Logical Channel Mapping for Variable Bit Rate Allocation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems, such as MediaFLO and DVB-H, face inefficiencies due to fixed data rate ratios between modulation layers, which do not adapt well to variable bit rates produced by codecs like H.264 for video or stereo audio, leading to imbalanced bit rate proportions.
Innovation Solution
The proposed solution involves logical channel mapping that allows for variable bit rate ratios by distributing data from layered codec blocks across multiple logical channels, where one channel supports multiple hierarchical data channels and another supports a single data channel, enabling flexible allocation of essential and optional data across modulation layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed allocation of modulation states to layers is used, then hierarchical data channels can be created, but the data rate ratio among layers becomes fixed and cannot adapt to variable bit rate requirements
Solution Approach 1:
The patent implements dynamic bit rate allocation across modulation layers by allowing the data rate ratio between base layer and enhancement layer to vary based on content requirements. Instead of fixed allocation, the system dynamically adjusts the number of bits allocated to each layer, enabling adaptation to different motion content and audio characteristics while maintaining the hierarchical modulation structure.
Solution Approach 2:
The system changes the parameter of bit rate ratio between modulation layers from a fixed value to a variable parameter. By modifying the data rate allocation parameters dynamically, the system can optimize transmission efficiency for different content types (high motion vs. low motion video, stereo audio configurations) without changing the fundamental hierarchical modulation architecture.
2Productivity
If hierarchical layered modulation with fixed data rate ratio is used, then transmission structure is simplified, but resource utilization efficiency decreases due to inability to match codec variable bit rate output
Solution Approach 1:
The patent segments the data stream into base layer and enhancement layer data with flexible bit rate allocation. By dividing the coded data into distinct layers that can be independently allocated across modulation states, the system achieves better resource utilization while maintaining manageable complexity through structured segmentation of the data flow.
Solution Approach 2:
The hierarchical modulation structure is designed to serve multiple functions: it supports both video and audio content types, accommodates different motion characteristics, and allows flexible bit rate allocation. This multi-functionality enables the same modulation framework to adapt to various content requirements without requiring separate specialized structures for each case.
3Loss of energy
If integer or rational fractional data rate ratios are used between layers, then modulation scheme is simplified, but bandwidth efficiency is reduced due to mismatch with actual content bit rate requirements
Solution Approach 1:
The system dynamically adjusts the bit rate ratio between enhancement layer and base layer to match actual content requirements. Instead of being constrained to fixed integer or rational ratios, the data rate allocation is continuously adaptable based on motion content analysis and audio characteristics, minimizing bandwidth waste while keeping the mapping algorithm computationally feasible.
Data Source
AI summary
Methods, systems, and apparatus, including computer programs encoded on computer readable storage media, for increasing utilization of transmission resources by mapping data from a block of layered codec data onto a plurality of logical channels for transmission of the mapped data. Resource utilization may also be improved by mapping data from at least two layers of a block of layered of codec data onto a logical channel that supports only a single data channel carried by a transmit modulation scheme.