EPDCCH Downlink Control Information Reception via Reference Signal Puncturing
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, there is a challenge in efficiently receiving downlink control information by user equipment (UE) due to complexities in initial access procedures and interference from legacy cells, which affects the accuracy and efficiency of channel measurement and control channel decoding.
Innovation Solution
The method involves using a puncturing (PC) or rate matching (RM) scheme for specific reference signals in the enhanced physical downlink control channel (EPDCCH) based on the UE's location during the initial access procedure, and configuring the start OFDM symbol location for efficient control information reception, allowing for blind decoding and reduced interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a common search space (CSS) is used for enhanced physical downlink control channel (EPDCCH) in initial access procedure, then downlink control information can be transmitted to multiple UEs, but interference from legacy cells and location-specific issues affect reception accuracy
Solution Approach 1:
The patent segments the CSS into multiple regions, each associated with different reference signal locations. UEs are directed to specific regions based on their location or configuration, allowing tailored reference signal reception that avoids interference from legacy cells while maintaining efficient multi-UE service
Solution Approach 2:
Different reference signal locations are assigned to different UE locations or configurations within the CSS. This local differentiation ensures that each UE receives reference signals optimized for its specific position, improving channel measurement accuracy while maintaining overall system productivity
2Measurement precision
If reference signals are transmitted using puncturing scheme for location-specific UEs, then channel measurement accuracy improves, but device complexity increases due to multiple transmission schemes
Solution Approach 1:
The system dynamically selects between puncturing and rate matching schemes based on UE location and configuration. This dynamic adaptation allows the system to achieve high measurement precision for location-specific UEs while avoiding unnecessary complexity for other UEs, as each UE experiences only the scheme appropriate for its situation
3Adaptability or versatility
If blind decoding is performed for EPDCCH reception, then downlink control information can be received without prior location knowledge, but reception time and processing complexity increase
Solution Approach 1:
The patent configures UEs with preliminary information about EPDCCH search space locations and reference signal positions before actual reception. This preliminary configuration enables UEs to narrow down their search scope, maintaining adaptability for initial access while significantly reducing the time and processing required for blind decoding compared to unrestricted searching
Data Source
AI summary
The present invention relates to a method by which a terminal receives downlink control information in a wireless communication system and, more specifically, the method comprises the step of receiving a specific reference signal (RS) in a common search space (CSS) of an enhanced physical downlink control channel (EPDCCH), wherein the specific reference signal is punctured and transmitted when a position allocated to a first terminal in an initial access procedure cannot be commonly applied to a second terminal.