Directional Sidelink DRX Timer-Based Mode Switching
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing directional sidelink discontinuous reception (DRX) operations, leading to delayed responses due to unaligned TX-On and RX-On durations in directional DRX cycles.
Innovation Solution
Configuring user equipment (UEs) with timers to switch communication directions during active durations of directional DRX cycles, allowing UEs to switch from TX mode to RX mode or vice versa based on timer configurations, thereby extending the active duration for sidelink communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If UEs wait for TX-On duration to end before switching to RX mode in directional DRX cycles, then power consumption is reduced, but response latency increases
Solution Approach 1:
The patent implements dynamic mode switching within the active duration of directional DRX cycles. UEs can dynamically switch between TX and RX modes based on timer expirations and communication needs, rather than being statically confined to fixed TX-On or RX-On durations. This dynamic approach allows UEs to extend active duration when communication is needed while still enabling power savings during inactive periods, resolving the contradiction between power consumption and response latency.
2Loss of time
If UEs switch communication directions during active duration using timers, then response latency is reduced, but device complexity increases
Solution Approach 1:
The patent employs periodic timer-based mode switching within the active duration of directional DRX cycles. Timers are configured to periodically trigger switches between TX and RX modes, enabling UEs to respond promptly to communication opportunities while following a structured, predictable pattern. This periodic action reduces response latency compared to waiting for fixed duration endpoints, while the timer-based mechanism adds manageable complexity rather than requiring complex real-time decision-making logic.
3Device complexity
If directional DRX cycles use fixed TX-On and RX-On durations, then device complexity is reduced, but communication efficiency deteriorates
Solution Approach 1:
The patent changes the parameter of active duration from fixed to extendable based on communication needs. By introducing timer mechanisms that can extend the active duration beyond the originally configured TX-On or RX-On periods, the system adapts to actual communication requirements. This parameter change allows UEs to remain in active mode longer when sidelink communication opportunities arise, improving communication efficiency while maintaining relatively simple timer-based control logic.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A base station may configure one or more user equipments (UEs) with one or more timers, such that the UEs may switch directions for a communication mode for the duration of a timer and during a discontinuous cycle. The UEs may activate the timers and may perform the switching operation during the active duration of a discontinuous cycle. A UE may transmit a sidelink message during a transmission on duration (TX-On). The UE may activate a timer and switch to a receive mode. Similarly, the second UE may receive the sidelink message during a reception on duration (RX-On) and may activate the timer. The second UE may switch to a TX-On mode for an on duration of a TX-On cycle to transmit a sidelink response.