Patent ID: 8526365
Filing Date: 2013-09-03
Classification: H04W

Abstract:
1. A network system comprising one core node and a plurality of slave nodes, wherein each of the slave nodes includes: a transmission buffer for storing a downlink packet transmitted from the core node to another slave node and an uplink packet transmitted from a slave node to the core node; a plurality of communication means for receiving a packet from another node and transmitting a packet stored in the transmission buffer to another node, and the plurality of communication means being set with two kinds of priorities of, a downlink priority and an uplink priority; transmission ready packet selection means for selecting a transmission ready packet from among the packets stored in the transmission buffer; and communication control means for selecting one communication means according to the downlink priority when the transmission ready packet is the downlink packet or according to the uplink priority when the transmission ready packet is the uplink packet, and causing the selected communication means to transmit the transmission ready packet, and wherein the core node includes: a transmission buffer for storing a packet; a plurality of communication means for receiving a packet from a slave node, transmitting a packet stored in the transmission buffer to a slave node, and the plurality of communication means being set with two kinds of priorities of, a downlink priority and an uplink priority; transmission ready packet selection means for selecting a transmission ready packet from among the packets stored in the transmission buffer; and communication control means for selecting one communication means according to the downlink priority, and causing the selected communication means to go through a transmission waiting state to transmit the transmission ready packet, thereby defining a predetermined period as a period from when a transmission of a previous packet on the communication means is finished to when the transmission ready packet is transmitted, and wherein the communication control means of the core node and/or the slave node selects communication means having the highest priority in a case where not more packets than a predetermined number PNT are stored in the transmission buffer, and in a case where more packets than the predetermined number PNT are stored in the transmission buffer, the communication control means of the core node and/or the slave node selects communication means having a subsequently highest priority next to the previously selected communication means when the previously selected communication means is not communication means having the lowest priority, and selects communication means having the highest priority when the previously selected communication means is the communication means having the lowest priority.