Paging Window with Multiple Candidate Occasions for Unlicensed Band Delay Reduction
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Solution Overview
Problem
In wireless communication systems, particularly in unlicensed frequency bands, the transmission of paging messages in the New Radio (NR) system experiences significant delay due to the limited opportunity for channel preemption, leading to postponed message delivery.
Innovation Solution
The method involves determining a paging window with multiple candidate paging occasions (POs) in a network device, allowing it to monitor and send paging messages during idle periods within this window, thereby reducing delay by providing multiple opportunities for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If paging messages are sent in a single Paging Occasion (PO) in the NR system on unlicensed frequency bands, then the system follows the standard paging procedure, but the delay in sending paging messages increases significantly because there is only one opportunity for transmission
Solution Approach 1:
The patent segments the single paging occasion into multiple candidate paging occasions (S-POs) within a paging window. Instead of having one fixed PO, the system now has S different POs that the terminal can monitor, where S > 1. This segmentation provides multiple transmission opportunities, reducing the delay caused by channel contention while maintaining reliable paging delivery.
Solution Approach 2:
The patent establishes a paging window structure in advance that contains multiple candidate POs. The terminal is pre-configured to monitor these multiple POs within the window, so when the network device gains channel access, it can immediately transmit the paging message at the next available PO without waiting for a single predetermined opportunity.
2Object-affected harmful factors
If the network device uses Listen Before Talk (LBT) to determine channel availability before sending paging messages, then the system follows unlicensed band regulations, but the single PO structure means that if the channel is busy, the paging message must be postponed until the next paging cycle
Solution Approach 1:
The patent introduces dynamic flexibility by allowing the paging message to be transmitted at any of the S candidate POs within the paging window, rather than at a fixed single PO. When the LBT procedure succeeds at different times, the paging message can be dynamically scheduled at the next available PO within the window, adapting to the actual channel conditions and reducing postponement delay.
Solution Approach 2:
The patent changes the time parameter structure from a single fixed PO to multiple POs distributed within a paging window. This parameter change transforms the paging opportunity structure, allowing the system to exploit temporal diversity and select the earliest available PO for transmission, thereby reducing the impact of channel contention delays.
3Loss of time
If multiple candidate paging occasions are introduced in a paging window, then the delay in sending paging messages is reduced, but the complexity of paging window management and monitoring increases
Solution Approach 1:
The patent designs the paging window structure with universal applicability, where the same window configuration and multiple PO structure can be used for different terminals and paging scenarios. The network device and terminal device both follow the same rules for window establishment and PO monitoring, simplifying the overall system management despite having multiple POs. The structure serves multiple functions: reducing delay, providing redundancy, and maintaining compatibility with existing paging procedures.
Data Source
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AI summary
Disclosed in the present application are a paging method, a network device and a terminal device, the method comprising: a network device determines a paging time window for paging a terminal device, the paging time window comprising S candidate paging occasions (PO), S being a positive integer greater than 1; and the network device monitors whether a carrier on an unlicensed band is idle on the basis of the paging time window. Since the monitoring is not only performed at one PO but in a paging time window, the network device may have multiple paging message transmission opportunities in one paging cycle, so that the transmission delay of a paging message may be greatly reduced when paging is performed on an unlicensed band.