UMTS Fast Call Setup via RRC Message Encapsulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current UMTS systems experience long call setup delays, which negatively impact Quality Of Service for services sensitive to such delays, such as interactive games and Push to talk Over Cellular services, due to the numerous signaling/data connection procedures involved in the call setup process.
Innovation Solution
The method involves encapsulating a Service Request in a RRC Connection Request message, allowing for early transmission of NAS Service Requests to the CN, simplifying NAS signaling by omitting authentication and security procedures, and combining RRC and RB setup processes, with pre-configured channel parameters to reduce delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional call setup procedures are followed in UMTS systems, then signaling connections are properly established with authentication and security, but call setup delays become too long for delay-sensitive services
Solution Approach 1:
The patent applies preliminary action by pre-configuring channel parameters and preparing signaling connections before actual service activation. The RNC pre-establishes radio bearers and configures channel parameters in advance, so that when a delay-sensitive service arrives, the signaling connection is already prepared and authentication can be skipped, significantly reducing call setup delay while maintaining reliability for non-delay-sensitive services
Solution Approach 2:
The patent segments the call setup process into two paths: a fast path for delay-sensitive services that skips authentication and security procedures, and a traditional path for other services that maintains full security checks. This segmentation allows the system to provide differentiated service quality, ensuring reliability where needed while minimizing delay where possible
2Reliability
If multiple signaling procedures are executed for call setup, then connection reliability is ensured, but the number of steps increases call setup delay
Solution Approach 1:
The patent applies partial action by executing only the necessary signaling procedures for delay-sensitive services. Instead of performing all standard signaling steps (authentication, security mode setting, ciphering), the system performs only the essential radio bearer establishment and channel configuration, achieving sufficient connection reliability for real-time services while significantly improving call setup speed
3Reliability
If full NAS signaling procedures are performed, then security and authentication are ensured, but call setup time increases
Solution Approach 1:
The patent extracts and removes the authentication and security procedures from the fast call setup path for delay-sensitive services. By taking out these time-consuming NAS signaling steps and placing them only in the traditional path, the system achieves rapid call setup for real-time services while maintaining security for non-time-critical connections
Data Source
AI summary
A method of UU message transfer for fast call setup is disclosed. The method includes encapsulating a Service Request into a RRC Connection Request message. When a UE starts the service sensitive to call setup delays, the RRC Connection Request undergoes non-critical extension. The Service Request and necessary Access Stratum (AS) information are disposed into the extended portion. The RNC, after receiving the extended RRC connection request, extracts the IDT message from the extended RRC Connection Request and sends it to the CN.