What is superframe in GSM?
The GSM frame structure is designated as hyperframe, superframe, multiframe and frame. The minimum unit being frame (or TDMA frame) is made of 8 time slots. One GSM hyperframe composed of 2048 superframes. Each GSM superframe composed of multiframes (either 26 or 51 as described below).
What is superframe in wireless Hart?
The WirelessHART standard introduces the concept of the superframe to group a sequence of consecutive time slots. As shown in the bottom part of Figure 5.3, a superframe is periodical, with the total length of the member slots as the period. There could be multiple superframes in a WirelessHART network.
What is superframe in networking?
In telecommunications, superframe (SF) is a T1 framing standard. The pattern sent is 12 bits long, so every group of 12 frames is called a superframe. The pattern used in the 193rd bit is 100011 011100.
What is duration of superframe?
Wireless Personal Area Networks: Low Rate and High Rate 4 LR-WPAN can operate in an optional superframe mode. In a superframe (see Figure 20.9), a dedicated PAN coordinator transmits superframe beacons in predetermined intervals. These intervals can be as short as 15 ms or as long as 245 seconds.
What is multiframe and multiframe control?
Traffic Multiframe Structures The 26 traffic multiframe structure is used to send information on the traffic channel. The 26 traffic multiframe structure is used to combine user data (traffic), slow control signaling (SACCH), and an idle time period.
What is TDMA frame?
TDMA requires a centralized control node, whose primary function is to transmit a periodic reference burst that defines a frame and forces a measure of synchronization of all the users. The frame so-defined is divided into time slots, and each user is assigned a Time Slot in which to transmit its information.
Which modulation technique is used in WirelessHART?
Unlike IEEE 802.15. 4, WirelessHART only defines operation in the 2.4 GHz band, employing Direct Sequence Spread Spectrum (DSSS) and Offset-Quadrature Phase Shift Keying (O- QPSK) modulation. This allows for a bit rate of 250 kbit/s. WirelessHART uses only 15 of the 16 channels defined by the IEEE 802.15.
Which technique is used in WirelessHART?
FHSS and DSSS—To ensure reliability, WirelessHART makes use two techniques: Frequency Hopping Spread Spectrum (FHSS) and Direct Sequence Spread Spectrum (DSSS). WirelessHART is a frequency hopper in its 2.4 GHz band. After each transmission between two network participants, the radio channel changes.
What is superframe structure?
Structure of superframe The superframe can be subdivided into the following three periods: 1) The Contention Free Period (CFP); 2) The Contention Access Period (CAP); 3) The inactive period. Different from the standard IEEE 802.15. 4 protocol, we swap the position of CAP and CFP in the superframe, as shown in Fig. 1.
What is a superframe in architecture?
skyscraper design In construction: Classification of structural systems. …have a low premium: the superframe. In this structure much of the building’s gravity load, and therefore its material, is brought to a diagonally braced superframe tube at the perimeter by interior transfer trusses of various configurations.
What is multiframe in GSM?
A GSM Multiframe is the basic unit, and is 120 ms long. There are 26 Frames in each Multiframe, with each Frame being 4.61538 ms long (120 ms/26). Within each Frame are 8 Timeslots at 576.92 μs per Timeslot (577 μs in round numbers).
What is a control multiframe?
Control Multiframe Structures The 51 frame control multiframe is sub divided into logical channels that include the frequency correction burst, the synchronization burst, the broadcast channel (BCCH), the paging and access grant channel (PACCH), and the stand-alone dedicated control channel (SDCCH).
