Mobile Station Data Connection Backoff Mechanism
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently establishing and maintaining reliable data connections between mobile stations and wireless networks, particularly in managing repeated retries for Packet Data Protocol (PDP) Context failures, which can overload the network.
Innovation Solution
A method involving a backoff mechanism where the delay time between retries increases progressively until a fixed delay time is reached, with the process resetting to initial values when a new network is selected, allowing for quicker initial retries and maintaining a reliable 'always-on' connection without overburdening the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continual repeated retries for re-establishing the PDP Context are performed by the mobile station, then the data connection reliability is improved, but the wireless network is unduly overloaded
Solution Approach 1:
The patent implements a dynamic retry mechanism where the delay period between retry attempts is not fixed but varies based on network conditions and attempt number. The delay period increases with each unsuccessful retry attempt, creating an adaptive strategy that balances connection reliability with network resource conservation.
Solution Approach 2:
The patent changes the temporal parameter (delay period) between retry attempts based on the attempt number and network response. By modifying this time parameter dynamically, the system reduces the frequency of retry requests as attempts progress, thereby preventing network overload while maintaining the ability to re-establish failed connections.
2Loss of time
If the delay time between retries is reduced, then the perceived delay for end users is reduced, but the network is more heavily burdened
Solution Approach 1:
The patent uses a dynamic delay strategy where the delay period starts short (immediate retry) but increases with each unsuccessful attempt. This creates a progressive backoff mechanism that provides quick response for transient failures while reducing network burden for persistent failures.
Solution Approach 2:
The patent implements periodic retry attempts with varying intervals. Instead of continuous or fixed-interval retries, the system uses periodic action with increasing periods, creating a rhythm that balances user experience (quick initial retries) with network protection (longer intervals for subsequent attempts).
Data Source
AI summary
One illustrative method for use in efficiently establishing a data connection, such as a Packet Data Protocol (PDP) Context, between a mobile station and a wireless communication network includes the steps of causing at least one data connection request to be transmitted to the wireless network in attempt to establish a data connection between the mobile station and the wireless network; setting a delay timer to an initial value and running the delay timer; if the data connection has not been established in response to transmitting the at least one data connection request, causing at least one subsequent data connection request to be transmitted after expiration of the delay timer set to the initial value; setting the delay timer to a subsequent initial value which is greater than the initial value and running the delay timer; and if the data connection has not been established in response to transmitting the at least one subsequent data connection request, causing at least one other subsequent data connection request to be transmitted after expiration of the delay timer set to the subsequent initial value. This technique continues until the data connection is established with the wireless network, if at all. If a new wireless network is selected during the technique, the process is reset such that the first initial value is again utilized first for the delay timer. Preferably, the technique works in combination with relatively more quick retries implemented in lower radio layer(s) (i.e. the physical, data link, or network layer). Thus, each data connection request may be a plurality of data connection retries which are performed much closer together in time than other retry attempts.