MBMS Service Information Acquisition in Closed Subscriber Group Cells
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Solution Overview
Problem
In mobile communication systems, mobile terminals cannot acquire MBMS data information when handover or cell selection occurs from a general cell to a specific cell that does not support MBMS data broadcasting, as the specific cell does not broadcast MBMS service information.
Innovation Solution
A mobile communication method where the specific cell broadcasts MBMS service update information indicating the timing of MBMS service information broadcast, allowing mobile terminals to receive this information from the specific cell, even when it is a standby cell, by acquiring service information from the E-UTRAN network and broadcasting it at the indicated timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a specific cell does not support MBMS data broadcasting to maintain closed subscriber group security and control, then network security and access control are improved, but mobile terminals cannot acquire MBMS service information when handover or cell selection occurs from general cell to specific cell
Solution Approach 1:
The patent introduces a general cell as an intermediary that broadcasts MBMS service information. When a mobile terminal is in a specific cell, it can still receive MBMS service information by tuning to the general cell's broadcast frequency. This intermediary approach allows the specific cell to maintain its closed security while enabling MBMS information acquisition through the general cell's broadcasting function.
2Loss of information
If a specific cell broadcasts MBMS service information to enable continuous acquisition by mobile terminals, then information availability is improved, but the specific cell's closed subscriber group characteristics and access control are compromised
Solution Approach 1:
The patent segments the broadcasting function from the specific cell and assigns it to a general cell instead. The specific cell maintains its closed subscriber group characteristics and access control, while the general cell handles the MBMS service information broadcasting. This segmentation allows both functions to coexist without compromising either security or information availability.
3Loss of information
If mobile terminals continuously monitor general cell for MBMS service information while in specific cell, then information acquisition is improved, but terminal power consumption and complexity increase
Solution Approach 1:
The patent implements periodic broadcasting of MBMS service information by the general cell at specific time intervals. Mobile terminals only need to monitor the general cell's broadcast at these predetermined periodic times rather than continuously, significantly reducing power consumption while ensuring timely acquisition of service information updates.
Data Source
AI summary
A mobile communication method comprises: a step A of broadcasting, from a specific cell, MBMS service update information indicating a timing of a broadcasting of MBMS service information indicating contents of MBMS data; a step B of broadcasting, from the specific cell, the MBMS service information at the timing indicated by the MBMS service update information; and a step C of receiving, by the mobile terminal existing in the specific cell, the MBMS service information broadcasted from the specific cell at the timing indicated by the MBMS service update information broadcasted from the specific cell.