 for small business and/or remote areas. Availability and mobility (handover and roaming) provided applicability and increased usability to further domains of activity such as remote measurement and measurement on the move that are presented hereby. The technical aspects are introduced based on a real case study [1] based on a workbench with high-speed data acquisition by a digital oscilloscope and with real- time transmission [2] via mobile networks-GSM/UMTS-GPRS [3,4] that pro- vided the transport. The "real-time" concept in mobile networks is characterized by the fact that allowed transfer times are limited (lower) by the conversational nature of the architecture. It must also be considered that the time relationship between information entities ("time-stamps" of "events"-in the interrupts' treatment per- spective) should not be affected by streaming. In multimedia, delays, or jitter have rather perceptual-physiologic (upper) limits-as much as human perception of video and audio allows. In this case study, time-relationship is carefully controlled by the data acquisition subsystem-before packing at transmitter side, acquired data can be sent without strict timing, provided the transfer is fast-enough, and Tele-Measurement Services for m-Learning reconstruction at the receiving side can be done precisely, inside the same percep- tual delay allowed: for instance, for an usual oscilloscope, this must be lower than "retina persistence" which must be lower than "phosphor persistence"-so, again, a human perceptual limit like for normal video streaming (e.g., mobile video-tele- phony, mobile "video on demand," mobile IP-TV, etc.). Characteristic to this approach of data streaming for remote-measurement is the use of a real, existing PLMN. The testbed [5] had the architecture of Figure 12.1, with a Radio Access Network (BTS-Base Transceiver Station/Node B-UMTS Base station, BSC-Base Station Controller/RNC-Radio Network Controller), Switching Center (MSC-Mobile Switching Center and TRAU-Transcoding and Rate Adaption Un