Terminal Device Logical Channel Prioritization for Uplink BSR
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Solution Overview
Problem
Existing wireless communication systems, particularly in LTE networks, face inefficiencies in processing Buffer Status Reports (BSR) and Scheduling Requests (SR) due to inadequate prioritization of MAC control elements, which affects communication efficiency between terminal devices.
Innovation Solution
Implementing a logical channel prioritization procedure in terminal devices that assigns higher priority levels to specific MAC control elements for uplink communication, including those related to data availability and power headroom reports, to optimize resource allocation and communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a terminal device transmits both uplink BSR and D2D BSR with equal priority, then both buffers can be reported, but uplink communication efficiency deteriorates due to insufficient prioritization of critical information
Solution Approach 1:
The patent applies local quality by assigning different priority levels to different types of BSR information. Specifically, uplink BSR is assigned a higher priority level than D2D BSR, ensuring that critical uplink buffer status information is transmitted first. This differentiated priority assignment resolves the contradiction by ensuring both information types are reported while prioritizing the more critical uplink communication data.
2Productivity
If the terminal device prioritizes uplink BSR over D2D BSR, then uplink communication efficiency is improved, but D2D buffer status reporting may be delayed
Solution Approach 1:
The patent implements preliminary action by establishing a predefined priority hierarchy before transmission occurs. The terminal device is configured to always prioritize uplink BSR over D2D BSR in the logical channel prioritization procedure. This preliminary assignment of priorities ensures that uplink communication efficiency is maintained while D2D reporting is handled in subsequent transmission opportunities, resolving the time delay issue through structured resource allocation.
3Loss of information
If multiple MAC control elements are included in uplink transmission, then comprehensive buffer status is reported, but processing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing buffer status reporting into separate MAC control elements for different buffer types (uplink BSR and D2D BSR). Each MAC CE is processed independently with assigned priority levels. This segmentation allows the terminal device to manage multiple buffer status reports systematically, reducing processing complexity while maintaining comprehensive information reporting through the structured prioritization framework.
Data Source
AI summary
A terminal device transmits a signal to a base station apparatus through uplink. The terminal device considers a priority level for multiple MAC control elements in the logical channel prioritization procedure for the uplink, in a case where initial transmission is performed. At least first and second MAC control elements are included in the multiple MAC control elements. The first MAC control element provides the base station apparatus with information on an amount of first data available for transmission within a first buffer for the uplink. The second MAC control element provides the base station apparatus with information on amount of second data available for transmission within a second buffer for a first link that is used for communication between the terminal device and a different terminal device. The first MAC control element has a higher priority level than the second MAC control element except when being included for padding.