Digital Broadcast Frame Synchronization for Low Bit Rate Services
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Solution Overview
Problem
Current digital broadcast networks face inefficiencies in transmitting low bit rate services, particularly in achieving fast access times and maximum power savings, as existing methods either sacrifice power savings for quick access or result in long waiting times during handover and channel zapping situations.
Innovation Solution
Incorporating pilot symbols at the beginning of digital broadcast frames for synchronization and signaling, allowing low bit rate services to be allocated to time slots following these symbols, enabling fast access and power conservation by powering off during higher bit rate service slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If low bit rate services are packed into the same bursts as higher bit rate services, then service access time is optimized, but power consumption increases
Solution Approach 1:
The patent segments the transport stream by creating separate logical channels: one for high bit rate services and another specifically for low bit rate services. This segmentation allows the receiver to selectively decode only the low bit rate service data when that service is being accessed, rather than decoding entire bursts containing mixed services. The segmentation resolves the contradiction by enabling fast access to low bit rate services while minimizing power consumption through selective decoding.
Solution Approach 2:
The patent implements preliminary action by placing low bit rate service data in dedicated time slots within the transport stream structure, positioned strategically to enable rapid access. The receiver can be pre-configured to monitor these specific time slots and wake up only when low bit rate service data is present, eliminating the need to decode entire bursts and thereby reducing power consumption while maintaining fast access times.
2Use of energy by moving object
If low bit rate services are packed into their own separate bursts with long off-time periods, then power savings are maximized, but service access time increases
Solution Approach 1:
The patent merges the advantages of both approaches by combining separate dedicated time slots for low bit rate services within the overall transport stream structure. This merging allows the system to maintain the power savings benefits of dedicated allocation while achieving fast access times through strategic positioning and synchronization of these time slots within the regular transport stream framework, eliminating the need for extremely long off-time periods.
3Use of energy by moving object
If time slicing is used to reduce power consumption by sending bursts at high bit rate, then power savings are achieved, but access time for low bit rate services increases
Solution Approach 1:
The patent applies local quality by creating localized dedicated time slots within the transport stream specifically optimized for low bit rate services. These local allocations have different characteristics from the overall high bit rate burst structure, allowing receivers to access low bit rate services quickly during these localized time periods while maintaining power savings through selective decoding, thus resolving the contradiction between power consumption and access time.
Data Source
AI summary
The invention is directed to efficient transfer of low bit rate services in a communication system. A synchronization symbol which has known characteristics may be included as a first symbol of digital broadcast frames. The synchronization symbol, which can be decoded without having to resort to trial and error methods, contains parameters for the rest of the signal. Low bit rate services are allocated to time slots following the pilot symbol used for synchronization allowing for fast access times with maximum power saving capabilities. A user terminal wakes up just before the synchronization symbol and received the data allocated for the low bit rate services. The user terminal may power off for the remaining time slots which are allocated for higher bit services to conserve power.