Uplink Resource Switching After Cancellation Indication
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Solution Overview
Problem
Preemption or cancellation of downlink and uplink transmissions in wireless communication systems can reduce reliability and coverage for non-URLLC service UEs, such as eMBB service UEs, and subsequent signaling to provide new resources results in excessive overhead.
Innovation Solution
UEs are configured with scheduled alternate resources and dynamically select these resources based on information in a cancellation indication to maintain reliability and coverage without additional signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If preemption or cancellation of downlink and uplink transmissions is performed to support URLLC services, then URLLC service quality is improved, but reliability and coverage for non-URLLC service UEs deteriorate
Solution Approach 1:
The system pre-configures alternate uplink resources for non-URLLC UEs before cancellation indications are received. When a cancellation indication occurs, the UE can immediately switch to the pre-configured alternate resources without waiting for additional signaling, thereby maintaining reliability while allowing URLLC preemption
Solution Approach 2:
The cancellation indication message serves as an intermediary that carries implicit information about which resources are affected. The UE uses this intermediate signal to trigger switching to alternate resources, resolving the conflict between URLLC quality and non-URLLC reliability without requiring direct re-scheduling signaling
2Reliability
If subsequent signaling is used to provide new resources after cancellation indication, then resource allocation for non-URLLC UEs is maintained, but signaling overhead increases excessively
Solution Approach 1:
The non-URLLC UE autonomously identifies and switches to alternate uplink resources based on the cancellation indication received, without requiring the network to send additional re-scheduling signaling. The UE uses the implicit information in the cancellation indication (such as the time resource index) to self-determine the alternate resources, thereby eliminating excessive signaling overhead while maintaining resource allocation
Solution Approach 2:
Alternate resources and the rules for identifying them are pre-configured in the UE before cancellation occurs. This preliminary configuration enables the UE to immediately switch resources upon receiving the cancellation indication without waiting for subsequent signaling, thus reducing signaling overhead while maintaining reliability
Data Source
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AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive a cancellation indication, to drop one or more scheduled uplink communications associated with a first one or more scheduled uplink resources, in a group-common downlink control information message of a downlink control channel communication; identify, based at least in part on the cancellation indication, a second one or more scheduled uplink resources for a particular uplink communication; and transmit the particular uplink communication using the second one or more scheduled uplink resources. Numerous other aspects are provided.