Internet DRAFT - draft-chen-lwip-rd-mg
draft-chen-lwip-rd-mg
Internet Engineering Task Force G. Chen
Internet-Draft T. Sun
Intended status: Informational China Mobile
Expires: April 21, 2011 October 18, 2010
Rapid Deployment of Lightweight IP Technologies on Mobile Gateways
draft-chen-lwip-rd-mg-00
Abstract
This memo presents an SD-based mobile gateway to wireless sensor
network (WSN), which aims at helping users with mobile terminals to
access WSN conveniently and efficiently.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Lightweight SD Design . . . . . . . . . . . . . . . . . . . . . 3
3. Lightweight SD Usage Model . . . . . . . . . . . . . . . . . . 5
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
5. Security Considerations . . . . . . . . . . . . . . . . . . . . 5
6. Informative References . . . . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 5
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1. Introduction
The combination of cellular network and wireless sensor networks
(WSN) [WSN] gives birth to mobile wireless sensor networks (mWSN).
mWSN can not only bring cellular network with new applications and
services, but also bring WSN with more users and flexible long-
distance communication. However, the communication protocols in WSN
are usually designed according to specific applications, not unified.
It leads to the fact that mobile terminals cannot be equipped with
all relevant transceivers in advance. Meanwhile, there are numerous
kinds of mobile terminals with heterogeneous platforms. It is so
difficult for developers to design universal expansion hardware to
help mobile terminals access WSN.
Considering the situation discussed above, this memo has designed a
novel mobile gateway, which helps to address the problem of mobile
terminal accessing WSN. The mechanical dimensions are completely
same as normal SD Memory Card, but it integrates a communication
module. It's most significant characteristic is its platform-
independence. In the eyes of Host, lightweight SD makes no
difference with a normal SD Memory Card. However, uSD translates the
normal SD Memory Card file access commands (from Host) into the
operations of communication module on it, and returns the operation
results (to Host) in the form of file access results. Due to the
fact that the SD slot of any hardware platform supports SD Memory
Card and file operation, lightweight SD is assured to be compatible
with all of them.
2. Lightweight SD Design
Digital electronic devices with an expansion SD Card slot at least
support the expansion of storage capacity, and files in normal SD
Memory Card can be directly operated by heterogeneous platforms.
Hence the plug-and-play quality of normal SD Memory Card has already
been realized regardless of the low-level details of these files
operations.
Based on this normal SD Memory Card!_s plug-and-play quality, we
advance a novel hardware expansion method only via lightweight IP
file operations, as Figure 1 shows.
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+---------------------------------------+
| Special Application OS-Independent |
+---------------------------------------+
|
+---------------------------------------+
| Lightweight IP File System |
+---------------------------------------+
|
+---------------------------------------+
| SD Memory Card Driver |
+---------------------------------------+
(software-hardware interface)
|
+---------------------------------------+
| SD Hardware |
+---------------------------------------+
Figure 1
Through SD Memory Card Interface, Lightweight SD pretend to be a
normal SD Memory Card and Host can directly access files in
Lightweight SD!_s memory through File System. Some special virtual
files are stored in Lightweight SD in advance, in which
"Dvirtual![not] means we format the memory of Lightweight SD with
special File System instead of Host formatting it. The FAT Region of
this special File System has been modified and some virtual files are
registered there. These virtual files are just the vehicle of
communication between Lightweight SD and Host. According to
different functions, virtual files in memory are categorized into
different groups, such as files for responding from RF, files for
controlling RF.
Once the RF Chips in Lightweight SD wants to inform Host with some
new information, Lightweight SD would put the information into a FIFO
in it. When Host needs new response, it will access thevirtual files
for responding through the Special Application and Lightweight SD
will respond to Host with the new information in FIFO. Finally the
new information will be displayed in Host!_s user interface. If Host
intends to execute some control on the RF, it will access the
corresponding virtual files for controlling through the Special
Application, the process of which will be detected and executed by
Lightweight SD. Special Application refers to the special purpose
programs and applications, which are specially written for the RF and
with such platform-independent language like Python or Java. Those
platform-independent languages supply API of file operation;
meanwhile, data interaction between Lightweight SD and Host only
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needs upper-level file operations. Therefore, Lightweight SD truly
accomplishes platform independence in terms of both hardware and
software.
3. Lightweight SD Usage Model
The combination of Lightweight SD and users!_ portal devices or home
appliances can help to build a WPAN with high performance, which
makes the efficient private communication and activity more
convenient and is also a supplement to WPAN. Home networking is one
important branch of WPAN, and the following context displays
Lightweight SD!_s applications in home networking.
With Lightweight SD, users!_ terminals will become the home gateway,.
Considering most home appliances are control via infrared,
Lightweight SD!_s RF part should be customized as infrared chips.
Additionally, terminals with Lightweight SD can receive the
environment parameters through the sensors of temperature and
brightness placed around the house. In turn, the auto-control
application in the terminal can adjust air-conditions and lights in
the house respectively according to these environment parameters via
Lightweight SD. Furthermore, Lightweight SD also can be competent
for home security supervising through accessing the wireless sensors
and cameras in the house.
4. IANA Considerations
This memo includes no request to IANA.
5. Security Considerations
It needs to be further identified.
6. Informative References
[WSN] Chen, C., "Mobile Enabled Large Scale Wireless Sensor Networks
Advanced Communication Technology", ICACT , March 2006.
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Authors' Addresses
Gang Chen
China Mobile
53A,Xibianmennei Ave.,
Xuanwu District,
Beijing 100053
China
Email: chengang@chinamobile.com
Tao Sun
China Mobile
53A,Xibianmennei Ave.,
Xuanwu District,
Beijing 100053
China
Email: suntao@chinamobile.com
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