© 1996–2011 by David Thompson
Wideband test bed for multimedia and Internet access Stockholm, Sweden, November 1996
Mobile multimedia and Internet access while you’re on the move…
…just two examples of demanding applications that wireless operators already have to deal with today. Right now, Ericsson is taking the lead in wideband transmission of data and multimedia over mobile phone networks. In Stockholm, Sweden, Ericsson is carrying out continuous research based on its wideband test bed. The wideband test bed consists of portable equipment in a moving vehicle interacting with equipment in an indoor laboratory. The test uses 5 megahertz of bandwidth in the 2-gigahertz frequency range.
Split screen: fast-moving test vehicle + indoor lab
The vehicle contains both user and operator terminals.
0:08 – G(öran) + guest (= users)
The user’s terminal can be used to select one of three modes: speech, video, or Internet.
0:13 – Three terminals
The operator’s terminal consists of a man– machine interface that’s used to enter commands and to check, among other things, the status of the radio protocol and the status of the boards. Selecting a service is straightforward. To make a phone call, for example, simply select speech from the on-screen phone handset and click the yes button.
0:08 – On-screen handset, select speech 0:03 – CU MMI
The system activates and a speech connection is established.
0:06 – Users 0:16 [shorten?] – CU SCU on MMI
Speech quality is extremely high and totally free from interference, both in the test vehicle… WBTB script, draft 03
0:05 – Guest on phone 0:09 – Operator in lab Page 1/5
© 1996–2011 by David Thompson
…and in the laboratory. 0:06 – Users Selecting video from the on-screen handset results in a fast, stable two-way video connection. A camera in the vehicle transmits pictures to Ericsson’s wideband test bed laboratory.
0:06 – On-screen handset, select video 0:06 – MMI 0:08 – User terminal (z/in) 0:08 – Users + camera 0:13 – Lab terminal (z/out)
In the laboratory, the picture received from the moving vehicle is just as stable.
0:04 – Three lab terminals + operator 0:12 – Lab camera > terminal (z/out)
The operator can monitor how the system is interacting with the network at all times.
0:05 – Users G: Here you can see the graphs. The red one shows what we’re receiving from the RNC, and the blue one shows what we’re transmitting to the RNC. 0:10 – Three terminals
Here we can see how the radio channel varies over time.
0:07 – CU MMI showing RAKE tap positioning, delay power spectrum changing
The route taken by the test vehicle is designed to ensure that the mobile system is also subjected to adverse conditions during testing.
0:14 – Vehicle driving into tunnel
One of the main aims of Ericsson’s wideband test bed is to improve speed – continuously. Fast throughput is the key to mobile wireless access. The current throughput rate when using Internet browsers or file transfer protocols is 128 kilobits a second.
0:10 – MMI + op. terminal G: [the frequency] is around 120 kilobits a second but the service we’re running is 128 kilobits a second. That’s at the limit – the target limit.
Logging on to the Internet is also simply a matter of making a selection from the virtual handset.
0:10 – Users G: …select Internet.
A browsing tool is then used to access the World Wide Web or other Internet services in the usual way.
0:15 – Users + op. terminals • Netscape starts up • Password shot
0:06 – Phone handset, select Internet
0:06 – CU user keyboard w. hands WBTB script, draft 03