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公开(公告)号：EP0698313A1
公开(公告)日：1996-02-28
申请号：EP94915169.0
申请日：1994-05-13
发明人： HÄKKINEN, Hannu , MÄKINEN, Jarmo , TOIVONEN, Mikko
摘要： The invention relates to a method for starting a radio transmitter. In the method a transmission frequency is generated by a phase/frequency-locked loop which comprises a phase/frequency comparator (101), a loop filter (102) and a voltage-controlled oscillator (105), and the start-up is performed by switching on an operating voltage (Ucc) to the voltage-controlled oscillator (105). To minimize the frequency error of the transmitter at the start-up, measuring data about relationship between the control voltage (Vc) of the oscillator and the output frequency (VCOFreq) of the oscillator at a specified calibration temperature are pre-stored in connection with the oscillator, and immediately before switching on the operating voltage (Ucc), control voltage (Vc) needed for locking onto the selected output frequency at the prevailing temperature is estimated and the estimated control voltage is set as the control voltage of the oscillator.
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公开(公告)号：EP0879511A2
公开(公告)日：1998-11-25
申请号：EP97913218.0
申请日：1997-11-25
摘要： The invention relates to a method for load control and a radio system. In the invention a load result describing the load is cell-specifically formed. The load result is formed either by comparing a signal strength of desired signals (23) and a combined total strength of interferences (13) and the desired signals (23) or by weighting a signal-to-interference ratio with a bandwidth or a data transmission rate. The load result is compared with a threshold value of the highest load level allowed of a cell (1). The data transmission rate in the cell (1) is increased if the load result is smaller than the threshold value. The data transmission rate in the cell (1) is reduced and the establishment of new connections is avoided if the load result exceeds the threshold value. In heavy load situations a signal-to-interference objective is also changed in order to balance the load result.
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公开(公告)号：EP0872060A2
公开(公告)日：1998-10-21
申请号：EP97940175.0
申请日：1997-09-05
CPC分类号： H04L25/03331 , H04B1/715 , H04J11/0036 , H04L5/0016 , H04L5/0041 , H04L25/0204 , H04L25/0228 , H04L2025/03414
摘要： The invention relates to a transmitting and receiving method and a radio system. In a transmitter (TR) the signals (37) to be transmitted are spread coded in means (31) and modulated by subcarriers in means (33). In a receiver (R) the signals are demodulated in means (35) and submitted to multiuser detection in means (36) by using the subcarriers to limit the number of detectable signals in the means (35). The receiver (R) uses multiuser detection for reducing multiple access interference and correcting frequency-selective fading.
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公开(公告)号：EP0752189A1
公开(公告)日：1997-01-08
申请号：EP95912276.0
申请日：1995-03-20
发明人： HOTTINEN, Ari , KIEMA, Arto , LAAKSO, Timo , HÄKKINEN, Hannu , TUORINIEMI, Aimo , KESKITALO, Ilkka , JOLMA, Petri , KÜHN, Ingo , SAVUSALO, Jari , KÄRKKÄINEN, Ari , SIIRA, Anne , UOLA, Risto
CPC分类号： H04B1/7103 , H04B2201/70702 , H04B2201/709709 , H04W72/082
摘要： The invention relates to interference cancellation in a cellular CDMA network served by base stations. The method of the invention comprises receiving in a mobile station (MS) a CDMA signal transmitted by at least one base station (BTS2) of a neighbouring cell (B) in the network and defining the phase of the spread spectrum code of the signal transmitted by said at least one neighbouring base station (BTS2) and monitoring its signal strength. After this, the measurement results of the mobile station (MS) are transmitted via the base station which is serving it to the CDMA network which infers whether the mobile station interferes with the base stations (BTS2) of the neighbouring cells. If interference occurs, the neighbouring cell base stations (BTS2) are informed of the channel the interfering mobile station (MS) is using, and the information of the signal transmitted by the interfering mobile station (MS) is utilized by taking it into account in the receivers of signals transmitted by other mobile stations within the cell.
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公开(公告)号：EP0698313B1
公开(公告)日：1999-04-28
申请号：EP94915169.0
申请日：1994-05-13
发明人： HÄKKINEN, Hannu , MÄKINEN, Jarmo , TOIVONEN, Mikko
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公开(公告)号：EP0872141A1
公开(公告)日：1998-10-21
申请号：EP95929130.0
申请日：1995-08-31
IPC分类号： H04W36
CPC分类号： H04W36/36
摘要： The invention relates to a handover method in a cellular radio system, and a cellular radio system. The cellular radio system comprises at least one subscriber terminal (101 and 102) and a base station (103 - 107), and in the system the subscriber terminal (101) maintains and continuously updates an active set of base stations (103 - 106), one or several base station (103 - 106) belonging to the active set having a connection or connection set-up facilities to the subscriber terminal. The subscriber terminal (101) controls the downlink transmission of one or several base stations (103 - 106) of the active set by switching the transmission of the base station on or off. This method provides a fast soft handover similar to the hard handover.
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公开(公告)号：EP0872061A1
公开(公告)日：1998-10-21
申请号：EP95929127.0
申请日：1995-08-31
发明人： HOTTINEN, Ari , HÄKKINEN, Hannu , RIKKINEN, Kari
CPC分类号： H04J13/00 , H04B7/2628
摘要： The invention relates to a data transmission method in a cellular radio system, and a cellular radio system, which comprises in each cell at least one base station (200), and a number of subscriber terminal equipments (202-206) connected to one or more base stations, the transmitter of said system comprising means (404) for multiplying the signal of each user by more than one pseudorandom sequences. For enabling a high spectral efficiency and advantageous interference cancellation, the transceiver of the system comprises means (404) for multiplying the signal of the user by more than one pseudorandom sequence, the data transfer rate of the signal substantially remaining the same. The transmitter further comprises means (404, 410, 402) for transmitting the signals of different users multiplied by the same pseudorandom sequences distinguished from each other by means of time-division.
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8.发明公开A CONNECTION ESTABLISHMENT METHOD, A SUBSCRIBER TERMINAL UNIT AND A RADIO SYSTEM 失效连接的方法，用户单元和无线电系统
公开(公告)号：EP0953259A2
公开(公告)日：1999-11-03
申请号：EP97902378.0
申请日：1997-02-04
CPC分类号： H04W74/0833 , H04B7/022 , H04W36/18 , H04W36/36 , H04W48/20 , H04W52/40 , H04W74/0866
摘要： The present invention relates to a method for establishing a random access type connection and a subscriber terminal equipment (37 to 38) and a radio system operating in accordance with the method. The subscriber terminal equipment (37 to 38) establishes a connection to several base stations (33 to 36) with the method of the invention. The base stations (33 to 36) are selected before establishing the connection by deducing the quality of the connection by means of pilot signals and both uplink and downlink interferences. The subscriber terminal equipment (37 to 38) has a connection to several base stations (33 to 36) already at the initial stage of the connection.
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公开(公告)号：EP0879510A2
公开(公告)日：1998-11-25
申请号：EP97913217.0
申请日：1997-11-25
发明人： SALONAHO, Oscar , HÄKKINEN, Hannu
CPC分类号： H04W52/267 , H04W52/24 , H04W52/34
摘要： The invention relates to a method of setting a load goal in a radio system. In the method a total signal strength (41) and a load result (44) are first formed, the load result being formed as an interrelationship between signal-to-interference ratio, bandwidth and data transmission rate. Then the total signal strength (41) change is compared with the load result (44) change, and such a load result (22) is searched for, the higher load results (44) of which provide a load result change lower than a predetermined threshold value in relation to the total signal (41) change, and said load result (22) is selected as a load goal (43).
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公开(公告)号：EP0840988A2
公开(公告)日：1998-05-13
申请号：EP97923127.0
申请日：1997-05-26
摘要： The present invention relates to a connection establishment method and a radio system. When a base station (11) detects a preamble (20) from a subscriber terminal equipment (13), the power adjustment of a closed loop is started for controlling the transmission power of the subscriber terminal equipment (13). Signals (15) of the base station (11) and the subscriber terminal equipment (13) are synchronized and the subscriber terminal equipment (13) sends a randomly selected identifier. The identifier determines a transit channel to which the subscriber terminal equipment (13) suggests to move. The base station (11) may change the suggested transit channel and echo the identifier back to the subscriber terminal equipment (13), and the base station (11) and the subscriber terminal equipment (13) communicate on the transit channel from which they move to a traffic channel. The inventive method accelerates connection establishment.
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