Scheduling Request Prohibition in D2D ProSe Groups
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Solution Overview
Problem
In Device to Device (D2D) communication systems, there is a lack of methods for effectively managing scheduling requests, particularly in preventing unnecessary triggering of scheduling requests, which can lead to inefficiencies and increased resource utilization.
Innovation Solution
A method is introduced where User Equipment (UE) configures ProSe groups and receives scheduling request prohibit indications from the network, allowing it to control and manage sidelink Buffer Status Reports (BSR) and scheduling requests based on group identifiers, destination identifiers, and timers to prevent unnecessary scheduling requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If scheduling request is triggered for every sidelink data transmission, then data transmission reliability is improved, but signaling overhead and resource waste increase
Solution Approach 1:
The patent applies local quality by differentiating scheduling request handling based on logical channel groups. Different BSR types (short BSR, long BSR, truncated BSR) are triggered based on which logical channel group has data, allowing selective and efficient scheduling requests rather than uniform handling for all channels.
Solution Approach 2:
The patent changes parameters by introducing group-based logical channel identification and different BSR triggering conditions. The system monitors data availability per logical channel group and adjusts BSR triggering behavior based on the specific group containing data, optimizing the balance between reliability and signaling overhead.
2Productivity
If multiple scheduling requests are sent simultaneously for different logical channels, then resource allocation speed is improved, but system complexity and collision probability increase
Solution Approach 1:
The patent segments logical channels into different logical channel groups (LCG0, LCG1, LCG2, LCG3) and handles scheduling requests group-by-group through selective BSR triggering. This segmentation prevents simultaneous requests for all channels while maintaining efficient resource allocation for active groups.
Solution Approach 2:
The patent implements periodic action through scheduled BSR triggering based on logical channel group data availability. Instead of continuous or simultaneous requests, the system periodically checks and triggers BSRs only when specific groups have data, reducing complexity while maintaining productivity.
3Loss of energy
If scheduling request prohibition is applied to all ProSe groups, then resource utilization is improved, but communication flexibility deteriorates
Solution Approach 1:
The patent applies local quality by implementing SR prohibition at the group level rather than system-wide. The network can configure specific ProSe groups for SR prohibition while allowing other groups to trigger SRs normally, enabling fine-grained control that optimizes resource utilization without sacrificing communication flexibility.
Data Source
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for prohibiting from triggering scheduling request in a D2D communication system, the method comprising: configuring that the UE belongs to one or more ProSe groups; receiving, from a network, a Scheduling Request (SR) prohibit indication indicating at least one of the one or more ProSe groups; triggering a sidelink BSR for a first ProSe group of the one or more ProSe groups when a sidelink BSR trigger condition is met; and triggering a SR if the SR prohibit indication doesn't indicate the first ProSe group.