Early Radio Access Technology Handover for Mobile Stations
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Solution Overview
Problem
Conventional mobile communication systems experience increased processing load and connection delays due to late-stage handovers between radio access technologies (RATs) when a mobile station in idle mode requests a service not provided by its current RAT or when a more efficient RAT is available, leading to inefficient service setup and user-plane connection establishment.
Innovation Solution
Implement a method where the radio controller apparatus determines and instructs an early handover to a more efficient RAT based on the mobile station's capabilities and the type of communication service requested, reducing processing load and connection time by selecting the appropriate RAT at an early stage in the connection setup procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handover to a different RAT is performed at a late stage in the connection setup procedure, then the mobile station can establish connection in the current RAT, but processing load on access nodes increases and connection time increases
Solution Approach 1:
The invention performs preliminary determination of the appropriate RAT and preliminary handover instruction before the connection setup is fully established. The radio controller determines whether handover to a different RAT is needed and instructs the mobile station to perform handover at an early stage (Step 15 in Fig. 12), before subsequent setup steps (Steps 16-20) would otherwise occur. This preliminary action reduces both processing load and connection time.
2Reliability
If handover to a different RAT is performed at a late stage in the connection setup procedure, then the current RAT connection setup can proceed, but processing load on access nodes increases
Solution Approach 1:
The radio controller performs preliminary determination of the appropriate RAT and issues preliminary handover instruction at Step 15, before the mobile station and access nodes would otherwise engage in extensive connection setup procedures. This early determination prevents unnecessary processing load on access nodes by avoiding late-stage handover operations.
3Adaptability or versatility
If the mobile station requests a service not provided by the current RAT, then the mobile station can use the current RAT, but service efficiency decreases
Solution Approach 1:
The radio controller performs preliminary determination of whether the requested service is provided by the current RAT and whether handover to a different RAT would be more efficient. This preliminary assessment occurs at Step 15, before the connection setup proceeds, ensuring the mobile station is directed to the most appropriate RAT for the requested service, thereby maximizing service efficiency while maintaining adaptability.
Data Source
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AI summary
A mobile communication method according to the present invention includes: transmitting, from a mobile station (100) to an access node (200) in a first radio access technology, a connection request signal including a desired call type for communication and a radio access capability of the mobile station (100); determining, at the access node (200) in the first radio access technology, whether or not to perform handover to a second radio access technology on the basis of the desired call type for communication and the radio access capability of the mobile station included in the connection request signal; and transmitting, from the mobile station (100) to an access node in the second radio access technology, a connection request signal, when it is determined that the handover to the second radio access technology is to be performed.