Media Gateway Bearer Control for TDM-IP Interworking
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Solution Overview
Problem
The existing bearer control processing methods in communication networks, particularly in scenarios where calls are routed from a TDM bearer network to an IP bearer network and back, result in redundant RTP packing, unpacking, and transcoding, leading to increased processing burden and latency, negatively affecting service quality.
Innovation Solution
A method that determines whether the media stream is exchanged within the same physical media gateway, and if so, performs media negotiation to select a common codec type and directly connects TDM circuit ports, thereby avoiding unnecessary transcoding and packing/unpacking processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the existing bearer control processing method is used for routing calls from TDM bearer network to IP bearer network and back, then the call can be routed through the IP network domain, but redundant RTP packing, unpacking, and transcoding operations occur, increasing processing burden and latency
Solution Approach 1:
The patent applies preliminary action by determining whether the source and destination media gateways are the same physical entity before establishing the call path. The control entity performs this determination in advance during the call setup phase, allowing it to pre-configure the optimal routing path that avoids unnecessary RTP packing/unpacking operations. This preliminary identification enables the system to skip redundant processing steps from the outset, reducing overall processing latency while maintaining full adaptability for calls that do require gateway traversal.
2Adaptability or versatility
If the existing bearer control processing method is used for routing calls from TDM bearer network to IP bearer network and back, then the call can be routed through the IP network domain, but redundant transcoding operations occur, increasing processing burden
Solution Approach 1:
The patent applies preliminary action by determining whether the source and destination media gateways are the same physical entity before establishing the call path. The control entity performs this determination in advance during the call setup phase, allowing it to pre-configure the optimal routing path that avoids unnecessary transcoding operations. This preliminary identification enables the system to skip redundant processing steps from the outset, reducing overall processing latency while maintaining full adaptability for calls that do require gateway traversal.
Solution Approach 2:
The patent extracts and removes the redundant RTP packing, unpacking, and transcoding operations from the call processing path. By identifying that the source and destination media gateways are the same physical entity, the system extracts these unnecessary intermediate processing steps from the signal flow, leaving only the essential call routing and media transmission functions. This extraction simplifies the processing chain while preserving the network's ability to handle calls that do require full interworking operations.
3Adaptability or versatility
If redundant RTP packing and unpacking operations are performed, then the call can be routed through IP bearer network, but network resource utilization decreases due to unnecessary processing
Solution Approach 1:
The patent applies preliminary action by determining whether the source and destination media gateways are the same physical entity before establishing the call path. The control entity performs this determination in advance during the call setup phase, allowing it to pre-configure the optimal routing path that avoids unnecessary RTP packing/unpacking operations. This preliminary identification enables the system to skip redundant processing steps from the outset, reducing overall processing latency while maintaining full adaptability for calls that do require gateway traversal.
Solution Approach 2:
The patent extracts and removes the redundant RTP packing, unpacking, and transcoding operations from the call processing path. By identifying that the source and destination media gateways are the same physical entity, the system extracts these unnecessary intermediate processing steps from the signal flow, leaving only the essential call routing and media transmission functions. This extraction simplifies the processing chain while preserving the network's ability to handle calls that do require full interworking operations.
Data Source
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AI summary
A method for bearer control includes: a first control entity routes a call which is routed from a TDM bearer based network domain or originated by an intra-office POTS subscriber, into an IP bearer based network domain; a second control entity receives the call which is routed back from said IP bearer based network domain and is destined to the TDM bearer based network domain or the intra-office POTS subscriber; when it's determined that a media stream that enters into and exits from said IP bearer based network domain is exchanged on the same media gateway, the first and the second control entities perform a media negotiation during the SIP session to select a same media codec type as the one used on TDM circuits or subscriber lines at two sides, and control a corresponding media gateway to transmit the media stream according to said selected media codec type.