CoMP Starting Symbol Index Signaling for CRS Configuration
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Solution Overview
Problem
In Coordinated Multi-Point (CoMP) communication systems, the varying reference signal (CRS) parameters and PDSCH rate matching dependencies across different base stations complicate efficient data transmission, leading to issues with CRS configuration, fallback, ePDCCH, and interference measurement.
Innovation Solution
The system introduces mechanisms for implicit signaling of CRS parameters, dynamic rate matching based on CSI-RS configurations, and flexible subframe-dependent resource allocation to optimize CoMP transmission, allowing for efficient use of data resources and reduced overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Coordinated Multi-Point (CoMP) communication is implemented with multiple base stations, then system spectral efficiency and transmission quality are improved, but CRS parameter configuration complexity and interference management difficulty increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting CRS parameters (such as frequency shift, antenna port, and resource element positions) based on the specific CoMP transmission scenario. The system configures different CRS parameter sets for different base stations participating in CoMP, allowing each station to optimize its reference signal configuration according to its role (serving cell, neighboring cell, interference measurement cell) while maintaining overall system coordination and spectral efficiency.
2Adaptability or versatility
If dynamic rate matching based on CSI-RS configurations is used, then resource allocation flexibility is improved, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent implements preliminary action by pre-configuring rate matching patterns and CSI-RS resource configurations through higher-layer signaling (RRC) before actual data transmission. The system establishes predetermined rate matching rules that map CSI-RS resources to PDSCH resource allocations, allowing the UE to perform rate matching based on pre-known configurations rather than requiring dynamic signaling for each transmission, thus reducing signaling overhead while maintaining flexibility.
Solution Approach 2:
The patent uses rate matching patterns as an intermediary mechanism that bridges CSI-RS configurations and PDSCH resource allocation. The rate matching pattern serves as a mapping rule that translates CSI-RS resource indications into concrete PDSCH resource element assignments, allowing the system to achieve flexible resource allocation without directly signaling every detail of the resource mapping, thereby reducing signaling overhead.
3Productivity
If implicit signaling mechanisms are introduced for CRS parameters, then configuration efficiency is improved, but ambiguity in parameter interpretation may increase
Solution Approach 1:
The patent applies self-service by enabling the UE to autonomously determine CRS parameters through implicit signaling mechanisms. The system configures the UE with reference signal configurations and rate matching patterns that allow the UE to self-derive CRS parameters (such as frequency shift and antenna port) based on pre-configured rules and observed signals, reducing network signaling overhead while maintaining unambiguous parameter interpretation through standardized derivation algorithms.
Data Source
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AI summary
Certain aspects of the present disclosure relate to methods and apparatus for Coordinated Multipoint (CoMP) communications. Certain aspects relate to methods and apparatus for determining a starting symbol index for downlink transmission.