TDMA communication apparatus
원문보기
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
UP-0887965
(2006-04-06)
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등록번호 |
US-7796636
(2010-10-04)
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우선권정보 |
JP-2005-111170(2005-04-07) |
국제출원번호 |
PCT/JP2006/307365
(2006-04-06)
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§371/§102 date |
20080220
(20080220)
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국제공개번호 |
WO06/109689
(2006-10-19)
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발명자
/ 주소 |
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출원인 / 주소 |
- Furuno Electric Company, Limited
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대리인 / 주소 |
Birch, Stewart, Kolasch & Birch, LLP
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인용정보 |
피인용 횟수 :
2 인용 특허 :
7 |
초록
▼
A TDMA communication apparatus is configured for transmitting DSC response signals while preventing overlapping with AIS. A CPU 1 computes the DSC transmission time length Tdsc of a DSC response command (S11) and detects the present time t0 (S12). CPU 1 computes an AIS transmission standby time leng
A TDMA communication apparatus is configured for transmitting DSC response signals while preventing overlapping with AIS. A CPU 1 computes the DSC transmission time length Tdsc of a DSC response command (S11) and detects the present time t0 (S12). CPU 1 computes an AIS transmission standby time length Taistx and compares it with the DSC transmission time length Tdsc (S13 to S14). Next, if the DSC transmission time length Tdsc is shorter, CPU 1 computes an AIS reception standby time length Taisrx and compares it with the DSC transmission time length Tdsc (S15 to S16). If the DSC transmission time length Tdsc is shorter, CPU 1 effectuates transmission control (S17).
대표청구항
▼
The invention claimed is: 1. A Time Division Multiple Access (TDMA) communication apparatus that, by allocating a plurality of slots to a single frame in a time-divided manner, effects transmission of a first communication signal during slots reserved by communicating stations by performing respect
The invention claimed is: 1. A Time Division Multiple Access (TDMA) communication apparatus that, by allocating a plurality of slots to a single frame in a time-divided manner, effects transmission of a first communication signal during slots reserved by communicating stations by performing respective slot synchronization and, along with that, effects transmission of a second communication signal without the slot synchronization being performed, the apparatus comprising: a reserved slot storage unit that stores reserved slots for each of the stations, an overlapping reserved slot storage unit that stores corresponding slots as overlapping reserved slots when the present station's transmission is subject to reservation by another station, and a control unit that, along with computing a transmission time length for the second communication signal being transmitted, computes a standby time length from the present time until the time of receipt of the first communication signal or the time of transmission of the next first communication signal read from the reserved slot storage unit, effects transmission control over the second communication signal if the transmission time length is detected to be shorter than the standby time length, holds the second communication signal pending if the transmission time length is detected to be longer than the standby time length, and wherein at the timing when compilation starts for the overlapping reserved slots, the control unit selects a signal transmitted during the overlapping reserved slots based on information from the overlapping reserved slot storage unit. 2. The TDMA communication apparatus according to claim 1, comprising a receipt detection unit that detects receipt of the first communication signal, wherein the control unit effects transmission control over the second communication signal when it is determined that the receipt detection unit has not detected receipt of the first communication signal. 3. The TDMA communication apparatus according to claim 2, wherein the receipt detection unit detects receipt using timing delayed from the slot start timing by a predetermined time within the same slot. 4. The TDMA communication apparatus according to claim 1, wherein the first communication signal is an Automatic Identification System (AIS) signal and the second communication signal is a Digital Selective Calls (DSC) signal. 5. A Time Division Multiple Access (TDMA) communication apparatus that, by allocating a plurality of slots to a single frame in a time-divided manner, effects transmission of a first communication signal during slots reserved by communicating stations by performing respective slot synchronization and, along with that, effects transmission of a second communication signal without the slot synchronization being performed, the apparatus comprising: a reserved slot storage unit that stores reserved slots for each of the stations, and a control unit that, along with computing a transmission time length for the second communication signal being transmitted, computes a standby time length from the present time until the time of receipt of the first communication signal or the time of transmission of the next first communication signal read from the reserved slot storage unit, effects transmission control over the second communication signal if the transmission time length is detected to be shorter than the standby time length, holds the second communication signal pending if the transmission time length is detected to be longer than the standby time length, and wherein the control unit effects operation initiation control over a transmission reference frequency generation unit using a slot start timing moved back by a predetermined number of slots and the oscillation stabilization time of the transmission reference frequency generation unit from a transmission start timing of the first communication signal and second communication signal. 6. The TDMA communication apparatus according to claim 5, comprising a receipt detection unit that detects receipt of the first communication signal, wherein the control unit effects transmission control over the second communication signal when it is determined that the receipt detection unit has not detected receipt of the first communication signal. 7. The TDMA communication apparatus according to claim 6, wherein the receipt detection unit detects receipt using timing delayed from the slot start timing by a predetermined time within the same slot. 8. The TDMA communication apparatus according to claim 5, wherein the first communication signal is an Automatic Identification System (AIS) signal and the second communication signal is a Digital Selective Calls (DSC) signal.
이 특허에 인용된 특허 (7)
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Kim, Tae Wook, Antenna sharing apparatus of base station in W-CDMA system.
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Castellano, Robert, Apparatus and method for communicating time-division multiplexed data and packet data on a shared bus.
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Dahlin Jan E. ÅS. (Jrflla SEX), Method and system for uniquely identifying control channel time slots.
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Jheroen Pieter Dorenbosch ; Eduardo Guntin, Method for transmitting collision-free messages in a digital selective call signaling protocol.
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Ruziak, Yaron, Network communications link.
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Stobart,Christopher, Synchronous TDD system.
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Rogers,Charles David, System and apparatus for automatic and continuous monitoring, proactive warning and control of one or more independently operated vessels.
이 특허를 인용한 특허 (2)
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Kim, Sung Kyung; Chang, Sung Cheol; Lim, Kwang Jae; Yoon, Chul Sik, Radio resource reallocating method for circuit mode.
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Longhurst, Phil, Reversible TDD transceiver.
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