SMpSDU – Support Mode for predefined SDU size
The UMTS Iu Interface uses the Ô Iu Protocol Õ which can be operated in either TrM (Transparent Mode) or SMpSDU (Support Mode for predefined SDU size mode). SMpSDU is intended for those RAB (Radio Access Bearer) that require extra functionality from the Iu user part protocol other than transfer of user data.
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