Signaling of Network-Assisted Intra-Cell Interference Cancellation and Suppression

Patent metadata

Field	Value
Publication number	US-2016100413-A1
Application number	US-201514868738-A
Country	US
Kind code	A1
Filing date	Sep 29, 2015
Priority date	Oct 7, 2014
Publication date	Apr 7, 2016
Grant date	—

Abstract

Signaling methods to support robust interference cancellation by obtaining information associated with interfering signals from the network side are provided. The target interference for cancellation is intra-cell interference from MU-MIMO or NOMA operation. A victim receiver receives both desired signal and intra-cell interfering signal. The network may assist the victim receiver by providing information related to the interfering signal. The computational complexity of the victim receiver in blindly detecting the interference signal characteristics is reduced, and the reliability of the signal detection is improved.

First claim

What is claimed is:

1 . A method, comprising:
allocating a time-frequency radio resource to a first user equipment (UE) and a second co-channel user equipment (UE) by a serving base station (BS) in a serving cell of a mobile communication network; determining a set of parameters related to signals present in the allocated time-frequency radio resource, wherein the set of parameters comprises parameters related to a first signal and a second signal dedicated to the first UE and the second UE respectively; and transmitting the set of parameters to the second UE for the second UE to cancel/suppress a contribution of the first signal as an intra-cell interfering signal.

2 . The method of claim 1 , wherein the set of parameters comprises a first subset of parameters, each member of the first subset is common to all of the signals present in the time-frequency resource.

3 . The method of claim 1 , wherein the set of parameters comprises a second subset of parameters, each member of the second subset is specific to one of the signals present in the time-frequency resource.

4 . The method of claim 1 , wherein the BS transmits the set of parameters via a physical layer control channel or a higher layer signaling.

5 . The method of claim 1 , wherein the first subset of parameters comprises at least one of scheduling information, a resource allocation type, and resource blocks where the signals reside.

6 . The method of claim 1 , wherein the second subset of parameters comprises at least one of scheduling information, indices of antenna ports, a scrambling identity associated with a reference signal, a number of layers, a modulation order corresponding to a transport block being sent in allocated resource blocks, and precoding information.

7 . The method of claim 1 , wherein the intra-cell interfering signal comes from a multi-user multiple-input-multiple-output (MU-MIMO) channel in the serving cell.

8 . The method of claim 1 , wherein the intra-cell interfering signal comes from a non-orthogonal multiple access (NOMA) channel in the serving cell.

9 . The method of claim 8 , wherein the set of parameters comprises information related to a first signal power, a second signal power, and an indicator indicating whether to apply suppression or cancellation of the interfering signal.

10 . A method, comprising:
receiving a desired signal and an interfering signal by a user equipment (UE) in a serving cell of a mobile communication network, wherein the desired signal and the interfering signal are present in the same time-frequency resource; deriving a first set of parameters related to the interfering signal by the UE; obtaining a second set of parameters related to the interfering signal with network assistance; and cancelling or suppressing a contribution of the interfering signal from the desired signal based on the combination of the first and the second set of parameters.

11 . The method of claim 10 , wherein the first set of parameters comprises at least one of a number of co-channel UEs, indices of antenna ports, a scrambling identity associated with a reference signal, a number of layers, and a modulation order.

12 . The method of claim 10 , wherein the second set of parameters comprises at least one of scheduling information, a modulation order, a coding rate, precoding information, a mapping rule, power information, and resource allocation information.

13 . The method of claim 10 , wherein the interfering signal is from a multi-user multiple-input-multiple-output (MU-MIMO) channel in the serving cell.

14 . The method of claim 10 , wherein the interfering signal is from a non-orthogonal multiple access (NOMA) channel in the serving cell.

15 . The method of claim 14 , wherein the second set of information comprises information related to a desired signal power, an interfering signal power, and an indicator indicating whether to apply suppression or cancellation of the interfering signal.

16 . A user equipment, comprising:
a receiver that receives a desired signal and an interfering signal in a serving cell of a mobile communication network, wherein the desired signal and the interfering signal are present in the same time-frequency resource; a control and configuration circuit that derives a first set of parameters related to the interfering signal, and also obtains a second set of parameters related to the interfering signal with network assistance; and an interference cancellation (IC) circuit that cancels or suppresses a contribution of the interfering signal from the desired signal based on the combination of the first and the second set of parameters.

17 . The UE of claim 16 , wherein the first set of parameters comprises at least one of a number of co-channel UEs, indices of antenna ports, a scrambling identity associated with a reference signal, a number of layers, and a modulation order.

18 . The UE of claim 16 , wherein the second set of parameters comprises at least one of scheduling information, a modulation order, a coding rate, precoding information, a mapping rule, power information, and resource allocation information.

19 . The UE of claim 16 , wherein the interfering signal is from a multi-user multiple-input-multiple-output (MU-MIMO) channel in the serving cell.

20 . The UE of claim 16 , wherein the interfering signal is from a non-orthogonal multiple access (NOMA) channel in the serving cell.

21 . The UE of claim 20 , wherein the second set of information comprises information related to a desired signal power, an interfering signal power, and an indicator indicating whether to apply suppression or cancellation of the interfering signal.

Assignees

• Mediatek Inc

Inventors

• Hwang Chien-Hwa
• Liao Pei-Kai
• Tsai Lung-Sheng

Classifications

• H04W72/541 Primary

  using the level of interference · CPC title

• H04B7/0452 Primary

  Multi-user MIMO systems · CPC title

• H04W72/0473

  the resource being transmission power · CPC title

• H04W72/042

  Electricity · mapped topic

• H04W72/082 Primary

  Electricity · mapped topic