Coordination and signaling in NAICS and interference partitioning
View Patent ↗A framework for enabling a user equipment (UE) to apply interference suppression processing during network conditions that are favorable to interference suppression or that are known is provided. The framework includes an interference suppression (IS) time and frequency (time/frequency) zone, which can be scheduled by a serving base station and signaled to the UE. In an embodiment, the serving base station coordinates with the interfering base station(s) to create a network condition favorable to interference suppression at the UE during the IS time/frequency zone. In another embodiment, the serving base station opportunistically schedules the IS time/frequency zone for the UE whenever it determines favorable transmission parameters being used or scheduled for use by the interfering base station(s). The UE applies interference suppression processing within the IS time/frequency zone, thereby improving receiver performance.
1. A method to assist a user equipment served by a serving base station to suppress interference from an interfering base station, comprising:
setting transmission parameters of the interfering base station in a scheduled time and frequency (time/frequency) zone;
signaling the scheduled time/frequency zone to the user equipment;
signaling an indication of a pre-defined interference scenario, from among a plurality of pre-defined interference scenarios for the user equipment, that corresponds to the transmission parameters of the interfering base station; and
applying, at the user equipment, interference suppression processing to a signal received in the scheduled time/frequency zone,
wherein applying the interference suppression processing comprises selecting an interference cancellation technique from among a plurality of interference cancellation techniques based on the pre-defined interference scenario and applying the selected cancellation technique to the signal, and
wherein the plurality of interference cancellation techniques comprise two or more of: successive interference cancellation (SIC) processing, interference rejection combining (IRC) processing, and maximum likelihood (ML) interference cancellation.
2. The method of claim 1 , wherein the transmission parameters of the interfering base station are sent to the user equipment using a radio resource control (RRC) channel of the serving base station prior to setting the transmission parameters of the interfering base station in the scheduled time/frequency zone.
3. The method of claim 1 , wherein each of the plurality of pre-defined interference scenarios corresponds to a different set of transmission parameters.
4. The method of claim 3 , wherein the different sets of transmission parameters are sent to the user equipment using a radio resource control (RRC) channel of the serving base station.
5. The method of claim 1 , wherein the plurality of pre-defined interference scenarios for the user equipment are determined based on a geographic location of the user equipment.
6. The method of claim 1 , wherein setting the transmission parameters of the interfering base station comprises:
determining the transmission parameters of the interfering base station in the scheduled time/frequency zone; and
communicating with the interfering base station to set its transmission parameters in the scheduled time/frequency zone to the determined transmission parameters.
7. The method of claim 1 , further comprising:
selecting transmission parameters of the serving base station in the scheduled time/frequency zone to enhance interference suppression at the user equipment in the scheduled time/frequency zone.
8. The method of claim 7 , wherein the set transmission parameters of the interfering base station and the selected transmission parameters of the serving base station correspond to a known combination of transmission parameters favorable to interference suppression at the user equipment.
9. The method of claim 1 , wherein setting the transmission parameters of the interfering base station comprises:
aligning respective pilot signals of the serving base station and the interfering base station in the scheduled time/frequency zone.
10. The method of claim 1 , wherein setting the transmission parameters of the interfering base station comprises:
setting a transmission power level of the interfering base station in the scheduled time/frequency zone to enable the user equipment to decode the interference from the interfering base station in the scheduled time/frequency zone.
11. The method of claim 1 , wherein the transmission parameters of the interfering base station include one or more of: transmission mode (TM), transmission power level, modulation scheme, coding scheme, pilot timing and/or structure, frame structure, and resource allocation mode.
12. A method performed by a base station to assist a user equipment to suppress interference from an interfering base station, comprising:
monitoring transmission parameters of the interfering base station;
scheduling an interference suppression (IS) zone for the user equipment when the transmission parameters of the interfering base station are favorable to interference suppression at the user equipment;
signaling an indication of a pre-defined interference scenario, from among a plurality of pre-defined interference scenarios for the user equipment, that correspond to the transmission parameters of the interfering base station that are favorable to interference suppression at the user equipment; and
applying, at the user equipment, interference suppression processing to a signal received in the scheduled IS zone,
wherein applying the interference suppression processing comprises selecting an interference cancellation technique from among a plurality of interference cancellation techniques based on the pre-defined interference scenario and applying the selected cancellation technique to the signal, and
wherein the plurality of interference cancellation techniques comprise two or more of: successive interference cancellation (SIC) processing, interference rejection combining (IRC) processing, and maximum likelihood (ML) interference cancellation.
13. The method of claim 12 , wherein the transmission parameters of the interfering base station that are favorable to interference suppression at the user equipment are sent to the user equipment using a radio resource control (RRC) channel of the base station.
14. The method of claim 12 , wherein each of the plurality of pre-defined interference scenarios corresponds to a different set of transmission parameters.
15. The method of claim 12 , wherein the plurality of pre-defined interference scenarios for the user equipment are determined based on a geographic location of the user equipment.
16. The method of claim 12 , wherein the transmission parameters of the interfering base station include one or more of: transmission mode (TM), transmission power level, modulation scheme, coding scheme, pilot timing and/or structure, frame structure, and resource allocation mode.
17. A method of interference suppression at a user equipment, comprising:
receiving from a base station an indication of a pre-defined interference scenario, from among a plurality of pre-defined interference scenarios for the user equipment, that corresponds to transmission parameters that are favorable to interference suppression at the user equipment; and
applying, responsive to the received indication of the pre-defined interference scenario, interference suppression processing to a signal received in a time and frequency (time/frequency) zone,
wherein applying the interference suppression processing comprises selecting an interference cancellation technique from among a plurality of interference cancellation techniques based on the pre-defined interference scenario and applying the selected cancellation technique to the signal, and
wherein the plurality of interference cancellation techniques comprise two or more of: successive interference cancellation (SIC) processing, interference rejection combining (IRC) processing, and maximum likelihood (ML) interference cancellation.
18. The method of claim 17 , wherein applying the interference suppression processing further comprises blindly estimating one or more additional transmission parameters based on the pre-defined interference scenario.
19. The method of claim 17 , wherein each of the plurality of pre-defined interference scenarios corresponds to a different set of transmission parameters.
20. The method of claim 17 , wherein the plurality of pre-defined interference scenarios for the user equipment are determined based on a geographic location of the user equipment.