Operation method associated with forwarder terminal in group driving in wireless communication system
An embodiment is an operation method of a first terminal in a wireless communication system, the method comprising the steps of: receiving, by the first terminal, channel access authority from a second terminal; transmitting, by the first terminal, a message received from the second terminal; and transmitting, by the first terminal, the channel access authority to a next terminal of the second terminal which has transmitted the channel access authority.
1. A method for operating a second user equipment (UE) in a wireless communication system comprising:
establishing, by the second UE, a direct link with a third UE,
selecting, by the second UE, a first UE as a UE for relaying,
receiving, by the second UE, a first message and a channel access authority from the third UE, and
transmitting, by the second UE, the first message received from the third UE to the first UE, based on the channel access authority;
wherein the second UE selects the first UE for relaying, based on the channel access authority, and
wherein the channel access authority is transmitted to the first UE for selection of another UE for relaying.
2. The method according to claim 1 , wherein:
the first user equipment (UE) corresponds to the number of hops determined based on a coverage.
3. The method according to claim 2 , wherein:
when the first user equipment (UE) is a UE having a smaller number of hops than the number of hops from the second user equipment (UE), the first user equipment (UE) transmits the channel access authority to a leader of a platoon including the UEs.
4. The method according to claim 2 , wherein:
the coverage is included in a UE platoon including the first UE and the second UE.
5. The method according to claim 1 , wherein:
a plurality of user equipment (UEs) included in a UE platoon including the first user equipment (UE) is configured to perform message transmission only upon receiving the channel access authority.
6. The method according to claim 1 , wherein:
each of the first user equipment (UE) and the second user equipment (UE) is a user equipment (UE) or a platoon vehicle related to a vehicle configured to perform platooning.
7. The method according to claim 6 , wherein:
the first user equipment (UE) is a platoon forwarder UE.
8. The method according to claim 1 , wherein:
the message corresponds to retransmission of the message received from the second user equipment (UE).
9. The method according to claim 7 , wherein the message includes at least one of:
platoon vehicle (PV) order information about a message transmission user equipment (UE) having current channel access authority;
platoon vehicle (PV) order information about a message transmission UE having a next channel access authority;
platoon vehicle (PV) order information about a platoon forwarder having current channel access authority;
platoon vehicle (PV) order information about a platoon forwarder having a next channel access authority;
platoon vehicle (PV) order information about a platoon forwarder having a next channel access authority;
identifier (ID) information about a message transmission UE having current channel access authority;
identifier (ID) information about a message transmission UE having a next channel access authority;
identifier (ID) information about a platoon forwarder having current channel access authority;
identifier (ID) information about a platoon forwarder having a next channel access authority;
identifier (ID) information about a platoon forwarder having a next channel access authority;
message generation time information transmitted from a user equipment (UE) having current channel access authority; and
information about a total number of vehicles participating in platooning.
10. The method according to claim 1 , wherein:
the first user equipment (UE) transmits the message after waiting for a predetermined standby time related to collision avoidance.
11. A second user equipment (UE) in a wireless communication system comprising:
at least one processor; and
at least one memory operatively connected to the at least one processor, and configured to store instructions such that the at least one processor performs specific operations by executing the instructions,
wherein the specific operations include:
establishing a direct link with a third UE,
selecting a first UE as a UE for relaying,
receiving a first message and a channel access authority from the third UE, and
transmitting the first message received from the third UE to the first UE, based on the channel access authority; and
wherein the second UE selects the first_UE for relaying, based on the channel access authority, and
wherein the channel access authority is transmitted to the first UE for selection of another UE for relaying.