On-Demand SIB1 Access Using Wake-Up Signal Random Access
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Solution Overview
Problem
There is a need for methods and apparatus to reduce energy consumption in wireless communication systems, particularly in 5G and beyond systems, to support various services such as eMBB, mMTC, and URLLC, while efficiently managing system information block 1 (SIB1) transmission.
Innovation Solution
Implementing a BS that transmits SIB1 in an on-demand format in response to a wake-up signal (WUS) from a terminal, allowing for efficient request and provision of SIB1, and configuring WUS transmission through neighboring cells using higher layer signaling or pre-configured methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SIB1 is transmitted periodically to all terminals, then all terminals can reliably access system information, but energy consumption increases due to unnecessary transmissions
Solution Approach 1:
The system enables terminals to autonomously request SIB1 information only when needed, rather than relying on periodic broadcasts. The terminal monitors wake-up signals and sends random access requests to obtain SIB1 on-demand, allowing the system to serve itself efficiently without wasteful periodic transmissions to all terminals.
Solution Approach 2:
The SIB1 transmission mechanism transitions from a static periodic broadcast model to a dynamic on-demand model. The system adapts transmission timing based on actual terminal needs, using wake-up signals and random access procedures to trigger SIB1 transmissions only when terminals require system information, thereby optimizing energy efficiency while maintaining reliability.
2Use of energy by moving object
If SIB1 is transmitted on-demand based on terminal requests, then energy consumption is reduced, but access delay increases due to additional signaling steps
Solution Approach 1:
The system performs preliminary configuration of wake-up signal monitoring and random access resources during initial access. Terminals are pre-configured with parameters needed for on-demand SIB1 requests, so when system information is needed, terminals can immediately initiate the request procedure without additional configuration delays, reducing the time penalty of on-demand access.
Solution Approach 2:
The patent extracts the essential system information (SIB1) transmission from the periodic broadcast framework and implements it as a separate on-demand service. By separating SIB1 transmission from regular periodic broadcasts and handling it through dedicated random access procedures triggered by wake-up signals, the system reduces access delay while maintaining energy efficiency.
3Use of energy by moving object
If wake-up signal monitoring is enabled for on-demand SIB1, then energy efficiency improves, but device complexity increases due to additional monitoring procedures
Solution Approach 1:
The wake-up signal mechanism is designed to serve multiple functions: it indicates both the need for SIB1 transmission and provides timing synchronization for the random access procedure. By making the wake-up signal multi-functional, the system reduces the need for separate signaling mechanisms, thereby limiting the increase in device complexity while achieving energy efficiency goals.
Solution Approach 2:
The patent merges the wake-up signal function with the SIB1 request triggering mechanism. Instead of having separate wake-up indication and separate request triggering, the system combines these functions so that the same wake-up signal that indicates power-saving mode exit also triggers the SIB1 random access procedure, reducing processing complexity while maintaining energy efficiency.
Data Source
AI summary
The disclosure relates to a fifth generation (5G) or sixth generation (6G) communication system for supporting a higher data transmission rate and provides a random access method and apparatus for requesting and providing system information. A method performed by a terminal includes receiving, from a first BS, configuration information on a UL wake-up signal (WUS) for a second BS, transmitting, to the second BS, the UL WUS for requesting a system information block 1 (SIB1) associated with the second BS, receiving, from the second BS, a random access response based on the UL WUS, and receiving, from the second BS, the SIB1.