Joint Uplink and Sidelink BSR in Single MAC PDU
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Solution Overview
Problem
Existing solutions for buffer status reporting in device-to-device (D2D) communications require serial processing of uplink and sidelink data, leading to service delays due to inadequate resource allocation and inefficient use of available resources.
Innovation Solution
A method where a wireless device determines if granted uplink resources are sufficient for transmitting both buffer status reports (BSRs) and sidelink BSRs, allowing for joint allocation and communication of both reports in a single medium access control (MAC) protocol data unit (PDU, with options for truncation if resources are insufficient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If serial processing of uplink and sidelink BSR is used, then device complexity is reduced, but service delay increases and resource utilization deteriorates
Solution Approach 1:
The patent combines separate uplink BSR and sidelink BSR reporting processes into a unified joint BSR reporting mechanism. The wireless device determines total buffer status for both uplink and sidelink data and transmits a single joint BSR message, merging two sequential operations into one concurrent process, thereby reducing service delay while maintaining manageable complexity through standardized MAC layer procedures
2Ease of manufacture
If separate resource allocation for uplink and sidelink BSR is used, then resource allocation simplicity is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent implements a universal resource allocation framework where a single grant of uplink resources can accommodate both uplink data transmission and sidelink data transmission. The network node allocates resources that serve multiple purposes - the same uplink grant handles both BSR reports and subsequent data transmissions, making the resource allocation system multi-functional and improving overall utilization efficiency
3Productivity
If joint allocation of uplink and sidelink resources is implemented, then resource utilization efficiency is improved, but device complexity increases
Solution Approach 1:
The patent enables the wireless device to autonomously determine its own buffer status requirements for both uplink and sidelink data, calculate total resource needs, and self-manage the joint BSR reporting process without requiring complex network coordination. The device independently assesses whether granted resources are sufficient and handles truncation decisions, reducing the burden on network resources while improving overall system efficiency
Data Source
AI summary
A method in a wireless device is disclosed. The method comprises sending a scheduling request to a network node, and receiving, from the network node in response to the scheduling request, a grant of uplink resources. The method further comprises determining whether the granted uplink resources are at least equal to or larger than the resources required for transmission of both a buffer status report (BSR) and a sidelink BSR, and upon determining that the granted uplink resources are at least equal to or larger than the resources required for transmission of both the BSR and the sidelink BSR, communicating the BSR, and the sidelink BSR to the network node in a single medium access control (MAC) protocol data unit (PDU).