CN1522075A - Method for power control of end-to-end direct communication in NB TDD CDMA mobile communication system - Google Patents
Method for power control of end-to-end direct communication in NB TDD CDMA mobile communication system Download PDFInfo
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Abstract
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。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，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。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。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。
A method for power control of end-to-end direct communication in a NB TDD CDMA mobile communication system, comprising steps: the power control mode in end-to-end direct communication will be completed by two terminals of direct communication; in normal communication, the terminal and the network side perform The parameters required for the uplink and downlink closed-loop power control and the parameters required for the uplink open-loop power control are generated by the two terminals of the direct communication during the direct communication and play a role on the channel between the two terminals. The network side It no longer participates in specific power control operations for direct communication terminals. The power control method in the present invention changes the main body of power control in the existing standard, reduces the interference to the cell, improves the system capacity, prolongs the battery life of the terminal, and has the least impact on the system performance. The signaling overhead and time delay between the terminal and the network are reduced, and the efficiency is improved. There are few changes to the system, and only power control needs to be done at the terminal, so it is relatively simple and easy to implement.
Description
Technical field
The present invention relates to the method for the power control of NB TDD (arrowband time division duplex) the end-to-end direct communication of CDMA mobile communication system.
Background technology
End-to-end direct communication is a kind of new communication means in the mobile communication system.End-to-end direct communication is to take place under the very near situation of the place that do not cover in the base station or two distance of mobile terminal; In the process of end-to-end direct communication, traditional base stations control and do not existed via the communication mode that two mobile terminal services are transmitted in the base station be the substitute is Business Stream and is directly transmitted between two terminals.Like this, because network side can not be grasped the channel and the communication conditions of end-to-end direct communication,, the power control command of end-to-end direct communication controls so all can only producing and pass to the other side in the direct communication process in end.In arrowband TDD cdma system, the power of uplink and downlink control comprises that open loop estimates and closed-loop corrected two kinds.Their main purpose is in order to reduce near-far interference, the battery life of raising capacity and terminal as far as possible.
Being controlled to be example with ascending power below describes: open loop estimates to refer to that terminal only comes rough estimate dissemination channel environment according to the signal of base station quality of receiving, and the back emitted power of corresponding adjustment oneself, is one-side adjustment.For example detect the descending power that is received when high when terminal, show that usually it is nearer from the base station, communication environments is better, so terminal can reduce its average transmit power.Because the quick fading characteristic of wireless channel, so open Loop Power control also needs quicker accurate correction, and this is finished by closed-loop corrected.Closed-loop corrected finger is on the basis that open loop is estimated, terminal is according to the transmitting power (for example per second is proofreaied and correct 200 times) of the power control instruction rapid adjustment oneself received on down channel, and power control instruction wherein (rise or fall) is that the quality of the terminal upward signal received of base station basis decides; Because power control instruction is produced according to uplink signal-channel quality by the base station, sends to terminal by down channel again and adjusts uplink transmission power, has formed control loop, therefore claim that this mode is closed-loop corrected.
Closed-loop corrected interior ring and outer shroud two parts of being divided into again usually.Still be controlled to be example explanation with ascending power.Interior fourth finger base station receiving terminal signal, and the signal strength signal intensity that receives and a thresholding (below be called " interior ring gate limit ") compared, if be higher than this thresholding, then send the power control command of " reduction transmitting power " to terminal; Otherwise send the power control instruction of " increase transmitting power ".The effect of outer shroud is that internal ring gate limit is adjusted, and this adjustment is to carry out according to the variation of the quality index of the received up channel in base station (as frame error rate FER).Usually, FER has certain desired value, and when the FER of actual reception was higher than desired value, ring gate limit in the base station just needs to improve was to increase the uplink transmission power of terminal; Otherwise ring gate limit in the FER of actual reception is lower than desired value, and the base station just suitably reduces is to reduce the uplink transmission power of terminal.At last, under the acting in conjunction of several mechanism, make the base station reduce interference, the raising capacity guaranteeing to allow terminal with alap power emission under certain quality of reception prerequisite to other user.
In the control of the power of NB TDD cdma system, also relate to the problem of power adjusting range, the adjustment step-length problem of base station or terminal power control instruction (TPC) order of sending just.In present NB TDD cdma system, the step-length that TPC order is adjusted is respectively 1,2,3dB.
Summary of the invention
The Poewr control method that the purpose of this invention is to provide a kind of end-to-end direct communication in NB TDD CDMA mobile communication system.
For achieving the above object, the method for the power of the end-to-end direct communication of a kind of NB TDD CDMA mobile communication system control comprises step:
Power control mode in the end-to-end direct communication will be finished by two terminals of direct communication;
Required parameter and the required parameter of up open Loop Power control of up-downgoing closed power control that terminal and network side carry out in the proper communication, produce by two terminals of direct communication in the direct communication process and play a role on the channel between two terminals, network side no longer participates in the concrete power control operation to the direct communication terminal.
Do not provide the specific implementation method of end-to-end direct communication being carried out power control in the existing NB TDD cdma mobile communication standard.Because two main bodys of end-to-end direct communication all are portable terminals, the control of Business Stream between network side does not participate in terminal after end-to-end direct communication begins, comprise power control, so the Poewr control method among the present invention has changed the main body of power control in the existing standard, at the characteristics of end-to-end direct communication, the Poewr control method to end-to-end direct communication has been proposed.The present invention has reduced the interference to the sub-district, has improved power system capacity, has prolonged the battery service time of terminal; Also minimum to the systematic function influence.Reduce signaling consumption and time delay between terminal and the network, improved efficient.The change of system is less, only needs to carry out power control in terminal, so implement comparatively simple.
Description of drawings
Fig. 1 has described the overall power control mode of end-to-end direct communication;
Fig. 2 has described the outer-loop power controlling method of end-to-end direct communication;
Fig. 3 has described the close-loop power controlling method of end-to-end direct communication.
Embodiment
Because between the terminal is not by the base station, but direct communication, so in the power control mode of end-to-end direct communication, network side institute's role in the proper communication power control mode can be replaced by relevant terminal.In addition because the characteristic of end-to-end direct communication has determined that the channel circumstance between two terminals generally will be got well with respect to the environment of proper communication, so the step-length of power control is less than 1dB between them; Even there do not have power control also can keep end-to-end direct communication fully under certain mode to be required.Because network terminal role in communication is substituted by terminal when end-to-end direct communication, carry out so corresponding control function of power also can move to end by network terminal, and because the concrete implementation of difference of position also can be different.
Beacon channel (perch channel) is arranged, so terminal can be according to beacon channel estimating path loss between base station and the terminal in NB TDD CDMA; But between end-to-end, communicating by letter, owing to there is not beacon channel, in addition owing to open Loop Power control and inaccuracy, so end-to-end direct communication is not used open Loop Power control except using the open Loop Power control in communication process when channel is set up.
Concerning the exterior ring power control of NB TDD cdma system, the calculating of up power control BLER and then the calculating of signal-noise ratio threshold value (SIR target) are located to carry out at RNC (radio network controller) in the proper communication, and descending power control is then carried out in end; Under the situation of end-to-end direct communication, the control of the exterior ring power of both direction all should be carried out at the relevant terminal place, and RNC there is no need to participate in once more exterior ring power control fully.If RNC participates in the exterior ring power control of end-to-end direct communication, then can increase signaling consumption and time delay between terminal and the RNC.
Concerning the closed power control of NB TDD cdma system, the step-length of TPC is a RRC (Radio Resource control) signaling in the proper communication, in the control of DL (descending) DPCH (DPCH) power is optional, and in the control of UL (up) DPCH power, be compulsory, and when setting up, channel passes to terminal by RNC with the external circule power control parameter; But in end-to-end direct communication, network terminal is not really understood the channel conditions of this moment, there is no need equally and may participate in closed-loop power control again, for reducing signaling consumption and the time delay between terminal and the network, the TPC order of both direction not only should all be produced by terminal, and the step-length of TPC also should be adjusted according to channel situation by terminal.
Two terminals distances are very near when considering end-to-end direct communication, the situation when channel circumstance is better than proper communication, and the decline of channel is inviolent, and the step-length of TPC just there is no need to continue to continue to use 1,2, the span of 3dB.At this moment should consider littler step-length, such as 0.5dB, even 0.25dB.Can save end cell like this, and reduce interference near the terminal of proper communication.Even when meeting some requirements, the closed-loop power control of end-to-end direct communication can temporarily stop, and at this moment the transmitting power of terminal keeps constant.The present invention is directed to closed-loop power control, provided a kind of implementation method.
At end-to-end direct communication process in the NB TDD cdma system, do not need the forwarding and the control (may still exist some necessary signalings to connect between terminal and the network) of network terminal owing to the Business Stream between two terminals, but directly transmission between two terminals should also must be transferred to relevant terminal and goes to finish so be present in the control function of power of network terminal originally.
Because there is not beacon channel in end-to-end direct communication, so exist except terminal
Direct communication will use beyond the open loop power control at the beginning of setting up channel, and open Loop Power control is not
Be applicable to end-to-end direct communication.
Be:
The external circule power control function of carrying out at RNC in the proper communication is transferred to the relevant terminal place and is held
OK;
The closed-loop power control function of carrying out at Node B in the proper communication is transferred to the relevant terminal place
Carry out;
Than the proper communication closed-loop power control, end-to-end direct communication should be adopted littler TPC
Suspend closed-loop power control under step-length even the AD HOC; And at end-to-end direct communication spy
Point has provided the closed-loop power control scheme of a variable step.
In order to solve the problem of end-to-end direct communication power control in the NB TDD cdma system, the present invention proposes a kind of Poewr control method.The present invention is a complete power control process, but for sake of convenience, can be decomposed into following three aspects and be illustrated:
(1) open Loop Power control of end-to-end direct communication
In NB TDD CDMA, between base station and the terminal beacon channel is arranged, so terminal can be according to beacon channel estimating path loss in proper communication; But between end-to-end, communicating by letter, owing to there is not beacon channel, in addition owing to open Loop Power control and inaccuracy, so end-to-end direct communication is not used open Loop Power control except using the open Loop Power control in communication process when channel is set up.
(2) exterior ring power of end-to-end direct communication control
In end-to-end direct communication, exterior ring power control is all carried out two end, and RNC no longer participates in exterior ring power control.
Concerning the exterior ring power control of NB TDD cdma system, the calculating of the calculating of up power control BLER (the transmission block error rate) and then signal-noise ratio threshold value (SIR target) is carried out at the RNC place in the proper communication, and descending power control is then carried out in end; Under the situation of end-to-end direct communication, the control of the exterior ring power of both direction all should be carried out at the relevant terminal place, and RNC there is no need to participate in once more exterior ring power control fully.If RNC participates in the exterior ring power control of end-to-end direct communication, then can increase signaling consumption and time delay between terminal and the RNC.
Can be in the exterior ring power control algolithm that end is carried out with reference to the exterior ring power control algolithm of proper communication, only variation has taken place in Kong Zhi main body.Fig. 2 has provided the reference algorithm of the exterior ring power control of end-to-end direct communication.
(3) closed power of end-to-end direct communication control
The closed power control of end-to-end direct communication is all carried out two end, this point is different from the mode that needs Node B to carry out uplink closed loop in the proper communication fully, and the step-length of TPC is also produced and is adjusted by terminal, and RNC no longer participates in the control to the TPC step-length.
Concerning the closed power control of NB TDD cdma system, the step-length of TPC is a RRC signaling in the proper communication, in the control of DL (descending) DPCH power is optional, and in the control of UL DPCH power, be compulsory, and when setting up, channel passes to terminal by RNC with the external circule power control parameter; But in end-to-end direct communication, Node B does not really understand the channel conditions of this moment, there is no need equally and may participate in closed-loop power control again, for reducing signaling consumption and the time delay between terminal and the network, the TPC order of both direction not only should all be produced by terminal, and the step-length of TPC also should be made concrete adjustment by the terminal generation and according to channel situation.The TPC step-length is placed on end, and is very little to the change meeting of terminal thus, and required cost only will be stored the nearest order of TPC several times.
Because two terminals distances are very near when considering end-to-end direct communication, the situation when channel circumstance is better than proper communication, the decline of channel is inviolent, so the step-length of TPC just there is no need to continue to continue to use 1,2, the span of 3dB.At this moment should consider littler step-length, such as 0.5dB, even 0.25dB.Can save end cell like this, and reduce interference near the terminal of proper communication.Even when meeting some requirements, the closed-loop power control of end-to-end direct communication can temporarily stop, and at this moment the transmitting power of terminal keeps constant.The present invention is directed to the closed-loop power control of end-to-end direct communication, provided a kind of implementation method, with reference to figure 3.
Fig. 1 has described the overall power control mode of end-to-end direct communication in the NB TDD cdma system
Required parameter such as the TPC order of the up-downgoing closed power control that terminal and network side carry out in 101 proper communications is finished by relevant terminal and Node B; Required parameter such as the path loss of up open Loop Power control is then calculated according to the Beacon Channel that Node B sends;
Terminal is calculated and passed to desired parameters such as up sir target threshold value then by RNC during desired parameters such as TPC step-length and exterior ring power were controlled in the closed power control that terminal and network side carry out in 102 proper communications;
Power control mode in the 103 end-to-end direct communications will be finished by two terminals of direct communication; At the beginning of the channel of direct communication was set up, some basic signaling initial values can pass to terminal by network side, but the power of channel after setting up then independently controlled by terminal, and network side no longer participates in; Concrete power control scheme is as follows: use open loop power control when a) channel is set up; B) channel is set up the back and is used closed-loop power control, and the TPC order of both direction produces by terminal, and the TPC step-length is also produced and adjusted by terminal; C) calculating of external circule power control such as sir target threshold value etc. is also finished by terminal; D) good at channel circumstance, and can suspend power control when satisfying certain condition.
Fig. 2 has described the outer-loop power controlling method of end-to-end direct communication in the NB TDD cdma system.
201 beginnings
202 in two terminal A and B of end-to-end direct communication, and terminal A receives the data of self terminal B;
203 terminal A compare the measured value of BLER and the size of BLER desired value after CRC (cyclic redundancy check (CRC)) verification;
If 204 BLER measured values are greater than desired value, increase the sir target value of next TTI so, adjusted result is: Eb/N0_target (n+1)=Eb/N0_target (n)+Step_size205 otherwise, reduce the sir target value of next TTI, adjusted result is:
Eb/N0_target(n+1)＝Eb/N0_target(n)-Step_size
206 use the sir target value (Eb/N0_target) that obtains recently relatively to produce the TPC order with the sir measurement value in inner-loop power control
207 finish
Wherein, Eb/N0_target (n) is that the Eb/N0 target door limit value BLER_target of n TTI is that the BLER target door limit value Step_size that calls out is the step-length that the sir target threshold value is adjusted
Fig. 3 has described the close-loop power controlling method of end-to-end direct communication.
301 beginnings;
302 according to current TSS value, and the TPC order that terminal receives from another terminal increases or reduce corresponding power;
303 terminals receive the TPC order from another terminal, and nearest M the TPC that statistics receives orders;
Whether 304 recipients judge has the N of being no less than a TPC order indication to increase power continuously in nearest M the TPC order;
If 305 have the N of being no less than a TPC order indication to increase power continuously, this means that channel is experiencing the deep fading, so just increase the TSS value and significantly increase power according to newly-increased TSS value;
306 judge whether TPC order subsequently indicates minimizing power;
If 307 subsequently TPC order indications reduce power, mean that the deep fading finishes, because the late effect of closed-loop power control, so should continue to increase TSS, and use new TSS value significantly to reduce power to prevent the excessive adjustment of power, recover the TSS value then and be algorithm initial value and return the algorithm top;
308 recipients are according to the TPC order of nearest a succession of reception, if certain pattern is satisfied in the TPC that receives order, increase and alternately appearance of power reception as power, and reach certain number of times, this accident present power control shake up and down on certain power level, so just carries out following operation:
309 judge whether the value of TSS has reached minimum value;
If 310 do not reach minimum value, reduce the value of TSS so, can reduce the jitter range of power control like this, approach desirable power level, and reduce interference the sub-district, save battery;
If 311 have reached minimum value, it is minimum that the control range of so present power control has reached, and can suspend power control so, keeps present power level constant;
312 finish.
Wherein, TSS:TPC Step size (adjustment step-length), the adjustment step-length M of power control command, N, X: the integer constant that algorithm is given.
Claims (8)
1. the method for the power of the end-to-end direct communication of NB TDD CDMA mobile communication system control comprises step:
Power control mode in the end-to-end direct communication will be finished by two terminals of direct communication;
Required parameter and the required parameter of up open Loop Power control of up-downgoing closed power control that terminal and network side carry out in the proper communication, produce by two terminals of direct communication in the direct communication process and play a role on the channel between two terminals, network side no longer participates in the concrete power control operation to the direct communication terminal.
2. by the described method of claim 1, it is characterized in that some basic signaling initial values pass to terminal by network side at the beginning of the channel of direct communication is set up, but the power of channel after setting up controlled independently by terminal then, network side no longer participates in.
3. by the described method of claim 1, it is characterized in that the power control in the described end-to-end direct communication comprises step:
The TPC order of both direction produces by terminal, and the TPC step-length is also produced and adjusted by terminal;
External circule power control is finished by terminal.
4. by the described method of claim 3, it is characterized in that also comprising step: good at channel circumstance, and suspend power control when satisfying certain condition.
5. by the described method of claim 3, it is characterized in that described external circule power control comprises step:
In two terminal A and B of end-to-end direct communication, terminal A receives the data of self terminal B;
Terminal A compares the measured value of BLER and the size of BLER desired value after CRC check;
If the BLER measured value, increases the sir target value of next TTI so greater than desired value;
Otherwise, reduce the sir target value of next TTI;
In inner-loop power control, use the sir target value that obtains recently relatively to produce the TPC order with the sir measurement value.
6. by the described method of claim 1, it is characterized in that described closed-loop power control comprises step:
According to current TSS value, the TPC order that terminal receives from another terminal increases or reduces corresponding power;
Terminal receives the TPC order from another terminal, and nearest M the TPC that statistics receives orders;
Whether the recipient judges has the N of being no less than a TPC order indication to increase power continuously in nearest M the TPC order;
If have the N of being no less than a TPC order indication to increase power continuously, increase the TSS value and increase power according to newly-increased TSS value;
Judge whether TPC order subsequently indicates minimizing power;
If the order indication of TPC subsequently reduces power, continuing increases TSS, and uses new TSS value to reduce power, and to recover TSS value then be the algorithm initial value and return the algorithm top.
7. by the described method of claim 6, it is characterized in that also comprising step:
The recipient if certain pattern is satisfied in the TPC that receives order, so just carries out following operation according to the TPC order of nearest a succession of reception:
Whether the value of judging TSS has reached minimum value;
If do not reach minimum value, reduce the value of TSS so;
If reached minimum value, suspend power control so, keep present power level constant.
8. the described method of claim 6, the step-length that it is characterized in that described TPC is less than 1dB.
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| CN100373806C (en) * | 2005-11-02 | 2008-03-05 | 中兴通讯股份有限公司 | High-speed shared control channel and high-speed shared information channel power control implementation method |
| 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 |
| 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 |
| CN103096447A (en) * | 2011-11-01 | 2013-05-08 | 财团法人资讯工业策进会 | Mobile Apparatus, Base Station, Direct Communication System And Power Control Method Thereof |
| CN103139889A (en) * | 2011-11-28 | 2013-06-05 | 华为技术有限公司 | Power control method, user equipment, base station and communication system of dimension to dimension (D2D) |
| CN107210886A (en) * | 2015-01-09 | 2017-09-26 | 三星电子株式会社 | Method and device for transmitting control channel for terminal in wireless communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN100373806C (en) * | 2005-11-02 | 2008-03-05 | 中兴通讯股份有限公司 | High-speed shared control channel and high-speed shared information channel power control implementation method |
| 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 |
| CN103096447A (en) * | 2011-11-01 | 2013-05-08 | 财团法人资讯工业策进会 | Mobile Apparatus, Base Station, Direct Communication System And Power Control Method Thereof |
| CN103096447B (en) * | 2011-11-01 | 2016-07-20 | 财团法人资讯工业策进会 | Mobile device, base station, Direct Communication system and Poewr control method thereof |
| CN103139889A (en) * | 2011-11-28 | 2013-06-05 | 华为技术有限公司 | Power control method, user equipment, base station and communication system of dimension to dimension (D2D) |
| CN107210886A (en) * | 2015-01-09 | 2017-09-26 | 三星电子株式会社 | Method and device for transmitting control channel for terminal in wireless communication system |
| US10536242B2 (en) | 2015-01-09 | 2020-01-14 | Samsung Electronics Co., Ltd | Method and apparatus for performing repetitive transmission of information in time division duplex based cell in wireless communication system |
| CN107210886B (en) * | 2015-01-09 | 2020-12-08 | 三星电子株式会社 | Method and apparatus for transmitting a control channel for a terminal in a wireless communication system |
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