RNTI Subsets for Inter-Cell Interference Cancellation
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Solution Overview
Problem
Current methods for mitigating inter-cell interference in wireless communication systems are computationally intensive, particularly when using Radio Network Temporary Identifications (RNTIs), and require inefficient blind detection to identify interfering UEs in neighboring cells.
Innovation Solution
The method involves managing RNTIs by dividing them into subsets based on UE attributes, allocating specific RNTIs to UEs likely to cause interference, and implicitly broadcasting these RNTIs to reduce interference detection complexity, allowing for efficient interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RNTIs are used for inter-cell interference cancellation, then interference mitigation capability is improved, but computational complexity increases
Solution Approach 1:
The patent divides the RNTI space into multiple subsets, where each subset is assigned to specific interfering UEs in neighboring cells. This segmentation allows the serving UE to focus detection efforts on only the relevant RNTI subsets rather than searching through all possible RNTIs, thereby reducing computational complexity while maintaining interference cancellation capability
Solution Approach 2:
The patent applies different RNTI subset allocations to different spatial locations (neighboring cells) and different UE groups. By tailoring the RNTI subset configuration to local interference conditions rather than using a uniform approach, the system achieves effective interference mitigation with reduced detection burden in each specific scenario
2Measurement precision
If blind detection is used to identify interfering UEs, then interference identification capability is improved, but detection efficiency deteriorates
Solution Approach 1:
The patent performs preliminary action by pre-configuring and broadcasting RNTI subsets to UEs before interference detection is needed. The serving UE receives advance information about which RNTI subsets to monitor, eliminating the need for exhaustive blind detection and significantly improving detection efficiency while maintaining accurate interference identification
3Measurement precision
If all RNTIs are broadcast to UEs, then interference detection accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts and broadcasts only the relevant RNTI subsets that are actually needed for interference detection in each scenario, rather than broadcasting all possible RNTIs. This selective extraction approach maintains interference detection accuracy by providing the necessary RNTI information while significantly reducing signaling overhead by excluding unnecessary RNTIs from the broadcast
Data Source
AI summary
A method and system facilitate inter-cell interference cancellation in a wireless network. An RNTI component manages a set of radio network temporary identifiers (RNTIs) for a plurality of user equipment (UE). The RNTI component determines whether the UEs will likely cause interference with a neighboring cell and/or experience interference from a neighboring cell, based on a respective attribute of the UEs. The RNTI component includes a space splitting component that divides the set of RNTIs into at least two subsets based on the determination, and allocates a first group of the UEs that are determined to likely cause interference and/or experience interference to a first subset of the divided RNTIs, such that the UEs in the first group are allocated a corresponding one of the RNTIs among the first subset of RNTIs. An implicit broadcast component can implicitly broadcast the first subset of RNTIs to facilitate cancellation of interference possibly caused by the first group of UEs.