TDM Traffic Encapsulation for Cellular Backhaul
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Solution Overview
Problem
Existing methods for delivering TDM and data services over access networks often result in performance differences when emulating TDM services, leading to unsatisfactory results, especially in cellular backhaul networks, and lack efficient mechanisms for managing TDM traffic across multiple lines.
Innovation Solution
The use of 64/65-octet encapsulation standard to encapsulate TDM traffic, allowing dynamic adjustment and differentiation of TDM and STATMUX traffic on a single line, enabling efficient multiplexing and distribution of TDM traffic across multiple lines with asynchronous bandwidth management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If TDM services are delivered over a data network using overlay networks, then both data and TDM services can be delivered simultaneously, but the TDM service has significantly different jitter and synchronization characteristics than traditional TDM services
Solution Approach 1:
The patent segments the data network into virtual TDM channels that emulate traditional TDM characteristics. By dividing the packet-switched network into simulated circuit-switched paths, the system maintains TDM synchronization and jitter properties while operating over a data network infrastructure.
Solution Approach 2:
The patent introduces intermediary functions at network edges that translate between packet-switched and circuit-switched domains. These edge devices act as mediators that preserve TDM timing and synchronization characteristics while allowing transport over packet networks, thus maintaining traditional TDM service quality.
2Manufacturing precision
If one TDM service per line is used, then the access line runs at the exact rate required for that TDM service, but multiple TDM streams cannot be efficiently multiplexed across multiple lines
Solution Approach 1:
The patent merges multiple TDM streams from different lines into a single multiplexed stream. By combining the capacity of multiple access lines and efficiently interleaving TDM frames, the system can carry multiple TDM services simultaneously while maintaining the exact rate requirements of each individual service.
Solution Approach 2:
The patent creates a universal access line interface that can handle multiple TDM streams with different rates. The system provides multi-functionality by allowing a single access line to carry various TDM services (E1, E3, T1, etc.) and enabling dynamic allocation of line capacity to different TDM streams based on demand.
3Productivity
If TDM traffic is distributed across multiple lines, then bandwidth utilization improves, but asynchronous distribution and reassembly become complex
Solution Approach 1:
The patent applies preliminary actions by pre-synchronizing and pre-labeling TDM frames at the point of distribution. Each frame is marked with sequence information and line identification before being distributed asynchronously across multiple lines, which simplifies the reassembly process at the receiving end by providing all necessary ordering information in advance.
Data Source
AI summary
A communication network is operated by communicating Time Division Multiplexing (TDM) traffic and data (STATMUX) traffic over a single connection, where the single connection may include multiple aggregated lines using a traffic encapsulation standard configured to support STATMUX traffic.