WO2013140782A1 - Procédé de renvoi d'indicateur de qualité de canal et équipement utilisateur - Google Patents

Procédé de renvoi d'indicateur de qualité de canal et équipement utilisateur Download PDF

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WO2013140782A1
WO2013140782A1 PCT/JP2013/001845 JP2013001845W WO2013140782A1 WO 2013140782 A1 WO2013140782 A1 WO 2013140782A1 JP 2013001845 W JP2013001845 W JP 2013001845W WO 2013140782 A1 WO2013140782 A1 WO 2013140782A1
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band
sub
cqi
predefined sub
bands
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Ziyuan GUO
Ming Ding
Lei Huang
Renmao Liu
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Sharp Kabushiki Kaisha
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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
    • H04L1/0028—Formatting
    • H04L1/0029—Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling
    • 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
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0658—Feedback reduction
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0658—Feedback reduction
    • H04B7/066—Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM]
    • 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
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • 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
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • 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
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • 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
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • 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
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • 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
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • 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
    • H04L5/0057—Physical resource allocation for CQI

Definitions

  • the invention relates to communication technology field, and more particularly, to a channel quality indicator feedback method in a Coordinated MultiPoint(CoMP) and a User Equipment (UE) applying the same.
  • CoMP Coordinated MultiPoint
  • UE User Equipment
  • Multi-antenna wireless transmission technique can achieve spatial multiplex gain and spatial diversity gain by deploying a plurality of antennas at both the transmitter and the receiver and utilizing the spatial resources in wireless transmission.
  • MIMO Multiple Input Multiple Output
  • Fig. 1 shows a schematic diagram of a MIMO system. As shown in Fig. 1, a plurality of antennas at the transmitter and a plurality of antennas at each of the receivers constitute a multi-antenna wireless channel containing spatial domain information.
  • Orthogonal Frequency Division Multiplexing (OFDM) technique has a strong anti-fading capability and high frequency utilization and is thus suitable for high-rate data transmission in a multi-path and fading environment.
  • the MIMO-OFDM technique in which MIMO and OFDM are combined, has become a core technique for a new generation of mobile communication.
  • the 3 rd Generation Partnership Project (3GPP) organization is an international organization in mobile communication field and plays an important role in standardization of 3G cellular communication technologies. Since the second half of the year 2004, the 3GPP organization has initiated a so-called Long Term Evolution (LTE) project for designing Evolved Universal Terrestrial Radio Access (EUTRA) and Evolved Universal Terrestrial Radio Access Network (EUTRAN).
  • LTE Long Term Evolution
  • EUTRA Evolved Universal Terrestrial Radio Access
  • EUTRAN Evolved Universal Terrestrial Radio Access Network
  • the MIMO-OFDM technique is employed in the downlink of the LTE system.
  • LTE-A systems the standardization of 4G cellular communication systems
  • multi-antenna multi-BS coordination gets extensive attention and support. Its core idea is that multiple BSs can provide communication services for one or more UEs simultaneously, so as to improve data transmission rate for a UE located at the edge of a cell.
  • a UE In a multi-antenna multi-BS service, a UE needs to report channel state/statistical information of a link between the UE and each BS/cell in a set of cells. This set of cells is referred to as a measurement set for multi-antenna multi-BS transmission.
  • the set of BSs/cells for which the UE actually perform information feedback can be a subset of the measurement set and is referred to as a coordination set for multi-antenna multi-BS transmission.
  • the coordination set for multi-antenna multi-BS transmission can be the same as the measurement set for multi-antenna multi-BS transmission.
  • a BS/cell in the coordination set for multi-antenna multi-BS transmission participates in Physical Downlink Shared Channel (PDSCH) transmission for the UE, either directly or indirectly.
  • PDSCH Physical Downlink Shared Channel
  • JP Joint Processing
  • the JP scheme needs to share PDSCH signal of the UE among the multiple BSs participating the coordination and can be divided into two approaches.
  • One is referred to as Joint Transmission (JT) in which the multiples BSs transmit their PDSCH signals to the UE simultaneously.
  • the other one is referred to as Dynamic Cell Selection (DCS) in which at any time instance, only one of the BSs which has the strongest signal link is selected to transmit its PDSCH signal to the UE.
  • JT Joint Transmission
  • DCS Dynamic Cell Selection
  • CB/CS Coordinated Beamforming/Coordinated Scheduling
  • information feedback is mainly carried out separately for each BS and is transmitted over the uplink resources of the serving BS.
  • information feedback refers to a process in which a UE needs to feed back CSI to a BS such that the BS can perform corresponding operations such as radio resource management.
  • CSI feedback approaches There are primarily the following three CSI feedback approaches in the prior art documents.
  • the UE quantizes all elements in a transceiver channel matrix and feeds back each of the elements to the BS.
  • the UE can analog modulate all elements in the transceiver channel matrix and feeds back them to the BS.
  • the UE can obtain an instantaneous covariance matrix for the transceiver channel matrix, quantizes all elements in the covariance matrix and feeds back each of the elements to the BS.
  • the BS can reconstruct an accurate channel from the channel quantization information fed back from the UE.
  • This approach is described in Non Patent Literature 2: 3GPP R1-093720, "CoMP email summary", Qualcomm and its implementation is illustrated in Fig. 2.
  • the UE applies a statistical process on a transceiver channel matrix, e.g., calculating a covariance matrix thereof, quantizes the statistical information and then feeds back it to the BS.
  • the BS can obtain statistical state information of the channel based on the feedback from the UE.
  • This approach is described in Non Patent Literature 2: 3GPP R1-093720, "CoMP email summary", Qualcomm and its implementation is illustrated in Fig. 3.
  • a finite set of CSI is predefined by the UE and the BS (i.e., codebook space, a typical codebook space includes channel rank and/or pre-coding matrix and/or channel quality indication, etc.).
  • the UE Upon detection of a transceiver channel matrix, the UE searches in the codebook space for an element best matching the CSI of the current channel matrix and feeds back the index of the element to the BS.
  • the BS looks up the predefined codebook space based on the index to obtain rough CSI.
  • Non Patent Literature 3 3GPP, R1-083546, "Per-cell precoding methods for downlink joint processing CoMP", ETRI, and its implementation is illustrated in Fig. 4.
  • the complete CSI feedback has the best performance, but is impractical to be applied to actual systems due to the highest feedback overhead.
  • its feedback overhead grows in proportional to the increase of the number of BSs and it is even more impractical.
  • the CSI feedback based on codebook space search has the lowest feedback overhead, but is worst in terms of performance since it cannot accurately describe the channel state such that the transmitter cannot make full use of channel characteristics and cannot perform the transmission accordingly.
  • it is extremely simple to implement and can typically accomplish feedback with a few bits.
  • the statistic-based CSI feedback achieves a good tradeoff between these two approaches.
  • this approach can accurately describe the channel state with a relatively small amount of feedback, thereby achieving a relatively ideal performance.
  • the CSI feedback based on codebook space search is employed in a single cell transmission mode.
  • this CSI feedback based on codebook space search will continue to be used.
  • the PUCCH Physical Uplink Control CHannel
  • PUSCH Physical Uplink Shared CHannel
  • the PUCCH is configured for transmission of synchronized, basic CSI with low payload; while PUSCH is configured for transmission of bursty, extended CSI with high payload.
  • a complete CSI is composed of different feedback contents which are transmitted in different sub-frames.
  • PUSCH on the other hand, a complete CSI is transmitted within one sub-frame.
  • the feedback contents can be divided into three categories: Channel Quality Indicator (CQI), Pre-coding Matrix Index (PMI) and Rand Index (RI), all of which are bit quantized feedbacks.
  • CQI typically corresponds to a transmission format having a packet error rate no more than 0.1.
  • TM MIMO Transmission Mode
  • Multi-user MIMO There are multiple UEs simultaneously participating in the downlink communication of the MIMO system.
  • Beam forming transmission The beam forming technique is employed in the MIMO system.
  • a dedicated reference signal is used for data demodulation at UE. Only one single layer of data is transmitted using the MIMO system.
  • the PMI feedback from UE is not required.
  • the UE can be configured to feed back PMI and RI, or not to feed back PMI and RI.
  • the above eight types of transmission modes may be retained and/or canceled, and/or a new transmission mode, dynamic MIMO switching, can be added, by which the BS can dynamically adjust the MIMO mode in which the UE operates.
  • Each MIMO transmission mode corresponds to a number of CSI feedback modes, as detailed in the following.
  • Mode 1-0 There are four CSI feedback modes for the PUCCH, Mode 1-0, Mode 1-1, Mode 2-0 and Mode 2-1. These modes are combination of four types of feedbacks, including:
  • Type 1 one preferred sub-band location in a Band Part (BP, which is a subset of the Set S and has its size dependent on the size of the Set S) and a CQI for the sub-band.
  • the respective overheads are L bits for the sub-band location, 4 bits for the CQI of the first codeword and 3 bits for the CQI of the possible second codeword which is differentially coded with respect to the CQI of the first codeword.
  • Type 2 broadband CQI and PMI.
  • the respective overheads are 4 bits for the CQI of the first codeword, 3 bits for the CQI of the possible second codeword which is differentially coded with respect to the CQI of the first codeword and 1, 2 or 4 bits for PMI depending on the antenna configuration at BS.
  • Type 3 RI.
  • the overhead for RI is 1 bit for two antennas, or 2 bits for four antennas, depending on the antenna configuration at BS.
  • Type 4 broadband CQI.
  • the overhead is constantly 4 bits.
  • the UE feeds back different information to the BS in correspondence with the above different types.
  • the Mode 1-0 is a combination of Type 3 and Type 4. That is, the feedbacks of Type 3 and Type 4 are carried out at different periods and/or with different sub-frame offsets.
  • the broadband CQI of the first codeword in the Set S and possibly the RI information are fed back.
  • the Mode 1-1 is a combination of Type 3 and Type 2. That is, the feedbacks of Type 3 and Type 2 are carried out at different periods and/or with different sub-frame offsets.
  • the broadband PMI of the Set S, the broadband CQIs for the individual code words and possibly the RI information are fed back.
  • the Mode 2-0 is a combination of Type 3, Type 4 and Type 1. That is, the feedbacks of Type 3, Type 4 and Type 1 are carried out at different periods and/or with different sub-frame offsets.
  • the broadband CQI of the first codeword in the Set S, possibly the RI information as well as one preferred sub-band location in the BP and the CQI for the sub-band are fed back.
  • the Mode 2-1 is a combination of Type 3, Type 2 and Type 1. That is, the feedbacks of Type 3, Type 2 and Type1 are carried out at different periods and/or with different sub-frame offsets.
  • the broadband PMI of the Set S, the broadband CQIs for the individual codewords and possibly the RI information, as well as one preferred sub-band location in the BP and the CQI for the sub-band are fed back.
  • MIMO TM 1) Mode 1-0 and Mode 2-0
  • MIMO TM 2) Mode 1-0 and Mode 2-0
  • MIMO TM 3) Mode 1-0 and Mode 2-0
  • MIMO TM 4) Mode 1-1 and Mode 2-1
  • MIMO TM 5) Mode 1-1 and Mode 2-1
  • MIMO TM 6) Mode 1-1 and Mode 2-1
  • MIMO TM 7) Mode 1-0 and Mode 2-0
  • CQI, PMI and RI are primary feedback contents in the single BS TM of the LTE-A system.
  • the Mode 1-1 and Mode 2-1 in the LTE-A system are optimized for a scenario where a BS is equipped with 8 transmission antennas. That is, a PMI is collectively determined from two channel pre-coding matrix indices, W1 and W2, where W1 represents broadband/long-term channel characteristics and W2 represents sub-band/short-term channel characteristics.
  • W1 and W2 represents broadband/long-term channel characteristics
  • W2 represents sub-band/short-term channel characteristics.
  • Mode 1-1 can be sub-divided into two sub-modes: sub-mode 1 of sub-mode 2 of Mode 1-1.
  • Type 1a one preferred sub-band location in a Band Part (BP, which is a subset of the Set S and has its size dependent on the size of the Set S) and a CQI for the sub-band, plus a W2 for another sub-band.
  • the overhead for the sub-band location is L bits.
  • Type 2a W1.
  • Type 2b broadband W2 and broadband CQI.
  • Type 2c broadband CQI, W1 and broadband W2.
  • Type 5 RI and W1.
  • the total overhead for the RI and the W1 is 4 bits for 8 antennas and 2-layer data multiplexing and 5 bits for 8 antennas and 4 or 8-layer data multiplexing. It is to be noted that, in order to control feedback overhead, the value range of the W1 here is obtained by down-sampling the full value range of the W1.
  • Type 6 RI and PTI.
  • PTI stands for Pre-coding Type Indicator and has an overhead of 1 bit for representing information on pre-coding type.
  • the total overhead for the RI and the PTI is 2 bits for 8 antennas and 2-layer data multiplexing, 3 bits for 8 antennas and 4-layer data multiplexing, and 4 bits for 8 antennas and 8-layer data multiplexing.
  • W1 and W2 when used alone refer to “sub-band W1" and “sub-band W2” respectively, while “wideband W1” and “wideband W2” are referred to by their full expressions.
  • Sub-Mode 1 of Mode 1-1 has the following relationship with the existing types and these new types:
  • the Sub-Mode 1 of Mode 1-1 is a combination of Type 5 and Type 2b. That is, the feedbacks of Type 5 and Type 2b are carried out at different periods and/or with different sub-frame offsets.
  • the Sub-Mode 2 of Mode 1-1 is a combination of Type 3 and Type 2/2c.
  • the Sub-Mode 2 of Mode 1-1 is a combination of Type 3 and Type 2. That is, the feedbacks of Type 3 and Type 2 are carried out at different periods and/or with different sub-frame offsets.
  • the Sub-Mode 2 of Mode 1-1 is a combination of Type 3 and Type 2c. That is, the feedbacks of Type 3 and Type 2c are carried out at different periods and/or with different sub-frame offsets.
  • the new Mode 2-1 relates to TM 9) only and is a combination of Type 6, Type 2b and Type 2a/1a.
  • the new Mode 2-1 is a combination of Type 6, Type 2b and Type 2a. That is, the feedbacks of Type 6, Type 2b and Type 2a are carried out at different periods and/or with different sub-frame offsets.
  • the new Mode 2-1 is a combination of Type 6, Type 2b and Type 1a. That is, the feedbacks of Type 6, Type 2b and Type 1a are carried out at different periods and/or with different sub-frame offsets.
  • Non Patent Literature 4 3GPP R1-113276, LGE, "CQI calculation for CoMP” (a 3GPP document numbered as R1-113276, "CQI calculation for CoMP", LGE corporation).
  • a signal power of a i th BS obtained by the UE measuring a reference signal is S i
  • the measured noise power of the UE is and a CQI fed back to the i th BS is CQI i
  • the feedback content is based on a form of separately feeding back CSI to each BS and is supplemented by feeding back relative CSI (e.g., phase information and the like) between BSs, so as to dynamically support JT, DPS, CS/CB and the like operations in a unified framework of CSI feedback.
  • the feedback schemes need to contain at least one of the first three approaches as follows:
  • CSI feedback per CSI reference signal which also feeds back relative CSI among different CSI reference signals; CSI feedback per CSI reference signal; CSI feedback based on Release 8 CRS reference signal per cell.
  • feedback contents may involve CSI based on codebook space search, such as CQI, PMI, RI. Studies are still needed for the definition and feedback schemes of CQI.
  • NPL 1 3GPP TR 36.814 V9.0.0 (2010-03), "Further advancements for E-UTRA physical layer aspects (Release 9) ".
  • NPL 2 3GPP R1-093720, "CoMP email summary", Qualcomm.
  • NPL 3 3GPP, R1-083546, "Per-cell precoding methods for downlink joint processing CoMP", ETRI.
  • NPL 4 3GPP R1-113276, LGE, "CQI calculation for CoMP”.
  • NPL 5 RAN1 Chairman's Note, 3GPP TSG RAN WG1 Meeting #66bis, Zhuhai, China, Oct, 2011.
  • a User Equipment comprises: a coordinated Base Station (BS) set determining unit, configured to determine a set of coordinated BSs participating in multi-BS coordination, the set of coordinated BSs containing a serving BS and non-serving BSs; and a Channel Quality Indicator (CQI) feedback unit, configured to feed back, for one predefined sub-band or each predefined sub-band of multiple predefined sub-bands, a difference between a CQI of non-coherent joint transmission and a common CQI value obtained by the UE to the serving BS.
  • BS Base Station
  • CQI Channel Quality Indicator
  • a Channel Quality Indicator (CQI) feedback method comprises: determining a set of coordinated BSs participating in multi-BS coordination, the set of coordinated BSs containing a serving BS and non-serving BSs; and feeding back, for one predefined sub-band or each predefined sub-band of multiple predefined sub-bands, a difference between a CQI of non-coherent joint transmission and a common CQI value obtained by a User Equipment (UE) to the serving BS.
  • UE User Equipment
  • the CQI feedback method and the UE provided for the multi-BS coordination mode according to the present invention have the advantages of simple implementation and low signaling overhead.
  • Fig. 1 is a schematic diagram of a MIMO system
  • Fig. 2 is a schematic diagram of complete CSI feedback
  • Fig. 3 is a schematic diagram of statistic-based CSI feedback
  • Fig. 4 is a schematic diagram of CSI feedback based on codebook space search
  • Fig. 5 is a schematic diagram of a multi-cell cellular communication system
  • Fig. 6 is a flowchart illustrating the CQI feedback method according to the present invention
  • Fig. 7 is a schematic block diagram of a UE according to the present invention.
  • Fig. 5 is a schematic diagram of a multi-cell cellular communication system.
  • the cellular system divides a service coverage area into a number of adjacent wireless coverage areas, i.e., cells.
  • the entire service area is formed by cells 100, 102 and 104, each being illustratively shown as a hexagon.
  • Base Stations (BSs) 200, 202 and 204 are associated with the cells 100, 102 and 104, respectively.
  • each of the BSs 200-204 includes at least a transmitter and a receiver.
  • a BS which is generally a serving node in a cell
  • each of the BSs 200-204 is located in a particular area of the corresponding one of the cells 100-104 and is equipped with an omni-directional antenna.
  • each of the BSs 200-204 can also be equipped with a directional antenna for directionally covering a partial area of the corresponding one of the cells 100-104, which is commonly referred to as a sector.
  • a directional antenna for directionally covering a partial area of the corresponding one of the cells 100-104, which is commonly referred to as a sector.
  • the BSs 200-204 are connected with each other via X2 interfaces 300, 302 and 304.
  • a three-layer node network architecture including base station, radio network control unit and core network is simplified into a two-layer node architecture in which the function of the radio network control unit is assigned to the base station and a wired interface named "X2" is defined for coordination and communication between base stations.
  • the BSs 200-204 are also connected with each other via air interfaces, A1 interfaces, 310, 312 and 314.
  • A1 interfaces A1 interfaces
  • Relay nodes are connected with each other via wireless interfaces and a base station can be considered as a special relay node.
  • a wireless interface named "A1" can then be used for coordination and communication between base stations.
  • an upper layer entity 220 of the BSs 200-204 is also shown in Fig. 5, which can be a gateway or another network entity such as mobility management entity.
  • the upper layer entity 220 is connected to the BSs 200-204 via S1 interfaces 320, 322 and 324, respectively.
  • S1 a wired interface named "S1" is defined for coordination and communication between the upper layer entity and the base station.
  • a number of User Equipments (UEs) 400-430 are distributed over the cells 100-104, as shown in Fig. 5.
  • each of the UEs 400-430 includes a transmitter, a receiver and a mobile terminal control unit.
  • Each of the UEs 400-430 can access the cellular communication system via its serving BS (one of the BSs 200-204). It should be understood that while only 16 UEs are illustratively shown in Fig. 5, there may be a large number of UEs in practice. In this sense, the description of the UEs in Fig. 5 is also for illustrative purpose only.
  • Each of the UEs 400-430 can access the cellular communication network via its serving BS.
  • the BS directly providing communication service to a certain UE is referred to as the serving BS of that UE, while other BSs are referred to non-serving BSs of that UE.
  • the non-serving BSs can function as coordinated BSs of the serving BS and provide communication service to the UE along with the serving BS.
  • the UE 416 is considered.
  • the UE 416 operates in a multi-BS coordination mode, has BS 202 as its serving BS and has BSs 200 and 204 as its coordinated BSs.
  • this embodiment focuses on the UE 416, which does not imply that the present invention is only applicable to one UE scenario. Rather, the present invention is fully applicable to multi-UE scenario.
  • the inventive method can be applied to the UEs 408, 410, 430 and the like as shown in Fig. 5.
  • the present invention is not limited to this. In fact, the present invention is not limited to any specific number of serving BS(s) or coordinated BS(s).
  • Fig. 6 is a flowchart illustrating the CQI feedback method 600 according to the present invention. In description of the embodiment, the following scenario of multi-BS coordination is assumed.
  • Example Scenario Take the UE 416 as an example, which operates in a multi-BS coordination mode, has BS 202 as its serving BS, and has BSs 200 and 204 as its coordinated BSs (non-serving BSs).
  • the UE 416 can be a single antenna or multi-antenna device.
  • its serving BS and coordinated BSs may be assumed in a similar way.
  • a set of coordinated BSs participating in multi-antenna multi-BS coordination is determined.
  • the UE can periodically report to the serving BS (e.g., the serving BS 202) path loss information from the UE to its adjacent BSs.
  • the serving BS can estimate the geographic location of the UE from the report, then determine the non-serving BSs participating in multi-BS coordination for the UE (e.g., BSs 200 and 204) and notify the UE of the non-serving BSs.
  • the UE can obtain the set of coordinated BSs based on the serving BS and the notified non-serving BSs.
  • the UE can determine by itself the non-serving BSs to participate in multi-BS coordination for the UE from the measured path loss information, thereby determining the set of coordinated BSs.
  • step S630 in accordance with the feedback design in the existing system, for one predefined sub-band or each predefined sub-band of multiple predefined sub-bands, a difference between a CQI of non-coherent joint transmission and a common CQI value measured by the UE is fed back to the serving BS (hereinafter, referred to as a difference CQI in the sense of aggregation).
  • the method 600 further includes: determining, for one predefined sub-band or each predefined sub-band of multiple predefined sub-bands, a CQI of each BS within the set of coordinated BSs in the predefined sub-band.
  • the method 600 further includes one or more of the following steps of: calculating, for one predefined sub-band or each predefined sub-band of multiple predefined sub-bands, a common CQI value in the predefined sub-band based on the CQI of each BS within the set of coordinated BSs in the predefined sub-band; feeding back, for one predefined sub-band or each predefined sub-band of multiple predefined sub-bands, the CQI of each BS within the set of coordinated BSs in the predefined sub-band to the serving BS; feeding back a sequence number(s) of the one predefined sub-band or multiple predefined sub-bands to the serving BS; and selecting, for each bandwidth part(BP) in a system bandwidth, a sub-band providing the maximum CQI of
  • the one predefined sub-band or multiple predefined sub-bands are all the preferred sub-bands in the system bandwidth, or sub-bands capable of providing the maximum CQI of non-coherent joint transmission among all the preferred sub-bands in the system bandwidth.
  • a common CQI value in one predefined sub-band or each predefined sub-band of multiple predefined sub-bands is a sum of all CQIs of all BSs within the set of coordinated BSs in the predefined sub-band.
  • a common CQI value in one predefined sub-band or each predefined sub-band of multiple predefined sub-bands is the maximum CQI among CQIs of all BSs within the set of coordinated BSs in the predefined sub-band.
  • the common CQI value in the present invention is not limited to these two examples, but may be a result of a linear function or a non-linear function having CQIs of all the BSs within the set of coordinated BSs as variants. This will be explained below in detail.
  • the feedback mode of the UE 416 is configured by the serving BS 202 as Mode 2-0.
  • the system bandwidth of the serving BS is of N RB resource blocks, and each k resource blocks constitute one sub-band. If
  • sub-bands there are sub-bands in total over the entire system bandwidth. If there is additionally one sub-band that includes blocks of resource, and there are sub-bands in total over the entire system bandwidth. Sequence numbers are allocated to the sub-bands from low to high in terms of frequency.
  • the system bandwidth of the serving BS contains J bandwidth parts (BP).
  • J bandwidth parts
  • the value of J may be determined by the system.
  • the values that can be taken may refer to table 7.2.2-2 in the document "Physical layer procedures(Release 10)", 3GPP TS 36.213 v10.4.0 (2011-12).
  • a bandwidth part numbered as j includes N j sub-bands. The range of j is and may increases as the frequency increases.
  • the bandwidth parts are connected end to end in the frequency domain and there is no interval between any two BPs.
  • the UE 416 may select one preferred sub-band for each bandwidth part.
  • the preferred sub-band refers to a sub-band that is capable of providing the maximum CQI of non-coherent joint transmission under joint transmission.
  • the UE 416 may obtain a CQI of each BS within the set of coordinated BSs in the sub-band by measurement and calculation.
  • the UE may also calculate a CQI under joint transmission in the sub-band, i.e., CQI JT .
  • the CQI here only reflects a channel quality of the first code word, even if RI>1.
  • the UE may traverse preferred sub-bands in all the bandwidth parts, so as to calculate a difference CQI in the sense of aggregation when using the sub-band.
  • the UE may:
  • a) select a sub-band capable of providing the maximum CQI of non-coherent joint transmission from all the preferred sub-bands as the optimal sub-band, and feed back a CQI of each BS in the optimal sub-band, a sequence number of the optimal sub-band and a difference CQI in the sense of aggregation to the serving BS 202; or
  • CQI may be denoted using 4 bits, and the number of bits for sequence numbers of one or more sub-bands and the difference CQI in the sense of aggregation may be determined depending on actual system implementations. Assume that there are 16 bandwidth parts in this instance, and each bandwidth part contains one preferred sub-band. That is, there are 16 preferred sub-bands in total for the UE.
  • a signal power value corresponding to the serving BS obtained by the UE measuring a reference signal is S 0
  • a signal power value corresponding to a non-serving BS obtained by the UE measuring a reference signal is denoted as A sum of signal power values of M BSs in the set of coordinated BSs calculated by the UE is A noise power value of the UE is A CQI value corresponding to the serving BS calculated by the UE is CQI 0 .
  • a CQI value corresponding to a non-serving BS calculated by the UE is A difference CQI in the sense of aggregation is denoted as The UE's actual CQI of non-coherent joint transmission is CQI JT .
  • CQI JT may be defined as:
  • the functions f 1 and f 2 are the generalized weighted summation functions. Specifically,
  • g i (x 1 ,x 2 ,...,x n ) may be either a linear function or a non-linear function.
  • the typical linear function may include, for example, the summation function and the weighted summation function, and the non-typical linear functions may include, for example, the exponential function and the logarithmic function.
  • the CQI may be defined as either It should be noted that the definition of CQI is not limited to this, but may employ various other appropriate forms.
  • the difference CQI in the sense of aggregation may be, but not limited to the following forms:
  • Form 1 Form 2: Form 3:
  • BSs 200, 202 and 204 there are three BSs in the set of coordinated BSs participating in multi-antenna and multi-BS: BSs 200, 202 and 204.
  • a CQI measurement value of the serving BS 202 is denoted as CQI 0
  • CQI measurement values of the non-serving BSs 200 and 204 may be denoted as CQI 1 and CQI 2 respectively.
  • the UE searches all the possible preferred sub-bands for the UE and measures and calculates a CQI of non-coherent joint transmission in a corresponding sub-band b, i.e., For example, definitions for the function f and CQI in Form 2 are assumed, then in the b th preferred sub-band: Assume that CQI JT on the 16 th sub-band, denoted as is maximum among all the preferred sub-bands.
  • One example quantization table applicable for defining in the above Form 1 is shown in Table 1.
  • This quantization table considers cases where may be either positive or negative.
  • the actually used quantization table may uniformly quantize below a certain threshold quantization value as one quantization index. For example, all below -1 in Table 1 may be quantized as "000".
  • the number of bits for is 3 in Table 1. However, the number of bits for the quantization index of in the practical system is not limited to 3, but may be of any other number.
  • intervals between different quantization values are the same and are all equal to 1. That is, the quantization step is constant.
  • the quantization step is not necessarily constant.
  • One example quantization table applicable for defining in the above Form 2 is shown in Table 2. This quantization table considers cases where may be negative but is impossible positive.
  • the actually used quantization table may uniformly quantize below a certain threshold quantization value as one quantization index. For example, all below -7 in Table 2 may be quantized as "00".
  • the number of bits for is 2 in Table 2. However, the number of bits for the quantization index of in the practical system is not limited to 2, but may be of any other number. In Table 2, intervals between different quantization values are different. In the practical system, the quantization step may be or may be not the same.
  • the UE may employ the following two kinds of feedback contents:
  • the UE feeds back a CQI of each BS in the optimal sub-band, a sequence number of the optimal sub-band, and a difference CQI in the sense of aggregation.
  • the CQI of the serving BS 202 in the optimal sub-band is indicated using 4 bits.
  • the sequence number of the optimal sub-band is indicated using p bits.
  • the CQI of the non-serving BS 200 in the optimal sub-band is indicated using 4 bits.
  • the CQI of the non-serving BS 204 in the optimal sub-band is indicated using 4 bits.
  • the difference CQI in the sense of aggregation is indicated using q bits.
  • p may be not equal to 4 by in other manners, and then the sequence number of the optimal sub-band may be indicated by a sequence number of a bandwidth part plus a sequence number of the sub-band within the bandwidth part.
  • the parameter p may be equal to the number of bits for the sequence number of the bandwidth part plus the number of bits for the sequence number of the sub-band within the bandwidth part.
  • the optimal sub-band is the second sub-band in the 16 th bandwidth part, and the 16 th bandwidth part contains 5 sub-bands
  • bits are needed to indicate the sequence number of the bandwidth part
  • bits are needed to indicate the sequence number of the sub-band within the bandwidth part
  • the sequence number of the optimal sub-band is formed by "1111" and "010".
  • the UE feeds back a CQI of each BS in preferred sub-bands in all the bandwidth parts, a sequence number of each preferred sub-band, and a difference CQI in the sense of aggregation in each preferred sub-band.
  • the CQI of the serving BS 202 in each preferred sub-band is indicated using 4 bits.
  • the sequence number of each preferred sub-band is indicated using p bits.
  • the CQI of the non-serving BS 200 in each preferred sub-band is indicated using 4 bits.
  • the CQI of the non-serving BS 204 in each preferred sub-band is indicated using 4 bits.
  • the difference CQI in the sense of aggregation in each preferred sub-band is indicated using q bits.
  • a sequence number of a preferred sub-band is formed by two parts: a sequence number of a bandwidth part and a sequence number of the sub-band within the corresponding bandwidth part.
  • Fig. 7 shows a schematic block diagram of a UE 700 according to the present invention.
  • the UE 700 according to the present invention includes a coordinated BS set determining unit 710, a CQI feedback unit 730, a CQI determining unit 750 and a common CQI value calculating unit 770.
  • the CQI determining unit 750 and the common CQI value calculating unit 770 are optional and are illustrated in dash lines in Fig. 7.
  • the coordinated BS set determining unit 710 may determine a set of coordinated BSs for the UE 700 based on the non-serving BSs notified by the serving BS. Alternatively, the coordinated BS set determining unit 710 may by itself determine non-serving BSs to participate in the multi-BS coordination for the UE based on path loss information measured by the UE 700, so as to determine the set of coordinated BSs.
  • the set of coordinated BSs is formed by the serving BS and the non-serving BSs.
  • the CQI feedback unit 730 may feed back, for one predefined sub-band or each predefined sub-band of multiple predefined sub-bands, a difference between a CQI of non-coherent joint transmission and a common CQI value (i.e., a difference CQI in the sense of aggregation) measured by the UE to the serving BS, in accordance with feedback designs of the existing system.
  • a difference between a CQI of non-coherent joint transmission and a common CQI value i.e., a difference CQI in the sense of aggregation
  • the CQI determining unit 750 may determine, for one predefined sub-band or each predefined sub-band of multiple predefined sub-bands, a CQI of each BS within the set of coordinated BSs in the predefined sub-band by using the existing CQI calculation techniques.
  • the common CQI value calculating unit 770 may, for one predefined sub-band or each predefined sub-band of multiple predefined sub-bands, a common CQI value based on the CQI of each BS within the set of coordinated BSs in the predefined sub-band.
  • the CQI feedback unit 730 may further feed back, for one predefined sub-band or each predefined sub-band of multiple predefined sub-bands, CQI of each BS within the set of coordinated BSs in the predefined sub-band to the serving BS.
  • the CQI feedback unit 730 may further feed back a sequence number(s) of the one predefined sub-band or multiple predefined sub-bands to the serving BS.
  • a common CQI value in one predefined sub-band or each predefined sub-band of multiple predefined sub-bands is a sum of all CQIs of all BSs in the set of coordinated BSs in the predefined sub-band.
  • a common CQI value in one predefined sub-band or each predefined sub-band of multiple predefined sub-bands is the maximum CQI among CQIs of all BSs in the set of coordinated BSs in the predefined sub-band. It should be noted that the definitions of the common CQI value is not limited to these, but may employ various forms determined by the following function:
  • the UE 700 may further include a selecting unit (not shown), configured to select, for each bandwidth part in a system bandwidth, a sub-band providing the maximum CQI of non-coherent joint transmission as a preferred sub-band for the corresponding bandwidth part.
  • a selecting unit configured to select, for each bandwidth part in a system bandwidth, a sub-band providing the maximum CQI of non-coherent joint transmission as a preferred sub-band for the corresponding bandwidth part.
  • the UE 700 may traverse all the preferred sub-bands in the system bandwidth, to calculate and feed back a difference CQI using these sub-bands.
  • the UE 700 may select a sub-band capable of providing the maximum CQI of non-coherent joint transmission from all the preferred sub-bands as the optimal sub-band, and feed back a CQI of each BS in the optimal sub-band, a sequence number of the optimal sub-band and a difference CQI when using the optimal sub-band to the serving BS.
  • CQI determining unit 750 and the common CQI value calculating unit 770 may be combined as one single unit.
  • the UE 700 may feed back a difference between a CQI of non-coherent joint transmission and a CQI common value (i.e., a difference CQI in the sense of aggregation) to the serving BS, so as to implement an effect of feeding back CQI of non-coherent joint transmission to the serving BS with small overhead.
  • a CQI of non-coherent joint transmission i.e., a difference CQI in the sense of aggregation
  • the present invention can also be expressed as follows.
  • a User Equipment comprises: a coordinated Base Station (BS) set determining unit, configured to determine a set of coordinated BSs participating in multi-BS coordination, the set of coordinated BSs containing a serving BS and a non-serving BS; and a Channel Quality Indicator (CQI) feedback unit, configured to feed back, for one predefined sub-band or each predefined sub-band of multiple predefined sub-bands, a difference between a CQI of non-coherent joint transmission and a common CQI value obtained by the UE to the serving BS.
  • BS Base Station
  • CQI Channel Quality Indicator
  • the UE further comprises a CQI determining unit, configured to determine, for one predefined sub-band or each predefined sub-band of multiple predefined sub-bands, a CQI of each BS within the set of coordinated BSs in the predefined sub-band.
  • a CQI determining unit configured to determine, for one predefined sub-band or each predefined sub-band of multiple predefined sub-bands, a CQI of each BS within the set of coordinated BSs in the predefined sub-band.
  • the UE further comprises a common CQI value calculating unit, configured to calculate, for one predefined sub-band or each predefined sub-band of multiple predefined sub-bands, a common CQI value in the predefined sub-band based on the CQI of each BS within the set of coordinated BSs in the predefined sub-band.
  • a common CQI value calculating unit configured to calculate, for one predefined sub-band or each predefined sub-band of multiple predefined sub-bands, a common CQI value in the predefined sub-band based on the CQI of each BS within the set of coordinated BSs in the predefined sub-band.
  • the CQI feedback unit is further configured to feed back, for one predefined sub-band or each predefined sub-band of multiple predefined sub-bands, the CQI of each BS within the set of coordinated BSs in the predefined sub-band to the serving BS.
  • the CQI feedback unit is further configured to feed back a sequence number(s) of the one predefined sub-band or multiple predefined sub-bands to the serving BS.
  • the UE further comprises a selecting unit, configured to select, for each bandwidth part in a system bandwidth, a sub-band providing the maximum CQI of non-coherent joint transmission as a preferred sub-band for the corresponding bandwidth part.
  • a selecting unit configured to select, for each bandwidth part in a system bandwidth, a sub-band providing the maximum CQI of non-coherent joint transmission as a preferred sub-band for the corresponding bandwidth part.
  • the one predefined sub-band or multiple predefined sub-bands are all the preferred sub-bands in the system bandwidth.
  • the one predefined sub-band or multiple predefined sub-bands are sub-bands capable of providing the maximum CQI of non-coherent joint transmission among all the preferred sub-bands in the system bandwidth.
  • a common CQI value in one predefined sub-band or each predefined sub-band of multiple predefined sub-bands is a sum of all CQIs of all BSs within the set of coordinated BSs in the predefined sub-band.
  • a common CQI value in one predefined sub-band or each predefined sub-band of multiple predefined sub-bands is the maximum CQI among CQIs of all BSs within the set of coordinated BSs in the predefined sub-band.
  • a Channel Quality Indicator (CQI) feedback method comprises: determining a set of coordinated BSs participating in multi-BS coordination, the set of coordinated BSs containing a serving BS and a non-serving BS; and feeding back, for one predefined sub-band or each predefined sub-band of multiple predefined sub-bands, a difference between a CQI of non-coherent joint transmission and a common CQI value obtained by a User Equipment (UE) to the serving BS.
  • UE User Equipment
  • the CQI feedback method further comprises: determining, for one predefined sub-band or each predefined sub-band of multiple predefined sub-bands, a CQI of each BS within the set of coordinated BSs in the predefined sub-band.
  • the CQI feedback method further comprises: calculating, for one predefined sub-band or each predefined sub-band of multiple predefined sub-bands, a common CQI value in the predefined sub-band based on the CQI of each BS within the set of coordinated BSs in the predefined sub-band.
  • the CQI feedback method further comprises: feeding back, for one predefined sub-band or each predefined sub-band of multiple predefined sub-bands, the CQI of each BS within the set of coordinated BSs in the predefined sub-band to the serving BS.
  • the CQI feedback method further comprises: feeding back a sequence number(s) of the one predefined sub-band or multiple predefined sub-bands to the serving BS.
  • the CQI feedback method further comprises: selecting, for each bandwidth part in a system bandwidth, a sub-band providing the maximum CQI of non-coherent joint transmission as a preferred sub-band of the corresponding bandwidth part.
  • the one predefined sub-band or multiple predefined sub-bands are all the preferred sub-bands in the system bandwidth.
  • the one predefined sub-band or multiple predefined sub-bands are sub-bands capable of providing the maximum CQI of non-coherent joint transmission among all the preferred sub-bands in the system bandwidth.
  • a common CQI value in one predefined sub-band or each predefined sub-band of multiple predefined sub-bands is a sum of all CQIs of all BSs within the set of coordinated BSs in the predefined sub-band.
  • a common CQI value in one predefined sub-band or each predefined sub-band of multiple predefined sub-bands is the maximum CQI among CQIs of all BSs within the set of coordinated BSs in the predefined sub-band.
  • the solution of the present invention has been described above by a way of example only.
  • the present invention is not limited to the above steps and element structures. It is possible to adjust, add and remove the steps and elements structures depending on actual requirements. Thus, some of the steps and elements are not essential for achieving the general inventive concept of the present invention. Therefore, the features necessary for the present invention is only limited to a minimum requirement for achieving the general inventive concept of the present invention, rather than the above specific examples.

Abstract

L'invention porte sur un procédé de renvoi d'indicateur de qualité de canal (CQI) et sur un équipement utilisateur (UE). Le procédé de renvoi de CQI comprend les étapes suivantes consistant à : déterminer un ensemble de stations de base (BS) coordonnées participant à une coordination multi-BS, l'ensemble de BS coordonnées contenant une BS de desserte et une BS non de desserte ; et renvoyer, pour une sous-bande prédéfinie ou chaque sous-bande prédéfinie parmi de multiples sous-bandes prédéfinies, une différence entre un CQI de transmission conjointe non cohérente et une valeur de CQI commune obtenue par l'UE à la BS de desserte. La présente invention offre les avantages d'une mise en œuvre simple et d'un faible surdébit et peut être applicable dans le système LTE-A et le système 4G.
PCT/JP2013/001845 2012-03-20 2013-03-18 Procédé de renvoi d'indicateur de qualité de canal et équipement utilisateur WO2013140782A1 (fr)

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CN110661676A (zh) * 2018-06-29 2020-01-07 电信科学技术研究院有限公司 一种带宽部分的测量方法、配置方法、终端及网络设备

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