Mobile Unit Protocol Switch for Packet Data Call Reliability
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Solution Overview
Problem
Mobile units often abort packet data calls due to failures in the data link layer of the EVDO network, even though the physical layer remains operational, leading to unsuccessful IP registrations and call drops.
Innovation Solution
A method and system that allow a mobile unit to detect failures in IP registrations using the EVDO protocol and switch to the 1X protocol for retrying packet data calls, ensuring communication continuity by utilizing the unaffected physical layer of EVDO for data link layer failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the mobile unit attempts IP registration using the EVDO protocol, then higher transmission speed is achieved, but call reliability deteriorates when data link layer failures occur
Solution Approach 1:
The system dynamically changes the protocol parameter based on the operational state of network layers. When the EVDO data link layer is functional, the system uses EVDO for high-speed transmission. When data link layer failures are detected, the system switches to the 1X protocol, thereby adapting the transmission parameter to maintain call reliability while preserving the ability to achieve high speeds when conditions permit.
Solution Approach 2:
The patent implements a dynamic protocol selection mechanism that monitors the state of the EVDO data link layer and automatically switches between EVDO and 1X protocols. This dynamic adaptation allows the system to optimize for speed when EVDO is operational while ensuring reliability by falling back to 1X when data link layer issues occur, resolving the contradiction between speed and reliability.
2Ease of operation
If the mobile unit continues attempting MIP/SIP registrations on EVDO after data link layer failure, then ease of operation is maintained, but loss of time increases due to repeated failed attempts
Solution Approach 1:
The system implements a feedback mechanism that monitors registration outcomes and detects patterns of failure. When multiple MIP/SIP registration attempts fail on the EVDO network, the system uses this feedback to trigger a protocol switch to 1X. This feedback-driven approach maintains ease of operation by automating the switch while significantly reducing the time lost to repeated failed registration attempts.
Solution Approach 2:
The patent establishes predetermined thresholds for registration failures and prepares the protocol switch mechanism in advance. When the number of failed MIP/SIP attempts reaches the predetermined threshold, the system automatically switches to 1X protocol without requiring additional user input or extended waiting periods. This preliminary preparation of the fallback mechanism reduces registration time while maintaining automatic operation.
3Reliability
If the mobile unit switches to 1X protocol when EVDO data link layer fails, then call reliability is improved, but transmission speed decreases
Solution Approach 1:
The system dynamically changes the protocol parameter based on network conditions. When EVDO data link layer failures are detected, the system switches to the 1X protocol to ensure call reliability. When EVDO operations succeed, the system returns to using EVDO for higher transmission speeds. This parameter adaptation resolves the contradiction by allowing the system to optimize for reliability when needed and for speed when conditions permit.
Solution Approach 2:
The patent implements a dynamic protocol selection mechanism that monitors EVDO data link layer functionality and automatically switches between EVDO and 1X protocols. This dynamic approach allows the system to maintain high transmission speeds using EVDO when operational while ensuring call reliability by switching to 1X when data link layer issues occur, thereby resolving the speed-reliability contradiction.
Data Source
AI summary
A method and system for retry of a packet data call. The method can include the steps of attempting (210) an IP registration with a mobile unit (110) to make a packet data call using a first protocol on a network (120) that employs both the first protocol and a second protocol for packet data calls and detecting (212) a failure in the IP registration using the first protocol due to a failure in a data link layer of the first protocol. A physical layer of the first protocol is unaffected by the failure in the data link layer of the first protocol such that communications may still be performed over the physical layer. The method can also include the steps of—at the mobile unit—ceasing (214) the attempted IP registration using the first protocol on the network and attempting (216) an IP registration with the mobile unit using the second protocol of the network. As an example, the first protocol can be EVDO, and the second protocol can be 1X.