SPS Resource Triggering for Timely Channel and Interference Measurements
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in interference and channel measurement due to high control signaling overhead in dynamic scheduling, and semi-persistent scheduling (SPS) resources are not effectively utilized for these measurements.
Innovation Solution
Utilize semi-persistent scheduling (SPS) resources to allocate periodic wireless resources for channel and interference measurements, triggered by downlink reference signals or control information, enabling more frequent measurements for better channel precoding, MCS selection, and interference estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic scheduling is used to allocate communication resources, then flexibility in resource assignment is improved, but control signaling overhead increases
Solution Approach 1:
The patent implements semi-persistent scheduling where resources are allocated periodically based on predetermined patterns rather than dynamic scheduling for each transmission. The base station configures SPS resources with specific periodicity, and both base station and UE follow the established pattern, eliminating the need for continuous control signaling while maintaining efficient resource utilization.
2Loss of information
If semi-persistent scheduling is used to reduce control signaling overhead, then control signaling overhead is reduced, but channel and interference measurement efficiency deteriorates
Solution Approach 1:
The patent configures dedicated channel measurement resources and interference measurement resources in advance as part of the SPS configuration. These measurement resources are pre-allocated at specific time instances within the SPS periodicity, allowing the UE to perform measurements without requiring additional dynamic scheduling commands, thus maintaining measurement efficiency while reducing control overhead.
3Loss of information
If SPS resources are allocated semi-statically, then control signaling overhead is reduced, but measurement frequency and timeliness deteriorate
Solution Approach 1:
The patent introduces dynamic triggering mechanisms within the semi-persistent scheduling framework. The base station can send trigger signals to activate or deactivate SPS resources and associated measurement resources at specific time instances. This allows the system to adapt measurement frequency dynamically based on channel conditions and traffic requirements while maintaining the overall SPS structure that reduces control overhead.
Data Source
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AI summary
A scheduling entity can configure semi-persistent scheduling (SPS) resources for downlink data and selectively receiving channel measurements and interference measurements from a user equipment. The scheduling entity can trigger the channel measurements and interference measurements using various methods including SPS configuration activation/reactivation/deactivation, DMRS based triggering, and DCI based triggering. The scheduling entity can benefit from more frequent and/or aperiodic interference and/or channel measurements in performing channel precoding, selecting a modulation and coding scheme (MCS), and estimating/predicting interference, noise, and channel quality at the UE. SPS configured channel and interference measurements also benefit the UE in data decoding that can result in a lower error ratio and higher data rate.