Sidelink Unicast DRX with Connection-Specific Power Scheduling
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in managing discontinuous reception (DRX) for sidelink unicast communications, particularly in scenarios where UEs have multiple connections and asymmetric power states, leading to suboptimal power consumption and network performance.
Innovation Solution
Implementing connection-specific DRX configurations for sidelink communications, where each unicast connection has independent DRX parameters, allowing for flexible and asymmetric power management between UEs, with configurations negotiated via PC5-RRC signaling or pre-configured rules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a common DRX configuration is used for all sidelink connections, then device complexity is reduced and ease of operation is improved, but power efficiency deteriorates because asymmetric power states of different UEs cannot be accommodated
Solution Approach 1:
The patent segments the common DRX configuration into connection-specific DRX configurations. Each unicast connection between UEs is assigned its own DRX parameters (drx-UL-ConfigIndex, drx-PL-ConfigIndex, drx-HARQ-RTT-Timer, etc.), allowing independent optimization of power consumption for each link based on the specific power states and requirements of the connected UEs.
Solution Approach 2:
The patent applies local quality by allowing different DRX configurations for different connections. Each UE can have asymmetric DRX settings with its respective peer UE, where one UE may use shorter DRX cycles while the other uses longer cycles, matching their individual power capabilities and traffic patterns rather than forcing a uniform configuration.
2Use of energy by moving object
If connection-specific DRX configurations are implemented for each unicast link, then power efficiency is improved by accommodating asymmetric power states, but device complexity increases due to multiple independent DRX parameter sets
Solution Approach 1:
The patent uses universality by defining a standardized set of DRX configuration parameters that can be applied across multiple connections. The same parameter names and structures (drx-UL-ConfigIndex, drx-PL-ConfigIndex, drx-HARQ-RTT-Timer, drx-HARQ-RTT-TimerUL, etc.) are reused for each connection, allowing the system to manage multiple connection-specific configurations with a unified framework rather than requiring entirely separate mechanisms for each link.
3Adaptability or versatility
If DRX configurations are negotiated via PC5-RRC signaling between UEs, then adaptability is improved for specific connection needs, but loss of time increases due to the negotiation overhead
Solution Approach 1:
The patent applies preliminary action by allowing UEs to pre-negotiate and establish DRX configurations during the connection setup phase via PC5-RRC signaling. Once configured, these DRX parameters remain in effect for the duration of the connection, avoiding the need for repeated negotiations and reducing time loss during data transmission. The initial negotiation captures the adaptability needs while the pre-established configuration eliminates ongoing overhead.
Data Source
AI summary
This disclosure provides details of a configuration signaling and associated behaviors for sidelink (SL) discontinuous reception (DRX) for unicast, connection-specific DRX. According to one embodiment, a first user equipment (L E) configures link-specific discontinuous reception (DRX) by processing a common DRX configuration that is preconfigured, received through a Uu interface, or received in a SIB; and signaling over a PCS interface with a second UE, a link-specific configuration for a link-specific DRX cycle, the Link-specific configuration including a link-specific on-duration parameter.