DMB Terminal Handover via Frame Slicing and RF Reuse
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Solution Overview
Problem
Current digital multimedia broadcasting systems face challenges in reducing power consumption and achieving seamless handover in mobile terminals, particularly due to the lack of efficient frequency switching mechanisms, which result in service interruptions and increased power consumption.
Innovation Solution
The implementation of a frame slicing technique that allows for the transmission and reception of broadcast data using frame groups with headers and signal frames across different frequencies, enabling the terminal to efficiently check burst arrival times, compare signal power/quality, and switch frequencies seamlessly without a separate RF stage, thereby reducing power consumption and ensuring smooth handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate RF stage is added to enable seamless handover and frequency scanning, then handover smoothness is improved, but receiver cost increases
Solution Approach 1:
The existing RF stage is made multi-functional by enabling it to perform both normal reception and frequency scanning functions. The controller directs the single RF stage to switch between receiving broadcast signals on the current frequency and scanning other frequencies for handover, eliminating the need for a separate RF unit while maintaining seamless handover capability
Solution Approach 2:
The system dynamically switches the RF stage between different operational modes (normal reception mode and frequency scanning mode) based on handover requirements. The controller dynamically allocates the RF stage to different tasks at different times, enabling seamless handover without requiring dedicated hardware for each function
2Reliability
If the receiver continuously monitors all frequencies to ensure seamless handover, then handover smoothness is improved, but power consumption increases
Solution Approach 1:
Instead of continuous monitoring, the system periodically scans frequencies at intervals. The controller schedules frequency scanning to occur at specific time points rather than continuously, reducing power consumption while still detecting available frequencies for handover when needed
Solution Approach 2:
The system performs preliminary frequency scanning and detection before handover is actually required. By proactively identifying available frequencies and their signal qualities in advance, the system prepares handover information beforehand, reducing the need for continuous monitoring and lowering overall power consumption
Data Source
AI summary
A handover method and apparatus in a digital multimedia broadcasting (DMB) system that transmits/receives broadcast data through a frame group using different frequencies. A handover method includes receiving a first frame group header at a serving frequency, and receiving a burst of the desired service at the serving frequency according to a burst arrival time; calculating a first relative start time of a next frame group header; turning power off until a current time arrives at a next header arrival time; receiving a second frame group header at a searching frequency, and acquiring service information of the searching frequency necessary for handover to the searching frequency; returning to the serving frequency and turning the power off; and comparing signal power/quality of the listened frequencies with each other to select a best frequency, and switching to the selected frequency using the acquired corresponding service information.