Making measurements on parallel frequencies in a radio communications device
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04B-001/69
H04L-027/06
출원번호
US-0424623
(1998-05-29)
우선권정보
FI-972299(1997-05-30)
국제출원번호
PCT/FI98/000460
(1998-05-29)
§371/§102 date
20000327
(20000327)
국제공개번호
WO98/054849
(1998-12-03)
발명자
/ 주소
Toskala,Antti
Holma,Harri
H채m채l채inen,Seppo
출원인 / 주소
Nokia Mobile Phones Ltd.
대리인 / 주소
Perman &
인용정보
피인용 횟수 :
3인용 특허 :
13
초록▼
A diversity receiver in a radio apparatus has at least two reception branches and a RAKE receiver to combine signal received by the different reception branches as well as a measuring receiver to make frequency specific measurements. The radio apparatus includes a switch connected with at least one
A diversity receiver in a radio apparatus has at least two reception branches and a RAKE receiver to combine signal received by the different reception branches as well as a measuring receiver to make frequency specific measurements. The radio apparatus includes a switch connected with at least one reception branch and has at least two states in the first of which the switch is arranged to direct a signal received by a reception branch to the RAKE receiver and in the second of which the switch is arranged to direct a signal received by a reception branch to the measuring receiver. The radio apparatus makes measurements at other than the operating frequency without the reception at the operating frequency being interrupted. In a communications system the measurements may be associated with a handover.
대표청구항▼
What is claimed is: 1. A radio apparatus (50) comprising a diversity receiver which has a first reception branch (12; 40) and a second reception branch (13; 41), a RAKE receiver (14) comprising correlator branches (14a, 14b, 14c, 14 d) for combining received signal components on baseband frequency,
What is claimed is: 1. A radio apparatus (50) comprising a diversity receiver which has a first reception branch (12; 40) and a second reception branch (13; 41), a RAKE receiver (14) comprising correlator branches (14a, 14b, 14c, 14 d) for combining received signal components on baseband frequency, a measuring receiver (14e; 16) for making measurements, characterized in that the radio apparatus is arranged so as to tune the first reception branch (12; 40) to a different frequency than the second reception branch (13; 41) and to make measurements of a signal produced by one reception branch simultaneously with the reception of a signal produced by the other reception branch, and a reception branch having a switch (15; 31) which has at least two states (15a, 15b), in the first state the switch is arranged so as to direct the signal received by said reception branch having the switch to said RAKE receiver (14), and in the second state switch is arranged so as to direct the signal received by said reception branch having the switch to said measuring receiver (14e; 16). 2. The radio apparatus of claim 1, characterized in that said reception branch having the switch comprises, successively in the direction of the flow of the received signal: an RF filter and amplifier (26), a first mixer (27) for IF conversion, an IF filter, and a second mixer (28) for baseband conversion, so that said switch (15) is located after said second mixer in the direction of the flow of the received signal. 3. The radio apparatus of claim 1, characterized in that said reception branch having the switch comprises: an RF filter and amplifier (26), a first mixer (32) for IF conversion, a first IF filter (34), a second mixer (34) for baseband conversion, a third mixer (33) for IF conversion, a second IF filter (35), and a fourth mixer (35) for baseband conversion, so that said switch (31) is located between said RF filter and amplifier (26) on the one hand and said first mixer ( 32) and third mixer (33) on the other, and it is arranged so as to in the first state to conduct a signal from said RF filter and amplifier (26) via said first mixer (32), said first IF filter (34) and said second mixer (34) to said RAKE receiver (14) and in the second state to conduct a signal from said RF filter and amplifier (26) via said third mixer (33), said second IF filter (35) and said fourth mixer (35) to said measuring receiver (16). 4. The radio apparatus of claim 1, characterized in that the radio apparatus comprises an oscillator (44, 45) for the first reception branch and the second reception branch (40, 41) to produce an IF mixing frequency needed for the tuning of the reception branch. 5. The radio apparatus of claim 1, characterized in that the radio apparatus comprises a common oscillator (46) to produce IF mixing frequencies needed for tuning all the reception branches as well as frequency conversion means (47, 48) to convert in each reception branch the frequency produced by said common oscillator to an IF mixing frequency suitable for said tuning. 6. The radio apparatus of claim 1, characterized in that said RAKE receiver comprises a measuring block (14e) for measuring the impulse response of received signals, and said measuring block can be repeatedly set so as to measure alternatively the signal produced by the first reception branch or the signal produced by the second reception branch. 7. A method for making frequency specific measurements in a diversity receiver operative with at least two reception branches and which receives at an operating frequency, the method comprising: directing signals of respective ones of the reception branches at the operating frequency to the diversity receiver; for making a measurement at other than the operating frequency, tuning at least one reception branch to other than the operating frequency; and redirecting the signal received by the at least one reception branch to a measuring receiver, wherein the tuning of at least one branch of the diversity receiver to other than the operating frequency is timed according to a certain predetermined timetable which is known to a transmitter apparatus transmitting at the operating frequency. 8. The method of claim 7, characterized in that the transmitter apparatus transmitting at the operating frequency is also requested (62) to transmit at a higher power during the time that said at least one branch of the diversity receiver is tuned to other than the operating frequency. 9. The method of claim 8, characterized in that a request for said transmitting at a said higher power is transmitted to said transmitter apparatus at a moment of time which is earlier by a certain delay length than the commencement of making the measurements at other than the operating frequency, said delay length corresponding to the previously estimated delay between a transmitted request for changing transmission power and the arrival at the receiver of the first transmission with the transmission power changed as per the request. 10. The method of claim 8, characterized in that a request for transmitting at a lower power is transmitted to said transmitter apparatus at a moment of time which is earlier by a certain delay length than the end of making the measurements at other than the operating frequency, said delay length corresponding to the previously estimated delay between a transmitted request for changing transmission power and the arrival at the receiver of the first transmission with the transmission power changed as per the request. 11. The method of claim 7, characterized in that said transmitter apparatus has various timetables concerning various terminals or groups of terminals. 12. The method of claim 7, characterized in that bit errors that occur in the reception while at least one branch of the diversity receiver is tuned to other than the operating frequency are corrected using interleaving in the signal received at the operating frequency. 13. The method of claim 7, characterized in that the tuning of at least one branch of the diversity receiver to other than the operating frequency is timed according to a timetable determined by the diversity receiver, an interval in the timetable between consecutive tunings of at least one branch of the diversity receiver to other than the operating frequency being inversely proportional to a relative received power, and proportional to the received power at the operating frequency, on some or several other carriers. 14. A method for making frequency specific measurements in a diversity receiver which comprises at least two reception branches, one of the two reception branches having a switch that has at least two states and a RAKE receiver including correlator branches which receives radio signals at an operating frequency, characterized in that: in order to make measurements at other than the operating frequency, interrupting an impulse response measurement at the operating frequency carried out by a measuring block in the RAKE receiver; and setting said measuring block to carry out a measurement at said other than the operating frequency; directing, when the switch is in a first state, a signal received by the reception branch having the switch to the RAKE receiver; and directing, when the switch is in a second state, the signal received by the reception branch having the switch to a measuring receiver. 15. A communications system (70) comprising base stations (71, 72) and terminals (76) of which at least one comprises a diversity receiver (77) which has at least two reception branches and a RAKE receiver, wherein the RAKE receiver includes correlator branches for combining signals received by different reception branches, the diversity receiver also has a measuring receiver to make measurements, and wherein at least one terminal is arranged so as to tune a first reception branch (12; 40) to frequencies other than of a second reception branch (13; 41) and to make measurements of both the signal produced by the first reception branch and the signal produced by the second reception branch, and the tuning of said first reception branch to said other frequencies is timed according to a certain predetermined timetable which is known to at least one base station. 16. A radio apparatus comprising a diversity receiver which has: means for processing received signals in a first reception branch and a second reception branch; a RAKE receiver comprising correlator branches and means for combining received signal components on baseband frequency; measuring receiver means for making measurements; means for tuning the first reception branch to a different frequency than the second reception branch and for making measurements of a signal produced by one reception branch simultaneously with the reception of a signal produced by the other reception branch; and in at least one reception branch, switching means for directing the signal received by said at least one reception branch having the switching means alternatively to said RAKE receiver or to said measuring receiver means. 17. A communications system comprising base stations and terminals of which at least one comprises a diversity receiver which has means for processing received signals in at least two reception branches and a RAKE receiver including correlator branches for combining signals received by different reception branches and which also has measuring receiver means for making measurements, wherein at least one terminal comprises means for tuning a first reception branch to other frequencies than a second reception branch and means for making measurements of both the signal produced by the first reception branch and the signal produced by the second reception branch, and means for timing the tuning of said first reception branch to other frequencies according to a certain predetermined timetable which is known to at least one base station.
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