Communication system

摘要

A communication system which can automatically construct a network, as well as reducing power consumption of each node in the network is provided.;A child node calculates a timing of next receiving broadcast information based on timing information included in broadcast information. It then accepts input of broadcast information transmitted from a management node and transmits a registration request. It further accepts input of broadcast information transmitted from the management node and determines whether or not it is registered in the network based on slot assignment information included in the broadcast information. If the child node determines that it is registered in the network, it calculates a timing for receiving a reply request transmitted from the management node.

主权项

1. A communication system comprising a plurality of terminals and a management node which manages states of the terminals, wherein:
the management node includes a communication unit which performs data transmission and reception with the terminals according to a structure of one superframe defining one cycle of data communication, and a control unit which controls the entire management node, the one superframe includes at least one broadcast period for broadcasting broadcast information indicating a structure of the one superframe, each of the terminals outputs a response signal to the broadcast information according to the content of the broadcast information, the control unit, upon receiving a response signal to the broadcast information transmitted via the communication unit, adds, to the structure of one superframe, a data communication period assigned for transmitting and receiving data to and from the terminal which received the response signal to the broadcast information, updates the broadcast information indicating the structure of one superframe, according to the addition of the data communication period, at least one of the terminals which received the updated broadcast information transmits and receives data to and from the management node in synchronization with the data communication period assigned for its own sake, according to the updated broadcast information, the communication unit transmits a data request signal requesting data to one of the assigned terminals in the data communication period, one of the assigned terminals which received the data request signal transmits a data response signal to the communication unit in response to the data request signal, when the broadcast information indicating the structure of one superframe is updated according to an instruction to add the data communication period, the communication unit transmits, together with the data request signal, a notification signal notifying that the structure of one superframe is changed in the data communication period, and one of the assigned terminals which received the notification signal together with the data request signal receives the updated broadcast information included in the subsequent one superframe.