Paging in Unlicensed Bands via Multiple POs
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Solution Overview
Problem
Current paging methods in unlicensed bands for next-generation wireless access networks face challenges in reducing paging non-transmission probability due to Listen Before Talk (LBT) failures, which limit the reliability and efficiency of radio communication.
Innovation Solution
The proposed solution involves configuring an additional paging window and adjusting the PDCCH monitoring time in the unlicensed band, allowing for multiple paging occasions within a paging frame and flexible start positions, thereby increasing the chances of successful channel access and reducing LBT failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If Listen Before Talk (LBT) procedure is used for channel access in unlicensed band, then collision with other systems is avoided, but paging transmission reliability deteriorates due to LBT failures
Solution Approach 1:
The paging frame is divided into multiple paging occasions (at least two), and each paging occasion is assigned to different UEs. This segmentation allows the base station to attempt paging transmission in multiple time opportunities, so if LBT fails in one occasion, paging can still be transmitted in another occasion within the same frame, thereby improving reliability without requiring changes to the LBT procedure itself.
2Reliability
If multiple paging occasions are configured in a paging frame, then paging transmission reliability is improved, but device complexity increases
Solution Approach 1:
The base station dynamically selects which paging occasion to use for transmission based on LBT outcomes. The system configures multiple paging occasions with different time positions, and the actual transmission occasion is determined dynamically according to channel access success, making the paging mechanism adaptable to unlicensed band conditions while keeping UE procedures relatively simple.
Solution Approach 2:
The paging configuration includes parameters such as numberOfPOsPerPF (number of paging occasions per frame) and poOffset (offset for paging occasion timing). By adjusting these parameters, the system can flexibly control the number and positioning of paging occasions to balance reliability requirements against device complexity and processing overhead.
Data Source
AI summary
Provided are a paging method and device in an unlicensed band. The method may include receiving configuration information about at least two paging occasions (POs) for paging in an unlicensed band; and sequentially monitoring a downlink control channel (PDCCH) in the paging occasions until a paging message is received on the basis of the configuration information.