Method for synchronizing a mobile station to a base station

1. A method for synchronizing a mobile station to a base station,

wherein the base station is a fixed part of a Digital Enhanced Cordless Telecommunications (DECT) system and the mobile station is a portable part of a DECT system, comprising, in the base station:

generating an information indicating a frequency of a channel which is used to transmit data about an identity of the base station, the generating of the information depending on a Received Signal Strength Indication (RSSI) measurement; and

transmitting the information indicating the frequency from the base station to the mobile station in a B field of a DECT dummy bearer.

2. The method according to claim 1 , wherein the information is transmitted using the channel which is used to transmit data about the identity of the base station.

3. The method according to claim 1 , wherein generating the information depends on determining a channel having a lowest signal strength.

4. The method according to claim 1 , further comprising:

ordering information about frequencies according to increasing signal strengths of corresponding frequency channels.

5. A method for synchronizing a mobile station to a base station,

wherein the base station is a fixed part of a Digital Enhanced Cordless Telecommunications (DECT) system and the mobile station is a portable part of a DECT system, comprising, in the mobile station:

reading an information indicating frequencies of a channel received in a B field of a DECT dummy bearer, wherein the information has been transmitted from the base station to the mobile station, and the information depends on a Received Signal Strength Indication (RSSI) measurement; and

searching for a frequency channel with a dummy bearer that has an identity of a base station using the read information indicating the frequencies, thereby initiating the synchronizing.

6. The method according to claim 5 , wherein the information is read during a wake-up phase of the mobile station.

7. The method according to claim 5 , further comprising:

storing the information in the base station and/or the mobile station.

8. The method according to claim 7 , further comprising:

updating the stored information in the mobile station during a wake-up phase of the mobile station.

9. The method according to claim 5 , wherein the synchronizing is initiated by the mobile station upon searching for the dummy bearer; and the base station is in an active mode at a start of the initiation.

10. A base station comprising:

a first unit to generate an information indicating a frequency of a channel which is used to transmit data about an identity of the base station, the information depending on a Received Signal Strength Indication (RSSI) measurement; and

a second unit to transmit the information indicating the frequency from the base station to a mobile station in a B field of a DECT dummy bearer, wherein the base station is a fixed part of a Digital Enhanced Cordless Telecommunications (DECT) system and the mobile station is a portable part of the DECT system.

11. A mobile station,

wherein the mobile station is a portable part of a Digital Enhanced Cordless Telecommunications (DECT) system,

the mobile station comprising:

a first unit to read an information indicating frequencies of a channel received in a B field of a DECT dummy bearer, wherein the information indicating the frequencies has been transmitted from a base station of the DECT system to the mobile station, and the information depends on a Received Signal Strength Indication (RSSI) measurement; and

a second unit to search for a frequency channel with a dummy bearer that has an identity of a base station using the read information indicating the frequencies to thereby initiate a synchronizing of the mobile station to the base station.

12. The method according to claim 1 , further comprising synchronizing between the base station and the mobile station after a loss of synchronization upon the second unit searching for the dummy bearer using the read information.

13. The method according to claim 5 , further comprising synchronizing between the base station and the mobile station after a loss of synchronization using the information.

14. The method according to claim 1 , further comprising transmitting information about a prospective change of the frequency to the mobile station.

15. The method according to claim 5 , further comprising receiving information about a prospective change of the frequency to the mobile station.

16. The method according to claim 1 , further comprising then generating and transmitting a further information indicating a further frequency of a channel usable for transmitting data about the identity of the base station.

17. The method according to claim 5 , further comprising then receiving a further information indicating a further frequency of a channel usable for transmitting data about the identity of the base station.

18. The method according to claim 1 , further comprising repeating the generating of information indicating a channel frequency based on the RSSI measurement and the transmitting in time intervals.

19. The base station according to claim 10 ,

wherein the first unit is to repeat the generating of information indicating a channel frequency based on the RSSI measurement in time intervals, and

wherein the second unit is to repeat the transmitting in time intervals.