Terminal Device QCL Signal Reception for 5G Power Saving
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Solution Overview
Problem
In 5G systems, the existing power saving mechanisms for terminal devices do not effectively improve the transmission performance of power saving signals, leading to increased power consumption due to unnecessary wake-ups during Discontinuous Reception (DRX) cycles.
Innovation Solution
Establishing a Quasi-Co-Located (QCL) relation between paging-related signals and power saving signals, allowing terminal devices to receive power saving signals based on the QCL relation, which includes parameters such as delay spread, Doppler spread, Doppler shift, and spatial receiving parameters, to optimize signal reception and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device receives power saving signals on all beams to ensure reliable signal detection, then the transmission performance of power saving signals is improved, but the power consumption of the terminal device increases
Solution Approach 1:
The terminal device performs beam detection and determines the optimal receiving beam for paging messages in advance. This preliminary action allows the device to reuse the same beam for receiving power saving signals, avoiding the need to scan all beams and reducing power consumption while ensuring reliable signal detection.
Solution Approach 2:
The terminal device reuses the receiving beam determined for paging message reception to also receive power saving signals. This multi-functional use of the same beam for different signal types eliminates redundant operations and reduces power consumption while maintaining detection reliability.
2Reliability
If the terminal device scans all beams to receive power saving signals, then the signal transmission performance is improved, but the time consumption and power consumption increase
Solution Approach 1:
The terminal device determines the optimal receiving beam for paging messages in advance and reuses it for power saving signal reception. This preliminary determination eliminates the need for time-consuming full beam scans, reducing detection time while ensuring reliable signal reception through the pre-identified optimal beam.
Data Source
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AI summary
The present application discloses a method and a device for signal transmission, comprising: a terminal device determining a QCL relationship between a paging related signal and an energy saving signal, wherein the paging related signal comprises a physical downlink control channel (PDCCH) for scheduling a paging message and/or a physical downlink shared channel (PDSCH) carrying the paging message; and the terminal device receiving the energy saving signal on the basis of the QCL relationship, or the terminal device receiving the paging related signal on the basis of the QCL relationship. By establishing a QCL relationship between a paging related signal and an energy saving signal, after determining a receiving beam of a paging message and a corresponding spatial receiving parameter, a terminal device can receive the energy saving signal on the basis of the receiving beam of the paging message and the spatial receiving parameter, avoiding reception of the energy saving signal on all beams transmitted by a network device, and achieving an energy saving effect.