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This course consist on introduction to wireless communication, evolution of wireless communication systems, medium access techniques, propagation models, error control techniques, cellular systems, emerging networks. This lecture inlcudes: Ip, Bluetooth, Security, Standard, Topology, Coordinatin, Piconet, Start, End, Power, Management
Typology: Slides
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Outlines
IP Over Bluetooth
Bluetooth Security
WPAN Standards
IEEE 802.15.3 Overview
802.15.3 ►
Topology
►
Coordination•^
Starting a Piconet
-^
Handing over control of piconet
-^
Creating child piconet
-^
Ending a Piconent
-^
Association/Disassociation
►
Medium Access (Superframe)
►
Channel Time Management
►
Power management
►
MAC Frame format
Last Lecture
Bluetooth introduction
Technical features
Access technique
Bluetooth topology/scenario
Specifications
Architecture
Core Protocols
Packet format
Link connections
IP Over Bluetooth
IP over Bluetooth v 1.
Security
PIN (1 – 16 bytes)
Link key (128 bit)
Encryption key (128 bit)
Key-stream generator
Payload key
PIN (1 – 16 bytes)
Link key (128 bit)
Encryption key (128 bit)
Key-stream generator
Payload key
Pairing Authentication Encryption Ciphering User input (initialization)
Authentication key generation(Possibly permanent storage)
Encryption key generation(Possibly permanent storage)
Cipher data
Data
Data
IEEE 802.15.3 - Overview
High data rate WPAN
Potential future standard
Motivation: Data, High quality TV, Homecinema
Dynamic topology ►
Mobile devices often join and leave the piconet
►
Short connection times
Multiple Power Management modes
Secure Network
2.4 GHz PHY ►
4 channels (high density) or 3 channels (with802.11b) modes are available
►
Supports 5 data rates•^
11Mbps(QPSK)
-^
22Mbps(DQPSK without coding)
-^
33Mbps(16QAM)
-^
44Mbps(32QAM), 55Mbps(64QAM)
IEEE 802.15.3 - Topology
802.15.
IEEE 803.15.3 MAC is designed to support thefollowing goals: ►
Fast connection time
►
Ad hoc networks
►
Data transport with quality of service (QoS)
►
Security
►
Dynamic membership
►
Efficient data transfer
Creating a child piconet ►
A child piconet is one that is formed under anestablished piconet. The established piconet thenbecomes the parent piconet.
►
The child piconet functionality is useful for eitherextending the area of coverage of the piconet orshifting some computational or memoryrequirements to another PNC capable DEV.
►
The child piconet uses a distinct piconet ID (PNID)and acts as an autonomous piconet except that it isdependent on a private CTA from the parent piconet.
Ending a piconet ►
If the PNC is going to stop operation and there are no otherPNC capable DEVs in the piconet, the PNC places the PNCShutdown information element (IE) into the beacon to notify themembers of the piconet.
►
In the case that the PNC abruptly leaves the piconet withouthanding over control to another PNC capable DEV in thepiconet, the piconet stops operation.
►
After the association timeout period (ATP) expires, a PNCcapable DEV from the old piconet will be able to start a newpiconet using the normal process,
►
In the case of dependent piconets, the parent PNC is able toend the dependent piconet via the Disassociation Requestcommand,
Security
Security for the piconet is one of two modes ►
Mode 0 Open:•^
Security membership is not required and payload protection(either data integrity or data encryption) is not used by theMAC. The PNC is allowed to use a list of DEV addresses toadmit or deny entry to the piconet.
►
Mode 1—Secure membership and payloadprotection:
IEEE 802.15.3 - Superframe
The super-frame is composed of three parts: ►
The beacon•^
Which is used to set the timing allocations and tocommunicate management information for the piconet.
►
The contention access period (CAP)•^
Which is used to communicate commands and/orasynchronous data if it is present in the superframe.
►
The channel time allocation period (CTAP)•^
Which is composed of channel time allocations (CTAs),including management CTAs (MCTAs).
IEEE 802.15.3 - CAP
CAP ►
Allows contention via CSMA/CD
CTA ►
The CTAP, uses a standard TDMA protocol where the DEVshave specified time windows,
Contention Free Access ►
To enable power saving and QoS
►
CTA•^
Private CTA
for dependent piconet
-^
Dynamic CTA
scheduled on a superframe by superframe basis
-^
Pseudo-Static CTA
only for isochronous stream. Allowed to
transmit during CTA as long as the number of consecutive lostbeacon is less then mMaxLostBeacons
Channel time management
There are three methods for communicatingdata between DEVs in the piconet: ►
Sending asynchronous data in the CAP, if present.
►
Allocating channel time for isochronous streams inthe CTAP.
►
Allocating asynchronous channel time in the CTAP.
