Method by which first server transmits second message in wireless communication system, and device therefor
A first sever receives a plurality of vulnerable road user (VRU) messages; transmits a first message to a second server on the basis of VRU information obtained from the plurality of VRU messages; and transmits , to VRU devices, a second message including second cluster information based on the first message including first cluster information, wherein, based on a presence of VRU messages satisfying cluster conditions among the plurality of VRU messages, the first message includes the first cluster information for a cluster formed for the VRU messages, and the second cluster information includes information on a first cluster region for the cluster, and information on an expected time and a second cluster region associated with the expected time.
1 . A method of transmitting, by a first server, a second message in a wireless communication system, the method comprising:
receiving a plurality of vulnerable road user (VRU) messages;
transmitting a first message to a second server based on VRU information obtained from the plurality of VRU messages; and
transmitting the second message comprising second cluster information to VRU devices based on the first message comprising first cluster information,
wherein, based on a presence of VRU messages satisfying cluster conditions among the plurality of VRU messages, the first message comprises the first cluster information on a cluster formed based on the VRU messages, and
wherein the second cluster information comprises information on a first cluster area of the cluster and information on an expected time and a second cluster area related to the expected time.
2 . The method of claim 1 , wherein the expected time is to specify a period during which VRU devices located in the first cluster area stop transmitting VRU messages.
3 . The method of claim 1 , wherein the second cluster information further comprises information on a reference position for specifying a representative VRU device configured to transmit a cluster message as a representative of VRU devices located in the first cluster area.
4 . The method of claim 3 , wherein the first cluster information is updated based on the cluster message transmitted by the representative VRU device.
5 . The method of claim 3 , wherein the cluster message comprises cluster information related to the second cluster area and is received at a point in time corresponding to the expected time.
6 . The method of claim 3 , wherein the second cluster area is an area related to determining whether the VRU devices resume transmission of VRU messages after the expected time.
7 . The method of claim 1 , wherein based on a number of VRU messages each comprising information on a position within a predetermined threshold distance being greater than or equal to a cluster threshold number, the first cluster area is configured based on position information in the VRU messages.
8 . The method of claim 1 , wherein the first message is an advanced message queuing protocol (AMQP) message exchanged between servers.
9 . The method of claim 1 , wherein the first server is configured to specify the second server to which the first server is to transmit the first message, based on clustering request messages received from a plurality of servers connected to the first server.
10 . The method of claim 9 , wherein the first message is not transmitted to a server transmitting a request message for a cluster area different from the first cluster area among the plurality of servers.
11 . A method of receiving, by a device, cluster information from a first server in a wireless communication system, the method comprising:
transmitting a VRU (vulnerable road user) message to the first server;
receiving a second message comprising the cluster information from the first server; and
stopping the transmission of the VRU message based on the cluster information,
wherein the cluster information comprises information on a first cluster area configured based on predetermined cluster conditions and information on an expected time and a second cluster area related to the expected time, and
wherein based on a position of the device being within the first cluster area, the transmission of the VRU message stops until the expected time.
12 . A first server configured to transmit a second message in a wireless communication system, the first server comprising:
a radio frequency (RF) transceiver; and
a processor connected to the RF transceiver,
wherein the processor is configured to:
control the RF transceiver to receive a plurality of vulnerable road user (VRU) messages;
transmit a first message to a second server based on VRU information obtained from the plurality of VRU messages; and
transmit the second message comprising second cluster information to VRU devices based on the first message comprising first cluster information,
wherein, based on a presence of VRU messages satisfying cluster conditions among the plurality of VRU messages, the first message comprises the first cluster information on a cluster formed based on the VRU messages, and
wherein the second cluster information comprises information on a first cluster area of the cluster and information on an expected time and a second cluster area related to the expected time.