Method for synchronization in a mobile radio terminal

• US 7,917,113 B2
• Filed: 04/05/2004
• Issued: 03/29/2011
• Est. Priority Date: 04/11/2003
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Palenius, Torgny, Olofsson, Patrik, Östberg, Christer, Hokfelt, Johan, Wichert, Jan, Ewald, Richard, Palm, H{dot over (a)}kan, Nilsson, Mikael
• Primary Examiner(s): Corsaro; Nick
• Assistant Examiner(s): DONADO, FRANK E
• Application Number:
  US10/553,082
• Publication Number:
  US 20070037594A1
• Time in Patent Office: 2,549 Days
• Field of Search: 455/552
• US Class Current: 455/208
• CPC Class Codes: H04B 17/309 Measuring or estimating channel quality parameters
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04B 17/327 Received signal code power [RSCP]
• CPC Class Codes: H04B 17/336 Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
• CPC Class Codes: H04B 17/382 for resource allocation, admission control or handover
• CPC Class Codes: H04B 7/2668 Arrangements for Wireless Code-Division Multiple Access [CDMA] System Synchronisation, for code acquisition H04B1/7075, for code tracking H04B1/7085
• CPC Class Codes: H04W 36/0088 Scheduling hand-off measurements
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface
• CPC Class Codes: H04W 36/304 due to measured or perceived resources with higher communication quality
• CPC Class Codes: H04W 56/001 Synchronization between nodes
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
• CPC Class Codes: H04W 92/02 Inter-networking arrangements

Abstract

A method for synchronizing measurements in a mobile communication apparatus having a first active radio access means (100) adapted to communicate according to a first radio access technology (RAT) and at least a second passive radio access means (200) adapted to communicate according to a second RAT. A time reference common to the first and the second access means (100) is generated. At least one time schedule is obtained, said schedule indicating at least one time gap wherein the second access means (200) is allowed to be active. The activation time of the schedule is based on the common time reference. An arrangement adapted to generate the common time reference and the time schedule is also disclosed.

Claims

1. A method for internally synchronizing cell measurements in a mobile communication apparatus having a first active radio access means adapted to communicate according to a first radio access technology (RAT) and a second passive radio access means adapted to communicate according to a second RAT, comprising the steps of:

the mobile communication apparatus performs the following steps;

generating a common time event (CTE) upon issuance of a request to initiate the cell measurements;

generating a time reference common to the first and the second radio access means by registering counter values from a first and second counter provided in the first and the second radio access means respectively in response to the CTE;

obtaining, by said first radio access means, a measurement gap schedule including a time schedule in a time format of said first radio access means, said time schedule indicating a time gap during which the second radio access means is allowed to be active and not interrupt communications of the first radio access means, said measurement gap schedule includes an activation time of the time schedule where the activation time is determined in the time format of said first radio access means and the activation time is determined based on a time distance from the CTE;

forwarding said measurement gap schedule to said second radio access means; and

translating said measurement gap schedule by said second radio access means using the time reference of the registered counter value in the second counter to determine the activation time in a time format of said second access means.

2. The method according to claim 1, wherein the CTE is a hardware supported interrupt.

3. The method according to claim 1, wherein a current connection frame number, current slot, and current chip are registered by the first radio access means in response to the CTE.

4. The method according to claim 1, wherein a current frame number in a GSM multiframe structure, and a position within the frame is registered by the second radio access means in response to the CTE.

5. The method according to claim 1, wherein the time schedule is obtained based on information received from a first communication network to which the first radio access means is coupled.

6. The method according to claim 5, wherein the received information comprises configuration data specifying gaps, in which the second radio access means is allowed to be active.

7. The method according to claim 5, wherein the received information comprises setup or reconfiguration information, and the first radio access means obtains the gaps based on stored and received data.

8. The method according to claim 1, wherein the duration of the time gap, and the distance between the common time reference and the time gap, are given in the time schedule.

9. The method according to claim 1, wherein several time gaps are determined in the time schedule, and the distance between each of the time gaps is specified in the time schedule.

10. The method according to claim 1, wherein a delay between channel timing and the counter of the first radio access means is taken into account when determining the activation time of the time schedule.

11. The method according to claim 1, wherein the time schedule is utilized by the second radio access means to provide cell measurements.

29. The method according to claim 1, wherein the request to initiate the cell measurement is issued when the mobile communication apparatus experiences a certain link quality with base stations associated with the first radio access technology and the second radio access technology.

30. The method according to claim 1, wherein the request to initiate the cell measurement is a measurement configuration request received from a base station associated with the first radio access technology.

12. A mobile communication apparatus for internally synchronizing cell measurements, comprising:

a first active radio access means comprising a first transceiver means for communicating with a first communication network the first transceiver means being adapted to communicate according to a first radio access technology;

a second passive radio access means comprising a second transceiver means for communicating with a second communication network, the second transceiver means being adapted to communicate according to a second radio access technology;

a timing generator means for generating a common time event (CTE) upon issuance of a request to initiate the cell measurements;

a time reference generating means for generating a time reference common to the first radio access means and the second radio access means by registering counter values from a first and second counter means provided in the first and the second radio access means respectively in response to the CTE;

a time schedule generating means in the first radio access means for obtaining a measurement gap schedule including a time schedule in a time format of the first radio access means, the time schedule indicating at least one time gap during which the second radio access means is allowed to be active and not interrupt communications of the first radio access means, said measurement gap schedule includes an activation time of the time schedule where the activation time is determined in the time format of said first radio access means and the activation time is determined based on a time distance from the CTE;

means for forwarding the measurement gap schedule to the second radio access means; and

means on the second access means for translating the measurement gap schedule using the time reference of the registered counter value in the second counter means to determine the activation time in a time format of the second radio access means.

13. The mobile communication apparatus according to claim 12, wherein the time reference generating means comprises a first and second counter synchronize mechanism provided in the first and second radio access means, respectively;

one of the counter synchronize mechanisms being adapted to generate an interrupt;

wherein the interrupt is the CTE;

the other counter synchronize mechanism adapted to receive the interrupt.

14. The mobile communication apparatus according to claim 13, wherein either or both of the counter synchronize mechanisms are adapted to write a bit onto a connection to the other, the bit being the interrupt.

15. The mobile communication apparatus according to claim 14, wherein the time reference generating means comprises first and second counter means and first and second counter value register means provided in the first and second radio access means, respectively.

16. The mobile communication apparatus according to claim 15, wherein the counter of the first radio access means, in operation, is adapted to generate current connection frame number, current slot, and current chip, which the time reference generating means is adapted to store in the first counter value register means in response to the CTE.

17. The mobile communication apparatus according to claim 15, wherein the counter of the second radio access means is adapted to generate a current frame number in GSM multiframe structure, and a position within the frame, which the time reference generating means is adapted to store in the second counter value register means in response to the CTE.

18. The mobile communication apparatus according to claim 12, wherein the time schedule generating means is adapted to obtain the time schedule based on stored information and data received from the first communication network during operation.

19. The mobile communication apparatus according to claim 12, wherein the time schedule generating means is adapted to incorporate into the time schedule parameters that identify the duration of the time gap, and the distance between the common time reference and the at least one time gap.

20. The mobile communication apparatus according to claim 12, wherein the time schedule generating means is adapted to incorporate into the time schedule a plurality of time gaps, and to specify the distance between each of the plurality of time gaps in the time schedule.

21. The mobile communication apparatus according to claim 12, wherein the second radio access means is adapted to provide cell measurements during the time gaps given in the time schedule, and wherein the first access radio means is adapted to be passive.

22. The mobile communication apparatus according to claim 12, wherein the first radio access technology is WCDMA (Wideband Code Division Multiple Access).

23. The mobile communication apparatus according to claim 12, wherein the second access technology is GSM (Global System for Mobile communication).

24. The mobile communication apparatus according to claim 12, wherein the first and second radio access means have at least one common radio resource.

25. The mobile communication apparatus according to claim 24, wherein the common radio resource is an antenna.

26. The mobile communication apparatus according to claim 12, further comprising:

a mobile terminal operable within the first radio access technology and second radio access technology;

the mobile terminal having digital computer capabilities;

a computer program product embodied on a computer readable memory of the mobile terminal having software code portions for generating a time reference common to the first and the second radio access means;

obtaining at least one time schedule, the time schedule indicating the time gap during which the second radio access means is allowed to be active; and

determining the activation time of the time schedule based on the common time reference.

27. The arrangement according claim 12, adapted for use in a wireless communication apparatus.

28. The mobile communication apparatus according to claim 27, wherein the mobile communication apparatus is one from the group consisting of a mobile radio terminal, a mobile telephone, a pager and a communicator.