Paging Method Reducing Beam Sweeping Overhead in High-Frequency Systems
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Solution Overview
Problem
High-frequency communication systems face challenges in achieving omnidirectional coverage due to the need for narrow beams, which increases overheads and complicates the design of broadcast, control, and synchronization channels, especially when UE is in idle mode and lacks a maintained beam pair with the base station.
Innovation Solution
The method involves sending paging-related information through a physical downlink control channel (PDCCH) with specific timing, using P-RNTI and DCI, and optionally including part of the paging message, to reduce the need for beam sweeping and indicate resource locations for the UE, allowing for omnidirectional beam traversal and efficient resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If narrow beams are used for high-frequency communication, then transmission distance and beam gain are improved, but coverage area is reduced and beam alignment complexity increases
Solution Approach 1:
The patent segments the paging process into two parts: first sending paging indication information via PDCCH in omnidirectional mode, then sending the actual paging message via PDSCH using narrow directional beams. This segmentation allows the system to use omnidirectional transmission for coverage and narrow beams for targeted delivery, resolving the contradiction between coverage area and beam gain.
2Area of stationary object
If all directional-beam combinations are traversed to achieve omnidirectional coverage, then coverage is improved, but overhead increases sharply
Solution Approach 1:
The patent extracts the omnidirectional coverage function from the narrow-beam paging mechanism by using omnidirectional PDCCH for paging indication. This separates the coverage requirement from the targeted message delivery, allowing omnidirectional coverage to be achieved without traversing all directional-beam combinations, thus reducing overhead.
3Reliability
If beam sweeping is performed periodically for paging, then coverage is maintained, but power consumption and overhead increase
Solution Approach 1:
The patent performs preliminary omnidirectional paging indication via PDCCH before sending the actual paging message. This preliminary action allows the UE to be notified of incoming paging without requiring periodic beam sweeping, reducing power consumption while maintaining reliable coverage. The narrow beam is only used for the actual message transmission when needed.
Data Source
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AI summary
Embodiments of this application provide a paging method, including: sending, by a network device, paging-related information at a specified time, where the paging-related information is sent in a beam sweeping manner. A paging message is obtained based on the paging-related information, to reduce paging overheads.