Idle Mode UE SIP Data Transmission via Combined Control Messages
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Solution Overview
Problem
The existing 3GPP mobile communication system experiences transmission delays due to the need for idle mode UE to transition from idle to connected mode for SIP data transmission, resulting in increased end-to-end delays for IMS services.
Innovation Solution
A method and apparatus for transmitting SIP data by an idle mode UE, where SIP data is combined with AS and NAS control messages to form a single LTE connection request message, allowing for efficient transmission and reducing the need for multiple connection setup procedures, utilizing an Evolved Radio Access Network (E-RAN) and Evolved Core Network (E-CN) to establish a Radio Access Bearer (RAB) for SIP data exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If idle mode UE transitions to connected mode for SIP data transmission, then reliable data transmission is achieved, but transmission delay increases
Solution Approach 1:
The patent combines multiple control messages (RRC connection request, service request, and SIP data) into a single uplink message transmission. This merging eliminates the need for separate message exchanges, reducing the number of round-trip delays while maintaining reliable delivery through proper protocol layer handling of the combined message contents
Solution Approach 2:
The patent enables SIP data to be prepared and included in the connection request message before the formal connected mode is fully established. This preliminary action allows data transmission to begin during the connection setup phase, rather than waiting for complete mode transition, thereby reducing overall transmission delay
2Reliability
If multiple connection setup procedures are performed for SIP data transmission, then proper network registration and connection establishment are achieved, but procedure complexity increases
Solution Approach 1:
The patent merges multiple connection setup procedures (RRC connection establishment, service request, and SIP data transmission) into a single integrated message exchange. This reduces procedure complexity by eliminating redundant steps while maintaining the essential functions of network registration and connection establishment through the combined message structure
3Loss of time
If idle mode UE transmits SIP data directly without connection setup, then transmission delay is reduced, but data transmission reliability deteriorates
Solution Approach 1:
The patent performs preliminary actions by including SIP data in the connection request message itself, allowing data transmission to occur during the connection setup phase. This approach reduces delay by not waiting for separate data channels while maintaining reliability through the established protocol framework that handles the combined message appropriately
Data Source
AI summary
A method and apparatus are provided for transmitting a Session Initiation Protocol (SIP) message by a User Equipment (UE) in an idle mode in an Internet Protocol Multimedia Subsystem (IMS) system. The UE transmits one combined message of an AS control message and a NAS control message including information indicating transmission of an SIP message, thereby having an effect on an upper node to reduce a delay due to message processing.