Method of connecting an umts mobile radio to a network

• US 20050164723A1
• Filed: 05/19/2003
• Published: 07/28/2005
• Est. Priority Date: 05/23/2002
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Hertwig, Axel, Van Berkel, Cornelius Hermanus, Heinle, Frank, Meuwissen, Patrick Peter Elizabeth
• Granted Patent: US 7,684,832 B2
• Time in Patent Office: Days
• US Class Current: 455/502
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

To achieve a shortening of the initial synchronization time and/or extension of the stand-by time with a method of connecting an UMTS mobile radio to a network, the UMTS mobile radio receives and stored in one or more time-limited RF receive windows the signals that are subsequently evaluated when the HF receiver is switched off.

Claims

1. A method of connecting an UMTS mobile radio to a network, more particularly of shortening the initial synchronization time and/or extending the standby time of an UMTS mobile radio, the UMTS mobile radio, when its HF receiver is switched on, receiving signals from the base stations around it on various physical channels of the UMTS (Universal Mobile Telecommunication System), which signals are particularly used for initial synchronization, neighbor cell measurement and paging reception and occur in certain frames of the UMTS, characterized in that the signals lying in one or more RF receive windows are received by the UMTS mobile radio and storaed and after storage of the signals of the RF receive windows the HF receiver is switched off and in that, subsequently, when the HF receiver is switched off the stored signals are evaluated in the UMTS mobile radio.

2. A method as claimed in claim 1, characterized in that the RF receive window has at most the time length of the individual processing step that lasts longest.

3. A method as claimed in claim 1, characterized in that the RF receive window at most has the time length of one frame of the UMTS.

4. A method as claimed in claim 1, characterized in that the RF receive windows have a variable time lengt in dependence on the receive conditions.

5. A method as claimed in claim 1, characterized in that for an initial synchronization the HF receiver is switched on at a random instant and in that after a build-up time a frame of the UMTS signal from the base stations is received and stored.

6. A method as claimed in claim 1, characterized in that in the standby mode of the UMTS mobile radio the HF receiver is periodically switched on at defined instants to receive paging signals (PICH, PCH) and carry out a neighbor cell synchronization while the defined instants are shortly before the reception of the necessary PCH (paging channel) information.

7. A method as claimed in claim 1, characterized in that the PICH (paging indication channel) is ignored i.e. its information is not received and stored if the PCH (paging channel) is received and stored in the received frame.

8. A method as claimed in claim 1, characterized in that the moment when a measuring period in which particularly the neighbor cell measurement takes place longer than the paging period, the PCH is received and stored and evaluated only once per measuring period and otherwise in each paging period only the PICH is stored and evaluated.

9. A mobile radio that receives signals from the neighboring base stations when its HF receiver is switched on, which signals occur in certain frames, characterized in that the mobile radio receives and stores the signals situated in one or more RF receive windows and the HF receiver is switched off after the signals of the RF receive window or RF receive windows are stored and in that, subsequently the stored signals are evaluated in the mobile radio while the HF receiver is switched off.