Reference Signal Receiving Method for DRX Power Optimization
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Solution Overview
Problem
Current technologies fail to efficiently manage power consumption in terminal devices by not synchronizing the sending of tracking reference signals (TRS) with discontinuous reception (DRX) modes, leading to unnecessary wake-ups and increased power usage.
Innovation Solution
Implementing a method where two types of TRSs are configured based on the DRX state, with a type #1 TRS transmitted during inactive times and a type #2 TRS during active times, allowing the terminal device to determine whether to use the TRS for time-frequency tracking and channel measurement only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If TRS is sent periodically regardless of DRX state, then time-frequency tracking accuracy is maintained, but terminal device power consumption increases due to unnecessary wake-ups
Solution Approach 1:
The patent applies dynamics by making the TRS sending mechanism adaptable rather than static. The network device dynamically adjusts TRS sending based on terminal device DRX states, switching between periodic sending (when terminal is active) and on-demand sending (when terminal is in sleep mode). This dynamic adjustment resolves the contradiction by allowing the system to maintain tracking accuracy when needed while conserving energy during sleep periods.
Solution Approach 2:
The patent changes the parameter of TRS sending timing based on terminal device state. When the terminal is in DRX sleep mode, the network device changes the sending parameter to skip TRS transmission or send only when necessary. When the terminal is active, the parameter returns to periodic sending. This parameter change resolves the contradiction by adapting the sending behavior to terminal power state.
2Reliability
If terminal device wakes up to receive periodic TRS during inactive periods, then TRS reception is ensured, but power consumption increases due to unnecessary wake-ups
Solution Approach 1:
The patent applies self-service by enabling the terminal device to autonomously determine whether to wake up for TRS reception based on receiving a wake-up indication from the network. Instead of blindly waking up for every periodic TRS, the terminal checks for wake-up indications first and only activates to receive TRS when the network explicitly indicates it should be sent. This self-service mechanism resolves the contradiction by eliminating unnecessary wake-ups while ensuring TRS reception when needed.
Solution Approach 2:
The patent applies preliminary action by having the network device send a wake-up indication before the actual TRS transmission. This preliminary signal allows the terminal to prepare for TRS reception only when necessary, rather than waking up in advance for every periodic TRS opportunity. The preliminary wake-up indication resolves the contradiction by providing advance notice of actual TRS sending, preventing unnecessary wake-ups.
3Use of energy by moving object
If TRS sending is synchronized with DRX active time, then power consumption is reduced, but time-frequency tracking may be affected when terminal is in sleep mode
Solution Approach 1:
The patent applies periodic action by maintaining periodic TRS sending during terminal active periods while using on-demand triggering during sleep periods. The periodic sending ensures tracking accuracy when the terminal is active and can process the signals. During sleep periods, the system switches to event-driven periodic action where TRS is sent only when wake-up indications are generated. This resolves the contradiction by using appropriate periodicity modes for different operational states.
Data Source
AI summary
This application provides a reference signal receiving method, a reference signal sending method, and an apparatus. The reference signal receiving method includes: when a terminal device is out of a first time period, detecting, by the terminal device, a first signal, and determining, based on a detection result of the first signal, whether to use a first reference signal to perform time-frequency tracking and/or channel measurement; and receiving, by the terminal device, a second reference signal when the terminal device is in the first time period, where the first reference signal and the second reference signal are reference signals used for time-frequency tracking and/or channel measurement.