CN100556196C - Definite method of channel quality indication in a kind of high speed descending grouping access system - Google Patents

Definite method of channel quality indication in a kind of high speed descending grouping access system Download PDF

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CN100556196C
CN100556196C CNB2007100743201A CN200710074320A CN100556196C CN 100556196 C CN100556196 C CN 100556196C CN B2007100743201 A CNB2007100743201 A CN B2007100743201A CN 200710074320 A CN200710074320 A CN 200710074320A CN 100556196 C CN100556196 C CN 100556196C
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subframe
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sir
quality indication
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CN101052222A (en
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梁立宏
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Shenzhen ZTE Microelectronics Technology Co Ltd
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Abstract

The invention discloses definite method of channel quality indication in a kind of high speed descending grouping access system, may further comprise the steps: 1, UE detects the HS-SCCH of the i+1 time HSDPA process i+1 subframe I+1, wherein, i is a natural number; 2, UE is according to HS-SCCH I+1Decoded result receive corresponding HS-PDSCH I+1On information, calculate and preserve the HS-DSCH of i+1 subframe I+1SIR I+13, the signal interference ratio SIR_PRE of the HS-DSCH of i+2 HSDPA process of prediction I+24, according to SIR_PRE I+2Reach the SIR and the CQI table of comparisons and determine the CQI of the i+2 time HSDPA process I+2, and pass through HS-SICH iSend to the base station.Technical scheme of the present invention has improved the accuracy of CQI, thereby has improved the systematic function decline that the CQI non real-time causes to a certain extent.

Description

Definite method of channel quality indication in a kind of high speed descending grouping access system
Technical field
The present invention relates to a kind of definite method of channel quality indication, definite method of channel quality indication in especially a kind of high speed descending grouping access system.
Background technology
In order to satisfy user's demand growing to high-speed packet data service, 3GPP (the3rd Generation Partner Project, third generation partner program) introduced high speed downlink packet access technology of HSDPA (High Speed Downlink Packet Access, high speed downlink packet inserts) among the R5.For TD-SCDMA (Time Division Synchronous CodeDivision Multiple Access, TD SDMA inserts), HSDPA mainly is by introducing high speed downlink packet shared channel HS-DSCH (High Speed Downlink SharedChannel, high speed descending sharing channel) strengthens air interface, simultaneously, introduce HS-SCCH (High speed Shared Control Channel for HS-DSCH, High-Speed Shared Control Channel) and HS-SICH (High speed Shared Information Channel for HS-DSCH, high-speed shared information channel) finishes control corresponding, and increase the function corresponding entity at Node B (B node, promptly usually said base station) and finish.It seems from physical layer, mainly be to adopt AMC (Adaptive Modulation and Coding, the Adaptive Modulation volume) technology, HARQ (Hybrid Automatic Repeat reQuest, mix automatic repeat requests) technology and FCS (Fast Cell Selection, fast cell is selected) technology increases the throughput of data.
3GPP TS 25.224 regulations for HS-DSCH, are selected modulation scheme and suitable transmission rate by the high level that is positioned at Node B.This will realize by transmission block size, modulation system and the Radio Resource that it is suitable that high level is selected HS-DSCH.The selection of parameter can be carried out based on the channel quality indicator (CQI) (ChannelQuality Indicator, channel quality indication) that UE (User Equipment, subscriber equipment) reports.The whole link adaptive process of HS-DSCH comprises Node B and UE two parts:
Node B process:
(1) Node B sends HS-SCCH, and carrying UE identification number is used to refer to TTI (Transmission Time Interval, the Transmission Time Interval) position of the HS-DSCH of UE distribution above.If UE obtains continuous HS-DSCH transmitting and scheduling, will use identical HS-SCCH as control channel.
(2) Node B sends HS-DSCH, and its Radio Resource that uses is gone up the Radio Resource of indication as HS-SCCH.
(3) Node B receives the HS-SICH of object UE, and the status report (ACK/NACK and CQI) that HS-SICH is carried sends high level to.
The UE process:
(1) UE obtains high-rise the indication when needing monitoring HS-SCCH, begins to monitor all concentrated HS-SCCH channels of HS-SCCH of high-rise configuration.
(2) in case receive CRC (Cyclic Redundancy Check, cyclic redundancy check (CRC) code) correct HS-SCCH, UE will read the information of the HS-PDSCH corresponding with this HS-SCCH (High Speed Physics Downlink Shared Channel, high-speed physical downlink shared channel (HS-PDSCH)).Corresponding relation between the HS-PDSCH that HS-SCCH controlled is provided by high level.If receive the HS-SCCH of crc error, UE will be discarded in HS-SCCH and go up the data that receive, and continue monitoring HS-SCCH collection.
(3) receive HS-PDSCH, UE will produce ACK NACK (confirm non-affirmation) information and on corresponding HS-SICH, sending to Node B together with the CQI information that time recently obtains.
CQI provides by transmitting the estimated value of the code rate that can maximize the single transmission throughput that HS-DSCH decoding obtains last time for Node B.3GPP TS 25.224 regulations report process as follows:
(1) UE obtains the resource allocation conditions of next HS-DSCH by the HS-SCCH message that receives this user.
(2) UE receives this user's HS-DSCH, and by the CQI that measures of necessity, the purpose that CQI estimates is exactly the single transmission throughput that obtains maximum under BLER (Block Error Rate, the Block Error Rate of transmission channel) is not more than 10% prerequisite.
(3) CQI of corresponding HS-DSCH report, UE should be sending on an available HS-SICH that HS-DSCH transmits subsequently, unless HS-SICH is being close to last transmission time slot of HS-DSCH, in this case, UE will use next available HS-SICH to transmit.
3GPP TS 25.221 has provided the timing relationship between each correlated channels of HSDPA:
(1) correspondence effectively HS-PDSCH distribution next time, the corresponding gap information of HS-DSCH carries on HS-SCCH, this information provides according to a restriction: to an appointment UE, the skew of a nHS-SCCH 〉=3 time slots is arranged in time between the HS-DSCH of the HS-SCCH that carries the HS-DSCH corresponding information and first indication.
(2) UE effectively follows on the HS-SICH at the next one and sends the corresponding ACK/NACK of HS-DSCH and need following qualification: specify UE to one, the skew of a nHS-SICH 〉=9 time slots is in the end arranged between the HS-PDSCH of a distribution and the HS-SICH in time.
Fig. 1 is a kind of three continuous HSDPA subframe timing relationship schematic diagrames.
According to top description, in order to obtain correct CQI value, a kind of method is SIR (the Signal Interference Ratio that UE estimates the HS-PDSCH channel earlier, signal interference ratio), then according to the HS-PDSCH signal interference ratio, from SIR-CQI value mapping table, choose corresponding C QI value, and the modulation used of the information content of the HS-SCCH that decision issues according to this CQI and HS-DSCH and the Radio Resource of coded system and use.
For convenience of description, complete HSDPA course of work of definition is:
(1) Node B sends HS-SCCH;
(2) Node B sends HS-DSCH, uses HS-SCCH to go up the Radio Resource of indication;
(3) UE receives HS-SCCH and follows descending DPCH (Dedicated PhysicalChannel, DPCH);
(4) UE will read the information of the HS-PDSCH corresponding with this HS-SCCH;
(5) receive HS-PDSCH, UE will produce and send to Node B on the HS-SICH;
(6) Node B receives the HS-SICH of UE, and the status report (comprising ACK/NACK and CQI) that HS-SICH is carried sends high level to.
As shown in Figure 2, the HSDPA handling process of UE comprises:
(1) as 201, UE detects the HS-SCCH of i the HSDPA course of work i subframe i
(2) as 202, according to HS-SCCH iDecoded result receives corresponding HS-PDSCH iOn information;
(3), receive HS-PDSCH as 203 i, UE will produce corresponding HS-SICH I-1Send to Node B;
(4) as 204, UE begins to receive the HS-SCCH of i+1 the HSDPA course of work i+1 subframe I+1, system enters i+1 the HSDPA course of work.
Know that by 3GPP TS 25.224 definite principle of CQI should be to have maximum transmission block at the BLER that guarantees HS-DSCH under less than 10% prerequisite.By the description of front and Fig. 1, Fig. 2 as can be known, HS-DSCH iLast time slot and HS-SICH iBetween the interval should be at least 9 time slots, that is to say because UE has the time-delay of 9 time slots at least to the process of Node B reporting channel quality, because mobile channel has time-varying characteristics, even the UE that is obtained by HS-DSCH is accurately to the measurement of channel quality, the modulation that reports, coded system also can be inconsistent with current channel quality.And the AMC of HSDPA is very responsive to the sum of errors time delay of channel measurement.In order to select suitable modulation and coded system, scheduler program must be known channel quality condition.This just means that when channel estimating is inaccurate scheduler program can be selected wrong modulation coding mode, and the system that makes can not be adaptive to the variation of channel, not only can not play optimization function, can make performance poorer on the contrary.
Summary of the invention
The technical problem to be solved in the present invention provides definite method of channel quality indication in a kind of high speed descending grouping access system that can improve the CQI accuracy.
The technical solution adopted for the present invention to solve the technical problems is:
Definite method of channel quality indication in a kind of high speed descending grouping access system may further comprise the steps:
1.1 subscriber equipment detects the high-speed shared control channel HS-SCCH of the i+1 time high speed downlink packet access procedure i+1 subframe I+1, wherein i is a natural number;
1.2 subscriber equipment is according to HS-SCCH I+1Decoded result receive corresponding high-speed physical downlink shared channel (HS-PDSCH) HS-PDSCH I+1On information, calculate and preserve the high speed downlink shared channel HS-DSCH of i+1 subframe I+1Signal interference ratio SIR I+1
1.3 according to the signal interference ratio SIR that obtains in the step 1.2 I+1, adopt linear prediction method or, predict the high speed downlink shared channel HS-DSCH of i+2 high speed downlink packet access procedure according to the variation of channel estimating energy I+2Signal interference ratio SIR_PRE I+2
1.4 according to SIR_PRE I+2Reach signal interference ratio and the channel quality indication table of comparisons and determine the channel quality indication of the i+2 time high speed downlink packet access procedure, and send to the base station by the high-speed shared information channel of i subframe.
In the such scheme, in the step 1.2, if there are two or more continuous HS-DSCH I+1, then described SIR I+1Be whole HS-DSCH I+1The average of signal interference ratio.
In the such scheme, the SIR_PRE in the step 1.3 I+2Signal interference ratio by the high speed descending sharing channel in the i+2 time and preceding each time high speed downlink packet access procedure is that the function of independent variable obtains.
In the such scheme, the SIR_PRE in the step 1.3 I+2Can obtain by following steps:
4.1 subscriber equipment detects the channel estimating impulse response h of the Primary Common Control Physical Channel of the descending time slot obtain preceding each subframe of i+2 subframe and i+2 subframe M, t 1, h M, t 2..., h M, t n, calculate t time slot of m subframe the channel impulse response energy and: p m , t = Σ k = 1 n | h m , t k | 2 , Wherein, n is the multipath number of choosing, and m is the subframe sequence number, and t is a descending time slot number;
4.2 by independent variable is p M, tEach descending time slot at high speed descending sharing channel place of described i+2 the subframe of function prediction on p M, tAverage p I+2, wherein, m is the subframe sequence number, t is a descending time slot number;
4.3 pass through with p I+2And the p on each descending time slot at the signal interference ratio of the high speed descending sharing channel of i+2 preceding each subframe of subframe and its place M, tAverage be the function prediction SIR_PRE of independent variable I+2, wherein, m is the subframe sequence number, t is a descending time slot number.
In the such scheme, described function is linear function or endless impulse response function.
In the such scheme, predict p in the step 4.2 I+2Adopt linear prediction function or extrapolation function.
In the such scheme, when channel circumstance changes when very fast, preceding each subframe of described i+2 subframe is an i+1 subframe.
In the such scheme, the described signal interference ratio and the channel quality indication table of comparisons are prefabricated according to emulation or measured result.
Beneficial effect of the present invention mainly shows: technical scheme provided by the invention is utilized TD-SCDMA system descending channel correlation in time, by joint-detection and according to down channel estimated value that detects and the SIR on the HS-DSCH, SIR on the prediction descending HS-DSCH in future, SIR according to prediction determines CQI among the up HS-SICH, thereby determines the modulation coding mode that content that HS-SCCH in the future issues and corresponding HS-DSCH adopt, the transformat and the Radio Resource of use.By prediction, improved the accuracy of CQI, thereby improved the systematic function decline that the CQI non real-time causes to a certain extent.
Description of drawings
Fig. 1 is three continuous HSDPA subframe timing relationship schematic diagrames;
Fig. 2 is a UE side HSDPA workflow in the prior art;
Fig. 3 is UE side HSDPA workflow flow process among the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
With reference to shown in Figure 3, definite method of channel quality indication in a kind of high speed descending grouping access system may further comprise the steps:
Step 1: as 301, UE detects the HS-SCCH of the i+1 time HSDPA course of work i+1 subframe I+1, wherein i is a natural number;
Step 2: as 302, UE is according to HS-SCCH I+1Decoded result receives corresponding HS-PDSCH I+1On information, calculate HS-DSCH i+1 subframe iSignal interference ratio SIR I+1, and preserve SIR I+1Value is an example with the subframe among Fig. 1, has two continuous HS-DSCH in the i+1 subframe I+1: TS5 and TS6, then SIR I+1Be calculated as follows:
SIR i+1＝(SIR i+1，TS5+SIR i+1，TS6)/2
Wherein, SIR I+1, TS5And SIR I+1, TS6It is respectively the signal interference ratio of descending time slot TS5 and TS6 in the i+1 subframe;
Step 3:, predict the HS-DSCH of the i+2 time HSDPA course of work as 303 I+2Signal interference ratio SIR_PRE I+2, Forecasting Methodology can be following two kinds:
Method one: the SIR according to the HS-DSCH in the i+2 time and preceding each time HSDPA course of work is the function prediction SIR_PRE of independent variable I+2At this, adopt SIR I+1And SIR iUtilize linear prediction to determine SIR_PRE I+2, can determine as follows:
SIR_PRE i+2＝SIR i+1+(SIR i+1-SIR i)
Certainly, adopt other method such as IIR filtering also can realize same effect.
Method two: at first, UE detects the channel estimating impulse response h of the TS0 time slot of the descending time slot obtain preceding each subframe of i+2 subframe and i+2 subframe M, t 1, h M, t 2..., h M, t n, calculate t time slot of m subframe the channel impulse response energy and: p m , t = Σ k = 1 n | h m , t k | 2 , Wherein, n is the multipath number of choosing, and m is the subframe sequence number, and t is a descending time slot number;
Then, be p by independent variable M, tEach descending time slot at HS-DSCH place of described i+2 the subframe of function prediction on p M, tAverage p I+2, wherein, m is the subframe sequence number, t is a descending time slot number; With the subframe among Fig. 1 is example, then p i, p I+1And p I+2Represent that respectively i, i+1 and i+2 subframe descending time slot TS5 and TS6 go up p I, tAverage, herein by predicting p with said method I+2The employing following formula is represented:
p i+2＝p i+1+(p i+1-p i)
At last, by with p I+2And the p on each descending time slot at the signal interference ratio of the HS-DSCH of i+2 preceding each subframe of subframe and its place M, tAverage be the function prediction SIR_PRE of independent variable I+2, wherein, m is the subframe sequence number, t is a descending time slot number, adopts following formula herein:
SIR_PRE i+2＝SIR i+1+(10lg(p i+2)-10lg(p i+1))
At this, prediction p I+2Adopt the channel information of i and i+1 subframe.When channel circumstance changes when very fast, the channel time of the channel of i subframe and the i+2 subframe that needs prediction is bigger at interval, correlation reduces, and at this moment can only adopt the channel information of i+1 subframe and the channel information of i+2 subframe TS0 to predict p by the method for linear prediction or extrapolation I+2, can reduce like this to change channel estimating error when very fast at channel circumstance, improve systematic function;
Step 4: as 304, according to the SIR_PRE of prediction I+2Look into according to the emulation or the prefabricated SIR and the CQI table of comparisons of measured result, obtain CQI I+2, at HS-SICH iOn send to NodeB; Subsequently, as 305, UE receives HS-SCCH I+2Enter i+2 the HSDPA course of work.

Claims (8)

1, definite method of channel quality indication in a kind of high speed descending grouping access system is characterized in that, may further comprise the steps:
1.1 subscriber equipment detects the high-speed shared control channel HS-SCCH of the i+1 time high speed downlink packet access procedure i+1 subframe I+1, wherein i is a natural number;
1.2 subscriber equipment is according to HS-SCCH I+1Decoded result receive corresponding high-speed physical downlink shared channel (HS-PDSCH) HS-PDSCH I+1On information, calculate and preserve the high speed downlink shared channel HS-DSCH of i+1 subframe I+1Signal interference ratio SIR I+1
1.3 according to the signal interference ratio SIR that obtains in the step 1.2 I+1, adopt linear prediction method or, predict the high speed downlink shared channel HS-DSCH of i+2 high speed downlink packet access procedure according to the variation of channel estimating energy I+2Signal interference ratio SIR_PRE I+2
1.4 according to SIR_PRE I+2Reach signal interference ratio and the channel quality indication table of comparisons and determine the channel quality indication of the i+2 time high speed downlink packet access procedure, and send to the base station by the high-speed shared information channel of i subframe.
2, definite method of channel quality indication in the high speed descending grouping access system as claimed in claim 1 is characterized in that: in the step 1.2, if there are two or more continuous HS-DSCH I+1, then described SIR I+1Be whole HS-DSCH I+1The average of signal interference ratio.
3, definite method of channel quality indication in the high speed descending grouping access system as claimed in claim 2 is characterized in that: the SIR_PRE in the step 1.3 I+2Signal interference ratio by the high speed descending sharing channel in the i+1 time and preceding each time high speed downlink packet access procedure is that the function of independent variable obtains.
4, definite method of channel quality indication in the high speed descending grouping access system as claimed in claim 2 is characterized in that: the SIR_PRE in the step 1.3 I+2Obtain by following steps:
4.1 subscriber equipment detects the channel estimating impulse response h of the Primary Common Control Physical Channel of the descending time slot obtain preceding each subframe of i+2 subframe and i+2 subframe M, t 1, h M, t 2..., h M, t n, calculate t time slot of m subframe the channel impulse response energy and: p m , t = Σ k = 1 n | h m , t k | 2 , Wherein, n is the multipath number of choosing, and m is the subframe sequence number, and t is a descending time slot number;
4.2 by independent variable is p M, tEach descending time slot at high speed descending sharing channel place of described i+2 the subframe of function prediction on p M, tAverage p I+2, wherein, m is the subframe sequence number, t is a descending time slot number;
4.3 pass through with p I+2And the p on each descending time slot at the signal interference ratio of the high speed descending sharing channel of i+2 preceding each subframe of subframe and its place M, tAverage be the function prediction SIR_PRE of independent variable I+2, wherein, m is the subframe sequence number, t is a descending time slot number.
5, definite method of channel quality indication in the high speed descending grouping access system as claimed in claim 3, it is characterized in that: described function is linear function or endless impulse response function.
6, definite method of channel quality indication in the high speed descending grouping access system as claimed in claim 4 is characterized in that: predict p in the step 4.2 I+2Adopt linear prediction function or extrapolation function.
7, definite method of channel quality indication in the high speed descending grouping access system as claimed in claim 6 is characterized in that: when channel circumstance changes when very fast, preceding each subframe of described i+2 subframe is an i+1 subframe.
8, as definite method of channel quality indication in one of them described high speed descending grouping access system of claim 1 to 7, it is characterized in that: the described signal interference ratio and the channel quality indication table of comparisons are prefabricated according to emulation or measured result.
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CN101453307B (en) * 2007-12-03 2011-08-31 电信科学技术研究院 Data receiving status information feedback method and system under time division duplexing mode
CN101686491B (en) * 2008-09-22 2012-10-03 华为技术有限公司 Method, system and equipment for sending channel quality indicators (CQI)
CN101359983B (en) * 2008-10-08 2011-04-20 新邮通信设备有限公司 HS-SICH information bearing and encoding method
CN101626614B (en) * 2009-06-22 2011-12-07 中兴通讯股份有限公司 Method and device for controlling outer ring power of high-speed physical downlink shared channel
CN102474868B (en) * 2009-09-29 2014-07-23 上海贝尔股份有限公司 Method and equipment for estimating downlink channel condition
US8437794B2 (en) * 2010-01-28 2013-05-07 Alcatel Lucent Methods of determining uplink target signal-to-interfence-and-noise ratios and systems thereof

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CN1813413A (en) * 2003-06-26 2006-08-02 美商内数位科技公司 Method for generating a channel quality indicator by biasing signal-to-interference ratio

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