IPWAVE Working Group J. Jeong
Internet-Draft Y. Shen
Intended status: Standards Track Z. Xiang
Expires: September 29, 2019 Sungkyunkwan University
March 28, 2019
Vehicular Mobility Management for IP-Based Vehicular Networks
draft-jeong-ipwave-vehicular-mobility-management-00
Abstract
This document specifies a vehicular mobility management scheme for
IP-based vehicular networks. The vehicular mobility management
scheme takes advantage of a vehicular link model based on a multi-
link subnet. With a vehicle's mobility information (e.g., position,
speed, and direction) and navigation path (i.e., trajectory), it can
provide a moving vehicle with proactive and seamless handoff along
with its trajectory.
Status of This Memo
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Requirements Language . . . . . . . . . . . . . . . . . . . . 3
3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Vehicular Network Architecture . . . . . . . . . . . . . . . 4
4.1. Vehicular Network . . . . . . . . . . . . . . . . . . . . 4
5. Mobility Management . . . . . . . . . . . . . . . . . . . . . 6
5.1. Network Attachment of a Vehicle . . . . . . . . . . . . . 6
5.2. Handoff within One Prefix Domain . . . . . . . . . . . . 8
5.3. Handoff between Multiple Prefix Domains . . . . . . . . . 10
6. Security Considerations . . . . . . . . . . . . . . . . . . . 12
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
7.1. Normative References . . . . . . . . . . . . . . . . . . 12
7.2. Informative References . . . . . . . . . . . . . . . . . 12
Appendix A. Acknowledgments . . . . . . . . . . . . . . . . . . 14
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 14
1. Introduction
This document proposes a mobility management scheme for IP-based
vehicular networks, which is called vehicular mobility management
(VMM). This vehicular mobility management is tailored for a
vehicular network architecture and a vehicular link model described
in IPWAVE problem statement document [I-D.IPWAVE-PS].
To support the interaction between vehicles or between vehicles and
Rode-Side Units (RSUs), Vehicular Neighbor Discovery (VND) is
proposed as an enhanced IPv6 Neighbor Discovery (ND) for IP-based
vehicular networks [I-D.IPWAVE-VND]. For an efficient IPv6 Stateless
Address Autoconfiguration (SLAAC) [RFC4862], VND adopts an optimized
Address Registration using a multihop Duplicate Address Detection
(DAD). This multihop DAD enables a vehicle to have a unique IP
address in a multi-link subnet that consists of multiple wireless
subnets with the same IP prefix, which corresponds to wireless
coverage of multiple Road-Side Units (RSUs). Also, VND supports IP
packet routing via a connected Vehicular Ad Hoc Network (VANET) by
letting vehicles exchange the prefixes of their internal networks
through their external wireless interface.
The mobility management in this multi-link subnet needs a new
approach from the legacy mobility management schemes. This document
aims at an efficient mobility management scheme called vehicular
mobility management called VMM to support efficient V2V, V2I, and V2X
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communications in a road network. The VMM takes advantage of the
mobility information (e.g., a vehicle's speed, direction, and
position) and trajectory (i.e., navigation path) of each vehicle
registered into a Traffic Control Center (TCC) in the vehicular
cloud.
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 [RFC4861] and
[RFC4862]. In addition, the following new terms are defined as
below:
o DMM: Acronym for "Distributed Mobility Management"
[RFC7333][RFC7429].
o Mobility Anchor (MA): A node that maintains IP addresses and
mobility information of vehicles in a road network to support
their address autoconfiguration and mobility management with a
binding table. It has end-to-end connections with RSUs under its
control.
o On-Board Unit (OBU): A node that has a network interface (e.g.,
IEEE 802.11-OCB and Cellular V2X (C-V2X) [TS-23.285-3GPP]) for
wireless communications with other OBUs and RSUs, and may be
connected to in-vehicle devices or networks. An OBU is mounted on
a vehicle. It is assumed that a radio navigation receiver (e.g.,
Global Positioning System (GPS)) is included in a vehicle with an
OBU for efficient navigation.
o OCB: Acronym for "Outside the Context of a Basic Service Set"
[IEEE-802.11-OCB].
o Road-Side Unit (RSU): A node that has physical communication
devices (e.g., IEEE 802.11-OCB and C-V2X) for wireless
communications with vehicles and is also connected to the Internet
as a router or switch for packet forwarding. An RSU is typically
deployed on the road infrastructure, either at an intersection or
in a road segment, but may also be located in car parking areas.
o Traffic Control Center (TCC): A node that maintains road
infrastructure information (e.g., RSUs, traffic signals, and loop
detectors), vehicular traffic statistics (e.g., average vehicle
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speed and vehicle inter-arrival time per road segment), and
vehicle information (e.g., a vehicle's identifier, position,
direction, speed, and trajectory as a navigation path). TCC is
included in a vehicular cloud for vehicular networks.
o Vehicular Cloud: A cloud infrastructure for vehicular networks,
having compute nodes, storage nodes, and network nodes.
o WAVE: Acronym for "Wireless Access in Vehicular Environments"
[WAVE-1609.0].
4. Vehicular Network Architecture
This section describes a vehicular network architecture for V2V and
V2I communication. A vehicle and an RSU have their internal networks
including in-vehicle devices or servers, respectively.
4.1. Vehicular Network
A vehicular network architecture for V2I and V2V is illustrated in
Figure 1. In this figure, there is a vehicular cloud having a
Traffic Control Center (TCC). The TCC has Mobility Anchors (MAs) for
the mobility management of vehicles under its control. Each MA is in
charge of the mobility management of vehicles under its prefix
domain, which is a multi-link subnet of RSUs sharing the same prefix
[I-D.IPWAVE-PS]. A vehicular network is a wireless network
consisting of RSUs and vehicles. RSUs are interconnected with each
other through a wired network, and vehicles can construct Vehicular
Ad Hoc Networks (VANET).
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*-----------------------------------------*
* TCC in Vehicular Cloud *
* +-------------------------------------+ *
+--------+ * | +---------+ +---------+ | *
| CN1 |<---->* | | MA1 |<------->| MA2 | | *
+--------+ * | +---------+ +---------+ | *
* +-------------------------------------+ *
* ^ ^ *
* | INTERNET | *
*---------v--------------------v----------*
^ ^ ^
| Ethernet | |
| | |
v v v
+--------+ Ethernet +--------+ Ethernet +--------+
| RSU1 |<-------->| RSU2 |<-------->| RSU3 |
+--------+ +--------+ +--------+
^ ^ ^
: : :
+-----------------------------------+ +-----------------+
| : V2I V2I : | | V2I : |
| v v | | v |
+--------+ | +--------+ +--------+ | | +--------+ |
|Vehicle1|======>|Vehicle2|======>|Vehicle3|====>| | |Vehicle4|====>|
| |<.....>| |<.....>| | | | | | |
+--------+ V2V +--------+ V2V +--------+ | | +--------+ |
| | | |
+-----------------------------------+ +-----------------+
Subnet1 Subnet2
<----> Wired Link <....> Wireless Link ===> Moving Direction
Figure 1: A Vehicular Network Architecture for V2I and V2V Networking
In Figure 1, three RSUs are deployed either at intersections or along
roadways. They are connected to an MA through wired networks. In
the vehicular network, there are two subnets such as Subnet1 and
Subnet2. Subnet1 is a multi-link subnet consisting of multiple
wireless coverage areas of multiple RSUs, and those areas share the
same IPv6 prefix to construct a single logical subnet
[I-D.IPWAVE-PS]. That is, the wireless links of RSU1 and RSU2 belong
to Subnet1. Thus, since Vehicle2 and Vehicle2 use the same prefix
for Subnet1 and they are within the wireless communication range,
they can communicate directly with each other. Note that in a multi-
link subnet, a vehicle (e.g., Vehicle1 and Vehicle2 in Figure 1) can
configure its global IPv6 address through an address registration
procedure including a multihop Duplicate Address Detection (DAD),
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which is specified in Vehicular Neighbor Discovery (VND)
[I-D.IPWAVE-VND].
On the other hand, Subnet2 uses a prefix different from Subnet1's.
Vehicle4 residing in Subnet2 cannot talk to Vehicle3 directly because
they belong to different subnets. Vehicles can construct a connected
VANET, so they can communicate with each other without the relaying
of an RSU, but the forwarding over the VANET. In the case where two
vehicles belong to the same multi-link subnet, but they are not
connected in the same VANET, they can use RSUs. In Figure 1, even
though Vehicle2 are disconnected from Vehicle3, they can communicate
indirectly with each other through RSUs such as RSU1 and RSU2.
In Figure 1, it is assumed that Vehicle2 communicates with the
corresponding node denoted as CN1 where Vehicle2 is moving in the
wireless coverage of RSU1. When Vehicle2 moves out of the coverage
of RSU1 and moves into the coverage of RSU2 where RSU1 and RSU2
shares the same prefix, the packets sent by CN1 should be routed
toward Vehicle2. Also, when Vehicle2 moves out of the coverage of
RSU2 and moves into the coverage of RSU3 where RSU2 and RSU3 use two
different prefixes, the packets of CN1 should be delivered to
Vehicle2. With a handoff procedure, a sender's packets can be
delivered to a destination vehicle which the destination vehicle is
moving in the wireless coverage areas. Thus, this document specifies
a mobility management scheme in the vehicular network architecture,
as shown in Figure 1.
5. Mobility Management
This section explains the detailed procedure of mobility management
of a vehicle in a vehicular network as shown in Figure 1.
5.1. Network Attachment of a Vehicle
A mobility management is required for the seamless communication of
vehicles moving between the RSUs. When a vehicle moves into the
coverage of another RSU, a different IP address is assigned to the
vehicle, resulting in the reconfiguration of transport-layer session
information (i.e., an end-point's IP address) to avoid service
disruption. Considering this issue, this document proposes a handoff
mechanism for seamless communication.
In [VIP-WAVE], the authors constructed a network-based mobility
management scheme using Proxy Mobile IPv6 (PMIPv6) [RFC5213], which
is highly suitable to vehicular networks. This document uses a
mobility management procedure similar to PMIPv6 along with prefix
discovery.
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Vehicle RSU Mobility Anchor
| | |
|-RS with Mobility Info->| |
| [VMI] | |
| | |
| |--------PBU------>|
| | |
| | |
| |<-------PBA-------|
| | |
| | |
| |===Bi-Dir Tunnel==|
| | |
| | |
|<----RA with prefix-----| |
| | |
Figure 2: Message Interaction for a Vehicle's Network Attachment
Figure 2 shows the binding update flow when a vehicle entered the
subnet of an RSU. RSUs act as Mobility Anchor Gateway (MAG) defined
in [VIP-WAVE]. When it receives an RS message from a vehicle
containing its mobility information (e.g., position, speed, and
direction), an RSU sends its MA a Proxy Binding Update (PBU) message
[RFC5213][RFC3775], which contains a Mobility Option for the
vehicle's mobility information. The MA receives the PBU and sets up
a Binding Cache Entry (BCE) as well as a bi-directional tunnel
(denoted as Bi-Dir Tunnel in Figure 2) between the serving RSU and
itself. Through this tunnel, all traffic packets to the vehicle are
encapsulated toward the RSU. Simultaneously, the MA sends back a
Proxy Binding Acknowledgment (PBA) message to the serving RSU. This
serving RSU receives the PBA and sets up a bi-directional tunnel with
the MA. After this binding update, the RSU sends back an RA message
to the vehicle, which includes the RSU's prefix for the address
autoconfiguration of the vehicle.
When the vehicle receives the RA message, it performs the address
registration procedure including a multihop DAD for its global IP
address based on the prefix announced by the RA message according to
the VND [I-D.IPWAVE-VND].
In PMIPv6, a unique prefix is allocated to each vehicle by an MA
(i.e., LMA), but in this document, a unique IP address is allocated
to each vehicle by an MA through the multihop-DAD-based address
registration. This unique IP address allocation can reduce the waste
of IP prefixes by the legacy PMIPv6 because vehicles in a multi-link
is allocated with a unique IP address based on the same prefix.
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5.2. Handoff within One Prefix Domain
When the vehicle changes its location and its current RSU (denoted as
c-RSU) detects that the vehicles moves out of its coverage, c-RSU
needs to report the movement of the vehicle into the coverage of
another RSU to the MA.
Vehicle c-RSU Mobility Anchor n-RSU
| | | |
| |===Bi-Dir Tunnel==| |
| | | |
| | | |
| |----DeReg PBU---->| |
| | | |
| | | |
| |<-------PBA-------| |
| | | |
| | | |
| | | |
| | | |
| | | |
|(------------------RS with Mobility Info-------------->)|
| [VMI] | |
| |<-------PBU-------|
| | |
| | |
| |--------PBA------>|
| | |
| | |
| |===Bi-Dir Tunnel==|
| | |
| | |
|<--------------------RA with prefix---------------------|
| |
Figure 3: Handoff of a Vehicle within One Prefix Domain with PMIPv6
With this report, the MA can change the end-point of the tunnel for
the vehicle into the new RSU's IP address.
Figure 3 shows the handoff of a vehicle within one prefix domain
(i.e., a multi-link subnet) with PMIPv6. As shown in the figure,
when the MA receives a new PBU from the new RSU, it changes the
tunnel's end-point from the current RSU (c-RSU) to the new RSU
(n-RSU). If there is ongoing IP packets toward the vehicle, the MA
encapsulates the packets and then forwards them towards n-RSU.
Through this network-based mobility management, the vehicle is not
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aware of any changes at its network layer and can maintain its
transport-layer sessions without any disruption.
Vehicle c-RSU n-RSU
| | |
|---------------------| |
|c-RSU detects leaving| |
|---------------------| |
| |--------PBU------>|
| | |
| |===Bi-Dir Tunnel==|
| | |
| |<-------PBA-------|
| | |
| | |
|(--------RS with Mobility Info-------->)|
| [VMI] |
| |
|<------------RA with prefix-------------|
| |
Figure 4: Handoff of a Vehicle within One Prefix Domain with DMM
If c-RSU and n-RSU are adjacent, that is, vehicles are moving in
specified routes with fixed RSU allocation, the procedure can be
simplified by constructing bidirectional tunnel directly between them
(cancel the intervention of MA) to alleviate the traffic flow in MA
as well as reduce handoff delay.
Figure 4 shows the handoff of a vehicle within one prefix domain (as
a multi-link subnet) with DMM [I-D.DMM-PMIPv6]. RSUs are in charge
of detecting when a node joins or moves through its domain. If c-RSU
detects that the vehicle is going to leave its coverage and to enter
the area of an adjacent RSU, it sends a PBU message to inform n-RSU
of the handoff of vehicle. If n-RSU receives the PBU message, it
constructs a bidirectional tunnel between c-RSU and itself, and then
sends back a PBA message as an acknowledgment to c-RSU. If there are
ongoing IP packets toward the vehicle, c-RSU encapsulates the packets
and then forwards them to n-RSU. When n-RSU detects the entrance of
the vehicle, it directly sends an RA message to the vehicle so that
the vehicle can assure that it is still connected to a router for its
current prefix. If the vehicle sends an RS message to n-RSU, n-RSU
responds to the RA message by sending an RA to the vehicle.
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5.3. Handoff between Multiple Prefix Domains
When the vehicle moves from a prefix domain to another prefix domain,
a handoff between multiple prefix domains is required. As shown in
Figure 1, when Vehicle3 moves from the subnet of RSU2 (i.e., Subnet1)
to the subnet of RSU3 (i.e., Subnet2), a multiple domain handoff is
performed through the cooperation of RSU2, RSU3, MA1 and MA2.
Vehicle c-RSU MA1 MA2 n-RSU
| | | | |
| |==Bi-Dir Tunnel==| | |
| | | | |
| | | | |
| |---DeReg PBU---->| | |
| | |-------PBU----->| |
| | | | |
| |<------PBA-------| |-------PBA------>|
| | | | |
| | | |==Bi-Dir Tunnel==|
| | | | |
| | | | |
|(----------------------RS with Mobility Info------------------->)|
| | |[VMI] | |
| | | | |
| | | | |
|<----------------------RA with prefix1 (c-RSU)-------------------|
| | | | |
|<----------------------RA with prefix2 (n-RSU)-------------------|
| | | | |
Figure 5: Handoff of a Vehicle between Multiple Prefix Domains with
PMIPv6
Figure 5 shows the handoff of a vehicle between two prefix domains
(i.e., two multi-link subnets) with PMIPv6. When the vehicle moves
out of its current RSU (denoted as c-RSU) belonging to Subnet1, and
moves into the next RSU (n-RSU) belonging to Subnet2, c-RSU detects
that the vehicles moves out of its coverage. c-RSU reports the
movement of the vehicle into the coverage of another RSU (n-RSU) to
MA1. MA1 sends MA2 a PBU message to inform MA2 that the vehicle will
enter the coverage of n-RSU belonging to MA2. MA2 send n-RSU a PBA
message to inform n-RSU that the vehicle will enter the coverage of
n-RSU along with handoff context such as c-RSU's context information
(e.g., c-RSU's link-local address and prefix called prefix1), and the
vehicle's context information (e.g., the vehicle's global IP address
and MAC address). After n-RSU receives the PBA message including the
handoff context from MA2, it sets up a bi-directional tunnel with
MA2, and generates RA messages with c-RSU's context information.
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That is, n-RSU pretents to be a router belonging to Subnet1. When
the vehicle receives the RA from n-RSU, it can maintain its
connection with its corresponding node (i.e., CN1). Note that n-RSU
also sends RA messages with its domain prefix called prefix2. The
vehicle configures another global IP address with prefix2, and can
use it for the communication with neighboring vehicles under the
coverage of n-RSU.
If c-RSU and n-RSU are adjacent, that is, vehicles are moving in
specified routes with fixed RSU allocation, the procedure can be
simplified by constructing bidirectional tunnel directly between them
(cancel the intervention of MA) to alleviate the traffic flow in MA
as well as reduce handoff delay.
Vehicle c-RSU n-RSU
| | |
|---------------------| |
|c-RSU detects leaving| |
|---------------------| |
| |--------PBU------>|
| | |
| |===Bi-Dir Tunnel==|
| | |
| |<-------PBA-------|
| | |
| | |
|(--------RS with Mobility Info-------->)|
| [VMI] |
| |
|<--------RA with prefix1 (c-RSU)--------|
| |
|<--------RA with prefix2 (n-RSU)--------|
| |
Figure 6: Handoff of a Vehicle within Multiple Prefix Domains with
DMM
Figure 6 shows the handoff of a vehicle within two prefix domains (as
two multi-link subnets) with DMM [I-D.DMM-PMIPv6]. If c-RSU detects
that the vehicle is going to leave its coverage and to enter the area
of an adjacent RSU (n-RSU) belonging to a different prefix domain, it
sends a PBU message to inform n-RSU that the vehicle will enter the
coverage of n-RSU along with handoff context such as c-RSU's context
information (e.g., c-RSU's link-local address and prefix called
prefix1), and the vehicle's context information (e.g., the vehicle's
global IP address and MAC address). After n-RSU receives the PBA
message including the handoff context from c-RSU, it sets up a bi-
directional tunnel with c-RSU, and generates RA messages with c-RSU's
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context information. That is, n-RSU pretends to be a router
belonging to Subnet1. When the vehicle receives the RA from n-RSU,
it can maintain its connection with its corresponding node (i.e.,
CN1). Note that n-RSU also sends RA messages with its domain prefix
called prefix2. The vehicle configures another global IP address
with prefix2, and can use it for the communication with neighboring
vehicles under the coverage of n-RSU.
6. Security Considerations
This document shares all the security issues of Vehicular ND
[I-D.IPWAVE-VND], Proxy MIPv6 [RFC5213], and DMM
[RFC7333][RFC7429][I-D.DMM-PMIPv6].
7. References
7.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3775] Johnson, D., Perkins, C., and J. Arkko, "Mobility Support
in IPv6", RFC 3775, June 2004.
[RFC4861] Narten, T., Nordmark, E., Simpson, W., and H. Soliman,
"Neighbor Discovery for IP Version 6 (IPv6)", RFC 4861,
September 2007.
[RFC4862] Thomson, S., Narten, T., and T. Jinmei, "IPv6 Stateless
Address Autoconfiguration", RFC 4862, September 2007.
[RFC5213] Gundavelli, S., Leung, K., Devarapalli, V., and K.
Chowdhury, "Proxy Mobile IPv6", RFC 5213, August 2008.
[RFC7333] Chan, H., Liu, D., Seite, P., Yokota, H., and J. Korhonen,
"Requirements for Distributed Mobility Management",
RFC 7333, August 2014.
[RFC7429] Liu, D., Zuniga, JC., Seite, P., Chan, H., and CJ.
Bernardos, "Distributed Mobility Management: Current
Practices and Gap Analysis", RFC 7429, January 2015.
7.2. Informative References
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[I-D.DMM-PMIPv6]
Bernardos, CJ., Oliva, A., Giust, F., Zuniga, JC., and A.
Mourad, "Proxy Mobile IPv6 extensions for Distributed
Mobility Management", draft-ietf-dmm-pmipv6-dlif-04 (work
in progress), January 2019.
[I-D.IPWAVE-PS]
Jeong, J., Ed., "IP Wireless Access in Vehicular
Environments (IPWAVE): Problem Statement and Use Cases",
draft-ietf-ipwave-vehicular-networking-08 (work in
progress), March 2019.
[I-D.IPWAVE-VND]
Jeong, J., Ed., Shen, Y., and Z. Xiang, "IPv6 Neighbor
Discovery for IP-Based Vehicular Networks", draft-jeong-
ipwave-vehicular-neighbor-discovery-06 (work in progress),
March 2019.
[IEEE-802.11-OCB]
"Part 11: Wireless LAN Medium Access Control (MAC) and
Physical Layer (PHY) Specifications", IEEE Std
802.11-2016, December 2016.
[TS-23.285-3GPP]
3GPP, "Architecture Enhancements for V2X Services", 3GPP
TS 23.285, June 2018.
[VIP-WAVE]
Cespedes, S., Lu, N., and X. Shen, "VIP-WAVE: On the
Feasibility of IP Communications in 802.11p Vehicular
Networks", IEEE Transactions on Intelligent Transportation
Systems, vol. 14, no. 1, March 2013.
[WAVE-1609.0]
IEEE 1609 Working Group, "IEEE Guide for Wireless Access
in Vehicular Environments (WAVE) - Architecture", IEEE Std
1609.0-2013, March 2014.
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Appendix A. 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).
Authors' Addresses
Jaehoon Paul Jeong
Department of Software
Sungkyunkwan University
2066 Seobu-Ro, Jangan-Gu
Suwon, Gyeonggi-Do 16419
Republic of Korea
Phone: +82 31 299 4957
Fax: +82 31 290 7996
EMail: pauljeong@skku.edu
URI: http://iotlab.skku.edu/people-jaehoon-jeong.php
Yiwen Chris Shen
Department of Electrical and Computer Engineering
Sungkyunkwan University
2066 Seobu-Ro, Jangan-Gu
Suwon, Gyeonggi-Do 16419
Republic of Korea
Phone: +82 31 299 4106
Fax: +82 31 290 7996
EMail: chrisshen@skku.edu
Zhong Xiang
Department of Electrical and Computer Engineering
Sungkyunkwan University
2066 Seobu-Ro, Jangan-Gu
Suwon, Gyeonggi-Do 16419
Republic of Korea
Phone: +82 10 9895 1211
Fax: +82 31 290 7996
EMail: xz618@skku.edu
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