Grant-Free Uplink Validation via Prohibit Timer
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR and LTE, face inefficiencies in grant-free uplink resource management, leading to processing resource overload and unsuccessful blind decodes due to the continuous monitoring of configured grant resources by base stations, even when there is no uplink traffic.
Innovation Solution
Implementing a validation scheme that determines valid times for grant-free uplink transmissions by enabling a prohibit timer and associating configured grant resources with downlink or uplink transmissions to temporarily disable them, allowing base stations to allocate resources more efficiently and distribute them across UEs without overloading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If base stations continuously monitor configured grant resources for grant-free uplink transmissions, then uplink communication availability is improved, but processing resource overload occurs
Solution Approach 1:
The base station performs preliminary validation by checking whether the current time falls within a valid transmission time window before attempting to monitor configured grant resources. This preliminary check prevents unnecessary processing operations when transmissions are not expected, thereby reducing processing resource wastage while maintaining uplink communication availability when conditions are appropriate.
2Reliability
If base stations monitor all configured grant resources, then transmission detection capability is improved, but unsuccessful blind decodes increase
Solution Approach 1:
The base station applies local quality by validating whether the current time is within a valid transmission time window determined based on associated downlink or uplink transmissions. This selective validation ensures that monitoring efforts are concentrated only on time periods when transmissions are expected, improving transmission detection capability while avoiding unsuccessful blind decodes during invalid periods when no transmissions are anticipated.
3Adaptability or versatility
If configured grant resources are distributed across multiple UEs, then resource utilization is improved, but processing load on base station increases
Solution Approach 1:
The base station performs preliminary validation for each UE's configured grant resources by checking whether the current time falls within valid transmission time windows determined by associated downlink or uplink transmissions. This preliminary action reduces the base station's processing load by avoiding monitoring of resources during invalid periods, while still maintaining high resource utilization across multiple UEs by enabling monitoring during valid windows for each UE.
Data Source
AI summary
Certain aspects of the present disclosure relate to communicating via grant-free uplink resources. An example method generally includes receiving, from a base station, a configuration indicating one or more sets of resources for grant-free uplink transmissions; determining a valid time to transmit a grant-free uplink transmission via the one or more sets of resources based on a transmission associated with the one or more sets of resources; and transmitting, to the base station, the grant-free uplink transmission based on the determination.