IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0296618
(2001-04-26)
|
등록번호 |
US-7408916
(2008-08-05)
|
우선권정보 |
FI-20001298(2000-05-30) |
국제출원번호 |
PCT/FI01/000400
(2001-04-26)
|
§371/§102 date |
20030409
(20030409)
|
국제공개번호 |
WO01/093460
(2001-12-06)
|
발명자
/ 주소 |
- Kassinen,Juha P.
- Parkkinen,Jari
- Niemela,Kari
- Annala,Heikki
- Melero,Juan
|
출원인 / 주소 |
|
대리인 / 주소 |
Squire, Sanders & Dempsey, L.L.P.
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
6 |
초록
▼
The invention concerns a method for synchronising clocks of base transceiver stations in a telecommunications system and a mobile communications system. According to the invention, in either some or in all base station sites of the telecommunications network a location measurement unit is installed,
The invention concerns a method for synchronising clocks of base transceiver stations in a telecommunications system and a mobile communications system. According to the invention, in either some or in all base station sites of the telecommunications network a location measurement unit is installed, which receives an accurate clock including an extra-system signal. The clock information is transmitted further to base transceiver stations, whose frame transmissions are synchronised in accordance with the clock information. By using the implementation in accordance with the invention both economic and functional advantages are achieved, e.g. the capacity can be increased by up to 50-300%, depending on the manner of implementation.
대표청구항
▼
The invention claimed is: 1. Method of synchronizing base transceiver stations in a mobile communications network, said method comprising: receiving a signal including an external system accurate clock; measuring a real time difference (RTD) of broadcast signals from at least one base transceiver s
The invention claimed is: 1. Method of synchronizing base transceiver stations in a mobile communications network, said method comprising: receiving a signal including an external system accurate clock; measuring a real time difference (RTD) of broadcast signals from at least one base transceiver station and from at least one adjacent base transceiver station; transmitting the measured RTD, whereby the base transceiver stations are synchronized in accordance with the measured RTD; providing a frame clock and a base station frame number within the clock information transmitted by the location measurement unit to the at least one base transceiver; and defining the frame clock with the aid of the external clock. 2. The method as defined in claim 1, further comprising: providing a plurality of base transceiver stations; connecting together said plurality of base transceiver stations to form chained based transceiver stations; operating the location measurement unit as a master clock of the chained base transceiver stations; and synchronizing the chained base transceiver stations with identical clock information. 3. Method of synchronizing base transceiver stations, the method comprising: receiving a signal including an external system accurate clock; transmitting a clock information of the signal to a base transceiver station of at least one base station site; synchronizing the base transceiver station in accordance with the clock information; determining whether the at least one base station includes an inoperative location measurement unit; synchronizing the base transceiver station of the inoperative measurement unit using a location measurement unit from an adjacent base station site; providing a frame clock and a base station frame number within the clock information transmitted by the location measurement unit to the at least one base transceiver; and defining the frame clock with the aid of the external clock. 4. The method as defined in claim 3, further comprising: transmitting the clock information to a location calculation unit. 5. The method as defined in claim 4, further comprising: receiving, at the location measurement unit, frames transmitted by the at least one base transceiver station; attaching to the frames a time stamp based upon the external system accurate clock; and transmitting the time stamped frames together with the clock information. 6. The method as defined in claim 5, further comprising: transmitting the clock information and the time stamped frames from the at least one base transceiver station to the location calculation unit. 7. The method as defined in claim 6, further comprising: reporting a real time difference from the location calculation unit to a base station controller, wherein the base transceiver station controller manages and control a clock phasing of the at least one base station transceiver station having no location management unit; and transmitting a clock tuning value from the location calculation unit to the at least one base transceiver station having no location management unit. 8. The method as defined in claim 4, further comprising: locating the location calculation unit in a base station system. 9. The method as defined in claim 3, further comprising: receiving, at the location measurement unit, the clock information including the external accurate clock transmitted from a satellite orbiting the earth. 10. The method as defined in claim 3, further comprising: providing the location measurement unit as a component within the at least one base transceiver station. 11. The method as defined in claim 3, further comprising: providing the location measurement unit as a separate component in the at least one base station. 12. A mobile communications system comprising: a plurality of mobile stations connected to at least one base station site; the at least one base station site including at least one base transceiver station having radio interface, wherein said radio interface having a frame structure formed by transmission frames and reception frames; a base station controller for controlling the frame transmissions of the at least one base transceiver stations; a location measurement unit connected to the at least one base transceiver station; wherein the location measurement unit includes a receiver for receiving an external system accurate clock, a reception device for receiving the transmission frames of the base transceiver station of at least one adjacent base station site, and a processor for processing clock information and the transmission frames and for transmitting the clock information and the transmission frames to the base transceiver; and a frame clock and a base station frame number within the clock information transmitted by the location measurement unit to the at the least one base transceiver station, wherein the frame clock is defined with the aid of the external clock. 13. A mobile communications system comprising: a receiver configured to receive a signal including an external system accurate clock; a location measurement unit configured to measure a real time difference (RTD) of broadcast signals from at least one base transceiver station and from at least one adjacent base transceiver station; a transmitter configured to transmit the measured RTD, whereby the base transceiver stations are synchronized in accordance with the measured and a frame clock and a base station frame number within the clock information transmitted by the location measurement unit to the at the least one base transceiver station, wherein the frame clock is defined with the aid of the external clock. 14. A mobile communications system comprising: a receiver configured to receive a signal including an external system accurate clock; a transmitter configured to transmit a clock information of the signal to a base transceiver station of at least one base station site; a first synchronizer configured to synchronize the base transceiver station in accordance with the clock information; a controller configured to determine whether the at least one base station includes an inoperative location measurement unit; a second synchronizer configured to synchronize the base transceiver station of the inoperative measurement unit using an location measurement unit from an adjacent base station site; and a frame clock and a base station frame number within the clock information transmitted by the location measurement unit to the base transceiver station, wherein the frame clock is defined with the aid of the external clock. 15. A location measurement apparatus, comprising: a receiver configured to receive a signal including an external system accurate clock; a measurement unit configured to measure a real time difference of broadcast signals from at least one base transceiver station and from at least one adjacent base transceiver station; a transmitter configured to transmit the measured real time difference, wherein the base transceiver stations are synchronized in accordance with the measured RTD; and a frame clock and a base station frame number within the clock information transmitted by the measurement unit to the at least base transceiver station, wherein the frame clock is defined with the aid of an external clock. 16. An apparatus, comprising: a transmitter configured to transmit a measured real time difference of broadcast signals from at least one base transceiver station and from at least one adjacent base transceiver station, wherein the base transceiver stations are synchronized in accordance with the measured real time difference; and a frame clock and a base station frame number within the clock information transmitted by a location measurement unit to the at the least one base transceiver station, wherein the frame clock is defined with the aid of an external clock. 17. An apparatus, comprising: a receiver configured to receive a signal including an external system accurate clock; a location measurement unit configured to measure a real time difference of broadcast signals from two adjacent base transceiver stations; and a frame clock and a base station frame number within the clock information transmitted by a location measurement unit to at least one of the base transceiver stations, wherein the frame clock is defined with the aid of the external clock.
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