Femto Base Station Group Handover Method
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Solution Overview
Problem
In wireless communication systems with multiple femto base stations, the frequent handover process between these stations leads to significant delay and wastage of radio resources due to the need for frequent communication and scanning procedures.
Innovation Solution
A method where multiple femto base stations form a single group, allowing seamless handover by sharing context and negotiating common uplink resources, enabling efficient network re-entry with reduced scanning and message exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequent handover process is performed between multiple femto base stations, then terminal can maintain connection quality, but handover delay increases and radio resources are wasted
Solution Approach 1:
Multiple femto base stations are merged into a single group with a group ID, allowing the terminal to perform scanning and handover based on group level rather than individual base station level. This reduces the number of scanning operations and message exchanges required during handover, thereby reducing delay while maintaining connection quality.
Solution Approach 2:
The network pre-configures uplink resources and context information for multiple femto base stations in advance. When handover is needed, the terminal can immediately use the pre-configured resources without waiting for resource negotiation, significantly reducing handover delay while ensuring reliable connection maintenance.
2Reliability
If frequent handover process is performed between multiple femto base stations, then terminal can maintain connection quality, but radio resources are wasted
Solution Approach 1:
By merging multiple femto base stations into a single group, the terminal performs scanning and handover procedures at the group level rather than individually for each base station. This consolidation reduces the number of message exchanges and scanning operations, conserving radio resources while maintaining the ability to switch between base stations for connection quality.
Solution Approach 2:
Uplink resources and context information are pre-configured for multiple femto base stations before handover occurs. This eliminates the need for resource negotiation during handover, reducing radio resource consumption while ensuring seamless connection maintenance.
3Loss of time
If group-based handover is implemented, then handover delay is reduced, but device complexity increases
Solution Approach 1:
The group ID serves multiple functions: it identifies the group of femto base stations, enables scanning at group level, and facilitates handover decisions. This multi-functionality reduces the need for separate mechanisms, actually simplifying the system while achieving faster handover.
Solution Approach 2:
The terminal stores context information and uplink resource configurations as templates that can be reused across multiple femto base stations in the group. This copying approach eliminates the need to negotiate resources separately with each base station, reducing handover delay without significantly increasing complexity.
Data Source
AI summary
The present invention relates to methods for performing fast handover by a terminal in an environment in which multiple femto base stations exist. A method for performing handover by a terminal includes transmitting, to a serving femto base station, a message for requesting seamless handover within a group including multiple femto base stations, the serving femto base station belonging to the group; receiving, from the serving femto base station, first command message including power information and allocation information; broadcasting an uplink signal that is applied with transmission power indicated by the power information, through an uplink resource indicated by the allocation information; receiving second command messages including measurements of the uplink signal measured by the multiple femto base stations from the serving femto base stations; and performing network re-entry to a target base station among the femto base stations.