For capacity test on UMTS test case, we support 300,000 MNs with Performance Accelerator (3 processes), it means that we can run 100,000 MNs per one process. But we only support 50,000 MNs with Mobility test per one process, only half as capacity test. This has been a limitation on GPRS mobility. The LLC layer is being used by both the Target and Source Gb. It is probably memory constricted sense this layer configures a bunch of timers which would be doubled when mobility is being used.