Uplink Transmission Collision Management in Wireless Systems
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Solution Overview
Problem
In wireless communication systems, managing uplink transmission collisions on shared resources is challenging due to limited radio resources and the need to efficiently handle data and control information, particularly in scenarios where latency is critical.
Innovation Solution
A method where user equipment (UE) in a wireless communication system transmits data units using a configured uplink grant, receives a retransmission grant, determines retransmission timing based on a parameter related to retransmission delay, and retransmits data using the grant on the determined timing, ensuring efficient management of uplink transmission collisions on shared resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple user equipments share the same configured uplink grant for uplink transmission, then resource utilization efficiency is improved, but uplink transmission collision occurs between different user equipments
Solution Approach 1:
The base station pre-configures uplink grants and associated retransmission parameters to user equipments before actual transmission occurs. This preliminary configuration includes setting different retransmission delay parameters for different UEs, which enables the UEs to independently determine their retransmission timing without real-time coordination, thereby avoiding collisions while maintaining resource sharing
Solution Approach 2:
The patent introduces retransmission delay parameters as a variable parameter to differentiate retransmission timing among multiple UEs sharing the same uplink grant. By changing or adjusting these delay parameters, the system enables flexible control over retransmission timing, allowing UEs to select non-conflicting time resources for retransmission while maintaining efficient resource utilization
2Speed
If retransmission timing is determined without considering retransmission delay parameters, then transmission speed is improved, but latency increases due to collision resolution delays
Solution Approach 1:
The retransmission delay parameter is configured in advance as part of the uplink grant configuration. This preliminary setup allows the UE to directly determine retransmission timing without performing complex collision avoidance procedures or waiting for conflict resolution, thereby maintaining high transmission speed while minimizing latency through pre-planned timing
Data Source
AI summary
The present invention relates to a method for performing uplink transmissions by a user equipment in a wireless communication system. In particular, the method includes the steps of: transmitting a data unit to a network using a configured uplink grant; receiving an uplink grant for retransmission of the data unit from the network; determining a retransmission timing using a parameter related to a retransmission delay; and retransmitting the data unit to the network using the uplink grant for retransmission on the determined retransmission timing. Especially, the configured uplink grant is shared by the user equipment and another user equipment, and the parameter indicates at least one instance of retransmission delay.