Virtual Channel Mapping for Bandwidth Conservation in Cable Networks
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Solution Overview
Problem
Current cable network technologies lack an effective mechanism to conserve and optimize bandwidth for both standard definition (SD) and high definition (HD) services, leading to inefficient use of bandwidth and inability to dynamically adjust service mixtures based on parameters like time of day or service area, especially in simulcast scenarios.
Innovation Solution
The method involves scheduling SD content on multiple user channels simultaneously, mapping these channels to a single physical channel, and selectively tuning users to this channel based on scheduling information, allowing for bandwidth conservation by eliminating the need for separate physical channels for SD and HD simulcasts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate physical channels are allocated for SD and HD simulcasts, then service quality is improved, but bandwidth utilization deteriorates
Solution Approach 1:
The patent merges SD and HD simulcast traffic onto a single physical channel by implementing virtual channel mapping. Multiple virtual channels (V1, V2, etc.) are mapped to one physical channel, allowing SD and HD content to share the same bandwidth resource through time-division multiplexing and packet prioritization mechanisms.
Solution Approach 2:
The physical channel is designed to serve multiple functions simultaneously - carrying both SD and HD simulcast traffic, as well as on-demand content. The system dynamically allocates bandwidth based on service type and priority, making the single physical channel universal for multiple service deliveries.
2Adaptability or versatility
If multiple physical channels are used for SD content delivery, then service coverage is improved, but network infrastructure complexity worsens
Solution Approach 1:
The patent transitions from physical channel dimension to virtual channel dimension. Instead of creating multiple physical channels for different services, the system creates multiple virtual channels within a single physical channel, adding a logical layer of multiplexing that increases service coverage without physical infrastructure expansion.
Solution Approach 2:
A channel mapping table and packet prioritization mechanism act as intermediaries between the physical channel and multiple virtual channels. This intermediary layer enables complex service delivery patterns without requiring corresponding physical infrastructure complexity.
3Productivity
If dynamic service level adjustments are implemented, then bandwidth efficiency is improved, but system control complexity worsens
Solution Approach 1:
The system implements dynamic bandwidth allocation where virtual channel mappings and packet priorities are adjusted in real-time based on service demands. SD and HD simulcast ratios, as well as on-demand content allocation, are dynamically modified without changing the underlying physical channel infrastructure.
Solution Approach 2:
The system uses feedback mechanisms to monitor bandwidth utilization and service quality, then adjusts virtual channel mappings and packet prioritization accordingly. This feedback loop enables automatic optimization of bandwidth efficiency while maintaining service quality standards.
Data Source
AI summary
Methods and apparatus for conserving bandwidth within a network based on two or more different service levels. In an exemplary embodiment, programming that is simulcast on two or more program channels is mapped to one physical channel during periods when the programming is scheduled at only one service level (e.g., standard definition), thereby conserving bandwidth on the network that would otherwise be consumed by the simultaneous broadcast on the two or more channels. When the programming service level becomes heterogeneous across the channels (e.g., SD and HD simulcast), physical channel(s) supporting the HD content are provided within a local service area only “on-demand” using, for example, a switched digital channel allocation. Accordingly, no HD broadcast occurs within a given area until at least one user requests it, thereby further conserving network bandwidth.