MAC-CE Application Time Alignment for Multi-UE Wireless Systems
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Solution Overview
Problem
Conventional methods for determining application times of MAC-CE-based actions in wireless communications systems result in misalignment across multiple user equipments (UEs), leading to sub-optimal beamforming, reduced communication reliability, and increased inter-network interference.
Innovation Solution
The proposed solution involves determining application times for MAC-CE-based actions using either absolute application times or dynamic offsets based on the number of HARQ messages transmitted, allowing for alignment of application times regardless of HARQ-based transmission timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-based transmission timing is used to determine application times of MAC-CE-based actions, then communication reliability is improved through acknowledgment mechanisms, but application time alignment across multiple UEs deteriorates
Solution Approach 1:
The patent applies preliminary action by having the network entity pre-calculate and indicate the application time in the MAC-CE before transmission. This allows the UE to perform the action at the predetermined time without waiting for HARQ acknowledgment, thereby maintaining reliability while achieving time alignment across multiple UEs.
Solution Approach 2:
The patent uses feedback mechanisms where the network entity receives HARQ feedback and adjusts subsequent MAC-CE transmissions accordingly. This feedback loop ensures reliable delivery while the application time is independently determined based on network scheduling, not HARQ timing.
2Manufacturing precision
If absolute application times are indicated in MAC-CE, then application time alignment across multiple UEs is improved, but MAC-CE structure complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the MAC-CE to include an explicit application time field. This parameter addition enables precise time alignment across multiple UEs while the rest of the MAC-CE structure remains unchanged, minimizing overall complexity increase.
3Manufacturing precision
If dynamic offsets based on HARQ message count are used, then application time alignment is improved, but processing complexity at UE increases
Solution Approach 1:
The patent applies self-service by having the UE autonomously determine the application time based on the indicated information in the MAC-CE without requiring complex external processing. The UE simply follows the predetermined time or calculates the offset based on received HARQ feedback, minimizing processing complexity while achieving alignment.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for techniques for determining when to perform medium access control (MAC) control element (CE) (MAC-CE) triggered actions across multiple user equipments (UEs). A method includes receiving a MAC-CE comprising an indication to perform one or more actions and an indication of an absolute application time; and based on receiving the MAC-CE, perform the one or more actions at the absolute application time.