Method for synchronizing radio communication system divided into radio cells

• US 7,953,066 B2
• Filed: 07/20/2009
• Issued: 05/31/2011
• Est. Priority Date: 07/10/2003
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Meier, Niclas, Haas, Harald, Costa, Elena, Rohling, Hermann, Schulz, Egon, Galda, Dirk
• Primary Examiner(s): AJIBADE AKONAI, OLUMIDE
• Application Number:
  US12/458,668
• Publication Number:
  US 20090279531A1
• Time in Patent Office: 680 Days
• Field of Search: 455/502, 455/63.1, 455/562.1, 455/67.13, 455/443, 455/444, 455/447, 455/501, 455/550.1, 455/561, 370/338, 370/350, 370503-512, 370/520
• US Class Current: 370/350
• CPC Class Codes: H04B 7/2625 using common wave
• CPC Class Codes: H04B 7/2687 Inter base stations synchronisation

Abstract

Data is transmitted via time division multiple access methods and every radio cell includes one base station each for the radio coverage of a plurality of mobile stations assigned to the radio cell. The base station receives, in addition to mobile station signals of its own radio cell, mobile station signals of neighboring radio cells and determines, on the basis of the mobile station signals received, a time synchronization value and/or a frequency synchronization value to which the base station synchronizes itself.

Claims

1. A method for synchronizing a radio communication system divided into radio cells transmitting data by multiple access methods, each radio cell having a base station for radio provisioning mobile stations assigned to the radio cell, comprising:

receiving, at the base station of a radio cell, mobile station signals of the radio cell and adjacent radio cells;

determining, from the mobile station signals received at the base station, a first synchronizing value for at least one of time synchronizing and frequency synchronizing to which the base station synchronizes itself.

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

receiving, at a mobile station of the radio cell, base station signals of the radio cell and adjacent radio cells; and

determining, from the base station signals received at the mobile station, a further synchronizing value for at least one of time synchronizing and frequency synchronizing to which the mobile station synchronizes itself.

3. The method according to claim 1, wherein adjacent base stations employ radio transmission resources from a stock commonly assigned to the base stations for data transmission.

4. The method according to claim 3, wherein the base stations employ timeslots of commonly assigned carrier frequencies as radio transmission resources.

5. The method according to claim 4, wherein at least two adjacent base stations simultaneously and jointly employ a timeslot of a carrier frequency for radio provisioning a respectively assigned mobile station, and further comprising selecting the timeslot from the commonly assigned radio transmission resources taking account of an interference situation in the timeslot.

6. The method according to claim 1, wherein for the synchronizing at least one of the base station and mobile station adjusts employed carrier frequencies and timeslot- transmitting instants.

7. The method according to claim 1, further comprising reducing co-channel interference on at least one of the base station and mobile station by interference suppression methods.

8. The method according to claim 1, further comprising assigning radio transmission resources on the base station side to minimize co-channel interference in adjacent radio cells.

9. The method according to claim 1, wherein an orthogonal frequency division multiplexing radio transmission method is employed.

10. The method according to claim 9, further comprising determining one of a time deviation through correlating and a frequency deviation by ascertaining a phase rotation of consecutive symbols following a transformation into the frequency range.

11. The method according to claim 1, wherein one of a time-division duplex and frequency-division duplex radio transmission method is employed.

12. The method according to claim 1, wherein said synchronizing of the base station and the mobile station of the radio communication system requires no additional signaling using a higher protocol layer between the base station and assigned mobile station.

13. A base station, in a radio cell of a radio communication system divided into radio cells transmitting data by multiple access methods, for radio provisioning mobile stations assigned to the radio cell, comprising:

a receiver receiving mobile station signals of the radio cell and adjacent radio cells; and

a processor determining from the mobile station signals, a synchronizing value for at least one of time synchronizing and frequency synchronizing to which said base station synchronizes itself.

14. A method for synchronizing a radio communication system divided into radio cells transmitting data by multiple access methods, each radio cell having a base station for radio provisioning mobile stations assigned to the radio cell, comprising:

receiving, at a mobile station of the radio cell, base station signals of the radio cell and adjacent radio cells; and

determining, from the base station signals received at the mobile station, a further synchronizing value for at least one of time synchronizing and frequency synchronizing to which the mobile station synchronizes itself.

15. The method according to claim 14, wherein adjacent base stations employ radio transmission resources from a stock commonly assigned to the base stations for data transmission.

16. The method according to claim 15, wherein the base stations employ timeslots of commonly assigned carrier frequencies as radio transmission resources.

17. The method according to claim 16, wherein at least two adjacent base stations simultaneously and jointly employ a timeslot of a carrier frequency for radio provisioning a respectively assigned mobile station, and further comprising selecting the timeslot from the commonly assigned radio transmission resources taking account of an interference situation in the timeslot.

18. The method according to claim 14, wherein for the synchronizing at least one of the base station and mobile station adjusts employed carrier frequencies and timeslot-transmitting instants.

19. The method according to claim 14, further comprising reducing co-channel interference on at least one of the base station and mobile station by interference suppression methods.

20. The method according to claim 14, further comprising assigning radio transmission resources on the base station side to minimize co-channel interference in adjacent radio cells.

21. The method according to claim 14, wherein an orthogonal frequency division multiplexing radio transmission method is employed.

22. The method according to claim 21, further comprising determining one of a time deviation through correlating and a frequency deviation by ascertaining a phase rotation of consecutive symbols following a transformation into the frequency range.

23. The method according to claim 14, wherein one of a time-division duplex and frequency-division duplex radio transmission method is employed.

24. The method according to claim 14, wherein said synchronizing of the base station and the mobile station of the radio communication system requires no additional signaling using a higher protocol layer between the base station and assigned mobile station.

25. A radio communication system divided into radio cells transmitting data by multiple access methods, each radio cell having a base station for radio provisioning mobile stations assigned to the radio cell, comprising:

at least one base station, each assigned to a corresponding radio cell, receiving mobile station signals of the corresponding radio cell and adjacent radio cells and determining, from the mobile station signals, a synchronizing value for at least one of time synchronizing and frequency synchronizing of the at least one base station.

26. A mobile station, in a radio cell of a radio communication system divided into radio cells transmitting data by multiple access methods, each radio cell having a base station for radio provisioning mobile stations assigned to the radio cell, comprising:

a receiver receiving base station signals of the radio cell and adjacent radio cells and utilizing time slots of jointly assigned carrier frequencies of an adjacent base station as radio transmission resources wherein the base station and the adjacent base station simultaneously and jointly employ a time slot of a carrier frequency for radio provisioning of the mobile station, and selecting the time slot from the commonly assigned radio transmission resources taking account of an interference situation in the time slot; and

a processor determining from the base station signals, a synchronizing value for at least one of time synchronizing and frequency synchronizing to which said mobile station synchronizes itself.

27. A radio communication system divided into radio cells transmitting data by multiple access methods, each radio cell having a base station for radio provisioning mobile stations assigned to the radio cell, comprising:

a time slot unit assigned to a corresponding radio cell, assigning time slots of jointly assigned carrier frequencies of an adjacent base station as radio transmission resources wherein the base station and the adjacent base station simultaneously and jointly employ a time slot of a carrier frequency for radio provisioning of a mobile station, and selecting the time slot from the commonly assigned radio transmission resources taking account of an interference situation in the time slot; and

at least one mobile station, each in a corresponding radio cell, receiving base station signals of the corresponding radio cell and adjacent radio cells and determining, from the base station signals, a synchronizing value for at least one of time synchronizing and frequency synchronizing of the at least one mobile station.