Wireless Base Station Rate Matching via DOCSIS Feedback
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Solution Overview
Problem
There is a mismatch in data rate between wireless nodes and their wireline backhaul in DOCSIS networks, leading to buffer overflow and packet loss due to differences in modulation orders between the wireless base stations and the DOCSIS backhaul systems.
Innovation Solution
The proposed solution involves enhancing coordination between wireless base stations and their wireline backhaul by identifying the type of equipment connected to the backhaul, establishing service flows, and transmitting data configured to enable rate-matching and configuration optimization processes. This includes using DOCSIS 3.1 and 4.0 technologies to support higher modulation orders and utilizing spatial multiplexing and beamforming techniques to improve throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher modulation orders are used in DOCSIS backhaul to increase data rate, then backhaul throughput is improved, but mismatch with wireless node capabilities causes buffer overflow and packet loss
Solution Approach 1:
The patent implements a feedback mechanism where the wireless base station monitors its buffer status and communicates this information to the DOCSIS backhaul system. The base station sends buffer status reports indicating when buffers are approaching capacity, allowing the backhaul to dynamically adjust its data rate to prevent overflow and packet loss while maximizing throughput when buffer capacity is available.
Solution Approach 2:
The system dynamically adjusts the backhaul data rate based on real-time buffer status rather than using a fixed high-rate configuration. The DOCSIS backhaul modulates its transmission rate according to the wireless node's buffer capacity, enabling the system to operate at high throughput when possible while preventing buffer overflow conditions that cause packet loss.
2Reliability
If data rate mismatch is resolved by reducing wireless node transmission rate, then packet loss is reduced, but overall network capacity is underutilized
Solution Approach 1:
Rather than statically reducing the wireless node transmission rate, the system dynamically adjusts the backhaul data rate to match buffer capacity. This allows the wireless node to maintain its capability for high-rate transmission while the backhaul adapts its rate in real-time, preventing packet loss without permanently underutilizing network capacity.
Solution Approach 2:
The system changes the backhaul data rate parameter dynamically based on buffer status conditions. When buffers have available capacity, the backhaul operates at higher data rates to maximize throughput. When buffers are near capacity, the backhaul reduces its data rate to prevent overflow, thereby maintaining both reliability and capacity utilization across different operating conditions.
3Manufacturing precision
If coordination mechanisms are added between wireless base stations and backhaul, then rate matching is improved, but system complexity increases
Solution Approach 1:
The coordination mechanism uses a relatively simple feedback loop where the base station monitors its buffer status and sends status reports to the backhaul system. The backhaul then adjusts its data rate based on this feedback. This feedback-based approach achieves precise rate matching without requiring complex coordination protocols, maintaining manageable system complexity while improving rate matching precision.
Data Source
AI summary
Methods and apparatus for enhancing communication and performance for a device backhauled by a wireline communication network. In one embodiment, the device comprises a small-cell or other wireless base station that is backhauled by a DOCSIS system within a managed HFC network, and the method and apparatus enable enhanced communication between the small cell/base station and the backhaul network so as to support “rate matching” between the device to mitigate packet overflow or other issues. In one implementation, enhanced cable modem (CM) and base station devices coordinate to inform the base station of the modulation order (and/or other parameters related to transmission of the data destined for the base station on the backhaul) so that the base station can selectively invoke utilization of higher-order modulation and/or coding schemes, as well as spatial multiplexing or beamforming.