EP2361471A2 - Techniques de transmission de données sur la qualité de canaux dans des systèmes sans fil - Google Patents

Techniques de transmission de données sur la qualité de canaux dans des systèmes sans fil

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Publication number
EP2361471A2
EP2361471A2 EP09824209A EP09824209A EP2361471A2 EP 2361471 A2 EP2361471 A2 EP 2361471A2 EP 09824209 A EP09824209 A EP 09824209A EP 09824209 A EP09824209 A EP 09824209A EP 2361471 A2 EP2361471 A2 EP 2361471A2
Authority
EP
European Patent Office
Prior art keywords
fast feedback
feedback channel
primary
channel
channels
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09824209A
Other languages
German (de)
English (en)
Inventor
Yuan Zhu
Qinghua Li
Hujun Yin
Hongmei Sun
Changlong Xu
Yang Gao
Jong-Kae Fwu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhang Senjie
Intel Corp
Original Assignee
Zhang Senjie
Intel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US12/459,268 external-priority patent/US8200165B2/en
Application filed by Zhang Senjie, Intel Corp filed Critical Zhang Senjie
Publication of EP2361471A2 publication Critical patent/EP2361471A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/24—Monitoring; Testing of receivers with feedback of measurements to the transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0057—Block codes
    • 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
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network

Definitions

  • DL DL transmissions will support multiple modes.
  • the ability to adaptively switch among the transmission modes according to a mobile stations (MS) channel and traffic condition is critical to optimize the DL performance to achieve required capacity targets.
  • a fast feedback channel is used to feed back the data of channel quality indicator and multiple input multiple output (MIMO) related feedback to support DL adaptation.
  • MIMO multiple input multiple output
  • fast feedback channels need to: 1) Feed back the appropriate metric for DL adaptation; 2) Reduce feedback latency to allow robust operation at higher speed; 3) Control feedback overhead to manage UL efficiency; and 4)Control feedback reliability to allow DL optimization.
  • FIG. 1 depicts an example of periodicity and frequency of primary and secondary fast feedback channels in the time domain
  • FIG. 2 depicts PCQICH with two 3x6 FMTs of an embodiment of the present invention
  • FIG. 3 depicts a channel structure for UL Primary Feedback Channel according to an embodiment of the present invention
  • FIG. 4 depicts a tile structure (3x6) for PCQICH according to an embodiment of the present invention
  • FIG. 5 depicts control tile structures for SCQICH according to an embodiment of the present invention
  • FIG. 6 depicts a tile structure and the mapping from coded block to tile structure 2x6 according to an embodiment of the present invention
  • FIG. 7 depicts the channel structure of an uplink secondary fast feedback channel according to an embodiment of the present invention.
  • FIG. 8 depicts a SNR vs. PER curve of a 4-bit PCQICH (PB-3kmph and PA- 3kmph) of tile size 3x6/6x6 according to an embodiment of the present invention
  • FIG. 9 shows a SNR vs. PER curve of 4/5/6-bit PCQICH (PB-3kmph and VA- 350kmph) of tile size 2x6 according to an embodiment of the present invention
  • FIG. 10 shows SNR vs. PER curve of 11-bit SCQICH (PB-3kmph, 1x2 and 1x4) according to an embodiment of the present invention
  • FIG. 11 shows a SNR vs. PER curve of 22-bit SCQICH (PB-3kmph, PA-3kmph, 1x2) according to an embodiment of the present invention.
  • FIG. 12 illustrates a SNR vs. PER curve of 12/24-bit SCQICH (PB-3kmph, 1x2,
  • plality and a plurality as used herein may include, for example, “multiple” or “two or more”.
  • the terms “plurality” or “a plurality” may be used throughout the specification to describe two or more components, devices, elements, units, parameters, or the like.
  • a plurality of stations may include two or more stations.
  • Embodiments of the present invention provide a novel, fast feedback channel design for wireless systems which may include a 2-two level adaptive primary/secondary fast feedback channel framework.
  • This primary/secondary fast feedback channel framework may further include the separation of UL fast feedback channels into primary (wideband CQI reports with fixed robust rate) and secondary (sub-band CQI reports with adaptive rate) UL fast feedback channels; and link adaptation on the secondary UL fast feedback channel with event-driven transmission, which may significantly improve the transmission efficiency with reduced overhead.
  • This also allows flexibility for independent fast feedback channel design in order to optimize each channel performance (for example, the two channel might achieve optimal performance under different permutation modes)
  • An embodiment of the present invention provides that optimized BCH codes may be used for both primary (PCQICH) and secondary (SCQICH) fast feedback channels with simplified design and reduced complexity - although the present invention is not limited in this respect. This can be easily fit to different tile sizes.
  • Embodiments of the present invention provide semi-orthogonal sequences of length 12 for PCQICH supporting up to 6 information bits with optimized performance and may take advantage of larger diversity order.
  • Embodiments of the present invention may also provide detail tile size and pilot pattern and receiver detection methods for fast feedback channel design, which can take advantage of both coding gain and frequency diversity gain.
  • some embodiments provide an advanced non-coherent receiver which supports fast feedback channel transmissions with non-coherent detection in very high speed, like 350kmph.
  • 2-level adaptive primary/secondary fast feedback channel framework link adaptation for SCQICH
  • channel structure of proposed fast feedback channel design advanced non-coherent receiver and codes for PCQICH and SCQICH.
  • UL fast feedback channels are classified into 2 channels, categorized as a primary fast feedback channel (PCQICH) and a secondary fast feedback channel (SCQICH), and each of them may contain one or more types of fast feedback information.
  • the primary CQI channel supports low rate, less frequent, periodic CQI feedback transmission. It is primarily designed to transmit average CQI and MIMO feedback information and provide reliable basic connections.
  • PCQICH is available to all users who need to feedback CQI in UL.
  • Base Station allocates resources for primary fast feedback channel and specifies the feedback frequency based on each individual user's channel variation characteristics. This information is sent to subscriber stations (SS) to regulate its CQI feedback behavior.
  • the secondary fast feedback channel is designed to support more advanced features (e.g, MIMO, FFR, frequency selective scheduling (FSS)) with better efficiency and is used when there is data to be transmitted and it can provide CQI feedback more frequently and with finer granularity. That is, SCQICH supports high payload feedback of narrow band CQI and MIMO feedback information (which includes MIMO effective SINR per codeword, transmission rank, and PMI etc.) only on demand and the transmission can be event driven.
  • MIMO massive MIMO
  • FFR frequency selective scheduling
  • SCQICH targets to cover users with localized resource allocation at downlink that requires to feedback more CQI to support features such as FSS, MIMO etc., while users with very poor channel quality might not achieve meaningful gain feeding more CQI using secondary fast feedback channel.
  • BS Per request from SS, BS will decide whether to allocate secondary fast feedback channel, when to allocate, the amount of resources and corresponding index, transmission frequency, rate, and relay these information to SS.
  • primary fast feedback channel 120 supports each user to feedback CQIs periodically in multiple of frames. Users' CQI feedback on secondary fast feedback control channel may be more frequent than that on primary fast feedback control channel.
  • Secondary fast feedback channel's allocation can be event driven depending on the user's traffic condition and channel variation.
  • the ULSFBCH is allocated only when there is traffic in the buffer 110 or expected arrive within the next n frames and turned off when there is no traffic in the buffer 130 and not expected to arrive within the next m frames.
  • the primary fast feedback channel can provide a reference for power control. This reference can be used for power controlling both data channel and secondary fast feedback channel.
  • Secondary fast feedback channel requires UL power control to help UE to achieve a minimum SINR so that the lowest MCS level can be supported.
  • Link adaptation for SCQICH There are multiple ways to support link adaptations on SCQICH. Design Option 1 :
  • Link adaptation can be based on long term channel statistics (ex, UL geometry SINR measured over a long term at the base station).
  • Design Option 2 SS starts to transmit using the lowest modulation.
  • BS tunes the rate based on channel measurement using UL dedicated pilot of SCQICH once SS gets allocated and starts to feed back CQI on SCQICH.
  • Design option 3 PCQICH provides dedicated pilots to facilitate channel measurement for each user. For users that use SCQICH, initial MCS level is selected based on channel quality measured by PCQICH, and the rate of each user can be turned in similar way as Design option 2.
  • Design option 4 to adaptive rate based on dedicated pilots of candidate (sounding) subchannels.
  • BS allocates candidate channels to users requesting to transmit CQI in SCQICH.
  • the channel qualities of these candidate subchannels for each user are measured by dedicated pilots.
  • the corresponding MCSs of SCQICH in the specified subchannel for selected users are allocated.
  • the CQI data are transmitted in the allocated subchannels.
  • link adaptation can only be coarse in the sense that certain amount of margin needs to be maintained to compensate the UL indeterminable channel variation.
  • the proposed block codes based unified coding can support up to 12/24 information bits as described below, based on one specific tile structure (3x6 or 6x6, or 2x6), but the design can be easily adapt to different resource block size (or tile structure) and the present invention is not intended to be limited in this respect.
  • PCQICH There are 3 ways to design PCQICH depending on if the permutation mode of the UL feedback channel is localized, distributed or hopping localized, while the latter two share the same tile structure and pilot patterns.
  • a PCQICH logical channel occupies one tiles size of 6 contiguous subcarriers by 6 OFDM symbols (6x6 for short), which is chosen from different UL localized control resource units to achieve more spreading gain, while in the other two permutation modes, there are 2 ways: I) A PCQICH logical channel occupies 2 UL feedback mini-tiles (UL FMT), which are chosen from different UL distributed control resource units for frequency diversity.
  • UL FMT UL feedback mini-tiles
  • each UL FMT is defined as 3 contiguous subcarriers by 6 OFDM symbols (3x6 for short), as shown in the FIG.
  • a PCIQCH logical channel occupies 3 UL feedback mini- tiles (UL FMT), which are chosen from different UL distributed control resource units for frequency diversity.
  • UL FMT UL feedback mini- tiles
  • each UL FMT is defined as 2 contiguous subcarriers by 6 OFDM symbols (2x6 for short), which is similar as 3x6. In all these 3 cases, same block size will be used, which is 6x6.
  • Distributed is illustrated at 210 and hopping localized at 220.
  • FIG. 3 at 300 is illustrated the PCQICH channel symbol generation procedure for
  • a 4-bits payload 310 is illustrated as an example herein, but the present invention is not limited in this respect. Sequence selection is provided at 320.
  • the 4-bits payload 310 is encoded to 16 bits by block code described in table 3 below then applied with repetition-2 330, when using tile size 2x6, the 4-bits payload 310 is encoded to 12 bits by semi-orthogonal sequence in table 1 and then applied with0 repetition-3. After that the repeated coded bits are BPSK modulated 340 and mapped to one UL FMT 350 and outputting feedback channel symbol 360. For each tile of 3x6 in
  • PCQICH two tones are null, as shown in FIG. 4 at 400, while for tile size 2x6, all tones are used for data transmission.
  • the tile structure of 6x6 can be derived5 in a similar way to that as provided in FIG. 1, or using the structure of SCQICH (described in below in reference to FIG. 5) for unified pilot pattern to reduce design complexity. This will not cause any performance difference.
  • the channel symbol generation procedure when using tile size of 6x6 will be also similar, except for just directly encoding the 4-bits payload into 32 bits to achieve more spreading gain. In this case, 2-times repetition will0 be skipped.
  • Non-coherent detection can be used for PCQICH detection as described below:
  • the received signal can be written as (1), where R j (n,k) stands for received signal at j-th antenna, H ' (n,k) stands for channel
  • N (n k) 5 response P 1 (n, k) stands for coded bits and J ' stands for while noise.
  • R J ⁇ n,k) H ] ⁇ n, k)P, ⁇ n, k) + N J (n, k)
  • non-coherent detection is used as described in the following:
  • the received signal can be written as
  • non-coherent detection is used as described in the following: For jth receiver antenna for tile 1 & 2 , the received signal can be written as
  • n stands for the tile index and equals to 1 or 2.
  • ⁇ on-coherent receiver the received signal is correlated with all kind of sequence shown in (5)
  • PCQICH Physical Uplink Control Channel
  • 4 ⁇ 6bits will a reasonable range for average feedback information in PCQICH since 4 bits is needed for effective SI ⁇ R while 1-2 bits is needed for rank adaptation for different MIMO mode.
  • the exact bits number for PCQICH will depends on specific wireless system and our design can be easily extended to different payload bits due to the block code based unified channel coding proposed in below support up to 12/24 bits.
  • the transmitter sends one of the predefined sequences over adjacent frequency subcarriers and adjacent OFDM symbols. Each entry of the sequence modulates one subcarrier. If the channel correlation is known to the receiver, it is possible to apply an advanced receiver in this section. The channel correlation for different subcarriers can be estimated from channel delay spread. The channel correlation for different OFDM symbols can be estimated from Doppler. The advanced receiver is especially helpful to overcome the error floor when direct cross correlation is applied when the correlation of two sub carriers located in different frequency and time becomes low, e.g. when the speed is high
  • the transmitter sends one of the predefined sequences over adjacent frequency subcarriers and adjacent OFDM symbols. Each entry of the sequence modulates one subcarrier.
  • the receiver wants to detect which of the predefined sequences was sent without estimating the channel response. Denote predefined sequences as
  • h(j) and n(j) are assumed to be zero mean and Gaussian distributed with variances 1 and ⁇ 2 , i.e. h(j) ⁇ CN ( ⁇ ,l) and n(j) ⁇ CN( ⁇ , ⁇ 2 ).
  • the channel responses are assumed unknown to the receiver but the correlations of the channel responses across subcarriers are assumed known. Namely, we have ,
  • n(j) and c t ⁇ j) are independent and
  • 1 , «(/ ' ) and ⁇ (j) has the same distribution.
  • the maximum likelihood detection of the transmitted sequence C 1 is given by:
  • conditional probability can be computed as
  • R r (R ⁇ ! + ⁇ l) 1 . If the correlation R is not known at the receiver, R can be estimated from the previous uplink traffic such as association request and ACK. Otherwise, the maximum a posterior (MAP) detector can be obtained from (14) by adding one more term as Where
  • the base station can obtain samples of R for estimating the distribution of R , i.e. P(R) and evaluate (18) numerically.
  • R may be parameterized by Doppler speed and only a few, e.g. 4 speeds are chosen for the evaluation of (18).
  • R of a speed say a medium or a high speed e.g. 100 km/h or 300 km/h, is used in (14) without incurring (17) and
  • R performs as a low pass filter on r c and the Doppler speed roughly control the highest pass frequency.
  • the exact R can be replaced by various low pass filters with small performance losses. For complexity reduction, some quantity can be pre-computed and stored. For example, r can be computed for different speeds beforehand.
  • tile size 3x6 one 6x6 block is constructed from 2 UL FMTs, which are chosen from different UL DRU(distributed resource unit).
  • An UL FMT is a time-frequency block of 3 contiguous subcarriers by 6 OFDM symbols and has 3 fixed-location pilot tones;
  • Tile size 2x6 one 6x6 block is constructed from 3 UL FMTs, which are chosen from different UL DRU(distributed resource unit).
  • An UL FMT is a time-frequency block of 2 contiguous subcarriers by 6 OFDM symbols and has 2 fixed-location pilot tones;
  • Tile size 6x6 has 4 fixed-location pilot tones
  • FIG. 5, generally at 500 shows the tile structure of different tile sizes mentioned above including 3x6 310, 6x6 320, and 2x6 330.
  • the process of composing the SCQICH and channel structure of uplink secondary fast feedback channel is shown in the FIG. 7 at 700.
  • each block UL enhanced feedback payload information bit (l ⁇ l lbits) is encoded 710 and 720 to either 30 bits length when using tile size 3x6 or tile size 2x6 (last 2 column are punctured) or 32 bits length when using tile size 6x6 by the block code described by table 3 and table 4 described in below.
  • the sequence is repeated by 2 times 730 and QPSK modulated 740.
  • the modulated symbols are mapped 750 to data subcarrier of the uplink enhanced fast feedback control channel. Secondary fast feedback channel symbol result shown at 760. Specificaly, the mapping from coded block to tile structure of 2x6 is shown in FIG. 6.
  • a control data payload of the SCQICH has variable size depending on the reporting format in which the combination of the feedback information is given. Each SCQICH can support feedback payload information bit size in the range of l ⁇ 12bits. In addition, rates can be adapted for different users based on its channel condition. The repetition can be skipped to support higher rate (up to 24 payload bits) in SCQICH.
  • the receiver detection of SCQICH channels will be coherent with MLD receiver. Channel coding for CQICH
  • Table 1 shows the semi-orthogonal sequence for PCQICH when using tile size 2x6.
  • the cross-correlation of these sequences are 6, 4, 2, 0. This can support transmitting up to 6 information bits, and the former 16 sequences can be used when transmitting 4bits, former 32 sequences when transmitting 5bits.
  • the information bits of CQICH are encoded by two separate of block codes.
  • the codeword can be obtained by linear combination of the 6 or 12 basis sequences denoted as Si, n in table 3 and table 4
  • Puncturing and repetition may be applied to the encoded codeword.
  • FIG. 8 at 800 illustrates the performance results of PCQICH as a SNR vs. PER curve of 4-bit PCQICH (PB- 3kmph and PA-3kmph) of tile size 3x6/6x6.
  • FIG. 9 at 900 is a SNR vs. PER curve of 4/5/6-bit PCQICH (PB-3kmph and VA-350kmph) of tile size 2x6.
  • FIG. 10 at 1000 shows a SNR vs. PER curve of 11 -bit SCQICH (PB- 3kmph, 1x2 and 1x4) and demonstrates the performance results of 1x2 and 1x4 under PB-3kmph when transmitting 11 bits payload with block size of 6x6.
  • tile size 3x6 is preferred in this case.
  • FIG. 11 at 1100 shows performance results of 1x2 under PB-3kmph and PA- 3kmph when transmitting 22 bits payload with block size of 6x6.
  • the results of tile size 6x6 outperforms tile size 3x6 about ⁇ 2dB under PB-3kmph and ⁇ 1.5dB under PA-3kmph.
  • tile size of 6x6 is be preferred compared with that of 3x6.
  • FIG. 12 at 1200 illustrates a SNR vs. PER curve of 12/24-bit SCQICH (PB-3kmph, 1x2, 1x4) with tile size 2x6 according to an embodiment of the present invention.

Abstract

Un mode de réalisation de la présente invention concerne un appareil, comportant un émetteur-récepteur à utiliser dans un réseau sans fil utilisant un concept de canal rapide d’informations en retour qui incorpore une structure de canal rapide d’informations en retour adaptatif à deux niveaux séparant des canaux rapides d’informations en retour de liaison montante en des canaux rapides, primaire et secondaire, d’informations en retour de liaison montante.
EP09824209A 2008-10-31 2009-10-31 Techniques de transmission de données sur la qualité de canaux dans des systèmes sans fil Withdrawn EP2361471A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US11054408P 2008-10-31 2008-10-31
US12/459,268 US8200165B2 (en) 2009-06-26 2009-06-26 Techniques for transmission of channel quality data in wireless systems
PCT/US2009/062906 WO2010051519A2 (fr) 2008-10-31 2009-10-31 Techniques de transmission de données sur la qualité de canaux dans des systèmes sans fil

Publications (1)

Publication Number Publication Date
EP2361471A2 true EP2361471A2 (fr) 2011-08-31

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EP (1) EP2361471A2 (fr)
JP (1) JP5265017B2 (fr)
KR (1) KR101248329B1 (fr)
CN (1) CN102308543B (fr)
WO (1) WO2010051519A2 (fr)

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Publication number Priority date Publication date Assignee Title
US8200165B2 (en) 2009-06-26 2012-06-12 Hongmei Sun Techniques for transmission of channel quality data in wireless systems
CN103931245A (zh) * 2012-03-27 2014-07-16 日电（中国）有限公司 用于无线通信系统中的外环链路自适应的方法和装置
US9930574B2 (en) * 2014-11-21 2018-03-27 Huawei Technologies Co., Ltd. System and method for link adaptation

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JP5288798B2 (ja) * 2004-08-17 2013-09-11 エルジー エレクトロニクス インコーポレイティド 無線通信システムで高速フィードバックチャネルを設定して情報を伝送する方法
EP1946472B1 (fr) * 2005-11-07 2017-03-01 Telefonaktiebolaget LM Ericsson (publ) Signalisation implicite pour adaptation de liaison
US7929962B2 (en) * 2006-05-01 2011-04-19 Alcatel-Lucent Usa Inc. Method for controlling radio communications during idle periods in a wireless system
US20080225792A1 (en) * 2007-03-12 2008-09-18 Qualcomm Incorporated Multiplexing of feedback channels in a wireless communication system

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WO2010051519A2 (fr) 2010-05-06
CN102308543B (zh) 2014-11-26
KR101248329B1 (ko) 2013-04-01
WO2010051519A3 (fr) 2010-07-22
KR20110107791A (ko) 2011-10-04
JP5265017B2 (ja) 2013-08-14
CN102308543A (zh) 2012-01-04
JP2012508480A (ja) 2012-04-05

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