Sidelink Wireless Device Resource Preemption Handling
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Solution Overview
Problem
In sidelink communication, grant-free transmission in sidelink communication faces challenges with packet collisions due to the absence of a predetermined procedure for collision prevention, particularly in scenarios without centralized base station control.
Innovation Solution
A wireless communication device is equipped with a control unit that adjusts transmission parameters and transmits packets when a selected resource is preempted by another device in sidelink communication, thereby reducing packet collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If grant-free transmission is used in sidelink communication, then transmission latency is reduced and communication speed is improved, but packet collision risk increases due to absence of collision prevention procedures
Solution Approach 1:
The transmitting terminal performs sensing operations before transmitting the packet to detect whether the selected resource is being used by another terminal. This preliminary detection action allows the terminal to adjust transmission parameters in advance to avoid collisions, thereby maintaining low latency while improving reliability.
Solution Approach 2:
When a resource is detected as being in use, the transmitting terminal adjusts transmission parameters such as transmission power, time offset, or frequency offset. These parameter changes enable the terminal to transmit packets on preempted resources without causing collisions, resolving the contradiction between fast transmission and collision avoidance.
2Reliability
If centralized base station control is implemented for collision prevention, then packet collision avoidance is improved, but system complexity and control overhead increase
Solution Approach 1:
The transmitting terminal autonomously performs sensing operations and adjusts its own transmission parameters based on detected resource usage. This self-service mechanism eliminates the need for centralized base station control while maintaining collision avoidance capability, thereby reducing system complexity and control overhead.
Solution Approach 2:
The terminal uses sensing operations to gather feedback information about resource usage in the sidelink channel. This feedback enables the terminal to make autonomous decisions about transmission parameter adjustment, achieving reliable collision avoidance without complex centralized control.
3Reliability
If transmission parameters are adjusted when resource is preempted, then packet collision is reduced, but transmission time and processing delay increase
Solution Approach 1:
The terminal performs sensing operations selectively based on the urgency of the packet and the detected resource usage. For urgent packets or when resources are clearly available, full sensing and parameter adjustment may be skipped, reducing processing delay while maintaining collision avoidance for non-urgent traffic.
Solution Approach 2:
When the sensing operation detects that the selected resource is not in use, the terminal skips the parameter adjustment step and transmits the packet immediately. This rushing through of unnecessary processing steps minimizes transmission delay while still ensuring collision avoidance when needed.
Data Source
AI summary
There is provided a wireless communication device which includes a control unit. In a case where a resource selected for use in packet transmission is preempted by another wireless communication device in sidelink communication, the control unit adjusts a transmission parameter and transmits the packet. Further, the adjustment of the transmission parameter includes conversion of a modulation method to a high-efficiency method.