---

---

between MS to BTS

---

Posted by saqlain231

Um is an air interface between MS and BTS for radio communication.

---

Posted by Hash007

The air interface between the MS (Mobile Station) and the BTS. This interface uses LAPDm protocol for signaling, to conduct call control, measurement reporting, Handover, Power control, Authentication, Authorization, Location Update and so on. Traffic and Signaling are sent in bursts of 0.577 ms at intervals of 4.615 ms, to form data blocks each 20 ms.

---

Posted by ravi_195