Cable Modem DHCP Request Prioritization via Flow Control
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Solution Overview
Problem
The existing modem registration process is bottlenecked by the mismatch between the rate at which cable modems transition to the DHCP state and the rate at which DHCP requests are processed by the CMTS and DHCP servers, leading to delays and unequal prioritization of modems, even though some modems require higher priority access.
Innovation Solution
A flow controller is introduced to prioritize DHCP requests based on cable modem attributes, organizing them into priority groups and controlling the order in which they are sent to the DHCP server, using a prioritizer to parse requests and assign priorities, and a flow control logic to manage the queue sizes and processing rates dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If DHCP requests are processed in the order they are received by the CMTS, then the processing is simple and straightforward, but high-priority cable modems cannot be registered before low-priority modems, resulting in unfair resource allocation
Solution Approach 1:
The patent segments the single DHCP request processing queue into multiple priority-based queues (e.g., high priority, normal priority, low priority). Each queue handles modems of corresponding priority levels, allowing the system to differentiate and process DHCP requests based on modem priority attributes while maintaining organized, manageable processing streams for each segment.
Solution Approach 2:
The patent applies local quality by assigning different processing characteristics to different segments of the DHCP request flow. High-priority modems receive expedited processing through dedicated queue pathways, while low-priority modems follow standard processing routes. This allows different parts of the system to operate with different service qualities appropriate to their priority level.
2Speed
If the CMTS brings cable modems to the DHCP state at a high rate, then modem initialization is fast, but the DHCP server and CMTS become bottlenecked because they cannot process DHCP requests fast enough
Solution Approach 1:
The patent implements preliminary action by having the CMTS perform priority classification and queue assignment for DHCP requests before forwarding them to the DHCP server. This preliminary organization of requests by priority level allows the DHCP server to process requests in an optimized sequence, preventing bottlenecks while maintaining fast initialization rates for high-priority modems.
Solution Approach 2:
The patent applies dynamics by implementing a dynamic queue management system where the CMTS can adjust the rate at which it forwards DHCP requests from different priority queues to the DHCP server. This dynamic control allows the system to match the DHCP server's processing capacity with the modem initialization rate, preventing overload while maintaining high throughput for priority modems.
3Device complexity
If all cable modems are treated equally in the DHCP processing queue, then the system is simple to manage, but modems associated with high-priority entities (e.g., 911 service, high rate subscriber) cannot receive preferential treatment
Solution Approach 1:
The patent segments the DHCP request processing system into multiple priority queues, creating distinct processing pathways for different modem priority levels. This segmentation enables the system to recognize and differentiate between high-priority entities (such as 911 service or high-rate subscribers) and standard modems, allocating processing resources accordingly while maintaining manageable complexity through structured queue organization.
4Productivity
If the CMTS processes DHCP requests from all modems simultaneously, then resource utilization is maximized, but the registration process becomes bottlenecked and delays occur
Solution Approach 1:
The patent implements preliminary action by organizing DHCP requests into priority queues before processing. This preliminary sorting allows the system to process high-priority modem registrations first, reducing their waiting time and registration delays, while still maintaining high overall productivity by continuously processing requests from all queues in an optimized sequence rather than allowing simultaneous unmanaged processing.
Data Source
AI summary
In one embodiment, a flow control logic facilitates controlling modem prioritization and registration. The flow control logic controls an order in which stored DHCP requests are provided to a DHCP server. The DHCP requests may be stored in a plurality of groups in a data store. DHCP requests may be distinguishable based, at least in part, on priorities associated with cable modems from which DHCP requests are received. The priority may be determined by a value in the DHCP request. The flow control logic may control the rate and order at which stored DHCP requests are provided to the DHCP server.