Reference Signal Pattern Overlap Handling in Wireless Systems
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Solution Overview
Problem
In complex wireless communication systems, especially those with multi-antenna and multi-cell transmissions, it becomes challenging to find suitable reference symbol patterns that do not collide with other patterns, affecting the demodulation of data symbols.
Innovation Solution
The method involves identifying overlapping resource elements in a resource block by comparing different reference symbol patterns and transmitting them only when the same antenna ports are allocated, while bypassing transmission when different antenna ports are used, and modifying the pattern by removing or shifting resource elements to avoid collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of reference symbols is increased to support more antenna ports and radio channels, then the ability to demodulate data symbols is improved, but the complexity of finding non-colliding reference symbol patterns becomes difficult
Solution Approach 1:
The patent segments reference symbols into different types (first reference symbols for demodulation, second reference symbols for other purposes) with different priorities. By segmenting the resource elements and applying different handling rules to different segments, the system can accommodate more antenna ports while maintaining clear pattern definitions for critical demodulation references.
Solution Approach 2:
The patent applies different quality rules to different resource elements based on their location and purpose. First reference symbols (critical for demodulation) are protected from collision by removing overlapping resource elements, while second reference symbols can share resource elements when they don't interfere with first reference symbols. This local differentiation allows higher overall system capacity.
2Adaptability or versatility
If reference symbol patterns are allocated to different antenna ports, then multi-antenna transmission is enabled, but resource element collisions between patterns occur
Solution Approach 1:
The patent performs preliminary identification of overlapping resource elements between different reference symbol patterns before transmission. By detecting collisions in advance and removing overlapping resource elements from first reference symbol patterns, the system prevents harmful collisions from occurring, enabling reliable multi-antenna transmission.
Solution Approach 2:
The patent introduces an intermediary mechanism that compares resource element patterns and identifies overlaps. This intermediary process acts as a mediator between different antenna port requirements, resolving conflicts by selectively removing overlapping elements while preserving non-colliding patterns for transmission.
3Reliability
If overlapping resource elements are removed from first reference symbol patterns, then collisions are avoided, but symbol energy is reduced
Solution Approach 1:
The patent changes the parameter of resource element allocation dynamically based on collision detection. When overlaps are detected between first and second reference symbol patterns, the system modifies the first pattern by removing overlapping elements. This parameter change prioritizes collision avoidance while the system compensates for energy loss through other means.
Data Source
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AI summary
The present application describes embodiments of methods and apparatuses that may be used to accommodate different reference symbol patterns. One embodiment of the method includes identifying overlapping resource element(s) in a resource block by comparing a first pattern of resource elements associated with first reference symbols to a second pattern of resource elements associated with second reference symbols. This embodiment also includes transmitting the first and second reference symbols in the overlapping resource element(s) when first and second antenna ports allocated for transmission of the first and second reference symbols in the overlapping resource element(s) are the same. Transmission of the first reference symbol in the overlapping resource elements is bypassed when the first and second antenna ports are different.