CN1522075A - Power control method of end-to-end direct communication of NB TDD CDMA mobile communication system - Google Patents

Power control method of end-to-end direct communication of NB TDD CDMA mobile communication system Download PDF

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CN1522075A
CN1522075A CNA031038093A CN03103809A CN1522075A CN 1522075 A CN1522075 A CN 1522075A CN A031038093 A CNA031038093 A CN A031038093A CN 03103809 A CN03103809 A CN 03103809A CN 1522075 A CN1522075 A CN 1522075A
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power control
terminal
direct communication
end
power
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CNA031038093A
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张淑伟
李小强
阎桂霞
杜高科
金正坤
李周镐
崔成豪
李玄又
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北京三星通信技术研究有限公司
三星电子株式会社
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Priority to CNA031038093A priority Critical patent/CN1522075A/en
Publication of CN1522075A publication Critical patent/CN1522075A/en

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Abstract

An end-to-end direct communication power control method for NB TDD CDMA mobile communication system comprising the steps of, the power control mode in the end-to-end direct communication being achieved by the two terminals of the direct communication, the uplink and downlink closed-loop proceeded in the normal communication terminal and network side controlling the parameters needed by the uplink open-loop power control, which exert influences on the channels between the two terminals. The invention reduces the disturbance for the residential area, improves the system capacity, and extends the time of usage for the terminal battery, the minimum influence to the system performance is also realized.

Description

NB TDD CDMA移动通信系统端到端直接通信的功率控制的方法 NB TDD CDMA mobile communication system according to-end method for power control of direct communication

技术领域 FIELD

本发明涉及NB TDD(窄带时分双工)CDMA移动通信系统端到端直接通信的功率控制的方法。 The present invention relates to NB TDD (Narrowband Time Division Duplex) method of the CDMA mobile communication system, power control end of the direct communication.

背景技术 Background technique

端到端直接通信是移动通信系统中一种新的通信方法。 End direct communication is a mobile communication system, a new communication method. 端到端直接通信是在基站覆盖不到的地方、或者两个移动终端距离非常之近的情况下发生的;在端到端直接通信的过程中,传统意义上的基站控制和经由基站转发两移动终端业务的通信方式不复存在,取而代之的是业务流在两终端之间直接传递。 End communication occurs directly at the base station can not cover, or two mobile terminals distance very close to the situation; the end of the process of the direct communication, the base station controller and a base station via a forward two traditional sense communication service of the mobile terminal no longer exists, the traffic flow instead transmitted directly between the two terminals. 这样,由于网络侧并不能掌握端到端直接通信的信道和通信状况,所以端到端直接通信的功率控制命令都只能在终端处产生并在直接通信过程中传递给对方进行控制。 Thus, since the network side can not grasp the end of a communication channel and direct communication condition, the power control commands direct communication end are only generated at the terminal and transmitted to the other party controls direct communication. 在窄带TDD CDMA系统中,上行和下行的功率控制包括开环估计和闭环校正两种。 Narrowband TDD CDMA system, the uplink and downlink power control loop comprises an open loop estimation and correction of two kinds. 它们的主要目的是为了尽量减小远近效应,提高容量和终端的电池寿命。 Their main purpose is to minimize the near-far effect, improving battery life and capacity of the terminal.

下面以上行功率控制为例进行说明:开环估计指终端仅仅根据收到的基站的信号质量来粗略估计信道传播环境,并相应调整自己的反向发射功率,是单方面的调整。 Bottom row above as an example of power control: open loop estimation only the terminal means to approximate the channel propagation environment of the received signal quality of the base station, and to adjust their respective reverse transmission power, unilateral adjustment. 例如当终端检测到所接收的下行功率高时,通常表明它离基站较近,传播环境较好,因此终端可以降低其平均发射功率。 For example, when the terminal detects high downlink power received, that it is usually near the base station, propagation environment is better, the terminal can reduce its average transmit power. 由于无线信道的快速衰落特性,因此开环功率控制还需要更快速精确的校正,这由闭环校正来完成。 Fast fading wireless channel, open loop power control therefore still need for more rapid accurate correction, this is done by a closed loop correction. 闭环校正指在开环估计的基础之上,终端根据在下行信道上收到的功率控制指令快速调整自己的发射功率(例如每秒校正200次),其中的功率控制指令(升或降)是基站根据收到的终端上行信号的质量来决定的;由于功率控制指令由基站根据上行信道质量来产生,再通过下行信道发送到终端来调整上行发射功率,形成了控制环路,因此称这种方式为闭环校正。 It refers to a closed-loop correction based on the open-loop estimate of the terminal quickly adjust their transmit power according to power control commands received on a downlink channel (e.g., 200 times per second correction), wherein the power control command (up or down) is the base station according to the quality of the received uplink signal terminal determined; due to power control command generated by the base station based on the uplink channel quality, and then transmitted to the terminal adjusts uplink transmit power, the control loop formed by a downlink channel, so that said way closed-loop calibration.

闭环校正通常又分为内环和外环两部分。 Closed-loop correction is usually divided into two inner and outer portions. 仍以上行功率控制为例来说明。 Uplink power control is still an example to illustrate. 内环指基站接收终端信号,并将接收到的信号强度与一门限(下面称为“内环门限”)相比,如果高于该门限,则向终端发送“降低发射功率”的功率控制命令;否则发送“增加发射功率”的功率控制指令。 Base station signal receiving terminal refers to the inner ring, and the received signal strength to a threshold (hereinafter referred to as "inner Threshold") compared to if it exceeds the threshold, sending a "reduce the transmission power" power control command to the terminal ; otherwise transmitting "increase transmission power" power control commands. 外环的作用是对内环门限进行调整,这种调整是根据基站所接收到的上行信道的质量指标(如误帧率FER)的变化来进行的。 Outer ring inner ring action threshold is adjusted, this adjustment is varied according to the quality indicator of the received base station uplink channel (e.g., frame error rate FER) is carried out. 通常,FER都有一定的目标值,当实际接收的FER高于目标值时,基站就需要提高内环门限,以增加终端的上行发射功率;反之,当实际接收的FER低于目标值,基站就适当降低内环门限,以降低终端的上行发射功率。 Typically, the target FER has a certain, when the actual received FER is higher than the target value, the base station needs to increase the inner threshold, in order to increase the uplink transmit power of the terminal; conversely, when the actual received FER is lower than the target value, the base station it is appropriate to reduce the inner threshold, to reduce the uplink transmit power of the terminal. 最后,在几种机制的共同作用下,使基站能够在保证一定接收质量前提下,让终端以尽可能低的功率发射,减小对其它用户的干扰,提高容量。 Finally, under the action of several mechanisms, so that the base station can guarantee a certain quality reception premise, let the terminal transmit power as low as possible, to reduce interference to other users and improve capacity.

在NB TDD CDMA系统的功率控制中,还涉及到功率调整幅度的问题,也就是基站或者终端所发出的功率控制指令(TPC)命令的调整步长问题。 NB TDD CDMA power control system, but also to the problem of power adjustments, i.e. a base station or a terminal power control command issued (TPC) commands to adjust the step size problem. 在目前的NB TDD CDMA系统中,TPC命令所调整的步长分别为1、2、3dB。 In the current NB TDD CDMA system, TPC command adjustment step size respectively 1,2,3dB.

发明内容 SUMMARY

本发明的目的是提供一种在NB TDD CDMA移动通信系统中的端到端直接通信的功率控制方法。 Object of the present invention is to provide a power control method in the direct communication end NB TDD CDMA mobile communication system.

为实现上述目的,一种NB TDD CDMA移动通信系统端到端直接通信的功率控制的方法,包括步骤:端到端直接通信中的功率控制方式将由直接通信的两个终端来完成;正常通信中终端和网络侧进行的上下行闭环功率控制所需的参数和上行开环功率控制所需的参数,在直接通信过程中均由直接通信的两个终端产生并在两个终端之间的信道上发挥作用,网络侧不再参与对直接通信终端的具体功率控制操作。 To achieve the above object, a NB TDD CDMA mobile communication system according to-end method for power control of direct communication, comprising the steps of: controlling the power end directly by the two communication terminals to complete the direct communication; normal communication downlink closed loop power terminal and the network side and the control parameters required for uplink open loop power control parameter required, two terminals generate and direct communication channel between two terminals in direct communication process by play a role, the network side is no longer involved in the specific power control operation of direct communication terminals.

现存NB TDD CDMA移动通信标准中并没有给出对端到端直接通信进行功控的具体实现方法。 Existing NB TDD CDMA mobile communication standard does not give a specific implementation of the direct communication end power control. 由于端到端直接通信的两个主体都是移动终端,网络侧在端到端直接通信开始后并不参与对终端之间业务流的控制,包括功率控制,所以本发明中的功率控制方法改变了现有标准中功率控制的主体,针对端到端直接通信的特点,提出了对端到端直接通信的功率控制方法。 Since the two body end is a mobile terminal direct communication, the network side after the communication start end is not involved in the direct control of the traffic flow between the terminals, it includes a power control, the power control method of the present invention changes the main power control in the existing standard, the characteristics of the end-direct communication, the power control method proposed for direct communication end. 本发明降低了对小区的干扰,提高了系统容量,延长了终端的电池使用时间;对系统性能影响也最小。 The present invention reduces the interference to the cell and improve the system capacity, longer battery life time of the terminal; impact on system performance is minimal. 减少了终端和网络之间的信令开销和时间延迟,提高了效率。 Reduces the signaling overhead and time delay between the terminal and the network, improves the efficiency. 系统的改动较少,只需在终端进行功控,所以实现起来较为简单易行。 Fewer changes to the system, only power control performed at the terminal, which can be realized relatively simple.

附图说明 BRIEF DESCRIPTION

图1描述了端到端直接通信总体的功率控制方式;图2描述了端到端直接通信的外环功率控制方法;图3描述了端到端直接通信的闭环功率控制方法。 Figure 1 depicts the overall end to end in direct communication power control mode; FIG. 2 depicts an outer loop power control method of direct communication end; FIG. 3 depicts a closed loop power control method of direct communication end.

具体实施方式 Detailed ways

由于终端之间不是通过基站,而是直接通信,所以在端到端直接通信的功率控制方式中,网络侧在正常通信功率控制方式中所扮演的角色会被相应的终端所代替。 Since the role of the terminal between the base station not through, but direct communication, the end to end in direct communication power control, the network-side communication power control in the normal play mode will be replaced by the corresponding terminal. 另外由于端到端直接通信的特性,决定了两终端之间的信道环境相对于正常通信的环境普遍要好,所以它们之间功率控制的步长要小于1dB;甚至在某种方式下没有功率控制也完全可以维持端到端直接通信所需。 Further because of the characteristics of the end in direct communication determines the channel environment between the two devices with respect to the environment generally better normal communication, the power control step size between them is less than 1dB; power control is not even in some way also can maintain the desired end direct communication. 由于网络端在通信中所起的作用在端到端直接通信时为终端所替代,所以相应的功率控制功能也会由网络端移至终端处执行,并且由于位置的差异具体的实现方案也会有所不同。 Since in the communication network plays a role at the end of the alternative direct communication terminals, the corresponding power control function will be performed by the network terminal to move and position due to the difference of the specific implementation will different.

在NB TDD CDMA中基站和终端之间有Beacon channel(标志信道),所以终端可以根据beacon channel估计路径损耗;但在端到端之间通信中,由于不存在beacon channel,另外由于开环功率控制并不精确,所以端到端直接通信除了在信道建立时使用开环功率控制外,在通信过程中并不使用开环功率控制。 Between the NB TDD CDMA base station and a terminal with a Beacon channel (channel flag), so the terminal may estimate the path loss in accordance with beacon channel; communication between the end but, since the beacon channel does not exist, since the additional open loop power control is not precise, except that it is in direct communication end open loop power control channel is established, the communication process is not used in the open loop power control.

对NB TDD CDMA系统的外环功率控制来说,正常通信中上行的功率控制BLER的计算进而信噪比门限值(SIR target)的计算在RNC(无线网络控制器)处执行,而下行的功率控制则在终端处执行;在端到端直接通信的情况下,两个方向的外环功率控制都应该在相应的终端处执行,RNC完全没有必要再次参与外环功率控制。 , Then calculate the power control signal to noise ratio calculated BLER threshold (SIR target) in a normal uplink communication is performed in the RNC (Radio Network Controller) of the outer loop power control at the NB TDD CDMA system, the downlink and the power control is performed at the terminal;, outer loop power control should be performed in both directions at the corresponding end terminal in the case of direct communication, there is no need involved in the RNC outer loop power control again. 如果RNC参与端到端直接通信的外环功率控制,则会增加终端和RNC之间的信令开销和时间延迟。 If the RNC outer loop power control involved in direct communication end, will increase the signaling overhead and time delay between the terminal and the RNC.

对NB TDD CDMA系统的闭环功率控制来说,正常通信中TPC的步长是一个RRC(无线资源控制)信令,在DL(下行)DPCH(专用物理信道)功率控制中是可选的,而在UL(上行)DPCH功率控制中是强制的,并在信道建立时与外环功控参数一起由RNC传给终端;但在端到端直接通信中,网络端并不真正了解此时的信道状况,同样没有必要和可能再参与闭环功控,为减少终端和网络之间的信令开销和时间延迟,两个方向的TPC命令不仅应该都由终端产生,而且TPC的步长也应由终端来根据信道情况做出调整。 Closed loop power control of the NB TDD CDMA system, the normal communication TPC step size is a RRC (Radio Resource Control) signaling is optional in the DL (downlink) the DPCH (Dedicated Physical Channel) power control, and is a UL (up) to force the DPCH power control and outer loop power control parameter transmitted to the terminal by the RNC with the channel establishment; end, but in direct communication, at this time do not really know the network channel conditions, the same is not necessary and may be involved in re-closed loop power control, to reduce signaling overhead and time delay between the terminal and the network, not only the TPC command in both directions by the terminal should be generated, TPC step size and the terminal should also be be adjusted according to channel conditions.

考虑到端到端直接通信时两个终端距离非常近,信道环境要好于正常通信时的情况,信道的衰落并不剧烈,TPC的步长就没有必要继续沿用1、2、3dB的取值范围。 Considering the two end terminals from very close direct communication, the channel environment better than the case where normal communication is not severe fading channel, the TPC step size is no need to continue to use the range of 1,2,3dB . 这时应该考虑更小的步长,比如0.5dB,甚至0.25dB。 Then you should consider smaller steps, such as 0.5dB, even 0.25dB. 这样可以节省终端电池,并减少对附近正常通信的终端的干扰。 This saves battery terminal, and to reduce interference to normal communication in the vicinity of the terminal. 甚至当满足一定的条件,端到端直接通信的闭环功控可以暂时停止,这时终端的发射功率保持恒定。 Even when certain conditions are satisfied, the direct communication end closed loop power control can be temporarily stopped, then the transmit power of the terminal is kept constant. 本发明针对闭环功控,给出了一种实现方法。 The present invention is directed to closed loop power control, a given implementation.

针对NB TDD CDMA系统中端到端直接通信过程,由于两个终端之间的业务流并不需要网络端的转发和控制(终端和网络之间可能仍存在一些必要的信令连接),而是在两个终端之间直接传输,所以原来存在于网络端的功率控制功能应该也必须转移到相应的终端去完成。 Process for the direct communication end NB TDD CDMA system, since the traffic flows between the two terminals of the network does not require the forwarding and control (there may still be necessary signaling connection between the terminal and the network), but direct transmission between two terminals, so that originally present in the power control function of the network should be transferred to the corresponding terminals to complete.

由于端到端直接通信并不存在beacon channel,所以除了终端在直接通信建立信道之初要利用到开环功控以外,开环功率控制并不适用于端到端直接通信。 Since there is no direct communication end beacon channel, so in addition to the beginning of the terminal establishes the direct communication channel to use than the open loop power control, open loop power control is not suitable for direct communication end.

端到端直接通信采用外环功控和闭环功控,但不同于正常通信的是:·正常通信中在RNC执行的外环功控功能转移到相应的终端处执行;·正常通信中在Node B执行的闭环功控功能转移到相应的终端处执行;·相比于正常通信闭环功控,端到端直接通信应该采用更小的TPC步长甚至特定模式下暂停闭环功控;并针对端到端直接通信特点给出了一个变步长的闭环功控方案。 End in direct communication power control outer loop and closed loop power control, but is different from the normal communication: · Normal transferred to the corresponding communication terminal performs outer loop power control functions performed by RNC; - normal communication in a Node B performs closed loop power control function is transferred to a corresponding terminal performing; - compared to the normal communication power control loop, should be used end to end in direct communication TPC step size smaller closed loop power control even suspend a specific mode; and for the end characteristics of the direct mode communication is given a variable step size closed loop power control scheme.

为了解决NB TDD CDMA系统中端到端直接通信功率控制的问题,本发明提出一种功率控制方法。 To solve the problem NB TDD CDMA system end in direct communication power control, the present invention provides a power control method. 本发明系一个完整的功率控制过程,但为叙述方便起见,可以分解为以下三个方面加以说明:(1)端到端直接通信的开环功率控制在NB TDD CDMA中基站和终端之间有beacon channel,所以在正常通信中终端可以根据beacon channel估计路径损耗;但在端到端之间通信中,由于不存在beacon channel,另外由于开环功率控制并不精确,所以端到端直接通信除了在信道建立时使用开环功率控制外,在通信过程中并不使用开环功率控制。 The present invention is a complete power control process, but for the convenience of description, the decomposition may be described as the following three aspects: an open loop power (1) direct communication end control between the NB TDD CDMA base station and terminal has beacon channel, so that in a normal communication terminal can estimate the path loss beacon channel; between end communications but, since the beacon channel does not exist, since the additional open loop power control is not precise, the direct communication end except using open loop power control is established outside the channel, in the communication process does not use open loop power control.

(2)端到端直接通信的外环功率控制在端到端直接通信中,外环功率控制都在两个终端处执行,RNC不再参与外环功率控制。 (2) end of the outer loop power control direct communication in the direct communication end, the outer loop power control are performed at the two terminals, the RNC outer loop power control is no longer involved.

对NB TDD CDMA系统的外环功率控制来说,正常通信中上行的功率控制BLER(传输块误码率)的计算进而信噪比门限值(SIR target)的计算在RNC处执行,而下行的功率控制则在终端处执行;在端到端直接通信的情况下,两个方向的外环功率控制都应该在相应的终端处执行,RNC完全没有必要再次参与外环功率控制。 Calculating power control the BLER (block error rate transmission) in a normal uplink communication further calculates the SNR threshold (SIR target) for the outer loop power control is performed NB TDD CDMA system is at the RNC, and downstream power control is performed at the terminal;, outer loop power control should be performed in both directions at the corresponding end terminal in the case of direct communication, there is no need involved in the RNC outer loop power control again. 如果RNC参与端到端直接通信的外环功率控制,则会增加终端和RNC之间的信令开销和时间延迟。 If the RNC outer loop power control involved in direct communication end, will increase the signaling overhead and time delay between the terminal and the RNC.

在终端处执行的外环功率控制算法可以参考正常通信的外环功率控制算法,只不过控制的主体发生了变化。 Performing outer loop power control algorithm in the terminal can communicate properly with reference to outer loop power control algorithm, but the control body has changed. 图2给出了端到端直接通信的外环功率控制的参考算法。 Figure 2 shows the reference algorithm direct communication end loop power control.

(3)端到端直接通信的闭环功率控制端到端直接通信的闭环功率控制都在两个终端处执行,这一点完全不同于正常通信中需要Node B执行上行闭环功率控制的方式,并且TPC的步长也由终端产生并调整,RNC不再参与对TPC步长的控制。 (3) the direct communication end-to-end closed-loop power control of direct communication in a closed loop power control are performed at the two terminals, which is completely different from the normal communication mode requires Node B performs uplink closed loop power control, TPC and the generating and adjusting step length by the terminal, RNC will not participate in the control of the TPC step size.

对NB TDD CDMA系统的闭环功率控制来说,正常通信中TPC的步长是一个RRC信令,在DL(下行)DPCH功率控制中是可选的,而在UL DPCH功率控制中是强制的,并在信道建立时与外环功控参数一起由RNC传给终端;但在端到端直接通信中,Node B并不真正了解此时的信道状况,同样没有必要和可能再参与闭环功控,为减少终端和网络之间的信令开销和时间延迟,两个方向的TPC命令不仅应该都由终端产生,而且TPC的步长也应由终端产生并根据信道情况做出具体调整。 Closed loop power control of the NB TDD CDMA system, the normal communication TPC step size is a RRC signaling, the DL (downlink) the DPCH power control is optional, and the UL DPCH power control is mandatory, and when the channel is established with the terminal by the RNC transmitted power control parameter and the outer ring; end but in direct communication, Node B does not really know the channel condition at this time, the same is not necessary and may be involved in re-closed loop power control, to reduce signaling overhead and time delay between the terminal and the network, not only the TPC command in both directions by the terminal should be generated, and the TPC step size should also be the terminal generates and make adjustments according to specific channel conditions. TPC步长放在终端处,由此对终端的改动会非常小,所需的代价只不过是要存储最近的几次TPC命令。 TPC step on the terminal, which changes to the terminal will be very small, the cost is only required to store several recent TPC command.

因为考虑到端到端直接通信时两个终端距离非常近,信道环境要好于正常通信时的情况,信道的衰落并不剧烈,所以TPC的步长就没有必要继续沿用1、2、3dB的取值范围。 Because it is considered to end when the two direct communication terminals are close together, the channel environment better than the case where normal communication is not severe fading channel, the TPC step size is no need to continue with the fetch 1,2,3dB value range. 这时应该考虑更小的步长,比如0.5dB,甚至0.25dB。 Then you should consider smaller steps, such as 0.5dB, even 0.25dB. 这样可以节省终端电池,并减少对附近正常通信的终端的干扰。 This saves battery terminal, and to reduce interference to normal communication in the vicinity of the terminal. 甚至当满足一定的条件,端到端直接通信的闭环功控可以暂时停止,这时终端的发射功率保持恒定。 Even when certain conditions are satisfied, the direct communication end closed loop power control can be temporarily stopped, then the transmit power of the terminal is kept constant. 本发明针对端到端直接通信的闭环功控,给出了一种实现方法,参考图3。 The present invention is directed end direct communication closed loop power control, a given implementation, with reference to FIG.

图1描述了NB TDD CDMA系统中端到端直接通信总体的功率控制方式101正常通信中终端和网络侧进行的上下行闭环功率控制所需的参数诸如TPC命令由相应的终端和Node B来完成;上行开环功率控制所需的参数诸如路径损耗则根据Node B发出的Beacon Channel来计算;102正常通信中终端和网络侧进行的闭环功率控制中所需参数诸如TPC步长和外环功率控制中所需参数诸如上行的SIR目标门限值则由RNC计算并传递给终端;103端到端直接通信中的功率控制方式将由直接通信的两个终端来完成;在直接通信的信道建立之初,一些基本的信令初值会由网络侧传递给终端,但信道建立之后的功率则由终端独立控制,网络侧不再参与;具体的功率控制方案如下:a)信道建立时使用开环功控;b)信道建立后使用闭环功控,两个方向的TPC命令均由终端产生,TPC步长也由终端产生并调整;c) Figure 1 depicts uplink and downlink closed loop power NB TDD CDMA systems generally end in direct communication power control in the normal communication terminal 101 and the network side controls the desired parameter, such as a TPC command is completed by a respective Node B and the terminal ; TPC step size control such as power control and outer loop 102 normal communication parameters required for the terminal and the network side carried out the closed loop power; uplink open-loop power control parameters such as path loss is required to be calculated according to the Beacon Channel Node B issued the desired parameters such as the uplink SIR target threshold value calculated by the RNC and transmitted to the terminal; power control mode 103 by the end of two direct communication terminals to complete the direct communication; establishing direct communication channel at the beginning of some basic signaling the initial value is passed to the terminal by the network side, but independent control of power by the terminal, the network side after establishing a channel no longer involved; specific power control scheme is as follows: a) using the open loop power when the channel is established control; b) after establishing the channel using the closed loop power control, TPC commands in both directions by the terminal generates, TPC step size are also produced by the terminal and adjust; c) 环功控诸如SIR目标门限值的计算等也由终端完成;d)在信道环境良好,并满足一定条件时可以暂停功率控制。 Such as a power control loop SIR target threshold calculation is also performed by the terminal; D) can be suspended when the power control channel is a good environment, and certain conditions are met.

图2描述了NB TDD CDMA系统中端到端直接通信的外环功率控制方法。 Figure 2 depicts the outer loop power control method for the direct end-NB TDD CDMA communication system.

201开始202在端到端直接通信的两个终端A和B中,终端A接收到来自终端B的数据;203终端A在CRC(循环冗余校验)校验后,比较BLER的测量值与BLER目标值的大小;204如果BLER测量值大于目标值,那么增加下一个TTI的SIR目标值,调整后的结果为:Eb/N0_target(n+1)=Eb/N0_target(n)+Step_size205否则,减少下一个TTI的SIR目标值,调整后的结果为:Eb/N0_target(n+1)=Eb/N0_target(n)-Step_size206在内环功控中使用新近得到的SIR目标值(Eb/N0_target)同SIR测量值比较产生TPC命令207结束其中,Eb/N0_target(n)是第n个TTI的Eb/N0目标门限值BLER_target是呼叫的BLER目标门限值Step_size是SIR目标门限值调整的步长图3描述了端到端直接通信的闭环功率控制方法。 202 201 starts two end terminals A and B in direct communication, the terminal A receives the data from the terminal B; 203 in the terminal A after the CRC (cyclic redundancy check) checksum, and comparing the BLER measurement value BLER target size; 204 if the BLER measurement value is larger than the target, then a next TTI increasing SIR target, the result is adjusted to: Eb / N0_target (n + 1) = Eb / N0_target (n) + Step_size205 otherwise, reducing the SIR target of the next TTI, the adjusted results: Eb / N0_target (n + 1) = Eb / N0_target (n) -Step_size206 using the SIR target (Eb / N0_target) newly obtained in the inner loop power control in SIR measured value is compared with the step of generating the SIR target to adjust TPC command threshold wherein the end 207, Eb / N0_target (n) is the n-th TTI of the Eb / N0 target BLER target threshold value is a threshold value BLER_target call is Step_size Figure 3 depicts a long closed loop power control method of direct communication end.

301开始;302根据当前的TSS值,终端接收来自另一终端的TPC命令增加或者减少相应的功率;303终端接收来自另一个终端的TPC命令,并统计接收的最近M个TPC命令;304接收方判断最近M个TPC命令中是否连续有不少于N个TPC命令指示增加功率;305如果连续有不少于N个TPC命令指示增加功率,这意味着信道经历着深度衰落,那么就增加TSS值并按照新增的TSS值大幅增加功率; 301 Start; TSS 302 according to the current value, the terminal receives TPC commands from another terminal increase or decrease respective power; 303 terminal receives TPC commands from another terminal, and the M statistic recently received TPC commands; recipient 304 the M recent TPC commands is determined whether there are less than N consecutive TPC command indicates a power increase; 305 if there are less than N number of consecutive TPC command indicates a power increase, which means that the channel is experiencing deep fades, then the TSS value increases and in accordance with the new TSS value of a substantial increase in power;

306判断随后的TPC命令是否指示减少功率;307如果随后的TPC命令指示减少功率,意味着深度衰落已经结束,由于闭环功控的延迟效应,所以应该继续增加TSS,并使用新的TSS值来大幅减少功率以防止功率的过度调整,然后恢复TSS值为算法初始值并返回算法顶部;308接收方根据最近一连串接收的TPC命令,如果接收的TPC命令满足一定的模式,如功率增加和功率接收交替出现,并达到一定的次数,这意外着目前的功控在某个功率水平上上下抖动,那么就进行如下的操作:309判断TSS的取值是否已经达到最小值;310如果没有达到最小值,那么减少TSS的取值,这样可以减少功控的抖动范围,逼近理想的功率水平,并减少对小区的干扰,节省电池;311如果已经达到最小值,那么目前的功控的控制范围已经达到最小,那么可以暂停功控,保持目前的功率水平不变;312结 306 determines whether the TPC command indicates a subsequent reduction in power; 307 if a subsequent TPC command indicates a power decrease, meaning deep fading has ended, closed loop power control due to the delay effect, so it should continue to increase TSS, and use the new values ​​to significantly TSS reducing power to prevent excessive power adjustment, then the recovery value TSS algorithm initial value and top algorithm; 308 series of recent recipient of the received TPC command, if the received TPC command satisfies a certain pattern, such as alternating power increase and power reception occurs, and a certain number of times, which the current power control unexpected shake up and down at a certain power level, then the following operations: 309 determines whether the value has reached a minimum TSS; 310 reaches a minimum if not, then reducing the value of the TSS, thus reducing the jitter range of power control, approximate the desired power level, and to reduce interference to the cell, the battery save; if 311 has reached a minimum value, the control range of the current controlled power has reached a minimum , then the power control can be suspended, to maintain the current constant power level; junction 312 .

其中,TSS:TPC Step size(调整步长),功率控制命令的调整步长M,N,X:算法给定的整常数。 Wherein, TSS: TPC Step size (step size), a power adjustment step size M, N, X control command: integer constant given algorithm.

Claims (8)

1.一种NB TDD CDMA移动通信系统端到端直接通信的功率控制的方法,包括步骤:端到端直接通信中的功率控制方式将由直接通信的两个终端来完成;正常通信中终端和网络侧进行的上下行闭环功率控制所需的参数和上行开环功率控制所需的参数, 在直接通信过程中均由直接通信的两个终端产生并在两个终端之间的信道上发挥作用,网络侧不再参与对直接通信终端的具体功率控制操作。 A NB TDD CDMA mobile communication system according to-end method for power control of direct communication, comprising the steps of: controlling the power end directly by the two communication terminals to complete the direct communication; normal communication terminal and the network downlink closed loop power control performed side, and parameters required for uplink open loop power control parameters necessary for the two terminals is generated by direct communication in the direct communication process and play a role in the channel between the two terminals, the network-side operations are no longer involved in the control of the specific power direct communication terminal.
2.按权利要求1所述的方法,其特征在于在直接通信的信道建立之初,一些基本的信令初值由网络侧传递给终端,但信道建立之后的功率则由终端独立控制,网络侧不再参与。 2. The method according to claim 1, characterized in that at the beginning of the establishment of the direct communication channel, the initial value of the basic signaling transmitted by the network side to the terminal, but the power after the channel establishment is independently controlled by the terminal, the network side no longer involved.
3.按权利要求1所述的方法,其特征在于所述的端到端直接通信中的功率控制包括步骤:两个方向的TPC命令均由终端产生,TPC步长也由终端产生并调整;外环功控由终端完成。 3. The method according to claim 1, characterized in that the end of the direct communication in the power control step comprises: TPC command in two directions generated by the terminal, the TPC step size are also produced by the terminal and adjust; outer loop power control performed by the terminal.
4.按权利要求3所述的方法,其特征在于还包括步骤:在信道环境良好,并满足一定条件时暂停功率控制。 4. The method as claimed in claim 3, characterized by further comprising the step of: suspend power control channel environment good, and when certain conditions are met.
5.按权利要求3所述的方法,其特征在于所述外环功控包括步骤:在端到端直接通信的两个终端A和B中,终端A接收到来自终端B的数据;终端A在CRC校验后,比较BLER的测量值与BLER目标值的大小;如果BLER测量值大于目标值,那么增加下一个TTI的SIR目标值;否则,减少下一个TTI的SIR目标值;在内环功控中使用新近得到的SIR目标值同SIR测量值比较产生TPC命令。 5. The method as claimed in claim 3, wherein said outer loop power control comprises the steps of: in the two end terminals A and B in direct communication, the terminal A receives the data from the terminal B; terminal A after the CRC check, the BLER comparing the measured value with BLER target size; if the measured value is larger than the target BLER, then increasing the SIR target a TTI; otherwise, decrease the SIR target of the next TTI; the inner ring using the newly obtained power control SIR target SIR measured value is compared with the generated TPC commands.
6.按权利要求1所述的方法,其特征在于所述闭环功控包括步骤:根据当前的TSS值,终端接收来自另一终端的TPC命令增加或者减少相应的功率;终端接收来自另一个终端的TPC命令,并统计接收的最近M个TPC命令;接收方判断最近M个TPC命令中是否连续有不少于N个TPC命令指示增加功率;如果连续有不少于N个TPC命令指示增加功率,增加TSS值并按照新增的TSS值增加功率;判断随后的TPC命令是否指示减少功率;如果随后的TPC命令指示减少功率,继续增加TSS,并使用新的TSS值来减少功率,然后恢复TSS值为算法初始值并返回算法顶部。 6. The method as claimed in claim 1, wherein said closed loop power control comprises the steps of: based on the current value of the TSS, the terminal receives TPC commands from another terminal increase or decrease respective power; terminal receives from another terminal TPC command, and the M latest statistics received TPC commands; latest recipient determines whether there are less than N consecutive TPC command indicates a power increase in the M TPC command; if there are less than N consecutive TPC command indicates a power increase increase the value of TSS and TSS values ​​increased in accordance with the new power; then the TPC command to determine whether an indication to reduce power; if the TPC command indicates a subsequent reduction in power, TSS continues to increase, and the new TSS values ​​to reduce power, then resume TSS value and the initial value of the algorithm algorithm top.
7.按权利要求6所述的方法,其特征在于还包括步骤:接收方根据最近一连串接收的TPC命令,如果接收的TPC命令满足一定的模式,那么就进行如下的操作:判断TSS的取值是否已经达到最小值;如果没有达到最小值,那么减少TSS的取值;如果已经达到最小值,那么暂停功控,保持目前的功率水平不变。 7. The method as claimed in claim 6, characterized by further comprising the step of: the recipient of recent series of received TPC command, if the received TPC command satisfies a certain pattern, then the following operations: determination of TSS values It has reached the minimum value; if not reached the minimum value, then reduce TSS values; if the minimum has been reached, then pause power control, to maintain the current power level unchanged.
8.权利要求6所述的方法,其特征在于所述TPC的步长小于1dB。 The method according to claim 6, wherein the TPC step size is less than 1dB.
CNA031038093A 2003-02-11 2003-02-11 Power control method of end-to-end direct communication of NB TDD CDMA mobile communication system CN1522075A (en)

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CN100546214C (en) 2006-01-11 2009-09-30 华为技术有限公司 Method for open loop power control of terminal
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CN101873683B (en) 2004-08-20 2012-12-26 三星电子株式会社 Apparatus and method for adaptively changing uplink power control scheme
CN100583697C (en) 2004-10-10 2010-01-20 展讯通信(上海)有限公司 Performance estimating method and system for TD-SCDMA radio frequency system
CN100546214C (en) 2006-01-11 2009-09-30 华为技术有限公司 Method for open loop power control of terminal
CN102137330A (en) * 2010-01-21 2011-07-27 杭州华三通信技术有限公司 Method and system for debugging radio link
CN102137330B (en) 2010-01-21 2014-02-05 杭州华三通信技术有限公司 Method and system for debugging radio link
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CN107210886A (en) * 2015-01-09 2017-09-26 三星电子株式会社 The method and apparatus for transmitting the control channel for terminal in a wireless communication system

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