NAICS Signaling Using Interference RNTIs for Resource Allocation
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Solution Overview
Problem
Conventional network-assisted interference cancellation and suppression (NAICS) methods face challenges in efficiently canceling interference due to lack of resource allocation information for interference PDSCH, leading to degraded performance and restricted scheduling, especially in scenarios where interference and desired signals have different resource allocations and dynamic changes.
Innovation Solution
The method involves determining and signaling transmission information for interference sources to user equipment (UE) using interference radio network temporary identities (RNTIs), allowing UE to cancel interference by receiving semi-static and dynamic information, which includes resource allocation details, and using code states to differentiate between interference and base station transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resource allocation information for interference PDSCH is indicated using many bits, then interference cancellation performance is improved, but downlink control information capacity is exceeded
Solution Approach 1:
The resource allocation information is segmented into two parts: semi-static information (configured via RRC signaling) and dynamic information (transmitted via PDCCH/EPDCCH). This segmentation allows the majority of information to be transmitted efficiently while only essential dynamic updates require control channel resources.
Solution Approach 2:
Semi-static resource allocation information is pre-configured to the UE via RRC signaling before actual data transmission. This preliminary action reduces the amount of information that needs to be transmitted dynamically, thereby reducing the control information burden while maintaining interference cancellation capability.
2Loss of information
If RRC configuration based solution is used for resource allocation, then information can be transmitted, but response speed is too slow for dynamic changes
Solution Approach 1:
The system combines semi-static RRC configuration with dynamic PDCCH/EPDCCH updates. The RRC configuration provides a stable baseline, while the PDCCH/EPDCCH enables rapid dynamic adjustments, achieving both information completeness and fast response to changing interference conditions.
Solution Approach 2:
The PDCCH/EPDCCH acts as an intermediary between the slow RRC configuration layer and the fast dynamic interference changes. It receives updates from the network and quickly communicates resource allocation changes to the UE, bridging the speed gap between RRC and real-time requirements.
3Reliability
If UE searches DCI masked by multiple RNTIs in each group, then interference sources can be identified, but blind decoding complexity increases significantly
Solution Approach 1:
RNTI space is segmented into different groups, with each group associated with specific interference sources or cell types. The UE is configured to monitor only relevant RNTI groups based on its service requirements, reducing the total number of blind decodings while maintaining comprehensive interference source identification capability.
Solution Approach 2:
The DCI format is designed with universal fields that can be interpreted differently based on the masking RNTI type. A single DCI structure serves multiple functions by working with different RNTI groups, reducing the need for separate DCI formats and reducing overall blind decoding complexity.
Data Source
AI summary
Signaling Designs for Network Assisted Interference Cancellation and Suppression Signaling can be valuable in connection with addressing issues of interference. Signaling designs may be valuable, for example, in network-assisted interference cancellation and suppression. A method can include determining transmission information for at least one interference source for a user equipment of a base station. The method can also include signaling the user equipment about the transmission information for the at least one interference source. The transmission information can be configured to facilitate a receiver of the user equipment to cancel interference from the at least one interference source.