Comparisons of IEEE 802s

8/12/2019 Comparisons of IEEE 802s

1/8

A Study on IEEE Communication Standard 802

Mid-Term Assignment

WIRELESS COMMUNICATIONS [MTEL] [A]

Corse Teacher: SHARMIN, AFSAH

Submitted By:

Fuad, Kazi Ahmed Asif

ID: 14-97541-1

Masters in EEE

American International University-Bangladesh(AIUB)


2/8

What is IEEE 802?

IEEE 802 is an IEEE standard set which covers the physical and data link layers of the Open Systems Interconnection

(OSI) model defining the standards and protocols for wired local area networks (WLAN), metropolitan area networks

(MAN) and wireless networks; defines characteristics, operating procedures, protocols and services for networks that carry

variable sized packets and specifies the development and handling of compatible devices and equipment. The IEEE 802

family, the most widely used standards are for the Ethernet family is maintained by the IEEE 802 LAN/MAN Standards

Committee (LMSC). IEEE 802 subdivides the data link layer into sub-layers, namely the logical link control (LLC) and

media access control (MAC) layers, which provide protocol multiplexing and a multi-access mechanism, respectively.802

Standards are given below:

802: Overview & Architecture

802.1: Bridging & Management

802.2: Logical Link Control

802.3: Ethernet802.11: Wireless LANs

802.15: Wireless PANs

802.16: Broadband Wireless MANs

802.17: Resilient Packet Rings

802.20: Mobile Broadband Wireless Access

802.21: Media Independent Handover Services802.22: Wireless Regional Area Networks

In this review we will focus on 802.15., 802.16 & 802.20 series.

IEEE 802.15: WIRELESS PERSONAL AREA NETWORKS (PANs)

IEEE 802.15 has subfamilies in which 802.15.4 series is famous for low power and cost effective applications. The goal is to

provide a standard with ultra-low complexity, cost, and power for low-data-rate wireless connectivity among inexpensive fixed,

portable and moving devices. IEEE 802.15.4 deals with only PHY layer and portion of Data link layer. The higher-layer protocols

are left to industry and the individual applications. The Zigbee Alliance is an association of companies involved with building

higher-layer standards based on IEEE 802.15.4. This includes network, security, and application protocols. Network topology

utilizes Star & Pee-to-Peer structure (Figure 1). In Star topology, a FFD (Full-Function Device) works as coordinator, other FFD

& RFD (Refused Function Device) in range as slave on the other hand Peer-to-Peer uses ad hoc network.

Figure 1: Star & Peer-to-Peer Topology


3/8

IEEE 802.15.4 PHY overview

PHY functionalities:

Activation and deactivation of the radio transceiver

Energy detection within the current channel

Link quality indication for received packets

Clear channel assessment for CSMA-CA

Channel frequency selection

Data transmission and receptionFrequency Bands and Data Rates

The standard specifies two PHYs (Figure 2) :

868 MHz/915 MHz direct sequence spread spectrum (DSSS) PHY (11 channels)

1 channel (20Kb/s) in European 868MHz band

10 channels (40Kb/s) in 915 (902-928)MHz ISM band

2450 MHz direct sequence spread spectrum (DSSS) PHY (16 channels)

16 channels (250Kb/s) in 2.4GHz band

Figure 2: Operating frequency bands

PHY packet fields

Preamble (32bits) synchronization

Start of packet delimiter (8 bits)shall be formatted as 11100101 PHY header (8 bits) PSDU

length PSDU (0 to 127 bytes) data field

MAC Layer

It interfaces between the SSCS and the PHY layer. The MAC data service is responsible for the transmission and reception of

the MPDUs through the PHY data service. The IEEE 802.15.4 standard defines four different frame types: the beacon, data,acknowledgment, and MAC command frame. All frame types are based on the general MAC frame format (Figure 3).

Figure 3: General MAC Layer frame format.


4/8

IEEE 802.16: BROADBAND WIRELESSMETROPOLITAN AREA NETWORKS (MANs)

IEEE 802.16 is the IEEE standard for Wireless Metropolitan Area Network (Wireless MAN). IEEE 802.16 based WiMAX stands

for Worldwide Interoperability for Microwave Access. It specifies the air interface for fixed, portable, and mobile broadband

wireless access (BWA) systems supporting multimedia services. WiMAX aims to provide wireless broadband services with a

target range of up to 31 miles at a transmission rate exceeding 100 Mbps. It is also to provide a wireless alternative to cable,DSL and T1/E1 for last mile access. It is designed for point-to-point (PTP) and point-to-multipoint (PTM) topologies but mainly

deployed for point to multipoint topologies. It also support mesh topologies. IEEE 802.16 has three major versions; 802.16-2001,

802.16-2004 and IEEE 802.16-2005. IEEE 802.16 architecture is given below:

Figure 4: IEEE 802.16 Architecture

Frequency Bands

IEEE 802.16e-2005 will initially operate in the 2.3 GHz, 2.5 GHz, 3.3 GHz, 3.4-3.8 GHz spectrum bands.

Support for additional bands will be added on the basis of market demand and new spectrum allocations.

Release-1 of 802.16e profiles will cover 5, 7, 8.75, and 10 MHz channel bandwidths for frequency bands above.

Physical layer

Burst single-carrier modulation

Allows use of directional antennas

Allows use of two different duplexing schemes:

Frequency Division Duplexing (FDD)

Time Division Duplexing (TDD)

Support for both full and half duplex stations

The PHY assumes line-of-sight propagation

It contains several forms of modulations and multiplexing to support different frequency ranges and applications


5/8

Data rates determined by exact modulation and encoding schemes.

Medium Access Control (MAC)

Designed for point-to-multipoint BWA applications.

The original design of MAC is flexible enough to support, with extension, all other projects of the IEEE 802.16

Addresses the need for very high bit rates for both uplink and downlink.

Figure 5: IEEE 802.16 Reference Model and Protocol Stack

MAC and PHY enhancements

- The proposal addresses the need for fast correction,

frequency and timing.

-The proposed PHY layer is based on OFDM/OFDMA

- The configuration offers simplicity for

both fixed and mobile implementations

Power Consumption Reduction

-Battery power for the Mobile Terminal

-Introduce two modes for the SS: Awake-mode and Sleep-

Mode

Mobility Management

-Control by L2.5 Routing

IEEE 802.20: MOBILE BROADBAND WIRELESS ACCESS (MBWA) The IEEE 802.20 standard has been developed to provide a system which is able to provide mobile broadband wireless access,

MBWA for users. It is intended that IEEE 802.20 will enable worldwide deployment of mobile broadband wireless networks using

multi-vendor equipment. Tagged "Mobile-Fi", the aim is that IEEE 802.20 MBWA will provide an interface that will allow low cos

always on mobile broadband connectivity using wireless technology. The IEEE 802.20 working group dates back to 2002 when itwas set up in response to the iBurst standard from ArrayComm. The IEEE 802.20 group was formally adopted in 11 December

2002 with the aim of preparing a formal specification for a packet based service.


6/8


7/8

Comparisons between Standards

Characteristics IEEE 802.15.4 IEEE 802.16 IEEE 802.20

Data rate 250kbps 1Gbps for fixed station at

350kmph

16Mbps,

>2Mbps at the speed of 250 km/h

Latency 49.312 ms 120ms About 30msCell Radius 75m 5-15km for mobile >15km

Spectrum 2.4Ghz Range between 2-11GHz Licensed bands below 3.5Ghz

Switching Method Circuit Circuit Packet

Ad hoc Yes Yes Yes

Infrastructures No Yes Yes

VANET Yes Yes Yes

Figure 6: Power, Cost & data rate comparisons

References:

1. IEEE Std. 802.15 available at: http://standards.ieee.org/about/get/802/802.15.html

2.140.117.169.69/course1/zigbee-802.15.4.ppt

3. Marco Naeve, Eaton Corp., IEEE 802.15.4 MAC Overview, 05/2004

4. IEEE Std. 802.16 available at http://standards.ieee.org/about/get/802/802.16.html

5. IEEE 802.16a Standard and WiMAX Igniting Broadband Wireless Access, white paper, WiMax forum,

www.wimaxforum.org, May 2004.

6. Steven J. Vaughan-Nichols, Achieving wireless broadband with WiMax, Computer IEEE journal, Volume 37, Issue 6,

Page(s):10 13, June 2004

7. IEEE Std. 802.20 available at http://standards.ieee.org/about/get/802/802.20.html
http://standards.ieee.org/about/get/802/802.15.htmlhttp://standards.ieee.org/about/get/802/802.15.htmlhttp://standards.ieee.org/about/get/802/802.15.htmlhttp://standards.ieee.org/about/get/802/802.16.htmlhttp://standards.ieee.org/about/get/802/802.16.htmlhttp://standards.ieee.org/about/get/802/802.16.htmlhttp://standards.ieee.org/about/get/802/802.20.htmlhttp://standards.ieee.org/about/get/802/802.20.htmlhttp://standards.ieee.org/about/get/802/802.20.htmlhttp://standards.ieee.org/about/get/802/802.20.htmlhttp://standards.ieee.org/about/get/802/802.16.htmlhttp://standards.ieee.org/about/get/802/802.15.html


8/8

8. A. Jalili, S. M. Fakhraie, and S. Nader-Esfahani, PerformanceEvaluation ofIEEE 802.20 PHY Layer,(ICCET 2009), Jan.

2009.

9. http://www.ucs.louisiana.edu/~vrb5959/final.pdf

10. WALKER BOLTON, et al, IEEE 802.20:MOBILE BROADBAND WIRELESS ACCESS, IEEE Wireless Communications,

February 2007
http://www.ucs.louisiana.edu/~vrb5959/final.pdfhttp://www.ucs.louisiana.edu/~vrb5959/final.pdfhttp://www.ucs.louisiana.edu/~vrb5959/final.pdfhttp://www.ucs.louisiana.edu/~vrb5959/final.pdf

Documents

Comparisons of IEEE 802s