Soft Buffer Reestablishment for D2D HARQ Resource Allocation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing buffers for device-to-device (D2D) communication, particularly in optimizing radio resource allocation and soft buffer sizing for hybrid automatic repeat request (HARQ) processes between eNB-to-device (eNB2D) and D2D communication.
Innovation Solution
A method and apparatus for transmitting and receiving D2D signals based on HARQ, where allocation information is used to set radio resources for a second HARQ process, allowing for dynamic soft buffer sizing linked to the first HARQ process, and adjusting buffer sizes based on communication load and system bandwidth ratios, enabling efficient operation of HARQ buffers for D2D communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radio resources for eNB2D HARQ processes are allocated to D2D HARQ processes, then D2D communication capability is improved, but the buffer management complexity and resource allocation overhead increase
Solution Approach 1:
The patent merges the soft buffers of eNB2D HARQ processes into a shared D2D soft buffer. Specifically, when radio resources for eNB2D HARQ processes are allocated to D2D communication, the soft buffers associated with those eNB2D processes are combined to form the soft buffer for D2D HARQ processes, enabling efficient buffer utilization without requiring separate dedicated buffers for D2D communication
Solution Approach 2:
The patent creates a universal soft buffer structure that can serve multiple purposes. The D2D soft buffer can function as either a dedicated D2D buffer or a combined buffer incorporating eNB2D HARQ buffers depending on resource allocation conditions. This multi-functionality allows the same buffer structure to adapt to different communication modes (eNB2D and D2D) without increasing overall system complexity
2Ease of operation
If separate soft buffers are allocated for eNB2D and D2D HARQ processes, then buffer management is simplified, but radio resource utilization efficiency decreases
Solution Approach 1:
The patent implements a dynamic buffer allocation mechanism where the composition of the D2D soft buffer changes based on resource allocation conditions. When eNB2D HARQ radio resources are allocated to D2D processes, the D2D soft buffer dynamically incorporates those eNB2D buffers. This dynamic adjustment optimizes radio resource utilization by ensuring that allocated buffers are actively used for their intended purpose while maintaining clear buffer management through defined composition rules
Data Source
AI summary
A method for a terminal transmitting/receiving a signal with device-to-device (D2D) on the basis of a hybrid automatic repeat and request (HARQ) in a wireless communication system, comprises the steps of: receiving allocation information for establishing a wireless resource for a specific HARQ process from at least one first HARQ process as a wireless resource for a second HARQ process; and transmitting/receiving the signal with an external terminal by using the wireless resource of the second HARQ process, wherein a soft buffer, which is linked to the second HARQ process, is a reestablished soft buffer that is linked to the at least one HARQ process, in accordance with the allocation information.