With the advancement of 3G technologies like Universal Mobile Telecommunication System (UMTS), the application of TCP has become very popular for a trustworthy end-to-end (e2e) data delivery. However, TCP was basically created for wired networks and thus it is afflicted with performance degradation because of the radio signal getting impacted by fading, shadowing and interference. There are numerous techniques suggested by the research community regarding how to enhance the performance of TCP over wireless links like introducing link-layer retransmission, explicitly notifying the sender of network conditions or using new variants of TCP. As UMTS network coverage and availability are presently going through rapid growth, optimisation of various internal components of its wireless network is essential. One of the optimization is the introduction of High Speed Downlink Packet Access (HSDPA). This particular architecture not just enables higher data rates but additionally more reliable data transfer by the introduction of Hybrid ARQ (HARQ). With this enhancement to the UMTS network, it becomes essential to see the performance of TCP in this particular network. Thus in this dissertation, we attempt to judge 2 areas of UMTS networks: first, the impact of HSDPA parameters like scheduling algorithm and…
Contents: Performance Evaluation of TCP Variants over UMTS Networks
1 Introduction
1.1 Related Work
1.2 Contribution
1.3 TCP in Wireless Networks
1.3.1 Link Layer Solutions
1.3.2 Split TCP solutions
1.3.3 Explicit Notification
1.3.4 End‐to‐End solutions
2 UMTS Network
2.1 UMTS Network Architecture
2.2 UMTS Protocol Architecture
2.2.1 Network Layer
2.2.2 The RLC Protocol
2.2.3 The MAC Protocol
2.2.4 The Physical Laye
2.3 HSDPA in UMTS
2.3.1 Radio Interface and Network Architecture for HSDPA
2.3.2 HS‐DSCH MAC Architecture
2.3.3 Node B flow control
2.3.4 Hybrid‐ARQ (HARQ) with soft combining
2.3.5 Fast Link Adaptation
2.3.6 Fast Scheduling at Node B
3 Simulation Paradigm
3.1 NS‐2
3.2 EURANE Model
3.3 Wireless channel characteristics and propagation model considered in EURANE
3.3.1 Channel model
3.3.2 Propagation model
3.3.3 Simulation parameters settings and Performance metrics
3.4 Considered TCP Variants for the simulation
3.4.1 Packet Loss based congestion control
3.4.2 Delay based congestion control
4 Performance of different TCP variants in UMTS networks
4.1 Introduction
4.1 Introduction
4.2 Performance Evaluation…
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