Random access in a mobile telecommunications system
AssigneeTelefonaktielbolaget L M Ericsson (publ)
InventorsPer Narvinger, Maria Gustafsson
Life of this patent
Estimating the term…
Abstract
An uplink common physical channel (random access channel) frame structure with a separate preamble and data portion. The preamble is used by a base station to detect that a mobile station is attempting a random access request. The data portion of the channel includes user data, and pilot symbols that provide energy for channel estimation during reception of the data portion. A guard interval can be generated using a “filler” made up of dummy chips, predetermined symbols, and/or an unmodulated carrier, and inserted between the preamble and data portion of the frame, thus enabling a mobile station to maintain its power transmission and making it easier to implement such a guard interval in a WCDMA system.
Claims25
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, said guard portion including at least one dummy chip,
- whereby a random access request using said frame structure is transmitted from said mobile terminal to said mobile communication 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 included in said preamble, said guard portion including at least one of a plurality of filler signals,
- whereby a random access request using said frame structure is transmitted from said mobile terminal to said mobile communication 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 plurality of slots, said plurality of slots including a first portion and a second portion, said first portion of said plurality of slots comprising a preamble, said second portion of said plurality of slots comprising a guard portion, said guard portion including at least one of a plurality of filler signals;
- and
- a data portion, said data portion following said plurality of slots,
- wherein said guard portion is of a length that is not an integer number of slots but whereby said length is selected such that said first portion and said second portion in combination form an integer number of slots, and whereby a random access request using said frame structure is transmitted from said mobile terminal to said mobile communication 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, said guard portion including at least one of a dummy chip and an unmodulated carrier,
- whereby a random access request using said frame structure is transmitted from said mobile terminal to said mobile communication system.
Dependencies are inferred from the claim text.