Method and system of advanced interference cancellation on PDSCH at the UE

• US 10,050,692 B2
• Filed: 08/07/2014
• Issued: 08/14/2018
• Est. Priority Date: 08/08/2013
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Intel IP Corporation (Intel Corporation)
• Inventors: Davydov, Alexei, Han, Seunghee, Morozov, Gregory
• Primary Examiner(s): Nguyen, Thai
• Application Number:
  US14/903,575
• Publication Number:
  US 20160173262A1
• Time in Patent Office: 1,468 Days
• CPC Class Codes: E04G 23/0218 Increasing or restoring the load-bearing capacity of building construction elements E04G23/0203 and E04G23/0266 take precedence
• CPC Class Codes: E04H 9/025 Structures with concrete columns
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/0075 Transmission of coding parameters to receiver H04L1/0023 takes precedence
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1835 Buffer management
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0058 Allocation criteria
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04L 5/1469 using time-sharing
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 24/02 : Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/10 : Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 36/08 : Reselecting an access point
• CPC Class Codes: H04W 36/14 : Reselecting a network or an air interface
• CPC Class Codes: H04W 36/28 : involving a plurality of connections, e.g. multi-call or multi-bearer connections
• CPC Class Codes: H04W 36/32 : by location or mobility data, e.g. speed data
• CPC Class Codes: H04W 4/023 : using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
• CPC Class Codes: H04W 4/70 : Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 48/12 : using downlink control channel
• CPC Class Codes: H04W 48/16 : Discovering, processing access restriction or access information
• CPC Class Codes: H04W 52/0206 : in access points, e.g. base stations access point devices per se H04W88/08
• CPC Class Codes: H04W 52/0209 : in terminal devices terminal devices per se H04W88/02
• CPC Class Codes: H04W 52/0219 : where the power saving management affects multiple terminals
• CPC Class Codes: H04W 56/0005 : synchronizing of arrival of multiple uplinks
• CPC Class Codes: H04W 64/006 : with additional information processing, e.g. for direction or speed determination
• CPC Class Codes: H04W 72/0446 : Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/20 : Control channels or signalling for resource management
• CPC Class Codes: H04W 72/541 : using the level of interference
• CPC Class Codes: H04W 74/0833 : Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 76/10 : Connection setup
• CPC Class Codes: H04W 76/14 : Direct-mode setup
• CPC Class Codes: H04W 76/27 : Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 8/02 : Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
• CPC Class Codes: H04W 88/02 : Terminal devices
• CPC Class Codes: H04W 88/04 : adapted for relaying to or from another terminal or user
• CPC Class Codes: H04W 88/08 : Access point devices
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

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.

Claims

1. A method of mitigating interference on a Physical Downlink Shared Channel (PDSCH) at a user equipment (UE) in a wireless communication system, the UE comprising an interference cancellation receiver and the method comprising:

receiving, at the UE, downlink control information (DCI), the DCI comprising a bit for specifying to the UE at least one antenna on the UE for receiving an interfering signal;

receiving, at the UE, the PDSCH and the interfering signal, wherein the interfering signal interferes with receiving the PDSCH at the UE;

obtaining, at the UE, information defining parameters used in a coding procedure used to encode the interfering signal; and

suppressing interference caused by the interfering signal when the UE is receiving the PDSCH based on the obtained information by decoding the interfering signal using the parameters defined by the obtained information and using the decoded interfering signal for interference cancellation.

2. The method of claim 1, wherein obtaining, at the UE, information defining parameters used in a coding procedure used to encode the interfering signal comprises:

receiving information, at the UE, about Hybrid Automatic Repeat Request (HARQ) soft buffer partition by configuration of one or more first parameter sets comprising;

a parameter that defines a UE category,

a parameter that defines a UE capability of supporting at least two spatial layers for a downlink (DL) cell,

a parameter that defines a number of HARQ processes, or

a parameter that defines a number of component carriers (CCs); and

receiving an indication of which of the one or more first parameter sets to use for the decoding of the interfering signal;

or

assuming, at the UE, a second set of parameters, the second set of parameters comprising;

a parameter that defines a UE category,

a parameter that defines a UE capability of supporting at least two spatial layers for a DL cell,

a parameter that defines a number of HARQ processes, or

a parameter that defines a number of CCs, wherein the second set of parameters is for decoding a serving signal;

or

receiving and using default values for a third set of parameters, the third set of parameters comprising;

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, or

a parameter that defines a number of CCs, wherein the third set of parameters is for decoding one or more of a serving signal and the interfering signal.

3. The method of claim 1, further comprising receiving another interfering signal that interferes with receiving the PDSCH at the UE, wherein the interference cancellation receiver comprises an interference cancellation and suppression receiver, and wherein obtaining, at the UE, information defining parameters used in a coding procedure used to encode the interfering signal further comprises:

receiving at least two modulation schemes corresponding to the two interfering signals by signaling.

4. The method of claim 3, further comprising receiving, at the UE, a plurality of spatial layers, wherein a spatial layer of the plurality of spatial layers comprises either a serving signal or interfering signal.

5. The method of claim 4, wherein, for PDSCH transmission with a plurality of spatial layers, a UE-specific reference signal (RS) assigns one or more of the following UE-specific antenna ports:

antenna ports 9, 10, 11, and 13.

6. The method of claim 5, wherein at least one DCI bit or radio resource control (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 at least one of the UE-specific antenna ports for the PDSCH transmission.

7. The method of claim 6, wherein a DCI format comprises DCI format 2E and wherein 4 bits are used to determine the at least one of the UE-specific antenna ports, scrambling identity, and number of layers in use.

8. The method of claim 1, further comprising receiving, at the UE, a UE-specific reference signal (RS), the UE-specific reference signal specifying to the UE that the UE can process more spatial layers than a number of antennas in use on the UE, wherein a spatial layer comprises a received data stream.

9. The method of claim 8, wherein a received data stream comprises a serving data stream or an interfering data stream.

10. The method of claim 9, wherein a serving data stream is a data stream intended to be received at the UE, and an interfering data stream is a data stream unintentionally received at the UE and which interferes with a reception of the serving data stream.

11. The method of claim 1, further comprising determining one or more antenna ports, one or more scrambling identities, and one or more layers used for PDSCH transmission, wherein a mapping table is used by the UE for the determination.

12. The method of claim 1, further comprising improving channel estimation performance for UE-specific reference signals on the interfering signal by configuring a physical resource block (PRB) bundling assumption for the interfering signal using radio resource control (RRC) signaling.

13. The method of claim 1, further comprising receiving signaling of a PDSCH resource element (RE) mapping used on the interfering signal, wherein the signaling includes further configuration information for the UE, the further configuration information including one or more sets of data comprising a plurality of parameters, the plurality comprising:

{PDSCH start, zero power channel state information reference signals (ZP CSI-RS), non-zero power channel state information reference signals (NZP CSI-RS), Multicast Broadcast Single Frequency Network (MBSFN) subframes), cell specific reference signal (CRS) configuration}, wherein CRS configuration includes a number of CRS antenna ports and Cell identifier.

14. The method of claim 13, wherein the signaling of the PDSCH RE mapping comprising signaling using Interfering PDSCH RE mapping and Quasi co-location signaling bits in downlink control information (DCI) transmission.

15. A non-transitory computer readable medium comprising one or more instructions, the one or more instructions comprising instructions for mitigation of interference on a Physical Downlink Shared Channel (PDSCH) at a user equipment (UE) in a wireless communication system, the UE comprising an interference cancellation receiver and one or more processors configured to execute the instructions for the mitigation to:

receive downlink control information (DCI), the DCI comprising a bit for specifying to the UE at least one antenna coupled to the UE for receiving an encoded interfering signal;

receive the PDSCH and the encoded interfering signal, wherein the encoded interfering signal interferes with reception of the PDSCH by the UE;

obtain characteristics information about the encoded interfering signal;

derive encoding parameters of the encoded interfering signal from the obtained characteristics information; and

cancel interference caused by the encoded interfering signal when receiving the PDSCH by using the derived encoding parameters to decode the interfering signal and using the decoded interfering signal in an interference cancellation procedure.

16. The non-transitory computer readable medium of claim 15, wherein the one or more processors are further configured to execute the instructions for the mitigation to:

derive encoding parameters of the encoded interfering signal from the obtained characteristics information by obtaining information about Hybrid Automatic Repeat Request (HARQ) soft buffer partition configuration according to one or more parameter sets which includes a first set of parameters, the first set of parameters comprising;

a parameter that defines a UE category,

a parameter that defines a UE capability of supporting at least two spatial layers for a downlink (DL) cell,

a parameter that defines a number of HARQ processes, or

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 interfering signal;

or

derive encoding parameters of the encoded interfering signal from the obtained characteristics information by assuming a second set of encoding parameters are applicable to the encoded interfering signal, the second set of parameters comprising;

a parameter that defines a UE category,

a parameter that defines a UE capability of supporting at least two spatial layers for a DL cell,

a parameter that defines a number of HARQ processes, or

a parameter that defines a number of CCs;

or

derive encoding parameters of the encoded interfering signal from the obtained characteristics information by using default values for the encoding parameters, wherein the encoding parameters include;

a default value for a parameter that defines a UE category,

a default value for a parameter that defines a UE capability of supporting at least two spatial layers for a DL cell,

a default value for a parameter that defines a number of HARQ processes, or

a default value for a parameter that defines a number of CCs.

17. The non-transitory computer readable medium of claim 15, wherein the one or more processors are further configured to execute the instructions for the mitigation to:

obtain characteristics information about another interfering signal that interferes with receiving the PDSCH at the UE; and

derive encoding parameters of the two encoded interfering signals from the obtained characteristics information, wherein the one or more processors being configured to execute the instructions for the mitigation to derive the encoding parameters of the two encoded interfering signals from the obtained characteristics information comprises the one or more processors being configured to execute the instructions for the mitigation to receive at least two modulation schemes corresponding to the two interfering signals by signaling.

18. A circuit for use in an evolved node base station (eNodeB) in a wireless communication system, the circuit comprising:

means for transmitting a first signal to a user equipment (UE), the first signal to include downlink control information (DCI), the DCI comprising a bit specifying at least one antenna on the UE for receiving a second signal expected to interfere with the first signal transmitted to the UE;

means for identifying the second signal in the wireless communication system; and

means for transmitting, to the UE, information defining parameters used in a coding procedure used to encode the second signal.

19. A circuit for use in a user equipment (UE) in a wireless communication system, the circuit comprising:

means for receiving downlink control information (DCI), the DCI comprising a bit for specifying to the UE at least one antenna on the UE for receiving an interfering signal;

means for receiving a Physical Downlink Shared Channel (PDSCH) and the interfering signal, wherein the interfering signal interferes with receiving the PDSCH at the UE;

means for obtaining information defining parameters used in a coding procedure used to encode the interfering signal; and

means for suppressing interference caused by the interfering signal when the UE is receiving the PDSCH based on the obtained information by decoding the interfering signal using the parameters defined by the obtained information and using the decoded interfering signal for interference cancellation.

20. A user equipment (UE), comprising:

processing circuitry;

an antenna array including a plurality of antennas, the antenna array coupled to the processing circuitry; and

at least one selected from a group consisting of;

a screen, a speaker, a touchscreen, a keyboard, a graphics processor, and an application processor,

wherein the processing circuitry is configured to;

receive downlink control information (DCI), the DCI comprising a bit for specifying to the UE at least one antenna on the UE for receiving an interfering signal;

receive a Physical Downlink Shared Channel (PDSCH) and the interfering signal, wherein the interfering signal interferes with receiving the PDSCH at the UE;

obtain information defining parameters used in a coding procedure used to encode the interfering signal; and

suppress interference caused by the interfering signal when the UE is receiving the PDSCH based on the obtained information by decoding the interfering signal using the parameters defined by the obtained information and using the decoded interfering signal for interference cancellation.