CN1394088A - Method for estimating channel quality - Google Patents
Method for estimating channel quality Download PDFInfo
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- CN1394088A CN1394088A CN 01118877 CN01118877A CN1394088A CN 1394088 A CN1394088 A CN 1394088A CN 01118877 CN01118877 CN 01118877 CN 01118877 A CN01118877 A CN 01118877A CN 1394088 A CN1394088 A CN 1394088A
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Abstract
The invention discloses the method for evaluating the channel quality. The method through the base station receives the ACK/NACK information, which is fed back by the user equipment (UE), for the received signal frame within certain time period. T. The ratio between the amount of the signal frames correctly received and the total amount of the signal frames received within the time period T is calculated. Based on the said ratio, the quality of the downward shared-channel allotted to UE is determined. The ivnented method provides the features of using less resources, high accuracy and good generality.
Description
The present invention relates to the channel estimation methods in the wireless communication system.
The high speed data transfer of mobile radio system adopts link adaptation techniques basically, and the code modulation mode that need be fit to according to the transient conditions arrangement of channel provides the throughput of system, and this just need obtain DSCH Downlink Shared Channel quality accurately.At present, obtain the DSCH Downlink Shared Channel quality and adopt two kinds of methods usually, the one, UE (subscriber equipment) or recipient measure the index that C/I (carrier/interface ratio) of Common Pilot Channel etc. can reflect channel quality, and with the measured value reporting base station, estimate DSCH Downlink Shared Channel quality or condition by the base station according to the value of reporting, select the code modulation mode of DSCH Downlink Shared Channel; The 2nd, the base station is estimated the DSCH Downlink Shared Channel condition according to UE by the dedicated channel downlink power control order that reverse link transmits, and selects the code modulation mode of DSCH Downlink Shared Channel, and does not need the channel quality measurement feedback of UE end.
For above-mentioned first method, UE will measure the result that Common Pilot Channel obtains and report, and the uplink bandwidth that takies is relevant with its report cycle.The base station is for judging up-to-date channel condition, and is inevitable continually with the measurement result reporting base station, but that the upstream bandwidth that takies also can become thereupon is big; If report frequency little, though the upstream bandwidth that takies can diminish, it is big that report cycle becomes, and the base station is difficult for obtaining objectively nearest channel condition.Secondly, what UE measured is the Common Pilot Channel signal of theaomni-directional transmission, and this signal quality can not be equal to the DSCH Downlink Shared Channel signal quality by narrow beams transmission, therefore is difficult to accurately provide the measurement result of base station needs.
For above-mentioned second method, because the dedicated channel of same UE and DSCH Downlink Shared Channel transmit in a wave beam, the downlink power control order of dedicated channel can reflect that the channel quality of DSCH Downlink Shared Channel and feedback delay are little.But this method is suitable for the situation that DPCH is in non-soft handover, is in the situation of soft handover for DPCH, and the downlink power control order of dedicated channel is not necessarily mated with the DSCH Downlink Shared Channel condition.
The object of the present invention is to provide a kind of channel quality estimation method that resource is few, accuracy is high, versatility is good that takies.
For achieving the above object, the invention provides a kind of channel quality estimation method, comprising:
The base station receives ACK/NACK (affirmation/non-affirmation) information of its received signal frame in time range T of UE (subscriber equipment) feedback, utilizes this information to judge the quality of the DSCH Downlink Shared Channel of distributing to this UE, arranges suitable code modulation mode.
Described method also comprises the step of determining time range T, and a kind of method is to determine described time range T, for from than the Zao set time length of current time the time be carved into a period of time between the current time.
Above-mentioned time range T also can adopt another method setting: determine described time range T, start from the base station sends the previous bag of packet to the user first biography and received by UE that the last re-transmission that ends at this previous bag is received by UE.
The correct ACK/NACK information that receives of the described interior UE of scope T computing time is utilized the signal frame number of the correct reception of UE in this time range of this information calculations T and the ratio of the signal frame number that receives altogether, judges channel quality.
Described according to the ratio of the correct signal frame number that receives of UE in the time range T with the signal frame number that receives altogether, judge the quality of the DSCH Downlink Shared Channel of distributing to this UE, arrange suitable code modulation mode.
Because the ACK/NACK information that is included in the frame to received signal in the upward signal that the present invention utilizes UE to send is judged the DSCH Downlink Shared Channel quality, not other occupied bandwidth reporting channel quality information, reduce upstream bandwidth, saved resource, in addition, because ACK/NACK information is the UE true reflection of frame quality to the received signal, so the present invention utilizes this information can draw the channel quality of DSCH Downlink Shared Channel accurately.Because the present invention has utilized the information of ACK/NACK, no matter make that whether DPCH carries out soft handover, can both reflect the channel quality of DSCH Downlink Shared Channel.Simultaneously, because the present invention combines the service quality of specific transactions to a certain extent, the ratio of the signal frame number that good frame number that calculating UE receives at certain time intervals and UE receive altogether, reflected should be in the time interval frame error rate, can auxiliary judgment whether satisfy professional service quality.
The present invention is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is the flow chart of the embodiment of the invention;
Fig. 2 is a principle schematic of the present invention.
Owing in the wireless high-speed data transmission course, need to adopt link adaptation techniques, therefore require system that the quality of DSCH Downlink Shared Channel is estimated.Yet, consider from whole system, estimate that the DSCH Downlink Shared Channel quality needs the least possible system link resource that takies, but also will guarantee the correctness of channel estimating.If can utilize the existing information of system to carry out channel estimating, can solve above-mentioned task preferably.
In fact, in the wireless high-speed data transmission course, if judge that the reception data are wrong, UE can send data transmission fault to the base station, and the request of transfer of data is carried out in requirement again, simultaneously, the variation of the code modulation mode of data with the adaptive channel quality also can be adjusted according to quality of channel in the base station.Usually in the wireless high-speed data transmission, AMC (adaptive coding and modulating) uses with HARQ (mixing automatic repeat requests), but the two is independent, and AMC does not utilize the feedback information of HARQ to come estimated channel quality.For this reason, the present invention proposes a kind of new DSCH Downlink Shared Channel quality estimation method, and this method has effectively been utilized the supplementary of HARQ when estimated channel quality, can estimate the DSCH Downlink Shared Channel quality more accurately, simultaneously, reduce the UE feedback information, reduce the upstream channel bandwidth that takies.
In the wireless high-speed data transmission system, DSCH Downlink Shared Channel has used SAW (stopping etc.) HARQ agreement, and UE whenever receives a frame, by up channel feeding back ACK/NACK confirmation, the base station receives the ACK/NACK information of UE, knows whether UE correctly receives this frame signal.If UE feeding back ACK information illustrates that the Frame that receives is correct, the base station sends the next frame signal; If UE feedback nack message or feeding back ACK information not illustrate that the reception of Frame is incorrect, this frame signal need be retransmitted in the base station.So ACK/NACK information can reflect the quality height of present frame, therefore can be used to indicate the DSCH Downlink Shared Channel quality.
More particularly, in the wireless high-speed data transmission system, the base station receives ACK/NACK (affirmation/non-affirmation) information of the frame to received signal of each the frame feedback of UE (subscriber equipment) in time of reception scope T, calculate the signal frame number of the correct reception of UE in this time range T and the ratio of the signal frame number that receives altogether, distribute to the quality of the DSCH Downlink Shared Channel of this UE according to this ratio in judgement, correctly to arrange code modulation mode.Utilize described ratio, judge the quality of the DSCH Downlink Shared Channel of distributing to this UE, arrange suitable code modulation mode according to UE in the time range T signal frame number that correctly receives and the signal frame number that receives altogether.
The step that also should comprise according to the method described above, a definite time range T.Determine described time range T, a kind of method be set T for from than the Zao set time length of current time the time be carved into a period of time between the current time.Another kind method is to set T to start from the base station sends the previous packet of packet to the user first biography and received by UE, and the last re-transmission that ends at this previous packet is received by UE.That is to say that the time range of base station statistics ACK/NACK can be fixed also can be variable.Under the previous case, the base station is constantly added up than the ACK/NACK information in the time interval of the Zao T length of current time, utilize correct received frame number of this information calculations UE in this time range and frames received purpose ratio altogether, estimate to distribute to the quality of the DSCH Downlink Shared Channel of this UE.Under the latter event, the ACK/NACK information of previous bag from the initial transmission packet to the retransmission packet of current bag is added up, estimated channel quality in the base station in issuing the user's data bag.
Fig. 2 is a principle schematic of the present invention, therefrom as can be seen the ACK/NACK of UE feedback and estimate by the DSCH Downlink Shared Channel quality that ACK/NACK obtains between a kind of possible relation.Certainly, in real system, statistics, the time interval of calculating ACK/NACK, the length of a frame, timeslot number that ACK/NACK information is shared or the like parameter not necessarily can with schematic diagram represent consistent.
Among Fig. 2, each frame comprises 5 time slots, determined time range T, be time than the Zao T length of current time, constantly add up UE in each time T in the base station of UTRAN side and utilize the ACK/NACK information of the frame to received signal of each frame feedback, be used for obtaining corresponding D LQ (down channel quality estimation).Shown in the figure, DLQ is that the base station gets based on the ACK/NACK information accumulative total that receives, the estimation of DSCH Downlink Shared Channel quality is determined by DLQ, after the estimation of having determined the DSCH Downlink Shared Channel quality, base station selected suitable MCS (coded modulation scheme) carries out the transmission of data, and UE receives data by DSCH Downlink Shared Channel.
Fig. 1 is the flow chart of a specific embodiment of the present invention, in step 1, determines base station time of reception scope T, for from than the Zao set time length T of current time the time be carved into a period of time between the current time; In step 2, the initial value that time counter is set is zero, and the base station receives the ACK/NACK information in the current time T then; After receiving ACK/NACK information, whether the value of execution in step 3 judgement time counter t surpasses the time T of statistics ACK/NACK information; If judged result is not for surpassing, then execution in step 7, carry out 1 operation that adds of time counter t, turn back to described step 3 then, continue to receive ACK/NACK information, if judged result is for surpassing, then base station execution in step 5 and step 6, the ACK/NACK information that statistics receives, estimated channel quality, the coded modulation scheme of selection current wireless frame, simultaneously, the ACK/NACK statistics in the next time T is continued with time counter t zero clearing in the base station.
Have as can be seen above-mentionedly, the base station needs the correct received frame number of UE adding up, calculate and frames received purpose ratio altogether, reflects the frame error rate in this time T, can auxiliary judgment whether satisfy quality of service.Modulation coding mode is adjusted according to the frame error rate that reflects in the base station.From this angle, the principle of utilizing external circule power control that the present invention is similar to.It is emphasized that the present invention is used among the specific shared channel of data service, by base station statistics frame error rate but directly do not regulate transmitting power, but adaptive change code modulation mode, so that configuration more reliably to be provided.
Claims (4)
1, a kind of channel quality estimation method comprises:
The base station receives ACK/NACK (affirmation/non-affirmation) information of its received signal frame in time range T of UE (subscriber equipment) feedback, utilizes this information to judge the quality of the DSCH Downlink Shared Channel of distributing to this UE.
2, channel quality estimation method according to claim 1, it is characterized in that: this method also comprises the step of determining time range T, determine described time range T, for UE end from than the Zao set time length of current time the time be carved into a period of time between the current time.
3, channel quality estimation method according to claim 1, it is characterized in that: this method also comprises the step of determining time range T, determine described time range T, starting from the base station sends the previous bag of current data packet to the user first biography is received by UE, the last re-transmission that ends at this bag is received by UE, is the time of the previous packet that the UE termination receives.
4, channel quality estimation method according to claim 1, it is characterized in that: the ACK/NACK information of utilizing described reception, calculate the signal frame number of the correct reception of UE in this time range T and the ratio of the signal frame number that receives altogether,, judge channel quality by this ratio.
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| CNB011188774A CN1148080C (en) | 2001-06-28 | 2001-06-28 | Method for estimating channel quality |
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| CNB011188774A CN1148080C (en) | 2001-06-28 | 2001-06-28 | Method for estimating channel quality |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100411317C (en) * | 2003-07-08 | 2008-08-13 | 联想(北京)有限公司 | A method for improving transmission efficiency of wireless network channel |
| CN101433007A (en) * | 2006-03-20 | 2009-05-13 | 诺基亚公司 | Channel quality signaling |
| CN101494516B (en) * | 2008-01-22 | 2011-10-26 | 中兴通讯股份有限公司 | Method and apparatus for self-adapting feedback of down channel quality |
| US8086270B2 (en) | 2004-09-06 | 2011-12-27 | Panasonic Corporation | Classifying-synthesizing transmission method of multi-user feedback information at base station |
| CN102781104A (en) * | 2007-03-01 | 2012-11-14 | 株式会社Ntt都科摩 | Base station device and communication control method |
| CN101374004B (en) * | 2007-08-23 | 2013-02-27 | 中兴通讯股份有限公司 | Method for compressing upstream channel quality indication information |
| CN103701572A (en) * | 2012-09-27 | 2014-04-02 | 普天信息技术研究院有限公司 | Method and device for indicating quality of channel |
| CN101529774B (en) * | 2006-10-31 | 2014-07-09 | 高通股份有限公司 | Method and apparatus for reducing overhead based on the ack channel |
| CN104283621A (en) * | 2013-07-12 | 2015-01-14 | 普天信息技术研究院有限公司 | Channel transmission quality monitoring method |
| CN116112124A (en) * | 2023-03-23 | 2023-05-12 | 深圳国人无线通信有限公司 | Method and device for configuring uplink shared channel in adaptive adjustment coding |
-
2001
- 2001-06-28 CN CNB011188774A patent/CN1148080C/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100411317C (en) * | 2003-07-08 | 2008-08-13 | 联想(北京)有限公司 | A method for improving transmission efficiency of wireless network channel |
| US8086270B2 (en) | 2004-09-06 | 2011-12-27 | Panasonic Corporation | Classifying-synthesizing transmission method of multi-user feedback information at base station |
| CN101433007A (en) * | 2006-03-20 | 2009-05-13 | 诺基亚公司 | Channel quality signaling |
| CN101433007B (en) * | 2006-03-20 | 2012-09-12 | 诺基亚公司 | Channel quality signaling |
| CN101529774B (en) * | 2006-10-31 | 2014-07-09 | 高通股份有限公司 | Method and apparatus for reducing overhead based on the ack channel |
| CN102781104A (en) * | 2007-03-01 | 2012-11-14 | 株式会社Ntt都科摩 | Base station device and communication control method |
| CN101374004B (en) * | 2007-08-23 | 2013-02-27 | 中兴通讯股份有限公司 | Method for compressing upstream channel quality indication information |
| CN101494516B (en) * | 2008-01-22 | 2011-10-26 | 中兴通讯股份有限公司 | Method and apparatus for self-adapting feedback of down channel quality |
| CN103701572A (en) * | 2012-09-27 | 2014-04-02 | 普天信息技术研究院有限公司 | Method and device for indicating quality of channel |
| CN104283621A (en) * | 2013-07-12 | 2015-01-14 | 普天信息技术研究院有限公司 | Channel transmission quality monitoring method |
| CN116112124A (en) * | 2023-03-23 | 2023-05-12 | 深圳国人无线通信有限公司 | Method and device for configuring uplink shared channel in adaptive adjustment coding |
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| Publication number | Publication date |
|---|---|
| CN1148080C (en) | 2004-04-28 |
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