CN105610543A - Method and device for adjusting channel quality indicator (CQI) - Google Patents
Method and device for adjusting channel quality indicator (CQI) Download PDFInfo
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- CN105610543A CN105610543A CN201410692435.7A CN201410692435A CN105610543A CN 105610543 A CN105610543 A CN 105610543A CN 201410692435 A CN201410692435 A CN 201410692435A CN 105610543 A CN105610543 A CN 105610543A
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- retransmission rate
- cqi
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Abstract
The invention discloses a method and a device for adjusting a channel quality indicator (CQI), which relate to the field of communication. The method comprises the following steps: when the signal-to-interference ratio (SIR) of an uplink channel is lower than a preset threshold, data of a medium access control (MAC) layer are transmitted to a radio link control (RLC) layer; the retransmission rate of the RLC layer is calculated, and the CQI is adjusted according to the calculated retransmission rate and a preset retransmission rate threshold. The invention also discloses a device for adjusting the CQI. Thus, the problem of HSDPA (High Speed Downlink Packet Access) channel quality caused by an unreliable uplink physical channel HS-DPCCH (High-Speed Dedicated Physical Control Channel) can be effectively avoided, the normal channel throughput is ensured, and the user experience is enhanced.
Description
Technical field
The present invention relates to the communications field, be specifically related to a kind of method and apparatus of adjusting channel quality indicator (CQI) (Channelqualityindicator, channel quality instruction) in communication system
Background technology
Uplink downlink covers imbalance and refers generally in target coverage region, and the situation that up covering is limited or descending covering is limited appears in business. The situation that up covering is limited, can think that in theory terminal (UE) maximum transmission power still can not reach the receiving sensitivity requirement of base station (NodeB), for example cell edge, up-link (UL) gain of the Intermodulation Interference that station equipment produces altogether and signals leakiness, repeater arranges improper for base station uplink receiving total bandwidth power (RTWP) generation interference, having raised the end makes an uproar, increased up coupling loss, now the throughput of UE will be very low.
In the uneven scene of up-downgoing, because uplink signal-channel quality is poor, the CQI information that UE uploads just becomes unreliable. NodeB does outer shroud adjustment and selects piece under wrong CQI, and throughput just cannot ensure. At uplink downlink imbalance, HS-DPCCH (High-SpeedDedicatedPhysicalControlChannel, the exclusive entity control channel of up-high speed) in the very poor situation of channel quality, the CQI information that UE feeds back to NodeB is unreliable, now also carry out descending HSDPA (HighSpeedDownlinkPacketAccess by UE feedback information, high speed downlink packet access) scheduling, it is inevitable very poor that user experiences.
Summary of the invention
The invention provides a kind of method and apparatus of adjusting channel quality indicator (CQI), can effectively avoid the HSDPA channel quality problem causing because uplink physical channel HS-DPCCH is unreliable.
First aspect the invention provides a kind of method of adjusting channel quality indicator (CQI).
First, the signal-to-noise ratio SIR of up channel during lower than pre-set threshold value, passes to wireless chain control layer rlc layer by media access control layer MAC layer data.
Preferably, in the time that described pre-set threshold value is negative value, media access control layer MAC layer data is passed to wireless chain control layer rlc layer.
Preferably, when described pre-set threshold value is-8db, media access control layer MAC layer data is passed to wireless chain control layer rlc layer.
Secondly, calculate the retransmission rate of rlc layer, adjust CQI according to the retransmission rate calculating and default retransmission rate threshold value.
Preferably, in the time that the retransmission rate of rlc layer is greater than described default retransmission rate threshold value, reduce CQI, reduce
Select piece; In the time that the retransmission rate of rlc layer is less than described default retransmission rate threshold value, promote CQI, increase choosing
Piece; In the time that the retransmission rate of rlc layer equals described default retransmission rate threshold value, CQI does not adjust.
Preferably, setting in advance rlc layer retransmission rate is 0～5%.
Second aspect the present invention also provides the device that promotes HSDPA performance, comprising:
Judge module, comprises the first judge module and the second judge module, and wherein, the first judge module, for during lower than pre-set threshold value, triggering sending module at down channel SIR; The second judge module enters adjusting module sending module after judging the relation of rlc layer retransmission rate and default retransmission rate threshold values, and MAC layer data is passed to rlc layer;
Preferably, be in negative value situation at the SIR of HS-DPCCH channel, media access control layer MAC layer data is passed to wireless chain control layer rlc layer.
Sending module, for passing to wireless chain control layer rlc layer by media access control layer MAC layer data;
Adjusting module, for adjusting CQI according to the retransmission rate calculating and default retransmission rate threshold value; : when rlc layer retransmission rate is during higher than default retransmission rate threshold value, lower CQI, reduce and select piece; Rlc layer retransmission rate, lower than default retransmission rate threshold value, raises CQI, increases and selects piece; In the time that the retransmission rate of rlc layer equals described default retransmission rate threshold value, CQI does not adjust.
Preferably, setting in advance rlc layer retransmission rate is 0～5%.
Can effectively avoid the HSDPA channel quality problem causing because up uplink physical channel HS-DPCCH is unreliable by solution provided by the invention, ensure the normal handling capacity of channel, increase user experience.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention or present technology, will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below.
Fig. 1 illustrates the up-downgoing physical channel using between NodeB of the present invention and UE;
Fig. 2 is the schematic diagram of a kind of method and apparatus of adjusting channel quality indicator (CQI) of the present invention;
Fig. 3 is the method implementing procedure figure of the embodiment of the present invention;
Fig. 4 is a kind of installation drawing of adjusting channel quality indicator (CQI) of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing to a preferred embodiment of the present invention will be described in detail. Should be appreciated that following illustrated preferred embodiment, only for description and interpretation the present invention, is not intended to limit the present invention.
Up-downgoing physical channel between NodeB and UE as shown in Figure 1, UE is by up HS-DPCCH channel cycle ground to NodeB reported data, and NodeB sends to UE indication information by descending HS-SCCH. UE, after each packet data package receives, sends ACK/NACK confirmation by up HS-DPCCH channel to NodeB.
A kind of method and apparatus schematic diagram of adjusting channel quality indicator (CQI) of Fig. 2 the present invention. The signal-to-noise ratio SIR of HS-DPCCH channel during lower than pre-set threshold value, directly passes to rlc layer by MAC layer data; Described pre-set threshold value negative value is negative value. Calculate the retransmission rate of rlc layer, and adjust CQI according to default retransmission rate; When the retransmission rate of rlc layer is greater than described default retransmission rate threshold values, reduce CQI by external circule power control; When the retransmission rate of rlc layer is during lower than described default retransmission rate, promote CQI; In the time that the retransmission rate of rlc layer equals described default retransmission rate threshold values, CQI does not adjust.
The method implementing procedure figure of Fig. 3 embodiment of the present invention. As shown in Figure 3, comprise the following steps:
Step S301:SIR can be used for characterizing HS-DPCCH channel signal quality level, and when up SIR thinks that quality of uplink signal is poor during lower than pre-set threshold value, the CQI information of UE feedback is unreliable, carries out HSDPA scheduling according to method of the present invention. The data of the transmission of asking for UE, adopt initial CQI15 to select piece.
CQI selects block method to be described as follows:
Selecting piece according to CQI is to carry out according to the CQITable in 3GPP agreement TS25.214. Such as UE is the data card that Category14 supports 64QAM, CQI15 will select 3328. according to CQITableG in the not limited situation of code channel
Table 1:CQImappingtable (channel quality instruction proportioning table)
Step S302: in the time that up SIR is greater than pre-set threshold value, think that quality of uplink signal can accept, HSDPA scheduler uses CQI, ACK, the nack message of HS-DPCCH channel feedback to dispatch data, and concrete mode is with reference to 3GPP agreement TS25.214.
The data of step S303:S302 scheduling are directly dealt into rlc layer at MAC-HS layer, calculate retransmission rate at rlc layer, and rlc layer retransmission rate=rlc layer retransmits PDU bag number/rlc layer and receives total data bag number.
Step S304: the rlc layer retransmission rate of calculating according to S304, the target that RLC retransmission rate threshold values is set is 0～5%, in the time that RLC retransmission rate is greater than default retransmission rate threshold values, just enters S306, otherwise enters S305.
Step S305: on S304 basis, if RLC retransmission rate is lower than default retransmission rate threshold values, think that signal quality is better, can improve CQI, allow the larger data block of scheduler choosing carry out data transmission; When RLC retransmission rate equals default retransmission rate threshold values, CQI does not adjust.
Step S306: on S304 basis, when RLC retransmission rate is greater than default retransmission rate threshold values, reduce CQI by external circule power control, reduce and select piece, guarantee correctly demodulation of data. The data that MAC-HS layer is all treated as new biography for ACK, NACK, do not retransmit.
Step S307; When RLC retransmission rate equals default retransmission rate threshold values, CQI does not adjust.
Fig. 4 provides the device flow chart of the uneven up limited antagonism of UMTS system up-downgoing. Comprise as shown in Figure 4:
Judge module, comprises the first judge module and the second judge module, and wherein, the first judge module, for during lower than pre-set threshold value, triggering sending module at down channel SIR; The second judge module enters adjusting module sending module after judging the relation of rlc layer retransmission rate and default retransmission rate threshold values, and MAC layer data is passed to rlc layer;
Preferably, be in negative value situation at the SIR of HS-DPCCH channel, media access control layer MAC layer data is passed to wireless chain control layer rlc layer.
Sending module, for passing to wireless chain control layer rlc layer by media access control layer MAC layer data;
Adjusting module, for adjusting CQI according to the retransmission rate calculating and default retransmission rate threshold value; : when rlc layer retransmission rate is during higher than default retransmission rate threshold value, lower CQI, reduce and select piece; Rlc layer retransmission rate, lower than default retransmission rate threshold value, raises CQI, increases and selects piece; In the time that the retransmission rate of rlc layer equals described default retransmission rate threshold value, CQI does not adjust.
Preferably, setting in advance rlc layer retransmission rate is 0～5%.
Above-mentioned explanation illustrates and has described a preferred embodiment of the present invention, but as previously mentioned, be to be understood that the present invention is not limited to disclosed form herein, should not regard the eliminating to other embodiment as, and can be used for various other combinations, amendment and environment, and can, in invention contemplated scope described herein, change by technology or the knowledge of above-mentioned instruction or association area. And the change that those skilled in the art carry out and variation do not depart from the spirit and scope of the present invention, all should be in the protection domain of claims of the present invention.
Claims (8)
1. a method of adjusting channel quality indicator (CQI), is characterized in that, comprising:
The signal-to-noise ratio SIR of up channel is during lower than pre-set threshold value, by the media access control layer MAC number of pliesReportedly give wireless chain control layer rlc layer;
Calculate the retransmission rate of rlc layer, adjust CQI according to the retransmission rate calculating and default retransmission rate threshold value.
2. the method for claim 1, is characterized in that, the retransmission rate of described calculating rlc layer,Specifically comprise according to the retransmission rate calculating and default retransmission rate threshold value adjustment CQI: when the retransmission rate of rlc layerWhile being greater than described default retransmission rate threshold value, reduce CQI, reduce and select piece; When the retransmission rate of rlc layer is less than instituteWhile stating default retransmission rate threshold value, promote CQI, increase and select piece; When the retransmission rate of rlc layer equals described defaultWhen retransmission rate threshold value, CQI does not adjust.
3. the method for claim 1, is characterized in that, described pre-set threshold value is negative value.
4. the method for claim 1, is characterized in that, the getting of described default retransmission rate threshold valueValue scope is 0～5%.
5. a device of adjusting CQI, is characterized in that, comprises;
Judge module, comprises the first judge module and the second judge module, and wherein, the first judge module, usesDuring lower than pre-set threshold value, triggering sending module at down channel SIR; The second judge module, for judgementAfter the relation of rlc layer retransmission rate and default retransmission rate threshold values, enter adjusting module;
Sending module, for passing to wireless chain control layer rlc layer by media access control layer MAC layer data;
Adjusting module, for adjusting CQI according to the retransmission rate calculating and default retransmission rate threshold value.
6. the device as shown in claim 5, is characterized in that, described adjusting module, according to calculatingThe retransmission rate going out and default retransmission rate threshold value are adjusted CQI and are specifically comprised: when rlc layer retransmission rate is higher than default heavyWhen biography rate threshold value, lower CQI, reduce and select piece; Rlc layer retransmission rate, lower than default retransmission rate threshold value, raisesCQI, increases and selects piece; In the time that the retransmission rate of rlc layer equals described default retransmission rate threshold value, CQI does not adjust.
7. device as claimed in claim 5, is characterized in that, described pre-set threshold value is negative value.
8. device as claimed in claim 5, is characterized in that, the getting of described default retransmission rate threshold valuesValue scope is 0～5%.
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| CN201410692435.7A CN105610543A (en) | 2014-11-25 | 2014-11-25 | Method and device for adjusting channel quality indicator (CQI) |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019041168A1 (en) * | 2017-08-30 | 2019-03-07 | Qualcomm Incorporated | Enhancement for low latency service |
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| JP2005064947A (en) * | 2003-08-14 | 2005-03-10 | Matsushita Electric Ind Co Ltd | Radio communication apparatus and reception quality reporting method |
| CN101207465A (en) * | 2007-12-14 | 2008-06-25 | 华为技术有限公司 | Method, apparatus and system for adjusting signal channel quality indication |
| CN102065534A (en) * | 2011-01-31 | 2011-05-18 | 华为技术有限公司 | Power adjustment method and device |
| CN102685905A (en) * | 2007-01-09 | 2012-09-19 | 株式会社Ntt都科摩 | Base station device |
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2014
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005064947A (en) * | 2003-08-14 | 2005-03-10 | Matsushita Electric Ind Co Ltd | Radio communication apparatus and reception quality reporting method |
| CN102685905A (en) * | 2007-01-09 | 2012-09-19 | 株式会社Ntt都科摩 | Base station device |
| CN101207465A (en) * | 2007-12-14 | 2008-06-25 | 华为技术有限公司 | Method, apparatus and system for adjusting signal channel quality indication |
| CN102065534A (en) * | 2011-01-31 | 2011-05-18 | 华为技术有限公司 | Power adjustment method and device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019041168A1 (en) * | 2017-08-30 | 2019-03-07 | Qualcomm Incorporated | Enhancement for low latency service |
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Application publication date: 20160525 |