1. Introduction
1.1. Coupling Approaches
1.2. Context Transfer
1.3. TCP-Specific Handover Problems
1.4. Mobility Management Framework
1.4.1. Our Contributions
2. Cross-Layer between Layer-2 Sublayers
2.1. The InterWorking (IW) Sublayer
2.2. IW ARQ Context Transfer Mechanism
2.3. An Example of IW ARQ Operation for Handover from UMTS to WiMAX
2.4. Signaling and Primitives
2.5. Simulation Environment and Results
Parameter | Setting |
---|---|
IW fragment switch | OFF |
IW default window size | 30 blocks |
IW status report timer period | 2.5 sec. |
UMTS PHY data rate | 64, 1024 Kb/s |
UMTS PDCP queue length | 25 |
WiMAX queue length | 50 blocks |
WiMAX PHY data rate | 2 Mb/s |
TCP variant | Reno |
TCP MSS | 512 bytes |
TCP default congestion window | 32 segments |
TCP minimum RTO timer period | 0.2 sec. |
Application type | FTP |