TDM Logical Port Mapping for Packet Network Transport
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Solution Overview
Problem
Current methods for transporting Time Division Multiplexing (TDM) data over packet switching networks suffer from low effective bandwidth utilization due to excessive encapsulation headers, leading to decreased efficiency and increased processing load, especially in shared transmission media environments like wireless access networks.
Innovation Solution
The method involves setting up TDM logical ports on both transmitting and receiving sides, mapping TDM data to these ports, and encapsulating it with minimal necessary headers into MAC data packages, using a Connection Identifier (CID) for efficient transport, thereby reducing the need for multilayer encapsulation and supporting real-time protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multilayer encapsulation is performed on TDM data flow using existing network protocols, then the TDM data can be transported over packet switching networks with routing and switching capabilities, but the effective bandwidth utilization decreases due to excessive encapsulation headers
Solution Approach 1:
The patent extracts and removes unnecessary encapsulation layers (IP, TCP/UDP, RTP/RTCP headers) from the TDM data transport path, retaining only the essential MAC layer encapsulation. This extraction principle eliminates redundant header overhead while preserving the core functionality of TDM data transport over shared media.
Solution Approach 2:
Instead of following the conventional approach of encapsulating TDM data in multiple protocol layers (Ethernet/IP/TCP-UDP/RTP-RTCP), the patent inverts the approach by using a simplified MAC layer encapsulation method specifically designed for TDM data, thereby reducing header overhead from 66 bytes to minimal overhead.
2Ease of operation
If multilayer encapsulation with determined byte headers is used, then the TDM data can be processed through standard network protocols, but the data payload ratio in the whole data package becomes very low, decreasing transport efficiency
Solution Approach 1:
The patent extracts and eliminates redundant protocol processing layers (IP layer, transport layer, real-time protocol layer) from the TDM data path, keeping only the necessary MAC layer processing. This reduces the number of header additions and table look-up operations, thereby improving transport efficiency.
Solution Approach 2:
The patent applies different processing qualities to different data types: TDM data receives simplified MAC layer encapsulation with minimal overhead, while other packet data continues to use standard multilayer encapsulation. This localized optimization ensures efficient TDM transport without compromising general network protocol compatibility.
3Adaptability or versatility
If gateway devices and processing modules are added to perform table look-up and header adaptation operations, then the TDM data can be properly encapsulated and routed, but the processing load of devices increases
Solution Approach 1:
The patent extracts and removes the need for complex gateway devices and multiple processing modules by eliminating redundant protocol layers. The simplified MAC layer encapsulation approach removes the requirement for IP header adaptation, TCP/UDP header processing, and RTP/RTCP header management, thereby reducing device complexity.
Solution Approach 2:
The patent creates a universal MAC layer encapsulation method that handles TDM data transport directly without requiring multiple specialized processing modules for different protocol layers. This multi-functional approach consolidates the processing requirements into a single, simplified framework.
Data Source
AI summary
A method for TDM data transport is disclosed. Configure a TDM logical port in the transmitting and receiving side respectively, and create a relationship between the TDM logical port of the transmitting side and that of the receiving side. When transmitting the TDM data, map original TDM data to a package data format via the TDM logical port. Encapsulate the acquired package data and a CID into a MAC data package according to the predetermined encapsulation information. Then send the data package to the receiving side via a shared transmission channel. The receiving side MAC layer obtains the de-encapsulation information and the receiving side TDM logical port identifier according to the CID of the received data package, de-encapsulates the data package, maps the acquired data to the corresponding receiving side TDM logical port to implement high efficiency TDM data transport.