WO2003009506A1 - Procede de transport d'un canal physique de groupement commun a polarisation de puissance - Google Patents

Procede de transport d'un canal physique de groupement commun a polarisation de puissance Download PDF

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Publication number
WO2003009506A1
WO2003009506A1 PCT/CN2002/000096 CN0200096W WO03009506A1 WO 2003009506 A1 WO2003009506 A1 WO 2003009506A1 CN 0200096 W CN0200096 W CN 0200096W WO 03009506 A1 WO03009506 A1 WO 03009506A1
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WIPO (PCT)
Prior art keywords
prefix
power
access
power control
offset
Prior art date
Application number
PCT/CN2002/000096
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English (en)
French (fr)
Inventor
Huajia Li
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to AT02703455T priority Critical patent/ATE553619T1/de
Priority to EP02703455A priority patent/EP1414174B1/en
Publication of WO2003009506A1 publication Critical patent/WO2003009506A1/zh
Priority to US10/736,279 priority patent/US7382761B2/en

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Classifications

    • 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
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment
    • 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
    • H04W52/30—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
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to a mobile communication system, and in particular to a method for transmitting a physical common packet channel channel with a power offset in a wideband code division multiple access communication system. Background technique
  • the physical public packet channel is an access prefix
  • the power transmitted by the access prefix is a climbing process: the initial access prefix is transmitted starting with the estimated value of the open loop power. If no downlink acknowledgement is received, the access prefix is continued to be transmitted with a power offset of 1P0. When receiving the downlink acknowledgment information, the collision detection prefix is sent at the same power. After receiving the confirmation message, the power control prefix and the message part are sent at the Pp-m power offset of the relative collision detection prefix.
  • Figure 1 A schematic diagram of the entire process is shown in Figure 1.
  • the acquisition probability of the access prefix that is successfully captured by the base station is not high.
  • the role of the conflict detection prefix is to perform conflict detection. At reasonable cost, the capture probability should be as high as possible. If the collision detection prefix is sent at the same power, it will result in no collision and the collision detection prefix may not be detected. In this way, the access process has to start again, which is very costly.
  • One method currently used is to increase the climbing step of the access prefix, which can increase the average power level and acquisition probability of the access prefix that was successfully accessed last.
  • the disadvantage is that the power level (or signal-to-noise ratio) of the access prefix that was successfully accessed last fluctuated greatly, which failed to achieve the purpose of climbing power control of the access prefix. And the capture performance improvement of collision detection prefixes is limited.
  • the power control prefix following the collision detection prefix is used for power control.
  • only a rough power control can be obtained by climbing the access prefix. This accuracy is generally insufficient for demodulation of the message part.
  • the power control prefix needs to be used for power control, so that when the power control prefix ends, the message part has a better power control result.
  • How the power control effect of the power control prefix power control is directly related to the power of the power control prefix. If the power of the power control prefix is larger, the SIR estimation of the base station is more accurate and the power control prefix power control is more accurate.
  • the power value of the demodulation in the subsequent message part is determined by the demodulation performance that can be achieved in the message part, and it is related to the spreading factor, coding, channel, etc. of the message part. Its value is generally not the same as the optimized power value of the power control prefix. In this way, there will be a certain power difference between the power control prefix and the control part of the message part. However, there is no such power difference in the current physical public packet channel. In this way, it is difficult to achieve the optimal overall performance of the entire link. Summary of the Invention
  • the object of the present invention is to propose a method for transmitting a physical public packet channel with power offset.
  • the access probability of the physical public packet channel during transmission can be improved by using power offset, and interference with other users can be reduced.
  • the physical public packet channel transmission method with power offset of the present invention is that during the access process of the physical public packet channel transmission of code division multiple access, After receiving the base station's acquisition indication of the downlink channel for the incoming prefix, the user equipment sends a collision detection prefix to the base station with a power offset Pa- C relative to the access prefix that was successfully accessed last.
  • the user equipment After the base station receives the capture response to the conflict detection prefix, the user equipment sends the first time slot of the power control prefix with another power offset Pa-p relative to the access prefix that was successfully accessed last.
  • the time slots following the time slots are adjusted for power according to closed-loop power control.
  • the user equipment After the user equipment finishes transmitting the last time slot of the power control prefix, it sends the control part and data part of the message part to the base station with another power offset ⁇ Pp-m of the last power control prefix time slot.
  • the power sent by the control part of the message part is two offsets from the power prefix of the last successfully accessed access prefix.
  • FIG. 1 is a schematic diagram of a physical public packet channel transmission process in a currently used CDMA communication system.
  • FIG. 2 is a schematic diagram of a transmission process of a physical common packet channel with power offset in a code division multiple access communication system used in the present invention. detailed description
  • the method idea of the present invention is mainly in a physical common channel, and the access prefix (AP) and conflict detection prefix (CD_P), access prefix (AP), and power control prefix ( (PCP), and a power offset is added between the power control prefix (PCP) and the control part of the message part (Message).
  • AP access prefix
  • CD_P conflict detection prefix
  • PCP power control prefix
  • a power offset is added between the power control prefix (PCP) and the control part of the message part (Message).
  • lPa-c the power offset of the collision detection prefix
  • Pa-p the power offset of the first slot of the power control prefix
  • the time slot after the time slot is adjusted according to the power control, and the power offset from the control part of the message part to the last power control prefix time slot is defined as Pp-m.
  • the method for transmitting a physical public packet channel with power offset is that during the access process of the physical public packet channel transmission of code division multiple access, when the access prefix sent by the user equipment gets the base station in the downlink After the acquisition of the channel is instructed, the user equipment sends a collision detection prefix to the base station with a power offset ⁇ Pa-c relative to the access prefix that was last successfully accessed.
  • the user equipment After the base station receives the capture response to the conflict detection prefix, the user equipment sends the first time slot of the power control prefix with another power offset Pa-p relative to the access prefix that was successfully accessed last.
  • the time slots following the time slots are adjusted for power according to closed-loop power control.
  • the user equipment After the user equipment finishes transmitting the last time slot of the power control prefix, it sends the control part and data part of the message part to the base station with another power offset lPp-m of the last power control prefix time slot.
  • the power sent by the control part of the message part is two offsets relative to the last successful access access power offset. The sum of Pa-p and l Pp-m.
  • the signal in the physical public packet channel transmission has the following advantages ⁇
  • the access probability of the physical public packet channel can be increased, and the average time of successful access can be reduced.
  • the final power offset Pa-c for successfully accessing the access prefix and the collision detection prefix it is possible to avoid a situation in which the collision detection prefix access probability is low and improve the access probability of the collision detection prefix.
  • the power control effect of the power control prefix can be improved, and the demodulation performance of the message part can be enhanced.
  • the power control function of the power control prefix and the demodulation function of the message part can be fully utilized to improve the power control effect of the power control prefix, thereby improving the entire link. Comprehensive performance.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
  • Electrotherapy Devices (AREA)

Description

带功率偏置的物理公共分组信道传输方法 技术领域
本发明涉及移动通信系统， 特别涉及宽带码分多址通信系统中带功率偏置的 物理公共分组信道信道传输方法。 背景技术
在宽带码分多址的物理公共分组信道里， 物理公共分组信道是由接入前缀
(AP) 、 冲突检测前缀 (CD_P)、 功率控制前缀 (PCP)、 消息部分 (Message)组成。 接入前缀发射的功率是一个爬坡的过程： 初始接入前缀以开环功率估计的值开始 发送， 如果没有收到下行的确认信息， 就 以 1P0的功率偏置继续发送接入前缀。 当收到下行的确认信息时， 就以相同的功率发送冲突检测前缀， 收到确认消息后， 就以相对冲突检测前缀的 Pp-m功率偏置发送功率控制前缀和消息部分。 整个过 程的示意图如图 1。
由于接入前缀的的主要作用是用来确定一个大致合适的发射功率值， 在最后 成功被基站捕获的接入前缀的功率电平下， 其捕获概率是并不高。 而冲突检测前 缀的作用是用来进行冲突检测的。 在代价合理的情况下， 捕获概率应该尽可能地 高。 如果以相同的功率发送冲突检测前缀， 就会导致既是没有冲突， 冲突检测前 缀也可能检测不到。 这样， 这个接入进程就得从新开始， 代价很大。 目前釆用的 一种方法是提高接入前缀的爬升步长， 这样可以提高最后成功接入的接入前缀的 平均功率电平和捕获概率。 其缺点就是最后成功接入的接入前缀的功率电平 （或 信噪比）波动较大， 达不到接入前缀爬坡功控的目的。 并且对冲突检测前缀的捕 获性能改善有限。
冲突检测前缀后面的功率控制前缀是用来进行功率控制的， 从前面的描述可 见， 通过接入前缀的爬坡只能得到一个大致的功率控制， 这个精度对于消息部分 解调一般是不够的。 这样， 就需要由功率控制前缀来进行功率控制， 以达到功率 控制前缀结束时， 消息部分有较好的功率控制结果。 功率控制前缀功率控制的功 率控制效果如何与功率控制前缀的功率大小有直接相关。 如果功率控制前缀功率 较大， 则基站的 SIR估计就越准确， 功率控制前缀功率控制就越准确。 反之， 功率 控制前缀的功率越小， 则基站的 SIR估计就越不准确， 功率控制前缀功率控制就效 果越差。 但也不能无限制地增加功率控制前缀功率， 因为功率的增加会带来开销 和对其他用户的干扰。 因此， 对功率控制前缀的功率与最后成功接入的接入前缀 之间是有一个最优功率偏置值。
后面的消息部分解调的功率值是由消息部分所能达到的解调性能决定， 与消 息部分的扩频因子、 编码、 信道等有关系。 它的值一般与功率控制前缀的优化功 率值并不相同。 这样， 功率控制前缀与消息部分的控制部分之间就会有一定的功 率差。 而目前的物理公共分组信道里没有此功率差， 这样， 就难以达到整个链路 的综合性能最优。 发明内容
针对目前宽带码分多址的物理公共分组信道的传输过程中， 存在的接入概率 成功概率较低， 对其他用户干扰大， 链路综合性能较差的缺点。 本发明的目的是 提出一种带功率偏置的物理公共分组信道传输方法， 利用该方法可通过功率偏置 来改善物理公共分组信道的传输过程中的接入成功概率， 减少对其他用户的干扰， 提高整个链路的综合性能。
为了实现上述目的， 本发明采用如下技术方案： 本发明的带功率偏置的物 理公共分组信道传输方法是在码分多址的物理公共分组信道传输的接入过程中， 当用户设备发送的接入前缀得到基站在下行信道的捕获指示后， 用户设备以相对 最后成功接入的接入前缀以功率偏置量 Pa-C发送冲突检测前缀给基站。
当基站接收到对冲突检测前缀的捕获应答后， 用户设备就以相对最后成功 接入的接入前缀以另一功率偏置量 Pa-p发送功率控制前缀的第一个时隙， 第一 个时隙后面的时隙根据闭环功率控制进行功率调整。 用户设备结束最后一个功率控制前缀的时隙发送后， 就以最后一个功率控制 前缀时隙的又一功率偏置量 ^Pp-m进行发送消息部分的控制部分及数据部分给基 站。
当用户设备在不发送功率控制前缀或功率控制前缀的时隙个数为 0时， 消息 部分的控制部分发送的功率为相对最后成功接入的接入前缀功率偏置量为两个偏 置量 l Pa- p与 l Pp-m之和。 附图说明
图 1为目前采用的码分多址通信系统中的物理公共分组信道传输过程示意 图。
图 2本发明所采用的码分多址通信系统中带功率偏置的物理公共分组信道 传输过程示意图。 具体实施方式
请参阅图 2所示， 本发明的方法思想主要是在物理公共信道中， 最后成功接 入的接入前缀（AP )与冲突检测前缀 (CD_P)、接入前缀（AP)与功率控制前缀 (PCP)、 与功率控制前缀 (PCP)与消息部分 (Message)的控制部分之间加入功率偏置量。 以 最后成功接入的接入前缀的功率为基准， 定义冲突检测前缀的功率偏置量为 lPa- c, 定义功率控制前缀第一个时隙的功率偏置量为 Pa-p， 第一个时隙后面时隙根 据功率控制调整， 定义消息部分的控制部分到最后一个功率控制前缀时隙的功率 偏置量为 Pp- m。
根据上述思想和定义， 本发明的带功率偏置的物理公共分组信道传输方法 是在码分多址的物理公共分组信道传输的接入过程中， 当用户设备发送的接入前 缀得到基站在下行信道的捕获指示后， 用户设备以相对最后成功接入的接入前缀 以功率偏置量 ^ Pa-c发送冲突检测前缀给基站。
当基站接收到对冲突检测前缀的捕获应答后， 用户设备就以相对最后成功 接入的接入前缀以另一功率偏置量 Pa-p发送功率控制前缀的第一个时隙， 第一 个时隙后面的时隙根据闭环功率控制进行功率调整。
用户设备结束最后一个功率控制前缀的时隙发送后， 就以最后一个功率控 制前缀时隙的又一功率偏置量 lPp-m进行发送消息部分的控制部分及数据部分给 基站。 当用户设备在不发送功率控制前缀或功率控制前缀的时隙个数为 0时， 消息 部分的控制部分发送的功率为相对最后成功接入的接入前缀功率偏置量为两个偏 置量 l Pa- p与 l Pp-m之和。 工业应用性
由于本发明采用上述的带功率偏置的物理公共分组信道传输方法后， 信号 物理公共分组信道中传输中具有下面的优点-
1 )可以增加物理公共分组信道的接入成功概率， 縮小成功接入的平均时间。 有了最后成功接入接入前缀与冲突检测前缀的功率偏置量 Pa-c后， 可以避免冲 突检测前缀接入概率较低的状况， 提高冲突检测前缀的接入概率。
2 )可以减少对其他用户的干扰， 可以使接入前缀的爬坡阶梯 的取值更 小， 使用户成功接入时最后一个接入前缀的功率更加平稳， 即达到更好的功率控 制效果， 对其他用户设备的干扰也就更小。
3 )可以提高功率控制前缀的功率控制效果， 增强消息部分的解调性能。 通 过功率控制前缀与消息部分的控制部分有不同的功率偏置， 可以充分发挥功率控 制前缀的功率控制功能和增强消息部分的解调功能， 提高功率控制前缀的功率控 制效果， 从而提高整个链路的综合性能。

Claims

权利要求书
1、 一种带功率偏置的物理公共分组信道传输方法， 基本特征在于： 在码分 多址的物理公共分组信道传输的接入过程中， 当用户设备发送的接入前缀得到基 站在下行信道的捕获指示后， 用户设备以相对最后成功接入的接入前缀以功率偏 置量 Pa- c发送冲突检测前缀给基站。
2、 如权利要求 1所述的带功率偏置的物理公共分组信道传输方法， 其特征 在于： 当基站接收到对冲突检测前缀的捕获应答后， 用户设备就以相对最后成功 接入的接入前缀以另一功率偏置量 Pa- p发送功率控制前缀的第一个时隙， 第一 个时隙后面的时隙根据闭环功率控制进行功率调整。
3、 如权利要求 2所述的带功率偏置的物理公共分组信道传输方法， 其特征 在于： 用户设备结束最后一个功率控制前缀的时隙发送后， 就以最后一个功率控 制前缀时隙的又一功率偏置量 Pp-m进行发送消息部分的控制部分及数据部分给 基站。
4、 如权利要求 3所述的带功率偏置的物理公共分组信道传输方法， 其特征 在于： 当用户设备在不发送功率控制前缀或功率控制前缀的时隙个数为 0时， 消息 部分的控制部分发送的功率为相对最后成功接入的接入前缀功率偏置量为两个偏 置量 Pa- p与 Pp- m之和。
PCT/CN2002/000096 2001-07-20 2002-02-20 Procede de transport d'un canal physique de groupement commun a polarisation de puissance WO2003009506A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT02703455T ATE553619T1 (de) 2001-07-20 2002-02-20 Transportverfahren für einen physikalischen kommunalen gruppierungskanal mit leistungs-bias
EP02703455A EP1414174B1 (en) 2001-07-20 2002-02-20 A transport method for a physical communal grouping channel with power bias
US10/736,279 US7382761B2 (en) 2001-07-20 2003-12-15 Transmission method for physical common packet channels having a power bias

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNB011263032A CN1161908C (zh) 2001-07-20 2001-07-20 带功率偏置的物理公共分组信道传输方法
CN01126303.2 2001-07-20

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CN108024323B (zh) * 2016-11-03 2020-09-08 华为技术有限公司 功率分配方法、功率调整方法、终端和接入网设备

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US6219343B1 (en) * 1997-07-29 2001-04-17 Nokia Mobile Phones Ltd. Rate control techniques for efficient high speed data services

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AU766021B2 (en) * 1999-07-07 2003-10-09 Samsung Electronics Co., Ltd. Channel assignment apparatus and method for common packet channel in a WCDMA mobile communication system

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US6181683B1 (en) * 1995-06-14 2001-01-30 International Business Machines Corp. Packet data transmission in code-division multiple access communication systems
US6219343B1 (en) * 1997-07-29 2001-04-17 Nokia Mobile Phones Ltd. Rate control techniques for efficient high speed data services

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CN1399427A (zh) 2003-02-26
US7382761B2 (en) 2008-06-03
EP1414174A4 (en) 2010-07-28
EP1414174B1 (en) 2012-04-11
ATE553619T1 (de) 2012-04-15
CN1161908C (zh) 2004-08-11
EP1414174A1 (en) 2004-04-28
US20040127227A1 (en) 2004-07-01

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