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公开(公告)号：US10341874B2
公开(公告)日：2019-07-02
申请号：US15318019
申请日：2015-06-10
摘要： There are provided a base station apparatus, a terminal apparatus, and a communication method which are capable of realizing a LTE-A system with improved throughput by performing a CA technology including an unlicensed band while suppressing interference from an existing system. A base station apparatus according to the present invention, which is included in a communication system that applies a communication scheme applied to a first frequency band capable of being used as a dedicated frequency band to a second frequency band different from the first frequency band and is capable of communicating with a terminal apparatus by using the second frequency band and the second frequency band. The base station apparatus: adds at least signal null periods to a frame of a second signal transmitted using the second frequency band; and sets a frame length of a signal frame included in the frame of the second signal transmitted using the second frequency band to be less than a frame length of a signal frame included in the frame of the first signal transmitted using the first frequency band.
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公开(公告)号：US10536931B2
公开(公告)日：2020-01-14
申请号：US16022895
申请日：2018-06-29
摘要： In an LTE-A system, there is a problem that it is difficult to perform stable communication in a case where there is a time when another system occupies an unlicensed band being used. There is provided a base station apparatus that communicates with a terminal device in a second frequency band different from a first frequency band capable of being used as a dedicated frequency band. The base station apparatus includes: a wireless transmission unit that transmits data or control information to the terminal device; and a wireless reception unit that receives data or control information transmitted from the terminal device. The wireless transmission unit transmits data to the terminal device, and the wireless reception unit performs a process of receiving ACK/NACK transmitted from the terminal device in a subframe of an initial uplink after communication of another system is ended in a case where the other system performs the communication in the second frequency band at a reception timing of the ACK/NACK of the data transmission.
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公开(公告)号：US10212620B2
公开(公告)日：2019-02-19
申请号：US15510525
申请日：2015-08-28
IPC分类号： H04W24/10 , H04J11/00 , H04W16/14 , H04W56/00 , H04L5/14 , H04L27/26 , H04W72/04 , H04B17/318 , H04W88/08 , H04W28/08
摘要： A time period between transmission of a synchronization signal and the next transmission thereof may become undesirably longer depending on a usage state of an unlicensed band and a terminal apparatus requires a long time to measure receive power of signals from a plurality of base station apparatuses that perform communication in the unlicensed band. A base station apparatus that communicates with a terminal apparatus in a second frequency band different from a first frequency band includes: a DL signal generator that generates a signal to be transmitted to the terminal apparatus; a radio transmitter that transmits the signal; and a connected terminal manager that receives subframe information to be transmitted to the terminal apparatus from another base station apparatus that communicates with the terminal apparatus in the first frequency band. The radio transmitter transmits the signal with at least one subframe included in the subframe information.
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公开(公告)号：US10034306B2
公开(公告)日：2018-07-24
申请号：US15319823
申请日：2015-06-18
摘要： In an LTE-A system, there is a problem that it is difficult to perform stable communication in a case where there is a time when another system occupies an unlicensed band being used. There is provided a base station apparatus that communicates with a terminal device in a second frequency band different from a first frequency band capable of being used as a dedicated frequency band. The base station apparatus includes: a CS determination unit that performs carrier sense in a subframe of carrier sense configured in the second frequency band; a synchronization signal generation unit that generates a synchronization signal; and a wireless transmission unit that transmits the synchronization signal. In a case where the CS determination unit determines that another system does not perform communication in the second frequency band, the wireless transmission unit transmits the synchronization signal generated by the synchronization signal generation unit.
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公开(公告)号：US09820163B2
公开(公告)日：2017-11-14
申请号：US15318041
申请日：2015-05-29
CPC分类号： H04W16/14 , H04J1/00 , H04J11/00 , H04L5/001 , H04L5/0053 , H04W72/04 , H04W72/042 , H04W72/0446 , H04W88/02 , H04W88/10
摘要： There are provided a base station apparatus, a terminal apparatus, and a communication method which are capable of realizing a LTE-A system with improved throughput by performing a CA technology including an unlicensed band while suppressing interference from an existing system. A base station apparatus according to the present invention is a base station apparatus which is included in a communication system that applies a communication scheme applied to a first frequency band capable of being used as a dedicated frequency band to a second frequency band different from the first frequency band and is capable of communicating with a terminal apparatus by using the second frequency band and the second frequency band. The base station apparatus synchronizes a frame number of a frame of a first signal transmitted using the first frequency band with a frame number of a frame of a second signal irrespective of whether or not the second signal transmitted using the second frequency band is transmitted.
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