Method and system of advanced interference cancellation on pdsch at the ue

Patent metadata

Field	Value
Publication number	US-2016173262-A1
Application number	US-201414903575-A
Country	US
Kind code	A1
Filing date	Aug 7, 2014
Priority date	Aug 8, 2013
Publication date	Jun 16, 2016
Grant date	—

Abstract

Methods and apparatuses for communicating in a wireless network include provision of interfering signal characteristics information including parameters used in a coding procedure used to encode at least one interfering signal to a user equipment to facilitate suppression of the at least one interfering signal present in a downlink signal being received at the user equipment.

First claim

1 . A method of mitigating interference on the Physical Downlink Shared Channel (PDSCH) at a user equipment in a wireless communication system, wherein the user equipment comprises an interference cancellation receiver for receiving on the PDSCH, the method comprising:
receiving, at the user equipment, the PDSCH in the presence of at least one interfering signal; obtaining, at the user equipment, information defining parameters used in a coding procedure used to encode the at least one interfering signal; and suppressing interference caused by the at least one interfering signal when receiving the PDSCH based on the obtained information by decoding the at least one interfering signal using the parameters defined by the obtained information and using the decoded at least one interfering signal for interference cancellation.

2 . The method of claim 1 , wherein obtaining, at the user equipment, information defining parameters used in a coding procedure used to encode the at least one interfering signal comprises:
receiving information, at the user equipment, about HARQ soft buffer partition by configuration of one or more parameter sets which includes the parameters: a parameter that defines a UE category, a parameter that defines a UE capability of supporting at least two spatial layers for the DL cell, a parameter that defines a number of HARQ processes, a parameter that defines a number of component carriers (CCs); and receiving an indication of which of the one or more parameter sets to use for the decoding of the at least one interfering signal; OR assuming, at the user equipment, a same set of parameters: a parameter that defines a UE category, a parameter that defines a UE capability of supporting at least two spatial layers for the DL cell, a parameter that defines a number of HARQ processes, a parameter that defines a number of CCs, which are used for the decoding of the serving signal are applicable to the at least one interfering signal as well; OR receiving and using default values for the parameters: a parameter that defines a UE category, a parameter that defines a UE capability of supporting at least two spatial layers for the DL cell, a parameter that defines a number of HARQ processes, a parameter that defines a number of CCs, for the decoding of the serving and the at least one interfering signal.

3 . The method of claim 1 , wherein the interference cancellation receiver comprises an interference cancellation and suppression receiver, and wherein obtaining, at the user equipment, information defining parameters used in a coding procedure used to encode the at least one interfering signal further comprises:
receiving at least two modulation schemes corresponding to at least two interfering signals by signaling.

4 . The method of claim 1 , further comprising providing a capability to process more spatial layers at the UE than a number of antennas in use on the UE, wherein a spatial layer comprises a received data stream.

5 . The method of claim 4 , wherein a received data stream comprises a serving data stream or an interfering data stream.

6 . The method of claim 5 , wherein a serving data stream is a data stream intended to be received at the user equipment, and an interfering data stream is a data stream unintentionally received at the user equipment and which interferes with a reception of the serving data stream.

7 . The method of claim 3 , wherein there are at least two spatial layers received at the user equipment, wherein a spatial layer comprises either a serving signal or interfering signal, and wherein the signaling comprises an indication of which UE-specific antenna ports to be used for the interfering PDSCH using an additional bit in a DCI format.

8 . The method of claim 3 , wherein UE-specific RS may use:
antenna ports 11 , 13 for the PDSCH transmission with 1 or 2 spatial layers; or antenna ports 9 , 10 for the PDSCH transmission with 1 or 2 spatial layers.

9 . The method of claim 8 , wherein a DCI bit or RRC signaling is used between a new {antenna port(s), scrambling identity and number of layers} mapping table and a legacy {antenna port(s), scrambling identity and number of layers} mapping table to determine antenna ports used for PDSCH transmission.

10 . The method of claim 9 , wherein the DCI format comprises DCI format 2E and 4 bits are used to determine antenna port(s), scrambling identity and number of layers in use.

11 . The method of claim 1 , wherein a mapping table is used by the user equipment for determination of antenna port, scrambling identity and layers used for PDSCH transmission.

12 . The method of claim 1 , further comprising improving channel estimation performance for UE-specific reference signals on an interfering signal by configuring the PRB bundling assumption for the interfering signals using RRC signaling.

13 . The method of claim 1 , further comprising receiving signaling of a PDSCH REs mapping used on the interfering signals, wherein the signaling includes further configuration information for the user equipment, the further configuration information including one or more sets of data that includes the following parameters: {PDSCH start, ZP CSI-RS, NZP CSI-RS, MBSFN subframes, CRS configuration}, where CRS configuration includes number of CRS antenna ports and Cell ID.

14 . The method of claim 13 , wherein the signaling PDSCH REs mapping comprising signaling using Interfering PDSCH RE mapping and Quasi co-location signaling, IPQI, bits in the DCI transmission.

15 . An apparatus for use in a wireless communication system, the apparatus comprising processing circuitry to:
obtain characteristics information about at least one encoded interfering signal; derive encoding parameters of the at least one encoded interfering signal from the obtained characteristics information; and cancel interference caused by the at least one encoded interfering signal when receiving a PDSCH in the presence of the at least one encoded interfering signal by using the derived encoding parameters to decode the at least one interfering signal and using the decoded at least one interfering signal in an interference cancellation procedure.

16 . The apparatus of claim 15 , wherein the circuitry is further configured to:
derive encoding parameters of the at least one encoded interfering signal from the obtained characteristics information by obtaining information about HARQ soft buffer partition configuration according to one or more parameter sets which includes the parameters: a parameter that defines a UE category, a parameter that defines a UE capability of supporting at least two spatial layers for the DL cell, a parameter that defines a number of HARQ processes, a parameter that defines a number of component carriers (CCs), and receive an indication of which of the one or more parameter sets to use for the decoding of the at least one interfering signal; OR derive encoding parameters of the at least one encoded interfering signal from the obtained characteristics information by assuming a same set of encoding parameters applicable to a received PDSCH signal are also applicable to the at least one encoded interfering signal, wherein the encoding parameters of the received PDSCH signal include: a parameter that defines a UE category, a parameter that defines a UE capability of supporting at least two spatial layers for the DL cell, a parameter that defines a number of HARQ processes, and a parameter that defines a number of CCs, which are used for the decoding of the serving signal are applicable to the at least one interfering signal as we

Assignees

• Intel Ip Corp

Inventors

• Davydov Alexei
• Han Seunghee
• Morozov Gregory

Classifications

• H04W72/541

  using the level of interference · CPC title

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04L1/1835

  Buffer management · CPC title