Message access for radio telecommunications system

• US 6,992,998 B1
• Filed: 12/10/1999
• Issued: 01/31/2006
• Est. Priority Date: 03/18/1999
• Status: Expired due to Term

• Current Assignee: WSOU Investments, LLC (WSOU Holdings, LLC)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Lim, Seau Sian, Cao, Qiang, Bhatoolaul, David Lahiri
• Primary Examiner(s): Nguyen, Chau
• Assistant Examiner(s): PARK, JUNG H
• Application Number:
  US09/936,102
• Time in Patent Office: 2,244 Days
• Field of Search: 370/335, 370/342, 370/329, 370/337, 455/455
• US Class Current: 370/329
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04W 52/48 during retransmission after error or non-acknowledgment
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 74/0866 using a dedicated channel for access

Abstract

A mobile for use in the UMTS is arranged, on activation to read the Broadcast Control Channel (BCCH) for all available preamble signatures; to store the signatures in its processor; to read the Acquisition Indication Channel (AICH) for acquisition indicators sent to other mobiles; to store usage of other mobiles against each signature; and to select when required a signature the recorded usage of which is unlikely to cause collisions.

Claims

1. A mobile telephone for the universal radio mobile telecommunications system comprising, a processor, a transmitter/receiver, and an antenna, arranged, during call set-up, to transmit an access packet to a base station, said packet comprising a preamble including one of a plurality of available preamble signatures previously obtained from the base station and stored by the mobile, characterized in that the processor is arranged, when the mobile is in an active mode to monitor the acquisition indication channel of the system;

to store for the duration of the active mode the usage by other mobile telephones of each available preamble signature; and

to select when required a signature the recorded usage of which is unlikely to cause collisions.

2. A mobile telephone according to claim 1 in which, for selection of a preamble signature for the determination of the primary node of the channelisation codes used by a message part of an access burst from the mobile, the mobile telephone selects a signature indicated in its store as being unused by other mobiles.

3. A mobile telephone according to claim 1 or claim 2 in which, for reselection of a preamble signature, the mobile telephone selects a signature indicated in its store as being least used by other mobile telephones.

4. A method of operation, in a radio mobile telecommunications system comprising:

a plurality of mobile telephones and a base transceiver station providing an acquisition indication channel, in which

each mobile telephone obtains from the base station a plurality of available preamble signatures and stores said signatures;

during call set-up, a mobile transmits an access packet to the base station including one of said signatures,

characterized in that;

each active mobile monitors the acquisition indication channel for usage by other mobile telephones as available preamble signatures, and stores said usage; and

each mobile selects when required a signature the recorded usage of which is unlikely to cause collisions.