Communication system

Abstract

Provided is a high-speed communication system with the high reliability and the low latency under New Radio (NR). A base station device includes a plurality of distributed units (DUs, 802) that transmit and receive radio signals, and a central unit (CU, 801) that controls the plurality of DUs (802). The CU (801) duplicates a downlink packet addressed to a communication terminal device (804), and forwards the duplicated downlink packet to each of at least two DUs (802) among the plurality of DUs (802). Each of the at least two of the DUs (802) transmits, to the communication terminal device (804) by the radio signal, the downlink packet obtained from the CU (801). Upon redundant receipt of the downlink packets, the communication terminal device (804) removes a redundant downlink packet in accordance with a predefined downlink packet removal criterion.

1 . A communication system comprising:
 a communication terminal device, and
 a base station device configured to perform radio communication with the communication terminal device, 
   wherein the base station device includes:   a plurality of distributed units (DUs) that transmit and receive radio signals; and   a central unit (CU) that controls the plurality of DUs,   the communication terminal device transmits, to each of two or more of the plurality of DUs, a duplicated uplink packet of an uplink packet to be transmitted from the communication terminal device, and   upon redundant receipt of the uplink packets, the base station device removes a redundant uplink packet in accordance with a predefined uplink packet removal criterion.   
     
     
         2 . The communication system according to  claim 1 ,
 wherein the CU duplicates a downlink packet addressed to the communication terminal device, and forwards the duplicated downlink packet to each of at least two DUs among the plurality of DUs,   each of the at least two DUs transmits, to the communication terminal device by the radio signal, the downlink packet obtained from the CU, and   upon redundant receipt of the downlink packets, the communication terminal device removes a redundant downlink packet in accordance with a predefined downlink packet removal criterion.   
     
     
         3 . The communication system according to  claim 2 ,
 wherein the CU forwards the duplicated downlink packet to each of at least two DUs determined by the CU among the plurality of DUs.