Downlink control signaling

Patent metadata

Field	Value
Publication number	US-2018123769-A1
Application number	US-201615547250-A
Country	US
Kind code	A1
Filing date	Jan 28, 2016
Priority date	Jan 28, 2015
Publication date	May 3, 2018
Grant date	—

Abstract

Techniques for efficient downlink control with a large number of carriers and/or TTIs are described. Techniques for blind decoding reduction may include making the search space and/or aggregation level of candidates for a first PDCCH/E-PDCCH associated with the characteristics of a second received PDCCH/E-PDCCH. Techniques may include embedding DCI for a set of serving cells and/or TTIs in a PDSCH. DCI for a set of serving cells and/or TTIs may be included in single PDCCH/E-PDCCH. To reduce overhead, carrier indicator field interpretation may be associated with the serving cell or TTI from which the PDCCH/E-PDCCH containing the downlink control information is received, or the group of cells or TTIs to which the PDCCH/E-PDCCH containing the downlink control information belongs.

First claim

What is claimed is:

1 . A method performed by a wireless transmit/receive unit (WTRU), the method comprising:
the WTRU decoding a first downlink control information (DCI) via a first downlink control channel of a first serving cell, wherein the first DCI comprises scheduling information for a first physical downlink shared channel (PDSCH) transmission; the WTRU decoding a second DCI via a second downlink control channel of a second serving cell, wherein the second DCI comprises scheduling information for a second PDSCH transmission; the WTRU determining that the first PDSCH transmission is to be received via a third serving cell based on the first DCI indicating a first value for a carrier indicator field (CIF) and based on the first DCI being received via the first serving cell; the WTRU determining that the second PDSCH transmission is to be received via a fourth serving cell based on the second DCI indicating the first value for a carrier indicator field and based on the second DCI being received via the second serving cell; the WTRU receiving the first PDSCH transmission via the third serving cell in accordance with the first DCI; and the WTRU receiving the second PDSCH transmission via the fourth serving cell in accordance with the second DCI.

2 . The method of claim 1 , wherein the WTRU interprets a CIF of a received DCI based on the identity of the serving cell over which the received DCI was received.

3 . The method of claim 1 , wherein the WTRU determines that the first PDSCH transmission is to be received via the third serving cell based on the first serving cell being a member of a first cell group, and the WTRU determines that the second PDSCH transmission is to be received via the fourth serving cell based on the second serving cell being a member of a second cell group.

4 . The method of claim 2 , wherein the first group identity is determined based on at least an identity of the first scheduling serving cell, and wherein the second group identity is determined based on at least an identity of the second scheduling serving cell.

5 . The method of claim 1 , wherein the first scheduling serving cell belongs to a first group of a plurality of serving cells and the second scheduling serving cell belongs to a second group of the plurality of serving cells, and wherein the first group identity is determined based on at least an identity of the first group, and wherein the second group identity is determined based on at least an identity of the second group.

6 . The method of claim 1 , wherein the first and second downlink control channels corresponds to one of a physical downlink control channel (PDCCH) or an enhanced PDCCH (E-PDCCH).

7 . A wireless transmit/receive unit (WTRU) comprising:
a memory; and a processor configured to: decode a first downlink control information (DCI) via a first downlink control channel of a first serving cell, wherein the first DCI comprises scheduling information for a first physical downlink shared channel (PDSCH) transmission; decode a second DCI via a second downlink control channel of a second serving cell, wherein the second DCI comprises scheduling information for a second PDSCH transmission; determine that the first PDSCH transmission is to be received via a third serving cell based on the first DCI indicating a first value for a carrier indicator field (CIF) and based on the first DCI being received via the first serving cell; determine that the second PDSCH transmission is to be received via a fourth serving cell based on the second DCI indicating the first value for a carrier indicator field and based on the second DCI being received via the second serving cell; receive the first PDSCH transmission via the third serving cell in accordance with the first DCI; and receive the second PDSCH transmission via the fourth serving cell in accordance with the second DCI.

8 . The method of claim 7 , wherein the WTRU determines a location where the WTRU attempts to decode the first DCI base on the first value of the CIF included in the first DCI.

9 . A wireless transmit/receive unit (WTRU) comprising:
a memory; and a processor configured to: decode a first downlink control information (DCI) via a first downlink control channel of a first scheduling serving cell, wherein the first DCI comprises scheduling information for a first physical downlink shared channel (PDSCH) transmission received by the WTRU via a first scheduled serving cell; decode a second DCI via a second downlink control channel of a second scheduling serving cell, wherein the second DCI comprises scheduling information for a second PDSCH transmission received by the WTRU via a second scheduled serving cell; receive the first PDSCH transmission via the first scheduled serving cell in accordance with the first DCI, wherein the first scheduled serving cell is determining based on a first group identity contained in the first DCI; and receive the second PDSCH transmission via the second scheduled serving cell in accordance with the second DCI, wherein the second scheduled serving cell is determining based on a second group identity contained in the second DCI.

10 . The WTRU of claim 9 , wherein the first group identity is determined based on at least a first carrier indicator field (CIF) of the first DCI, and wherein the second group identity is determined based on at least a second carrier indicator field (CIF) of the second DCI.

11 . The WTRU of claim 9 , wherein the first group identity is determined based on at least an identity of the first scheduling serving cell, and wherein the second group identity is determined based on at least an identity of the second scheduling serving cell.

12 . The WTRU of claim 10 , wherein the first group identity is determined based on at least an identity of the first scheduling serving cell, and wherein the second group identity is determined based on at least an identity of the second scheduling serving cell.

13 . The WTRU of claim 9 , wherein the first scheduling serving cell belongs to a first group of a plurality of serving cells and the second scheduling serving cell belongs to a second group of the plurality of serving cells, and wherein the first group identity is determined based on at least an identity of the first group, and wherein the second group identity is determined based on at least an identity of the second group.

14 . The WTRU of claim 9 , wherein the downlink control channel corresponds to one of a physical downlink control channel (PDCCH) or an enhanced PDCCH (E-PDCCH).

15 . A wireless transmit/receive unit (WTRU) comprising:
a memory; and a processor configured to: decode a first downlink control information (DCI) via a first downlink control channel of a first scheduling serving cell, wherein the first DCI comprises scheduling information for a first physical downlink shared channel (PDSCH) transmission received by the WTRU via a first scheduled serving cell; decode a second DCI via the first downlink control channel of the first scheduling serving cell, wherein the second DCI comprises scheduling information for a second PDSCH transmission received by the WTRU via a second scheduled serving cell; receive the first PDSCH transmission via the first scheduled serving cell in accordance with the first DCI, wherein the first scheduled serving cell is determining based on a first group identity contained in the first DCI; and receive the second PDSCH transmission via the second scheduled serving cell in accordance with the second DCI, wherein the second scheduled serving cell is determining based on a second group

Assignees

• Interdigital Patent Holdings Inc

Inventors

• Pelletier Ghyslain
• Marinier Paul
• Rudolf Marian
• Tooher J Patrick

Classifications

• H04L5/0094 Primary

  Indication of how sub-channels of the path are allocated · CPC title

• H04W88/02

  Terminal devices · CPC title

• H04L1/1896

  ARQ related signaling · CPC title

• H04L5/001 Primary

  the frequencies being arranged in component carriers · CPC title

• H04L1/1822

  involving configuration of automatic repeat request [ARQ] with parallel processes · CPC title