HIPERLAN: HIgh PEr as long as mance Radio Local Area Networks I. Introduction

HIPERLAN: HIgh PEr as long as mance Radio Local Area Networks I. Introduction www.phwiki.com

HIPERLAN: HIgh PEr as long as mance Radio Local Area Networks I. Introduction

Burnstein, Sergio, Contributing Editor has reference to this Academic Journal, PHwiki organized this Journal HIPERLAN: HIgh PEr as long as mance Radio Local Area Networks By Lei Fang (lfang@nd.edu), Wenyi Zhang (wzhang1@nd.edu) 5th November 2001 I. Introduction Roughly speaking there are two types of wireless networks: Local Area Networks (LAN) Bluetooth, 802.11 Family, HiperLAN Family, HomeRF Wide Area Networks (WAN) GSM, 3G, 4G, Iridium Mobility in addition to data rates as long as communications st in addition to ards

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Two main st in addition to ards families as long as Wireless Lan: IEEE 802.11 (802.11b, 802.11a, 802.11g ) ETSI Hiperlan (Hiperlan Type 1, Type 2, HiperAccess, HiperLink ) HiperLAN Family Motivation of HiperLAN Massive Growth in wireless in addition to mobile communications Emergence of multimedia applications Dem in addition to s as long as high-speed Internet access Deregulation of the telecommunications industry The History, Present in addition to Future HiperLAN Type 1 Developed by ETSI during 1991 to 1996 Goal: to achieve higher data rate than IEEE 802.11 data rates: 1~2 Mbps, in addition to to be used in ad hoc networking of portable devices Support asynchronous data transfer, carrier-sense multiple access multiple access with collision avoidance (CSMA/CA), no QoS guaranteed. Products Proxim’s High Speed RangeLAN5 product family (24Mbps; 5GHz; QoS guaranteed) RadioLAN’s products as long as indoor wireless communication (10Mbps; 5GHz; Peer-to-Peer Topology)

HiperLAN Type 2 Next generation of HiperLAN family: Proposed by ETSI BRAN (Broadb in addition to Radio Access Networks) in 1999, in addition to is still under development. Goal: Providing high-speed (raw bit rate ~54Mbps) communications access to different broadb in addition to core networks in addition to moving terminals Features: connection-oriented, QoS guaranteed, security mechanism, highly flexibility Product: Prototypes are available now, in addition to commercial products are expected at the end of 2001 (Ericsson). HiperAccess in addition to HiperLink In parallel to developing the HIPERLAN Type 2 st in addition to ards, ETSI BRAN has started work on st in addition to ards complementary to HIPERLAN Type 2 Relevant Organizations St in addition to ards body: ETSI (European Telecommunications St in addition to ards Institute, www.etsi.org) Technology alliance: HiperLAN2 Global Forum (H2GF, www.hiperlan2.com): promote HiperLAN Type 2 as a st in addition to ard, in order to accelerate its use in business in addition to consumer industries. OFDM Forum (www.ofdm- as long as um.com): OFDM is the cornerstone technology as long as high-speed wireless LAN such as HiperLAN. Industry backers: Texas Instruments, Dell, Bosch, Ericsson, Nokia,Telia, Xircom ADC Communications Alcatel Adaptive Broadb in addition to Axis Bosch Cambridge Silicon Radio Canon Dell Elisa Emtac Ericsson Eumitcom Grundig HLAN Intersil KDI Lucent Matsushita Communications Mediascape Mitsubishi Motorola National Semiconductors Nokia NTT Philips Samsung Siemens Silicon Wave Sony International Systemonic AG TDK Telia Texas Instruments Thomson 3Com T-Span Wireless Communication Xircom H2GF Membership Status – Commercial Support

Typical application scenarios HiperLAN: A complement to present-day wireless access systems, giving high data rates to end-users in hot-spot areas. Typical app. Environment: Offices, homes, exhibition halls, airports, train stations, etc. Different with Bluetooth, which is mainly used as long as linking individual communication devices within the personal area network II. Hiperlan2 System Overview Features 5 GHz technology, up to 54 Mbit/s Generic architecture supporting: Ethernet, IEEE 1394, ATM, 3G etc Connection-oriented with QoS per conn. Security – authentication & encryption Plug- in addition to -play radio network using DFS Optimal throughput scheme

MAC CAC PHY HiperLAN Type 1 Reference Model PHY MAC EC ACF DCC RLC DLC CL HiperLAN Type 2 Reference Model Control Plane User Plane MAC: Medium Access Sublayer EC: Error Control CAC: Channel Access Control Sublayer RLC: Radio Link Control PHY: Physical Layer RRC: Radio Resource Control DLC: Data Link Control Layer ACF: Association Control Function CL: Convergence Layer DCC: DLC Connection Control Architecture RRC Physical Layer Data units on physical layer: Burst of variable length, consist of a preamble in addition to a data field Reference configuration 1: in as long as mation bits 2: scrambled bits 3: encoded bits 4: interleaved bits 5: sub-carrier symbols 6: complex baseb in addition to OFDM symbols 7: PHY bursts Spectrum plays a crucial role in the deployment of WLAN Currently, most WLAN products operate in the unlicensed 2.4GHz b in addition to , which has several limitations: 80MHz b in addition to width; spread spectrum technology; interference Spectrum allocation as long as Hiperlan2

Modulation scheme: Orthogonal frequency-division multiplexing (OFDM) Robustness on highly dispersive channels of multipath fading in addition to intersymbol interference Spectrally efficient Admits great flexibility as long as different modulation alternatives Facilitated by the efficiency of FFT in addition to IFFT algorithms in addition to DSP chips Hiperlan2: 19 channels (20MHz apart). Each channel divided into 52 subcarriers Encoding: Involves the serial sequencing of data, as well as FEC Key feature: Flexible transmission modes With different coding rates in addition to modulation schemes Modes are selected by link adaptation BPSK, QPSK as well as 16QAM (64QAM) supported Data Link Control Layer

Three main control functions Association control function (ACF): authentication, key management, association, disassociation, encryption Radio resource control function (RRC): h in addition to over, dynamic frequency selection, mobile terminal alive/absent, power saving, power control DLC user connection control function (DCC): setup in addition to release of user connections, multicast in addition to broadcast Connection-oriented After completing association, a mobile terminal may request one or several DLC connections, with one unique DLC address corresponding to each DLC connection, thus providing different QoS as long as each connection DLC: MAC Sublayer Basic frame structure (one-sector antenna) BCH (broadcast channel): enables control of radio resources FCH (frequency channel): exact description of the allocation of resources within the current MAC frame ACH (access feedback channel): conveys in as long as mation on previous attempts at r in addition to om access Multibeam antennas (sectors) up to 8 beams supported A connection-oriented approach, QoS guaranteed

Hiperlan implements QoS through time slots QoS parameters: b in addition to width, bit error rate, latency, in addition to jitter The original request by a MT to send data uses specific time slots that are allocated as long as r in addition to om access. AP grants access by allocating specific time slots as long as a specific duration in transport channels. The MT then sends data without interruption from other MT operating on that frequency. A control channel provides feedback to the sender. DLC: Error Control Acknowledged mode: selective-repeat ARQ Repetition mode: typically used as long as broadcast Unacknowledged mode: unreliable, low latency DLC: other features Radio network functions: Dynamic frequency selection; h in addition to over; link adaptation; multibeam antennas; power control QoS support: Appropriate error control mode selected; Scheduling per as long as med at MAC level; link adaptation; internal functions (admission, congestion control, in addition to dropping mechanisms) as long as avoiding overload III. Comparison with Peers Main competitor: IEEE 802.11 Family 802.11b vs. HiperLAN Type 1 802.11a vs. HiperLAN Type 2 Pros High rate with QoS support: Suitable as long as data in addition to multimedia app. Security mechanism Flexibility: different fixed network support, link adaptation, dynamic frequency selection

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Cons High cost Tedious protocol specification Limited outdoor mobility No commercial products in market till now IV. Conclusion Will Hiperlan st in addition to ards replace 802.11 There will be a fight between connection in addition to connectionless camps Hiperlan2/802.11a Current products under development in addition to becoming available only offer 25Mbps Hiperlink 155Mbps data rates still some way off Wireless: Useful as an adjunct to the wired world

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