公开(公告)号：JP2002112351A

公开(公告)日：2002-04-12

申请号：JP2001230494

申请日：2001-07-30

Applicant: TOSHIBA CORP

Inventor： SERIZAWA MUTSUMI ,  OGURA KOJI ,  MUKAI MANABU ,  WAKUTSU TAKASHI ,  NAMEKATA MINORU ,  NAKAJIMA NOBUYASU ,  KAMAGATA EIJI ,  NOUJIN KATSUYA ,  TOSHIMITSU KIYOSHI

IPC: H04L12/70 ,  H04W28/06 ,  H04Q7/38

Abstract: PROBLEM TO BE SOLVED: To provide a radio communication system capable of relatively increasing a downlink communication speed more than an uplink communication speed so as to transmit the information through a downlink at a high-speed in a large capacity thereby enhancing the frequency utilization efficiency. SOLUTION: The radio communication system is provided with radio terminals and radio base stations each using a radio wave with each terminal for radio communication. The radio terminal is provided with a 1st transmission means that uses a 1st radio transmission band using a radio wave at a 1st frequency band to make a 1st radio communication with one or more of the base stations and with a 1st reception means that uses a radio wave at a 2nd frequency band higher than the 1st frequency band, uses a 2nd radio transmission band at a higher speed than that of the 1st radio transmission band and makes a 2nd radio communication with one or more of the radio base stations. Any of the radio base stations is provided with a 2nd reception means that uses the 1st radio transmission band to make the 1st radio communication with the radio terminal and any of the radio base station is provided with a 2nd reception means that uses the 2nd radio transmission band to make the 2nd radio communication with the radio terminal.

公开(公告)号：JP2001274774A

公开(公告)日：2001-10-05

申请号：JP2000083534

申请日：2000-03-24

Applicant: TOSHIBA CORP

Inventor： ABE MASAHIRO ,  KIKUCHI HIDEO ,  MITSUKI ATSUSHI ,  SERIZAWA MUTSUMI

IPC: H04N7/08 ,  H04L1/00 ,  H04N7/081

Abstract: PROBLEM TO BE SOLVED: To realize synchronization between a pilot channel and an information channel with a small delay time, without the need for transmission of excess information through the pilot channel. SOLUTION: Interleave circuits 111-11n of a transmitter side sets the number of paths for convolution interleaving to be a measure of the number of bits equivalent to one frame of a control channel. Then an attachment circuit 14 attaches a path-switching timing to a frame head of a pilot channel as fixed pattern data in matching with a frame period of the pilot channel. A receiver side, however, detects the fixed pattern data from demodulated data of the pilot channel and switches selection paths of de-interleaving circuits 241-24n for each information channel to initial positions according to the detected timing. As a result, the receiver side can synchronize the pilot channel with the information channel in frame units of the pilot channel.

公开(公告)号：JP2001060910A

公开(公告)日：2001-03-06

申请号：JP23410499

申请日：1999-08-20

Applicant: TOSHIBA CORP

Inventor： SAKAMOTO TAKEFUMI ,  KAMAGATA EIJI ,  SERIZAWA MUTSUMI

IPC: H04B7/26 ,  H04L12/28 ,  H04W48/16 ,  H04W48/18 ,  H04W88/02 ,  H04Q7/34

Abstract: PROBLEM TO BE SOLVED: To provide a radio terminal which can reduce power consumption in a radio communication system whose service area is narrow. SOLUTION: In a radio terminal 1 which can use a radio communication system whose service area is narrow, a service area recognition part 4 collates a result obtained by permitting a position recognition part 2 to recognize the position of the radio terminal 1 itself by GPS or the like with information on the service area that can use the radio communication system accumulated in a service area information accumulation part 3. It is recognized whether the radio terminal 1 itself exists in the service area or not. The power of a reception part 6 of the radio communication system is turned on only in the service area with control of a reception control part 5 corresponding to the recognized result and the power of the reception part 6 of the radio communication system is turned off in a part out of the service area.

公开(公告)号：JP2000059281A

公开(公告)日：2000-02-25

申请号：JP22582999

申请日：1999-08-09

Applicant: TOSHIBA CORP

Inventor： SOEYA MIYUKI ,  SERIZAWA MUTSUMI ,  OGURA KOJI ,  NAMEKATA MINORU

IPC: H04L23/00 ,  H04B7/15

Abstract: PROBLEM TO BE SOLVED: To simply switch a satellite by detecting relative positions among a plurality of orbital satellites and a mobile terminal and selecting an orbital satellite that is a communication opposite party of the mobile terminal among the plurality of the orbital satellites based on the detected relative positions. SOLUTION: A memory 103 that stores positions and traveling directions of satellites in cross reference with time provides an output of a position and a traveling direction of each satellite corresponding to a current position when receiving a current time from a timer 101. Then a position identification device 105 outputs information denoting at which position of the earth a mobile object is resident. A relative position detection circuit 107 detects a relative position of the mobile object and each orbital satellite based on outputs from the memory 103 and the position identification device 105 and outputs information denoting at which position each orbital satellite stays with respect to the mobile object. Then an optimum connection satellite selection device 109 outputs information denoting to which satellite among a plurality of the orbital satellites the mobile terminal connects optimally. That is, the optimum connection satellite selection device 109 discriminates with which satellite the mobile object opens a communication channel optimally.

公开(公告)号：JPH11163946A

公开(公告)日：1999-06-18

申请号：JP23338998

申请日：1998-08-20

Applicant: TOSHIBA CORP

Inventor： TAKAGI MASAHIRO ,  KATO NORIYASU ,  TSUNODA KEIJI ,  NAKAKITA KUMIKO ,  NOUJIN KATSUYA ,  SERIZAWA MUTSUMI ,  KAMAGATA EIJI ,  NAKAJIMA NOBUYASU

IPC: H04B7/26 ,  H04L12/28 ,  H04L29/06 ,  H04L29/08 ,  H04W80/04 ,  H04W80/06 ,  H04W92/02 ,  H04L12/66 ,  H04Q7/22 ,  H04Q7/24 ,  H04Q7/26 ,  H04Q7/30

Abstract: PROBLEM TO BE SOLVED: To provide a gateway device, a radio base station equipment a router device and a radio terminal equipment that can improve performance of a communication for using a transport layer connection by way of a radio network. SOLUTION: Base station equipments 1401 to 1406 bidirectionally convert the first transport layer protocol used for communication in a radio network and the second transport protocol used for communication of a wire network 1101 when communication is performed between radio terminal 1801 to 1804 stored in the radio network and a wire terminals stored in the wire network. Furthermore, the facilities are equipment with a coordinating means for coordinating one of plural conversion devices for controlling a transport layer connection in this radio network in accordance with a radio communication state of the radio terminals 1801 to 1804 to the radio terminal 1801 to 1804 existing in radio service areas 1701 to 1706 and a notification means for notifying a conversion device coordinated to these radio terminals by the coordinating means of information on the radio communication state of the radio terminals 1801 to 1804 that exist in the radio service area 1701 to 1706.

公开(公告)号：JPH10336044A

公开(公告)日：1998-12-18

申请号：JP14693697

申请日：1997-06-04

Applicant: TOSHIBA CORP

Inventor： NAKAJIMA NOBUYASU ,  SERIZAWA MUTSUMI

IPC: H03M13/00 ,  H03M13/23 ,  H03M13/12

Abstract: PROBLEM TO BE SOLVED: To simplify the constitution of a receiver which decodes each error correcting code obtained by block coding and convolutional coding as a whole and to improve the error correcting ability of the receiver. SOLUTION: A receiver is provided with a demodulator 2 which generates the soft discriminating information 3 of each error correcting code from received signals 1 containing convolutionally coded error correcting codes and block- coded error correcting codes, a first error correcting decoder 4 which Viterbi- decodes the convolutionally coded error correcting codes by using the soft discrimination information 3 outputted from the demodulator 2, and a second error correcting decoder 5 which Viterbi-decodes the block-coded error correcting codes by using the information 3 outputted from the demodulator 2 so that the receiver may perform error correcting decoding on block codes by using the information 3. Therefore, the error correcting ability of the receiver for the block codes can be improved and the output of the demodulator 2 can be unified into the soft discriminating information 3. In addition, the ACS computing element in each Viterbi decoder can be shared.

公开(公告)号：JPH10308972A

公开(公告)日：1998-11-17

申请号：JP11997297

申请日：1997-05-09

Applicant: TOSHIBA CORP

Inventor： MITSUKI ATSUSHI ,  SERIZAWA MUTSUMI

IPC: H04W24/02 ,  H04W72/04 ,  H04W72/08 ,  H04W72/10 ,  H04Q7/36 ,  H04Q7/22 ,  H04Q7/28

Abstract: PROBLEM TO BE SOLVED: To allow a CDMA cellular system to accommodate much more calls by making the system adaptive to multimedia communication. SOLUTION: A CDMA cellular system has plural base stations BS1, BS2 arranged distributingly and mobile terminals MS1, MS2, MS3. Each of the base stations BS1, BS2 discriminates whether the mobile terminals MS1, MS2, MS3 are dynamic or static based on a kind of a call received from the mobile terminals MS1, MS2, MS3, and in the case that the mobile terminals MS1, MS2, MS3 are static, a code channel is assigned by applying the dynamic channel assignment method taking a structure of re-use partitioning.

公开(公告)号：JPH1079724A

公开(公告)日：1998-03-24

申请号：JP23303896

申请日：1996-09-03

Applicant: TOSHIBA CORP

Inventor： TOSHIMITSU KIYOSHI ,  SERIZAWA MUTSUMI ,  KATO NORIYASU ,  NAKAJIMA NOBUYASU ,  NOUJIN KATSUYA ,  KAMAGATA EIJI

IPC: H04L1/00 ,  H04B7/26 ,  H04W16/28 ,  H04W24/10 ,  H04W36/08 ,  H04W36/30 ,  H04W52/20 ,  H04W72/04

Abstract: PROBLEM TO BE SOLVED: To conduct improvement control on a transmission characteristic of a transmission system at a radio base station more accurately, to make data reception stably at a radio terminal equipment, to improve the communication quality between the radio base station and the radio terminal equipment and to suppress a rapid packet error under multi-path fading environment in advance especially in the case of packet communication adopting an error correction code. SOLUTION: A radio terminal equipment 5 is provided with a measurement means using an error correction code included in information data so as to measure number of bits whose error is corrected in the case of receiving and decoding information data sent from a radio base station 2 via a radio channel, and a notice means informing the measurement result by the measurement means to the radio base station 2. The radio base station 2 is provided with a means for feedback control of a transmission system to the radio terminal equipment 5 based on a state of a change in bit number for error correction noticed from the radio terminal equipment 5.

公开(公告)号：JPH09233075A

公开(公告)日：1997-09-05

申请号：JP35534696

申请日：1996-12-20

Applicant: TOSHIBA CORP

Inventor： KAMAGATA EIJI ,  NOUJIN KATSUYA ,  TOSHIMITSU KIYOSHI ,  NAKAJIMA NOBUYASU ,  SERIZAWA MUTSUMI

IPC: H04L12/46 ,  H04B7/26 ,  H04L12/28

Abstract: PROBLEM TO BE SOLVED: To make a portable information terminal equipment small in size and light in weight, to reduce the power consumption and to attain efficient multimedia communication by allowing a terminal module to have reception sections and selection synthesis sections for different frequencies. SOLUTION: First and seconds antennas 7A1, 7A2 of a terminal module receive transmission signals of different 1st and 2nd frequency bands. Received signals are demodulated by 1st and 2nd radio receivers 7B1, 7B2. A format of the reception signal is converted into a format suitable for an output from an output circuit 7D by 1st and 2nd transmission format converters 7C1, 7C2 and fed to a selection synthesis circuit 7E. The selection synthesis circuit 7E selects an output of either of the converters based on a selection signal (d) or synthesizes both the outputs in time division multiplex and gives the result to the output circuit 7D.

公开(公告)号：JPH09200825A

公开(公告)日：1997-07-31

申请号：JP953196

申请日：1996-01-23

Applicant: TOSHIBA CORP

Inventor： TOSHIMITSU KIYOSHI ,  SERIZAWA MUTSUMI ,  NOUJIN KATSUYA ,  KAMAGATA EIJI ,  NAKAJIMA NOBUYASU

IPC: H04W12/08 ,  H04Q7/16

Abstract: PROBLEM TO BE SOLVED: To provide a control procedure for efficient information transmission in the radio communication system having incoming/outgoing radio channels with a narrow frequency band and an outgoing radio channel with a broad frequency band. SOLUTION: In this radio communication system having incoming/outgoing radio channels with a narrow frequency band and an outgoing radio channel with a broad frequency band, when a radio terminal equipment 100 receives information via the outgoing radio channel with a broad frequency band, the incoming/outgoing radio channels with a narrow frequency band are to be allocated to the radio terminal equipment 100. Thus, the communication using the outgoing radio channel with a broad frequency band is attained. Furthermore, the incoming/outgoing radio channels with a narrow frequency band are used for radio channels to control the information transmission using the outgoing radio channel with a broad frequency band to be efficient.