Distributed Paging Gateway for Selective Small-Cell Reachability
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Solution Overview
Problem
In multi-cell LTE architectures, existing paging mechanisms consume excessive radio resources and processing time due to the need to send paging messages to all cells supported by each vBBU, even when the user equipment (UE) is likely to be in a specific subset of those cells.
Innovation Solution
Implement a gateway (HNG) that acts as a virtual core network, using a private information element (IE) to recommend specific cell IDs based on UE activity and heuristic information, reducing the number of cells that need to be paged by sending optimized paging requests through a REROUTE-PAGING-INDICATION message to the mobility management entity (MME).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If paging messages are sent to all cells supported by each vBBU, then all user equipment can be reached, but radio resource usage and processing time increase excessively
Solution Approach 1:
The patent applies local quality by differentiating paging treatment across different cell types. Macro cells receive paging messages for broad coverage, while small cells use localized paging only when UE is determined to be present there. This selective approach ensures reliable paging delivery while minimizing unnecessary radio resource consumption in small cells.
Solution Approach 2:
The patent segments the paging process into two distinct phases: initial paging at macro cell level for all UEs, followed by conditional secondary paging at small cell level only for UEs determined to be present. This segmentation allows the system to maintain comprehensive coverage while reducing overall paging traffic and resource usage.
2Reliability
If paging messages are sent to all cells supported by each vBBU, then all user equipment can be reached, but processing time increases excessively
Solution Approach 1:
The patent implements preliminary action by first sending paging messages to macro cells before small cells. The system waits for a determination period to see if UE responds at the macro cell level, then conditionally proceeds to small cell paging only if necessary. This preliminary filtering reduces overall processing time by avoiding unnecessary small cell paging operations.
Solution Approach 2:
The patent applies dynamics by making the small cell paging process conditional and adaptive. Small cell paging is dynamically activated only when UE presence is determined through macro cell paging response analysis or location information, rather than being a static all-or-nothing approach. This dynamic adjustment optimizes processing time based on actual UE location probability.
3Loss of energy
If distributed paging optimization is implemented using gateway recommendations, then radio resource usage decreases, but system complexity increases
Solution Approach 1:
The patent introduces a gateway as an intermediary component that coordinates between core network, macro cells, and small cells. The gateway receives paging requests, determines UE presence probability using location information and heuristics, and selectively forwards paging to appropriate small cells. This intermediary approach simplifies the overall system architecture by centralizing the decision logic rather than requiring complex distributed intelligence at each cell.
Solution Approach 2:
The patent implements feedback mechanisms where the gateway monitors UE responses to paging messages and uses this information to refine future paging decisions. Location information from UEs is fed back to the gateway to improve accuracy of presence determination, creating a learning system that optimizes paging resource usage over time while maintaining simple per-cell operations.
Data Source
AI summary
A method is disclosed for providing distributed paging optimization, the method comprising: connecting a group of radio access network nodes, each supporting multiple small cells, to a gateway which acts as a virtual core network to the multiple small cells and acts as an eNodeB virtualizing the multiple small cells toward a core network; sending, by the gateway, in response to a paging request from the core network, a plurality of recommended cell IDs or base stations using a private information element (IE) in a paging request; and sending paging requests in response to the paging request from the core network to only the plurality of cell IDs or base stations recommended by the gateway.