elprince_performance evaluation study for hiperlan wlan protocol-final
TRANSCRIPT
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8/8/2019 Elprince_Performance Evaluation Study for HiperLan WLAN Protocol-FINAL
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Performance Evaluation
Study for HiperLan WLANProtocol
Omar A. ElprinceStudent#220510
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Agenda
Wh at is HIPERLAN?Origin of HIPERLANHIPERLAN MAC
Mec h anismHIPERLAN FamilyFeatures of HiperLAN/2MAC Frame StructureTransport C h annelsTh e C h annel Access Mec h anismSignaling and ControlError ControlSimulation Results
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Wh at is HIPERLAN?
HIPERLAN - HIg h PErformance Radio LANHIPERLAN is a new standard for Radio LANs
developed in Europe by ETSIHIPERLAN is an interoperability standard w h ich specifies a common air interface MAC and PHYlayers in OSI modelHIPERLAN will be a family of standards
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O rigin of HIPERLAN
Early wireless LANs operating in t h e ISM bands(900MHz and 2.45GHz)
Low data rate (~1Mbps) - an indirect result of t h e FCCspread spectrum rules part 15.247.Severe interference environment - from unlike wirelessLANs and ot h er ISM band systems.
Lack of standards - IEEE 802.11 was initiated to satisfyth is need but it was taking time to develop.ETSI set up RES10 group to develop a standard t h atwould be equal in performance to wired LANs suc h asEt h ernet.
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HIPERLAN MAC
Concept:Fully distributed MAC networks wit h and wit h out infrastructurepermits multi- h op relaying via neig h bors based on LBT (Listenbefore talk)Ch annel Access Mec h anism is based on c h annel sensing and acontention resolution sc h eme calledEY-NPMA - Elimination Yield Non-pre-emptive Priority Multiple
Access using listen-talk contention resolution and using talk-listen Immediate packet acknowledgment.It defines a priority sc h eme and a life time for eac h packet w h ich facilitate t h e control of QoS.
In addition to routing it h andles t h e encryption and power conservation.
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HIPERLAN MAC (Contd)
The Channel Access Mechanism
Th e c h annel access cycle consists of t h ree p h ases: t h eprioritization p h ase, t h e contention p h ase and t h etransmission p h ase.Th e aim of t h e prioritization p h ase is to allow only nodeswith th e h igh est c h annel access priority frame toparticipate in t h e next p h ase.Th e contention p h ase starts immediately after t h e
transmission of th
e prioritization burst, and it furth
er consists of two p h ases: t h e elimination p h ase and t h eyield p h ase.Th e transmission p h ase begins if t h e c h annel is sensedidle during t h e yield listening interval.
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HIPERLAN MAC (Contd)Function:
Station 1
Station 2
Station 3
Station 4
Time
data packet
s tops
stops
stops
pri o ritis a tion conten tion tran smis s ion
Listen
Talk
Listen
Listen
Listen
Talk
Talk
Talk
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PhasesPrioritization Phase
1-5 slots of 168bits (talk)Contentions PhaseElimination - 0-12 slots of 212bits (talk),1 slot of 256bits (listen), prob(talk-listen) = 0.5Yield - 0-9 slots of 168bits (listen), prob(n) = 0.1Tx to Rx turn around time 6 Q s256 contenders, 3.5% collision probabilityTotal of 0-5152bits (0-219 Q s) MAC h eader
HIPERLAN MAC (Contd)
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Previous simulations s h ow t h at t h e HIPERLANMAC can simultaneuosly support25 audio links @ 32kbit/s, 10ms delivery25 audio links @ 16kbit/s, 20ms delivery1 video link @ 2Mbit/s, 100ms delivery
Async h file transfer @ 13.4Mbit/s
HIPERLAN MAC (Contd)
Performance:
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HIPERLAN MAC (Contd)
Operation Parameter SettingParameter ValueCh annel Bit Rate (Mbit/sec) 23.5CAM Priority Levels 5Maximum number of subsequence Eliminationbursts
12
Priority of bursting in an elimination slot
0.5Maximum number of subsequence Yield listening 14Probability of listening in a Yield slot 0.9
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NORMALISE DRESI DU ALLIFETIME
HIGHU SER
D EFINE D
PRIORITY
LOW U SER
D EFINE D
PRIORITYNRL < 10ms 0 110ms < NRL