CDMA2000 Service Option Switching to Circuit Data
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Solution Overview
Problem
Current CDMA2000 networks lack a straightforward method for users to switch between voice and circuit data during calls, making it complex and error-prone to use wireless fax services, as existing technologies do not allow for seamless conversion between voice and data services.
Innovation Solution
A method that involves the mobile station notifying the base station to switch to circuit data, with subsequent negotiations between the base station and mobile switching subsystem to determine bearer format parameters, followed by user interface traffic layer encapsulation and transmission of Real-Time Transport Protocol packets, allowing for seamless switching between voice and circuit data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If operation codes are added ahead of fax number and fixed station is set in receiving fax mode, then wireless fax service can be realized, but the operation process becomes very complex and error-prone
Solution Approach 1:
The system automatically detects and switches between voice and circuit data modes based on the received operation codes, eliminating the need for manual mode switching by users. The mobile station and fixed station autonomously negotiate and establish the appropriate service mode, making the system self-serve rather than requiring complex user operations.
Solution Approach 2:
Operation codes serve as intermediaries that automatically trigger mode switching between voice and fax services. Instead of requiring users to manually configure mode switching, the operation codes act as automated signals that the system interprets to seamlessly transition between service modes, simplifying user interaction.
2Adaptability or versatility
If manual mode switching is required between voice and fax, then service flexibility is maintained, but user operation becomes complex requiring fixed station configuration
Solution Approach 1:
The system performs automatic mode switching and configuration based on operation codes received during the call. Both mobile and fixed stations autonomously negotiate service modes without requiring manual user configuration, eliminating the complexity of fixed station setup while maintaining service flexibility.
Solution Approach 2:
The system pre-configures multiple service modes (voice, fax, data) and uses operation codes to trigger transitions between them. This preliminary preparation of service modes allows the system to quickly switch between functions without requiring complex real-time configuration or user intervention.
3Ease of operation
If seamless switching between voice and circuit data is enabled, then user experience is improved, but negotiation protocols between BSS and MSS become more complex
Solution Approach 1:
The negotiation protocol is designed to handle multiple service types (voice, fax, data) through a unified framework. The same negotiation mechanism between BSS and MSS can switch between different service modes using standardized operation codes, rather than requiring separate protocols for each service type, thus managing complexity while providing universal service support.
Solution Approach 2:
The system switches between voice and circuit data modes by changing parameters in the bearer format negotiation. Instead of fundamentally different protocols, the same negotiation framework adjusts service parameters (such as data type, coding format) to enable seamless transitions between service modes, simplifying the overall system architecture.
Data Source
AI summary
This invention discloses a method for switching SO (Service Option) to circuit data, including the following steps: step 1, a mobile station notifies a source BS (Base Station) and/or a target BS to switch SO to circuit data during a session; step 2, the source BS and/or the target BS negotiates with a mobile switching subsystem about switching SO to circuit data, and determines the bearer format parameters of the session through the negotiation; step 3, the source BS and/or the target BS makes a secondary service negotiation with the mobile station after the negotiation with the mobile switching subsystem succeeds; and step 4, after the negotiation with the mobile station succeeds, the source BS and/or the target BS conducts user interface service layer encapsulation on the circuit data according to a certain load format, and then transmits the encapsulated Real Time Transfer Protocol packets to the other BS.