Half-Duplex UE Interrupted Time Domain Resources
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Solution Overview
Problem
Half-duplex user equipment in wireless communication systems face challenges in determining interrupted time-domain resources due to large timing advances, leading to degraded performance in non-terrestrial networks where timing misalignments between uplink and downlink radio frames cause issues with scheduling and resource allocation.
Innovation Solution
The method involves identifying a time-domain resource for uplink transmission and determining a time period for refraining from monitoring downlink communications based on offsets such as timing advance parameters, network-indicated offsets, and uplink-downlink timing interactions, allowing for accurate identification of interrupted time-domain resources and improved half-duplex operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If timing advance parameters are used to compensate for propagation delay in non-terrestrial networks, then uplink transmission timing is improved, but timing misalignment between uplink and downlink radio frames increases
Solution Approach 1:
The patent applies preliminary action by determining the time period for refraining from monitoring downlink communications before the actual uplink transmission occurs. The UE calculates the time period based on the time-domain resource for uplink transmission and timing advance parameters, and proactively avoids monitoring downlink resources during this calculated period. This preliminary determination prevents timing misalignment issues from affecting downlink reception.
2Device complexity
If half-duplex operation is implemented to reduce device complexity, then simultaneous transmission and reception is prevented, but scheduling flexibility and resource utilization deteriorate
Solution Approach 1:
The patent applies dynamics by making the downlink monitoring behavior adaptive based on the determined time period. The UE dynamically adjusts its monitoring pattern by refraining from monitoring downlink communications during the calculated time period while continuing to monitor outside this period. This dynamic adjustment allows the half-duplex UE to optimize its operation based on timing advance parameters and uplink scheduling, improving resource utilization without requiring full duplex capability.
3Reliability
If downlink monitoring is continuous to ensure reliable reception, then communication reliability is improved, but energy consumption and interference with uplink transmission increase
Solution Approach 1:
The patent applies periodic action by introducing a structured pattern of monitoring and non-monitoring periods for downlink communications. Instead of continuous monitoring, the UE periodically refrains from monitoring during the determined time period associated with uplink transmissions, and resumes monitoring outside this period. This periodic adjustment reduces energy consumption during uplink transmission phases while maintaining reliability during downlink reception phases.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may identify a time-domain resource for an uplink transmission. The UE may determine a time period, during which the UE is to refrain from monitoring for downlink communications, based at least in part on the time-domain resource for the uplink transmission and at least one of a first time offset associated with a difference in starting time between an uplink radio frame and a corresponding downlink radio frame at the UE, a second time offset associated with an uplink-downlink timing interaction for the UE, or a network-indicated offset. Numerous other aspects are provided.