MANAGING RESOURCES FOR COOPERATIVE UPLINK TRANSMISSION

• US 20170318586A1
• Filed: 07/03/2015
• Published: 11/02/2017
• Est. Priority Date: 11/05/2014
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Mingxi Fan, Naga Bhushan, Neng Wang, Qualcomm, Inc.
• Inventors: WANG, Neng, FAN, Mingxi, BHUSHAN, Naga
• Granted Patent: US 10,757,702 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/026 Co-operative diversity, e.g. using fixed or mobile stations as relays
• CPC Class Codes: H04B 7/15592 Adapting at the relay station communication parameters for supporting cooperative relaying, i.e. transmission of the same data via direct - and relayed path cooperative diversity H04B7/024
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0076 Allocation utility-based
• CPC Class Codes: H04L 5/0082 at predetermined intervals
• CPC Class Codes: H04L 5/0096 Indication of changes in allocation
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 52/223 predicting future states of the transmission
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity
• CPC Class Codes: H04W 52/46 in multi hop networks, e.g. wireless relay networks
• CPC Class Codes: H04W 72/00 Local resource management
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/0473 the resource being transmission power
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user
• CPC Class Codes: H04W 92/18 between terminal devices

Abstract

Certain aspects of the present disclosure relate to techniques for managing resources for cooperative uplink transmission. A base station may determine different groups for a plurality of user equipments (UEs) participating in cooperative uplink transmission, and transmit mode configurations indicating whether or not UEs in each group are configured to transmit data as a data source or to relay data received from another UE configured to transmit data as a data source. A UE may participate, with one or more other UEs, in cooperative uplink transmission to the base station, wherein each UE belongs to a group. The UE may determine, for a transmission time interval (TTI), at least one operation to perform for the cooperative uplink transmission based, at least in part, on a group number of a group to which the UE belongs and an index of the TTI.

Claims

1. A method for wireless communication by a user equipment (UE), comprising:

participating, with one or more other UEs, in cooperative uplink transmission to a base station, wherein each UE belongs to a group; and

determining, for a Transmission Time Interval (TTI), at least one operation to perform for the cooperative uplink transmission based, at least in part, on a group number of a group to which the UE belongs and an index of the TTI.

2. The method of claim 1, wherein the at least one operation is determined from a group of operations including at least two of:

transmitting data as a data source, receiving data from another UE transmitting as a data source, decoding data received from another UE transmitting as a data source, or transmitting data as a relay.

3. The method of claim 2, wherein transmitting data as a relay comprises transmitting data to at least one of a base station or another UE.

4. The method of claim 2, wherein the determining comprises:

determining at least one operation from the group of operations based on a modulus function involving the group number and the index of the TTI.

5. The method of claim 4, wherein the modulus function is based on how many different TTI indices are supported.

6. The method of claim 2, wherein the determining comprises:

determining, in a first TTI, to receive data transmission from another UE transmitting as a data source;

determining, in a second TTI subsequent to the first TTI, to decode the data; and

determining, in a third TTI subsequent to the first TTI, to relay the data.

7. The method of claim 1, further comprising receiving information regarding the group number of the group to which the UE belongs.

8. The method of claim 1, wherein the determining is also based on a mode configuration indicating whether or not the UE is to transmit data as a relay.

9. The method of claim 8, further comprising receiving signaling from the base station indicating the mode configuration.

10. The method of claim 1, further comprising:

determining, for each TTI, frequency resources to use for the at least one operation.

11. The method of claim 10, wherein different frequency resources are allocated to different UEs transmitting in a same TTI.

12. The method of claim 1, further comprising:

determining power allocation for a TTI based, at least in part, on whether the UE is transmitting data as a data source or transmitting data as a relay.

13. The method of claim 1, further comprising:

determining CSI between the UE and another UE; and

reporting the determined CSI to the base station

14. A method for wireless communication by a base station, comprising:

determining different groups for a plurality of UEs participating in cooperative uplink transmission to the base station, wherein operations performed by a UE in a transmission time interval (TTI) are based, at least in part, on a group number of a group to which the UE belongs and an index of the TTI; and

transmitting mode configurations indicating whether or not UEs in each group are configured to transmit data as a data source or to relay data received from another UE configured to transmit data as a data source.

15. The method of claim 14, further comprising:

receiving data transmitted by one or more UEs configured to relay data.

16. The method of claim 14, further comprising:

receiving data transmitted by one or more UEs configured to transmit data as a data source.

17. The method of claim 14, further comprising:

for each transmission time interval (TTI), allocating frequency resources for an operation to be performed by the UE.

18. The method of claim 17, wherein the allocating comprises allocating different frequency resources to different UEs transmitting in a same TTI.

19. The method of claim 14, further comprising:

deciding whether or not a UE is to be configured to transmit data directly to the base station, based on a comparison of a predicted data rate for a direct link between the UE and the base station link and a predicted data rate for one or more links between the UE and the base station via one or more UEs configured to transmit data as relays.

20. The method of claim 14, wherein determining different groups for the plurality of UEs comprises:

determining one or more UEs are in a group of UEs configured to transmit data as relays based on determined channel state information (CSI) measurements for one or more links between the UEs in the group and a UE transmitting as a data source and CSI measurements for one or more links between the UEs in the group and the base station.

21. The method of claim 20, further comprising:

receiving reports of channel state information (CSI) measurements for one or more links between the UEs in the group and a UE transmitting as a data source; and

measuring CSI for the one or more links between the UEs in the group and the base station.

22. The method of claim 20, further comprising:

predicting data rates based on the CSI measurements; and

determining the one or more UEs are in a group of UEs configured to transmit data as relays based on the predicted data rates.

23. The method of claim 22, further comprising:

sorting potential relay UEs based on the predicted data rates; and

selecting UEs to include in the group based on an analysis of predicted data rates of the sorted UEs.

24. The method of claim 23, wherein:

the sorting comprises sorting potential relay UEs, such that the predicted data rates for links between a data source UE and the potential relay UEs are in descending order; and

the selecting comprises initializing a set of UEs to include in the group, then expanding the set of UEs to include in the group based on the predicted data rates for links between the data source UE and the sorted potential relay UEs and predicted data rates for links between the sorted potential relay UEs and the base station.

25. The method of claim 24, further comprising:

sorting UEs in the expanded set of UEs to include in the group, such that the predicted data rates for links the potential relay UEs and the base station are in ascending order; and

shrinking the expanded set of UEs to include in the group by removing UEs based on the predicted data rates for links between the data source UE and the sorted UEs in the expanded set and predicted data rates for links between the sorted UEs in the expanded set and the base station.

26. The method of claim 14, further comprising:

allocating power for transmission by the UE in a TTI, based, at least in part, on whether the UE is to transmit data as a data source or transmit data as a relay.

27. An apparatus for wireless communication by a user equipment (UE), comprising:

means for participating, with one or more other UEs, in cooperative uplink transmission to a base station, wherein each UE belongs to a group; and

means for determining, for a Transmission Time Interval (TTI), at least one operation to perform for the cooperative uplink transmission based, at least in part, on a group number of a group to which the UE belongs and an index of the TTI.

28. An apparatus for wireless communication by a base station, comprising:

means for determining different groups for a plurality of UEs participating in cooperative uplink transmission to the base station, wherein operations performed by a UE in a transmission time interval (TTI) is based, at least in part, on a group number of a group to which the UE belongs and an index of the TTI; and

means for transmitting mode configurations indicating whether or not UEs in each group are configured to transmit data as a data source or to relay data received from another UE configured to transmit data as a data source.