公开(公告)号：US20170048894A1

公开(公告)日：2017-02-16

申请号：US15234997

申请日：2016-08-11

Applicant: Korea Railroad Research Institute

Inventor： Sang Won CHOI ,  Ju Yeop KIM ,  Yong Soo SONG ,  Yong Kyu KIM

IPC: H04W76/00 ,  H04W4/08 ,  H04W4/10

CPC classification number: H04W76/45 ,  H04W4/08 ,  H04W4/10 ,  H04W76/50

Abstract: A method of Mission Critical Push to Talk (MCPTT) service performed by a mobile terminal includes: generating, at the mobile terminal, a group call announcement for off-network Mission Critical Push to Talk (MCPTT) service, the group call announcement for off-network MCPTT service including information of a period of the group call announcement for off-network MCPTT service; controlling a transceiver to periodically transmit, to one or more mobile terminals, the group call announcement for off-network MCPTT service based on the period; in response to the transmitted group call announcement for off-network MCPTT service, receiving a response from the one or more mobile terminals; and establishing, based on the response from the one or more mobile terminals, a group call with the one or more mobile terminals by setting a direct wireless communication with the one or more mobile terminals.

Abstract translation: 由移动终端执行的关键任务通信（MCPTT）服务的方法包括：在移动终端处生成用于离网任务关键一键通（MCPTT）服务的群组通话通知，组呼呼叫关闭 网络MCPTT服务，包括网络外MCPTT服务的群组通话周期信息; 基于该周期，控制收发器周期性地向一个或多个移动终端发送用于离网网络MCPTT服务的群呼通知; 响应于所发送的用于离网MCPTT服务的组呼通知，接收来自所述一个或多个移动终端的响应; 以及基于来自所述一个或多个移动终端的响应，通过设置与所述一个或多个移动终端的直接无线通信来建立与所述一个或多个移动终端的群组呼叫。

公开(公告)号：US20160365951A1

公开(公告)日：2016-12-15

申请号：US15072982

申请日：2016-03-17

Applicant: KOREA RAILROAD RESEARCH INSTITUTE

Inventor： Sang Won CHOI ,  Ju Yeop KIM ,  Yong Soo SONG ,  Yong Gyu KIM

IPC: H04L1/08 ,  H04L1/16

CPC classification number: H04L1/08 ,  H04L1/1607 ,  H04L1/1829 ,  H04L1/1867

Abstract: Provided is a method for retransmitting received data using index coding and statistical characteristics in a method for transmitting packets, by a transmitter, to at least two receivers in a wireless communication network and retransmitting packets which are not received correctly by each receiver, wherein the transmitter receives a reception acknowledgement response signal for the packets transmitted to the receiver and analyzes received patterns of the reception acknowledgement response signals transmitted from the receiver to differently perform index coding for each received pattern on the packets which are not received correctly by the receiver and retransmit the index-coded packets. According to the exemplary embodiment of the present invention, it is possible to effectively reduce a retransmission frequency of the packets which are not received correctly and a channel use frequency on communications and effectively use limited radio resources.

Abstract translation: 提供了一种用于在由无线通信网络中的发射机向至少两个接收机发送分组的方法中的索引编码和统计特性的接收数据的重传方法，并且重传未被每个接收机正确接收到的分组，其中发射机 接收发送到接收机的分组的接收确认响应信号，并且分析从接收机发送的接收确认响应信号的接收模式，以对接收机未正确接收到的分组对每个接收模式不同地执行索引编码，并重发 索引编码数据包。 根据本发明的示例性实施例，可以有效地减少未正确接收的分组的重传频率和通信上的信道使用频率，并有效地使用有限的无线电资源。