PC5 DRX Coordination for Energy-Efficient V2X Reception
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Solution Overview
Problem
In 5G network PC5 communication, the receiving terminal device consumes excessive power as it continuously listens for data from the transmitting terminal device without considering its status, leading to inefficient power usage.
Innovation Solution
A first terminal device determines a discontinuous reception (DRX) parameter based on the transmission requirements of a V2X service and sends it to a second terminal device for PC5 communication, allowing both devices to synchronize their DRX parameters to reduce unnecessary listening and conserve energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmitting terminal device continuously sends data on PC5 interface, then data transmission reliability is improved, but the receiving terminal device's power consumption increases excessively
Solution Approach 1:
The patent introduces discontinuous reception (DRX) parameters that enable the receiving terminal device to periodically wake up to check for data and then return to sleep mode. This periodic action replaces continuous listening, significantly reducing power consumption while maintaining the ability to receive data transmissions reliably. The DRX cycle allows the device to balance between energy saving and data reception readiness.
Solution Approach 2:
The transmitting terminal device determines and sends DRX parameters to the receiving terminal device before actual data transmission begins. This preliminary configuration allows the receiving device to pre-establish its wake-up schedule and sleep patterns, optimizing power consumption from the outset while ensuring it is ready to receive data when transmitted.
2Reliability
If the receiving terminal device continuously listens for data, then data reception readiness is improved, but energy efficiency deteriorates
Solution Approach 1:
The receiving terminal device uses DRX parameters to enter periodic sleep cycles, waking up only at predetermined intervals to check for incoming data. This periodic monitoring maintains data reception readiness while dramatically reducing energy consumption compared to continuous listening. The device can quickly transition between sleep and active states based on the DRX schedule.
Solution Approach 2:
The patent changes the operational parameters of the receiving terminal device by introducing DRX configuration parameters that control wake-up intervals and sleep durations. These parameter changes enable the device to dynamically adjust its listening behavior, optimizing the balance between reception readiness and energy efficiency based on transmission requirements.
3Use of energy by moving object
If DRX parameters are negotiated between terminal devices, then energy consumption is reduced, but communication protocol complexity increases
Solution Approach 1:
The DRX parameters are negotiated and configured in advance before actual data transmission begins. This preliminary action allows both terminal devices to establish their power-saving schedules upfront, avoiding the need for complex real-time negotiations during data transmission. The protocol complexity is concentrated in the initial setup phase rather than ongoing communication.
Solution Approach 2:
The patent incorporates feedback mechanisms where terminal devices exchange DRX parameter information and confirmations during the negotiation process. This feedback ensures both devices agree on the power-saving schedule, preventing communication errors while maintaining relatively simple protocol structures. The feedback loop validates the DRX configuration without adding significant complexity.
Data Source
AI summary
This application relates to the field of communication technologies and discloses communication methods and apparatuses. One method includes: determining, by a first terminal device, a first discontinuous reception (DRX) parameter based on a transmission requirement of a first vehicle-to-everything (V2X) service, wherein the transmission requirement comprises a service requirement, and sending, by the first terminal device to a second terminal device, the first DRX parameter for proximity communication 5 (PC5) communication of the first V2X service between the first terminal device and the second terminal device.