CoMP Reference Signal Interference Reduction
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Solution Overview
Problem
In wireless communication systems, the generation of reference signals for CoMP (cooperative multi-point) schemes can lead to degradation of communication performance due to different reference signal sequences and patterns between multiple cells, causing interference and inaccurate channel estimation in multi-cell environments.
Innovation Solution
The method involves generating and transmitting the same CoMP reference signal sequence and pattern across cells belonging to a CoMP set, using specific resource regions and formulas to ensure consistency, such as Formula 1 and Formula 2, which account for cell IDs and frequency shifts, to minimize interference and enhance channel estimation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If different reference signal sequences and patterns are used between multiple cells, then each cell can independently identify its reference signals, but inter-cell interference increases and channel estimation accuracy degrades
Solution Approach 1:
The patent applies local quality by configuring reference signal parameters (cyclic shifts, orthogonal cover codes, resource element positions) differently in different spatial locations or cell groups. Specifically, cells within the same CoMP set use identical reference signal sequences and patterns, while cells outside the CoMP set use different configurations. This localized differentiation reduces inter-cell interference for CoMP operations while maintaining independent identification capability across the network.
Solution Approach 2:
The patent segments the network into distinct CoMP sets, where each set is a group of cells that coordinate their reference signal transmission. By dividing the network into these segments, the system enables coherent joint processing within each segment while managing interference between segments through differentiated reference signal configurations.
2Adaptability or versatility
If different reference signal sequences are used between multiple cells, then each cell maintains its own signal characteristics, but channel estimation accuracy degrades in multi-cell environments
Solution Approach 1:
The patent applies homogeneity by making reference signal sequences and patterns identical across all cells within a CoMP set. This uniform configuration enables the user equipment to perform accurate channel estimation by comparing received reference signals against known sequences from multiple base stations. The homogeneous reference signal design within CoMP sets allows coherent joint processing while cell-specific characteristics are maintained through selective application to different CoMP sets.
3Object-affected harmful factors
If the same reference signal sequence is transmitted across multiple cells in a CoMP set, then inter-cell interference is reduced, but coordination complexity between base stations increases
Solution Approach 1:
The patent applies universality by establishing standardized reference signal configurations that can be applied across multiple cells in a CoMP set. The same reference signal sequences, cyclic shifts, and resource element patterns are universally deployed within each CoMP set, enabling coherent joint processing without requiring complex cell-specific adaptations. This universal approach simplifies coordination by providing a common framework that reduces interference while maintaining manageability.
Data Source
AI summary
A method of generating reference signals by a base station in a wireless communication system is disclosed. The method including a sequence of a first reference signal using a cell identifier of the base station, transmitting, to a first user equipment (UE), a message including mode information indicating a first mode for a coordinated multi-point (CoMP) operation and a predetermined identifier being different from the cell identifier of the base station and generating a sequence of a second reference signal for the first UE using the predetermined identifier instead of the cell identifier of the base station.