Mobile Station Cell Selection for Radio Access Technology Handover
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Solution Overview
Problem
Conventional mobile communication systems face increased processing load and connection delays due to late handovers between radio access technologies (RATs) during connection setup, especially when a mobile station in idle mode requests a service that the current RAT cannot efficiently provide.
Innovation Solution
Implementing a method where mobile stations autonomously select a suitable cell based on notified communication services and priorities from network nodes, allowing for early determination and initiation of the most appropriate connection procedure without the need for late-stage handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handover between radio access technologies is performed at a late stage in the connection setup procedure, then the mobile station can complete initial connection establishment, but processing load on network nodes increases and connection delay increases
Solution Approach 1:
The patent applies preliminary action by having the mobile station determine the target radio access technology and cell before initiating the connection setup procedure. The mobile station uses stored service information to identify which RAT can provide the requested service and autonomously selects the appropriate cell, thereby performing the handover decision in advance rather than during the connection procedure. This eliminates late-stage handovers and reduces connection delay while maintaining reliable service establishment.
2Reliability
If handover between radio access technologies is performed at a late stage in the connection setup procedure, then the mobile station can complete initial connection establishment, but processing load on network nodes increases
Solution Approach 1:
The patent applies self-service by enabling the mobile station to autonomously determine the target radio access technology and select the appropriate cell based on stored service information. The mobile station independently makes the handover decision without requiring network nodes to perform complex evaluations during the connection procedure. This shifts the decision-making burden from the network to the mobile station, thereby reducing processing load on network nodes while ensuring reliable connection establishment to the appropriate service-providing RAT.
3Adaptability or versatility
If a mobile station in idle mode requests a service that the current RAT cannot efficiently provide, then service compatibility is ensured, but late handover increases connection delay and processing load
Solution Approach 1:
The patent applies preliminary action by having the mobile station use stored service information to determine the appropriate target radio access technology before initiating connection setup. When the mobile station is in idle mode and requests a service, it consults its stored information about which RATs can provide which services, and proactively selects the most suitable RAT and cell. This advance determination ensures service compatibility while eliminating the need for late-stage handovers, thereby reducing connection delay.
4Adaptability or versatility
If a mobile station in idle mode requests a service that the current RAT cannot efficiently provide, then service compatibility is ensured, but late handover increases processing load
Solution Approach 1:
The patent applies self-service by enabling the mobile station to autonomously determine the target radio access technology based on stored service information. When a service is requested, the mobile station independently evaluates which RAT can provide the service and selects the appropriate cell without requiring network nodes to perform service compatibility checks during the connection procedure. This self-determination ensures service compatibility while significantly reducing processing load on network nodes.
Data Source
AI summary
A mobile communication method according to the present invention includes: notifying, from a network node (200, 300) to a mobile station (100), a communication service provided by a target radio access technology in which the mobile station (100) is to be in idle mode; storing, at the mobile station (100), the communication service notified by the network node (200, 300); and starting, at the mobile station (100), a connection procedure on the basis of the stored communication service.