Uplink Multiplexing via Overlap Indications in Cellular Networks
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Solution Overview
Problem
Current configured-grant systems in cellular wireless communication networks face inefficiencies due to wasted transmission resources when UEs do not require allocated resources, leading to interference and unsuccessful transmissions during multiplexing of services.
Innovation Solution
A method for multiplexing uplink transmission resources in cellular wireless communication networks involves receiving an overlap indication from the base station, which indicates overlapping resources and changes to configured grant transmission parameters, allowing UEs to adjust their transmission strategies using explicit HARQ feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If configured-grant resources are allocated statically to UEs, then transmission latency is reduced and reliability is improved, but transmission resources are wasted when UEs do not require the resources
Solution Approach 1:
The system dynamically adjusts the use of configured-grant resources by introducing overlap indications that allow UEs to adapt their transmission behavior. When overlap indications are received, UEs can switch to explicit HARQ feedback or suspend transmissions, making the resource allocation dynamic rather than static, thus reducing waste while maintaining reliability when needed.
Solution Approach 2:
The system changes transmission parameters based on overlap indications. UEs can modify their HARQ feedback mode (implicit vs. explicit), transmission power, or resource usage based on received overlap indications, allowing efficient adaptation to actual traffic conditions and reducing resource waste while maintaining reliability.
2Productivity
If eMBB services are multiplexed over configured-grant resources, then resource utilization is improved, but interference occurs and transmission success rate deteriorates
Solution Approach 1:
The system introduces feedback mechanisms where UEs receive overlap indications from the base station and can respond by adjusting their transmission parameters or switching to explicit HARQ feedback. This feedback loop allows the system to maintain high resource utilization while protecting transmission success rates by adapting to interference conditions.
Solution Approach 2:
The system provides beforehand cushioning by sending overlap indications to UEs before potential interference occurs. This allows UEs to prepare appropriate responses (such as switching to explicit HARQ or adjusting power) in advance, cushioning against the negative effects of multiplexing while maintaining high resource utilization.
3Loss of time
If timer-based HARQ procedure is used for configured-grant services, then latency is reduced and efficiency is improved, but data loss occurs when collisions are not detected
Solution Approach 1:
The system introduces feedback through overlap indications that inform UEs about potential collisions before they occur. This allows the system to maintain low latency by using timer-based HARQ when no overlap is detected, while preventing data loss by switching to explicit HARQ or other protective measures when overlap indications are received.
Solution Approach 2:
The system provides beforehand cushioning by notifying UEs of potential collisions via overlap indications before the actual transmission occurs. This allows UEs to take preventive actions (such as suspending transmission or using explicit HARQ) to cushion against data loss while maintaining the low latency benefits of timer-based HARQ when conditions are good.
Data Source
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AI summary
Systems and methods to allow multiplexing of uplink transmissions over configured-grant resources. If a base station allocates configured-grant uplink transmission resources to a further UE the base station transmits an indication of the overlap to relevant UEs. The UEs may apply an explicit HARQ feedback process, or other techniques to manage transmissions such as transmitting a scheduling request with the data.