UMA Bitrate Signaling Multiplication Factor
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Solution Overview
Problem
Current UMA/3GPP specifications cannot signal bitrates exceeding 43.5 kbit/s over the UMAN/GAN radio interface, limiting the support of high bit rate services such as videotelephony, as they reuse the GSM Channel Mode Information Element without accounting for the different radio interface organization.
Innovation Solution
Introducing a multiplication factor parameter in the Activate Channel URR/GA-CSR message and adding new parameters to describe multislot configurations, allowing bitrates higher than the GSM maximum by multiplying or adding bitrates within the Channel Mode and Mode of Channel Set Information Elements, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the GSM Channel Mode Information Element is reused in UMA/3GPP specifications, then compatibility with existing GSM infrastructure is maintained, but the maximum bit rate is limited to 43.5 kbit/s which cannot support high bit rate services like videotelephony
Solution Approach 1:
The invention changes the parameter representation by introducing a multiplication factor that scales the base bit rates defined in the Channel Mode Information Element. Instead of directly specifying absolute bit rates, the system uses a base rate from the information element and multiplies it by a factor to achieve higher effective bit rates, thereby supporting videotelephony and other high bit rate services while maintaining compatibility with existing GSM infrastructure
Solution Approach 2:
The invention adds a new dimension to the bit rate specification by introducing the multiplication factor parameter. This creates a two-dimensional bit rate definition system where the actual bit rate is determined by the combination of the base rate from the Channel Mode Information Element and the multiplication factor, enabling extended bit rate ranges without modifying the original GSM specification structure
2Quantity of substance
If new parameters are added to describe multislot configurations, then higher bit rates can be achieved, but the complexity of the signalling protocol increases
Solution Approach 1:
The invention makes the existing Channel Mode Information Element and Mode of Channel Set Information Elements multi-functional by introducing a multiplication factor that can be applied to these existing structures. This allows the same information elements to serve both traditional GSM services and new high bit rate services, avoiding the need for entirely new signalling structures and reducing overall protocol complexity
Solution Approach 2:
The invention segments the bit rate specification into two parts: the base bit rate defined in existing information elements and the multiplication factor. This segmentation allows the system to leverage existing standardized bit rate definitions while adding flexibility through the multiplier, thereby achieving higher bit rates without completely redesigning the signalling protocol
Data Source
AI summary
One object of the present invention is a method for the support of high bit rate services in a mobile communication system, said method comprising a step wherein a network entity signals to a Mobile Station, according to signalling procedures used in case of access via a broadband Access Network, at least one bit rate higher than the maximum bit rate specified in case of access via a non broadband Access Network, based on bit rates as defined according to signalling procedures used in case of access via said non broadband Access Network.