SID Format Conversion for Tandem-Free Voice Operation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The incompatibility of silence insertion descriptor (SID) frames between 2G and 3G wireless networks prevents tandem-free operation, leading to unnecessary transcoding and signal distortion in voice calls across mixed-generation wireless networks.
Innovation Solution
A method and system for SID conversion that identifies incompatible SID formats between nodes and converts SID frames from one format to another, enabling tandem-free operation by determining the codecs used by each node and adapting the SID frames accordingly, allowing voice data to be sent without transcoding into an intermediate format.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If voice compression is used to reduce bandwidth consumption, then bandwidth efficiency is improved, but signal distortion is introduced through transcoding operations
Solution Approach 1:
The patent introduces a media gateway as an intermediary component that performs SID format conversion between 2G and 3G networks. This mediator enables tandem-free operation by translating SID frames from one codec format to another, allowing voice data to bypass intermediate transcoding operations that would otherwise degrade quality. The media gateway converts SID parameters (such as LSF and energy gain) from the source codec format to the destination codec format, enabling direct voice transmission without quality loss.
2Adaptability or versatility
If intermediate transcoding is performed to ensure compatibility between 2G and 3G networks, then interoperability is improved, but voice quality deteriorates due to signal distortion
Solution Approach 1:
The patent segments the voice transmission path into two distinct functions: SID frame conversion performed by the media gateway, and voice data transmission performed directly between base station subsystems. By separating the compatibility handling (SID conversion) from the voice data path, the system achieves both interoperability and high voice quality. The SID frames are converted to ensure codec compatibility, while the actual voice data flows without intermediate transcoding.
Solution Approach 2:
The media gateway acts as a mediator that handles format conversion for SID frames without requiring intermediate transcoding of the voice data itself. It converts SID parameters between different codec formats (e.g., from AMR to EFR) to enable compatibility between 2G and 3G networks, while allowing the voice data to be transmitted directly in its compressed form, thus maintaining quality.
3Adaptability or versatility
If multiple transcoding steps are performed in mobile-to-mobile calls, then format compatibility is improved, but the number of signal distortion events increases
Solution Approach 1:
The media gateway serves as a single intermediary that performs all necessary SID format conversions in one location, eliminating the need for multiple distributed transcoding steps. By centralizing the format adaptation function, the system reduces the number of times voice data undergoes compression/expansion cycles, thereby minimizing cumulative signal distortion while maintaining codec compatibility across 2G and 3G networks.
Data Source
Figure 1~3
Figure 4
Figure 5
AI summary
Methods, systems, and computer program products for silence insertion descriptor (SID) conversion are disclosed. According to one aspect, the subject matter described herein includes a method for silence insertion descriptor (SID) conversion. The method includes receiving a wireless frame, the frame identifying a first node as a frame source and a second node as a frame destination; determining whether tandem-free operation (TFO) is applicable; responsive to a determination that TFO is applicable, determining whether the frame is a SID frame; responsive to a determination that the frame is a SID frame, determining whether the SID format used by the first node is incompatible with the SID format used by the second node; and responsive to a determination that the SID format used by the first node is incompatible with the SID format used by the second node, converting the SID frame from the SID format used by the first node to the SID format used by the second node.