MBMS Control Information Overhead Reduction via Dynamic Key Update
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Solution Overview
Problem
Current mobile communication systems experience unnecessary overhead in transmitting Multimedia Broadcast/Multicast Service (MBMS) data due to the inclusion of key ID and random seed values in every data packet, even when the encryption key has not changed, which reduces the amount of actual data transmitted.
Innovation Solution
A method is introduced to transmit control information only when the encryption key used for MBMS data has been updated, using a data type indicator, version value, key ID, and random seed value to determine the necessary control information, thereby minimizing overhead by configuring MBMS data packets differently based on key updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If key ID and random seed values are included in every MBMS data packet, then encryption can be maintained, but control information overhead increases unnecessarily
Solution Approach 1:
The patent applies dynamics by making the control information structure adaptable - when key update occurs, full control information (key ID + random seed) is transmitted; when no key update occurs, only a flag is transmitted. This dynamic adjustment resolves the contradiction between maintaining encryption reliability and reducing control information overhead.
Solution Approach 2:
The patent changes the parameter of control information transmission based on the key update state. By detecting whether key update has occurred and adjusting the transmission content accordingly (full parameters vs. minimal flag), the system maintains encryption functionality while reducing unnecessary overhead.
2Reliability
If key ID and random seed values are transmitted in every data packet, then encryption keys are updated, but the amount of actual data transmitted decreases
Solution Approach 1:
The system dynamically adjusts the payload composition based on whether key update is needed. When keys are updated, the packet includes necessary control information; when not needed, the packet contains only actual data, thereby maximizing data transmission efficiency while maintaining security.
Solution Approach 2:
The patent applies partial action by transmitting only the necessary control information (flag) rather than full key parameters in every packet. This partial transmission approach maintains sufficient for encryption while minimizing overhead and maximizing data transmission efficiency.
3Reliability
If control information is included in all MBMS data packets, then encryption can be maintained, but transmission bandwidth is reduced
Solution Approach 1:
The control information transmission is made dynamic - full control information is sent only when key update occurs, otherwise only a minimal flag is transmitted. This dynamic approach maintains encryption reliability while preserving maximum transmission bandwidth for actual data.
Solution Approach 2:
The patent extracts the essential function of control information (indicating key update status) from the full key parameter set. By taking out only the necessary flag when key update hasn't occurred, the system maintains encryption functionality while freeing up bandwidth for data transmission.
Data Source
AI summary
A method for minimizing overhead occurring caused by control information for encryption performed to protect MBMS data for an MBMS service in a mobile communication system. This method is implemented by distinguishing a case in which control information used for encryption is updated from another case in which the control information used for encryption is not updated, and transmitting different control information according to the distinguishment result. That is, when the control information used for encryption is not updated, only minimized control information is transmitted, and when the control information for encryption is updated, the entire updated control information is transmitted. Accordingly, the amount of control information transmitted along with MBMS data is minimized, contributing to an increase in the amount of MBMS data transmitted per unit time.