Wireless Data Duplication for Latency Reduction
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Solution Overview
Problem
Current wireless communication networks face latency issues due to the need for acknowledgement messages in automatic repeat request (ARQ) processes, which introduce additional delay in data transmission, particularly in ultra-reliable and low-latency communications (URLLC) scenarios.
Innovation Solution
The method involves duplicating data units and transmitting them using different radio resources, allowing for simultaneous or near-simultaneous decoding and acknowledgement, thereby reducing latency by overlapping the decoding time of the first and second data units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acknowledgement messages are used in ARQ processes to ensure reliable data transmission, then reliability is improved, but latency increases due to additional waiting time for acknowledgements before re-transmission
Solution Approach 1:
The patent applies preliminary action by pre-transmitting duplicate data units before receiving acknowledgements for the first transmission. The sender transmits a first data unit and a second data unit (duplicate of the first) using different radio resources simultaneously or near-simultaneously, so that if the first is lost, the second is already available for immediate delivery, eliminating the need to wait for acknowledgement and re-transmission commands.
Solution Approach 2:
The patent implements copying by creating and transmitting a duplicate copy of the data unit through different radio resources. The second data unit is a copy of the first data unit, transmitted via alternative radio resources (e.g., different carriers, frequencies, or time slots), providing redundancy that reduces latency while maintaining reliability.
2Loss of time
If duplicate data units are transmitted using different radio resources, then latency is reduced through overlapping decoding, but device complexity increases due to multiple transmission paths
Solution Approach 1:
The patent applies segmentation by dividing the data transmission into separate segments (first data unit and second data unit) that are transmitted through different radio resources. Each segment can be independently decoded and processed, allowing parallel processing and reducing overall latency while managing system complexity through modular transmission paths.
Data Source
AI summary
There is provided a method in a user equipment for a wireless communications network, comprising: receiving a configuration message from a base station for the wireless communications network, the configuration message indicating that data to be transmitted between the user equipment and the wireless communications network is to be duplicated; and responsive to receipt of the configuration message, transmitting a first data unit and a second data unit to the wireless communications network, or receiving a first data unit and a second data unit from the wireless communications network; wherein the second data unit is a duplicate of the first data unit, and wherein the first data unit is transmitted or received using first radio resources, and the second data unit is transmitted using second radio resources that are different than the first radio resources.