Collision Handling in Wireless Sidelink Transmissions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, device-to-device (D2D) communication can lead to resource collisions during sidelink transmissions, resulting in data loss as devices can only support the transmission of one transport block (TB) on a single resource due to limited capabilities, causing prioritization and potential discarding of data.
Innovation Solution
A method where user equipment (UE) receives scheduling information, determines potential collisions, stores one TB for retransmission if a collision occurs, and autonomously selects or schedules resources for retransmission, utilizing Hybrid Automatic Repeat Request (HARQ) buffers and counters to manage resource collisions and retransmissions effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If device-to-device communication is implemented to reduce base station load, then communication efficiency is improved, but resource collisions occur during sidelink transmissions
Solution Approach 1:
The transmitting device performs preliminary collision detection by comparing scheduled transmission resources with previously selected sidelink resources before actual transmission. This preliminary action allows the device to identify potential collisions and store the first transport block for retransmission when collisions are detected, preventing data loss and ensuring reliable communication.
2Device complexity
If only one transport block can be transmitted on a single resource due to device limitations, then device complexity is reduced, but data loss occurs during collisions
Solution Approach 1:
When a resource collision is detected, the transmitting device discards the immediate transmission of the first transport block on the collided resource but recovers it by storing the block in memory for retransmission. This approach maintains simple device architecture while preventing permanent data loss through the discard-and-recover mechanism.
3Loss of information
If collision detection and retransmission mechanisms are added, then data loss is minimized, but system complexity increases
Solution Approach 1:
The transmitting device autonomously performs collision detection by comparing its own scheduled resources with previously selected sidelink resources, eliminating the need for complex external coordination mechanisms. The device independently determines collisions and manages retransmissions using its own HARQ processes, reducing overall system complexity while preventing data loss.
4Extent of automation
If autonomous resource selection is used for retransmission, then base station intervention is reduced, but resource collision probability increases
Solution Approach 1:
The transmitting device uses feedback from the reception device (ACK/NACK signals) to determine whether retransmission is needed. This feedback mechanism guides autonomous resource selection, allowing the transmitting device to choose new sidelink resources for retransmission only when necessary, reducing collision probability while maintaining automation.
Data Source
AI summary
The present disclosure relates to methods and apparatuses for handling collisions. A method includes receiving at a first communication equipment first scheduling information; determining whether there is a transmission resource collision of a first TB and a second TB; and storing the first TB or the second TB for transmission if the collision is determined.