CS Fallback Channel Selection via Paging Analysis
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Solution Overview
Problem
The existing CS fallback process in wireless telecommunications systems often results in delays and inefficient resource allocation due to the lack of optimal radio resource management, particularly when transitioning from a network that only provides packet-switched services to one that offers circuit-switched services, leading to sub-optimal channel allocation and resource waste.
Innovation Solution
A method and system that enable a wireless device to analyze paging messages for service-related information, determine the appropriate channel type, and request optimal radio resources during the CS fallback process, ensuring efficient allocation and minimizing delays by identifying suitable channel types for the requested service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UA implements CS fallback from a packet-switched network to a circuit-switched network, then voice calls and CS domain services can be accessed, but delays occur and radio resources are allocated inefficiently
Solution Approach 1:
The UA performs preliminary actions by analyzing the paging message to determine the service type and requesting the appropriate channel type before actually establishing the CS domain connection. This preliminary determination of service type (voice call, data call, SMS, etc.) and corresponding channel type (TCH, DCH, RACH, etc.) allows the network to pre-allocate appropriate radio resources, avoiding delays during the actual connection establishment phase.
Solution Approach 2:
The system implements feedback by using information from the paging message (service type indicators) to influence the channel request. The UA provides feedback to the network about the required service type, and the network uses this feedback to allocate appropriate radio resources. This closed-loop approach ensures that the radio resources allocated match the actual service requirements, improving both reliability and reducing delays.
2Device complexity
If a UA requests radio resources without determining the appropriate channel type, then the CS fallback process is simpler, but radio resources are allocated sub-optimally leading to resource waste
Solution Approach 1:
The UA performs self-service by autonomously analyzing the paging message to determine the service type and selecting the appropriate channel type for its resource request. Rather than relying on the network to allocate resources without specific guidance, the UA independently determines what resources it needs based on the service type indicators in the paging message. This self-determination ensures optimal resource allocation without adding significant complexity to the overall process.
Solution Approach 2:
The invention changes the parameter being requested in the channel request message from a generic channel request to a specific channel type request based on service type. By changing the parameter (channel type) in the resource request based on the service type determined from the paging message, the system ensures that the appropriate radio resources are allocated without requiring complex network-side determination logic.
Data Source
AI summary
A system and method for implementing fallback on a wireless device for circuit switched fallback from a first network that does not provide a circuit switched domain service is presented. A paging message is received from the first network. The paging message instructs the wireless device to implement circuit switched fallback to a circuit switched network. The paging message is inspected for information indicative of a service associated with the paging message, and a channel type suitable for the service is determined from the information indicative of the service. A request message for initiating the establishment of a radio connection is transmitted. The request message identifies the suitable channel type, and the service is used on the circuit switched network.