D2D Control Signal Mapping to Reference Symbols
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Solution Overview
Problem
In Device to Device (D2D) communication systems, there is a need for efficient transmission and reception of control signals between User Equipments (UEs) without relying on an eNodeB, particularly in allocating control information to a D2D resource region effectively to improve data reception and demodulation performance.
Innovation Solution
A method is provided where D2D control information, including Modulation and Coding Scheme (MCS) and Hybrid Automatic Retransmission Request (HARQ) related information, is mapped to a D2D resource region, with higher priority mapping adjacent to reference signal symbols, and multiplexed through puncturing and rate matching, ensuring efficient transmission and reception of control signals between UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If D2D control information is mapped to symbols adjacent to reference signal symbols, then data reception and demodulation performance is improved, but resource allocation complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining the mapping rule that D2D control information shall be mapped to symbols adjacent to reference signal symbols. This predetermined arrangement eliminates the need for complex real-time resource allocation decisions, as the mapping positions are established in advance based on reference signal locations, thereby improving demodulation performance while controlling complexity through rule-based automation.
2Productivity
If multiple D2D control information fields are multiplexed through puncturing and rate matching, then control signal transmission efficiency is improved, but processing complexity increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the mapping parameters of D2D control information based on the specific combination of fields to be transmitted. Different parameter sets (such as mapping positions, puncturing patterns, and rate matching factors) are selected according to the content and priority of control information fields, enabling efficient multiplexing while managing processing complexity through parameter-based adaptation rather than complex algorithmic processing.
3Adaptability or versatility
If D2D control information is mapped away from reference signal symbols, then resource utilization flexibility increases, but data reception performance deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the mapping strategy for different types of D2D control information fields. High-priority fields (such as HARQ ACK/NACK) are mapped to symbols adjacent to reference signal symbols to ensure reliable reception, while lower-priority fields can be mapped to other available symbols. This localized optimization approach maintains data reception performance for critical information while providing flexibility for non-critical control information.
Data Source
AI summary
One embodiment of the present invention discloses a method for transmitting a control signal for device-to-device (D2D) communication with a second terminal by a first terminal in a wireless communication system, wherein the method is carried out by the first terminal and comprises the steps of: mapping control information for the D2D communication to a resource region for the D2D communication; and transmitting, to the second terminal, the mapped control information for the D2D communication with data for the D2D communication, wherein the control information for the D2D communication includes modulation and coding scheme (MCS) related information and hybrid automatic retransmission request (HARQ) related information, and the control information for the D2D communication can be mapped to at least one symbol except for symbol(s) to which a reference signal is mapped.