摘要:
An interference preventing method prevents communication interference between two or more wireless communication networks having mutually different physical layers, in which wireless communication is performed between a plurality of devices and a coordinator. By using a coordinator of each of the wireless communication networks, a scanning period for scanning a coexistence notification signal that is transmitted from a coordinator of another wireless communication network for a predetermined period is arranged before a first super frame immediately after input of power. The CB of the coordinator is transmitted at least once or more for one super frame, and, in a case where the CB transmitted from the coordinator of the other wireless communication network is acquired during the scanning period, control for preventing communication interference with the other wireless communication network is performed.
摘要:
To prevent communication interference between two or more wireless communication networks that have mutually different physical layers.There is provided an interference preventing method, which prevents communication interference between two or more wireless communication networks having mutually different physical layers, of a wireless communication network in which wireless communication is performed between a plurality of devices 2 and a coordinator 3, wherein, by using a coordinator of each one of the wireless communication networks, a scanning period 26 for scanning a coexistence notification signal that is transmitted from a coordinator of another wireless communication network for a predetermined period is arranged before a first super frame immediately after input of power, the CB 27 of the coordinator is transmitted at least once or more for one super frame, and, in a case where the CB 27 transmitted from the coordinator 3 of the another wireless communication network is acquired during the scanning period 26, control for preventing communication interference with the another wireless communication network 10 is performed.
摘要:
Where two or more wireless communication networks having mutually different physical layers coexist, and wireless communication is performed between a plurality of devices and a coordinator in each one of the wireless communication networks, the coordinator of one wireless communication network generates coexistence notification frame data to notify coordinators of the other wireless communication networks of existence of the coordinator. This first coordinator encodes the generated coexistence notification frame data, inserts source data so as to be set as FEC data, modulates the FEC data through a Gaussian frequency shifting keying system (GFSK) so as to be set as a GFSK modulated wave signal, and transmits the GFSK modulated wave signal to the coordinators of the other wireless communication networks.
摘要:
Where two or more wireless communication networks having mutually different physical layers coexist, and wireless communication is performed between a plurality of devices and a coordinator in each one of the wireless communication networks, the coordinator of one wireless communication network generates coexistence notification frame data to notify coordinators of the other wireless communication networks of existence of the coordinator. This first coordinator encodes the generated coexistence notification frame data, inserts source data so as to be set as FEC data, modulates the FEC data through a Gaussian frequency shifting keying system (GFSK) so as to be set as a GFSK modulated wave signal, and transmits the GFSK modulated wave signal to the coordinators of the other wireless communication networks.
摘要:
A wireless communication terminal that ensures communication using a frequency band suitable for line-of-sight communication even if an obstruction is present in a wireless communication path or a status of a radio wave propagation path dynamically changes. An initial detecting section detects whether it is possible to communicate with another terminal of a master station mode. If communication is possible, a slave-mode setting section sets up a slave station mode, registers the other terminal in a master terminal storage section and transmits to the other terminal a communication indicating that a local terminal is subordinate to the master terminal. If communication is not possible, a master-mode setting section sets up a master station mode when a transmission is received indicating that the other terminal is subordinate to the local terminal. A slave terminal registration section registers the other terminal in a slave terminal storage section. A master station maintenance detection section checks regularly if communication with a slave station is possible. A slave station maintenance detection section checks regularly if communication with a master station is possible. If communication is not possible, an undetermined-mode setting section sets up an undetermined mode and a transmission section transmits a message that is received by a reception section.
摘要:
A cable television system 100 according to the present invention comprises: non-subscriber station devices 400 and 500 having accounting servers 450 and 550, respectively, for each acquiring a delivery historical file having a set of delivery historical information representative of a history of delivering contents from the other non-subscriber station device which has been just before connected to a CATV mobile terminal device 200, to store the acquired delivery historical file therein, and to record the delivery historical information on the stored delivery historical file; and an accounting device 300 having an accounting server 330 for performing an accounting process on the basis of the delivery historical information stored by the accounting servers 450 and 550 of the non-subscriber station devices 400 and 500.
摘要:
Herein are disclosed a cable television system, mobile communication terminal, a relay apparatus, a center apparatus, and a method of providing a cable television service using the system, which enable a user operating a CATV mobile terminal (6) to receive a CATV service regardless of the service area of the CATV station where the user is located. When a vehicle (5) having a CATV mobile terminal (6) mounted thereon moves into a service area of a CATV station (3, 4), the CATV mobile terminal (6) is operated to transmit a log-in request to the CATV station (3, 4). The CATV station (3, 4) is operated to inquire about the user to the subscriber station (2), and the subscriber station (2) is operated to judge whether or not the user is authentic. Subscriber station (2) is operated to deliver common contents to the CATV mobile terminal (6) through the CATV station (3, 4) when it is judged that the user is authentic.
摘要:
Herein disclosed are a mobile communication terminal recognizing system, a mobile communication terminal, a relay apparatus, a center apparatus, and a mobile communication terminal recognizing method, which enable a user to receive contents related to a cable television service, as well as are capable of easily identifying the service area where the user is located and accordingly communicating with the user regardless of whether or not the user moves into a service area other than the service area of the CATV station which the user has subscribed to. When a vehicle (5) moves into a service area of a CATV station (3, 4) other than the service area of the CATV station which the user has subscribed to and a CATV mobile terminal (6) receives contents from the ATV station (3, 4) by wireless, the CATV station (3, 4) is operated to store therein delivery history information indicative of a history of delivering the contents, and the CATV mobile terminal (6) is operated to store therein utilization history information indicative of a history of utilizing the contents. A subscriber station (2) is operated to collect and count the delivery history information and the utilization history information after transmitting an inquiry about the delivery history information and the utilization history information to the CATV station (3, 4) and the CATV mobile terminal (6) by way of multicast communication.
摘要:
The present invention is directed to improve convenience to the user. A path extending from the present location S of a mobile terminal to a destination D via a base station is calculated (S2), distances between base stations on the calculated path and the present location are calculated, and the closest base station is determined as a contents delivery base station (S7). Grace time for the mobile terminal to pass through the contents delivery base station is calculated. Then, scheduled time to deliver the contents to the mobile terminal is calculated (S8). While monitoring a travel state of the mobile terminal (S10 to S12), the contents are delivered to the mobile terminal near the contents delivery base station (S14).
摘要:
Herein are disclosed a cable television system, mobile communication terminal, a relay apparatus, a center apparatus, and a method of providing a cable television service using the system, which enable a user operating a CATV mobile terminal (6) to receive a CATV service regardless of the service area of the CATV station where the user is located. When a vehicle (5) having a CATV mobile terminal (6) mounted thereon moves into a service area of a CATV station (3, 4), the CATV mobile terminal (6) is operated to transmit a log-in request to the CATV station (3, 4). The CATV station (3, 4) is operated to inquire about the user to the subscriber station (2), and the subscriber station (2) is operated to judge whether or not the user is authentic. Subscriber station (2) is operated to deliver common contents to the CATV mobile terminal (6) through the CATV station (3, 4) when it is judged that the user is authentic.