To: Ramsey Su who wrote (103 ) 7/24/1999 11:36:00 AM From: Ron M Respond to of 13582
The following link is from a National Science Foundation symposium regarding Tetherless T3 and beyond. Participation by QCOM and UCSD as well a lot of info regarding 3G and visions of the future.cudenver.edu There apppears to be a lot of info here, discussion?? An excerpt from the Executive Summary; The following is a report on the discussions and findings of a workshop held in Denver, CO on November 19 and 20, 1998 that addressed the characteristics and possible applications of future-generation wireless communications systems. Thirty-four experts on various aspects of wireless communications, from the physical to the applications layers, were in attendance. To give a specific topic for discussion, the question posed to the participants was "What research needs to be done to achieve full T3 (45 megabits per second) via the wireless medium by 2005?" The workshop identified several potential applications of wideband wireless communications, including virtual navigation, telemedicine, infostations, telegeoprocessing, crisis management, education via the Internet, and computer- and network-aided remote collaboration. Another clip regarding wireless and T3 T3 Wireless Applications and Their Impact on Network Design. T3 applications generally involve the transfer of large data blocks in real time, or the streaming of high-resolution video or both, such that lower data rates (in the Mbps range) would not be adequate. Several examples were given earlier. In examining these and other similar T3 applications, one identifies some recurring features that are likely to have important impact on network protocol design. Among these are: (1) Traffic asymmetry. In most cases, the T3 data rate is from base station to the mobile (one exception might be telemedicine). This greatly simplifies the problem since the base station has full control (and thus can better allocate) the outbound channel to the mobiles. (2) Streaming versus burst transmissions. Streaming requires bandwidth preallocation, possibly over several cells. Bursts also require a setup (for example, beamforming). (3) Mobility pattern. The predictability of the mobility pattern (based on previous measurements) can have major impact on resource preallocation policies. (4) Ability to adapt to resource reductions and/or to channel degradation in the network, or even temporary loss of connectivity. For example, the application may be able to reduce its data rate, at the expense of QoS degradation. (5) Ability to adjust to the limited and diverse interface capabilities of the mobile. For instance, if the mobile is a cell phone, the application will convert text to speech, or will reroute data to a proxy, which can do the translation. Likewise, if the cell phone is connected to other local devices (e.g., laptop, etc.), the application will be able to detect and exploit that. If the application cannot adjust to the end device capabilities, then the network protocols may need to intervene (for example, by dropping high-resolution substreams of a hierarchically coded stream).