V2X communication device and DCC operation method thereof

1. A decentralized congestion control (DCC) operation method of a V2X communication apparatus, comprising:

receiving, from each of at least one neighboring station, a first transmission packet;

obtaining first channel busy ratio (CBR) sharing information included in the first transmission packet;

based on the first transmission packet, measuring local CBR information on at least one zone, among a plurality of zones, where the at least one neighboring station transmitting the first transmission packet is located;

performing a DCC operation based on at least one of (i) the first CBR sharing information or (ii) the measured local CBR information,

wherein the DCC operation is performed by controlling at least one of a packet transfer rate, a packet size or packet transmit power;

generating a second transmission packet including second CBR sharing information based on (i) the first CBR sharing information and (ii) the measured local CBR information; and

transmitting, to the at least one neighboring station, the second transmission packet.

2. The DCC operation method of claim 1 , wherein the CBR sharing information includes at least one of CBR count information indicating a number of resource pools, CBR ID information indicating a resource pool ID or zone ID corresponding to a CBR value, or CBR information corresponding to the CBR ID.

3. The DCC operation method of claim 2 , wherein the CBR information includes at least one of first CBR information measured by a V2X communication apparatus that has transmitted the CBR sharing information or second CBR information corresponding to a maximum value of CBR values received by the V2X communication apparatus that has transmitted the CBR sharing information.

4. A V2X communication apparatus comprising:

a memory storing memory;

a transceiver for transmitting and receiving radio signals; and

a processor configured to control the memory and the transceiver, wherein the processor is configured to:

receive, from each of at least one neighboring station, a first transmission packet,

obtain first channel busy ratio (CBR) sharing information included in the first transmission packet,

based on the first transmission packet, measure local CBR information on at least one zone, among a plurality of zones, where the at least one neighboring station transmitting the first transmission packet is located,

perform a decentralized congestion control (DCC) operation based on at least one of (i) the first CBR sharing information or (ii) the measured local CBR information,

wherein the DCC operation is performed by controlling at least one of a packet transfer rate, a packet size or packet transmit power,

generate a second transmission packet including second CBR sharing information based on (i) the first CBR sharing information and (ii) the measured local CBR information, and

transmit, to the at least one neighboring station, the second transmission packet.

5. The V2X communication apparatus of claim 4 , wherein the CBR sharing information includes at least one of CBR count information indicating a number of resource pools, CBR ID information indicating a resource pool ID or zone ID corresponding to a CBR value, or CBR information corresponding to the CBR ID.

6. The V2X communication apparatus of claim 5 , wherein the CBR information includes at least one of first CBR information measured by a V2X communication apparatus that has transmitted the CBR sharing information or second CBR information corresponding to a maximum value of CBR values received by the V2X communication apparatus that has transmitted the CBR sharing information.

7. The method of claim 1 , wherein CBR information of different neighboring stations assigned a same zone ID is shared between the different neighboring stations.