Dual Protocol Stack Handover Using Conditional Stack Deactivation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing multiple active protocol stacks, leading to increased latency and reduced success probability in handover processes, particularly in 4G and 5G networks.
Innovation Solution
The implementation of a method and apparatus that allows for the simultaneous activation of multiple protocol stacks, including a first and second protocol stack, with the deactivation of the first stack upon receiving a response from the second, to establish connections with multiple cells, thereby reducing latency and enhancing handover success.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple protocol stacks are activated simultaneously, then handover success probability is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by activating the second protocol stack before the first protocol stack is fully established. The wireless device transmits a second signal based on the second protocol stack to establish a second connection with a second cell before the first connection is fully confirmed. This advance preparation ensures that a backup connection is already in place, improving handover success probability while managing complexity through controlled sequencing.
Solution Approach 2:
The patent implements dynamics by making the protocol stack activation process adaptive and conditional. The system dynamically adjusts the activation sequence based on received response messages - when a second response message is received before the first response message, the first protocol stack is deactivated. This dynamic behavior allows the system to respond to changing network conditions, improving reliability without requiring permanent complex structures.
2Device complexity
If sequential protocol stack activation is used, then system complexity is reduced, but latency increases
Solution Approach 1:
The patent reduces latency by performing preliminary action - activating the second protocol stack before the first one is fully established. This allows the second connection to be prepared in advance, so that if handover is needed, the transition can occur more quickly. The wireless device sends the second signal early in the process, overlapping with the first connection establishment, thereby reducing overall handover time without requiring full parallel processing.
3Reliability
If simultaneous protocol stack activation is implemented, then handover success probability is improved, but resource consumption increases
Solution Approach 1:
The patent optimizes energy consumption by making protocol stack activation dynamic and conditional rather than permanently simultaneous. The system activates the second protocol stack temporarily and deactivates the first stack when the second response is received before the first response. This dynamic approach ensures that multiple stacks are not maintained concurrently for extended periods, reducing energy consumption while still providing the reliability benefits of having multiple active stacks during the critical handover window.
Data Source
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AI summary
A method for a wireless device of a wireless communication system is described herein. In one embodiment, the method comprises: transmitting, by a wireless device and based on a first protocol stack, a first signal to establish a first connection with a first cell; transmitting a second signal, based on a second protocol stack, to establish a second connection with a second cell; and deactivating the first protocol stack based on receiving a second response message for the second signal and before receiving a first response message for the first signal.