Repeater, wireless communication system, control method and recording medium
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04J-001/10
H04J-003/08
H04L-012/54
출원번호
US-0431552
(2009-04-28)
등록번호
US-8570931
(2013-10-29)
우선권정보
JP-2008-116925 (2008-04-28)
발명자
/ 주소
Yoshino, Kimitoshi
출원인 / 주소
Icom Incorporated
대리인 / 주소
Baker & McKenzie, LLP
인용정보
피인용 횟수 :
0인용 특허 :
2
초록▼
The present invention provides a repeater, a wireless communication system, a control method and a recording medium that can transmit the same signal received by plural repeaters to the recipient wireless communication device without redundancy of the signal. A repeater connected to a network and re
The present invention provides a repeater, a wireless communication system, a control method and a recording medium that can transmit the same signal received by plural repeaters to the recipient wireless communication device without redundancy of the signal. A repeater connected to a network and relaying a communication of a wireless communication device comprises a packet reception unit receiving a packet transmitted from a sender wireless communication device to a recipient wireless communication device from the network or the sender wireless communication device, a transmission unit transmitting the packet received by the packet reception unit to the recipient wireless communication device, a packet storing unit storing the packet to be transmitted to the recipient wireless communication device as a first packet, and a packet selection unit comparing the first packet with a second packet other than the first packet, and discarding the second packet when both packets match under a predetermined condition.
대표청구항▼
1. A repeater connected to a network and relaying a communication of a wireless communication device, the repeater comprising: a packet reception unit that receives a packet transmitted from a sender wireless communication device to a recipient wireless communication device from the network or the s
1. A repeater connected to a network and relaying a communication of a wireless communication device, the repeater comprising: a packet reception unit that receives a packet transmitted from a sender wireless communication device to a recipient wireless communication device from the network or the sender wireless communication device;a transmission unit that transmits the packet received by the packet reception unit to the recipient wireless communication device which is a transmission destination;a packet storing unit that stores, as a first packet, all of or a predetermined part of the packet transmitted to the recipient wireless communication device; anda packet selection unit that compares all of or a predetermined part of the first packet stored by the packet storing unit with all of or a predetermined part of a second packet, other than the first packet received by the packet reception unit, and discards the second packet when the first and second packets match under a predetermined condition;wherein when the packet reception unit receives a second packet which has the same sender as the first packet and which does not match the first packet under a predetermined condition, the packet selection unit excludes all of or a predetermined part of the stored first packet from a comparison target with all of or a predetermined part of the second packet, andwherein when the packet reception unit receives a second packet matching the first packet under a predetermined condition prior to transmitting the first packet, the packet selection unit compares an error rate of the first packet with an error rate of the second packet, and replaces the first packet stored in the packet storing unit with the second packet when the second packet has a smaller error rate than the error rate of the first packet. 2. The repeater according to claim 1, wherein the packet selection unit determines that the first packet and the second packet match when a rate that all of or a predetermined part of the first packet and all of or a predetermined part of the second packet match is greater than or equal to a predetermined value. 3. The repeater according to claim 1, wherein when a predetermined time elapses after the packet storing unit stores the first packet, the packet selection unit excludes all of or a predetermined part of the stored first packet from a comparison target with all of or a predetermined part of the second packet. 4. A method of controlling a repeater which is connected to a network and which relays a communication of a wireless communication device, the method comprising: a packet reception step of receiving a packet transmitted from a sender wireless communication device to a recipient wireless communication device from the network or the sender wireless communication device;a transmission step of transmitting the packet received in the packet reception step to the recipient wireless communication device;a packet storing step of storing, as a first packet, all of or a predetermined part of the packet transmitted to the recipient wireless communication device; anda packet selection step of comparing all of or a predetermined part of the first packet stored in the packet storing step with all of or a predetermined part of a second packet, other than the first packet received in the packet reception step, and discarding the second packet when the first and second packets match under a predetermined condition;wherein when the packet reception step receives a second packet which has the same sender as the first packet and which does not match the first packet under a predetermined condition, the packet selection step excludes all of or a predetermined part of the stored first packet from a comparison target with all of or a predetermined part of the second packet andwherein when the packet reception step receives a second packet matching the first packet under a predetermined condition prior to transmitting the first packet, the packet selection step compares an error rate of the first packet with an error rate of the second packet, and replaces the first packet stored in the packet storing step with the second packet when the second packet has a smaller error rate than the error rate of the first packet. 5. A wireless communication system comprising sender and recipient repeaters connected to a network, and sender and recipient wireless communication devices which communicate with each other via the repeaters, wherein: the network transmits data or a packet between the sender and recipient repeaters;the sender repeater comprises: a reception unit that receives a packet transmitted from the sender wireless communication device to the recipient wireless communication device;an acquisition unit that acquires identification information of the recipient repeater having a communication area where the recipient wireless communication device which is a destination of the packet received from the sender wireless communication device is present; anda transmission unit that transmits the received packet to the recipient repeater specified by the identification information acquired by the acquisition unit via the network when the recipient repeater specified by the identification information differs from itself; andthe recipient repeater comprises: a packet reception unit that receives a packet transmitted from the sender wireless communication device to the recipient wireless communication device from the network or the sender wireless communication device;a transmission unit that transmits the packet received by the packet reception unit to the recipient wireless communication device which is a destination of the packet;a packet storing unit that stores, as a first packet, all of or a predetermined part of the packet transmitted to the recipient wireless communication device; anda packet selection unit that compares all of or a predetermined part of the first packet stored by the packet storing unit with all of or a predetermined part of a second packet, other than the first packet received by the packet reception unit, and discards the second packet when the first and second packets match under a predetermined condition;wherein when the packet reception unit receives a second packet which has the same sender as the first packet and which does not match the first packet under a predetermined condition, the packet selection unit excludes all of or a predetermined part of the stored first packet from a comparison target with all of or a predetermined part of the second packet andwherein when the packet reception unit receives a second packet matching the first packet under a predetermined condition prior to transmitting the first packet, the packet selection unit compares an error rate of the first packet with an error rate of the second packet, and replaces the first packet stored in the packet storing unit with the second packet when the second packet has a smaller error rate than the error rate of the first packet. 6. The wireless communication system according to claim 5, further comprising a positional information server that communicates with the repeaters, and wherein the positional information server comprises: a positional information storing unit that stores identification information of the recipient wireless communication device in association with identification information of the recipient repeater which can communicate with the recipient wireless communication device;a reception unit that receives an inquiry of searching identification information of the recipient repeater having a communication area where the recipient wireless communication device which is a destination of the packet is present from the sender repeater;a respondence unit that transmits identification information of the recipient repeater which can communicate with the recipient wireless communication device to the repeater which transmits the inquiry when the inquiry is received, the identification information being stored in the positional information storing unit and corresponding to identification information of the recipient wireless communication device contained in the inquiry; andthe acquisition unit of the sender repeater transmits an inquiry of searching identification information of the recipient repeater having a communication area where the recipient wireless communication device which is a destination of the packet is present to the positional information server, and acquires, from the positional information server, identification information of the recipient repeater having a communication area where the recipient wireless communication device is present. 7. A non-transitory computer-readable recording medium storing a control program for a repeater connected to a network and relaying a communication of a wireless communication device, the control program allowing a computer to function as: a packet reception unit that receives a packet transmitted from a sender wireless communication device to a recipient wireless communication device from the network or the sender wireless communication device;a transmission unit that transmits the packet received by the packet reception unit to the recipient wireless communication device which is a destination of the packet;a packet storing unit that stores, as a first packet, all of or a predetermined part of the packet transmitted to the recipient wireless communication device; anda packet selection unit that compares all of or a predetermined part of the first packet stored by the packet storing unit with all of or a predetermined part of a second packet, other than the first packet received by the packet reception unit, and discards the second packet when the first and second packets match under a predetermined condition;wherein when the packet reception unit receives a second packet which has the same sender as the first packet and which does not match the first packet under a predetermined condition, the packet selection unit excludes all of or a predetermined part of the stored first packet from a comparison target with all of or a predetermined part of the second packet, andwherein when the packet reception unit receives a second packet matching the first packet under a predetermined condition prior to transmitting the first packet, the packet selection unit compares an error rate of the first packet with an error rate of the second packet, and replaces the first packet stored in the packet storing unit with the second packet when the second packet has a smaller error rate than the error rate of the first packet.
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이 특허에 인용된 특허 (2)
Kusaki, Tsutomu; Sakamoto, Kenichi; Murakami, Masaru; Yokoyama, Takashi, Handover method in mobile communication system.
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