Abstract: A data transmission method and apparatus are provided. The method comprises: receiving service data sent by a first terminal, the first terminal being a single-mode terminal or a multi-mode terminal; monitoring forwarding load traffic of a back-end egress of a first network device in a first network; when the load traffic reaches present load traffic, switching a current forwarding mode to a routing mode, and selecting a second terminal as a forwarding node of the first terminal, the second terminal being a multi-mode terminal; forwarding the service data to the second terminal, so that the second terminal coverts the service data and sends the converted service data to a second network device in a second network. According the embodiments of the present invention, the technical problem of a low utilization rate of the total bandwidth of a network egress in the prior art is solved.

Abstract: Embodiments of the present invention disclose a vehicular communication method, including: acquiring a current position of a vehicle; acquiring all fixed APs, the distance from each of which to the current position of the vehicle is smaller than its maximum transmission distance; scanning all the fixed APs in a scheduling period; selecting at least one fixed AP of which signal strength is greater than a preset value in all the fixed APs as a to-be-accessed fixed AP according to the scanning results; and triggering a mobile terminal in the vehicle to respectively access a vehicular AP in the vehicle and the to-be-accessed fixed AP in the scheduling period according to allocated time when an access condition is satisfied. The embodiments of the present invention further disclose a vehicular communication device and system. Through the above technical solutions, the communication bandwidth is increased and bulk data service is supported.

Abstract: A data transmission method and apparatus are provided. The method comprises: receiving service data sent by a first terminal, the first terminal being a single-mode terminal or a multi-mode terminal; monitoring forwarding load traffic of a back-end egress of a first network device in a first network; when the load traffic reaches present load traffic, switching a current forwarding mode to a routing mode, and selecting a second terminal as a forwarding node of the first terminal, the second terminal being a multi-mode terminal; forwarding the service data to the second terminal, so that the second terminal coverts the service data and sends the converted service data to a second network device in a second network. According the embodiments of the present invention, the technical problem of a low utilization rate of the total bandwidth of a network egress in the prior art is solved.

Abstract: Embodiments of the present invention disclose a vehicular communication method, including: acquiring a current position of a vehicle; acquiring all fixed APs, the distance from each of which to the current position of the vehicle is smaller than its maximum transmission distance; scanning all the fixed APs in a scheduling period; selecting at least one fixed AP of which signal strength is greater than a preset value in all the fixed APs as a to-be-accessed fixed AP according to the scanning results; and triggering a mobile terminal in the vehicle to respectively access a vehicular AP in the vehicle and the to-be-accessed fixed AP in the scheduling period according to allocated time when an access condition is satisfied. The embodiments of the present invention further disclose a vehicular communication device and system. Through the above technical solutions, the communication bandwidth is increased and bulk data service is supported.