Transport block size limitation for enhanced control channel operation in LTE

Patent metadata

Field	Value
Publication number	US-9668167-B2
Application number	US-201313765315-A
Country	US
Kind code	B2
Filing date	Feb 12, 2013
Priority date	Mar 16, 2012
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

In wireless communication carried out by a user equipment (UE), the UE receives one or more transport blocks and makes a determination on the transport blocks, such as determining whether block size and timing advance exceed thresholds, or determining a control channel type associated with the received transport blocks. The UE makes a determination whether to perform skip-decoding of the received transport blocks based, at least in part, on the determination made.

First claim

What is claimed is:

1. A method of wireless communication, comprising:
receiving, by a user equipment (UE), one or more transport blocks;
determining a control channel type associated with the one or more transport blocks; and
selecting, by the UE, to perform a skip-decoding of at least one transport block of the one or more transport blocks based, at least in part, on the control channel type, wherein the skip-decoding comprises
attempting to decode the one or more transport blocks using a best-efforts approach that employs a decoding algorithm, which, if unsuccessful, does not trigger additional decoding attempts.

2. The method of claim 1 , wherein the control channel type comprises one of:
a physical downlink control channel (PDCCH); and
an enhanced PDCCH (EPDCCH).

3. The method of claim 2 , wherein the UE selects to perform the skip-decoding when the control channel type comprises the EPDCCH.

4. The method of claim 2 , wherein the UE selects to not perform the skip-decoding when the control channel type comprises the PDCCH.

5. The method of claim 4 , wherein the UE is configured to monitor for the EPDCCH.

6. The method of claim 1 , wherein the selecting to perform a skip-decoding is further based, at least in part, on a block size of at least one transport block of the one or more transport blocks exceeds a block size threshold.

7. A method of wireless communication, comprising:
determining, at a base station, a control channel type associated with one or more transport blocks for communication to a user equipment (UE);
determining, by the base station, whether to restrict a size of at least one transport block of the one or more transport blocks, wherein the determination is based, at least in part, on the control channel type; and
transmitting, by the base station, the one or more transport blocks to the UE based on the determination.

8. The method of claim 7 , wherein the control channel type comprises one of:
a physical downlink control channel (PDCCH); and
an enhanced PDCCH (EPDCCH).

9. The method of claim 8 , wherein the base station determines to restrict the size of the at least one transport block for the one or more transport blocks associated with the EPDCCH in a first subframe, and
wherein the base station determines not to restrict the size of the at least one transport block for the one or more transport blocks associated with the PDCCH in a second subframe.

10. The method of claim 8 , wherein the base station determines to restrict the size of the at least one transport block for the one or more transport blocks associated with the PDCCH when the UE is configured to monitor for the EPDCCH.

11. The method of claim 7 , wherein the determining is further based, at least in part, on an indication that a capability of the UE requires restriction of the size.

12. A method of wireless communication, comprising:
receiving, by a user equipment (UE), one or more transport blocks;
performing, by the UE, a size determination whether a block size of at least one transport block of the one or more transport blocks exceeds a block size threshold;
performing, by the UE, a timing determination whether a timing advance of the at least one transport block exceeds a timing advance threshold; and
making a skip-decoding decision, by the UE, whether to perform skip-decoding of the at least one transport block at least partly in response to results of the size determination and the timing determination.

13. The method of claim 12 , further including:
controlling, by the UE, the skip-decoding decision for all Hybrid Automatic-Repeat-Request (HARQ) retransmissions of the at least one transport block at least partly in response to a skip-decoding decision made, by the UE, with respect to an initial HARQ transmission of that transport block.

14. The method of claim 12 , further including:
controlling, by the UE, the skip-decoding decision for all HARQ transmissions of the at least one transport block at least partly in response to a skip-decoding decision made, by the UE, with respect to any other HARQ transmission of that transport block.

15. The method of claim 12 , further including:
controlling, by the UE, the skip-decoding decision for each HARQ transmission of the at least one transport block on an individual basis.

16. The method of claim 12 , further including:
determining, by the UE, a value of k for a TDD downlink and uplink configuration having HARQ ACK timing n+k;
determining, by the UE, whether to apply a skip-decoding decision process to all downlink subframes in an entire set of downlink subframes based on whether any downlink subframe in the entire set of downlink subframes exhibits k=4.

17. The method of claim 12 , further including:
determining, by the UE, a value of k for a TDD downlink and uplink configuration having HARQ ACK timing n+k;
selectively determining, by the UE, whether to individually apply a skip-decoding decision process to each downlink subframe in an entire set of downlink subframes based on whether each downlink subframe exhibits k=4.

18. The method of claim 12 , further including:
making, by the UE, a relax HARQ timing decision in response to the skip-decoding decision, wherein the relax HARQ timing decision causes the UE to delay an ACK/NAK transmission at least until a next HARQ transmission opportunity.

19. The method of claim 12 , further including:
performing, by the UE, soft buffer management by discarding samples received in a subframe in which the UE skipped decoding.

20. The method of claim 12 , further including:
performing, by the UE, soft buffer management by storing samples received in a subframe in which the UE skipped decoding.

21. The method of claim 12 , further including:
performing, by the UE, soft buffer management by making a determination whether soft buffer overbooking exists; and
selectively discarding samples received in a subframe in which the UE skipped decoding in response to the determination.

22. The method of claim 12 , further including:
performing timing advance selection for a component carrier in the presence of more than one timing advance group, wherein the timing advance of the group to which the component carrier belongs is selected.

23. The method of claim 12 , further including:
performing timing advance selection for a component carrier in the presence of more than one timing advance group, wherein a maximum timing advance of all component carriers is selected.

24. The method of claim 12 , wherein the size determination performs transport block size limitation on a per downlink control information basis, wherein the skip-decoding decision is made on the basis of a sum of sizes of two transport blocks.

25. The method of claim 12 , wherein the size determination performs transport block size limitation on a per downlink control information basis, wherein the skip-decoding decision is made on the basis of a sum of sizes of four transport blocks.

26. The method of claim 12 , wherein the size determination performs transport block size limitation on a UE-category dependent basis.

27. The method of claim 12 , wherein the size determination performs transport block size limitation based on a sum of sizes of transport blocks in a subframe.

28. The method of claim 12 , wherein the size determination performs transport block size limitation ind

Assignees

• Qualcomm Inc

Inventors

• Chen Wanshi
• Gaal Peter
• Xu Hao

Classifications

• H04L1/1854

  Scheduling and prioritising arrangements · CPC title

• H04L1/005 Primary

  Iterative decoding, including iteration between signal detection and decoding operation · CPC title

• H04L1/0051

  Stopping criteria · CPC title

• H04L5/008

  once only, on installation · CPC title

• H04W28/0289 Primary

  Congestion control (load shedding arrangements in network planning H04W16/08; performing reselection for handling the traffic H04W36/22; wireless traffic scheduling H04W72/12) · CPC title