ENHANCED CONTROL CHANNEL ELEMENT (ECCE) BASED PHYSICAL DOWNLINK SHARED CHANNEL (PDSCH) RESOURCE ALLOCATION FOR LONG-TERM EVOLUTION (LTE)

• US 20140204849A1
• Filed: 11/20/2013
• Published: 07/24/2014
• Est. Priority Date: 01/18/2013
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: CHEN, Wanshi, JI, Tingfang, XU, Hao, GAAL, Peter
• Granted Patent: US 9,871,636 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0082 at predetermined intervals
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex

Abstract

Aspects of the present disclosure provide techniques and apparatus for enhanced control channel element (ECCE) based physical downlink shared channel (PDSCH) resource allocation for long-term evolution (LTE). A method is provided for wireless communications by a user equipment (UE). The method generally includes determining resources assigned for a data channel, based on a resource granularity associated with a control channel and processing the data channel transmissions in a subframe based on the determination. The data channel may comprise a PDSCH. According to certain aspects, the UE may receive downlink control information (DCI) having a number of bits indicating VRBs assigned for PDSCH. Each VRB may include ECCEs from the same or different enhanced resource element group (EREG). ECCEs may span multiple PRB pairs or the same PRB pair. The UE may perform rate matching around enhanced physical downlink control channel (EPDCCH) overlapping assigned PDSCH resources.

Claims

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

determining resources assigned for a data channel, based on a resource granularity associated with a control channel; and

processing data channel transmissions in a subframe based on the determination.

2. The method of claim 1, wherein the resource granularity is of one or more enhanced control channel elements (ECCE).

3. The method of claim 2, wherein the resource granularity is dependent on a number of ECCEs contained in a physical resource block (PRB) pair.

4. The method of claim 1, wherein the resource granularity is smaller than a PRB pair.

5. The method of claim 2, wherein resources available for the data channel comprise virtual resource blocks (VRBs) comprising a number of ECCEs from a same group.

6. The method of claim 1, wherein the data channel comprises a physical downlink shared channel (PDSCH).

7. The method of claim 6, wherein:

at least some of the resources assigned for the PDSCH overlap with resources corresponding to an enhanced physical downlink control channel (EPDCCH); and

processing PDSCH transmissions in the subframe comprises performing rate matching based on the overlapped resources.

8. The method of claim 6, wherein

at least some PDSCH resources are assigned without corresponding control channels;

and

processing PDSCH transmissions in the subframe comprises performing blind decoding to decode PDSCH transmissions.

9. The method of claim 2, wherein determining the resources assigned for the data channel comprises:

receiving downlink control information (DCI) indicating a set of one or more virtual resource blocks, each mapped to a set of one or more ECCEs.

10. The method of claim 1, wherein subframes available for the data channel transmissions comprise:

a first fixed region with information at known locations; and

a second dynamic region in which the UE performs blind decodes to detect a physical downlink shared channel (PDSCH).

11. A method for wireless communications by a base station (BS), comprising:

assigning resources for a data channel for a user equipment (UE), based on a resource granularity associated with a control channel; and

sending data channel transmissions in a subframe based on the assignment.

12. The method of claim 11, wherein the resource granularity is dependent on a number of one or more enhanced control channel elements (ECCE).

13. The method of claim 12, wherein the resource granularity is dependent on a number of ECCEs contained in a physical resource block (PRB) pair.

14. The method of claim 11, wherein the resource granularity is smaller than a PRB pair.

15. The method of claim 12, wherein resources available for the data channel comprise virtual resource blocks (VRBs) comprising a number of ECCEs from a same group.

16. The method of claim 11, wherein the data channel comprises a physical downlink shared channel (PDSCH).

17. The method of claim 16, wherein:

at least some of the resources assigned for the PDSCH overlap with resources corresponding to an enhanced physical downlink control channel (EPDCCH).

18. The method of claim 16, wherein

at least some PDSCH resources are assigned without corresponding control channels.

19. The method of claim 12, further comprising:

sending downlink control information (DCI) indicating a set of one or more virtual resource blocks, each mapped to a set of one or more ECCEs.

20. The method of claim 11, wherein subframes available for the data channel transmissions comprise:

a first fixed region with information at known locations; and

a second dynamic region in which the UE performs blind decodes to detect a physical downlink shared channel (PDSCH).

21. The method of claim 20, wherein subframes available for the data channel transmissions also comprise:

a third region for persistently scheduled PDSCH transmissions.

22. An apparatus for wireless communications by a user equipment (UE), comprising:

means for determining resources assigned for a data channel, based on a resource granularity associated with a control channel; and

means for processing data channel transmissions in a subframe based on the determination.

23. The apparatus of claim 22, wherein the resource granularity is of one or more enhanced control channel elements (ECCE).

24. The apparatus of claim 22, wherein the data channel comprises a physical downlink control channel (PDSCH).

25. The apparatus of claim 24, wherein:

at least some of the resources assigned for the PDSCH overlap with resources corresponding to an enhanced physical downlink control channel (EPDCCH); and

processing PDSCH transmissions in the subframe comprises performing rate matching based on the overlapped resources.

26. An apparatus for wireless communications by a base station (BS), comprising:

means for assigning resources for a data channel for a user equipment (UE), based on a resource granularity associated with a control channel; and

means for sending PDSCH transmissions in a subframe based on the assignment.

27. The apparatus of claim 26, wherein the resource granularity is of one or more enhanced control channel elements (ECCE).

28. The apparatus of claim 26, wherein the data channel comprises a physical downlink control channel (PDSCH).

29. The apparatus of claim 28, wherein:

at least some of the resources assigned for the PDSCH overlap with resources corresponding to an enhanced physical downlink control channel (EPDCCH); and

processing PDSCH transmissions in the subframe comprises performing rate matching based on the overlapped resources.