CMTS Per-Device Buffering for Wireless Base Stations
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Solution Overview
Problem
Existing cable modem termination systems (CMTS) lack information about connected wireless base stations and user equipment devices, leading to data loss and service degradation due to buffer overflows and inefficient data communication.
Innovation Solution
Implementing a buffer management mode of operation in CMTS to create separate data buffers for each user equipment device, allowing for dynamic management and coordination of downlink data transmission based on device-specific needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a CMTS uses a single buffer for each cable modem without device-specific buffering, then the device complexity is reduced, but data loss occurs due to buffer overflows when multiple user equipment devices with different data needs are served
Solution Approach 1:
The patent segments the single buffer per cable modem into multiple device-specific buffers within the wireless base station. Each user equipment device gets its own buffer (1120, 1122, 1124, 1126) to prevent overflow, while the CMTS maintains a single buffer (1102) per cable modem. This segmentation resolves the contradiction by improving data delivery reliability through device-specific buffering while keeping the CMTS structure relatively simple.
Solution Approach 2:
The wireless base station acts as an intermediary between the CMTS and user equipment devices. It receives data from the CMTS buffer and redistributes it to appropriate device-specific buffers, managing the complexity of device-specific buffering at the edge rather than at the CMTS core. This mediator approach improves reliability while distributing complexity to where it's most needed.
2Productivity
If the CMTS sends downlink data continuously to the wireless base station, then the productivity of data transmission is improved, but data is lost when the wireless base station buffer is full and cannot save incoming data
Solution Approach 1:
The patent implements feedback mechanisms where the wireless base station monitors buffer status and communicates with the CMTS to regulate data flow. When device-specific buffers are full, the base station can signal the CMTS to pause or reduce data transmission for affected cable modems, preventing data loss while maintaining high transmission efficiency when buffers have capacity.
Solution Approach 2:
The system dynamically adjusts data transmission rates from the CMTS to the wireless base station based on real-time buffer status. Transmission is accelerated when buffers have capacity and slowed or paused when buffers are full, creating a dynamic balance between transmission productivity and data integrity that adapts to changing network conditions.
3Reliability
If the CMTS creates separate buffers for each user equipment device, then data loss is minimized through precise buffer management, but the device complexity and operational overhead increase significantly
Solution Approach 1:
The patent segments buffering responsibilities between two levels: the CMTS maintains simple per-cable-modem buffers, while the wireless base station creates device-specific buffers for each user equipment device. This segmentation prevents data loss through precise buffer management at the edge where device information is available, while keeping the CMTS operationally simple by avoiding the need for it to manage complex device-specific buffering.
Data Source
AI summary
The presentation invention relates to methods and apparatus for coordinating the buffering and transmission of data between a Cable Modem Termination System (CMTS) and a wireless base station. An exemplary method in accordance with one embodiment includes the steps of: receiving a buffer management mode message at a CMTS from a wireless base station; switching, by the CMTS, from operating in a first mode of operation to operating in a second mode of operation with respect to buffering and communicating downlink data to the wireless base station; and while operating in the second mode of operation: (i) creating a plurality of CMTS downlink data buffers, each of the plurality of CMTS downlink data buffers corresponding to a different user equipment device to which the wireless base station is actively providing services; and (ii) storing a received downlink data packet in one of the plurality of CMTS downlink data buffers.