公开(公告)号：US10707949B2

公开(公告)日：2020-07-07

申请号：US16078753

申请日：2017-01-26

Applicant: SoftBank Corp.

Inventor： Shota Shiobara ,  Takao Okamawari ,  Teruya Fujii

IPC: H04W28/00 ,  H04B7/155 ,  H04W28/18 ,  H04W72/12 ,  H04J11/00 ,  H04B7/024 ,  H04L5/00 ,  H04W28/16 ,  H04W24/02 ,  H04B1/71 ,  H04W24/10 ,  H04W92/20 ,  H04B7/0452 ,  H04W36/30

Abstract: A communication system, a base station and a communication control method are provided, which are capable of cooperatively transmitting data from a plurality of base stations to a plurality of communication terminals using a same radio resource. A first base station acquires a value of an interference suppression parameter that is applied to a transmission signal from the first base station so as to suppress interference from a second base station in a first communication terminal, when the first communication terminal locates in a cell border area. The second base station duplicates a desired data for a second communication terminal located in a cell of the second base station, and transmits the duplicated desired data to the first base station. The first base station generates a transmission signal based on the value of the interference suppression parameter, the desired data for the first communication terminal, the desired data for the second communication terminal received from the second base station and a control information on data cooperative transmission, and the second base station generates a transmission signal of the desired data for the second communication terminal. Each of the base stations cooperatively transmits the transmission signal at a predetermined data cooperative transmission timing.

公开(公告)号：US20190075535A1

公开(公告)日：2019-03-07

申请号：US16080331

申请日：2017-01-30

Applicant: SoftBank Corp.

Inventor： Shota Shiobara ,  Takao Okamawari ,  Teruya Fujii

IPC: H04W56/00 ,  H04W16/32

Abstract: A deviation of time at which downlink signals synchronously transmitted from a macro-cell base station and a small-cell base station respectively reach a communication terminal apparatus can be made within an allowable range, without being affected by transmission delay in transmission cables of base station and propagation delay in radio transmission paths. The small-cell base station is provided with a radio transceiving section connected with antenna, a radio communication control section, a transmission cable connected with the radio transceiving section and the radio communication control section, and a downlink signal receiving section for receiving downlink signals transmitted from the macro-cell base station and the own base station respectively. The small-cell base station measures a reception-timing difference of downlink signals transmitted from the macro-cell base station and the own base station based on a reception result of the downlink signal, adjusts a transmission timing of downlink signal of the own base station based on the reception-timing difference, and transmits a downlink signal at the adjusted transmission timing.

公开(公告)号：US10785738B2

公开(公告)日：2020-09-22

申请号：US16080331

申请日：2017-01-30

Applicant: SoftBank Corp.

Inventor： Shota Shiobara ,  Takao Okamawari ,  Teruya Fujii

IPC: H04W56/00 ,  H04W16/32 ,  H04W16/28 ,  H04W28/16

Abstract: A deviation of time at which downlink signals synchronously transmitted from a macro-cell base station and a small-cell base station respectively reach a communication terminal apparatus can be made within an allowable range, without being affected by transmission delay in transmission cables of base station and propagation delay in radio transmission paths. The small-cell base station is provided with a radio transceiving section connected with antenna, a radio communication control section, a transmission cable connected with the radio transceiving section and the radio communication control section, and a downlink signal receiving section for receiving downlink signals transmitted from the macro-cell base station and the own base station respectively. The small-cell base station measures a reception-timing difference of downlink signals transmitted from the macro-cell base station and the own base station based on a reception result of the downlink signal, adjusts a transmission timing of downlink signal of the own base station based on the reception-timing difference, and transmits a downlink signal at the adjusted transmission timing.

公开(公告)号：US20190089453A1

公开(公告)日：2019-03-21

申请号：US16078753

申请日：2017-01-26

Applicant: SoftBank Corp.

Inventor： Shota Shiobara ,  Takao Okamawari ,  Teruya Fujii

IPC: H04B7/155 ,  H04W28/18 ,  H04W72/12 ,  H04W92/20 ,  H04W24/10 ,  H04B1/71

Abstract: A communication system, a base station and a communication control method are provided, which are capable of cooperatively transmitting data from a plurality of base stations to a plurality of communication terminals using a same radio resource. A first base station acquires a value of an interference suppression parameter that is applied to a transmission signal from the first base station so as to suppress interference from a second base station in a first communication terminal, when the first communication terminal locates in a cell border area. The second base station duplicates a desired data for a second communication terminal located in a cell of the second base station, and transmits the duplicated desired data to the first base station. The first base station generates a transmission signal based on the value of the interference suppression parameter, the desired data for the first communication terminal, the desired data for the second communication terminal received from the second base station and a control information on data cooperative transmission, and the second base station generates a transmission signal of the desired data for the second communication terminal. Each of the base stations cooperatively transmits the transmission signal at a predetermined data cooperative transmission timing.