Dynamic Profiles for Per-Minislot OFDMA Cable Transmission
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Solution Overview
Problem
Existing cable transmission systems face challenges in determining performance information at a per-resource level, such as per-minislot, and are inefficient in adjusting bit-loading patterns due to limited profile support and slow profile changes, leading to difficulties in compensating for channel impairments.
Innovation Solution
The system obtains performance metrics at a per-resource level by scheduling single-minislot bursts and dynamically adjusts bit-loading profiles on a per-resource basis without requiring communication with cable modems, using techniques like single-minislot grants and grouping CMs for real-time performance measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic bit-loading adjustments are implemented on a per-resource basis, then adaptability to channel impairments is improved, but device complexity increases due to the need for per-minislot performance measurement and dynamic profile generation
Solution Approach 1:
The patent segments the OFDMA channel into multiple minislots and applies different bit-loading profiles to each minislot based on its specific performance characteristics. This segmentation allows the system to treat each resource unit independently, enabling fine-grained adaptation to channel impairments without requiring complete reconfiguration of the entire channel.
Solution Approach 2:
The patent implements dynamic bit-loading adjustments where the CMTS continuously monitors per-minislot performance metrics and updates bit-loading profiles in real-time based on current channel conditions. This dynamic approach allows the system to adapt quickly to changing noise conditions and impairments, improving versatility while managing complexity through automated feedback mechanisms.
2Measurement precision
If per-resource performance measurement is implemented, then measurement precision is improved, but loss of time increases due to the overhead of scheduling single-minislot bursts for measurement
Solution Approach 1:
The patent merges performance measurement activities with regular data transmission by scheduling single-minislot bursts that serve dual purposes: delivering data while simultaneously providing measurement opportunities. This combining of measurement and data transmission reduces the time loss associated with dedicated measurement periods while maintaining high measurement precision through per-minislot monitoring.
Solution Approach 2:
The patent implements continuous performance monitoring by systematically scheduling single-minislot bursts across different time frames and CM groups. This continuous measurement approach ensures that performance data is constantly updated without significant interruptions to data transmission, maintaining both measurement precision and time efficiency through ongoing useful action.
3Productivity
If single-minislot bursts are scheduled for performance measurement, then productivity is improved through faster adaptation, but loss of substance increases due to reduced data transmission efficiency during measurement periods
Solution Approach 1:
The patent applies partial measurement action by scheduling single-minislot bursts selectively for performance measurement rather than continuously for all resources. This partial approach allows the system to obtain sufficient performance data for dynamic profile adjustment while minimizing the impact on overall data transmission efficiency, achieving a balance between adaptation speed and transmission efficiency.
Solution Approach 2:
The patent recovers measurement opportunities from what would otherwise be idle or underutilized minislot resources. By scheduling single-minislot bursts during periods when full-resource transmission is not optimal, the system converts potentially wasted resources into valuable measurement opportunities, improving adaptation speed without significant loss of data transmission efficiency.
Data Source
AI summary
The techniques described herein relate to methods, apparatus, and computer readable media configured to schedule individual orthogonal frequency-division multiple access (OFDMA) resources on an upstream channel to serve a data transmission request from a downstream device. A schedule for a set of available resources on the upstream channel to serve the data transmission request is generated, based on a dynamic bit loading profile, including generating data indicative of a first bit loading profile for a first set of resources from the set of available resources for a first burst, and data indicative of a second bit loading profile for a second set of resources from the set of available resources for a second burst. The schedule is transmitted to a downstream device, such that the downstream device is configured to encode the first burst using the first bit loading profile and the second burst using the second bit loading profile.