SI Change Notification on Unlicensed Carrier via Paging Frame Alignment
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Solution Overview
Problem
In 5G wireless communication systems, when operating in unlicensed spectra, next generation node B (gNB) faces challenges in determining whether the channel is free for transmitting system information (SI) change indications or public warning system (PWS) notifications, leading to potential missed transmissions and communication disruptions between gNB and user equipment (UE).
Innovation Solution
The method involves determining and configuring the number of paging frames (PFs) in a discontinuous reception (DRX) cycle based on paging search space information, allowing for efficient alignment with radio frames and ensuring that SI change indications or PWS notifications are transmitted in multiple modification periods, including the use of a retransmission counter (RETX COUNT) to ensure reliable delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gNB transmits SI change indication in unlicensed spectrum, then system information update is achieved, but channel availability uncertainty causes transmission failures
Solution Approach 1:
The gNB performs Listen Before Talk (LBT) procedure before transmitting SI change indication to check if the channel is free. This preliminary action prevents transmission failures by ensuring channel availability before sending critical system information updates.
Solution Approach 2:
The patent implements acknowledgment mechanisms where UEs confirm receipt of SI change indications. This feedback loop allows the gNB to verify successful delivery and retransmit if necessary, improving reliability despite channel uncertainties in unlicensed spectrum.
2Object-affected harmful factors
If gNB uses LBT procedure to check channel availability, then transmission conflicts are reduced, but transmission delays increase
Solution Approach 1:
The gNB performs LBT procedure at predetermined intervals and at specific timing opportunities (e.g., at the beginning of transmission opportunities). This periodic approach balances channel access efficiency with timely SI change indication delivery, reducing both conflicts and excessive delays.
Solution Approach 2:
The patent implements dynamic timing adjustments where the gNB can adapt LBT timing based on channel conditions and traffic requirements. This allows optimization between conflict reduction and transmission delay minimization according to real-time network conditions.
3Reliability
If multiple paging frames are configured in DRX cycle, then SI change notification coverage is improved, but device complexity increases
Solution Approach 1:
The DRX cycle is divided into multiple paging frames, each potentially containing SI change indications. This segmentation ensures that if one paging frame is missed due to channel issues, other frames provide redundant notification opportunities, improving delivery reliability without requiring complex configuration management.
Data Source
AI summary
A communication method and system for converging a fifth generation (5G) communication system for supporting higher data rates beyond a fourth generation (4G) system with a technology for Internet of things (IoT) are provided. The communication method and system include intelligent services based on the 5G communication technology and the IoT-related technology, such as a smart home, a smart building, a smart city, a smart car, a connected car, health care, digital education, smart retail, security and safety services. A method performed by a base station for transmitting a paging message is provided. The method includes determining a number of paging frames (PFs) in a discontinuous reception (DRX) cycle based on information on paging search space, transmitting, to a terminal, information on the number of PFs in system information block 1 (SIB1), identifying at least one PF based on the number of PFs, and transmitting, to the terminal, at least one paging message in the at least one PF.