ATSC-MH Slot Allocation for Mobile Video Bitrate Precision
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Solution Overview
Problem
The ATSC-MH standard for mobile broadcasting experiences significant bitrate jumps when adjusting bitrates for mobile terminals, leading to inefficient allocation of slots and resulting in bitrate losses, as existing methods require excessive allocation of additional slots per frame to meet increased bitrate demands.
Innovation Solution
A method that allocates slots across a series of frames, allowing for a more precise adjustment of bitrates by distributing slots unevenly across a super frame, ensuring that at least two frames have different slot allocations for a service, thereby minimizing bitrate jumps and optimizing the use of available bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If slots are allocated per frame with fixed pattern, then allocation simplicity is maintained, but bitrate precision deteriorates
Solution Approach 1:
The invention segments the bitrate allocation problem by introducing a super-frame structure that groups multiple frames together. Within this super-frame, slots are allocated differently across constituent frames, allowing fine-grained bitrate control while maintaining overall allocation simplicity through the hierarchical structure.
Solution Approach 2:
The invention introduces dynamic slot allocation across frames within a super-frame. Instead of a static per-frame pattern, the system dynamically adjusts slot distribution to achieve precise bitrate control, with at least two frames having different slot allocations for the same service.
2Power
If additional slots are allocated per frame to increase bitrate, then bitrate increase is achieved, but bitrate efficiency deteriorates
Solution Approach 1:
The invention applies local quality by allocating slots unevenly across different frames within a super-frame. Instead of uniformly increasing slots in every frame, specific frames receive additional slots based on local bitrate requirements, achieving precise bitrate control without excessive allocation.
Solution Approach 2:
The invention changes the allocation parameter from a fixed per-frame basis to a variable super-frame basis. By adjusting the number of slots in different frames within a super-frame, the system achieves continuous bitrate adjustment with fine granularity, improving bitrate efficiency.
3Reliability
If slot allocation follows standard order, then standard compliance is maintained, but bitrate control flexibility deteriorates
Solution Approach 1:
The invention adds another dimension to slot allocation by introducing the super-frame time dimension. While maintaining standard compliance within individual frames, the system achieves enhanced bitrate control flexibility by varying slot allocations across the super-frame dimension, allowing at least two frames to have different slot counts for the same service.
Data Source
AI summary
Method of formatting a stream of data for mobile terminals according to a series of frames which comply with the ATSC-MH standard or with a standard which is upward compatible with ATSC-MH, a frame comprising a predetermined number of slots, each slot being able to be allocated to the transport of data associated with a service, said method comprising a step of defining a slots allocation pattern making it possible to meet a total bitrate need required for the services for a set, called a super frame, grouping together M frames, M being greater than 1, consisting in:Allocating a minimum number N of slots for each frame of a super frame as a function of the total bitrate need and of the bitrate allocated to a slot,Allocating an additional slot in a predetermined number p of frames of a super frame, so as to comply with the total bitrate need with a minimum bitrate stepsize equal to the bitrate allocated to a slot.