Methods, user equipment and radio network node for interference mitigation in a dynamic time division duplex system

Patent metadata

Field	Value
Publication number	US-2016197690-A1
Application number	US-201314911070-A
Country	US
Kind code	A1
Filing date	Aug 15, 2013
Priority date	Aug 15, 2013
Publication date	Jul 7, 2016
Grant date	—

Abstract

The present disclosure relates to methods, a user equipment and a radio network node for interference mitigation in a dynamic TDD system comprising a user equipment ( 201, 700 ), a serving base station ( 202 ) serving the user equipment ( 201, 700 ), at least one neighboring base station ( 203 ) and at least one neighboring user equipment ( 204 ) served by the at least neighboring base station ( 203 ). The method comprises obtaining (S 301 ) link direction information and at least one transmission parameter, wherein the link direction information and the at least one transmission parameter are associated with downlink transmission of the at least one neighboring base station ( 203 ) or uplink transmission of the at least one neighboring user equipment ( 204 ). The method further comprises mitigating (S 302 ) interference caused by the downlink transmission or uplink transmission based upon the link direction information and the at least one transmission parameter. The methods, user equipment and radio network node of the present disclosure may overcome or alleviate the interference issues in the dynamic TDD system and give quality and efficiency of the wireless communication a big boost.

First claim

1 . A method in a user equipment for interference mitigation in a dynamic time division duplex system, wherein the user equipment, a serving base station serving the user equipment, at least one neighboring base station and at least one neighboring user equipment served by the at least neighboring base station are comprised in the dynamic time division duplex system, the method comprising:
obtaining link direction information and at least one transmission parameter, wherein the link direction information and the at least one transmission parameter are associated with downlink transmission of the at least one neighboring base station or uplink transmission of the at least one neighboring user equipment; and mitigating interference caused by the downlink transmission or uplink transmission based upon the link direction information and the at least one transmission parameter.

2 . The method according to claim 1 , further comprising:
determining whether or not to mitigate the interference based upon at least one of a signaling message, a blind detection and a predetermined rule.

3 . The method according to claim 1 , wherein the at least one transmission parameter is obtained indirectly from the at least one neighboring base station via the serving base station or obtained directly from the at least one neighboring base station.

4 . The method according to claim 1 , wherein the at least one transmission parameter is associated with the uplink transmission of the at least one neighboring user equipment and the method further comprises:
mitigating the interference on a subframe based upon the at least one uplink transmission parameter when the link direction information indicates the subframe being used for uplink transmission of the at least one neighboring user equipment and the interference is present in the subframe.

5 . The method according to claim 1 , wherein the at least one transmission parameter is associated with the downlink transmission of the at least one neighboring base station and the method further comprises:
mitigating the interference on a subframe based upon the at least one downlink transmission parameter when the link direction information indicates the subframe being used for downlink transmission of the at least one neighboring base station and the interference is present in the subframe.

6 . The method according to claim 5 , wherein the interference is from relatively static signal transmission of the at least one neighboring base station and the method further comprises mitigating the relatively static signal.

7 . A user equipment for interference mitigation in a dynamic time division duplex system, wherein the user equipment, a serving base station serving the user equipment, at least one neighboring base station and at least one neighboring user equipment served by the at least neighboring base station are comprised in the dynamic time division duplex system, the user equipment comprising one or more processors configured to:
obtain link direction information and at least one transmission parameter, wherein the link direction information and the at least one transmission parameter are associated with downlink transmission of the at least one neighboring base station or uplink transmission of the at least one neighboring user equipment; and mitigate interference caused by the downlink transmission or uplink transmission based upon the link direction information and the at least one transmission parameter.

8 . The user equipment according to claim 7 , wherein the one or more processors are further configured to:
determine whether or not to mitigate the interference based upon at least one of a signaling message, a blind detection and a predetermined rule.

9 . The user equipment according to claim 7 , wherein the at least one transmission parameter is obtained indirectly from the at least one neighboring base station via the serving base station or obtained directly from the at least one neighboring base station.

10 . The user equipment according to claim 7 , wherein the at least one transmission parameter is associated with the uplink transmission of the at least one neighboring user equipment and the one or more processors are further configured to mitigate the interference on a subframe based upon the at least one uplink transmission parameter when the link direction information indicates the subframe being used for uplink transmission of the at least one neighboring user equipment and the uplink interference is present in the subframe.

11 . The user equipment according to claim 7 , wherein the at least one transmission parameter is associated with the downlink transmission of the at least one neighboring base station and the one or more processors are further configured to mitigate the interference on a subframe based upon the at least one downlink transmission parameter when the link direction information indicates the subframe being used for downlink transmission of the at least one neighboring base station and the downlink interference is present in the subframe.

12 . The user equipment according to claim 11 , wherein the interference is from relatively static signal transmission of the at least one neighboring base station and the one or more processors are further configured to mitigate the relatively static signal.

13 . A method in a radio network node for interference mitigation in a dynamic time division duplex system, wherein a user equipment, the radio network node serving the user equipment, at least one neighboring base station and at least one neighboring user equipment served by the at least neighboring base station are comprised in the dynamic time division duplex system, the method comprising:
obtaining link direction information and at least one transmission parameter, wherein the link direction information and the at least one transmission parameter are associated with downlink transmission of the at least one neighboring base station or uplink transmission of the at least one neighboring user equipment; and mitigating interference caused by the downlink transmission or uplink transmission based upon the link direction information and the at least one transmission parameter.

14 . The method according to claim 13 , further comprising:
determining whether or not to mitigate the interference based upon at least one of a signaling message, a blind detection and a predetermined rule.

15 . The method according to claim 13 , wherein the at least one transmission parameter is obtained from the at least one neighboring base and the link direction information is obtained at the radio network node.

16 . The method according to claim 13 wherein the at least one transmission parameter is associated with the uplink transmission of the at least one neighboring user equipment and the method further comprises:
mitigating the interference on a subframe based upon the at least one uplink transmission parameter when the link direction information indicates the subframe being used for uplink transmission of the at least one neighboring user equipment and the interference is present in the subframe.

17 . The method according to claim 13 , wherein the at least one transmission parameter is associated with the downlink transmission of the at least one neighboring base station and the method further comprises:
mitigating the interference on a subframe based upon the at least one downlink transmission parameter when the link direction information indicates the subframe being used for downlink transmission of the at least one neighboring bas

Assignees

• Li Shaohua
• Ericsson Telefon Ab L M

Inventors

• Li Shaohua
• Fan Rui
• Guo Zhiheng
• Liu Jinhua
• Song Xinghua

Classifications

• H04W72/541

  using the level of interference · CPC title

• H04J3/10 Primary

  Arrangements for reducing cross-talk between channels · CPC title

• H04L25/0224 Primary

  using sounding signals · CPC title

• H04J11/0056

  Inter-base station aspects · CPC title

• H04J11/0059

  Out-of-cell user aspects · CPC title