January 2006 doc.: IEEE 802.15- 15-06-0020-00-wng0 January 2006 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Vehicular Wireless Media Network (VWMN)] Date Submitted: [16 January, 2006] Source: [Lothar Stibor] Company: [Philips] Address: [Philips & ComNets, Chair of Communication Networks, RWTH Aachen University, Kopernikusstr. 16, 52074 Aachen, Federal Republic of Germany] Voice: [+49 241 8020547], FAX: [+49 241 8022242], E-Mail: [lsr@comnets.rwth-aachen.de] Re: [] Abstract: [A distributed broadband MAC for inter-vehicle communication] Purpose: [Presentation in 802.15 WNG SG] Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15. Lothar Stibor, Philips Lothar Stibor, Philips

Vehicular Wireless Media Network (VWMN) January 2006 Vehicular Wireless Media Network (VWMN) A distributed broadband MAC for inter-vehicle communication Lothar Stibor, Philips

Overview Motivation Problem statement VWMN MAC specification January 2006 doc.: IEEE 802.15- 15-06-0020-00-wng0 January 2006 Overview Motivation Problem statement VWMN MAC specification Benefits of VWMN Challenges Synchronization Dynamic topology control Conclusion and outlook Lothar Stibor, Philips Lothar Stibor, Philips

Will 802.15 address mobility in WPAN? January 2006 Will 802.15 address mobility in WPAN? WLAN & WPAN standardization is facing similar general problems Coverage extension Growing demand on throughput Changing network topology WLAN WPAN Mesh networking 802.11s 802.15.5 High data rate 802.11n 802.15.3a/c High mobility 802.11r/p ??? Lothar Stibor, Philips

Vehicular Applications January 2006 Vehicular Applications Media type applications Internet on the road Access to the company network Download latest customer data Working context transfer Entertainment Content (media) sharing Safety Traffic jam warning Hazard warning Emergency car approaching Cooperative driving Lothar Stibor, Philips

Mobility oriented Applications for WPANs January 2006 Mobility oriented Applications for WPANs Interconnection among handheld devices Audio (cordless headset) Content download (MP3 player, photo camera) Internet file transfer & audio/video streaming (PDA, cell phone) Temporarily & rapidly set-up mesh network Indoor location based services Healthcare Hospital personnel and equipment tracking Inventory tracking Patient monitoring/management Sensor networks Premium service e.g. Voice over IP Lothar Stibor, Philips

January 2006 Spectrum allocation Spectrum allocation for Dedicated short range communication (DSRC) Multiple channels Broad band High data rate (Media Type) applications Mobile-to-mobile Mobile-to-infrastructure Lothar Stibor, Philips

Problem statement for Mobile Ad-hoc Network (MANET) MAC January 2006 Problem statement for Mobile Ad-hoc Network (MANET) MAC Application supports Premium (Safety relevant) applications Media type applications Considering changing network topology MAC efficiency Quality of Service Ad-hoc, self organization Multi-channel support Multi-hop extension Lothar Stibor, Philips

Overview on VWMN MAC Key Assets Synchronized MAC January 2006 Overview on VWMN MAC Key Assets Distributed beaconing algorithm Learning topology through beaconing Contention free channel access based on topology information Contention based channel access optional Synchronized MAC More efficient premium service QoS for media type app. Supports multiple channels Lothar Stibor, Philips

Synchronized Superframe Structure January 2006 doc.: IEEE 802.15- 15-06-0020-00-wng0 January 2006 Synchronized Superframe Structure Synchronized superframe consisting of n channel time slots Beacon period (BP) (m beacon slots) for beacon transmission Data period (DP) (n-m slot) for data exchange Lothar Stibor, Philips Lothar Stibor, Philips

Distributed Beaconing Scheme January 2006 doc.: IEEE 802.15- 15-06-0020-00-wng0 January 2006 Distributed Beaconing Scheme 1 2 3 4 5 6 7 Information in Beacons MAC ID & beacon slot number GPS information Beacon period bitmap (neighborhood bit map) Channel reservation information Purpose of beaconing Synchronization Topology control Channel access coordination 7 6 5 1 2 4 3 Y X Directly received beacon Learned from neighbors beacons Beacon Period ( BP ) Lothar Stibor, Philips Lothar Stibor, Philips

VWMN Channel Access Methods January 2006 doc.: IEEE 802.15- 15-06-0020-00-wng0 January 2006 VWMN Channel Access Methods Distributed Resource Reservation Protocol (DRRP) Reservation is made for the following DP Reservation information is broadcasted in beacons Contention based channel access (EDCA) Make use of the unreserved channel resource Similar to EDCA in IEEE 802.11e Lothar Stibor, Philips Lothar Stibor, Philips

Benefits of VWMN MAC QoS support for January 2006 doc.: IEEE 802.15- 15-06-0020-00-wng0 January 2006 Benefits of VWMN MAC QoS support for Time critical (safety relevant) applications Media Type applications Higher MAC efficiency with reservation based channel access Support for multi-channel Capable of multi-hop connection Lothar Stibor, Philips Lothar Stibor, Philips

Challenges of VWMN MAC (1/2) January 2006 doc.: IEEE 802.15- 15-06-0020-00-wng0 January 2006 Challenges of VWMN MAC (1/2) Synchronization issues Clock inaccuracy Time shifts between independent beacon groups 3-level approach for synchronization Packet syn. through PHY preamble Intra-group syn. through beaconing algorithm Inter-group (global) syn. through GPS Lothar Stibor, Philips Lothar Stibor, Philips

Challenges of VWMN MAC (2/2) January 2006 doc.: IEEE 802.15- 15-06-0020-00-wng0 January 2006 Challenges of VWMN MAC (2/2) Dynamic topology control / mobility management in VWMN Beacon collision probability raises in high mobility environment Proposed solutions Multiple beacon periods for groups of vehicles with high relative speed Reduces beacon slot contention Prevent synchronization between unlikely communication partners Transmission power control limits the number of vehicles contenting for the same beacon period 125m for 18 superframes(50ms) @ 500km/h Lothar Stibor, Philips Lothar Stibor, Philips

January 2006 Conclusion & Outlook A synchronized and distributed VWMN MAC is proposed for mobile media applications Synchronization and distributed topology control are essential issues Feedback from 802.15 is highly appreciated Does the concept fit into WPAN? Is high mobility a topic 802.15 will address? Lothar Stibor, Philips

doc.: IEEE 802.15- 15-06-0020-00-wng0 January 2006 January 2006 Lothar Stibor, Philips Lothar Stibor, Philips