Reference Signal Cyclic Shift Hopping for Inter-Cell Interference Reduction
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Solution Overview
Problem
In the combination of CoMP technology and RS hopping, inter-cell interference is not adequately randomized, leading to strong interference between UEs in coordinated cells, which reduces reception performance.
Innovation Solution
Ensuring that reference signals from multiple UEs use the same cyclic shift hopping rule, coordinated between serving and coordinated cells through control information, to maintain orthogonality and enhance signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If different cyclic shifts are allocated to different UEs to ensure orthogonality of reference signals, then orthogonality between reference signals is improved, but inter-cell interference randomization is reduced leading to strong interference in coordinated cells
Solution Approach 1:
The patent applies dynamics by making the cyclic shift value time-varying through hopping sequences. Instead of allocating a fixed cyclic shift to each UE, the cyclic shift changes over time according to a hopping rule, allowing the system to dynamically adjust orthogonality and interference characteristics across different time slots
Solution Approach 2:
The patent implements periodic action through cyclic shift hopping where the cyclic shift value periodically changes according to a predefined hopping sequence. This periodic variation in cyclic shift values enables both orthogonality maintenance and interference randomization across different time slots
2Object-affected harmful factors
If RS hopping technology is introduced to randomize inter-cell interference, then inter-cell interference randomization is improved, but orthogonality between reference signals from multiple UEs is reduced causing strong interference in coordinated cells
Solution Approach 1:
The patent applies local quality by differentiating the hopping behavior between serving cell and coordinated cell. The terminal uses a first hopping rule for the serving cell to maintain orthogonality, while using a second hopping rule for the coordinated cell to achieve interference randomization, allowing each cell to optimize for its specific function
Solution Approach 2:
The patent implements parameter changes by modifying the cyclic shift parameter according to different hopping rules for different cells. The cyclic shift value changes over time with different patterns for serving and coordinated cells, enabling simultaneous achievement of orthogonality and interference randomization through parameter variation
Data Source
AI summary
The present invention relates to a method for generating a reference signal, including: obtaining first control information, where the first control information indicates or includes cyclic shift related information which is used by a terminal belonging to a serving cell to send a reference signal; and sending the first control information to the terminal belonging to the serving cell, so that the terminal belonging to the serving cell generates the reference signal according to the cyclic shift related information which is indicated or included by the first control information and used by the terminal to send the reference signal, where a variation rule of a cyclic shift which the terminal belonging to the serving cell uses to generate the reference signal is the same as that of a cyclic shift which a terminal belonging to a coordinated cell uses to generate the reference signal.