IEEE- 802.16a Standard specification- Wimax standards
Post by Jawad Ahmad Riaz
Specifications of wireless broadband technologies IEEE
For the transmission frequency used is between 10 GHz and 66 GHz and is a sight (LOS) defined. In Germany used frequency ranges at 23 GHz and 38 GHz. As in the urban area are usually no direct line of sight is available, there is still a second 802.16a specification for the frequency range between 2 GHz and 11 GHz for poor visibility conditions.
The standardization bodies of 802.16 deal equally with the media access method (MAC) and Physical Layer (PHY), with broadband transmission lines with bandwidths of 20 MHz, 25 MHz and 28 MHz for the channels of the up-and downlink is expected. As a media access process, which the different environments of the physical layer adapted to be used with 802.16 TDMA Time Division Duplex (TDD) or frequency division duplex (FDD). As the maximum data rate will be 134 Mbps for a 28-MHz channel indicated. Moreover, 802.16 defines four classes of service, guaranteed service (QoS), the time-critical transmission of audio and video files.
This Working Group, the Broadband Wireless Access (BWA) is working very closely with the 802.11 Working together. The results are incorporated into the WiMAX one.
The various 802.16 standards.
802.16a: Licensed Frequency 2 GHz to 11 GHz. The Working IEEE 802.16a operates at the MAC and PHY specification and specifies the transfer of non-visual connections (NLOS). Frequencies are important for the 3.5 GHz and 5.8 GHz licensed for royalty-free applications. The data is at a channel width of 20 MHz 75 Mbit / s. 802.16a is replaced by 802.16-2004.
Specifications of 802.16
802.16b: Licensed Exempt Frequencies, with a focus on the frequency band of between 5 GHz and 6 GHz. This group also runs under the name Wireless HUMAN (High Speed Unlicensed MAN).
802.16c: Profiles of transmission frequencies in the frequency range from 10 GHz to 66 GHz. The channel width is in the U.S. 25 MHz, 28 MHz in Europe. 802.16c is replaced by 802.16-2004.
802.16d: Profiles of transmission frequencies in the frequency range of 2 GHz to 66 GHz. Replaced by 802.16-2004. This standard provides visual and non-visual connections in the range of 2 GHz to 66 GHz.
802.16e-2005: Mobile Wireless MAN (WMAN). This working group defines a mobile access in the context of IEEE 802.16. Here are ranges of more than 10 Mbps in cells in the range of several kilometers and speeds exceeding 100 kph investigated. In addition, 16e-clients between different radio cells can switch, known as roaming. 802.16e is in conjunction with DSRC an interesting alternative for telematic and safety services in the automotive technology.
802.16f: MIB management for access networks.
802.16g: Definition of Management Plane.
802.16h: Coexistence of Networks. This Working Group deals with the problems of coexistence of different radio technologies in unlicensed bands transmission.
802.16i: Mobile One Plane Information
802.16j: bridging alternative to 802.11k. This involves Equipment for a mobile relay, which has several communications partner stations can connect.
802.16m: 802.16m The group is working on the high-speed transmission with up to 1 Gbit / s.
802.16-1: Air Interface for 10 GHz to 66 GHz.
802.16.2: Coexistence of Broadband Wireless Access Systems. This Working Group deals with the coexistence of existing systems. Replaced by 802.16.2-2004.
802.16.2-2004: Combines standards 802.16, 802.16a, 802.16c and 802.16d in a standard and regulate the coexistence of wireless broadband systems in the range of 10 GHz to 66 GHz.
802.16.2a: Recommended Practice for Coexistence of Fixed Broadband Wireless Access Systems. This group is the coexistence of PMP systems between 2 GHz and 11 GHz redefine.
802.16.3: Air Interface for Fixed Broadband Wireless Access Systems operating below 11 GHz. In this group are the unlicensed bands, such as the ISM band, the Personal Communications Services (PCS), and MMDS Unii for the use of a high-speed access MAN investigated
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