Sounding Reference Signal Configuration for D2D Cellular Compatibility
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Solution Overview
Problem
The introduction of Device-to-Device (D2D) communication into cellular systems poses challenges in configuring and transmitting reference signals, particularly for channel state information measurement, which is essential for scheduling, as existing solutions do not adequately address this issue.
Innovation Solution
A method and system for transmitting Sounding Reference Signal (SRS) configuration information sets to User Equipment (UE), including first and second SRS configurations for cellular uplink and D2D links, respectively, to facilitate channel measurement during D2D communication, with specific parameters like bandwidth, subframe configuration, and power offset, ensuring compatibility with cellular communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D communication is introduced into cellular systems, then service transmission efficiency between nearby users is improved and spectrum resources are saved, but the complexity of reference signal configuration and transmission increases
Solution Approach 1:
The patent segments the reference signal configuration into two distinct parts: one for cellular uplink communication and another for D2D communication. This segmentation allows each configuration to be optimized independently for its specific communication mode, resolving the complexity issue by providing structured, separate configuration parameters for cellular and D2D scenarios.
Solution Approach 2:
The patent creates a universal reference signal configuration framework that can serve both cellular uplink and D2D communication modes. The configuration information set is designed to be multi-functional, supporting different communication scenarios through a unified structure that adapts to both cellular and direct device communication requirements.
2Measurement precision
If separate reference signal configurations are provided for cellular and D2D communication, then channel measurement accuracy is improved, but the amount of configuration information increases
Solution Approach 1:
The patent merges the configuration mechanisms for cellular and D2D reference signals into a unified configuration information set transmitted from the network node. By combining the configuration approaches and using a shared transmission mechanism, the patent reduces the overall configuration overhead while maintaining separate functional configurations for accurate channel measurement in both communication modes.
Data Source
AI summary
Methods, devices and a system for transmitting an SRS and a UE are provided. A network node transmits an SRS configuration information set to a UE, wherein the SRS configuration information set includes first configuration information indicating the configuration of a first SRS and second configuration information indicating the configuration of a second SRS, wherein the first SRS is transmitted on a cellular uplink and used for performing uplink channel measurement during cellular communication; and the second SRS is transmitted on a D2D link and used for performing channel measurement of the D2D link during D2D communication. The solution addresses the problem of the configuration and the transmission of a reference signal existing in the conventional art when D2D communication is introduced into a cellular system, realizes the compatibility of D2D communication with cellular communication and avoids the noticeable increase in UE design and realization complexity.