呃楍档污獩污畯獴-IEEE802.16AirInterfaceforFixed.pptVIP

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呃楍档污獩污畯獴-IEEE802.16AirInterfaceforFixed.ppt

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IEEE 802.16Air Interface for Fixed Broadband Wireless Access Systems Kwangho Kook IEEE 802 Standard 802.3 : CSMA/CD (Ehernet) 802.4 : Token Bus 802.5 : Token Ring 802.6 : MAN 802.11 : Wireless LAN 802.12 : Gigabit LAN 802.16 : Fixed Broadband Wireless Access System IEEE 802.16 802.16 consists of the access point, BS(Base Station) and SSs(Subscriber Stations) All data traffic goes through the BS, and the BS can control the allocation of bandwidth on the radio channel. 802.16 is a Bandwidth on Demand system. IEEE 802.16 [1] Scope : Specifies the air interface, MAC (Medium Access Control), PHY(Physical layer) Purpose : to enable rapid worldwide deployment of cost-effective broadband wireless access products to facilitate competition in broadband access by providing alternatives to wireline broadband access Main advantage : fast deployment, dynamic sharing of radio resources and low cost IEEE 802.16 The spectrum to be used 10 - 66 GHz licensed band Due to the short wavelength Line of sight is required Multipath is negligible Channels 25 or 28 MHz wide are typical Raw data rates in excess of 120 Mbps 2 -11 GHz IEEE Standards Association Project P802.16a Approved as an IEEE standard on Jan 29, 2003 IEEE 802.16 MAC layer function[2] Transmission scheduling : Controls up and downlink transmissions so that different QoS can be provided to each user Admission control : Ensures that resources to support QoS requirements of a new flow are available Link initialization Scans for a channel, synchronizes the SS with the BS, performs registration, and various security issues. Support for integrated voice/data connections Provide various levels of bandwidth allocation, error rates, delay and jitter IEEE 802.16 MAC layer function Fragmentation : Sequence number in the MAC header is used to reassemble at the receiver Retransmission : Implement an ARQ(Automatic Repeat Request) Basic Services UGS(Unsolicited Grant Service) Supports real-time service flows that gener