DRX Beam Selection Timing Alignment in 5G Terminals
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Solution Overview
Problem
In the context of 5G multi-beam scenarios, existing DRX technologies cause delays in the terminal device's selection of downlink receiving beams due to the mismatch between the downlink reference signal periods and the DRX cycles, leading to inefficiencies in signal transmission.
Innovation Solution
The proposed method involves determining start time points for the terminal device's activated state within the DRX cycle, ensuring alignment with the network device's signal transmission periods, allowing the terminal device to receive a first signal at each start time point for selecting the target downlink receiving beam, thereby reducing the time required for beam selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the terminal device uses existing DRX technology with separate reference signal periods and DRX cycles, then the terminal device can save energy by periodically entering sleep state, but the time required for the terminal device to select downlink receiving beam increases
Solution Approach 1:
The network device sends the first signal (downlink reference signal) exactly at the start time point when the terminal device enters the activated state of DRX. This preliminary alignment ensures that the terminal device can immediately perform beam selection without waiting for the next reference signal period, thereby reducing beam selection time while maintaining the energy-saving DRX operation
Solution Approach 2:
The patent introduces a parameter relationship where the start time point of the DRX activated state is aligned with the transmission timing of the downlink reference signal. By coordinating the DRX cycle parameters with the reference signal period parameters, the system optimizes both energy efficiency and beam selection speed
2Ease of operation
If the terminal device enters activated state between transmission timing of two adjacent reference signals, then the terminal device can maintain RRC connection and quickly transition to activated state, but the time for selecting downlink receiving beam becomes longer
Solution Approach 1:
The network device is configured to send the downlink reference signal at the exact moment the terminal device enters the activated state. This preliminary action ensures that the reference signal is already available when the terminal device wakes up, eliminating the delay that would otherwise occur while waiting for the next reference signal transmission
Solution Approach 2:
The system uses feedback mechanisms where the network device determines the DRX start time points based on the terminal device's DRX configuration, and accordingly adjusts the reference signal transmission timing to match, ensuring optimal synchronization
Data Source
AI summary
A signal transmission method includes: determining, by a terminal device, at least one start time point for entering an activated state of radio resource control (RRC) active discontinuous reception (DRX); and receiving, by the terminal device at each of the at least one start time point, a first signal sent by a network device, the first signal being used by the terminal device to determine, from at least one downlink receiving beam, a target downlink receiving beam for receiving and decoding a downlink control channel sent by the network device.