Mobile Station Packet Service Capability Detection in Circuit-Switched Mode
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Solution Overview
Problem
Mobile stations connected in circuit-switched mode are not provided with an indication of packet service capabilities, leading to potential erroneous selection of packet communication services due to lack of information about the available services in the serving cell.
Innovation Solution
A message generator at the base transceiver station generates an SI 6 message with a single-bit field indicating whether the network entity supports high-speed packet services, which is sent to the mobile station, allowing it to detect and report the packet-switched communication capabilities, even when connected in a circuit-switched mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the mobile station operates in circuit-switched mode without receiving packet service capability information, then the signaling protocol remains simple and existing infrastructure is maintained, but the mobile station cannot accurately determine available packet services leading to erroneous service selection
Solution Approach 1:
The patent applies preliminary action by including packet service capability information in the SI6 message that is sent to the mobile station before it initiates any packet service communication. This allows the mobile station to have advance knowledge of available services (EDGE/EGPRS capabilities) while maintaining the existing circuit-switched connection, eliminating the need for complex additional signaling protocols while preventing information loss.
2Loss of time
If the mobile station waits for Dual Transfer Mode session initiation to learn packet service capabilities, then the signaling protocol remains unchanged, but the mobile station experiences delay in obtaining accurate service capability information
Solution Approach 1:
The patent sends packet service capability information in the SI6 message during the circuit-switched connection establishment phase, before any Dual Transfer Mode session is initiated. This preliminary provision of information eliminates the waiting time for capability discovery while maintaining simple session management, as the mobile station already knows the available services when it needs to make communication decisions.
3Measurement precision
If the serving cell provides EDGE/EGPRS services, then high-speed packet communication is available, but the mobile station in circuit-switched mode cannot distinguish between GPRS and EDGE/EGPRS capability without additional signaling
Solution Approach 1:
The patent applies local quality by including specific capability indicators within the SI6 message that differentiate between GPRS-only and EDGE/EGPRS-capable cells. The message contains precise information about the serving cell's packet service capabilities, allowing the mobile station to accurately determine whether high-speed EDGE/EGPRS services are available at its current location, thereby preventing erroneous service selection.
Data Source
AI summary
An apparatus, and an associated methodology, for identifying to a circuit-switch-connected mobile station with an indication of packet-service capabilities available to a mobile station. A message generator at the network generates a message that includes an indication of the network-entity capabilities with respect to packet communications. A field of the message identifies the packet-service capabilities. A message is sent by the network and detected by a detector of the mobile station. A report is formed indicative of the value contained in the delivered message, and a user display displays an indication of the detected information.