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WO2013091215A1 - Procédés et appareil de gestion de rétroaction et de signalisation - Google Patents

Procédés et appareil de gestion de rétroaction et de signalisation Download PDF

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Publication number
WO2013091215A1
WO2013091215A1 PCT/CN2011/084440 CN2011084440W WO2013091215A1 WO 2013091215 A1 WO2013091215 A1 WO 2013091215A1 CN 2011084440 W CN2011084440 W CN 2011084440W WO 2013091215 A1 WO2013091215 A1 WO 2013091215A1
Authority
WO
WIPO (PCT)
Prior art keywords
nodes
point set
channel quality
coordinated multi
quality information
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.)
Ceased
Application number
PCT/CN2011/084440
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English (en)
Inventor
Jianchi Zhu
Kodo Shu
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.)
Nokia Inc
Original Assignee
Nokia Inc
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
Application filed by Nokia Inc filed Critical Nokia Inc
Priority to PCT/CN2011/084440 priority Critical patent/WO2013091215A1/fr
Publication of WO2013091215A1 publication Critical patent/WO2013091215A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04L1/0026—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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0076—Distributed coding, e.g. network coding, involving channel coding
    • H04L1/0077—Cooperative coding
    • 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
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H04L1/203—Details of error rate determination, e.g. BER, FER or WER
    • 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
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • 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
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding

Definitions

  • the present invention relates generally to wireless communication. More particularly, the invention relates to systems and techniques for improved management of resource allocation among neighboring network nodes.
  • a wireless network deployment supported a cell encompassing a relatively large geographic area, with a large base station located in a central area serving user devices distributed through the cell.
  • a cell was historically dedicated to the user devices within its geographic area, with all user devices attached to the cell being served by that base station.
  • Base stations serving such areas may lie in the same geographic area as that encompassed by a traditional base station, and may serve selected sets of users who may include users separate from those served by the traditional base station or may include a portion of users served by the traditional base station.
  • a cell may suitably be thought of as a geographic area served by a base station, and a base station or other device providing service may be thought of as a node.
  • a network may comprise a collection of nodes, with each node typically serving its own cell. Different cells may overlap, particularly those served by nodes operating at different power levels.
  • an apparatus comprises memory, at least one processor, and a program of instructions configured to, with the memory and the at least one processor, cause the apparatus to perform actions comprising at least receiving channel quality information feedback from at least one user equipment reflecting channel quality information based on one or more states of a coordinated multi-point set of nodes of a wireless
  • a state of the coordinated multi-point set is a combination of nodes using normal subframes and nodes using almost blank subframes.
  • the actions further comprise deriving channel quality information at the apparatus for each possible state of the coordinated multi-point set.
  • an apparatus comprises memory, at least one processor, and a program of instructions configured to, with the memory and the at least one processor, cause the apparatus to perform actions comprising at least receiving information relating to configuration of almost blank subframes in nodes of a coordinated multi-point set, performing channel state information measurements to determine interference experienced by the apparatus with respect to its own serving node and nodes of the coordinated multi-point set, calculating channel quality information based on the channel state information measurements and information relating to configuration of almost blank subframes, and providing channel quality information feedback to a serving node.
  • the channel quality information feedback comprises feedback relating to each of at least two different conditions.
  • the two conditions include at least two different states of configuration of almost blank subframes in nodes of the coordinated multipoint set.
  • a method comprises receiving channel quality information feedback from at least one user equipment reflecting channel quality information based on one or more states of a coordinated multi-point set of nodes of a wireless communication network.
  • T state of the coordinated multi-point set is a combination of nodes using normal subframes and nodes using almost blank subframes.
  • the method further comprises deriving channel quality information at the apparatus for each possible state of the coordinated multi-point set.
  • a computer readable medium stores a program of instructions which, when executed by a processor, configure an apparatus to perform actions comprising at least receiving channel quality information feedback from at least one user equipment reflecting channel quality information based on one or more states of a coordinated multi-point set of nodes of a wireless communication network.
  • a state of the coordinated multipoint set is a combination of nodes using normal subframes and nodes using almost blank subframes.
  • the actions further comprise deriving channel quality information at the apparatus for each possible state of the coordinated multi-point set.
  • Fig. 1 illustrates a wireless network according to an embodiment of the present invention
  • Fig. 2 illustrates a bitmap representing an actual almost blank subframe configuration according to an embodiment of the present invention
  • Figs. 3A and 3B illustrate bitmaps representing best and worst case almost blank subframe configurations according to an embodiment of the present invention
  • Fig. 4 illustrates a user equipment and a base station according to an embodiment of the present invention
  • Fig. 5 illustrates a process according to an embodiment of the present invention
  • Fig. 6 illustrates a process of CQI reliability testing according to an embodiment of the present invention.
  • Fig. 7 illustrates an alternative process of CQI reliability testing according to an embodiment of the present invention.
  • elCIC enhanced inter-cell interference coordination
  • a high power node such as a macro eNB
  • low power nodes such as pico eNBs
  • interference coordination is performed by means of a bitmap, with each bit in the bitmap being mapped to a single subframe.
  • the size of the bitmap is 40 bits, so that the interference pattern repeats itself after 40 ms. Based on data traffic demand, the pattern can change as often as every 40 ms.
  • Embodiments of the present invention recognize that the flexibility of semi-static elCIC is limited because the interference pattern can only be changed every 40ms. Improved elCIC techniques are being contemplated, notably dynamic elCIC, suitably also referred to as dynamic point blanking, which allows the interference pattern to be changed at each subframe.
  • a macro eNB using a dynamic interference pattern is therefore able to select a normal subframe or an almost blank subframe dynamically.
  • Each eNB in a network is able to dynamically change its use of subframes, such as between using a normal subframe and using an almost blank subframe.
  • multiple cells may jointly determine which cells are to be configured to use normal subframes and which cells are to be configured to use almost blank subframes.
  • Embodiments of the present invention recognize that in semi-static elCIC configurations, a UE is aware of the exact interference pattern in the next subframe, but in dynamic elCIC configurations, the UE has no such knowledge. For example, suppose that a coordinated multipoint, or CoMP, set, or coordination area encompasses a number "L" of cells. Each cell has two states: each state is a normal subframe state or an almost blank subframe state. A UE
  • Embodiments of the present invention provide efficient mechanisms for channel quality information (CQI) reporting for modulation and coding scheme (MCS) transmission, and for measurement by a UE in the face of dynamic on and off status of neighbor cells.
  • CQI channel quality information
  • MCS modulation and coding scheme
  • one or more UEs provides channel quality information for the best possible scenario and the worst possible scenario.
  • the best possible scenario is one in which all coordinated cells in a CoMP set are configured to use almost blank sub frames
  • the worst possible scenario is one in which all coordinated cells in the CoMP set are using normal subframes.
  • a serving node transmits a physical downlink shared channel (PDSCH) and assumes that the PDSCH of all coordinated frames in a CoMP set are off, or muted.
  • the worst case scenario is one in which the serving cell is transmitting PDSCH and the PDSCH of all coordinated cells in the CoMP set are on, that is, not muted.
  • “Muted” here means that only the data region is muted, which resource signaling, such as CRS and CSI-RS is still available.
  • Fig. 1 illustrates a wireless network 100 according to an embodiment of the present invention.
  • the network 100 comprises macro cells 102A-10C, with each of the cells 102A-102C comprising a geographic area served by a base station.
  • the base stations may be implemented as eNodeBs, or eNBs, 104A-104C.
  • user equipments, or UEs, 106A-106E are distributed through the network 100, and a low power eNB 108 supports a small cell 1 10 that neighbors the macro cell 102A.
  • the UEs 106A and 106B are served by the low power eNB 108 and the UEs 106C-106E are served by a coordinated multi-point set comprising the eNBs 104A-104C.
  • the operation of the eNBs 104A-104C presents interference to the low power eNB 108 as it serves the UEs 106A and 106B.
  • the eNBs 104A-104C perform interference coordination through the use of almost blank subframes, and this interference coordination may take the form of dynamic elCIC.
  • Each of the macro eNBs 104A-104C is able to select a normal subframe or an almost blank subframe for each subframe.
  • the coordination area of the macro eNBs 104A-104C may be changed semi-statically, and information defining the coordination area may be provided to affected UEs through radio resource control signaling.
  • the affected UEs are the UEs 106A-106E.
  • each of the affected UEs provides best case CQI and worst case CQI to its serving cell, and the serving cell derives the CQI for all states based on the CQI information fed back from the one or more UEs to their serving cells, as well as the pathloss, suitably estimated through sounding reference signals.
  • signaling using a physical uplink shared channel (PUSCH) and physical uplink control channel (PUCCH) can be used to estimate pathloss.
  • PUSCH physical uplink shared channel
  • PUCCH physical uplink control channel
  • the UEs 106A and 106B provide best case CQI and worst case CQI to the serving cell 108.
  • the serving cell derives CQI for all states based on fed back CQI values and estimated pathloss through sounding reference signals (SRS) or other appropriate signaling.
  • SRS sounding reference signals
  • Almost blank subframe information is information indicating to the UE which eNBs in the CoMP set are using normal subframes and which are using almost blank subframes.
  • Signaling may be performed, for example, using radio resource control (RRC) signaling or LI signaling.
  • RRC radio resource control
  • CSI measurements are performed based on common reference signaling (CRS) or channel state information reference signals (CSI-RS).
  • CRS common reference signaling
  • CSI-RS channel state information reference signals
  • the signaling used may be RRC signaling, in which a UE's serving eNB provides the UE with the history information with respect to almost blank subframes for each cell in the CoMP set.
  • the eNB 108A would provide the UEs 106A and 106B with history information with respect to almost blank subframes for the CoMP set 104A-104C.
  • the history information is the information, for each cell in the time window, as to how many subframes are almost blank subframes and how many subframes are normal subframes.
  • an expression T may be used for the number of normal subframes for cell i, so that T - , would be the number of almost blank subframes for cell in the time window.
  • LI control signaling is used.
  • An almost blank subframe pattern which can be dynamically changed, may be used, and notified to the UEs through LI control signaling.
  • a single bitmap is used, where each bit in the bitmap is mapped to one cell.
  • An exemplary bitmap 200 is illustrated in Fig. 2.
  • the bitmap 200 comprises fields 202A-202H, with each of the fields 202A-202H being associated with an eNB.
  • the eNBs associated with the fields 202A, 202C, and 202F-202H are configured to use almost blank subframes and the eNBs associated with the fields 202B, 202D, and 202E are configured to use normal subframes.
  • channel state information measurements may be taken.
  • two values may be defined, namely:
  • Signal strength in the CoMP set may be measured based on:
  • CSI-RS ⁇ * Pu, where ⁇ is transmission power and Pu is pathloss between cell
  • ICI measurement can be based on CRS or CSI-RS.
  • CSI-RS Physical downlink shared channel (PDSCH) muting is adopted in the CoMP set to keep CSI-RS of different cells orthogonal, P O U TIC I can be obtained. Then Pici can be calculated as follows:
  • PICI POUTICI + ⁇ ( PT* PLi).
  • Pi ,t is the measured ICI in time slot t and ICI Pi is time averaged in time window T.
  • the UE can calculate POUTICI and ⁇ ⁇ :
  • L is the number of cells in the CoMP set
  • T is the length of time window
  • Tj is the number of normal subframes for cell i
  • T - Tj is the number of almost blank subframes.
  • ICI Pi may be measured based on a real almost blank subframe pattern, such as the exemplary pattern illustrated in Fig. 2 and discussed above.
  • the UE may use an assumed almost blank subframe pattern, which is a virtual pattern used for CQI calculation.
  • Inter-cell interference expected from the CoMP set may be calculated based on Pi and the ABS pattern:
  • bj 0 or 1 according to a real ABS pattern
  • the cell / cannot be the serving cell of the UE for which the CQI is being determined. That is, the value of the index / for the serving cell is excluded from the computation.
  • Fig. 3A illustrates an assumed almost blank subframe pattern 300, including fields 302A- 302H, with all of the fields 302A-302H being set to 0 to illustrate that the complete CoMP set is configured to use almost blank subframes.
  • the pattern 300 represents a best case condition.
  • Fig. 3 B also illustrates an assumed almost blank subframe pattern 350, including fields 352A-352H, with all of the fields 352A-352H being set to 1 to illustrate that the complete CoMP set is configured to use normal.
  • the pattern 350 represents a worst case condition.
  • POUTICI is calculated based on an assumed almost blank subframe pattern comprising this best-case scenario.
  • Pic / is calculated based on an assumed almost blank subframe pattern comprising the worst-case scenario; that is, where the CoMP set comprises exclusively normal subframes.
  • PL is pathloss and POUTICI i inter-cell interference outside of the coordination area. That is, that is, POUTICI is the inter-cell interference produced by the eNBs participating in the CoMP set and affecting cells, such as the cell 1 10, outside the CoMP coverage area.
  • Pici is inter-cell interference produced by the serving cell
  • the pathloss is estimated between each cell i and the UE providing the CQI, suitably through SRS or other appropriate signaling: PLj
  • the CQI n of state n is calculated as follows: After all CQI values of the state are obtained, joint scheduling can be implemented in the
  • CoMP set From the perspective of each of the eNBs 104A-104C, 2 1' 1 states can be perceived. For each state n, cells assigned for normal subframe operations will perform scheduling. Sum weighted throughput Thr n in the CoMP set is calculated. The CoMP set is configured to the state that yields the largest sum weighted throughput.
  • PL is the pathloss between a serving cell and a UE being served by that cell.
  • PL turns to be PL for that UE.
  • Fig. 4 illustrates additional details of the UE 106A and the eNB 104A, with the eNB 104A serving as a representative example of the nodes of the CoMP set.
  • the UE 106 A suitably comprises a transmitter 402, receiver 404, radiocontroller 406, and antenna 408.
  • the UE 106A further suitably comprises a processor 410, memory 412, and storage 414, communicating with one another and with the radiocontroller over a bus 416.
  • the UE 106A suitably further employs data 418 and programs 420, residing in storage 414.
  • the eNB 104A suitably comprises a transmitter 442, receiver 444, radiocontroller 446, and antenna 448.
  • the macro eNB 108 further suitably comprises a processor 450, memory 452, and storage 454, communicating with one another and with the radiocontroller over a bus 456.
  • the macro eNB 1 18 also suitably employs data 458 and programs 460, residing in storage 454.
  • the UE 106A may suitably receive ABS information through radio resource control signaling or LI control signaling, as described above, and may store the ABS information as part of the data 418.
  • the UE 106A may implement a channel state information determination module 462, suitably implemented as part of the programs 420, and a CQI determination and feedback module 464.
  • the CQI determination and feedback module 464 suitably computes CQI values and transmits a report to its serving eNB. In the case of the UE 106A, this is the eNB 108.
  • the CQI may be computed based on actual ABS information or may alternatively be computed based on virtual ABS information representing best case and worst case scenarios as described above.
  • the eNB 104A performs CQI derivation based on information collected by UEs and relayed to the eNB 104A by the serving eNB of the UE collecting the channel information. For example, CQI information collected by the UE 106A may be relayed to the eNB 104A by the eNB 108. CQI derivation may suitably be accomplished by a CQI derivation module 470.
  • the eNB 104A may also implement a scheduling module 472, to schedule the use of normal or almost blank sub frames by itself and other nodes of the CoMP set. Scheduling for the set may be performed by any of the eNBs
  • Fig. 5 illustrates a process 500 according to an embodiment of the present invention.
  • the process 500 may be carried out by one or more of an eNB such as the eNBs 104A-104C, the eNB 108, and UEs such as the UEs 106A-106E.
  • eNB such as the eNBs 104A-104C
  • eNB 108 such as the UEs 106A-106E.
  • almost blank subframe information is provided to UEs using appropriate signaling.
  • Such signaling may take the form, for example of radio resource signaling or LI signaling.
  • channel state information estimation is performed by UEs, suitably based on common reference signaling or channel state information reference signals.
  • UEs calculate best and worst case CQI.
  • Best case CQI for a UE is the CQI experienced by the UE when all eNBs of a CoMP set in its vicinity are using almost blank subframes
  • worst case scenario for a UE is the CQI experienced by the UE when all the eNBs of a CoMP set in its vicinity are using normal subframes.
  • each UE computing CQI provides CQI feedback to a suitable recipient, such as its serving eNB.
  • the eNBs belonging to the CoMP set perform CQI derivation.
  • scheduling is performed for the eNBs belonging to the CoMP multipoint set, suitably to provide the best overall weighted throughput, by scheduling use by the nodes of the CoMP multipoint set of normal or almost blank subframes.
  • Fig. 6 illustrates a process 600 of CQI testing according to one or more embodiments of the present invention, suitably employed to test the reliability of the best and worst case CQI values, for CSI-RS with muting based interference measurement.
  • the data regions, that is, PDSCH, of all coordinated nodes are configured OFF.
  • a UE such as the UE 106A, performs channel and interference measurement and calculates the best CQI in ways noted above, and provides values for the best CQI as feedback to an eNB.
  • the eNB uses the best CQI fed back on the channel used by the UE as the best CQI.
  • the UE performs decoding.
  • the error rate is evaluated, that is, the difference between the CQI fed back from the UE and the CQI calculated by the UE. In one exemplary embodiment, a desired block error rate is below 10%.
  • step 612 in order to test the worst case CQI, all the data regions, that is, PDSCH, of all coordinated nodes in the CoMP set are configured ON.
  • the UE performs channel and interference measurement, calculates the worst CQI using techniques discussed above, and provides feedback for the worst case CQI.
  • the eNB uses the worst CQI fed back on the channel used by the UE as the worst CQI.
  • the UE performs decoding.
  • the error rate is evaluated, that is, the difference between the CQI fed back from the UE and the CQI calculated by the UE. In one exemplary embodiment, a desired block error rate is below 10%.
  • Fig. 7 illustrates a process 700 of CQI reliability evaluation based on CRS-RS based interference measurement.
  • the interference measurement for CQI depends on PDSCH transmission in coordinated cells. Therefore, a configuration in which the data region of several coordinated cells is on, while others are off, is used for the best and worst case CQI.
  • the real on and off configurations, as known or set by the eNB, which aligns with the definitions of the best and worst case CQIs is used to test the feedback CQI.
  • PDSCH coordinated cells' data region
  • the UE performs channel and interference measurement, calculates best CQI using techniques such as those discussed above, and provides the calculated measurement to an eNB as feedback of the best case CQI.
  • the eNB uses the best CQI fed back on the channel used by the UE as the best CQI.
  • the UE performs decoding.
  • the error rate is evaluated, that is, the difference between the CQI fed back from the UE and the CQI calculated by the UE. In one exemplary embodiment, a desired block error rate is below 10%.
  • the UE does channel and interference measurement, calculates worst case CQI using techniques such as those discussed above, and provides the calculated measurement to an eNB as feedback of the worst case CQI.
  • the UE performs decoding.
  • the error rate is evaluated, that is, the difference between the CQI fed back from the UE and the CQI calculated by the UE. In one exemplary embodiment, a desired block error rate is below 10%.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne des systèmes et des techniques pour gérer une gestion de rétroaction et de signalisation dans un réseau sans fil. Des équipements utilisateur (UE) appartenant à un réseau comportent des informations de sous-trame presque vide et fournissent des informations de rétroaction de qualité de canal à des stations de base. Les informations de qualité de canal peuvent être des informations de qualité de canal calculée dans le meilleur cas et le pire cas. Une station de base recevant une rétroaction d'informations de qualité de canal réalise une dérivation d'informations de qualité de canal pour chaque cas possible définissant une configuration de sous-trames presque vides par des nœuds d'un ensemble multipoint coordonné. Une configuration de sous-trames presque vides ou de sous-trames normales peut être planifiée pour l'ensemble en choisissant le cas qui rend maximal le débit pondéré global.
PCT/CN2011/084440 2011-12-22 2011-12-22 Procédés et appareil de gestion de rétroaction et de signalisation Ceased WO2013091215A1 (fr)

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CN101841386A (zh) * 2009-03-20 2010-09-22 中兴通讯股份有限公司 一种信道质量指示的反馈方法及系统
CN101986586A (zh) * 2010-11-09 2011-03-16 中兴通讯股份有限公司 一种信道质量测量反馈方法及用户设备
CN101997587A (zh) * 2009-08-14 2011-03-30 中兴通讯股份有限公司 多点协作传输中的cqi值确定方法及装置
US20110170435A1 (en) * 2010-01-12 2011-07-14 Samsung Electronics Co. Ltd. Method for processing csi-rs in wireless communication system
WO2011103476A1 (fr) * 2010-02-19 2011-08-25 Qualcomm Incorporated Calcul de retour d'informations d'état de canal dans systèmes utilisant annulation de brouillage à signal de référence commun
CN102177670A (zh) * 2008-10-10 2011-09-07 高通股份有限公司 无线通信系统中用于进行信道反馈的方法和装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102177670A (zh) * 2008-10-10 2011-09-07 高通股份有限公司 无线通信系统中用于进行信道反馈的方法和装置
CN101841386A (zh) * 2009-03-20 2010-09-22 中兴通讯股份有限公司 一种信道质量指示的反馈方法及系统
CN101997587A (zh) * 2009-08-14 2011-03-30 中兴通讯股份有限公司 多点协作传输中的cqi值确定方法及装置
US20110170435A1 (en) * 2010-01-12 2011-07-14 Samsung Electronics Co. Ltd. Method for processing csi-rs in wireless communication system
WO2011103476A1 (fr) * 2010-02-19 2011-08-25 Qualcomm Incorporated Calcul de retour d'informations d'état de canal dans systèmes utilisant annulation de brouillage à signal de référence commun
CN101986586A (zh) * 2010-11-09 2011-03-16 中兴通讯股份有限公司 一种信道质量测量反馈方法及用户设备

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