TABLE OF CONTENTS Multiframes are frames that are grouped or linked together to perform specific functions. Multiframes on the GSM system use established schedules for specific purposes such coordinating frequency hopping patterns. Multiframes used in the GSM system include the 26 traffic multiframe, 51 control multiframe, superframe, and hyperframe.
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. The idle time period allows a mobile device to perform other necessary operations such as monitoring the radio signal strength level of a beacon channel from other cells. The time interval of a 26 frame traffic multiframe is 6 blocks of speech coder data (120 msec).
The 51 control multiframe structure is used to send information on the control channel. 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).
A superframe is a multiframe sequence that combines the period of a 51 multiframe with 26 multiframes (6.12 seconds). The use of the superframe time period allows all mobile devices to scan all the different time frame types at least once.
A hyperframe is a multiframe sequence that is composed of 2048 superframes and is largest time interval in the GSM...
