System and Method for Terminal Cooperation Based on Sparse Multi-Dimensional Spreading

• US 20140169239A1
• Filed: 04/12/2013
• Published: 06/19/2014
• Est. Priority Date: 12/14/2012
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Inventors: Baligh, Mohammadhadi, Ma, Jianglei, Maaref, Amine
• Granted Patent: US 9,872,290 B2
• Time in Patent Office: Days
• US Class Current: 370/280
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• CPC Class Codes: H04L 5/0026 Division using four or more dimensions
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• 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

Abstract

System and method embodiments are provided to achieve efficient Direct Mobile Communications (DMC) and device-to-device (D2D) communications for terminal based groups with improved spectrum efficiency, reduced interference, and virtual full duplex operation mode. The embodiments include a distributed mechanism for D2D communications that enables one or more cooperating UEs (CUEs) to help one or more target UEs (TUEs) with limited additional signaling overhead and relatively simple implementation. The mechanism comprises a grantless multi-dimensional multiplexing scheme that uses low density spreading (LDS) over time, frequency, and/or space domains to enable data forwarding between multiple half-duplex terminals or UEs while allowing the UEs to operate in virtual full-duplex mode.

Claims

1. A method for supporting user equipment (UE) group based communications, the method comprising:

receiving, at a UE, a plurality of data streams for a plurality of cooperating UEs (CUEs) that share time-domain channel resources through time-domain spreading multiplexing that uses time-domain sparse spreading.

2. The method of claim 1, wherein the data streams further share frequency-domain channel resources via frequency-domain spreading multiplexing that uses frequency-domain sparse spreading.

3. The method of claim 2, wherein the frequency-domain spreading multiplexing that uses a frequency-domain sparse spreading is channelization code that allows the CUEs to share the same frequency band with limited or no additional signaling overhead.

4. The method of claim 1, wherein the data streams further share space-domain channel resources via space-domain spreading multiplexing that uses space-domain spreading.

5. The method of claim 1 further comprising:

demodulating the received data streams using orthogonal frequency-division multiplexing (OFDM) demodulation; and

descrambling the demodulated data streams to achieve whitening of inter-ViMP interference (IVI) in the data streams.

6. The method of claim 5 further comprising separating, via a multi-data-stream detector, the scrambled data streams for each virtual multi-point (ViMP) Radio node according to a corresponding ViMP Network Temporary Identifier (RNTI) and for each of the CUEs according to a corresponding UE connection ID for assigning UE specific signatures.

7. The method of claim 6 further comprising decoding and de-mapping each of the separated data streams for each of the CUEs communicating with the UE.

8. The method of claim 5, further comprising separating, via a multi-data-stream detector, the scrambled data streams according to UE specific signatures pre-assigned by a network and known to the UE.

9. The method of claim 1 further comprising using a message passing algorithm (MPA) to recover data streams from the CUEs that are transmitted during the same time intervals.

14. The method of claim 11, wherein the time-domain spreading is a time-domain sparse spreading. (Similar to claim 1, add two dependent claims for sparse feature of the spreading)

10. A method for supporting user equipment (UE) group based communications, the method comprising:

encoding and mapping, at a UE, a data stream;

spreading the data stream over frequency-domain channel resources using frequency-domain spreading; and

transmitting the data stream to a target UE (TUE).

11. The method of claim 10 further comprising further spreading the data stream over time-domain channel resources using time-domain spreading, wherein the time-domain spreading is a time-domain sparse spreading.

12. The method of claim 11 further comprising:

further spreading the data stream over space-domain channel resources using space-domain spreading; and

transmitting the data streams over the frequency-domain channel resources, the time-domain channel resources, and the space-domain channel resources.

13. The method of claim 12, wherein the space-domain spreading is a space-domain sparse spreading.

15. The method of claim 11, wherein the frequency-domain spreading and the time-domain spreading are independent.

16. The method of claim 11, wherein the time-domain spreading include transmission-off slots with zero transmissions from the UE.

17. The method of claim 16 further comprising receiving one or more data streams from one or more cooperating UEs (CUEs) during the transmission-off slots.

18. The method of claim 10, wherein the frequency-domain spreading is a frequency-domain sparse spreading.

19. The method of claim 10 further comprising, before transmitting the data stream, scrambling the data stream to enable whitening of inter-ViMP interference (IVI) from other data streams transmitted by other UEs.

20. The method of claim 19 further comprising, before transmitting the data stream, modulating the scrambled data stream using orthogonal frequency-division multiplexing (OFDM) modulation.

21. The method of claim 10 further comprising further spreading the data stream over space-domain channel resources using space-domain spreading, wherein the space-domain spreading is a space-domain sparse spreading.

22. A user equipment (UE) supporting UE group based communications, the UE comprising:

a processor; and

a computer readable storage medium storing programming for execution by the processor, the programming including instructions to receive a plurality of data streams for a plurality of cooperating UEs (CUEs) that share space-domain channel resources via space-domain spreading multiplexing.

23. The UE of claim 22, wherein the UE is a target UE (TUE) for the data streams.

24. The UE of claim 22, wherein the UE and at least some of the CUEs are located in the same virtual multi-point (ViMP) node.

25. The UE of claim 22, wherein the received data streams further share at least one of frequency-domain channel resources via frequency-domain spreading multiplexing and time-domain channel resources through time-domain spreading multiplexing

26. The UE of claim 25, wherein the UE and CUEs are configured for half-duplex operation mode, and wherein the time-domain sparse spreading multiplexing enable the UE and the CUEs for virtual full-duplex operation in time-domain.

27. The UE of claim 22, wherein the programming includes further instructions to separate the received data streams for the different CUEs according to UE specific signatures in the data streams assigned by a network and indicated to the UE through broadcast channel radio or resource control (RRC) signaling.

28. The UE of claim 22, wherein the programming includes further instructions to separate the received data streams for the different CUEs according to UE specific signatures derived from UE connection IDs in the data streams.

29. The UE of claim 22, wherein the programming includes further instructions to separate the received data streams for the different CUEs according to UE specific signatures assigned through negotiations between the UE and at least some of the are located in the same virtual multi-point (ViMP) node.

30. A user equipment (UE) supporting UE group based communications, the UE comprising:

a processor; and

a computer readable storage medium storing programming for execution by the processor, the programming including instructions to;

encode and map, at a UE, a data stream;

spread the data stream over at least one of frequency-domain channel resources using frequency-domain spreading, over time-domain channel resources using time-domain spreading, and over space-domain channel resources using space-domain spreading; and

transmit the data stream to a target UE (TUE).

31. The UE of claim 30, wherein the frequency-domain spreading and time-domain spreading allows multiplexing the data stream with other transmitted data streams from other UEs to the same TUE.

32. The UE of claim 30, wherein the frequency-domain spreading is a frequency-domain sparse spreading.

33. The UE of claim 32, wherein the frequency-domain sparse spreading enables the UE to operate in virtual full duplex mode.

34. The UE of claim 30, wherein the time-domain spreading is a time-domain sparse spreading.

35. The UE of claim 30, wherein the space-domain spreading is a space-domain sparse spreading.