Cell reselection signalling method

• US 20030003928A1
• Filed: 07/12/2002
• Published: 01/02/2003
• Est. Priority Date: 01/17/2000
• Status: Active Grant

• Current Assignee: Sisvel International S.A. (Fineur International S.A.)
• Original Assignee: Nokia Corporation
• Inventors: Marjelund, Pekka, Salonaho, Oscar, Turunen, Juha, Iisakkila, Kaisu
• Granted Patent: US 7,433,698 B2
• Time in Patent Office: Days
• US Class Current: 455/464
• CPC Class Codes: H04W 36/0055 Transmission or use of information for re-establishing the radio link

Abstract

The invention relates to methods pertaining to cell reselection in a cellular telecommunication system. According to the invention, a connection setup rejection message is used to direct a mobile communication means to attempt a new connection with certain parameter values such as a certain carrier frequency. A plurality of parameter values may as well be indicated in the message, which allows the network to direct the mobile communication means to make a connection setup request to a specific cell, for example. The connection setup rejection message can be for example the CONNECTION SETUP REJECT message of the RRC protocol.

Claims

1. Channel reselection signalling method in a cellular telecommunications network, characterized in that in the method the network indicates in a connection rejection message to a mobile station information about the value of at least one parameter relating to connection setup for use in a new connection setup attempt.

2. A method according to claim 1, characterized in that said connection rejection message is RRC CONNECTION REJECT message.

3. A method according to claim 1, characterized in that said information comprises information about a preferred channel for the next connection attempt.

4. A method according to claim 1, characterized in that said information comprises frequency information.

5. A method according to claim 1, characterized in that said information comprises information about reference time difference between the previously attempted channel and the preferred channel for the next attempt.

6. A method according to claim 1, characterized in that said information comprises information about a primary CPICH channel.

7. A method according to claim 1, characterized in that said information comprises information about a primary CCPCH channel.

8. A method according to claim 1, characterized in that said information comprises scrambling code information corresponding to a certain preferred channel.

9. A method according to claim 1, characterized in that said information comprises channel code information corresponding to a certain preferred channel.

10. A method according to claim 1, characterized in that said information comprises information about a second cellular telecommunication network.

11. A channel reselection method in a mobile communication means of a cellular telecommunication system, characterized in that the method comprises the steps of

receiving of a connection rejection message,

observing at least one parameter of said connection rejection message, and

setting the value of at least one parameter for a new connection attempt at least in part on the basis of information in at least one parameter of said connection rejection message.

12. A method according to claim 11, characterized in that said connection rejection message is a RRC CONNECTION REJECT message.

13. A method according to claim 11, characterized in that if a predetermined parameter of said connection rejection message has a predetermined value, the value of at least one parameter for a new connection attempt is obtained from a system information message.

14. A method according to claim 11, characterized in that the method further comprises steps of

setting of a reception frequency on the basis of the value of a parameter of said connection rejection message,

selecting of a channel transmitting on said reception frequency, and

initiating a connection setup procedure.

15. A method according to claim 11, characterized in that the method further comprises the steps of

setting of a reception frequency on the basis of the value of a parameter of said connection rejection message,

setting a specific channel scrambling code on the basis of the value of a parameter of said connection rejection message, and

initiating a connection setup procedure.

16. A method according to claim 11, characterized in that the method further comprises the steps of

setting of a reception frequency on the basis of the value of a parameter of said connection rejection message,

setting a specific channel code on the basis of the value of a parameter of said connection rejection message, and

initiating a connection setup procedure.

17. A method according to claim 16, characterized in that the method further comprises the step of setting of a timing value on the basis of the value of a parameter of said connection rejection message.

18. A method according to claim 11, characterized in that the method further comprises the step of setting of a reception frequency on the basis of the value of a parameter of said connection rejection message

19. A method according to claim 11, characterized in that the method further comprises the step of setting of a timing value on the basis of the value of a parameter of said connection rejection message.

20. A method according to claim 11, characterized in that the method further comprises the step of setting of a scrambling code parameter on the basis of the value of a parameter of said connection rejection message.

21. A method according to claim 11, characterized in that the method further comprises the step of setting of a channel code parameter on the basis of the value of a parameter of said connection rejection message.

22. A method according to claim 11, characterized in that the method further comprises the step of setting of a parameter describing a certain primary CPICH channel on the basis of the value of a parameter of said connection rejection message.

23. A method according to claim 11, characterized in that the method further comprises the step of setting of a parameter describing a certain primary CCPCH channel on the basis of the value of a parameter of said connection rejection message.

24. A method according to claim 11, characterized in that the method further comprises the step of setting of a parameter identifying a second cellular telecommunication network on the basis of the value of a parameter of said connection rejection message.

25. A method according to claim 12, characterized in that the method further comprises the step of starting a new connection attempt at least partly according to the value of the parameter of said connection rejection message.

27. A network element according to claim 26, characterized in that the network element is a network element of a radio access network of a cellular telecommunications network.

28. A network element according to claim 26, characterized in that the network element is a radio network controller.

29. A network element according to claim 26, characterized in that said connection rejection message is RRC CONNECTION REJECT message.

30. A network element according to claim 26, characterized in that said information comprises information about a preferred channel for the next connection attempt.

31. A network element according to claim 26, characterized in that said information comprises frequency information.

32. A network element according to claim 26, characterized in that said information comprises information about reference time difference between the previously attempted channel and the preferred channel for the next attempt.

33. A network element according to claim 26, characterized in that said information comprises information about a primary CPICH channel.

34. A network element according to claim 26, characterized in that said information comprises information about a primary CCPCH channel.

35. A network element according to claim 26, characterized in that said information comprises scrambling code information corresponding to a certain preferred channel.

36. A network element according to claim 26, characterized in that said information comprises channel code information corresponding to a certain preferred channel.

37. A network element according to claim 26, characterized in that said information comprises information about a second cellular telecommunication network.

26. A network element of a cellular telecommunications network, characterized in that the network element is arranged to indicate in a connection rejection message to a mobile station information about the value of at least one parameter relating to connection setup for use in a new connection setup attempt.