Resource allocation method and device for supporting vehicle communication in next generation mobile communication system
Disclosed are: a communication technique for merging, with IOT technology, a 5G communication system for supporting a data transmission rate higher than that of a 4G system; and a system therefor. The present disclosure can be applied to intelligent services (for example, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail, security, and safety-related services, and the like) based on 5G communication technology and IoT-related technology. A method of a terminal in a wireless communication system, according to the present invention, comprising: receiving system information including a V2X parameter; receiving a data packet based on the V2X parameter; and updating a state variable on the data packet when the data packet is related to a new service, wherein a sequence number included in the state variable is updated based on a sequence number of a data packet received for the first time.
1. A method performed by a first terminal in a communication system, the method comprising:
obtaining a plurality of sidelink medium access control (MAC) service data units (SDUs);
generating a sidelink MAC protocol data unit (PDU) including a sidelink MAC PDU header, a first sidelink MAC subheader, a first sidelink MAC SDU, a second sidelink MAC subheader, and a second sidelink MAC SDU, wherein the first sidelink MAC SDU is placed in front of the second sidelink MAC subheader and the second sidelink MAC SDU; and
transmitting, to a second terminal, the sidelink MAC PDU,
wherein each of the first sidelink MAC subheader and the second sidelink MAC subheader includes a logical channel ID (LCID) field identifying a logical channel, a length field indicating a length of a sidelink MAC SDU, and a format field indicating a size of the length field, and
wherein a first value of the format field indicates 8 bits of the length field, and a second value of the format field indicates 16 bits of the length field.
2. The method of claim 1 ,
wherein the sidelink MAC PDU header further includes a version field indicating a version of the sidelink MAC PDU, and
wherein a bit size of the version field is 4 bits.
3. A method performed by a second terminal in a communication system, the method comprising:
receiving, from a first terminal, a sidelink medium access control (MAC) protocol data unit (PDU); and
identifying a sidelink MAC PDU header, a first sidelink MAC subheader, a first sidelink MAC service data unit (SDU), a second sidelink MAC subheader, and a second sidelink MAC SDU from the sidelink MAC PDU,
wherein the first sidelink MAC SDU is placed in front of the second sidelink MAC subheader and the second sidelink MAC SDU,
wherein each of the first sidelink MAC subheader and the second sidelink MAC subheader includes a logical channel ID (LCID) field identifying a logical channel, a length field indicating a length of a sidelink MAC SDU, and a format field indicating a size of the length field, and
wherein a first value of the format field indicates 8 bits of the length field, and a second value of the format field indicates 16 bits of the length field.
4. The method of claim 3 ,
wherein the sidelink MAC PDU header further includes a version field indicating a version of the sidelink MAC PDU, and
wherein a bit size of the version field is 4 bits.
5. The method of claim 3 , wherein a state variable for a packet data convergence protocol (PDCP) entity is set to a sequence number of a first received PDCP data PDU associated with the sidelink MAC PDU.
6. A first terminal in a communication system, the first terminal comprising:
a transceiver; and
a controller coupled with the transceiver and configured to:
obtain a plurality of sidelink medium access control (MAC) service data units (SDUs),
generate a sidelink MAC protocol data unit (PDU) including a sidelink MAC PDU header, a first sidelink MAC subheader, a first sidelink MAC SDU, a second sidelink MAC subheader, and a second sidelink MAC SDU, wherein the first sidelink MAC SDU is placed in front of the second sidelink MAC subheader and the second sidelink MAC SDU, and
transmit, to a second terminal, the sidelink MAC PDU,
wherein each of the first sidelink MAC subheader and the second sidelink MAC subheader includes a logical channel ID (LCID) field identifying a logical channel, a length field indicating a length of a sidelink MAC SDU, and a format field indicating a size of the length field, and
wherein a first value of the format field indicates 8 bits of the length field, and a second value of the format field indicates 16 bits of the length field.
7. The first terminal of claim 6 ,
wherein the sidelink MAC PDU header further includes a version field indicating a version of the sidelink MAC PDU, and
wherein a bit size of the version field is 4 bits.
8. A second terminal in a communication system, the second terminal comprising:
a transceiver; and
a controller coupled with the transceiver and configured to:
receive, from a first terminal, a sidelink medium access control (MAC) protocol data unit (PDU), and
identify a sidelink MAC PDU header, a first sidelink MAC subheader, a first sidelink MAC service data unit (SDU), a second sidelink MAC subheader, and a second sidelink MAC SDU from the sidelink MAC PDU,
wherein the first sidelink MAC SDU is placed in front of the second sidelink MAC subheader and the second sidelink MAC SDU,
wherein each of the first sidelink MAC subheader and the second sidelink MAC subheader includes a logical channel ID (LCID) field identifying a logical channel, a length field indicating a length of a sidelink MAC SDU, and a format field indicating a size of the length field, and
wherein a first value of the format field indicates 8 bits of the length field, and a second value of the format field indicates 16 bits of the length field.
9. The second terminal of claim 8 ,
wherein the sidelink MAC PDU header further includes a version field indicating a version of the sidelink MAC PDU, and
wherein a bit size of the version field is 4 bits.
10. The second terminal of claim 8 , wherein a state variable for a packet data convergence protocol (PDCP) entity is set to a sequence number of a first received PDCP data PDU associated with the sidelink MAC PDU.