Paging Early Indication Layout for Low-Power Terminal Wake-Up
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Solution Overview
Problem
In existing communication networks, terminals waste significant power due to unnecessary wake-ups on paging occasions (POs) since the probability of receiving paging messages is low, leading to inefficient power consumption.
Innovation Solution
Implementing a secondary synchronization signal (SSS)-based paging early indication (PEI) that notifies terminals of pending paging messages before POs, using a pseudo-random sequence with a length greater than 127, and positioning the PEI differently in the frequency domain to minimize interference with intra-frequency cell search and measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal monitors paging messages on each paging occasion, then the terminal can receive paging notifications, but the power consumption increases significantly due to unnecessary monitoring when paging probability is low
Solution Approach 1:
The patent introduces a PEI (Paging Early Indication) signal that is transmitted before the actual paging message on the PDCCH. The PEI provides advance notification to the terminal about whether a paging message will be sent in the upcoming PO. By checking the PEI first, the terminal can determine in advance whether it needs to wake up fully to monitor the PDCCH for paging messages, thus avoiding unnecessary power consumption while ensuring reliable paging reception when needed
2Ease of operation
If the PEI is positioned at the same frequency location as the SSS, then the terminal can easily synchronize, but the intra-frequency cell search and measurement accuracy deteriorates
Solution Approach 1:
The patent positions the PEI at a different frequency location offset from the SSS by a predetermined value. This frequency domain separation allows the PEI to be distinguished from the SSS in the frequency dimension, preventing interference between the two signals. The terminal can still efficiently synchronize using the SSS while separately detecting the PEI at the offset frequency position, thus maintaining both synchronization ease and measurement accuracy
Data Source
AI summary
A paging indication method includes: generating a PEI, where the PEI indicates whether there is a paging message sent to a terminal on one or more POs; determining a time frequency region for sending the PEI, where the time frequency region corresponds to a synchronization signal block (SSB), a first interval is different from a second interval, the first interval is an interval between a start subcarrier of the PEI and a start subcarrier of the SSB, and the second interval is an interval between a start subcarrier of a secondary synchronization signal (SSS) and the start subcarrier of the SSB; and sending, in the time frequency region, the PEI to the terminal.