Wave ppt Wireless Access in Vehicular Environment
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WAVE (Wireless Access in Vehicular Environments) uses dedicated short-range communications (DSRC) technology to enable high-speed vehicle-to-vehicle and vehicle-to-infrastructure communication. It has applications in intelligent transportation systems for vehicle safety and Internet access. A WAVE system consists of roadside units (RSUs) that broadcast information to onboard units (OBUs) in passing vehicles. OBUs listen for safety information on a default control channel and can join local wireless networks called WAVE basic service sets to receive additional information on other channels.
Wave ppt Wireless Access in Vehicular Environment
- 1. 12/08/17 1 WAVE (Wireless Access in Vehicular Environment) D V S Ramanjaneyulu M.tech Assistant professor
- 2. Wireless Access in Vehicular Environments (WAVE) is the next generation dedicated short-range communications (DSRC) technology, which provides high-speed vehicle -to vehicle (V2V) and vehicle -to infrastructure (V2I) data transmission and has major applications in intelligent transportation systems (ITS), vehicle safety services and Internet access. 12/08/17 2 AIM:
- 3. 12/08/17 3 Role of communication-based systems 1 2 3 4 6 8 7 5 “360 Degrees Driver Situation Awareness” using wireless comm.
- 4. INTRODUCTION TO WAVE SYSTEMS • The FCC granted the request in October of 1999. The DSRC-based ITS radio services received 75 MHz of spectrum in the 5.85–5.925 GHz range. • In 2004 802.11 standard to include vehicular environments. The document is known as IEEE 802.11p. IEEE 802.11p and IEEE 1609.x are called wireless access in vehicular environments(WAVE). 12/08/17 4
- 5. 12/08/17 5 Cont….. wireless local area networks (WLAN, or Wi-Fi), researchers and developers have found their wide application perspectives in a vehicular environment, which spawns a new type of vehicular network: wireless access for vehicular environment system. WAVE system is to establish physical platform for both intelligent transportation systems (ITS) and vehicular infrastructure integration (VII). • WAVE systems adopt orthogonal frequency-division multiplexing • Data rates of 6-27Mbs/s.
- 6. REAL TIME TRAFFIC IMAGE SHARING 12/08/17 6
- 7. COMPONENTS OF A WAVE SYSTEM WAVE system consists Roadside units (RSUs) announces to OBUs 10 times per second the applications it supports, on which channels Onboard units (OBUs) listens on channel 172 authenticates RSU digital signature executes safety apps first then, switches channels executes non-safety apps returns to channel 172 and listens 12/08/17 7
- 8. WAVE system showing the typical locations of the OBUs and RSUs 12/08/17 8
- 9. Cont….. By default, WAVE units operate independently, exchanging information over a fixed radio channel known as the control channel. they also can organize themselves in small networks called WAVE basic service sets (WBSSs). IEEE 802.11 WBSSs can consist of OBUs only or a mix of OBUs and RSUs. All the members of a particular WBSS exchange information through one of several radio channels known as service channels (SCHs). WBSS can connect to a wide area network 12/08/17 9
- 10. COMMUNICATION PROTOCOLS WAVE architecture supports two protocol stacks Internet Protocol version six (IPv6) WAVE Short-Message Protocol (WSMP) 12/08/17 10
- 11. Cont….. The reason for having two protocol stacks is to accommodate high-priority, time-sensitive communications, as well as more traditional and less demanding exchanges WSMP enables the application to send short messages and directly control certain parameters of the radio resource to maximize the probability that all the implicated parties will receive the messages in time. 12/08/17 11
- 12. COMMUNICATION PROTOCOLS 12/08/17 12 WAVE communication stack indicating the standard that covers each set of layers.
- 13. list of the protocols that compose the WAVE communications stack 12/08/17 13
- 14. Dedicated Short Range Communications(DSRC) 5.850-5.925 GHz range • divided into 7 channels (each 10 MHz) Short range radio • 300m (1000m max) High data rate • 3-27 Mbps Half-duplex • station can only send or receive, but not both at the same time 12/08/17 14
- 15. DSRC Channel Allocation 12/08/17 15 •2 small zone and 2 medium zone service channels are designated for extended data transfer. •2 service channels are designated for special safety critical applications . •Public safety applications and messages have priority in all channels.
- 16. 12/08/17 16 Simplified User-Side Process Flow •Any device may act as Provider or User • Device defaults to Control Channel (CCH) monitoring when not joined to a WBSS • Returns to CCH monitoring when complete