Calypso Wireless (fka CLYW)

[HighRider]

From documents in the appendix http://support.t-mobile.com/doc/tm... From page 2 of 7

When you're not in range of a Wi-Fi connection, your normal cellular network takes over and keeps you connected. Your phone switches automatically from Wi-Fi to cellular whenever it’s necessary to maintain your connection, whether your phone is in idle mode or in the middle of an active call. The switching process is virtually unnoticeable.

Wi-Fi enabled devices (laptops and PDAs as well as UMA phones) can send and receive data wirelessly from any location equipped with Wi-Fi access. This is accomplished using wireless routers, installed within a Wi-Fi location. A wireless router transmits an RF signal to Wi-Fi enabled devices that are within range of the router. Depending on the particular router, its range is usually about 300 feet. The speed of the transmission is governed by the speed of the pipeline fed into the wireless router.

NOTE: After the network is saved to your Saved Networks list, you will automatically connect to that network each time you are within range.

My Question?There is no mention of signal strength, only whether you're within range of the wifi signal. Isn't the assumption, you are on wifi in your home as long as you receive the signal? There is nothing about signal strength and in fact you don't need to measure signal strength, either you have a signal or you don't. Tmob wants to use signal strength to switch. O.K. In their scenario where you have several wifi access points available, when the signal strength drops does the device switch to cell or pick up the other saved wifi access point? In the first paragraph, it would seem, the device would remain on wifi as long as it was within range of any wifi access point and would only switch when there was no wifi available. The intent is to always keep the device on wifi even if the signal strength for the second access point is less than the first. I haven't seen anything that talks about the level of signal strength. You can say you measure signal strength, but all you need to determine is whether you have a signal. Has Tmob provided anything that says, when the wifi access point reaches x, then we switch. If they have I haven't seen it and it really doesn't matter because their application doesn't seem to support that theory.

Once set up for Wi-Fi connectivity, your phone will automatically use Wi-Fi, when available, for all your mobile phone services. You can simply use your phone in a normal manner; there is nothing special you need to do. Your phone will switch automatically between Wi-Fi and cellular whenever it’s necessary to maintain your connection, whether your phone is idle or on an active call. When connected to Wi-Fi, the signal bars will change and the wireless network name will display in the upper left of the main screen as shown in Figure 1.


To connect to Wi-Fi from the Available Networks list, perform the following steps:
1. From the main screen, press the Menu soft key to access Menu mode.
2. Using the Navigation keys, scroll to Settings, and then press the Select key to access the menu.
3. Highlight the Wi-Fi option and press the Select key.
4. Highlight the Available Networks option and press the Select key.
5. The phone searches for all available networks and then displays a list of available networks, similar to that shown in Figure 1.


From what I'm reading here the wifi connection is used while you are in range of the wifi router. If not the system automatically switches you to the cell network. I don't see anything here that talks about selecting based on signal strength. In fact, there is a way to select a wifi connection when there are several wifi access points available and they have differing strengths. If you are switching based on signal strength, why would you list all of the available access points unless it only matters that one is available. There doesn't seem to be a prohibition on selecting an access point with lower signal strength. Sure you can incorporate any measurement you want, but it isn't necessary.

From deposition transcript.
Q. So is it correct that the user must stay within the range of the wi-fi device to remain on an active session?
A. Yes.

Question? Isn't this an admission that there is a range and if you aren't within that range, the device will switch?