TDMA communication apparatus
First Claim
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, anda 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, andwherein 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.
1 Assignment
0 Petitions
Accused Products
Abstract
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).
11 Citations
8 Claims
-
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. - View Dependent Claims (2, 3, 4)
-
-
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. - View Dependent Claims (6, 7, 8)
-
Specification