Patent ID: 11924736
Assignee: JAPAN RADIO CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. A wireless communication system comprising:
a wireless communication unit group including two or more wireless communication units disposed to be sequentially adjacent,
wherein each of the wireless communication unit is configured to perform wireless network communication with a mobile terminal in accordance with a communication protocol stack defined in Third Generation Partnership Project (3GPP), and includes
a wireless base station portion to which the mobile terminal is connectable via a terminal wireless bearer,
an Evolved Packet Core (EPC) function portion connected by wire to the wireless base station portion and functions as an upper network control portion for the wireless base station portion, and
a relay wireless communication portion that is connected by wire to the EPC function portion, and is also connectable to an upstream wireless base station portion of an upstream unit that is another first wireless communication unit via an upstream inter-unit wireless bearer,
wherein the wireless base station portion is connectable to a downstream relay wireless communication portion of a downstream unit that is another second wireless communication unit via a downstream inter-unit wireless bearer,
the EPC function portion transmits a terminal wireless bearer setting request to the wireless base station portion, and the wireless base station portion constructs the terminal wireless bearer together with the mobile terminal according to conditions indicated by the terminal wireless bearer setting request
the relay wireless communication portion receives an -afi—upstream inter-unit wireless bearer setting request issued by an upstream EPC function portion of the upstream unit, and constructs the upstream inter-unit wireless bearer together with the upstream wireless base station portion according to conditions indicated by the upstream inter-unit wireless bearer setting request, and
the EPC function portion
includes a connected terminal node registration section in which, with respect to a plurality of the mobile terminals connected to the wireless base station portion via the terminal wireless bearer within a communication area of the wireless base station portion, pieces of node identification information of the connected mobile terminals are
registered, and performs control of collating a transmission destination node of an IP packet transferred from the wireless base station portion with registered content of the connected terminal node registration section, transferring, when the transmission destination node indicates a mobile terminal corresponding to any of the pieces of node identification information registered in the connected terminal node registration section, the IP packet to the mobile terminal in a form of returning the IP packet at the wireless base station portion, and transferring, when the transmission destination node indicates a node that is not registered in the connected terminal node registration section, the IP packet to a transmission destination outside the wireless communication unit from at least one of the relay wireless communication portion and the wireless base station portion,
wherein the wireless communication unit group is connected by the inter-unit wireless bearer in a positional relationship in which base station cells of a pair of wireless communication units adjacent to each other partially overlap each other, and
a mobile terminal connected to one of the pair of wireless communication units and a mobile terminal connected to the other thereof perform transmission and reception of the IP packet via the pair of wireless communication units and the inter-unit wireless bearer connecting the pair of wireless communication units.