Configured Grant Bundling for Reliable Wireless Transmissions
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Solution Overview
Problem
Dynamic scheduling in wireless communication networks leads to significant signaling overhead, especially for recurring traffic types like VoIP, and configured grants or assignments can fail to maintain reliability and latency improvements due to fluctuating traffic arrival times.
Innovation Solution
Implementing multiple sets of transmission occasions within a configured grant or assignment period, allowing for the same number of redundant transmissions regardless of traffic arrival time, through control signaling that configures offsets or predefined sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If configured grants or assignments are used to reduce signaling overhead, then signaling overhead is reduced, but transmission reliability and latency improvements are compromised due to fluctuating traffic arrival times
Solution Approach 1:
The configured grant period is segmented into multiple distinct sets of transmission occasions. Each set contains a sufficient number of transmission opportunities to ensure reliable delivery. By dividing the period into segments (sets), the system ensures that even if traffic arrives at different times, at least one complete set will be available, maintaining reliability while using configured grants to reduce signaling overhead.
Solution Approach 2:
Multiple sets of transmission occasions are pre-configured within the configured grant period before traffic arrives. This preliminary arrangement ensures that regardless of when traffic arrives during the period, there are already sufficient transmission opportunities prepared, guaranteeing both reliability and the low latency benefits of configured grants without requiring dynamic signaling.
2Reliability
If multiple redundant transmissions are performed within a bundle, then transmission reliability is improved, but the number of available transmission occasions decreases when traffic arrives late in the period
Solution Approach 1:
The transmission period is divided into multiple sets, where each set contains enough transmission occasions to accommodate the required number of redundant transmissions. This segmentation ensures that even if traffic arrives late in the period, a complete set with sufficient transmission opportunities is still available, maintaining both reliability and productivity.
Solution Approach 2:
The system configures multiple sets with different temporal characteristics (different numbers and positions of transmission occasions) within the same configured grant period. By changing the parameters of transmission occasion distribution across sets, the system ensures that at least one set will have sufficient occasions available regardless of traffic arrival time, maintaining both reliability and productivity.
Data Source
AI summary
A wireless device is configured to receive control signaling from a radio network node. The control signaling configures an uplink grant or downlink assignment to periodically recur. The control signaling also configures a number of redundant transmissions of a transport block that are transmittable within a bundle of the configured uplink grant or downlink assignment, where the number is greater than or equal to one. The control signaling may also configure different sets of transmission occasions within which the number of redundant transmissions are transmittable during, or starting during, a period of the configured uplink grant or downlink assignment.