Rate Matching in Coordinated Multi-Point Radio Systems
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Solution Overview
Problem
In the LTE-A system, user terminals face challenges in performing rate matching when downlink signals are transmitted from multiple transmission points, as existing methods do not adequately account for the coordination of control signals and reference signals from multiple base stations, leading to inefficiencies in resource allocation and interference management.
Innovation Solution
A radio communication system is developed that enables coordinated multi-point transmission and reception between multiple radio base stations, where each base station transmits downlink control information including a rate matching pattern, and the user terminal performs rate matching based on a combination of cell-specific reference signal and interference measurement reference signal patterns, using MBSFN subframes or new carrier types, to aggregate and process signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If downlink signals are transmitted from multiple transmission points to improve throughput performance, then system capacity and coverage are improved, but rate matching complexity and interference management difficulty increase
Solution Approach 1:
The patent segments the rate matching process by introducing separate indication information for different transmission points. Each transmission point's control signals and reference signals are handled independently through dedicated indication bits, allowing the user terminal to perform rate matching for each point separately rather than managing all signals in a single complex process.
Solution Approach 2:
The patent adds a new dimension to rate matching by introducing transmission point-specific indication information in the downlink control information. This additional dimension allows the system to distinguish between signals from different transmission points, enabling independent rate matching decisions for each point while maintaining overall system coordination.
2Productivity
If downlink signals are transmitted from multiple transmission points to enhance coverage and capacity, then system performance is improved, but interference management becomes more difficult
Solution Approach 1:
The patent implements feedback mechanisms where the network indicates to the user terminal which transmission points are active and what their respective signal characteristics are. This feedback allows the user terminal to adapt its reception strategy by identifying and avoiding resources occupied by control signals and reference signals from different transmission points, thereby reducing interference.
Solution Approach 2:
The downlink control information serves as an intermediary that carries indication information about multiple transmission points. This intermediary provides the user terminal with knowledge about the transmission environment, enabling it to perform rate matching that accounts for interference from different sources without requiring direct coordination between all transmission points and the terminal.
3Manufacturing precision
If rate matching is performed considering control signals and reference signals from multiple transmission points, then resource allocation accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent segments the resource allocation process by providing separate indication information for each transmission point's control signals and reference signals. The user terminal processes each transmission point's resource requirements independently based on the received indication bits, achieving accurate resource allocation without requiring a single complex processing step that considers all transmission points simultaneously.
Data Source
AI summary
To perform rate matching appropriately even when downlink signals are transmitted from a plurality of transmission points to a user terminal, a radio communication system having a user terminal capable of coordinate multi-point transmission and reception with several radio base stations is provided. A radio base station transmits downlink control information including bit information defining a predetermined rate matching pattern to the user terminal. The user terminal receives the downlink control information and performs rate matching based on the bit information defining the rate matching pattern. A combination of a cell-specific reference signal pattern and an interference measurement reference signal pattern in the case of transmission from several radio base stations each using an MBSFN subframe or NCT is defined in predetermined bits. The user terminal performs rate matching based on the bit information and the subframe configuration and interference measurement reference signal pattern of the radio base station.