D2D Buffer Status Report Segmentation for Resource Allocation
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Solution Overview
Problem
In wireless communication systems supporting device-to-device (D2D) communication, there is a need for efficiently transmitting buffer status reports to allocate resources for D2D data transmission, as existing methods do not effectively utilize limited wireless resources.
Innovation Solution
A method and apparatus are defined for a user equipment (UE) to report buffer status information to a base station using a buffer status report (BSR) mechanism, including procedures and timers for efficient resource allocation in D2D communication, allowing UE to autonomously select resources for D2D data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If buffer status reports are transmitted for D2D communication, then resource allocation efficiency is improved, but network load increases
Solution Approach 1:
The patent segments the buffer status report into two parts: D2D-specific buffer status information and traditional uplink buffer status information. This segmentation allows the network to process only the relevant D2D portion for D2D resource allocation, reducing unnecessary network processing load while maintaining efficient resource allocation for D2D communications.
Solution Approach 2:
The patent extracts D2D buffer status information from the general buffer status reporting mechanism and creates a dedicated D2D BSR structure. This extraction enables the network to handle D2D resource allocation separately from traditional uplink allocations, improving D2D resource allocation efficiency without proportionally increasing overall network load.
2Quantity of substance
If D2D communication is enabled, then network load is reduced, but resource allocation complexity increases
Solution Approach 1:
The patent implements self-service mechanisms where UEs autonomously monitor their own buffer status and trigger BSR transmissions when D2D data arrives. The network simply receives these triggered reports and allocates resources based on pre-defined rules, reducing the need for complex centralized resource management while maintaining efficient D2D communication.
Solution Approach 2:
The patent establishes a feedback loop where UEs report D2D buffer status to the network, and the network responds with resource allocations. This structured feedback mechanism simplifies resource allocation complexity by creating predictable, rule-based interactions rather than requiring complex real-time negotiations between UEs and the network.
3Productivity
If buffer status reporting procedures are defined, then D2D data transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent designs the D2D buffer status report to use the same MAC layer structure and transmission mechanisms as traditional uplink BSRs. This multi-functionality allows existing BSR processing infrastructure to handle D2D reports without requiring entirely new device complexity, while still improving D2D data transmission efficiency through dedicated reporting procedures.
Solution Approach 2:
The patent defines preliminary BSR triggering conditions and timer mechanisms that automatically initiate buffer status reporting when specific events occur (such as data arrival or timer expiration). This preliminary action eliminates the need for complex real-time decisions at transmission moments, reducing device complexity while maintaining efficient D2D data transmission through pre-planned reporting behavior.
Data Source
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AI summary
A method of supporting direct communication between wireless devices, a computer-readable medium storing instructions that, when executed by one or more processors, cause a first wireless user device to perform the method, a wireless user device performing the method, and a system comprising the wireless user device configured to perform the method and a base station are disclosed. The method comprises receiving, by a first wireless user device from a base station, configuration information associated with direct data transmission between the first wireless user device and one or more wireless user devices, wherein the configuration information comprises information of a resource selection mode for direct data transmission, and wherein the information of a resource selection mode indicates a resource pool from which the first wireless user device selects a resource for direct data transmission to one or more wireless user devices; mapping a first target identity to a first group identity and a second target identity to a second group identity, wherein the first target identity is associated with at least one target wireless user device of a first group of target wireless user devices among a plurality of target wireless user devices identified through a discovery procedure, and wherein the second target identity is associated with at least one target wireless user device of a second group of target wireless user devices among the plurality of target wireless user devices identified through the discovery procedure; transmitting, to the base station, a radio resource control, RRC, message comprising information of the first target identity and information of the second target identity; and transmitting, to the base station, a signal associated with a MAC-layer message. The MAC-layer message comprises a first field that indicates the first target identity and indicates the first group identity and a second field that indicates the second target identity and indicates the second group identity.