Physical Cell Identifier Allocation for Interference Reduction
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Solution Overview
Problem
Existing methods for allocating physical cell identifiers in TD-LTE systems do not effectively reduce interference between reference signals from adjacent cells, as they rely on network topology priorities which may not accurately identify the cells with the strongest interference.
Innovation Solution
A method and apparatus that determine cell wireless measurement index information to identify co-channel interference sampling points, classify adjacent cells by the remainder of their physical cell identifiers MOD 3, and allocate a physical cell identifier based on the minimum interference degree to minimize reference signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If physical cell identifiers are allocated based on network topology priorities (distance, direction angle, simulated overlapping coverage), then the allocation process is simplified and can be implemented easily, but the interference between reference signals from adjacent cells cannot be effectively reduced because the closest cells may not be the cells with strongest interference due to topography, building, transmitted power and other factors
Solution Approach 1:
The patent changes the basis for priority determination from static network topology parameters (distance, angle) to dynamic wireless measurement parameters (RSRP, SINR). This allows the system to adapt to actual interference conditions caused by topography, buildings, and transmitted power variations, effectively reducing reference signal interference while maintaining implementation feasibility through standardized measurement procedures
Solution Approach 2:
The patent replaces the mechanical/geometric approach (based on physical distance and spatial relationships) with a signal-based approach (using RSRP and SINR measurements). This substitution allows the system to directly measure and respond to actual interference conditions rather than relying on theoretical spatial relationships, thereby effectively identifying and mitigating the strongest interference sources
2Device complexity
If physical cell identifiers are allocated to avoid identical remainders MOD 3 for the three closest adjacent cells, then the allocation method is straightforward and computationally simple, but the requirement of interference-minimum between reference signals may not be satisfied when the closest cells are not the cells with strongest interference
Solution Approach 1:
The patent changes the selection criteria from topological parameters to wireless measurement parameters (RSRP, SINR), enabling the system to identify the three adjacent cells with strongest actual interference rather than merely the closest cells. This parameter change maintains algorithmic simplicity while dramatically improving interference reduction effectiveness
Solution Approach 2:
The patent introduces feedback mechanisms where the system continuously measures wireless signals (RSRP, SINR) from adjacent cells and uses these measurements to dynamically determine allocation priorities. This feedback loop ensures that the allocation decision is based on actual interference conditions, improving reliability while keeping the algorithm complexity manageable through standardized measurement and ranking procedures
Data Source
AI summary
The present invention relates to the technical field of wireless communications. Disclosed are a physical cell identifier allocation method and an apparatus. In a scheme, when allocating a physical cell identifier, first determining a degree of interference of each type of an adjacent cell to a main cell for which a physical cell identifier needs to be allocated, and then performing allocation for the main cell based on a remainder value corresponding to a minimum degree of interference, thus implementing effective reduction of reference signal interference and improving effectiveness of reducing reference signal interference.