Sidelink DRX Host Assignment for Power-Aware UE Coordination
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Solution Overview
Problem
The coordination of sidelink DRX configurations in wireless communications between user equipment (UEs) is debated, with existing assumptions favoring a TX-centric approach that may not be suitable for all scenarios, leading to inefficient power consumption and potential misalignment in DRX cycles due to multiple PC5 links and varying RRC states among UEs.
Innovation Solution
A flexible assignment mechanism for TX-centric or RX-centric DRX configuration is introduced, allowing UEs to determine sidelink DRX configuration based on priority settings and assistance information exchange, enabling intelligent decision-making between initiating and peer UEs to optimize power consumption and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a TX-centric DRX configuration approach is used in sidelink communications, then the transmitting UE can control the DRX cycle, but the receiving UE may experience misalignment in DRX cycles due to multiple PC5 links and varying RRC states, leading to inefficient power consumption
Solution Approach 1:
The patent implements dynamic DRX configuration where the receiving UE can switch between TX-centric and RX-centric modes based on its RRC state and link conditions. The receiving UE determines whether to follow the transmitting UE's DRX configuration or use its own configuration, allowing adaptive optimization of power consumption while maintaining reliable communication across multiple PC5 links
Solution Approach 2:
The patent changes the DRX configuration parameters dynamically based on the receiving UE's RRC state (RRC_IDLE, RRC_INACTIVE, or RRC_CONNECTED) and the number of active PC5 links. When the receiving UE is in RRC_IDLE or has multiple active links, it switches to RX-centric mode with its own DRX configuration, otherwise it follows TX-centric mode, thereby optimizing power consumption for different operational scenarios
2Device complexity
If a fixed TX-centric DRX configuration is assumed, then the configuration process is simplified, but it may not be suitable for all scenarios involving multiple PC5 links and different RRC states, reducing adaptability
Solution Approach 1:
The patent makes the DRX configuration approach dynamic rather than fixed. The receiving UE evaluates its current RRC state and the number of active PC5 links to determine whether to use TX-centric or RX-centric configuration. This dynamic adaptation ensures the system remains simple to operate while being versatile enough to handle various scenarios including single-link and multi-link communications across different RRC states
Solution Approach 2:
The patent segments the DRX configuration approach into two distinct modes (TX-centric and RX-centric) that can be selected based on specific conditions. By dividing the configuration space into these two segments with clear selection criteria (RRC state and link count), the system maintains simplicity while achieving adaptability across different communication scenarios
Data Source
AI summary
A first user equipment able to communicate with other user equipments via sidelink communications determines a procedure to use for selecting a host of a coordination of sidelink discontinuous reception when receiving a connection request from a second user equipment, and based on whether a requirement for a flow corresponding to the connection request meets a threshold. The first user equipment then performs sidelink discontinuous reception coordination between the first and second user equipment based on the determined host. The first user equipment sends configuration a second user equipment to use for discontinuous reception for the sidelink communications, or it requests help from a second user equipment to perform alignment of discontinuous reception for the sidelink communications.