Communication system and base station device

摘要

In a wireless base station device, a PDCP buffer unit temporarily stores data sent from a core network device for the purpose of sending the data to a mobile station device. A data measurement unit measures the volume of data stored in a PDCP buffer unit. On the basis of a measurement value of the data volume measured by the data measurement unit, the congestion state determination unit determines whether or not the PDCP buffer unit is in a congestion state. In the core network device, a sending data storage unit stores data to be sent to the wireless base station device. On the basis of a result of the determination by the congestion state determination unit, a transmission/reception unit sends the data stored in the sending data storage unit to the wireless base station device. In this way, loss of data communicated between the communication devices is reduced.

主权项

1. A communication system including a second communication device which sends data to a first communication device, and also including a third communication device which sends data to said second communication device, and also corresponding to PDCP (Packet Data Convergence Protocol), the communication system comprising:
a buffer unit which is provided in said second communication device comprising a processor and temporarily stores the data sent from said third communication device for the purpose of sending the data to said first communication device; a data measurement unit which is executed by the processor in said second communication device and measures the volume of the data stored in said buffer unit; a sending data storage unit which is provided in said third communication device and stores the data to be sent to said second communication device; a transmission unit which is provided in said third communication device and sends the data stored in said sending data storage unit to said second communication device; and a congestion state determination unit which is executed by the processor in said second communication device and, on the basis of a measurement value of said data volume measured by said data measurement unit, determines whether or not said buffer unit is in a congestion state, wherein, said second communication device is provided with a congestion state notification unit, executed by the processor, which, when said congestion state determination unit has determined that said buffer unit is in a congestion state, notifies said third communication device of said buffer unit being in the congestion state, as congestion state information, by putting the information on a new message or a new parameter of the S1 Application protocol (S1-AP) or the GPRS Tunneling Protocol for User Plane (GTP-u), and wherein, said transmission unit sends the data stored in said sending data storage unit to said second communication device, on the basis of said congestion state information sent by said congestion state notification unit.