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1. (WO2017003962) ACQUISITION D’INFORMATIONS D’ÉTAT DE CANAL DANS UN SYSTÈME DE COMMUNICATION SANS FIL
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CLAIMS

We claim

1. A method for uplink Sounding Reference Signal (SRS) transmission in a MU-MIMO wireless communication system comprising a BS reserving resources for SRS transmission and multiplexing the reserved resources among neighboring cells and among multiple UEs allocated to the same SRS transmission resource; the BS estimating the CQI of each UE through the uplink channel; and the BS allocating the same resource to a group of UEs to transmit uplink SRSs based on the estimated channel quality and the Quality of Service (QoS) requirement.

2. The method in Claim 1 further comprising the CQI and QoS requirement differences between any two UEs in a group are less than predefined thresholds.

3. The method in Claim 1 further comprising SRS transmission resource is specially reserved for each BS.

4. The method in Claim 1 further comprising that the NsRS consecutive OFDM symbols in a radio resource frame are reserved for SRS transmission, where the NsRS SRS symbols are multiplexed among NBS neighboring cells through TDM or FDM.

5. The method in Claim 4 further comprising that TDM is implemented by each of the NBS neighboring BSs using specified NSRS/NQS of the iVSRS SRS symbols calculated based on the BS identification number BS_ID or cell ID to transmit SRSs.

6. The method in Claim 4 further comprising that FDM is implemented by dividing the whole band into NBS segments, where each BS is allocated one segment in one SRS symbol based on BS_ID or cell ID and the SRS symbol index in a subframe so that each BS uses a different segment in a different SRS symbol.

7. The method in Claim 1 further comprising the BS estimating CQI of a UE through the pilot or reference signals transmitted in the uplink random access channel, uplink ranging channel, or other uplink channels used to transmit uplink control messages.

8. The method in Claim 1 further comprising the BS grouping the UEs according to their CQI and the QoS requirements including one or more of the downloading speed, the amount of data to be transmitted, where the UEs whose channel quality differences are lower than a predefined threshold and whose QoS requirement differences are also lower than a predefined threshold are allocated to the same group with the same SRS transmission resource.

9. The method in Claim 8 further comprising the resource allocated for a group of UEs for SRS transmission in the reserved SRS transmission symbols for a BS consisting of several SRS RUs, where each SRS RU is the minimum SRS transmission unit consisting of several continuous subcarriers in the frequency domain and one to several OFDM symbols in the time domain.

10. The method in Claim 9 further comprising multiple UEs in a group being multiplexed through FDM in an SRS RU, where the FDM multiplexing is implemented by allocating each UE a different set of subcarriers.

11. The method in Claim 9 further comprising that multiple UEs in a group are multiplexed through CDM in an SRS RU, where the CDM multiplexing is implemented by allocating each UE a specific sequence orthogonal to other UEs in the same group.

12. The method in Claim 11 further comprising every NBS BSs being allocated a set of orthogonal sequences selected from predefined orthogonal sequence sets, where the absolute value of the correlation coefficient between any two sequences from two different sequence sets being a constant value.

13. A method for uplink Sounding Reference Signal (SRS) transmission in a MU-MIMO wireless communication system comprising a BS determining the CQI of each UE through uplink signaling; the BS grouping UEs according to their CQI; the UEs in the same group being allocated to the same SRS RU.

14. The method in claim 13 wherein the uplink signaling uses the physical ranging channel and the physical uplink control channel.

15. The method in claim 13 wherein the uplink signaling uses the physical uplink control channel.

16. The method in claim 13 further comprising the UEs among whom the maximum CQI difference is less than a predefined threshold value being allocated into the same SRS RU.