Abstract of the seminar paper
This seminar paper provides a summary of han- dover measurements for packet oriented mobile data services between different radio access technologies (inter-RAT handover) in a field trial. This includes measurements between third- (3G) and second-generation (2G) mobile telephony communication standards for data communication like Long Term Evolution (LTE) and its predecessors Evolved High Speed Packet Access (HSPA+), Universal Mobile Telecommunications System (UMTS), Enhanced Data Rates for GSM Evolution (EDGE) and General packet radio service (GPRS). The project goal was to measure handover-related data transmission failures respectively han- dover interruption times. The measurements were collected in the network of the german mobile network operator T-mobile within different locations by using a WebSocket connection between the mobile device and a server. The results show that shorter interruption times could be expected for a handover between UMTS/HSPA+ and GPRS/EDGE than between LTE and UMTS- /HSPA+. The interruption time caused by an inter-RAT handover event were around 4.5 (LTE → UMTS/HSPA+, packet size 120 & 1412 bytes), 3.67 (UMTS/HSPA+ ↔ GPRS/EDGE, packet size 120 bytes) and 3.0 seconds (UMTS/HSPA+ ↔ GPRS/EDGE, packet size 1412 bytes).