Macro Base Station Paging Coordination for Small Cell Spectrum Uncertainty
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Solution Overview
Problem
Wireless communications systems face inefficiencies in paging operations due to the uncertainty of unlicensed spectrum availability and the large number of small cell base stations, which complicates scheduling and decision-making for core network nodes.
Innovation Solution
A method and apparatus for efficient paging in communications systems that involve determining a set of base stations, including small cell base stations, to attempt paging using either licensed or unlicensed spectrum, based on historical and mobility information, and sending paging requests and responses with failure cause codes to manage paging attempts effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the core network node individually manages each small cell base station for paging operations, then the paging coverage is comprehensive, but the management complexity and signaling overhead increase significantly
Solution Approach 1:
The patent merges the management of multiple small cell base stations into a single macro base station. The macro base station receives paging requests from the core network node and distributes them to relevant small cell base stations, consolidating management functions and reducing signaling overhead while maintaining comprehensive coverage.
Solution Approach 2:
The macro base station acts as an intermediary between the core network node and small cell base stations. It receives paging requests from the core network, determines which small cells should page the UE based on location and spectrum availability, and coordinates the paging attempts, thereby simplifying the core network's management burden.
2Adaptability or versatility
If paging operations use unlicensed spectrum, then spectrum utilization is flexible, but transmission availability becomes uncertain
Solution Approach 1:
The macro base station performs preliminary channel availability checks before transmitting paging signals on unlicensed spectrum. It determines whether the unlicensed channel is available at the time of paging transmission, and only proceeds with transmission if the channel is clear, thereby managing the uncertainty of spectrum availability proactively.
Solution Approach 2:
The system implements feedback mechanisms where base stations report channel availability status and paging results back to the macro base station and core network node. This feedback loop enables dynamic adaptation to spectrum conditions, allowing the system to adjust paging strategies based on real-time availability information.
3Device complexity
If the core network node does not receive feedback on paging failure reasons, then signaling is simplified, but the ability to make informed paging decisions is reduced
Solution Approach 1:
The patent introduces feedback messages from base stations to the core network node that include failure cause information. When paging fails, the base station reports the reason (e.g., UE not found, channel unavailable), enabling the core network to make informed decisions about retry strategies and paging area adjustments without excessive signaling complexity.
Data Source
AI summary
Efficient paging in a communications system including macro and small cell base stations is described. A macro cell base station receives, from a network node, a request to page a UE and determines a set of base stations including one or more small cell base stations, which are to attempt to page the UE. The macro cell base station communicates the paging request to the selected one or more small cell base stations. A small cell base station, using unlicensed spectrum, may fail in its paging attempt due to current unavailability of the unlicensed spectrum (LBT fails to clear) resulting in no paging signal transmitted; the reason for failure is communicated from the small cell base station to the macro cell base station via a paging response message. The macro cell base station in turn communicates a paging response message to the network node communicating the reason for failure.