Wireless Idle Mode Operation for Small Cell Signaling Reduction
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Solution Overview
Problem
In high-frequency wireless communication systems, the reduced cell radius and increased number of base stations lead to frequent handovers, resulting in high signaling overhead and system resource consumption, making centralized network structures difficult to apply in small-cell environments. Additionally, the existing idle mode operations in flat networks with numerous small base stations require efficient management to reduce system load and increase data rates.
Innovation Solution
A method and apparatus for operating an idle mode in a wireless communication system that allows Mobile Stations (MS) to select between idle and semi-idle modes, where BSs in a semi-idle paging group broadcast paging messages, reducing unnecessary signaling and allowing for efficient handovers between distributed small base stations. This involves a paging controller that determines whether to enter an idle or semi-idle mode based on conditions such as signal strength and mobility, optimizing the transition between modes to conserve resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a centralized network structure is used, then system management is simplified, but the processing capacity requirements increase and cannot be applied in small-cell environments
Solution Approach 1:
The patent segments the centralized network structure into distributed small base stations organized in clusters. Each small BS is independently managed but grouped into clusters that function as virtual cells, reducing the processing burden on any single node while maintaining coordinated operation across the network
Solution Approach 2:
The patent introduces a hierarchical dimension to the network structure by organizing small BSs into clusters and defining multiple operational modes (idle, semi-idle, active). This dimensional organization allows simplified management at the cluster level while enabling distributed operation at the individual BS level
2Productivity
If numerous small base stations are deployed, then data rate is increased, but signaling overhead and system resource consumption increase due to frequent handovers
Solution Approach 1:
The patent merges multiple small base stations into clusters that operate as virtual cells. By combining the functionality of multiple small BSs into a coordinated cluster, the system reduces handover frequency and signaling overhead while maintaining the high data rate capabilities provided by the distributed small cell architecture
Solution Approach 2:
The patent introduces dynamic operational modes (idle, semi-idle, active) that allow small base stations to adapt their behavior based on traffic conditions and user location. This dynamic operation reduces unnecessary signaling and resource consumption while maintaining service quality
3Use of energy by moving object
If a Mobile Station enters idle mode in a flat network with many base stations, then power consumption is reduced, but location update complexity increases
Solution Approach 1:
The patent introduces clusters as intermediary entities between the mobile station and the core network. The cluster acts as a mediator that tracks the mobile station's location within the cluster, simplifying location updates compared to tracking across individual small base stations while still enabling efficient paging and communication
Data Source
AI summary
Provided is a method and apparatus for operating an idle mode in a wireless communication system. The method includes receiving a first message requesting entry to an idle mode from a Subscriber Station (SS) through at least one Base Station (BS), selecting in response to reception of the first message whether the MS is to enter an idle mode in which BSs belonging to a paging group broadcast a paging message for the MS or whether the MS is to enter a semi-idle mode in which BSs belonging to a semi-idle paging group, which is a subset of the paging group, broadcast the paging message for the SS, and transmitting Paging announce information instructing the BSs belonging to the semi-idle paging group to broadcast the paging message for the SS, if the semi-idle mode is selected.