Coordinated Multi-Point Transmission Participant Selection
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Solution Overview
Problem
Coordinated multipoint transmission in wireless communication systems faces challenges due to propagation delay differences between transmission points, which can lead to excessive phase variations and interfere with coherent joint processing, resulting in reduced spectral efficiency and increased interference.
Innovation Solution
A processing system that evaluates propagation delay variations between transmission points and determines whether they are acceptable participants in joint processing transmissions, excluding those with excessive delays to prevent phase variations that exceed the cyclic prefix duration, thereby ensuring effective joint processing coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmission points participate in joint processing transmission, then spectral efficiency is improved through coherent combining gains, but propagation delay differences cause excessive phase variations that degrade transmission quality
Solution Approach 1:
The system segments the set of transmission points into two groups: those whose propagation delay difference with the reference transmission point is within a threshold (acceptable participants) and those whose delay difference exceeds the threshold (excluded participants). This segmentation allows joint processing to be performed only with transmission points that maintain coherent phase relationships, thereby preserving transmission quality while still achieving spectral efficiency improvements through coordinated multi-point transmission.
2Area of stationary object
If transmission points with large propagation delays are included in joint processing, then coverage area is expanded, but phase variations exceed cyclic prefix duration causing loss of coherent combining gains
Solution Approach 1:
The system performs preliminary evaluation of propagation delay differences between the reference transmission point and other transmission points before initiating joint processing transmission. By pre-identifying and excluding transmission points whose delay difference would cause phase variations exceeding the cyclic prefix duration, the system ensures that only transmission points capable of maintaining coherent phase relationships are included, thereby preserving manufacturing precision in the form of phase synchronization precision.
3Strength
If all detectable transmission points are used for joint processing, then signal strength is increased through diversity gain, but channel estimation complexity and interference increase
Solution Approach 1:
The system extracts and excludes transmission points that would contribute excessive propagation delay variations from the joint processing set. By removing these problematic transmission points, the system reduces channel estimation complexity and minimizes interference, while still maintaining sufficient signal strength through coherent combining with the remaining acceptable transmission points that have delay differences within the threshold.
Data Source
AI summary
Systems and techniques for communication using coordinated multi-point transmission. In one embodiment, an apparatus comprises at least one processor and a memory storing a set of computer instructions. The processor is configured to cause the apparatus to receive information relating to a propagation delay variation between at least a first transmission and a second transmission received at a user equipment. The first transmission is received from a first transmission point and the second transmission is received from a second transmission. The information relating to the propagation delay variation is evaluated and, based on the result of the evaluation, a determination is made as to whether the second transmission point is acceptable as a participant in a cooperative multi-point joint processing transmission to the user equipment.