Wireless Terminal Network Selection Using Guaranteed Data Rate
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Solution Overview
Problem
Current methods for network selection by wireless terminals in heterogeneous environments fail to consider data rate differences, leading to potential delays or interruptions in data transmission and unnecessary selection of more expensive mobile communication networks over WLAN, even when WLAN reception power is slightly lower.
Innovation Solution
A method where wireless terminals calculate the guaranteed data rate of each network using reception power, compare it to a minimum guaranteed data rate, and select the network with the lowest selection factor value, which is determined by the guaranteed data rate and average cost per packet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the wireless terminal selects network based on weight values calculated from reception power and priority only, then the selection process is simple, but data transmission may be delayed or interrupted because data rate differences are not considered
Solution Approach 1:
The patent extends the network selection criteria by adding data rate as a new parameter to the existing weight value calculation. The selection formula is modified to W = 1000×PW + Pr + (1 - R/Rmax)×Wd, where R represents the data rate of the interface and Wd is the weight of data rate. This parameter expansion ensures that networks with insufficient data rates are penalized in the selection process, preventing transmission delays and interruptions while maintaining a systematic selection approach.
2Speed
If the wireless terminal selects network based on reception power and priority, then the selection is fast, but the less expensive WLAN will not be selected when its reception power is slightly less than mobile communication network
Solution Approach 1:
The patent introduces data rate as an additional parameter in the weight value calculation to differentiate between network types. Since WLAN typically offers higher data rates than mobile communication networks, the data rate component (1 - R/Rmax)×Wd will favor WLAN when its reception power is slightly lower. This allows the system to select the more cost-effective WLAN network even with marginally lower reception power, reducing communication costs while maintaining selection speed through the unified formula approach.
Data Source
AI summary
Disclosed is a method for selecting a communication network by a wireless terminal, the method including receiving a signal having a predetermined reception power level from one or more communication networks, and calculating a guaranteed data rate of each of said one or more communication networks by using the predetermined reception power level of the signal; comparing the calculated guaranteed datarate with a minimum guaranteed datarate; and calculating a selection factor value of each of said one or more communication networks by using the guaranteed datarate when all guaranteed datarate of said one or more communication networks are equal to or greater than the minimum guaranteed datarate, and selecting a communication network having a lowest selection factor value.