Access-Prohibited CSG Cell Handover with Repeated Dedicated Commands
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Solution Overview
Problem
Existing handover techniques in radio communication systems are inefficient and time-consuming when transitioning between macro and CSG cells due to the need to determine access permission, which is often delayed by the uncertainty of system information transmission during gap periods.
Innovation Solution
Implementing a base station configuration that repeatedly transmits a dedicated handover command via a dedicated channel at intervals shorter than the terminal's data reception period, and optionally shortening system information transmission intervals to ensure timely access permission judgment and handover execution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal waits for system information transmission during gap periods to determine access permission, then access control accuracy is improved, but handover time increases
Solution Approach 1:
The base station pre-generates and stores dedicated handover command messages before the handover process begins. When handover is triggered, the terminal can immediately receive the pre-prepared command without waiting for system information transmission during gap periods, thus reducing handover time while maintaining access control accuracy through the dedicated command channel
Solution Approach 2:
A dedicated handover command message serves as an intermediary carrier that conveys access permission information and handover instructions from the base station to the terminal. This dedicated message bypasses the need for the terminal to monitor and decode system information during gap periods, directly providing the necessary access control information and reducing handover delay
2Reliability
If the base station transmits system information at regular intervals, then information transmission reliability is improved, but handover responsiveness deteriorates
Solution Approach 1:
The patent extracts critical handover information (access permission, handover commands) from the regular system information transmission and places it into dedicated handover command messages. This allows the base station to maintain regular system information transmission for reliability while simultaneously providing immediate handover instructions through the dedicated channel when handover is needed, thus improving responsiveness without sacrificing overall information transmission reliability
Solution Approach 2:
The base station dynamically switches between two transmission modes: regular system information transmission for general reliability, and dedicated handover command transmission for rapid handover execution. This dynamic approach allows the system to adapt to different operational requirements, maintaining reliability through regular transmissions while achieving fast handover responsiveness when needed
Data Source
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AI summary
When a handover request for performing a handover of a terminal (70) from a macro cell C1 to a CSG cell C2 is received from an SeNB 10 (S8), a base station (TeNB) (40) of the CSG cell C2 transmits a handover response in accordance with a handover enabled/disabled state (S12). The handover response includes an identifier of the terminal (70) in the CSG cell C2. Upon receiving the response, the SeNB (10) notifies the identifier to the terminal (70) (S14). The TeNB (40) repeatedly transmits a dedicated signal containing a handover command via a dedicated channel set using the identifier at an interval shorter than a gap period (S18). Accordingly, whether or not access is permitted can be judged promptly and a smooth handover can be realized.