Method for synchronizing a radio communication system divided into radio cells

• US 7,941,166 B2
• Filed: 06/28/2004
• Issued: 05/10/2011
• Est. Priority Date: 07/10/2003
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Haas, Harald, Costa, Elena, Rohling, Hermann, Schulz, Egon, Meier, Niclas, Galda, Dirk
• Primary Examiner(s): Phan; Huy
• Assistant Examiner(s): AJIBADE AKONAI, OLUMIDE
• Application Number:
  US10/563,941
• Publication Number:
  US 20060198354A1
• Time in Patent Office: 2,507 Days
• Field of Search: 370/350, 370/319, 370/324, 370/330, 370/336, 370/337, 370/347, 370/321, 370/503, 370/328, 370/332, 370/508, 370/509, 370/510, 370/511, 370/512, 370/520, 455/503, 455/510, 455/443, 455/447, 455/502, 455/63.1, 455/67.11, 455/67.13, 455/450, 455/451, 455/452.1, 455/452.2, 455/444, 455/446
• US Class Current: 455/502
• 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;

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

determining, from the base station signals received at the mobile station, a second synchronizing value for at least one of time synchronizing and frequency synchronizing;

employing timeslots of commonly assigned carrier frequencies as radio transmission resources, 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

selecting the timeslot from the commonly assigned radio transmission resources taking account of an interference situation in the timeslot.

2. 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.

3. The method according to claim 1 , further comprising synchronizing by at least one of the base station and mobile station by adjusting carrier frequencies and timeslot-transmitting instants.

4. The method according to one claim 3, further comprising reducing co-channel interference on at least one of the base station and mobile station by interference suppression methods.

5. The method according to claim 4, further comprising assigning radio transmission resources on the base station side to minimize co-channel interference in adjacent radio cells.

6. The method according to claim 5, wherein an orthogonal frequency division multiplexing radio transmission method is employed.

7. The method according to claim 6 wherein one of a time-division duplex and frequency-division duplex radio transmission method is employed.

8. The method according to claim 6, 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.

9. The method according to claim 8, 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.

10. 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 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 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

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.

11. 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 means, 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 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.

12. A method for synchronizing a radio communication system divided into radio cells transmitting data using a multiple access method, comprising:

assigning each radio cell a respective base station for radio coverage of a plurality of mobile stations assigned to the radio cell;

utilizing time slots of jointly assigned carrier frequencies of adjacent base stations as radio transmission resources wherein two adjacent base stations simultaneously and jointly use a time slot of a carrier frequency for radio coverage of a mobile station;

receiving at the base station, signals from the adjacent base stations, and signals from the plurality of mobile stations in adjacent radio cells; and

determining from the signals from the adjacent base stations and the signals from the plurality of mobile stations in adjacent radio cells, a synchronization value for at least one of a time synchronization and a frequency synchronization.