Random access in a mobile telecommunications system

A frame structure for transmission on a random access channel from a mobile terminal to a mobile communications system, said frame structure comprising:

• a preamble;
• a data portion;
• and
• a guard portion between said preamble and said data portion,
• whereby a random access request using said frame structure is transmitted from said mobile terminal to said mobile communication system.

A random access frame structure transmitted on a random access channel from a mobile terminal to a mobile communications system, said random access frame structure comprising:

• a preamble;
• a data portion;
• and
• a guard portion between said preamble and said data portion, said guard portion enables interruption of the transmissions between the mobile terminal and the mobile communications system.

A random access frame structure transmitted on a random access channel from a mobile terminal to a mobile communications system, said random access frame structure comprising:

• an I/Q multiplexed preamble modulated by a preselected signature pattern;
• a data portion;
• and;
• a guard portion between said I/Q multiplexed preamble and said data portion, said guard portion enables detection of said I/Q multiplexed preamble by the mobile communications system before arrival of said data portion thus requiring less buffering and minimizing random access delay.

A mobile communications system comprising:

• a mobile terminal for transmitting a random access frame structure on a random access channel;
• and
• a base station for receiving the random access frame structure, said random access frame structure further including:
• a preamble
• a data portion;
• and
• a guard portion between said preamble and said data portion, said guard portion enables interruption of the transmissions between said mobile terminal and said base station.

A random access frame structure transmitted on a random access channel from a mobile terminal to a mobile communications system, said random access frame structure comprising:

• a preamble;
• a data portion;
• and
• a guard portion between said preamble and said data portion, wherein no transmissions occur between the mobile terminal and the mobile communications system during an interval corresponding with said guard portion.