加一个量级 Δ Ρ ( Δ Ρ为 一系统参数， ACK、 NACK以及 CQ I部分增加的 Δ P可以相同， 也可以 不相同）； 否则原功率偏置 Poff set 不变， 参考下表； 然后转步骤 2 继续进行 HS-DPCCH 下一轮偏置功率的控制。 这样， 通过动态调节 HS-DPCCH 的发射功率与 R99 DPCCH 的发射功率的功率偏置， 使得 HS-DPCCH发射功率始终处于其目标值之上。 TPC (服务基站） TPC (其他基站) TPC (合并） Poff se t
T † ΐ 不变
T 1 增力口△ P i † i 不变 i i i 不变 上述过程主要是补偿 UE与服务基站之间的 R99上行 DPCCH功率 失控时 HS-DPCCH 的发射功率， 即上行发射功率被其他基站控制时 HS-DPCCH的发射功率。 如果在步骤 3中判断合并后的 TPC与从服务 基站（HS- NodeB )接收的 TPC相同，为使控制更符合实际环境的要求， 在步驟 7判断合并后的 TPC与从服务基站接收的 TPC相同的次数是否 超过最大计数值 N， 即判断计数器的值是否超过 N， 如果超过， 说明 UE上行信道功率处于服务基站的控制之下， 此时 UE与服务基站之间 的 R99上行 DPCCH实际功率处于目标值附近，则在步骤 8将 HS- DPCCH 与 R99上行 DPCCH之间的功率偏置恢复到缺省值 Pof f se t— df， 即需 要对 Poff set进行复位， 同时计数器清零， 然后转步骤 2继续进行 HS-DPCCH下一轮偏置功率的控制； 也就是说， 如果连续出现 N次合 并后的 TPC与从服务基站接收的 TPC相同，则将 Poff set置为缺省值 Poff se t _df 0 如果 在步骤 7判断合并后的 TPC与从服务基站接收的 TPC相同的次数没有超过最大计数值 N， 将计数器的值加 1， 然后转 步骤 1继续进行 HS-DPCCH下一轮偏置功率的控制。

Claims

权 利 要 求
1、 一种高速数据包接入系统软切换中上^ "控制信道功率控制方 法， 包括：
(1) 用户设备（UE)进入软切换区域时， 设置高速上行物理控 制信道（ HS-DPCCH )与 R99版本（ R99 )上行控制信道（ DPCCH )的功 率偏置为系统缺省偏置， 同时设置最大允许功率偏置；
(2)判断 UE是否处于软切换区域， 如果是， 接收各基站的功率 控制命令（TPC) 并进行 TPC合并， 然后转步骤 (3), 否则结束功率 控制操作；
(3)判断合并后的 TPC与从服务基站（ HS- N0DEB )接收的 TPC 是否相同， 如果相同， 转步骤（4)， 否则转步骤（5);
( 4 )判断合并后的 TPC与从 HS- N0DEB接收的 TPC的相同次数是 否超过指定的数值， 如果超过， 将 HS-DPCCH与 R99上行 DPCCH的功 率偏置设置为系统缺省偏置， 然后转步骤（2)， 否则直接转步骤（2);
(5) 判断当前功率偏置是否小于最大允许功率偏置， 如果是， 将功率偏置增加一个量， 然后转步骤（2), 否则直接转步骤（2);
2、根据权利要求 1所述的软切换中上行控制信道功率控制方法， 其特征在于： 所述步骤（ 4 )统计合并后的 TPC与从 HS- N0DEB接收的 TPC的相同次数使用计数器实现。
3、根据权利要求 2所述的软切换中上行控制信道功率控制方法， 其特征在于： 在步骤（ 4 )中将 HS-DPCCH与 R99上行 DPCCH的功率偏 置设置为系统缺省偏置之后， 转步骤（2) 以前， 还包括对计数器的 清零操作。
4、根据权利要求 1、 2或 3所述的软切换中上行控制信道功率控 制方法，其特征在于： 步骤（2)所述接收各基站的功率控制命令（TPC ) 并进行 TPC合并， 按照下述方法进行： 在所有基站的 TPC中， 如果有 一个基站的 TPC要求 UE降低上行发射功率， 则合并后的 TPC为要求 UE降低发射功率的 TPC, 如果有所有基站的 TPC都要求 UE提高上行 发射功率， 则合并后的 TPC为要求 UE提高发射功率的 TPC。
5、根据权利要求 4所述的软切换中上行控制信道功率控制方法， 其特征在于： 步骤（ 1 )所述设置 HS-DPCCH与 R99上行 DPCCH的功率 偏置为系统缺省偏置， 是设置确认应答信息 ACK 或非确认应答信息 NACK的缺省功率偏置， 以及设置下行信道质量指示信息 CQI 的缺省 功率偏置， 上述缺省功率偏置值互不相同。
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