The disclosure provides communication methods and apparatuses. One example method includes that the first access network device obtains a correspondence between the first terminal apparatus and the second terminal apparatus. After obtaining a data packet, the first access network device sends a same data packet to the first terminal apparatus and the second terminal apparatus based on the correspondence, so that the first terminal apparatus and the second terminal apparatus transmit the same data packet to the slave station device.

A communication apparatus includes a function for performing transmission and reception of a wireless signal in a period having a predetermined length which arrives at a predetermined time interval, a function for performing at least one process of the transmission and the reception of the wireless signal in the period as a substitute for a particular communication apparatus belonging to a set of a plurality of communication apparatuses among which the period is synchronized, and a function for deciding whether or not proxy processing is to be performed in accordance with a frequency of periods during which the communication apparatus performs the transmission and the reception of the wireless signal among a plurality of the periods.

A communication apparatus includes a function for performing transmission and reception of a wireless signal in a period having a predetermined length which arrives at a predetermined time interval, a function for performing at least one process of the transmission and the reception of the wireless signal in the period as a substitute for a particular communication apparatus belonging to a set of a plurality of communication apparatuses among which the period is synchronized, and a function for deciding whether or not proxy processing is to be performed in accordance with a frequency of periods during which the communication apparatus performs the transmission and the reception of the wireless signal among a plurality of the periods.

A gunshot detection system synchronizes timing information across gunshot sensor units and/or a control panel. The gunshot sensor units exchange timing information with each other and/or with the control panel, which is then used by the gunshot sensor units to generate the event data for detected gunshot events. In one embodiment, the gunshot sensor units are configured as master and slave nodes. The master node periodically distributes a master time reference to the slave nodes, and the slave nodes calibrate local times based on the master time reference. The slave nodes can detect whether the current master node has become non-functional (e.g. based on a time elapsed since the most recently sent master time reference) and configure a new master node based on exchanging predetermined priority information for the slave nodes.

Systems and methods for network coordination are disclosed. A method comprises listening to a primary device during a receiving slot group of a primary/secondary (P/S) piconet shared between the primary device and the secondary device, determining based on the listening during the receiving slot group whether the primary device is attempting to communicate with the secondary device, listening to a host device on a host piconet during a transmitting slot group of the P/S piconet in response to a determination that the primary device is not attempting to communicate with the secondary device, and transmitting to the primary device over the P/S piconet during the transmitting slot group of the P/S piconet in response to a determination that the primary device is attempting to communicate with the secondary device.

Systems and methods for network coordination are disclosed. A method comprises listening to a primary device during a receiving slot group of a primary/secondary (P/S) piconet shared between the primary device and the secondary device, determining based on the listening during the receiving slot group whether the primary device is attempting to communicate with the secondary device, listening to a host device on a host piconet during a transmitting slot group of the P/S piconet in response to a determination that the primary device is not attempting to communicate with the secondary device, and transmitting to the primary device over the P/S piconet during the transmitting slot group of the P/S piconet in response to a determination that the primary device is attempting to communicate with the secondary device.

Techniques described herein provide for leader selection of a group of vehicles, based on inter-vehicle communications. According to embodiments, a host vehicle can determine it qualifies to be the leader of a potential group by comparing vehicle information of other cars in the potential group with its own vehicle information. Once the determination has been made, the host can then a request to be the group leader to the other vehicles. If the other vehicles accept, the host vehicle can initiate group formation. Otherwise, another vehicle can reject the request and send its own request to become the group leader, reinitiating group leader negotiation until a group leader is determined.

A WiFi data transmission system is provided. The transmission system is in a mesh-tree topology and includes a router and nodes connected to the router via a root node. A node of the nodes includes a station (STA) interface, a soft access point (AP) interface, a bridge interface, and a forwarding database (FDB), for example. Upon receiving a data frame by the node, the bridge interface of the node may search the FDB using information of the data frame for a latest data record to determine an outgoing interface address of the outgoing node so as to guide an outgoing path for the data frame. The structure of transmission system can lead to an improved adaptability and communications efficiency, and a reduced resource consumption.

A WiFi data transmission system is provided. The transmission system is in a mesh-tree topology and includes a router and nodes connected to the router via a root node. A node of the nodes includes a station (STA) interface, a soft access point (AP) interface, a bridge interface, and a forwarding database (FDB), for example. Upon receiving a data frame by the node, the bridge interface of the node may search the FDB using information of the data frame for a latest data record to determine an outgoing interface address of the outgoing node so as to guide an outgoing path for the data frame. The structure of transmission system can lead to an improved adaptability and communications efficiency, and a reduced resource consumption.

A method for configuring a master/slave board during initial booting of dual boards, and dual boards thereof are proposed. Each of the dual boards includes: a voltage input part to which an AC voltage is applied by initial booting; a voltage converter for converting the applied AC voltage into a DC voltage; a communication part for transmitting a DC voltage value corresponding to the converted DC voltage to a counterpart board and receiving a DC voltage value of the counterpart board from the counterpart board; and a controller for initializing the voltage converter when an initial boot signal and the AC voltage are applied from outside, converting the DC voltage converted by the voltage converter into the DC voltage value, and comparing the DC voltage values of each board transmitted and received through the communication part, so as to configure each board as a master or slave board.