Wireless Cloud Cell Mobility Management via Control Data Master Separation
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Solution Overview
Problem
The next-generation wireless communication system using high-frequency bands like millimeter waves reduces communication distance between Mobile Stations (MS) and Base Stations (BS), leading to decreased cell radius, increased number of BSs, and higher system resource consumption, making centralized network structures undesirable.
Innovation Solution
A wireless communication system with a flat network structure where BSs are directly connected to the Internet, allowing for independent management of control signaling and data flow functions, with a 'control master' and 'data master' within a BS set that can transfer functions between BSs to maintain seamless service and reduce IP mobility events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-frequency bands like millimeter waves are used to support large-capacity data service, then data service capacity is improved, but communication distance between MS and BS decreases
Solution Approach 1:
The patent segments the master BS function into two independent parts: control signaling function and data flow management function. This allows these functions to be handled by different BSs, enabling the system to maintain large-capacity data service while managing the reduced communication distance through coordinated multi-BS operation.
Solution Approach 2:
The patent introduces a flat network structure where multiple BSs directly connect to the Internet without requiring a centralized access gateway. This intermediary architecture enables distributed data flow management, allowing data services to continue seamlessly even when communication distance is limited by high-frequency band usage.
2Measurement precision
If cell radius is decreased due to high-frequency band usage, then frequency selectivity is improved, but the number of BSs required increases
Solution Approach 1:
The patent merges the control signaling function and data flow management function into a unified mobility management framework, where these functions can be performed by the same or different BSs. This combination allows the system to efficiently utilize the available BSs without requiring excessive deployment, even with reduced cell radius.
Solution Approach 2:
The patent implements dynamic function transfer between BSs, where the control master and data master can be changed based on MS mobility and network conditions. This dynamic adaptation allows the system to optimize BS utilization and reduce the total number of BSs needed while maintaining frequency selectivity benefits.
3Area of stationary object
If the number of BSs is increased to provide service area, then service coverage is improved, but handover frequency increases
Solution Approach 1:
By separating control signaling and data flow management functions, the patent enables independent optimization of handover procedures. The control master can be changed with minimal impact on data flow, reducing the frequency and complexity of handovers while maintaining service area coverage.
Solution Approach 2:
The patent ensures continuous data flow management even during control master changes by allowing the data master to remain unchanged or be transferred independently. This continuity reduces the disruption and frequency of effective handovers, maintaining service coverage while minimizing handover-related time loss.
4Ease of operation
If centralized network structure is used, then control management is simplified, but processing capacity of access gateway increases
Solution Approach 1:
The patent extracts the data flow management function from the centralized access gateway and distributes it to individual BSs. This extraction reduces the processing capacity requirements of any single access gateway while maintaining simplified control management through the control master BS.
Solution Approach 2:
The patent transitions from a vertical centralized architecture to a horizontal flat network structure where multiple BSs directly connect to the Internet. This dimensional change distributes processing capacity across multiple nodes while maintaining control management simplicity through the control master, eliminating the need for high-capacity centralized gateways.
Data Source
Figure 1A~1B
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AI summary
Mobility management in a wireless communication system supporting a Base Station set is provided. The system includes a plurality of BSs directly connected to the Internet without an upper node, and configured to provide wireless access to at least one Mobile Station (MS). The BSs construct a cloud cell for providing service to the at least one MS, and a first BS of the plurality of BSs functions as a control master and is configured to perform control signaling with the at least one MS, and a second BS of the plurality of BSs functions as a data master and is configured to perform scheduling for service provision through the cloud cell and to operate as an Internet Protocol (IP) endpoint of the at least one MS.