CMTS Bandwidth Allocation for Delay-Sensitive Services
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Solution Overview
Problem
In telecommunications networks, the existing bandwidth allocation methods for cable modems (CMs) lead to significant upstream transmission delays due to insufficient resource allocation, which is request-dependent and inefficient, especially for delay-sensitive services.
Innovation Solution
The method involves a Cable Modem Termination System (CMTS) identifying service flow attributes of online CMs as delay-sensitive or delay-insensitive, allocating remaining bandwidth to delay-sensitive services, and informing CMs of their allocated bandwidth, thereby optimizing bandwidth usage and reducing delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If bandwidth allocation depends on request (contention-based or polling service), then resource allocation flexibility is improved, but upstream transmission delay increases
Solution Approach 1:
The CMTS proactively allocates remaining bandwidth to delay-sensitive service flows before the CM needs to send data, based on pre-configured bandwidth parameters. This eliminates the need for the CM to buffer data and send requests, thereby reducing upstream transmission delay while maintaining allocation flexibility through service flow-based differentiation.
2Stability of the object's composition
If fixed bandwidth is allocated to UGS service flow, then transmission stability is improved, but bandwidth utilization efficiency deteriorates
Solution Approach 1:
The total bandwidth is segmented into guaranteed bandwidth (for stable services like UGS) and remaining bandwidth (for dynamic allocation to delay-sensitive services). This segmentation allows stable services to maintain fixed allocations while enabling efficient dynamic allocation of leftover resources, improving overall bandwidth utilization without compromising transmission stability.
Solution Approach 2:
The system dynamically allocates the remaining bandwidth to delay-sensitive service flows based on their needs and service flow attributes. This dynamic allocation ensures that while guaranteed bandwidth maintains stability for UGS services, the remaining bandwidth is efficiently utilized for services requiring lower latency, thereby improving overall bandwidth utilization efficiency.
3Measurement precision
If CM buffers data in request phase, then bandwidth request accuracy is improved, but transmission delay increases
Solution Approach 1:
The CMTS performs preliminary bandwidth allocation for delay-sensitive service flows based on pre-configured parameters and service flow attributes, before the CM needs to send data. This proactive allocation eliminates the need for the CM to buffer data and send bandwidth requests, thereby reducing transmission delay while maintaining accurate bandwidth allocation through pre-planning.
Data Source
AI summary
An upstream bandwidth allocation method, apparatus, and system. The method includes obtaining, by a cable modem termination system (CMTS), a service flow attribute of each online cable modem (CM) of one or more online CMs, where the service flow attribute comprises at least one delay-sensitive service and a delay-insensitive service, allocating, by the CMTS, an upstream bandwidth to each online CM according to a received service request, and obtaining a remaining bandwidth that is a remaining part in a preset total bandwidth other than the upstream bandwidth that is allocated to each online CM according to the service request, allocating, by the CMTS, at least a part of the remaining bandwidth to a CM whose service flow attribute is a delay-sensitive service, and informing, by the CMTS, each online CM of the one or more online CMs of an upstream bandwidth allocation result.