Cell reselection signalling method
View Patent ↗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.
1. A method for channel reselection signaling in a cellular telecommunications network, the method comprising the steps of:
generating a connection rejection message; and
sending the connection rejection message from the cellular telecommunications network to a mobile station;
wherein the connection rejection message includes information relating to a value of at least one frequency parameter relating to connection setup for use in a new connection setup attempt.
2. The method of claim 1 , wherein said connection rejection message is a RRC CONNECTION REJECT message.
3. The method of claim 1 , wherein said information comprises information which relates to a preferred channel for a next connection attempt.
4. The method of claim 1 , wherein said information comprises information which relates to a reference time difference between a previously attempted connection to a channel and a preferred channel for a next connection attempt.
5. The method of claim 1 , wherein said information comprises information which relates to a primary CPICH channel.
6. The method of claim 1 , wherein said information comprises information which relates to a primary CCPCH channel.
7. The method of claim 1 , wherein said information comprises scrambling code information corresponding to a specific preferred channel.
8. The method of claim 1 , wherein said information comprises channel code information corresponding to a specific preferred channel.
9. The method of claim 1 , wherein said information comprises information which relates to a second cellular telecommunication network.
10. A channel reselection method in a mobile communication means of a cellular telecommunication system, the method comprising the steps of:
receiving a connection rejection message;
observing at least one parameter of said connection rejection message; and
setting a value of at least one parameter for a new connection setup attempt based at least in part on information in at least one frequency parameter of said connection rejection message.
11. The method of claim 10 , wherein said connection rejection message is a RRC CONNECTION REJECT message.
12. The method of claim 10 , wherein 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.
13. The method of claim 10 , further comprising the steps of:
setting a reception frequency based on the value of said at least one frequency parameter of said connection rejection message;
selecting a channel transmitting on said reception frequency; and
initialing a connection setup procedure.
14. The method of claim 10 , further comprising the steps of:
setting a reception frequency based on the value of said at least one frequency parameter of said connection rejection message;
setting a specific channel scrambling code based on the value of said at least one frequency parameter of said connection rejection message; and
initiating a connection setup procedure.
15. The method of claim 10 , further comprising the steps of:
setting a reception frequency based on the value of said at least one frequency parameter of said connection rejection message;
setting a specific channel code based on the value of said at least one frequency parameter of said connection rejection message; and
initiating a connection setup procedure.
16. The method of claim 15 , further comprising the step of:
setting a timing value based on the value of said at least one frequency parameter of said connection rejection message.
17. The method of claim 10 , further comprising the step of:
setting a reception frequency based on the value of said at least one frequency parameter of said connection rejection message.
18. The method of claim 10 , further comprising the step of:
setting a timing value based on the value of said at least one frequency parameter of said connection rejection message.
19. The method of claim 10 , further comprising the step of:
setting a scrambling code parameter based on the value of said at least one frequency parameter of said connection rejection message.
20. The method of claim 10 , further comprising the step of:
setting a channel code parameter based on the value of said at least one frequency parameter of said connection rejection message.
21. The method of claim 10 , further comprising the step of:
setting a parameter describing a specific primary CPICH channel based on the value of said at least one frequency parameter of said connection rejection message.
22. The method of claim 10 , further comprising the step of:
setting a parameter describing a specific primary CCPCH channel based on the value of a said at least one frequency parameter of said connection rejection message.
23. The method of claim 10 , further comprising the step of:
setting a parameter identifying a second cellular telecommunication network based on the value of said at least one frequency parameter of said connection rejection message.
24. The method of claim 11 , further comprising the step of:
starting the new connection attempt based at least on the value the said at least one frequency parameter of said connection rejection message.
25. A network element of a cellular telecommunications network, wherein the network element is configured to indicate, in a connection rejection message to a mobile station, information which relates to a value of at least one frequency parameter relating to connection setup for use in a new connection setup attempt.
26. The network element of claim 25 , wherein the network element is an element of a radio access network of a cellular telecommunications network.
27. The network element of claim 25 , wherein the network element is a radio network controller.
28. The network element of claim 25 , wherein said connection rejection message is a RRC CONNECTION REJECT message.
29. The network element of claim 25 , wherein said information comprises information which relates to a preferred channel for a next connection attempt.
30. The network element of claim 25 , wherein said information comprises information which relates to a reference time difference between a previously attempted channel and a preferred channel for a next connection attempt.
31. The network element of claim 25 , wherein said information comprises information which relates to a primary CPICH channel.
32. The network element of claim 25 , wherein said information comprises information which relates to a primary CCPCH channel.
33. The network element of claim 25 , wherein said information comprises scrambling code information corresponding to a specific preferred channel.
34. The network element of claim 25 , wherein said information comprises channel code information corresponding to a specific preferred channel.
35. The network element of claim 25 , wherein said information comprises information which relates to a second cellular telecommunication network.