CN102752867A - Method for achieving link adaptation, terminal device and network device - Google Patents

Method for achieving link adaptation, terminal device and network device Download PDF

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Publication number
CN102752867A
CN102752867A CN2012100572529A CN201210057252A CN102752867A CN 102752867 A CN102752867 A CN 102752867A CN 2012100572529 A CN2012100572529 A CN 2012100572529A CN 201210057252 A CN201210057252 A CN 201210057252A CN 102752867 A CN102752867 A CN 102752867A
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Prior art keywords
resource
modulation coding
coding mode
channel quality
cqi information
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Inventor
姚惠娟
王竞
刘慎发
潘立军
王加庆
于晓燕
闫志刚
鲍东山
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Beijing Nufront Mobile Multimedia Technology Co Ltd
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Beijing Nufront Wireless Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0019—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H04L1/003—Adaptive formatting arrangements particular to signalling, e.g. variable amount of bits

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Probability & Statistics with Applications (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a method for achieving link adaptation. The method comprises that a terminal device detects channel quality and compares the channel quality with a threshold value, and the terminal device reports channel quality information (CQI) when the channel quality exceeds the threshold value; and a network device receives the CQI and selects proper transfer modes for downlink data transfer according to the CQI. By the aid of the method and devices, the utilization ratio of frequency spectrums and the system performance are improved.

Description

A kind of method, terminal equipment and network equipment that is used to realize link circuit self-adapting
It is on March 31st, 2011 that the application requires the applying date; Application number is 201110081285.2; Denomination of invention is the priority in first to file of " a kind of method and system of realizing link circuit self-adapting based on channel quality indication feedback ", should all embody in this application at the full content of first to file.
It is on May 19th, 2011 that the application requires the applying date, and application number is 201110130194.3, and denomination of invention is the priority in first to file of " a kind of communication system ", should all embody in this application at the full content of first to file.
It is on July 6th, 2011 that the application requires the applying date; Application number is 201110188947.6; Denomination of invention is the priority in first to file of " a kind of communication means, wireless communication system and equipment of realizing multiple-input and multiple-output ", should all embody in this application at the full content of first to file.
It is on July 7th, 2011 that the application requires the applying date; Application number is 201110188814.9; Denomination of invention is the priority in first to file of " a kind of method, system and equipment of realizing link circuit self-adapting based on channel quality indication feedback ", should all embody in this application at the full content of first to file.
It is on February 10th, 2012 that the application requires the applying date; Application number is 201210029880.6; Denomination of invention is the priority in first to file of " a kind of method and apparatus that is used to realize link circuit self-adapting ", should all embody in this application at the full content of first to file.
Technical field
The invention belongs to wireless communication field, relate in particular to a kind of method, terminal equipment and network equipment that is used to realize link circuit self-adapting.
Background technology
Along with the fast development of wireless communication technology, the wretched insufficiency of frequency spectrum resource has become " bottleneck " of radio communication career development day by day.For wireless communication system, the most valuable is exactly frequency spectrum resource, therefore how fully to develop limited frequency spectrum resources, and the service efficiency that improves frequency spectrum is crucial.
The performance (for example throughput) that becomes fading channel when actual radio communication channel is is constantly to change, and traditional design adopts fixing message transmission parameter like chnnel coding modulation system and transmitting power, the channel that becomes when obviously this can not adapt to.Therefore link adaptation techniques has been proposed; So-called link adaptation techniques is meant in wireless communication system according to the variation of wireless channel environment and dynamic adjustment transmits and receives the parameter of machine; Like transmitting power, modulation system, code rate, number of retransmissions and data frame length or the like, make radio channel resource be utilized.
Channel quality information (CQI; Channel Quality Information) indicated in the downlink or uplink direction; Guarantee under the rational block error rate channel quality information of the number of the size that can correctly accept transmission block of estimation, modulation system, parallel sign indicating number etc.The current wireless reception environment is measured at the terminal; Estimate the current maximum CQI value that allows; Suitable downlink or uplink Channel Transmission form is selected according to the CQI suggestion at terminal in the base station; Comprise size, the modulation system of transmission block, the walk abreast number of sign indicating number, the capability correction value of reference etc., carry out the link circuit self-adapting adjustment.
Along with the fast development of wireless communication technology, have higher requirement to being used to realize the method for link adaptation mechanism.
Summary of the invention
In view of this, technical problem to be solved by this invention provides a kind of new method that is used to realize link circuit self-adapting, for there is a basic understanding some aspects to the embodiment that discloses, has provided simple summary below.This summary part is not to comment general, neither confirm the key/critical component or describe the protection range of these embodiment.Its sole purpose is to present some notions with simple form, with this preamble as the detailed description of back.
In order to solve the problems of the technologies described above, the present invention also provides a kind of method based on channel quality indication feedback realization link circuit self-adapting, comprises the steps:
Terminal equipment detects channel quality, if in case above threshold value, terminal equipment can initiatively send CQI information to the network equipment;
The network equipment receives after the CQI information of each terminal equipment feedback, in conjunction with upper-layer service information, and according to the CQI information of being fed back, in the descending scheduling of follow-up terminal equipment, confirms its transmission parameter, sends data to corresponding terminal device.
The resource acquisition of feedback can comprise following three kinds of modes:
The CQI feedback information directly is in the same place with data aggregate, utilizes the upstream data resource of having distributed to transmit; Or
Terminal equipment carries the resource request that a CQI reports in uplink data frames, network equipment Resources allocation then, and terminal equipment sends CQI information to the network equipment again;
Terminal equipment sends the uplink scheduling request code, sends the uplink scheduling request, is the resource allocation of CQI feedback request.
Active feedback is based on that channel estimating or the descending sounding channel of the physical layer transmission unit (PPDU) of nearest reception calculate.
The CQI information of terminal equipment feedback constitutes the channel-quality feedback frame in the encapsulation of mac frame layer, comprises mac frame head, frame and FCS, and wherein the frame partial information can be indicated according to feedback kind, feeds back the CQI information of each bandwidth of operation.
The CQI information of the subchannel of said each bandwidth of operation comprises: MCS, Nss, type of coding and SN R or SINR.
The CQI information of the subchannel of said each bandwidth of operation comprises: MCS, type of coding and SNR or SINR.
In order to solve the problems of the technologies described above, the present invention also provides a kind of wireless communication system that can realize link circuit self-adapting based on channel quality indication feedback, comprising:
Terminal equipment is used to detect channel quality, if in case above threshold value, can initiatively send CQI information to the network equipment;
The network equipment is used to receive after the CQI information of each terminal equipment feedback, in conjunction with upper-layer service information, and according to the CQI information of being fed back, in the descending scheduling of follow-up terminal equipment, confirms its transmission parameter, sends data to corresponding terminal device.
In order to solve the problems of the technologies described above, the invention provides a kind of method that is used to realize link circuit self-adapting, comprising:
Terminal equipment detects channel quality, and said channel quality and threshold value are compared, reporting channel quality information CQI information when said channel quality surpasses said threshold value;
The network equipment receives said CQI information, and is that downlink data transmission is selected suitable transmission mode according to said CQI information.
In some optional embodiment, said terminal equipment utilizes the transmitting uplink data resource, reports said CQI information.
In some optional embodiment, said CQI information comprises one or more in the following information:
Modulation coding mode MCS is used to identify the modulation coding mode of the frequency band of asking;
Type of coding is used to identify the coded system that STA recommends;
Signal to noise ratio snr is used to identify the average signal-to-noise ratio on institute's bandwidth on demand and the spatial flow; With,
Subchannel mapping is used for the Sub-Channel Number of the bandwidth and the concrete correspondence of identification feedback subchannel.
In some optional embodiment, said CQI information comprises one or more in the following information:
Modulation coding mode MCS is used to identify the modulation coding mode of the frequency band of asking;
Type of coding is used to identify the coded system that STA recommends;
Signal to Interference plus Noise Ratio SINR is used to identify the average Signal to Interference plus Noise Ratio on institute's bandwidth on demand and the spatial flow; With,
Subchannel mapping is used for the Sub-Channel Number of the bandwidth and the concrete correspondence of identification feedback subchannel.
In some optional embodiment, said modulation coding mode is divided into first modulation coding mode and second modulation coding mode.
In order to solve the problems of the technologies described above, the present invention also provides a kind of method that is used to realize link circuit self-adapting, comprising:
Terminal equipment detects channel quality, and said channel quality and threshold value is compared requests resource allocation when said channel quality surpasses said threshold value;
The network equipment sends the resource indication;
Said terminal equipment utilizes the indicated resource reporting channel quality information CQI information of said resource indication;
The said network equipment receives said CQI information, and is that downlink data transmission is selected suitable transmission mode according to said CQI information.
In some optional embodiment, said terminal equipment carries resource request when sending uplink data frames, with requests resource allocation.
In some optional embodiment, said resource request is sent through the mode that is carried at the independent resource claim frame, or, through incidentally sending in the mode of uplink data frames with road resource request form.
In some optional embodiment, said terminal equipment sends dispatch request, with requests resource allocation.
In some optional embodiment, said terminal equipment sends the dispatch request sequence earlier, and the resource request of redispatching is with requests resource allocation.
In some optional embodiment, said resource request is sent through the mode that is carried at the independent resource claim frame.
In some optional embodiment, the indication of said resource specifically comprises one or more in the following information: symbol offset, duration, subchannel mapping and CQI transmission mode; Wherein,
Said CQI transmission mode comprises modulation coding mode MCS and spatial flow number indication Nss.
In some optional embodiment, said CQI information comprises one or more in the following information:
Modulation coding mode MCS is used to identify the modulation coding mode of the frequency band of asking;
Type of coding is used to identify the coded system that STA recommends;
Signal to noise ratio snr is used to identify the average signal-to-noise ratio on institute's bandwidth on demand and the spatial flow; With,
Subchannel mapping is used for the Sub-Channel Number of the bandwidth and the concrete correspondence of identification feedback subchannel.
In some optional embodiment, said CQI information comprises one or more in the following information:
Modulation coding mode MCS is used to identify the modulation coding mode of the frequency band of asking;
Type of coding is used to identify the coded system that STA recommends;
Signal to Interference plus Noise Ratio SINR is used to identify the average Signal to Interference plus Noise Ratio on institute's bandwidth on demand and the spatial flow; With,
Subchannel mapping is used for the Sub-Channel Number of the bandwidth and the concrete correspondence of identification feedback subchannel.
In some optional embodiment, said modulation coding mode is divided into first modulation coding mode and second modulation coding mode.
In order to solve the problems of the technologies described above, the present invention also provides a kind of terminal equipment, comprising:
Detecting unit is used to detect channel quality;
Comparing unit is used for said channel quality and threshold value are compared; With,
Report the unit, be used for reporting channel quality information CQI information when said channel quality surpasses said threshold value.
In some optional embodiment, the said unit by using transmitting uplink data resource that reports reports said CQI information.
In some optional embodiment, said CQI information comprises one or more in the following information:
Modulation coding mode MCS is used to identify the modulation coding mode of the frequency band of asking;
Type of coding is used to identify the coded system that STA recommends;
Signal to noise ratio snr is used to identify the average signal-to-noise ratio on institute's bandwidth on demand and the spatial flow; With,
Subchannel mapping is used for the Sub-Channel Number of the bandwidth and the concrete correspondence of identification feedback subchannel.
In some optional embodiment, said CQI information comprises one or more in the following information:
Modulation coding mode MCS is used to identify the modulation coding mode of the frequency band of asking;
Type of coding is used to identify the coded system that STA recommends;
Signal to Interference plus Noise Ratio SINR is used to identify the average Signal to Interference plus Noise Ratio on institute's bandwidth on demand and the spatial flow; With,
Subchannel mapping is used for the Sub-Channel Number of the bandwidth and the concrete correspondence of identification feedback subchannel.
In some optional embodiment, said modulation coding mode is divided into first modulation coding mode and second modulation coding mode.
In order to solve the problems of the technologies described above, the present invention also provides a kind of network equipment, comprising:
Receiving element is used for receiver channel quality information CQI information;
Processing unit, being used for according to said CQI information is that downlink data transmission is selected suitable transmission mode.
In some optional embodiment, said receiving element also is used to receive upstream data, and said CQI information is utilized the uplink transmission resource transmission.
In some optional embodiment, said CQI information comprises one or more in the following information:
Modulation coding mode MCS is used to identify the modulation coding mode of the frequency band of asking;
Type of coding is used to identify the coded system that STA recommends;
Signal to noise ratio snr is used to identify the average signal-to-noise ratio on institute's bandwidth on demand and the spatial flow; With,
Subchannel mapping is used for the Sub-Channel Number of the bandwidth and the concrete correspondence of identification feedback subchannel.
In some optional embodiment, said CQI information comprises one or more in the following information:
Modulation coding mode MCS is used to identify the modulation coding mode of the frequency band of asking;
Type of coding is used to identify the coded system that STA recommends;
Signal to Interference plus Noise Ratio SINR is used to identify the average Signal to Interference plus Noise Ratio on institute's bandwidth on demand and the spatial flow; With,
Subchannel mapping is used for the Sub-Channel Number of the bandwidth and the concrete correspondence of identification feedback subchannel.
In some optional embodiment, said modulation coding mode is divided into first modulation coding mode and second modulation coding mode.
In order to solve the problems of the technologies described above, the present invention also provides a kind of terminal equipment, comprising:
Detecting unit is used to detect channel quality;
Comparing unit is used for said channel quality and threshold value are compared;
The resource request unit is used for requests resource allocation when said channel quality surpasses said threshold value, and receives the resource indication; With,
Report the unit, be used to utilize the indicated resource reporting channel quality information CQI information of said resource indication.
In some optional embodiment, said resource request unit carries resource request when sending uplink data frames, with requests resource allocation.
In some optional embodiment, said resource request is sent through the mode that is carried at the independent resource claim frame, or, through incidentally sending in the mode of uplink data frames with road resource request form.
In some optional embodiment, said resource request unit sends dispatch request, with requests resource allocation.
In some optional embodiment, said resource request unit sends the dispatch request sequence earlier, and the resource request of redispatching is with requests resource allocation.
In some optional embodiment, said resource request is sent through the mode that is carried at the independent resource claim frame.
In some optional embodiment, the indication of said resource comprises one or more in the following information: symbol offset, duration, subchannel mapping and CQI transmission mode; Wherein,
Said CQI transmission mode comprises modulation coding mode MCS and spatial flow number indication Nss.
In some optional embodiment, said CQI information comprises one or more in the following information:
Modulation coding mode MCS is used to identify the modulation coding mode of the frequency band of asking;
Type of coding is used to identify the coded system that STA recommends;
Signal to noise ratio snr is used to identify the average signal-to-noise ratio on institute's bandwidth on demand and the spatial flow; With,
Subchannel mapping is used for the Sub-Channel Number of the bandwidth and the concrete correspondence of identification feedback subchannel.
In some optional embodiment, said CQI information comprises one or more in the following information:
Modulation coding mode MCS is used to identify the modulation coding mode of the frequency band of asking;
Type of coding is used to identify the coded system that STA recommends;
Signal to Interference plus Noise Ratio SINR is used to identify the average Signal to Interference plus Noise Ratio on institute's bandwidth on demand and the spatial flow; With the mapping of, subchannel, be used for the Sub-Channel Number of the bandwidth and the concrete correspondence of identification feedback subchannel.
In some optional embodiment, said modulation coding mode is divided into first modulation coding mode and second modulation coding mode.
In order to solve the problems of the technologies described above, the present invention also provides a kind of network equipment, comprising:
First receiving element is used to receive resource request;
Transmitting element is used to send the resource indication;
Second receiving element is used for receiver channel quality information CQI information;
Processing unit, being used for according to said CQI information is that downlink data transmission is selected suitable transmission mode.
In some optional embodiment, said first receiving element receives uplink data frames, and this uplink data frames is carried resource request message, with requests resource allocation.
In some optional embodiment, the said first receiving element receiving scheduling request is with requests resource allocation.
In some optional embodiment, said CQI information comprises one or more in the following information:
Modulation coding mode MCS is used to identify the modulation coding mode of the frequency band of asking;
Type of coding is used to identify the coded system that STA recommends;
Signal to noise ratio snr is used to identify the average signal-to-noise ratio on institute's bandwidth on demand and the spatial flow; With,
Subchannel mapping is used for the Sub-Channel Number of the bandwidth and the concrete correspondence of identification feedback subchannel.
In some optional embodiment, said CQI information comprises one or more in the following information:
Modulation coding mode MCS is used to identify the modulation coding mode of the frequency band of asking;
Type of coding is used to identify the coded system that STA recommends;
Signal to Interference plus Noise Ratio SINR is used to identify the average Signal to Interference plus Noise Ratio on institute's bandwidth on demand and the spatial flow; With,
Subchannel mapping is used for the Sub-Channel Number of the bandwidth and the concrete correspondence of identification feedback subchannel.
In some optional embodiment, said modulation coding mode is divided into first modulation coding mode and second modulation coding mode.
In sum, provided by the inventionly be used to realize the adaptive technical scheme of uplink downlink, through the active feedback CQI information of STA based on threshold value, but real-time tracking reflection channel variation reduces overhead, optimization of system performance effectively; CAP can dispatch frequency spectrum resource adaptively, improves the availability of frequency spectrum and systematic function.
For above-mentioned and relevant purpose, one or more embodiment comprise the characteristic that the back will specify and in claim, particularly point out.Below explanation and accompanying drawing specify some illustrative aspects, and its indication only is some modes in the utilizable variety of way of principle of each embodiment.Other benefit and novel features will consider and become obviously along with following detailed description combine accompanying drawing, and the disclosed embodiments are to comprise being equal to of all these aspects and they.
Figure of description
Fig. 1 is the schematic flow sheet of the method for a kind of realization down link self adaption based on active feedback mechanism of providing of the embodiment of the invention one;
Fig. 2 is the structural representation of the channel quality information feedback frame that provides of the embodiment of the invention one;
Fig. 3 is the structural representation of the channel quality information feedback frame under special scenes that provides of the embodiment of the invention one;
Fig. 4 is the structural representation of the channel quality information feedback frame under special scenes that provides of the embodiment of the invention one;
Fig. 5 is the frame part sketch map of a kind of channel quality information feedback frame of providing for the embodiment of the invention one;
Fig. 6 is the frame part sketch map of a kind of channel-quality feedback frame of providing for the embodiment of the invention one;
Fig. 7 is the frame part sketch map of a kind of channel-quality feedback frame of providing for the embodiment of the invention one;
Fig. 8 is the structural representation of a kind of network equipment of providing of the embodiment of the invention two;
Fig. 9 is the structural representation of a kind of terminal equipment of providing of the embodiment of the invention two;
Figure 10 is the schematic flow sheet of the method for a kind of realization down link self adaption based on active feedback mechanism of providing of the embodiment of the invention three;
Figure 11 is the structural representation of a kind of terminal equipment of providing of the embodiment of the invention three;
Figure 12 is the schematic flow sheet of the method for a kind of realization down link self adaption based on active feedback mechanism of providing of the embodiment of the invention four.
Embodiment
Below description and accompanying drawing illustrate specific embodiments of the present invention fully, to enable those skilled in the art to put into practice them.Other embodiments can comprise structure, logic, electric, process and other change.Embodiment only represents possible variation.Only if explicitly call for, otherwise independent assembly and function are optional, and the order of operation can change.The part of some embodiments and characteristic can be included in or replace the part and the characteristic of other embodiments.The scope of embodiment of the present invention comprises the gamut of claims, and all obtainable equivalents of claims.In this article; These embodiments of the present invention can be represented with term " invention " individually or always; This only is for ease, and if in fact disclose and surpass one invention, not that the scope that will automatically limit this application is any single invention or inventive concept.
In view of the deficiency that exists in the prior art, the present invention proposes a kind of adaptive method of uplink downlink that is used to realize, can improve frequency spectrum resource utilization rate and systematic function.
Link circuit self-adapting and other mechanism are inseparable such as mechanism such as wave beam forming and multi-user MU-MIMO.All be the adaptive technique that adopts for adaptive channel variation, raising link and power system capacity, they can share a part of feedback result, and perhaps responder calculating feedback result need be considered simultaneously.The present invention has only considered the link circuit self-adapting implementation method based on channel quality information feedback.
The network equipment of mentioning among the present invention is access point AP, central access point CAP or base station or other network equipment for example; Terminal equipment is user site STA, terminal or other terminal equipment for example; Below all be CAP with the network equipment; Terminal equipment is that STA is that example describes, but is not limited only to CAP and STA.
Among the present invention, to the short-distance and medium-distance wireless communication system, link adaptation mechanism comprises down link self adaption and adaptive uplink.Wherein down link self adaption refers to the link circuit self-adapting on the direction from CAP to STA; Adaptive uplink refers to the link circuit self-adapting on the direction from STA to CAP.
Down link self adaption
In the short-distance and medium-distance wireless communication system, downlink data transmission is supported link adaptation mechanism.CAP can be according to the CQI information of STA feedback, and for STA selects different transport parameters for physical layer, this parameter comprises: MIMO mode of operation, space fluxion, code modulation mode MCS and transmitted power etc. adaptively.
The feedback mechanism of down link self adaption support comprises following three kinds: periodic feedback mechanism, based on the feedback mechanism of request-response and the feedback mechanism of active response.
The feedback mechanism that the present invention is primarily aimed at active response is elaborated.
Embodiment one
The embodiment of the invention one has proposed a kind of method that is used to realize down link self adaption, adopts active feedback mechanism, comprises following step:
Step S101, STA channel quality, if in case above threshold value, STA can initiatively send CQI information to AP.Wherein, this threshold value is that STA is provided with in advance.
Preferably, STA detects the channel quality of down channel, and channel quality and threshold value are compared, and when channel quality surpasses threshold value, reports, and STA can initiatively report CQI information to CAP.
Preferably, obtaining of feedback resource requirement can be through following three kinds of modes:
First kind: the CQI feedback directly is in the same place with data aggregate, utilizes the upstream data resource of having distributed to transmit;
Second kind: STA carries the resource request that corresponding CQI reports in uplink data frames, CAP Resources allocation then, and STA sends CQI information to AP again;
The third: STA sends resource request through sending the dispatch request sequence, is the resource allocation of CQI feedback request.Preferably, STA is through sending the dispatch request sequence earlier, and the resource request of redispatching is the resource allocation of CQI feedback request.
Active feedback is based on that channel estimating or the descending sounding channel of the physical layer transmission unit (PPDU) of nearest reception calculate.
Preferably, CQI information can be packaged into mac frame, constitutes channel quality information CQI feedback frame.The CQI feedback frame comprises mac frame head, frame and FCS, and frame partial information wherein can comprise the CQI information of each bandwidth of operation.Wherein CQI information can comprise one or more in the following information: modulation coding mode (MCS; Fluxion (Nss), type of coding (LDPC/BCC) and signal to noise ratio (signal noise ratio) (SNR when Modulation and Coding Scheme), empty; Signal To Noise Ratio) or Signal to Interference plus Noise Ratio (be signal interference plus noise than) (SINR, Signal To Interference Noise Ratio)).
Preferably, for example shown in Figure 2, CQI information can comprise: fluxion (Nss), type of coding (LDPC/BCC) and signal to noise ratio (snr) (or Signal to Interference plus Noise Ratio (SINR)) when modulation coding mode (MCS), sky.
Preferably, for example shown in Figure 3, CQI information also can comprise MCS, type of coding and SNR (or SINR), and fluxion (Nss) can comprise sky in the modulation coding mode (MCS) time.Wherein, MCS is used to identify the modulation coding mode of the frequency band of asking.Type of coding is used for the coded system that marking terminal is recommended.SNR be used to identify the average signal noise ratio on each spatial flow of the channel of asking, SINR be used to identify average signal or the interference plus noise ratio on each spatial flow of the channel of asking.
Preferably, for example shown in Figure 4, CQI information also can comprise subchannel mapping, is used for the Sub-Channel Number of the bandwidth and the concrete correspondence of identification feedback subchannel.
Preferably, if system supports 8 spatial flow transmission, and a MCS supports 4 spatial flow transmission at most; Therefore need two MCS, as shown in Figure 6, MCS also can be divided into 2; The i.e. first modulation coding mode MCS1; The MCS of expression request channel code word 1, and the second modulation coding mode MCS2, the MCS of expression request channel code word 2.Preferably, CQI information can comprise subchannel mapping, MCS1, MCS2, type of coding and SINR.The content of this CQI information is as shown in table 1:
Table 1
When system works during at 20MHz, the frame of channel-quality feedback frame part is shown in Fig. 3 or 4 or 5.
When system works during at 40MHz aggregation scheme 1, the frame part of channel-quality feedback frame is as shown in Figure 6.
When system works during at 80MHz aggregation scheme 1, CQI_FB frame part is as shown in Figure 7.
When system works during at 40MHz aggregation scheme 2, CQI_FB frame part is as shown in Figure 5.
When 80MHz system works during at continuous 40MHz, CQI_FB frame part is as shown in Figure 6.
When system works during at continuous 80MHz, CQI_FB frame part is as shown in Figure 5.
About aggregation scheme above-mentioned, specifically describe below:
Spectrum aggregating
This part is fundamental channel bandwidth with 20MHz, can support 40MHz and the continuous or discontinuous bandwidth of 80MHz frequency spectrum through spectrum aggregating.
Aggregation scheme 1: each 20MHz subchannel is an independent channel, and 20MHz, 40MHz and 80MHzSTA can be scheduled in independent transmission on one or more 20MHz subchannels;
Aggregation scheme 2: a plurality of continuous 20MHz subchannel polymerizations, 40MHz and 80MHz STA can transmit in aggregated channel upper frequency territory continuously.
20MHz STA can only selective polymerization pattern 1, and 40MHz and 80MHz STA can select aggregation scheme 1 or 2.
Step S102, CAP receive after the CQI information of each STA feedback, are that downlink data transmission is selected suitable transmission mode according to CQI information.
Preferably, CAP receives after the CQI information of each STA feedback, in conjunction with upper-layer service information, and according to the CQI information of being fed back, in the descending scheduling of follow-up STA, confirms its transmission parameter, sends data to corresponding STA.
For realizing said method, the embodiment of the invention one has also proposed a kind of system that is used to realize link circuit self-adapting, comprising:
User site STA is used to detect channel quality, if in case above threshold value, STA can initiatively send CQI information to AP;
Central access point CAP is used to receive after the CQI information of each STA feedback, in conjunction with upper-layer service information, and according to the CQI information of being fed back, in the descending scheduling of follow-up STA, confirms its transmission parameter, sends data to corresponding STA.
The system that is used to realize link circuit self-adapting that the embodiment of the invention one provides, basic identical in its operation principle and associative operation flow process and the preceding method embodiment, repeat no more at this.
The technical scheme that is used to realize down link self adaption that adopts the embodiment of the invention one to provide, through the active feedback CQI information of STA based on threshold value, but real-time tracking reflection channel variation reduces overhead, optimization of system performance effectively; CAP can dispatch frequency spectrum resource adaptively, improves the availability of frequency spectrum and systematic function.
Three kinds of modes are elaborated through following three embodiment respectively particularly.
Embodiment two
The embodiment of the invention two has proposed a kind of method that is used to realize down link self adaption, adopts active feedback mechanism, and is as shown in Figure 1, comprises following step:
Step S201, STA detect channel quality, and channel quality and preset threshold value are compared, and when channel quality surpasses threshold value, report CQI information.Wherein, this threshold value is that STA is provided with in advance.
Preferably, STA detects the channel quality of down channel.
Preferably, STA can with CQI information directly and upstream data condense together, report CQI information.Preferably, utilize the upstream data resource reporting CQI information of having distributed.
Present embodiment two is to distribute under the situation of upstream data resource to STA in advance at CAP, is used for the STA transmit ascending data and gives CAP.
Wherein, CQI information, its describe with embodiment one in identical, repeat no more at this.
Step S202, CAP receive after the CQI information of each STA feedback, according to the CQI information of terminal equipment feedback, for downlink data transmission is selected suitable transmission mode.
For realizing the above-mentioned method that is used to realize link circuit self-adapting, the embodiment of the invention two also provides a kind of network equipment, and is as shown in Figure 8, comprising:
Receiving element 11 is used to receive upstream data and channel quality information CQI information;
Processing unit 12, being used for according to said CQI information is that downlink data transmission is selected suitable transmission mode.
Preferably, receiving element 11 receives upstream data, and said upstream data and channel quality information CQI information fusion are together.
For realizing the above-mentioned method that is used to realize link circuit self-adapting, the embodiment of the invention two also provides a kind of terminal equipment, and is as shown in Figure 9, comprising:
Detecting unit 21 is used to detect channel quality;
Comparing unit 22 is used for channel quality and threshold value are compared; With,
Report unit 23, be used for when channel quality surpasses threshold value, reporting CQI information.
Preferably, report unit 23 can CQI information and upstream data be condensed together, report CQI information.
For realizing the above-mentioned method that is used to realize link circuit self-adapting, the embodiment of the invention two also provides a kind of system that is used to realize link circuit self-adapting, comprises the network equipment and terminal equipment like present embodiment two.
The system that is used to realize link circuit self-adapting, the network equipment and terminal equipment that the embodiment of the invention two provides; Its operation principle and associative operation flow process and aforementioned based on basic identical in the method embodiment that realizes down link self adaption under the periodic feedback mechanism repeat no more at this.
The technical scheme that is used to realize down link self adaption that adopts the embodiment of the invention two to provide, through the active feedback CQI information of STA based on threshold value, but real-time tracking reflection channel variation reduces overhead, optimization of system performance effectively; CAP can dispatch frequency spectrum resource adaptively, improves the availability of frequency spectrum and systematic function.
Embodiment three
The embodiment of the invention three has proposed a kind of method that is used to realize down link self adaption, adopts active feedback mechanism, and is shown in figure 10, comprises following step:
Step S301, STA detect channel quality, and channel quality and threshold value are compared requests resource allocation when channel quality surpasses threshold value.Preferably, STA detects the channel quality of down channel.Wherein, this threshold value is that STA is provided with in advance.
Preferably, STA utilizes the resource of having distributed, in the uplink data frames of sending to CAP, carries the resource request that reports CQI, with requests resource allocation; Preferably, this resource request can perhaps through with road resource request form, incidentally be sent in the mode of uplink data frames through incidentally sending in the mode of independent resource claim frame.
Step S302, CAP send the resource indication to STA, promptly give the STA Resources allocation.
Preferably, the indication of this resource specifically comprises one or more in the following information: symbol offset, duration, subchannel mapping and CQI transmission mode; Wherein, the CQI transmission mode comprises modulation coding mode MCS and spatial flow number indication Nss.
Step S303, STA receive the resource indication, utilize the indicated resource reporting CQI information of resource indication.
Wherein, CQI information, its describe with embodiment one in identical, repeat no more at this.
Present embodiment three is to distribute under the situation of upstream data resource to STA in advance at CAP, is used for the STA transmit ascending data and gives CAP.
Step S304, CAP receive after the CQI information of each STA feedback, according to this CQI information, for downlink data transmission is selected suitable transmission mode.
For realizing the above-mentioned method that is used to realize link circuit self-adapting, the embodiment of the invention three also provides a kind of network equipment, and is shown in figure 11, comprising:
First receiving element 31 is used to receive resource request;
Transmitting element 32 is used to send the resource indication;
Second receiving element 33 is used for receiver channel quality information CQI information;
Processing unit 34, being used for according to CQI information is that downlink data transmission is selected suitable transmission mode.
Preferably, first receiving element 31 receives uplink data frames, and this uplink data frames is carried resource request message, with requests resource allocation.
For realizing the above-mentioned method that is used to realize link circuit self-adapting, the embodiment of the invention three also provides a kind of terminal equipment, and is shown in figure 12, comprising:
Detecting unit 41 is used to detect channel quality;
Comparing unit 42 is used for channel quality and threshold value are compared;
Resource request unit 43 is used for requests resource allocation when channel quality surpasses threshold value, and receives the resource indication; With,
Report unit 44, be used to utilize the indicated resource reporting CQI information of resource indication.
Preferably, resource request unit 43 carries resource request message when sending uplink data frames, with requests resource allocation.
For realizing the above-mentioned method that is used to realize link circuit self-adapting, the embodiment of the invention three also provides a kind of system that is used to realize link circuit self-adapting, comprises the network equipment and terminal equipment like present embodiment three.
The system that is used to realize link circuit self-adapting, the network equipment and terminal equipment that the embodiment of the invention three provides; Its operation principle and associative operation flow process and aforementioned based on basic identical in the method embodiment that realizes down link self adaption under the periodic feedback mechanism repeat no more at this.
The technical scheme that is used to realize down link self adaption that adopts the embodiment of the invention three to provide, through the active feedback CQI information of STA based on threshold value, but real-time tracking reflection channel variation reduces overhead, optimization of system performance effectively; CAP can dispatch frequency spectrum resource adaptively, improves the availability of frequency spectrum and systematic function.
Embodiment four
The embodiment of the invention four has proposed a kind of method that is used to realize down link self adaption, adopts active feedback mechanism, and is shown in figure 10, comprises following step:
Step S301, STA detect channel quality, and channel quality and threshold value are compared requests resource allocation when channel quality surpasses threshold value.Preferably, STA detects the channel quality of descending sounding channel.
Preferably, STA sends dispatch request to CAP, with requests resource allocation; Preferably, STA can be through sending the dispatch request sequence earlier, and the resource request of redispatching is the resource allocation of CQI feedback request.Preferably, this resource request is sent through the mode that is carried at uplink data frames.
Step S402, CAP send the resource indication to STA, promptly give the STA Resources allocation.
Preferably, the indication of this resource specifically comprises one or more in the following information: symbol offset, duration, subchannel mapping and CQI transmission mode; Wherein, the CQI transmission mode comprises modulation coding mode MCS and spatial flow number indication Nss.
Step S303, STA receive the resource indication, utilize the indicated resource reporting CQI information of resource indication.
Wherein, CQI information, its describe with embodiment one in identical, repeat no more at this.
Present embodiment four is to distribute under the situation of upstream data resource to STA in advance at CAP, is used for the STA transmit ascending data and gives CAP.
Step S304, CAP receive after the CQI information of each STA feedback, according to this CQI information, for downlink data transmission is selected suitable transmission mode.
For realizing the above-mentioned method that is used to realize link circuit self-adapting, the embodiment of the invention three also provides a kind of network equipment, and is shown in figure 11, comprising:
First receiving element 31 is used to receive resource request;
Transmitting element 32 is used to send the resource indication;
Second receiving element 33 is used for receiver channel quality information CQI information;
Processing unit 34, being used for according to CQI information is that downlink data transmission is selected suitable transmission mode.
Preferably, the 31 receiving scheduling requests of first receiving element, this dispatch request is used for requests resource allocation.
Preferably, first receiving element, 31 first receiving scheduling request sequences receive resource request again, and this resource request is used to the resource allocation of CQI feedback request.
For realizing the above-mentioned method that is used to realize link circuit self-adapting, the embodiment of the invention four also provides a kind of terminal equipment, and is shown in figure 12, comprising:
Detecting unit 41 is used to detect channel quality;
Comparing unit 42 is used for channel quality and threshold value are compared;
Resource request unit 43 is used for requests resource allocation when channel quality surpasses threshold value, and receives the resource indication; With,
Report unit 44, be used to utilize the indicated resource reporting CQI information of resource indication.
Preferably, resource request unit 43 sends dispatch request, with requests resource allocation; Preferably, resource request unit 43 can be through sending the dispatch request sequence earlier, and the resource request of redispatching is the resource allocation of CQI feedback request.
For realizing the above-mentioned method that is used to realize link circuit self-adapting, the embodiment of the invention four also provides a kind of system that is used to realize link circuit self-adapting, comprises the network equipment and terminal equipment like present embodiment four.
The system that is used to realize link circuit self-adapting, the network equipment and terminal equipment that the embodiment of the invention four provides; Its operation principle and associative operation flow process and aforementioned based on basic identical in the method embodiment that realizes down link self adaption under the periodic feedback mechanism repeat no more at this.
The technical scheme that is used to realize down link self adaption that adopts the embodiment of the invention four to provide through STA active feedback CQI information, can be dispatched frequency spectrum resource adaptively, improves the availability of frequency spectrum and systematic function.
The embodiment of the invention is that example describes with the short-distance and medium-distance communication system only, but is not limited only to be applicable to the short-distance and medium-distance communication system, and the system that other adopt method of the present invention to realize is all within protection range.
In sum, the technical scheme that is used to realize down link self adaption provided by the invention, through the active feedback CQI information of STA based on threshold value, but real-time tracking reflection channel variation reduces overhead, optimization of system performance effectively; CAP can dispatch frequency spectrum resource adaptively, improves the availability of frequency spectrum and systematic function.
Should be understood that the particular order of the step in the disclosed process or the instance that level is illustrative methods.Based on design preference, should be appreciated that the particular order of the step in the process or level can be rearranged under the situation that does not break away from protection range of the present disclosure.Appended claim to a method has provided the key element of various steps with exemplary order, and is not to be limited to described particular order or level.
In above-mentioned detailed description, various characteristics are combined in the single embodiment together, to simplify the disclosure.Should this open method be interpreted as and reflect such intention, that is, the embodiment of theme required for protection need be than the more characteristic of clearly in each claim, being stated of characteristic.On the contrary, that kind of liking enclosed that claims reflected, the present invention is in the state that lacks than whole characteristics of disclosed single embodiment.Therefore, appending claims clearly is merged in the detailed description hereby, and wherein every claim is alone as the independent preferred embodiment of the present invention.
The description of preceding text comprises giving an example of one or more embodiment.Certainly, all possible combination of describing parts or method in order to describe the foregoing description is impossible, but those of ordinary skills should be realized that each embodiment can do further combination and arrangement.Therefore, the embodiment that describes among this paper is intended to contain all such changes, modification and the modification in the protection range that falls into appended claims.In addition, " comprise " with regard to the term that uses in specification or claims, the mode that contains of this speech is similar to term and " comprises ", just in claim, is used as that kind that link word is explained as " comprising, ".In addition, using any one term " perhaps " in the specification of claims is to represent " non-exclusionism perhaps ".

Claims (34)

1. a method that is used to realize link circuit self-adapting is characterized in that, comprising:
Terminal equipment detects channel quality, and said channel quality and threshold value are compared, reporting channel quality information CQI information when said channel quality surpasses said threshold value;
The network equipment receives said CQI information, and is that downlink data transmission is selected suitable transmission mode according to said CQI information.
2. the method for claim 1 is characterized in that, said terminal equipment utilizes the transmitting uplink data resource, reports said CQI information.
3. according to claim 1 or claim 2 method is characterized in that, said CQI information comprises one or more in the following information:
Modulation coding mode MCS is used to identify the modulation coding mode of the frequency band of asking;
Type of coding is used to identify the coded system that STA recommends;
Signal to Interference plus Noise Ratio SINR is used to identify the average Signal to Interference plus Noise Ratio on institute's bandwidth on demand and the spatial flow; With,
Subchannel mapping is used for the Sub-Channel Number of the bandwidth and the concrete correspondence of identification feedback subchannel.
4. method as claimed in claim 3 is characterized in that, said modulation coding mode is divided into first modulation coding mode and second modulation coding mode.
5. a method that is used to realize link circuit self-adapting is characterized in that, comprising:
Terminal equipment detects channel quality, and said channel quality and threshold value is compared requests resource allocation when said channel quality surpasses said threshold value;
The network equipment sends the resource indication;
Said terminal equipment utilizes the indicated resource reporting channel quality information CQI information of said resource indication;
The said network equipment receives said CQI information, and is that downlink data transmission is selected suitable transmission mode according to said CQI information.
6. method as claimed in claim 5 is characterized in that, said terminal equipment carries resource request when sending uplink data frames, with requests resource allocation.
7. method as claimed in claim 6 is characterized in that, said resource request is sent through the mode that is carried at the independent resource claim frame, or, through incidentally sending in the mode of uplink data frames with road resource request form.
8. method as claimed in claim 5 is characterized in that, said terminal equipment sends dispatch request, with requests resource allocation.
9. method as claimed in claim 8 is characterized in that, said terminal equipment sends the dispatch request sequence earlier, and the resource request of redispatching is with requests resource allocation.
10. method as claimed in claim 9 is characterized in that, said resource request is sent through the mode that is carried at the independent resource claim frame.
11. method as claimed in claim 5 is characterized in that, the indication of said resource specifically comprises one or more in the following information: symbol offset, duration, subchannel mapping and CQI transmission mode; Wherein,
Said CQI transmission mode comprises modulation coding mode MCS and spatial flow number indication Nss.
12., it is characterized in that said CQI information comprises one or more in the following information like each described method of claim 5 to 11:
Modulation coding mode MCS is used to identify the modulation coding mode of the frequency band of asking;
Type of coding is used to identify the coded system that STA recommends;
Signal to Interference plus Noise Ratio SINR is used to identify the average Signal to Interference plus Noise Ratio on institute's bandwidth on demand and the spatial flow; With,
Subchannel mapping is used for the Sub-Channel Number of the bandwidth and the concrete correspondence of identification feedback subchannel.
13. method as claimed in claim 12 is characterized in that, said modulation coding mode is divided into first modulation coding mode and second modulation coding mode.
14. a terminal equipment is characterized in that, comprising:
Detecting unit is used to detect channel quality;
Comparing unit is used for said channel quality and threshold value are compared; With,
Report the unit, be used for reporting channel quality information CQI information when said channel quality surpasses said threshold value.
15. terminal equipment as claimed in claim 14 is characterized in that, the said unit by using transmitting uplink data resource that reports reports said CQI information.
16., it is characterized in that said CQI information comprises one or more in the following information like claim 14 or 15 described terminal equipments:
Modulation coding mode MCS is used to identify the modulation coding mode of the frequency band of asking;
Type of coding is used to identify the coded system that STA recommends;
Signal to Interference plus Noise Ratio SINR is used to identify the average Signal to Interference plus Noise Ratio on institute's bandwidth on demand and the spatial flow; With,
Subchannel mapping is used for the Sub-Channel Number of the bandwidth and the concrete correspondence of identification feedback subchannel.
17. terminal equipment as claimed in claim 16 is characterized in that, said modulation coding mode is divided into first modulation coding mode and second modulation coding mode.
18. a network equipment is characterized in that, comprising:
Receiving element is used for receiver channel quality information CQI information;
Processing unit, being used for according to said CQI information is that downlink data transmission is selected suitable transmission mode.
19. the network equipment as claimed in claim 18 is characterized in that, said receiving element also is used to receive upstream data, and said CQI information is utilized the uplink transmission resource transmission.
20., it is characterized in that said CQI information comprises one or more in the following information like the claim 18 or the 19 described network equipments:
Modulation coding mode MCS is used to identify the modulation coding mode of the frequency band of asking;
Type of coding is used to identify the coded system that STA recommends;
Signal to Interference plus Noise Ratio SINR is used to identify the average Signal to Interference plus Noise Ratio on institute's bandwidth on demand and the spatial flow; With,
Subchannel mapping is used for the Sub-Channel Number of the bandwidth and the concrete correspondence of identification feedback subchannel.
21. a terminal equipment is characterized in that, comprising:
Detecting unit is used to detect channel quality;
Comparing unit is used for said channel quality and threshold value are compared;
The resource request unit is used for requests resource allocation when said channel quality surpasses said threshold value, and receives the resource indication; With,
Report the unit, be used to utilize the indicated resource reporting channel quality information CQI information of said resource indication.
22. terminal equipment as claimed in claim 21 is characterized in that, said resource request unit carries resource request when sending uplink data frames, with requests resource allocation.
23. terminal equipment as claimed in claim 22 is characterized in that, said resource request is sent through the mode that is carried at the independent resource claim frame, or, through incidentally sending in the mode of uplink data frames with road resource request form.
24. terminal equipment as claimed in claim 21 is characterized in that, said resource request unit sends dispatch request, with requests resource allocation.
25. terminal equipment as claimed in claim 24 is characterized in that, said resource request unit sends the dispatch request sequence earlier, and the resource request of redispatching is with requests resource allocation.
26. terminal equipment as claimed in claim 25 is characterized in that, said resource request is sent through the mode that is carried at the independent resource claim frame.
27. terminal equipment as claimed in claim 21 is characterized in that, the indication of said resource comprises one or more in the following information: symbol offset, duration, subchannel mapping and CQI transmission mode; Wherein,
Said CQI transmission mode comprises modulation coding mode MCS and spatial flow number indication Nss.
28., it is characterized in that said CQI information comprises one or more in the following information like each described terminal equipment of claim 21 to 27:
Modulation coding mode MCS is used to identify the modulation coding mode of the frequency band of asking;
Type of coding is used to identify the coded system that STA recommends;
Signal to Interference plus Noise Ratio SINR is used to identify the average Signal to Interference plus Noise Ratio on institute's bandwidth on demand and the spatial flow; With,
Subchannel mapping is used for the Sub-Channel Number of the bandwidth and the concrete correspondence of identification feedback subchannel.
29. terminal equipment as claimed in claim 28 is characterized in that, said modulation coding mode is divided into first modulation coding mode and second modulation coding mode.
30. a network equipment is characterized in that, comprising:
First receiving element is used to receive resource request;
Transmitting element is used to send the resource indication;
Second receiving element is used for receiver channel quality information CQI information;
Processing unit, being used for according to said CQI information is that downlink data transmission is selected suitable transmission mode.
31. the network equipment as claimed in claim 30 is characterized in that, said first receiving element receives uplink data frames, and this uplink data frames is carried resource request, and this resource request is used for requests resource allocation.
32. the network equipment as claimed in claim 30 is characterized in that, the said first receiving element receiving scheduling request, and this dispatch request is used for requests resource allocation.
33. the network equipment as claimed in claim 32 is characterized in that, the first receiving scheduling request sequence of said first receiving element receives resource request again, and this request is used for requests resource allocation.
34., it is characterized in that said CQI information comprises one or more in the following information like each described network equipment of claim 30 to 33:
Modulation coding mode MCS is used to identify the modulation coding mode of the frequency band of asking;
Type of coding is used to identify the coded system that STA recommends;
Signal to Interference plus Noise Ratio SINR is used to identify the average Signal to Interference plus Noise Ratio on institute's bandwidth on demand and the spatial flow; With,
Subchannel mapping is used for the Sub-Channel Number of the bandwidth and the concrete correspondence of identification feedback subchannel.
CN2012100572529A 2011-03-31 2012-03-06 Method for achieving link adaptation, terminal device and network device Pending CN102752867A (en)

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Application publication date: 20121024