5 Ubiquitous Network

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Implementation of a Cable

Access Point Device forUbiquitousNetwork Applications



By.

P. Victer Paul

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ABSTRACT

This paper presents theimplementation of a low-cost, dataaccess-efficient, sample and easy todeployment, waterproof, andheatproof outdoor Cable Access Point

(CAP) device for ubiquitous networkapplications.



ABSTRACT (cont.)

The main purpose of the CAP deviceis to effectively extend the coverageof outdoor wireless access link and tofurther provide a data access-efficientservice for construction of a

ubiquitous networking environment inthe metropolitan area.



ABSTRACT (cont.)

Besides, to ensure the safety andvalidity for data accessing and

information exchanging in thewireless broadband network, asecurity certifying mechanism of

authentication, authorization, andaccounting (AAA) is also integrated inthe CAP device.



Architecture of CAP device.

Figure 1:The system architecture of the proposed CAP device.



WHY CABLE ACCESS POINT

The requirement for the networkaccessing service has expanded fromthe indoor area to the outdoor

environment, so as to support bettercoverage of network accessing areasand to provide more efficient and

convenient data access link servicesfor people to support ubiquitousnetwork applications.



WHY CAP (cont.)

It is Hard to maintain the overallsignal quality in a large transmissionrange in outdoor environment.

On the other hand, the securitycertifying mechanism of

authentication, authorization, andaccounting (AAA) in wirelessnetworks is also an important issue



APPLICATION SCENARIO OFCAP DEVICES

Fig. 2. The CAP-based ubiquitous network architecture.



SYSTEM FUNCTIONS OF CAPDEVICES

Fig. 3. The function block diagram of CAP devices.




1) Packet forwarder: It is responsible forforwarding the packet and is able to controlthe data transmission flow.

2) Policy routing engine: Routing rules inthis engine decide whether any packet, thatenters the CAP device and is authenticated

by the extensible authentication protocol(EAP) module and the AAA-client module,can be forwarded or not.




3) AP management module: it isthe management core for the wholeCAP control and operation.

4) AAA-client module: In responseto the AAA server on the CATV head-

end, it provides authentication andauthorization services for users andavoid illegal packets to occupy datapaths between CMTS and CAP.




5 ) Packet inspector: It offers amanagement tool for monitoring andcontrolling data flow of all packets thatenters the CAP.

6) Basic Internet services: It providesthe HTTP proxy service and issues dynamicIP addresses for users.

7) Light weight Web server: The CAPmust have built-in capability as a Webserver with an intrinsic homepage to enablefirst time users to register.




8) Watchdog and monitoring module: Itis used to monitor the condition of connection from the user and to determinewhether the user is still on-line based on

the access continuity or termination so asto charge the user accordingly.

9) SNMP agent: The CAP provides networkmanagement capability. Through simple

network management protocol (SNMP)command, the CAP can access itsmanagement information base (MIB)parameters to figure out whether thedevice works normally.




10) PPTP/IPSEC engine: The CAPsupports point-to-point tunneling protocol(PPTP) to allow every node in the WLAN to

connect with each other through Internet.Following Internet protocol security (IPSEC)communication protocol, the operationsystem could provide packet encryption

service for safe communication requirementamong the application softwares to furtherensure the confidentiality, integrity, andreliability of all data.



AAA-CLIENT MECHANISM

The AAA service consists of asubscriber database and a server thathas authentication and authorization

functions.

It is responsible for the processing of

user identification (ID) verificationand access permission according tothe database.




Fig. 4. Proposed flowchart of AAA-clientmechanism in the CAP device.




After receiving an 802.11 packet, the CAPdevice extracts the MAC address from thepacket and compares it with the EAP-verified MAC table.

If there is a match, then the packetcomplies with 802.1x EAP protocol andcomes from a legal user. The packet isthenprocessed in the decryption module basedon a mechanism such as the wiredequivalent privacy (WEP).




It then proceeds to the label taggedvirtual LAN (VLAN) to carry on Layer-3 network authentication process.

If the MAC address of the packet isfrom an illegal user, there are two

different processes to be performeddepending on the frame type filter.



PERFORMANCE ANALYSIS OFCAP DEVICES

Three experiments are conducted to testthe performance of the proposed CAPdevice.

The temperature and connection qualitytest.

The impact of different heights on

transmission effectiveness. The signal quality test at different distance

ranges.



The temperature andconnection quality test



The impact of different heightson transmission effectiveness

Fig. 5. CAP devices placed at different height.



The impact of different heightson transmission effectiveness



The signal quality test atdifferent distance ranges



CONCLUSION

This paper proposed a cost-effective,data access efficient, robust, andeasy to deployment outdoor CAPdevices with AAA-client mechanismthat merges CM module with WLANAP into existing outdoor CATV

amplifiers to assist in constructing aubiquitous network for public wirelessaccess link services and applications.



REFERENCES

Ren-Guey Lee, Chien-Chih Lai, andChun-Chieh Hsiao, “Implementation

of a Cable Access Point Device forUbiquitous Network Applications” IEEE Transactions on Consumer

Electronics, Vol. 52, No. 2, MAY 2006.



REFERENCES

[1] J. Weatherall and A. Jones, “Ubiquitous networks and theirapplications,” IEEE Wireless Commun.,

vol. 9, no. 1, pp. 18–29, Feb. 2002.

[2] S. Yoshino, M. Nakayama, and M.Shimizu, “A new wireless accesssystem for achieving a cost-effectiveubiquitous network,” in Proc. 5 th Int.Symp. Wireless Pers. Multimedia

Commun Oct 2002 pp 606–610

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5 Ubiquitous Network