UMTS-GSM Load Distribution via Early Service Type Detection
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Solution Overview
Problem
Current mobile radio network systems cannot unambiguously determine the type of service requested (voice or video) until a late phase of connection establishment, limiting early resource allocation and efficient load distribution between UMTS and GSM networks.
Innovation Solution
Expanding the establishment causes in the UMTS mobile radio system to include additional information elements in the RRC CONNECTION REQUEST message, allowing the RNC to differentiate between voice and video calls early on, enabling resource reservation and service-based handovers to GSM networks before core network signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dual-mode mobile telephones preferentially camp on the UMTS network, then expanded functionalities such as multimedia connections and higher packet data rates are provided, but simple voice connections occupy UMTS resources unnecessarily and cause idling of GSM networks
Solution Approach 1:
The patent applies preliminary action by modifying the RRC CONNECTION REQUEST message to include establishment cause information that enables the RNC to determine the service type before connection establishment. This allows the network to pre-decide whether to accept voice connections on UMTS or redirect to GSM, preventing unnecessary UMTS resource occupation before it occurs. The key is obtaining service type information (voice vs. video) in the earliest possible phase through extended signaling elements.
Solution Approach 2:
The patent uses an intermediary approach by introducing extended establishment cause information elements as mediators between the mobile telephone and the network decision-making process. These additional signaling elements carry service type information that enables intelligent routing decisions. The intermediary information allows the RNC to act as a smart mediator that directs voice traffic to GSM and video traffic to UMTS based on the extracted service type, rather than all traffic going to UMTS by default.
2Productivity
If service-based handover or directed retry is used to redirect voice connections from UMTS to GSM, then unused GSM resources can be utilized, but the decision can only be made in a very late phase of connection establishment
Solution Approach 1:
The patent resolves this contradiction by applying preliminary action - obtaining service type information through extended establishment cause elements in the RRC CONNECTION REQUEST message before connection establishment begins. This allows the RNC to make the handover decision at the earliest possible moment, rather than waiting for late-phase signaling. The service type is determined preliminarily, enabling immediate redirection to GSM for voice connections without delaying the overall connection process.
3Loss of time
If establishment causes are expanded to include additional information elements in the RRC CONNECTION REQUEST message, then the RNC can differentiate between voice and video calls early on, but the signaling complexity increases
Solution Approach 1:
The patent applies universality by extending the existing establishment cause information element to serve multiple functions. Rather than creating entirely separate signaling messages, the established RRC CONNECTION REQUEST framework is enhanced to carry both traditional connection information and new service type indicators. This multi-functional approach allows the same signaling structure to handle both legacy and enhanced services, minimizing the increase in complexity while maximizing the benefit of early service type detection.
Data Source
AI summary
A method for optimizing the load distribution between one mobile radio network, for example using the UMTS standard, and another mobile radio network, for example using the GSM standard, by optimizing the signalling sequence when establishing a connection in such a mobile radio system. It enables efficient cooperation when establishing a connection, for example a voice connection, between a UMTS and a GSM network. In addition to the efficient use of resources in a UMTS system, the method also enables direct establishment of a connection, for example of a voice connection that was initiated in a UMTS network, in a GSM network.