CN1945995A - Method for distributing channel power - Google Patents

Method for distributing channel power Download PDF

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Publication number
CN1945995A
CN1945995A CN 200510100260 CN200510100260A CN1945995A CN 1945995 A CN1945995 A CN 1945995A CN 200510100260 CN200510100260 CN 200510100260 CN 200510100260 A CN200510100260 A CN 200510100260A CN 1945995 A CN1945995 A CN 1945995A
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channel
data
crossover
sector
power
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CN 200510100260
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CN100563119C (en
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王俊伟
丁颖哲
杜高科
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

This invention discloses a distribution method for channel power including: A, determining channels distributed on a laminated adjacent sector and transmitting data to UE when a UE is at the laminated region of a sector, B, when the base station transmits data to the UE on said channel, it distributes different emission powers to said channel of adjacent sector relatively according to different channel qualities in the laminated adjacent sector.

Description

A kind of method for distributing channel power
Technical field
The present invention relates to method for distributing channel power, relate in particular to a kind of method for distributing channel power that can be applicable in the ofdm system.
Background technology
In the base station system of many sectors, (User Equipment when UE) moving to the border of sector, because the directivity of antenna can cause the received signal of UE to weaken, also is subjected to the interference of adjacent sectors in addition easily at the UE at edge, sector when subscriber equipment.The base station of one three sector is as shown in Figure 1: UE is at the crossover area of sector A and sector B, if the ownership sector of UE is A, then can be subjected to the interference of sector B, if the ownership sector of UE is sector B then can be subjected to the interference of sector A.At the edge of sector, because the influence of antenna directivity, power attenuation also increases greatly simultaneously.Therefore how to reduce the interference of crossover area UE, the power that increases received signal becomes current research focus.
With reference to shown in Figure 1, when UE moves to crossover area shown in Figure 1, the UE received power reduces little, the interference of neighbor cell increases, available technology adopting sends the method for soft merging simultaneously, i.e. sector A and sector B are on identical frequency resource and time resource, send identical data, and transmitted power equates.At the UE end, adopt the method for soft merging to demodulate data, idiographic flow mainly may further comprise the steps with reference to shown in Figure 2:
Step 11, UE measures the signal to noise ratio SINR value of adjacent two each channels of sector of crossover respectively according to pilot frequency information, and calculates the SINR value after the soft merging.
Step 12, UE selects a best SINR value and corresponding channel indexes and number feeds back to NodeB.
Step 13, NodeB puts into scheduler with the relevant information of these UE data of above-mentioned scheduling, carries out data dispatch.
Step 14 if be dispatched to the downlink data of this UE, then simultaneously send data on the channel that UE reports two sectors, and the transmitting power of distributing is identical.
There is following shortcoming in above-mentioned existing method for distributing channel power:
No matter arrive the quality of the channel quality of subscriber equipment in the prior art on adjacent two sectors of crossover, under the constant situation of total emission power, identical transmitting power is distributed in two sectors on identical channel, power system capacity can not reach maximization, and therefore the branches such as channel of two sectors are allotted the capacity that in fact power reduced system of penetrating.
Summary of the invention
The technical problem that the present invention solves provides a kind of method for distributing channel power, and the sector-edge that can reduce subscriber equipment subscriber equipment when the crossover area of sector disturbs, and improves power system capacity.
For addressing the above problem, method for distributing channel power of the present invention comprises:
A, when subscriber equipment is in the crossover area of sector, determine to be distributed on the adjacent sectors of described crossover and be used to transmit the channel that data are given subscriber equipment;
When data are transmitted to subscriber equipment in B, base station on described channel, according to described channel in the different channels quality of the adjacent sectors of described crossover the different transmitting power of the corresponding distribution of this channel to adjacent sectors.
Wherein, the adjacent sectors transmitting data of determining to be distributed in crossover described in the steps A comprises for the channel of subscriber equipment:
Subscriber equipment is measured the channel quality value of each channel at the adjacent sectors of the crossover at this subscriber equipment place;
Subscriber equipment is determined the channel that channel quality is best according to described measurement result, and the channel quality value on each adjacent sector reports the base station with described channel and this channel;
The base station determines that the best channel of described channel quality is as transmitting the channel that data are given subscriber equipment on the described crossover sector.
Wherein, described in the step B be to the different transmitting power of the corresponding distribution of the channel of adjacent sectors:
The channel emission power of distributing to the good sector of channel quality is higher than the channel emission power of the sector of distributing to bad channel quality.
Wherein, described channel quality value can be the snr value of channel.
Alternatively, the data that transmit on the described channel of the adjacent sectors of crossover are identical data.
Alternatively, the related data that generates of the data that on the described channel of the adjacent sectors of crossover, transmit code encoding method for the time according to sky.
Alternatively, the data that transmit on the described channel of the adjacent sectors of crossover are the related data that one of them sector of crossover utilizes cyclic shift to generate.
Compared with prior art, the present invention has following beneficial effect:
When subscriber equipment is in the crossover area of sector, at first determines to be distributed on the adjacent sectors of described crossover and be used to transmit the channel that data are given subscriber equipment among the present invention; When on described channel, transmitting data to subscriber equipment in the base station, according to described channel in the different channels quality of the adjacent sectors of described crossover the different transmitting power of the corresponding distribution of this channel to adjacent sectors.For the channel of the good sector of channel quality, the transmitting power height of distribution, for the channel of the sector of bad channel quality, the transmitting power of distribution is low, thereby under the constant situation of total emission power, makes the power system capacity maximization.
Description of drawings
Fig. 1 is the schematic diagram that the prior art user is in the sector of crossover;
Fig. 2 is that prior art is carried out the flow chart that channel power distributes;
Fig. 3 is that the present invention carries out the flow chart that channel power distributes.
Embodiment
The present invention can be applicable in the ofdm system of multi-transceiver technology, and the basic thought of multi-transceiver technology is that a bandwidth carrier is divided into a plurality of subcarriers, and transmits data simultaneously on a plurality of subcarriers.In the middle of the system applies of majority, the width of subcarrier should be less than the coherence bandwidth of channel, like this on frequency-selective channel, decline on each subcarrier is a flat fading, thereby reduced intersymbol interference, and do not needed complicated channel equalization, be fit to the transmission of high-speed data.Multi-transceiver technology has various ways, as OFDMA, and MC-CDMA, MC-DS-CDMA, and time-frequency domain two-dimensional expansion, and multiple expansion technique on this basis.The OFDM technology is more representational a kind of technology in the middle of the multi-transceiver technology.
Carry out the core that channel power distributes among the present invention and be when subscriber equipment is in the crossover area of sector, at first determine to be distributed on the adjacent sectors of described crossover and be used to transmit the channel of data to subscriber equipment; When data are transmitted to subscriber equipment in the base station on described channel, according to described channel in the different channels quality of the adjacent sectors of described crossover the different transmitting power of the corresponding distribution of this channel to adjacent sectors, because it is relevant at the channel quality of this sector with this channel to distribute to the channel transmitting power that is distributed in each sector, can make channel quality reach required effect, following mask body describes.
Channel quality value described in the present invention can channel signal to noise ratio SINR value characterize, when user equipment (UE) during at crossover area (as shown in Figure 1), what report among the present invention is not SINR numerical value after the soft merging, but two the SINR values of sector on same subchannel.At receiving terminal, NodeB merges new SINR value of generation with two SINR values according to certain algorithm, as the channel quality parameter of these UE data of scheduling.When sending data, carry out corresponding power according to two SINR values and distribute, rule is that the power of the high distribution of SINR value is big, and the power of low distribution is little.
With reference to figure 3, this figure is that the present invention carries out the flow chart that channel power distributes, and the channel power distribution is mainly carried out according to following steps:
Step 21, UE measures each channel SINR on two sectors respectively according to pilot frequency information.
Step 22, UE selects two best channels (being the best channel of channel quality) of SINR and feeds back to NodeB, and feedback information comprises two SINR values and channel number.The integrated value that wherein said two SINR preferably are meant two SINR is best.
Step 23, NodeB merges two SINR that receive, generates a new SINR_NEW value, and SINR_NEW participates in scheduling as the parameter of channel quality.
Step 24, NodeB carries out data packet dispatching.
Step 25, when being dispatched to the data of this UE, two sectors all send relevant data on the channel of being dispatched, and transmitting power is distributed according to two SINR values, and distribution principle is the power height of the high distribution of SINR value, and the power of the distribution that the SINR value is low is low.
Below describe with specific embodiment.
First embodiment
Characterize equally the numerical value of channel quality in the present embodiment with SINR, the method for addition is adopted in the merging of two SINR, the parameter of feedback comprises channel quality value SINRa, sector B channel quality value SINRb and the channel number of sector A.Power division is carried out corresponding distribution according to the proportion of each sector channel SINR, and the data of transmission are identical data, and idiographic flow is as follows:
1) UE measures each channel SINR value on two sectors (SINRa and SINRb) respectively according to pilot frequency information.
2) UE is to the SINR summation of each channel on two sectors, generate the merging value SINR_he (SINR_he=SINRa+SINRb) of a channel quality, and the channel number value of picking out the SINR_he of a maximum feeds back to NodeB, and feedback information comprises SINRa, SINRb and channel number.
3) NodeB adopts the method for addition to merge to two SINR that receive, generates a new SINR_he (SINR_he=SINRa+SINRb) value, and SINR_he participates in scheduling as the parameter of channel quality.
4) NodeB carries out data packet dispatching.
When 5) being dispatched to the data of this UE, two sectors all send identical data on the channel of being dispatched, transmitting power is distributed according to two SINR values, the method of distributing is: the gross power of supposing to distribute on this channel is P, the transmitting power P of sector A (a)=P*SINRa/ (SINRa+SINRb) then, the transmitting power P of sector B (b)=P*SINRb/ (SINRa+SINRb).
Second embodiment
Characterize the numerical value of channel quality in the present embodiment equally with the SINR value.Subduplicate method is adopted in the merging of two SINR, and the parameter of feedback comprises the channel quality value SINRa and the channel number of the channel quality value SINR_he of merging, serving sector.Power division is distributed according to the shared ratio of the square root of SINR, and the method for the transmission The data Space Time Coding of two sectors sends, and flow process is as follows:
1) UE measures each channel SINR value on two sectors (SINRa and SINRb) respectively according to pilot frequency information.
2) UE generates the merging value of a channel quality to the SINR extraction of square root of each channel on two sectors SINR _ he ( SINR _ he = SINRa 2 + SINR b 2 ) , And the channel number value of picking out the SINR_he of a maximum feeds back to NodeB, and feedback information comprises the channel quality value SINRa and the channel number of SINR_he, serving sector.
3) NodeB to feedback information after, SINR_he is participated in scheduling as the parameter of channel quality.
4) NodeB carries out packet scheduling.
When 5) being dispatched to the data of this UE, calculate according to SINR_he and SINRa SINRb ( SINRb = SINR _ he 2 - SINR a 2 ) Data to be sent are carried out Space Time Coding, and on the channel of two sectors, send coded data, transmitting power is distributed according to two SINR values, and the method for distribution is: the gross power of supposing to distribute on this channel is P, then the transmitting power P of sector A (a)=P*SINRa 2/ SINRa 2+ SINRb 2, the transmitting power P of sector B (b)=P*SINRb 2/ SINRa 2+ SINRb 2
Need illustrate, for reducing the interference of crossover area, the data that the present invention transmits on the described channel of the adjacent sectors of crossover are necessary for relevant data, and described relevant data can be identical data or related data that code encoding method generates for according to sky time the or the related data of utilizing the cyclic shift generation for one of them sector of crossover.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (7)

1, a kind of method for distributing channel power is characterized in that, comprising:
A, when subscriber equipment is in the crossover area of sector, determine to be distributed on the adjacent sectors of described crossover and be used to transmit the channel that data are given subscriber equipment;
When data are transmitted to subscriber equipment in B, base station on described channel, according to described channel in the different channels quality of the adjacent sectors of described crossover the different transmitting power of the corresponding distribution of this channel to adjacent sectors.
2, method for distributing channel power according to claim 1 is characterized in that, determines to be distributed in the adjacent sectors transmitting data of crossover described in the steps A and comprises for the channel of subscriber equipment:
Subscriber equipment is measured the channel quality value of each channel at the adjacent sectors of the crossover at this subscriber equipment place;
Subscriber equipment is determined the channel that channel quality is best according to described measurement result, and the channel quality value on each adjacent sector reports the base station with described channel and this channel;
The base station determines that the best channel of described channel quality is as transmitting the channel that data are given subscriber equipment on the described crossover sector.
3, method for distributing channel power according to claim 1 is characterized in that, described in the step B to the different transmitting power of the corresponding distribution of the channel of adjacent sectors is:
The channel emission power of distributing to the good sector of channel quality is higher than the channel emission power of the sector of distributing to bad channel quality.
According to each described method for distributing channel power of claim 1-3, it is characterized in that 4, described channel quality value is the snr value of channel.
5, method for distributing channel power according to claim 1 is characterized in that, the data that transmit on the described channel of the adjacent sectors of crossover are identical data.
6, method for distributing channel power according to claim 1 is characterized in that, the related data that the data that transmit on the described channel of the adjacent sectors of crossover code encoding method for according to sky the time generates.
7, method for distributing channel power according to claim 1 is characterized in that, the data that transmit on the described channel of the adjacent sectors of crossover are the related data that one of them sector of crossover utilizes cyclic shift to generate.
CNB2005101002607A 2005-10-04 2005-10-04 A kind of method for distributing channel power Active CN100563119C (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101969365A (en) * 2009-12-29 2011-02-09 南京中兴软件有限责任公司 Multi-input multi-output coding method and system
CN102098791A (en) * 2011-02-24 2011-06-15 大唐移动通信设备有限公司 Dispatching method and equipment
CN102550068A (en) * 2009-10-02 2012-07-04 三菱电机株式会社 Mobile communication system
CN103476100A (en) * 2007-08-10 2013-12-25 高通股份有限公司 Adaptation of transmit power for neighboring nodes

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103476100A (en) * 2007-08-10 2013-12-25 高通股份有限公司 Adaptation of transmit power for neighboring nodes
CN101779503B (en) * 2007-08-10 2016-08-03 高通股份有限公司 Method and apparatus for transmission power adaptation based on channel quality
US9491722B2 (en) 2007-08-10 2016-11-08 Qualcomm Incorporated Adaptation of transmit power based on channel quality
CN103476100B (en) * 2007-08-10 2017-05-03 高通股份有限公司 Transmit power adaptation method and device based on channel quality
CN102550068A (en) * 2009-10-02 2012-07-04 三菱电机株式会社 Mobile communication system
US9226221B2 (en) 2009-10-02 2015-12-29 Mitsubishi Electronic Corporation Mobile communication system
CN102550068B (en) * 2009-10-02 2016-02-10 三菱电机株式会社 Mobile communication system
US9585070B2 (en) 2009-10-02 2017-02-28 Mitsubishi Electric Corporation Mobile communication system
CN101969365A (en) * 2009-12-29 2011-02-09 南京中兴软件有限责任公司 Multi-input multi-output coding method and system
CN102098791A (en) * 2011-02-24 2011-06-15 大唐移动通信设备有限公司 Dispatching method and equipment
CN102098791B (en) * 2011-02-24 2014-10-08 大唐移动通信设备有限公司 Dispatching method and equipment

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