Soft Buffer Management for D2D and WAN Communication
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing buffers for device-to-device (D2D) and wide area network (WAN) communications, particularly in configuring downlink HARQ processes to support D2D communication while maintaining effective E2D communication.
Innovation Solution
A method is proposed where a user equipment (UE) manages a soft buffer by receiving D2D communication data and storing it in a specific downlink HARQ process, discarding existing E2D data if necessary, and configuring the HARQ process to support D2D communication among multiple downlink HARQ processes, with the option to receive redundancy version data from an eNode B.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a specific downlink HARQ process is configured to support D2D communication among multiple downlink HARQ processes, then D2D communication capability is improved, but buffer management complexity increases
Solution Approach 1:
The soft buffer is segmented into multiple downlink HARQ processes, with one specific process designated for D2D communication. This segmentation allows the buffer to handle both traditional WAN communication and D2D communication simultaneously by assigning dedicated storage regions for different communication types, thereby improving adaptability while maintaining manageable complexity through structured organization.
2Quantity of substance
If E2D data previously stored in soft buffer area is discarded to store D2D communication data, then D2D communication data storage is ensured, but E2D communication reliability deteriorates
Solution Approach 1:
The system performs preliminary configuration by designating a specific downlink HARQ process for D2D communication before actual communication occurs. This preliminary action ensures that when D2D data needs to be stored, the designated buffer area is already prepared, and E2D data in that specific area can be discarded without affecting the overall reliability of E2D communication, as other HARQ processes continue to handle E2D traffic normally.
3Reliability
If all soft buffer areas are occupied by E2D data, then E2D communication is maintained, but D2D communication cannot be supported
Solution Approach 1:
The downlink HARQ processes are designed with multi-functionality, where one specific process can serve both traditional E2D communication and D2D communication needs. This universal design allows the buffer to dynamically support D2D communication even when E2D data occupies most buffer areas, as the designated HARQ process for D2D can be utilized without compromising overall E2D communication reliability through the other HARQ processes.
Data Source
AI summary
The present invention relates to a method and apparatus for operating a soft buffer for device-to-device (D2D) communication and eNode B-to-device (E2D) communication of a terminal in a wireless communication system. Specifically, the present invention comprises the steps of: receiving D2D communication data; and storing the D2D communication data in a soft buffer of a specific downlink hybrid automatic repeat and request (HARQ) process, wherein the specific downlink HARQ process is configured to support D2D communication among a plurality of downlink HARQ processes configured for E2D communication, and the step of storing the D2D communication data comprises: when E2D data are already stored in all soft buffer areas associated with the plurality of downlink HARQ processes, discarding the E2D data already stored in the soft buffer area of the specific downlink HARQ process and storing the D2D communication data therein.