NES Cell Access via Anchor-Provided System Information
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Solution Overview
Problem
There is a need for a method and device to enable terminals to access SIB-less NES cells, which do not transmit system information blocks, for power-saving purposes in wireless communication systems.
Innovation Solution
A method and apparatus that allows terminals to receive system information from a camped-on cell in RRC inactive or idle mode, acquire necessary information for accessing an SIB-less NES cell based on signal strength thresholds, and perform a random access procedure when conditions are met, with the base station providing the required information and thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If system information blocks (SIB) are not transmitted in NES cells, then power consumption is reduced, but terminal access capability deteriorates
Solution Approach 1:
The patent introduces an anchor cell as an intermediary that provides system information for the NES cell to the terminal. The anchor cell receives system information from the network and shares it with terminals, enabling terminals to access NES cells without the NES cell transmitting SIB directly. This mediator approach resolves the contradiction by maintaining terminal access capability while preserving the power-saving benefit of not transmitting SIB in the NES cell.
Solution Approach 2:
The patent implements preliminary action by having the anchor cell provide system information to terminals before the terminal attempts to access the NES cell. The terminal acquires the necessary system information from the anchor cell in advance, allowing it to successfully access the SIB-less NES cell. This preliminary provision of information enables the terminal to compensate for the missing SIB transmission in the NES cell.
2Productivity
If SIB is not transmitted in NES cell, then network efficiency is improved, but information availability for terminal access deteriorates
Solution Approach 1:
The anchor cell serves as an intermediary that maintains system information availability for NES cells. Instead of the NES cell transmitting SIB directly (which would waste network resources), the anchor cell receives and shares the system information with terminals. This approach improves network efficiency by avoiding redundant SIB transmissions in NES cells while preserving information availability through the anchor cell's role as an information relay.
Solution Approach 2:
The anchor cell performs multiple functions: it provides system information for NES cell access, enables terminal camping and random access procedures, and maintains network efficiency. By making the anchor cell a multi-functional element that serves both information provision and access facilitation, the system achieves network efficiency without sacrificing information availability for terminal access.
3Reliability
If random access procedure is performed for SIB-less NES cell, then access capability is maintained, but procedure complexity increases
Solution Approach 1:
The patent applies preliminary action by having the terminal acquire system information from the anchor cell before initiating the random access procedure to the NES cell. The terminal obtains necessary parameters such as random access preamble configuration and cell identification information in advance. This preliminary information acquisition simplifies the subsequent random access procedure by reducing the information the terminal needs to gather during the access process itself.
Solution Approach 2:
The anchor cell acts as an intermediary that provides access-related system information to terminals, enabling them to perform random access to SIB-less NES cells. The anchor cell supplies critical parameters including random access preambles, cell identifiers, and access conditions, which simplifies the terminal's access procedure. Without this intermediary information provision, the terminal would need to perform complex information gathering during the access process.
Data Source
AI summary
The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. Disclosed are a method and a device for supporting access by a terminal to a NES cell, the method comprising the steps of: receiving, in a radio resource control (RRC) inactive mode or an RRC idle mode, system information from a camp-on first cell; acquiring, from the system information, system information about a second cell that does not perform system information transmission; determining, on the basis of threshold value information about the reception signal strength included in the system information about the second cell, whether a condition for access to the second cell is satisfied; and performing, if the condition is satisfied, a random access procedure for the access to the second cell.