Cable Modem Bandwidth Prediction Unit for Voice QoS
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Solution Overview
Problem
Cable modems face increased loading and limited bandwidth utilization due to the need to maintain fixed bandwidth for voice packet streams and decrypt encrypted voice packets, which complicates the determination of quality of service (QoS) and reduces the effective use of available bandwidth.
Innovation Solution
A cable modem with a bandwidth prediction unit (BPU) that establishes, reads, and updates bandwidth allocation based on packet types, determining QoS by monitoring traffic and adjusting bandwidth distribution dynamically, eliminating the need for complex decryption algorithms and improving bandwidth utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cable modem maintains fixed bandwidth occupancy for voice packet streams and uses complicated decryption algorithms, then QoS can be established for voice streams, but loading on the cable modem increases and bandwidth utilization rate decreases
Solution Approach 1:
The patent extracts the decryption function from the cable modem, allowing the modem to work directly with encrypted packets without decrypting them. This removes the computational burden of decryption while maintaining QoS capabilities through traffic monitoring and bandwidth management of encrypted streams
Solution Approach 2:
The patent establishes QoS parameters and bandwidth allocation in advance for voice packet streams before actual voice traffic arrives. By pre-configuring QoS policies and reserving bandwidth, the system ensures reliable QoS establishment without requiring real-time decryption or complex algorithmic processing during active transmission
2Reliability
If a cable modem maintains fixed bandwidth occupancy for voice packet streams, then QoS can be established for voice streams, but loading on the cable modem increases
Solution Approach 1:
The patent removes the decryption workload from the cable modem by enabling it to process encrypted packets directly. This extraction of the decryption function significantly reduces device complexity and loading while maintaining the ability to establish and manage QoS for voice streams through bandwidth monitoring and control mechanisms
Solution Approach 2:
The system creates a simplified processing path that works with encrypted packet copies or metadata rather than requiring full decryption. This allows the cable modem to maintain QoS through monitoring packet characteristics and bandwidth usage without the computational overhead of decryption algorithms
3Reliability
If a cable modem uses complicated decryption algorithms for encrypted voice packet streams, then QoS can be determined after decryption, but bandwidth utilization rate is limited
Solution Approach 1:
The patent extracts the decryption requirement entirely from the QoS determination process. The cable modem can determine QoS for encrypted voice packets by monitoring traffic patterns, packet sizes, and bandwidth consumption directly on the encrypted streams, eliminating the need to decrypt packets before QoS assessment and thereby improving bandwidth utilization
Data Source
AI summary
A cable modem for establishing quality of service (QoS) for a real-time transport protocol (RTP) voice stream. The cable modem receives different packet types from a network, and establishes a BPU for each packet type. After reading one BPU periodically, the cable modem determines whether the BPU has QoS. Accordingly, the cable modem distributes a fixed bandwidth to establish QoS.