1. Receiving UTRAN- 2. Repress Core network Station/PC RS232/USB Mobile Figure 12.3 Remote measurement over PLMN with both probe and client mobile. Tele-Measurement Services for m-Learning specific advantage of GPRS-it does not require establishing a connection, it is always connected-is considered crucial for applications where time and quick reaction to events is important. The trade-off for mobility, carefully addressed hereby, is the lower rate (compared with fixed networks), and dependency on radio environment and number of users (hereby addressed by the QoS). Measurement of data streaming QoS was also documented [10]; considering mobility, they were interesting contributions in IPv6 test-beds-our work aims to extend such research in cellular communications data streaming. Different applications were considered, like meteorological distributed pro- cessing platforms or telemedicine [11], industrial communications (closest to this case study). 12.1.1 Objectives The goal was to establish a remote-measurement connection which is reliable and to perform several tests in order to determine the best method to transmit electrical experimental data aiming for a real-time effect in manipulation and operation of remote test equipment like being local, on-site. TCP/UDP transmission [12,13] was used. The network elements in this case are divided between the network trans- port medium which enables the transmission and the data acquisition equipment. Identifying the impact of their technical limitations on the remote measurement was one of the purposes of our study. 12.1.2 Implementation Data Acquisition (DAQ) equipment (together with sensors/transducers and local signal conditioning) applied to the unit-under-test, attached to the portable ("palm- top" or "lap-top") or fixed ("desk-top") PC, is identified as "the probe." The portable or fixed PC at the receiving side is the client that collects the remotely measured val- ues. The probe and the client can both have mobile connections (e.g., wireless access using a mobile