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11. 发明专利

JPH0685739A MOBILE RADIO COMMUNICATION CONTROL SYSTEM 失效
公开(公告)号：JPH0685739A
公开(公告)日：1994-03-25
申请号：JP23687592
申请日：1992-09-04
申请人： FUJITSU LTD
发明人： NAKAMURA TADASHI , TAKENAKA TETSUYOSHI , TAJIMA YOSHIHARU
IPC分类号： H04W76/02 , H04B7/26 , H04M1/00 , H04W36/06 , H04W72/04 , H04W84/08
摘要： PURPOSE:To utilize effectively the frequency in the mobile radio communication control system for direct communication between mobile stations for a cellular telephone set and a portable telephone set or the like. CONSTITUTION:When mobile stations 2-1, 2-2 in one and the other cell 3 of a base station 1 connected to an exchange control station 4 are connected via the base station 1 and direct communication is attained between the mobile stations 2-1, 2-2 and the FDMA system is adopted, an up-link channel of a frequency f1 allocated to the one mobile station 2-1 is allocated for a down-link channel of the other mobile station 2-2, and a down-link channel of a frequency f2 allocated to the one mobile station 2-1 is allocated to a channel for an up-link of the other mobile station 2-2 as an up-link channel of the other mobile station 2-2, and direct communication is implemented not through the base station 1 between the one and other mobile stations 2-1,2-2.

12. 发明专利

JPH05113834A DIGITAL SIGNAL PROCESSING SYSTEM 失效
公开(公告)号：JPH05113834A
公开(公告)日：1993-05-07
申请号：JP27587591
申请日：1991-10-24
申请人： FUJITSU LTD
发明人： TAKENAKA TETSUYOSHI , YAMASHITA ATSUSHI
IPC分类号： G06F1/08
摘要： PURPOSE:To provide the digital signal processing system which wastes no electric power when a throughput quantity varies with time. CONSTITUTION:The digital signal processing system 10 is equipped with a means 1 which detects the throughput of the digital signal processing system 10 and a clock speed control means 2 which is driven with the detection signal of the throughput detecting means 1 and controls the speed of a clock for operating this system 10, and the clock speed control means 2 controls the clock so that its frequency is low when the signal throughput of the system is small or high when large.

13. 发明专利

JPH04310038A DIGITAL MODULATION/DEMODULATION SYSTEM 失效
公开(公告)号：JPH04310038A
公开(公告)日：1992-11-02
申请号：JP7540091
申请日：1991-04-08
申请人： FUJITSU LTD
发明人： TAKENAKA TETSUYOSHI , FURUKAWA HIDETO
IPC分类号： H04L27/18 , H04L27/22 , H04L27/227
摘要： PURPOSE:To obtain the digital modulation demodulation system with a small bit error rate with respect to the digital modulation/demodulation system implementing the pi/4 shift QPSK modulation and demodulation. CONSTITUTION:The digital modulation/demodulation system modulating a differential code having a delay time by a prescribed symbol at a sender side while shifting the code by pi/4 each and demodulating the code at a receiver side through delay detection based on the delay time is provided with a delay means delaying two symbols and a differential coding means implementing differential coding by a delay time by two symbols to generate a pi/4 shift QPSK modulation wave subjected to differential coding having a 2-symbol delay time, and with a delay detection circuit 11 using the delay means for 2-symbol delay to implement delay detection of 2-symbol delay, a phase shift means 12 rotating an output of the delay detection circuit by pi/4 and a data discrimination means 13 discriminating the data based on an output of the phase shift means at the receiver side to implement pi/4 shift QPSK demodulation.

14. 发明专利

JPH03104357A MULTI-VALUE POLYPHASE MODULATOR 失效
公开(公告)号：JPH03104357A
公开(公告)日：1991-05-01
申请号：JP24071489
申请日：1989-09-19
申请人： FUJITSU LTD
发明人： AOKI NOBUHISA , TAKENAKA TETSUYOSHI , TOZAWA YOSHIHARU
IPC分类号： H04L27/36
摘要： PURPOSE:To eliminate the need for the adjustment of a phase of a carrier and an amplitude of a base band signal by providing a carrier address generating section generating an m-bit carrier address, an ROM outputting a multi-value polyphase digital modulation wave in response to an input address of an n-bit data series and a D/A converter. CONSTITUTION:A carrier address generating section 1 generates an m-bit carrier address of a prescribed sampling period and an ROM 2 receives an n-bit data series consecutive timewise and an m-bit carrier address and outputs a multi- value polyphase digital modulation wave accordingly and a D/A converter 3 applies D/A conversion to the multi-value polyphase digital modulation wave. Moreover, two orthogonal amplitude components are calculated from n-bit data series in advance and a sine wave component and a cosine wave component represented by an m-bit carrier address are multiplied with the result for the synthesis and the result is stored input address to the ROM 2.

15. 发明专利

JPH01206760A SWEEP CONTROL CIRCUIT 失效
公开(公告)号：JPH01206760A
公开(公告)日：1989-08-18
申请号：JP3081388
申请日：1988-02-15
申请人： FUJITSU LTD
发明人： TAKENAKA TETSUYOSHI , TOZAWA YOSHIHARU , FURUKAWA HIDETO , YAMASHITA ATSUSHI
IPC分类号： H04L27/22 , H04L7/00
摘要： PURPOSE:To securely and stably obtain synchronization and to shorten time to be needed for leading-in by executing sweep, which further adds prescribed quantity, from a time point when the synchronization can be obtained at first. CONSTITUTION:Synchronism decision is executed in a synchronism deciding circuit 7 based on the bit error rate of demodulating data. From the point of time when the synchronism decision is executed in this synchronism deciding circuit 7, a sweep control part 20 further executes the additional sweep in a step shape by the prescribed quantity and a signal to cause the frequency of a local oscillator 3 to close to a carrier frequency is supplied to the local oscillator 3. The output oscillating frequency of the local oscillator 3 is multiplied to a receiving signal and the demodulating data are outputted.

16. 发明专利

JPH0767165A MULTIPLE RADIO ZONE MOBILE COMMUNICATION SYSTEM 失效
公开(公告)号：JPH0767165A
公开(公告)日：1995-03-10
申请号：JP20736293
申请日：1993-08-23
申请人： FUJITSU LTD
发明人： TAJIMA YOSHIHARU , TAKENAKA TETSUYOSHI
IPC分类号： H04Q7/28 , H04Q7/22 , H04Q7/36
摘要： PURPOSE:To provide the multiple radio zone mobile communication system which eliminates a momentary disconnection when a mobile station performs channel switching from a small radio zone to a large radio zone during a communication by a TDMA system. CONSTITUTION:A 2nd transmitting and receiving means 23 performs synchronization with a channel channel of a large radio zone base station under the control of a synchronous control means 20a while, for example, a 1st transmitting and receiving means 22 has a communication with a small radio zone base station; when a moving speed detected by a speed detecting means 21 exceeds a reference value, the 2nd transmitting and receiving means 23 in a no-speaking state sends a call connection request signal with the control channel of the base station in the large radio zone under the control of a transmission control means 20b, and consequently when a speaking channel is set, switching to the set speaking channel is performed to continues the call without any momentary disconnection.

17. 发明专利

JPH06133351A COMMUNICATION CONTROL SYSTEM 失效
公开(公告)号：JPH06133351A
公开(公告)日：1994-05-13
申请号：JP27745492
申请日：1992-10-15
申请人： FUJITSU LTD
发明人： TAKENAKA TETSUYOSHI
IPC分类号： H04B7/26 , H04Q7/04
摘要： PURPOSE:To attain sure connection without movement of a mobile station even when a communication traffic is concentrated locally or a fault takes place in a radio base station with respect to the communication control circuit system of mobile communication. CONSTITUTION:A channel management means 12 manages a communication channel used by a communication controller 11 for the communication with a host station such as a radio line control station and a mobile station 100 at present and outputs number of communication channels in use. A transmission power command means, 13 receiving number of channels from the channel management means 12 outputs a decrease command when the channel number is increased and outputs an increase command when the channel number is conversely decreased. An amplifier 5 decreases the amplification factor of the transmission power for a control channel when the decrease command comes from the transmission power command means 13 and increases the amplification factor of the transmission power for the control channel when the increase command comes from the transmission power command means 13.

18. 发明专利

JPH0678359A RADIO LINE CONTROL METHOD 失效
公开(公告)号：JPH0678359A
公开(公告)日：1994-03-18
申请号：JP22570292
申请日：1992-08-25
申请人： FUJITSU LTD
发明人： TAKENAKA TETSUYOSHI , NAKAMURA TADASHI
IPC分类号： H04Q7/04
摘要： PURPOSE:To prevent a hit by selecting a base station in common to base stations forming a zone just before hand-off and base stations forming a zone just after as a branch of route diversity before and after the hand-off. CONSTITUTION:When a mobile station MS7 during communication moves to a position (2), that is, from a duplicate zone A1 to A2, the MS7 moves to the duplicate zone A2 shown in (3) after hand-off. In this case, base stations BS3, BS4 forming in common the zone A1 before hand-off and the zone A2 after hand-off are selected as the branches for route diversity after and before the hand-off. Thus, the MS7 is in line connection to either a BS3 or a BS4 just before the hand-off for communication and then the hand-off is implemented. As a result, since the MS 7 is in line connection with the same base station just before and just after the hand-off and hand-off is implemented, the hit of the communication at hand-off is prevented.

19. 发明专利

JPH0678357A MOBILE RADIO COMMUNICATION METHOD 失效
公开(公告)号：JPH0678357A
公开(公告)日：1994-03-18
申请号：JP22570392
申请日：1992-08-25
申请人： FUJITSU LTD
发明人： TAKENAKA TETSUYOSHI
IPC分类号： H04B7/26 , H04Q7/04
摘要： PURPOSE:To enhance the effect of the route diversity at maximum with respect to the mobile radio communication method implementing route diversity by plural base stations to each mobile station. CONSTITUTION:When radio base stations BS1, BS2 being connection object branches of a mobile station MS and an interference mobile station MSI and an interference radio base station BSI are in existence, signal to interference signal power ratios CIRu1, CIRu2 with respect to an up-link of the MS and signal to interference signal power ratios CIRd1, CIRd2 with respect to a down- link of the MS are measured. Then the branch whose CIRu1, CIRu2, and CIRd1, CIRd2 are reference ratios or over is selected and a best branch in them is totally decided as a connection destination branch.

20. 发明专利

JPH0669859A MOBILE OBJECT RADIO CHANNEL ALLOCATION CONTROL SYSTEM 失效
公开(公告)号：JPH0669859A
公开(公告)日：1994-03-11
申请号：JP21994992
申请日：1992-08-19
申请人： FUJITSU LTD
发明人： TAKENAKA TETSUYOSHI , NAKAMURA TADASHI , TAJIMA YOSHIHARU
IPC分类号： H04B7/26
摘要： PURPOSE:To optimize the allocation of a radio channel corresponding to the moving speed of a mobile station in the mobile object radio channel allocation control system which allocates the radio channel to the mobile station of an automobile telephone or a portable telephone, etc. CONSTITUTION:The radio channel is divided into plural radio channel groups such as a radio channel group F2 for high-speed movement and a radio channel group F1(F11, F12, F13) for low-speed movement corresponding to the moving speed of the mobile station 2, for example. On the side of a radio base station 1, the moving speed of the station 2 is detected by a phasing cycle or the like, the radio channel group is selected corresponding to the moving speed of the mobile station 2, and any allocatable radio channel in the radio channel group is allocated to the mobile station 2.

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