Interference Management in Cellular Networks Using Location-Based Aggressor Identification
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Solution Overview
Problem
Current cellular communication networks face challenges in managing cross-link interference (CLI) at cell edges, particularly when user equipment (UEs) are close to each other, leading to deterioration in communication quality and making flexible Time Division Duplex (TDD) hard to implement, as existing methods either consume UE battery resources or increase signaling and computational complexity.
Innovation Solution
A method where base stations cooperate to identify and report only the interfering UEs (aggressor UEs) to the victim UE, reducing the number of UEs that need to perform interference measurements by defining a 'hot zone' around the victim UE based on geographical location and timing differences, thereby minimizing computational and signaling costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the victim UE performs interference measurements on all neighboring UEs, then the interference management becomes comprehensive, but the computational complexity and signaling overhead increase significantly
Solution Approach 1:
The patent extracts only the relevant interfering UEs (aggressor UEs) from the set of all neighboring UEs by using location information and timing advance values to identify which UEs are actually causing interference. This extraction principle reduces the measurement set from all neighboring UEs to only those UEs that are geographically and temporally relevant, thereby reducing computational complexity while maintaining interference management effectiveness.
Solution Approach 2:
The patent applies local quality by making the interference measurement requirement location-dependent. UEs that are geographically close to the victim UE and have timing advance values indicating potential interference are identified as aggressor UEs that require measurement. This localized approach ensures that only UEs in the relevant spatial and temporal context are measured, reducing overall computational burden.
2Reliability
If the victim UE performs interference measurements on all neighboring UEs, then the interference management becomes comprehensive, but the signaling overhead increases significantly
Solution Approach 1:
The patent extracts and transmits only the necessary information (location information and timing advance values) to identify aggressor UEs, rather than requiring signaling for all neighboring UEs. This reduces signaling overhead by filtering out UEs that do not pose an interference risk.
Solution Approach 2:
The patent performs preliminary identification of aggressor UEs using location information and timing advance values before the actual interference measurement process. This preliminary action allows the network to pre-filter the set of UEs that need to be measured, reducing the signaling overhead required during the measurement and reporting phases.
3Measurement precision
If base stations exchange location information and timing advance values, then the identification of aggressor UEs becomes accurate, but the signaling overhead increases
Solution Approach 1:
The patent uses location information and timing advance values to create a localized identification criterion for aggressor UEs. By combining spatial (location) and temporal (timing advance) information, the system achieves accurate identification of UEs that are both geographically close and temporally aligned to cause interference, while avoiding unnecessary signaling for UEs that fail either criterion.
Solution Approach 2:
The patent changes the identification parameters from simple neighboring UE lists to a composite criterion based on location information and timing advance values. This parameter change enables more precise identification of aggressor UEs by filtering based on multiple dimensions (spatial and temporal), improving accuracy while the selective nature of the filtering reduces overall signaling overhead.
Data Source
AI summary
A method for identifying potentially interfering devices is provided. The method may include receiving, by a first base station, an information element comprising information for identifying location of a first device with respect to the first base station, and sending a request to a second base station. The request may include location information on the basis of the received information element. The method may include receiving, in response to the request, an identifier of at least one further device, and transmitting the identifier of the at least one further device to the first device for interference measurements.