CSE5807 Wireless and personal communications systems...
Transcript of CSE5807 Wireless and personal communications systems...
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CSE5807 Wireless and personal communications systems /FIT3024 Internetworking and wireless communications
Week 2. Communication networks. Protocols and the
TCP/IP suite.
Lecture notes are from Stallings Resource Kit, Lecture notes are from Stallings Resource Kit, Wireless communications and networks, 2Wireless communications and networks, 2ndnd Ed, 2005Ed, 2005
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Communication Networks
Chapter 3
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Types of Communication Networks
TraditionalTraditional local area network (LAN)Traditional wide area network (WAN)
Higher-speedHigh-speed local area network (LAN)Metropolitan area network (MAN)High-speed wide area network (WAN)
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Speed and Distance of Communications Networks
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Characteristics of WANsCovers large geographical areasCircuits provided by a common carrierConsists of interconnected switching nodesTraditional WANs provide modest capacity
64000 bps commonBusiness subscribers using T-1 service – 1.544 Mbps common
Higher-speed WANs use optical fiber and transmission technique known as asynchronous transfer mode (ATM)
10s and 100s of Mbps common
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Characteristics of LANsLike WAN, LAN interconnects a variety of devices and provides a means for information exchange among themTraditional LANs
Provide data rates of 1 to 20 MbpsHigh-speed LANS
Provide data rates of 100 Mbps to 1 Gbps
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Differences between LANs and WANs
Scope of a LAN is smallerLAN interconnects devices within a single building or cluster of buildings
LAN usually owned by organization that owns the attached devices
For WANs, most of network assets are not owned by same organization
Internal data rate of LAN is much greater
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The Need for MANsTraditional point-to-point and switched network techniques used in WANs are inadequate for growing needs of organizationsNeed for high capacity and low costs over large areaMAN provides:
Service to customers in metropolitan areasRequired capacityLower cost and greater efficiency than equivalent service from telephone company
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Switching TermsSwitching Nodes:
Intermediate switching device that moves dataNot concerned with content of data
Stations:End devices that wish to communicateEach station is connected to a switching node
Communications Network:A collection of switching nodes
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Switched Network
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Observations of Figure 3.3Some nodes connect only to other nodes (e.g., 5 and 7)Some nodes connect to one or more stationsNode-station links usually dedicated point-to-point linksNode-node links usually multiplexed links
Frequency-division multiplexing (FDM)Time-division multiplexing (TDM)
Not a direct link between every node pair
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Techniques Used in Switched Networks
Circuit switchingDedicated communications path between two stationsE.g., public telephone network
Packet switchingMessage is broken into a series of packetsEach node determines next leg of transmission for each packet
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Phases of Circuit SwitchingCircuit establishment
An end to end circuit is established through switching nodes
Information TransferInformation transmitted through the networkData may be analog voice, digitized voice, or binary data
Circuit disconnectCircuit is terminatedEach node deallocates dedicated resources
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Characteristics of Circuit Switching
Can be inefficientChannel capacity dedicated for duration of connectionUtilization not 100%Delay prior to signal transfer for establishment
Once established, network is transparent to usersInformation transmitted at fixed data rate with only propagation delay
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Components of Public Telecommunications Network
Subscribers - devices that attach to the network; mostly telephonesSubscriber line - link between subscriber and network
Also called subscriber loop or local loopExchanges - switching centers in the network
A switching centers that support subscribers is an end office
Trunks - branches between exchanges
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How Packet Switching WorksData is transmitted in blocks, called packetsBefore sending, the message is broken into a series of packets
Typical packet length is 1000 octets (bytes)Packets consists of a portion of data plus a packet header that includes control information
At each node en route, packet is received, stored briefly and passed to the next node
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Packet Switching
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Packet Switching
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Packet Switching AdvantagesLine efficiency is greater
Many packets over time can dynamically share the same node to node link
Packet-switching networks can carry out data-rate conversion
Two stations with different data rates can exchange information
Unlike circuit-switching networks that block calls when traffic is heavy, packet-switching still accepts packets, but with increased delivery delayPriorities can be used
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Disadvantages of Packet Switching
Each packet switching node introduces a delayOverall packet delay can vary substantially
This is referred to as jitterCaused by differing packet sizes, routes taken and varying delay in the switches
Each packet requires overhead informationIncludes destination and sequencing informationReduces communication capacity
More processing required at each node
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Packet Switching Networks -Datagram
Each packet treated independently, without reference to previous packetsEach node chooses next node on packet’s pathPackets don’t necessarily follow same route and may arrive out of sequenceExit node restores packets to original orderResponsibility of exit node or destination to detect loss of packet and how to recover
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Packet Switching Networks –Datagram
Advantages:Call setup phase is avoidedBecause it’s more primitive, it’s more flexibleDatagram delivery is more reliable
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Packet Switching Networks –Virtual Circuit
Preplanned route established before packets sentAll packets between source and destination follow this routeRouting decision not required by nodes for each packetEmulates a circuit in a circuit switching network but is not a dedicated path
Packets still buffered at each node and queued for output over a line
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Packet Switching Networks –Virtual Circuit
Advantages:Packets arrive in original orderPackets arrive correctlyPackets transmitted more rapidly without routing decisions made at each node
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Effect of Packet Size on Transmission
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Effect of Packet Size on Transmission
Breaking up packets decreases transmission time because transmission is allowed to overlapFigure 3.9a
Entire message (40 octets) + header information (3 octets) sent at onceTransmission time: 129 octet-times
Figure 3.9bMessage broken into 2 packets (20 octets) + header (3 octets)Transmission time: 92 octet-times
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Effect of Packet Size on Transmission
Figure 3.9cMessage broken into 5 packets (8 octets) + header (3 octets)Transmission time: 77 octet-times
Figure 3.9dMaking the packets too small, transmission time starts increasesEach packet requires a fixed header; the more packets, the more headers
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Asynchronous Transfer Mode (ATM)
Also known as cell relayOperates at high data ratesResembles packet switching
Involves transfer of data in discrete chunks, like packet switchingAllows multiple logical connections to be multiplexed over a single physical interface
Minimal error and flow control capabilities reduces overhead processing and sizeFixed-size cells simplify processing at ATM nodes
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ATM TerminologyVirtual channel connection (VCC)
Logical connection in ATMBasic unit of switching in ATM networkAnalogous to a virtual circuit in packet switching networksExchanges variable-rate, full-duplex flow of fixed-size cells
Virtual path connection (VPC)Bundle of VCCs that have the same end points
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Advantages of Virtual PathsSimplified network architectureIncreased network performance and reliabilityReduced processing and short connection setup timeEnhanced network services
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Call Establishment
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Virtual Channel Connection UsesBetween end users
Can carry end-to-end user data or control signaling between two users
Between an end user and a network entityUsed for user-to-network control signaling
Between two network entitiesUsed for network traffic management and routing functions
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Virtual Path/Virtual Channel Characteristics
Quality of serviceSpecified by parameters such as cell loss ratio and cell delay variation
Switched and semipermanent virtual channel connectionsCell sequence integrityTraffic parameter negotiation and usage monitoringVirtual channel identifier restriction within a VPC
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ATM Cell Header FormatGeneric flow control (GFC) – 4 bits, used only in user-network interface
Used to alleviate short-term overload conditions in network
Virtual path identifier (VPI) – 8 bits at the user-network interface, 12 bits at network-network interface
Routing fieldVirtual channel identifier (VCI) – 8 bits
Used for routing to and from end user
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ATM Cell Header FormatPayload type (PT) – 3 bits
Indicates type of information in information field
Cell loss priority (CLP) – 1 bitProvides guidance to network in the event of congestion
Header error control (HEC) – 8 bitError code
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ATM Service CategoriesReal-time service
Constant bit rate (CBR)Real-time variable bit rate (rt-VBR)
Non-real-time serviceNon-real-time variable bit rate (nrt-VBR)Available bit rate (ABR)Unspecified bit rate (UBR)
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Examples of CBR ApplicationsVideoconferencingInteractive audio (e.g., telephony)Audio/video distribution (e.g., television, distance learning, pay-per-view)Audio/video retrieval (e.g., video-on-demand, audio library)
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Examples of UBR applicationsText/data/image transfer, messaging, distribution, retrievalRemote terminal (e.g., telecommuting)
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Protocols and the TCP/IP Suite
Chapter 4
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Key Features of a ProtocolSyntax
Concerns the format of the data blocksSemantics
Includes control information for coordination and error handling
TimingIncludes speed matching and sequencing
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Agents Involved in Communication
ApplicationsExchange data between computers (e.g., electronic mail)
ComputersConnected to networks
NetworksTransfers data from one computer to another
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TCP/IP LayersPhysical layerNetwork access layerInternet layerHost-to-host, or transport layerApplication layer
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TCP/IP Physical LayerCovers the physical interface between a data transmission device and atransmission medium or networkPhysical layer specifies:
Characteristics of the transmission mediumThe nature of the signalsThe data rateOther related matters
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TCP/IP Network Access LayerConcerned with the exchange of data between an end system and the network to which it's attachedSoftware used depends on type of network
Circuit switchingPacket switching (e.g., X.25)LANs (e.g., Ethernet)Others
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T:TCP/IP Internet LayerUses internet protocol (IP)Provides routing functions to allow data to traverse multiple interconnected networksImplemented in end systems and routers
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TCP/IP Host-to-Host, or Transport Layer
Commonly uses transmission control protocol (tcp)Provides reliability during data exchange
CompletenessOrder
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TCP/IP Application LayerLogic supports user applicationsUses separate modules that are peculiar to each different type of application
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Protocol Data Units (PDUs)
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Common TCP/IP ApplicationsSimple mail transfer protocol (SMTP)
Provides a basic electronic mail facilityFile Transfer Protocol (FTP)
Allows files to be sent from one system to another
TELNETProvides a remote logon capability
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Layers of the OSI ModelApplicationPresentationSessionTransportNetworkData linkPhysical
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OSI Application LayerProvides access to the OSI environment for usersProvides distributed information services
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OSI Presentation LayerProvides independence to the application processes from differences in data representation (syntax)
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OSI Session LayerProvides the control structure for communication between applicationsEstablishes, manages, and terminates connections (sessions) between cooperating applications
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OSI Transport LayerProvides reliable, transparent transfer of data between end pointsProvides end-to-end error recovery and flow control
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OSI Network LayerProvides upper layers with independence from the data transmission and switching technologies used to connect systemsResponsible for establishing, maintaining, and terminating connections
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OSI Data link LayerProvides for the reliable transfer of information across the physical linkSends blocks (frames) with the necessary synchronization, error control, and flow control
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OSI Physical LayerConcerned with transmission of unstructured bit stream over physical mediumDeals with accessing the physical medium
Mechanical characteristicsElectrical characteristicsFunctional characteristicsProcedural characteristics
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Comparison of OSI and TCP/IP
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TCP/IP Architecture DominanceTCP/IP protocols matured quicker than similar OSI protocols
When the need for interoperability across networks was recognized, only TCP/IP was available and ready to go
OSI model is unnecessarily complexAccomplishes in seven layers what TCP/IP does with fewer layers
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Elements of Standardization within OSI Framework
Protocol SpecificationFormat of protocol data units (PDUs) exchangedSemantics of all fieldsAllowable sequence of PDUs
Service DefinitionFunctional description that defines what services are provided, but not how the services are to be provided
AddressingEntities are referenced by means of a service access point (SAP)
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Internetworking TermsCommunication network – facility that provides a data transfer service among devices attached to the networkInternet – collection of communication networks, interconnected by bridges/routersIntranet – internet used by an organization for internal purposes
Provides key Internet applicationsCan exist as an isolated, self-contained internet
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Internetworking TermsEnd System (ES) – device used to support end-user applications or servicesIntermediate System (IS) – device used to connect two networksBridge – an IS used to connect two LANs that use similar LAN protocolsRouter - an IS used to connect two networks that may or may not be similar
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Functions of a RouterProvide a link between networksProvide for the routing and delivery of data between processes on end systems attached to different networksProvide these functions in such a way as not to require modifications of the networking architecture of any of the attached subnetworks
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Network Differences Routers Must Accommodate
Addressing schemesDifferent schemes for assigning addresses
Maximum packet sizesDifferent maximum packet sizes requires segmentation
InterfacesDiffering hardware and software interfaces
ReliabilityNetwork may provide unreliable service