What is the duration of GSM Sacch multiframe?

This lasts for approximately 4.615 ms (i.e.120/26 ms) and it forms the basic unit for the definition of logical channels. One physical channel is one burst period allocated in each TDMA frame.

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). Finally, there are 156.25 Bits per Timeslot, each Bit being 3.69231 μs long.

What is Sacch in GSM?

Slow Associated Control Channel. A GSM signalling channel that provides a relatively slow signalling connection. The SACCH is associated with either a traffic or dedicated channel. The SACCH can also be used to transfer SMS (Short Message Service) messages if associated with a traffic channel.

What is a Hyperframe?

Hyperframe A Hyperframe is a hierarchical frame structure. In GSM the Hyperframe is either 2048 (normal) or 1024 (classic) Superframes , this depends on the configuration.

What is traffic multiframe?

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 Sdcch traffic?

SDCCH is the channel used for exchange of signaling messages between GSM mobile and network(base station). This is used for pure signaling purpose or establishing traffic connection. SDCCH is allocated to the mobile in AGCH response from base station for the RACH sent by MS.

What is the duration of GSM TDMA frame?

The GSM standard [1] specifies a TDMA frame as a combination of 8 time slots. Each time slot has a duration of 3/5200 seconds (about 0.577 ms) and a time slot number (TN) from 0 to 7. GSM frames use GMSK modulation, where one symbol is equivalent to one bit. Each time slot is 156.25 bits long.

What is superframe in TDMA?

In a TDMA mechanism, the channel is bounded by a superframe structure that consists of a number of time slots allocated by a base-station or a coordinator. The time slots are allocated according to the traffic requirements, i.e., a node gets a time slot whenever it has data to send or receive.

What is SDCCH congestion?

SDCCH Congestion is defined as the probability of failure of accessing a stand-alone dedicated control channel during call set up.