Semi-Static Resource Allocation for CoMP Transmission Overhead
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Solution Overview
Problem
Current wireless communication networks face challenges in efficiently coordinating multi-point transmissions in LTE-Advanced systems, leading to increased overhead and complexity due to dynamic resource allocation for CoMP (Coordinated MultiPoint) techniques.
Innovation Solution
Implementing a semi-static configuration for resource allocation among cells, where a set of cells determines and shares a stable set of resource elements for CoMP transmission, reducing overhead and complexity by minimizing frequent updates and aligning cell-specific and UE-specific reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic resource allocation is used for CoMP transmission, then transmission flexibility is improved, but overhead and system complexity increase
Solution Approach 1:
The patent applies dynamics by transitioning from fully dynamic resource allocation to semi-static configuration. The available resource elements are determined dynamically based on cell-specific reference signal positions and TDM control symbol requirements, but once determined, the configuration remains stable across multiple subframes. This partial dynamic approach maintains transmission flexibility while reducing continuous reconfiguration overhead.
Solution Approach 2:
The patent implements preliminary action by pre-determining the semi-static configuration of available resource elements before actual CoMP transmission occurs. The configuration is established based on predetermined rules regarding cell-specific reference signals and control symbols, allowing the system to avoid continuous real-time calculations during active transmission and thereby reduce overhead and complexity.
2Device complexity
If semi-static configuration is used for CoMP transmission, then overhead and complexity are reduced, but transmission adaptability decreases
Solution Approach 1:
The patent resolves this contradiction by implementing a hybrid approach where the semi-static configuration is not completely fixed but is dynamically adjusted based on cell-specific reference signal positions and TDM control symbol requirements. This allows the system to maintain adaptability where needed while enjoying the benefits of reduced overhead during stable transmission periods.
3Device complexity
If cell-specific reference signals are transmitted on aligned resource elements, then overhead is reduced, but signal interference may increase
Solution Approach 1:
The patent applies local quality by allowing different cells to transmit their reference signals on the same resource elements only when necessary and when they do not interfere with each other. The system dynamically determines which resource elements can be shared and which must be separated based on actual transmission conditions, providing localized optimization rather than uniform treatment across all cells.
Data Source
AI summary
Techniques for supporting Coordinated MultiPoint (CoMP) transmission are described. For CoMP transmission, multiple cells may simultaneously send one or more data streams to one or more UEs on the same time-frequency resources based on short-term channel feedback from at least one UE to at least two cells. In an aspect, a semi-static configuration may be used by a set of cells for CoMP transmission to a UE. The semi-static configuration may indicate resource elements available to the set of cells to send CoMP transmission to the UE. The available resource elements may be determined based on a maximum number of TDM control symbols for all cells in the set and resource elements used for cell-specific reference signals by the cells in the set. A cell in the set may send data on the available resource elements to the UE for the CoMP transmission.