Wireless network system and communications method
A wireless network system for enabling good communications, while minimizing the electricity consumption of a portable terminal, is described. Included are: a first relay device 4 a including first and second Bluetooth® (BT) modules {circle around (1)} and {circle around (2)}. Each of the BT modules performs a cable communication irrespective of which is a master/slave. The system also includes a second relay device 4 b including a fourth BT module {circle around (4)}; a wireless terminal 3 including a third BT module {circle around (3)}; and a wireless terminal 3 including a fifth BT module. The first and third BT modules structure a first piconet in which the first BT model {circle around (1)} is a master and the third BT module {circle around (3)} is a slave, and the second, fourth, and fifth BT modules structure a second Piconet in which the fourth BT module {circle around (4)} is a master, and the second and fifth BT modules {circle around (2)} and {circle around (5)} are slaves.
1. A wireless network system for use with two vehicles, said system comprising:
a first relay device including first and second Bluetooth® modules, each of the first and second Bluetooth® modules capable of performing a cable communication irrespective of which is a master or slave, wherein said relay device is configured to be mounted to a first vehicle of said two vehicles; and
at least one first wireless terminal including a third Bluetooth® module,
wherein the first and third Bluetooth® modules structure a first piconet in which the first Bluetooth® module is a master, and the third Bluetooth® module is a slave,
the second Bluetooth® module structures a second piconet;
and wherein the first piconet and the second piconet structure a network,
a second relay device including a fourth Bluetooth® module, wherein said second relay is configured to be mounted to a second vehicle of said two vehicles; and
at least one second wireless terminal including a fifth Bluetooth® module,
wherein the second, fourth, and fifth Bluetooth® modules structure a second piconet in which the fourth Bluetooth® module is a master, and the second and fifth Bluetooth® modules are slaves.
2. The wireless network system according to claim 1 , wherein the second, fourth, and fifth Bluetooth® modules communicate with one another with transmission electricity conforming to a class 1 of a Bluetooth® standard.
3. The wireless network system according to claim 2 , wherein the fifth Bluetooth® module includes means for restricting transmission electricity.
4. The wireless network system according to claim 1 , comprising:
a second relay device including fourth and sixth Bluetooth® modules, each of the fourth and sixth Bluetooth® modules capable of performing a cable communication irrespective of which is a master or slave, wherein said second relay device is configured to be mounted to a second vehicle of said two vehicles;
at least one second wireless terminal including a fifth Bluetooth® module;
the second and fourth Bluetooth® modules structure a third piconet in which the fourth Bluetooth® module is a master, and the second Bluetooth® module is a slave;
wherein the fifth and sixth Bluetooth® modules structure a third piconet in which the sixth Bluetooth® module is the master, and the fifth Bluetooth® module is the slave; and
wherein the first, second, and third piconets structure a network.
5. The wireless network system according to claim 4 , wherein the second and fourth Bluetooth® modules communicate with each other with transmission electricity conforming to a class 1 of a Bluetooth® standard.
6. The wireless network system according to claim 4 , wherein the fifth and sixth Bluetooth® modules communicate with each other with transmission electricity conforming to a class 2 or 3 of a Bluetooth® standard.
7. The wireless network system according to claim 4 , wherein, in the second relay device, the fourth and sixth Bluetooth® modules are controlled by common control means.
8. The wireless network system according to claim 7 , wherein the fourth and sixth Bluetooth® modules and the control means are connected together via a bus.
9. The wireless network system according to claim 1 , wherein the first and third Bluetooth® modules communicate with each other with transmission electricity conforming to a class 2 or 3 of a Bluetooth® standard.
10. The wireless network system according to claim 1 , wherein an SCO link or an ACL link is established between the Bluetooth® modules.
11. The wireless network system according to claim 1 , wherein, in the first relay device, the first and second Bluetooth® modules are controlled by common control means.
12. The wireless network system according to claim 11 , wherein the first and second Bluetooth® modules and the control means are connected together via a bus.
13. A wireless communications method in a wireless network system constructed by a plurality of Bluetooth® terminals for use on two vehicles, wherein the system comprises:
a first relay device including first and second Bluetooth® modules, each of the Bluetooth® modules performs a cable communication irrespective of which is a master/slave, wherein said first relay device is configured to be mounted to a first vehicle of said two vehicles, and
a second relay device including a fourth Bluetooth® module, said second relay device being configured to be mounted on a second vehicle of said two vehicles; and
at least one first wireless terminal including a third Bluetooth® module, and at least one second wireless terminal including a fifth Bluetooth® module, and
in the method,
the first and third Bluetooth® modules communicate with each other on a first piconet in which the first Bluetooth® module is a master, and the third Bluetooth® module is a slave,
the second Bluetooth® module communicates with any one of the other Bluetooth® modules on a second piconet, and
the second, fourth, and fifth Bluetooth® modules communicate with one another on a second piconet in which the fourth Bluetooth® module is a master, and the second and fifth Bluetooth® modules are a slaves, and
the first piconet and the second piconet structure a network.
14. The wireless communications method in a wireless network system according to claim 13 , wherein the second, fourth, and fifth Bluetooth® modules communicate with one another with transmission electricity conforming to a class 1 of a Bluetooth® standard.
15. The wireless communications method in a wireless network system according to claim 14 , wherein the fifth Bluetooth® module restricts transmission electricity.
16. The wireless communications method in a wireless network system according to claim 14 , wherein
the system comprises:
a second relay device including fourth and sixth Bluetooth® modules, and each of the Bluetooth® modules performs a cable communication irrespective of which is a master/slave, wherein said second relay device is configured to be mounted on a second vehicle; and
at least one second wireless terminal including a fifth Bluetooth® module, and
in the method,
the second and fourth Bluetooth® modules communicate with one another on a third Piconet in which the fourth Bluetooth® module is a master, and the second Bluetooth® module is a slave,
the fifth and sixth Bluetooth® modules communicate with each other on a third piconet in which the sixth Bluetooth® module is the master, and the fifth Bluetooth® module is the slave, and
the first, second, and third piconets structure a network.
17. The wireless communications method in a wireless network system according to claim 16 , wherein the second and fourth Bluetooth® modules communicate with each other with transmission electricity conforming to a class 1 of a Bluetooth® standard.
18. The wireless communications method in a wireless network system according to claim 16 , wherein the fifth and sixth Bluetooth® modules communicate with each other with transmission electricity conforming to a class 2 or 3 of a Bluetooth® standard.
19. The wireless communications method in a wireless network system according to claim 16 , wherein, in the second relay device, the fourth and sixth Bluetooth® modules are controlled by common control means.
20. The wireless communications method in a wireless network system according to claim 19 , wherein the fourth and sixth Bluetooth® modules and the control means are connected together via a bus.
21. The wireless communications method in a wireless network system according to claim 13 , wherein the first and third Bluetooth® modules communicate with each other with transmission electricity conforming to a class 2 or 3 of a Bluetooth® standard.
22. The wireless communications method in a wireless network system according to claim 13 , wherein an SCO link or an ACL link is established between the Bluetooth® modules.
23. The wireless communications method in a wireless network system according to claim 13 , wherein, in the first relay device, the first and second Bluetooth® modules are controlled by common control means.
24. The wireless communications method in a wireless network system according to claim 23 , wherein the first and second Bluetooth® modules and the control means are connected together via a bus.