Terminal Device BSR Cancellation for D2D Mode 2
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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) for terminal devices, which affect communication efficiency in D2D communication scenarios.
Innovation Solution
A terminal device and integrated circuit configuration that includes a BSR generation unit for triggering and canceling buffer status reports, and a configuration unit for selecting between two modes of resource allocation, where the base station schedules resources in one mode and the terminal device selects resources in another, allowing for efficient handling of BSRs and SRs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the terminal device triggers BSR for D2D data in mode 2 (autonomous resource selection), then the base station can be informed of buffer status, but unnecessary BSR triggering occurs in mode 2 where the base station cannot schedule D2D resources anyway
Solution Approach 1:
The patent applies dynamics by making the BSR triggering mechanism adaptive to the configured mode. The terminal device dynamically adjusts its BSR triggering behavior based on whether mode 1 or mode 2 is configured, canceling the dynamic triggering in mode 2 while maintaining it in mode 1, thus optimizing processing efficiency for each operational context
Solution Approach 2:
The patent changes the parameter of BSR triggering conditions based on the configured mode. When mode 2 is configured, the terminal device modifies the triggering parameters by canceling BSR generation despite data availability, aligning the information transmission behavior with the actual resource allocation mechanism in use
2Loss of information
If the terminal device triggers scheduling request for D2D data, then resource allocation can be requested, but unnecessary scheduling request processing occurs in mode 2 where autonomous selection is used
Solution Approach 1:
The terminal device dynamically adjusts scheduling request triggering based on the configured mode. In mode 2 where autonomous resource selection is used, the scheduling request mechanism is dynamically canceled, eliminating unnecessary processing time while maintaining the capability in mode 1 where base station scheduling is required
3Productivity
If BSR triggering conditions are simplified, then processing is faster, but the base station cannot distinguish between D2D data and uplink data buffer status
Solution Approach 1:
The patent segments the buffer status reporting by creating separate logical channels - one for D2D data and one for uplink data. This segmentation allows the use of simplified triggering conditions while maintaining clear identification of data types through the logical channel association, resolving the contradiction between processing speed and information clarity
Data Source
AI summary
According to the present invention, there is provided a terminal device that transmits a signal to a base station apparatus through uplink, the terminal device including: a BSR generation unit that triggers a buffer status report BSR which is used for providing the base station apparatus with information on an amount of data that is available for transmission within a buffer for a first link which is used for communication between the terminal device and a different terminal device, and that cancels the triggered buffer status report; and a configuration unit that configures a first mode or a second mode, in which, in the first mode, a resource for transmitting data for the first link is scheduled by the base station apparatus, and in the second mode, the resource for transmitting the data for the first link is selected the terminal device from a resource pool, and in which, in a case where the second mode is configured, all of the triggered buffer status reports are cancelled.