IPv6 vehicular networking for safety and data services

다국어 초록 (Multilingual Abstract)

Recently, there are various reliable services to transmit useful information from vehicles to the Internet cloud server or other vehicles for safety. To achieve main requirements of safety and data services in vehicular networks, we devise two clever schemes; 1) fast network prefix and service discovery scheme and 2) TCP context migration scheme. First, in fast network prefix and service discovery scheme, we define novel options for prefix and service discovery in IPv6 neighbor discovery (ND) where an moving network (MN) or an fixed network (FN) can quickly exchange prefix and service information by sending the neighbor solicitation (NS) and neighbor advertisement (NA) messages containing a sender’s prefix and service information. We compare our proposed ND scheme with the traditional scheme via mathematical analysis. The result shows that our approach can reduce the overall delay. Thus, it can efficiently provide diverse intelligent transportation services such as cooperative adaptive cruise control, forward collision warning, and electronic emergency brake light in vehicular environment. Second, we propose high performance TCP context migration scheme (TOMS) to improve various performances for data services in vehicular networks. To support the reliability of data transmissions in vehicular environment, TCP is the most preferable transport layer protocol. However, heavy burdens of TCP initialization phase severely degrade the performance of data transmissions in vehicular environment. To alleviate the problem, we provide a proactive TCP connection initialization using a moving TCP proxy as a cluster head, which will have the Internet connectivity with a Road-Side Unit (RSU). A cluster member can initiate its TCP connection toward its corresponding TCP end-system via the TCP proxy within its cluster. The TCP proxy performs the TCP connection set-up for the sake of other cluster member vehicles and acknowledges the received TCP segments toward these vehicles. When the TCP proxy moves out of the communication range of the RSU, it transfers the TCP contexts of other vehicles to another vehicle, which will play the role of a TCP proxy through the proposed TCP context migration scheme. Also, the RSU works as a fixed TCP proxy for handling the acknowledgement of TCP segments and TCP timer handling (e.g., persist timer and keep-alive timer) when there happens the disconnection between the moving proxy and the RSU. Thus, it is shown that our TOMS outperforms the legacy TCP in vehicular networks.

목차 (Table of Contents)

• I. Introduction 1
• II. Related Work 6
• III. Proposed IPv6 Neighbor Discovery for Prefix and Service Discovery 11
• III.1. Scenarios in Vehicular Communication 14
• III.2 Procedure of Service Discovery for Vehicular Networking 16
• III.3. ND EXTENSION FOR PREFIX AND SERVICE DISCOVERY 18
• IV. Design of TCP Context Migration Scheme 23
• IV.1. TCP Connection Situation 24
• IV.2. Cooperative Mode 26
• IV.3. TCP Setup Procedure 28
• IV.4. TCP Migration Scheme 30
• IV.4. Network Architecture 37
• V. Delay Analysis for Prefix and Service Discovery 40
• VI. Simulation Design 43
• VII. Evaluation 44
• VII.1. Analysis of TCP setup time 46
• VII.2. Analysis of throughput 49
• VII.3. Analysis of variations due to other factors 52
• VIII. Conclusion and Research Issues 54
• References 56
• Korean Abstract 61