Context-Aware Navigator Protocol for IP-Based Vehicular Networks
draft-jeong-ipwave-context-aware-navigator-01

Abstract

This document proposes a Context-Aware Navigator Protocol (CAN) for IP-based vehicular networks for cooperative navigation among vehicles in road networks. This CAN aims at the enhancement of driving safety through a light-weight driving information sharing method. The CAN protocol uses an IPv6 Neighbor Discovery (ND) option to convey driving information such as a vehicle's position, speed, acceleration/deceleration, and direction, and a driver's driving action (e.g., braking and accelerating).

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Table of Contents

• 1. Introduction
• 2. Requirements Language
• 3. Terminology
• 4. Vehicle Mobility Information Option
• 5. Security Considerations
• 6. Acknowledgments
• 7. References
• 7.1. Normative References
• 7.2. Informative References
• Appendix A. Changes from draft-jeong-ipwave-context-aware-navigator-00
• Authors' Addresses

1. Introduction

The enhancement of driving safety is one of objectives in cooperative driving in vehicular networks. Dedicated Short-Range Communications (DSRC) is for vehicular communications [DSRC]. IEEE has standardized a family standard suite of Wireless Access in Vehicular Environments (WAVE) [WAVE]. Also, IETF has standardized an IPv6 packet delivery protocol over IEEE 802.11-OCB (Outside the Context of a Basic Service Set) [RFC8691], which is a MAC protocol for vehicles in WAVE.

A vehicle equipped with various sensors and the a DSRC device can sense its surrounding environment including its neighboring vehicles, and share the sensed data and its mobility information (e.g., position, speed, acceleration/deceleration, and direction) with its neighboring vehicles. This information sharing allows vehicles to assess the collision risk and make their maneuver change to avoid an accident in a prompt way. That is, the capability of sensing, computing, and communication of vehicles enables them to understand the driving environment and situation (i.e., context), and cooperate with each other during their navigation.

The driving information sharing enables Context-Aware Navigator (CAN) where each vehicle can display its neighboring vehicles, pedestrians, and obstacles in its navigation system [CASD]. With this CAN, a driver can make a better decision on driving to avoid an accident, and an autonomous vehicle can control its maneuver to escape from a possible fatality in advance.

For this CAN service, this document proposes a light-weight data sharing protocol using a new IPv6 Neighbor Discovery (ND) option for Vehicle Mobility Information, which is called Vehicle Mobility Information (VMI) option. This VMI option can be included by a Neighbor Advertisement (NA) message in Vehicular Neighbor Discovery (VND) [ID-Vehicular-ND].

There are two messages for the CAN service with the VMI option such as Cooperation Context Message (CCM) and Emergency Context Message (ECM). The CCM is a message to deliver a vehicle's motion information (e.g., position, speed, acceleration/deceleration, direction) and a driver's driving action (e.g., braking and accelerating) to its neighboring vehicles for cooperative driving. The ECM is a message to notify a vehicle's neighboring vehicles of an emergency situation (e.g., an accident and dangerous situation). The ECM has a higher priority than the CCM such that the ECM needs to be disseminated faster than the CCM in vehicular networks.

2. Requirements Language

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119].

3. Terminology

This document uses the terminology described in [ID-IPWAVE-PS].

4. Vehicle Mobility Information Option

Vehicle Mobility Information (VMI) option is an IPv6 ND option to convey either a CCM or ECM. Figure 1 shows the format of the VMI option.

   0                   1                   2                   3  
   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1  
  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  |     Type      |    Length     |    Message    |  Reserved1    |
  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  |                           Reserved2                           |
  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  |                                                               |
  :                      Mobility Information                     :
  |                                                               |   
  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
            

Figure 1: Vehicle Mobility Information (VMI) Option Format

Fields:
 Type           8-bit identifier of the VMI option type as assigned
                by the IANA: TBD

 Length         8-bit unsigned integer.  The length of the option
                (including the Type and Length fields) is in units of
                8 octets.  The value is 3.
				
 Message        8-bit identifier of the VMI message type as CCM (0) 
                and ECM (1). 
 
 Reserved1      This field is unused.  It MUST be initialized to
                zero by the sender and MUST be ignored by the
                receiver.

 Reserved2      This field is unused.  It MUST be initialized to
                zero by the sender and MUST be ignored by the
                receiver.

 Mobility Information
                128-bit mobility information.  It contains a vehicle's
                motion information (e.g., position, speed, 
                acceleration/deceleration, direction) and a driver's 
                driving action (e.g., braking and accelerating) for 
                CCM.  Also, it contains a vehicle's emergency 
                information (e.g., obstacle information and accident
                information).                  					
            

A CCM in a VMI option can be included in an NA message that a vehicle transmits periodically to announce its existence and routing information to its one-hop neighboring vehicles [ID-Vehicular-ND].

An ECM in a VMI option can be included in an NA message that a vehicle transmits to immediately announce an emergency situation to its one-hop neighboring vehicles [ID-Vehicular-ND].

To let the vehicles take an immediate action on an emergency situation, the ECM has a higher priority than the CCM. Thus, if a vehicle has an ECM and a CCM to send, it SHOULD transmit the ECM earlier than the CCM.

5. Security Considerations

This document shares all the security issues of the IPv6 ND protocol. This document can get benefits from Secure Neighbor Discovery (SEND) [RFC3971] in order to protect exchanged messages from possible security attacks.

6. Acknowledgments

This work was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2017R1D1A1B03035885).

This work was supported in part by Institute of Information & Communications Technology Planning & Evaluation (IITP) grant funded by the Korea MSIT (Ministry of Science and ICT) (R-20160222-002755, Cloud based Security Intelligence Technology Development for the Customized Security Service Provisioning).

This work was supported in part by the MSIT under the ITRC (Information Technology Research Center) support program (IITP-2019-2017-0-01633) supervised by the IITP.

7. References

7.1. Normative References

7.2. Informative References

Appendix A. Changes from draft-jeong-ipwave-context-aware-navigator-00

The following changes are made from draft-jeong-ipwave-context-aware-navigator-00:

• This version has a submission date update to maintain the active status of the draft.
• This version updates the version numbers of the referenced drafts.

Authors' Addresses