IEEE 802.20-2008 pdf download IEEE Standard for Local and metropolitan area networks Part 20: Air Interface for Mobile Broadband Wireless Access Systems Supporting Vehicular Mobility— Physical and Media Access Control Layer Specification
For the purposes of this document, the following terms and definitions apply. The Authoritative DictionaryofIEEE Standard Terms B1′ should be referenced for terms not defined in this clause.
3.1 access network: Access network is a collection of access nodes (ANs).
3.2 access node (AN): The physical device that implements the MAC and PHY of one or more sectors in thenetwork.
3.3 access probe: A sequence of signaling transmitted by the access terminal on the reverse access channelto establish a connection to the access network.
3.4 access sequence index: An identifier to distinguish an access terminal before a MACID is assigned to itThis is used for initial access.
3.5 access terminal (AT): A device providing data connectivity to a user. An access terminal may beconnected to a computing device such as a laptop personal computer or it may be a self-contained datadevice such as a personal digital assistant.
3.6 acquisition pilot: The first TDM pilot in the superframe preamble. This is used for initial acquisition.
3.7 active set: A set of sectors maintained in an access terminal that are assigned a MACID to the accessterminal.
3.8 band class: A set of frequency channels and a numbering scheme for these channels.
3.9 base layer: See: layered modulation
3.10 base station (BS): The device in the access network that communicates over the air interface, via oneor more sectors, with the user terminals. Base stations coordinate the management of the air interfaceattributes.
3.11 beacon: A deterministic signal used to indicate the presence of an access network to the accessterminals.
3.12 beacon orthogonal frequency division multiplexing (OFDM) symbol: A number of OFDM symbolsallocated for transmission of the forward beacon pilot channel per every two superframes.
3.13 beacon subcarrier group: A subset of subcarriers belonging to the set of usable subcarriers in abeacon OFDM symbol.
3.14 block: A set of subcarriers.
3.15 block resource channel: A channel in which the hop-ports are mapped to a group of adjacentsubcarriers in units of tiles.
3.16 CDMA hopping zone: The set of subcarriers over which the CDMA subsegments can be transmittedon the Reverse Link.
3.17 CDMA segment: The collection of all CDMA subsegments in the reverse link.
3.18 CDMA subsegment: A collection of fixed number of subcarriers in reverse link allocated for thetransmission of code division multiple access channels.
3.19 channel interleaver: The entity that permutes a sequence of symbols before transmission.
3.20 channel quality indicator: A quantized measurement of Forward Link channel quality.
3.21 Code Division Multiple Access (CDMA): A technique for spread-spectrum multiple-access digitalcommunications that creates channels through the use ofunique code sequences.
3.22 code symbol: The output of an error-correcting encoder. Information bits are input to the encoder andcode symbols are output from the encoder. See: block code, convolutional code, turbo code. and LDPC
code
3.23 common pilot: A pilot in the forward common pilot channel.
3.24 common segment: A set of hop-ports present in all forward link PHY frames containing all thecommon forward control channels, where the common forward control channels consist of all channelscarried on the forward link control segment except the forward shared control channel, The commonsegment may contain the forward shared control channel under certain conditions.