Method and apparatus for performing efficient layer 2 function in mobile communication system
The present disclosure relates to a communication technique for converging IoT technology with a 5G communication system for supporting a higher data transfer rate beyond a 4G system, and a system therefor. The present disclosure can be applied to intelligent services (e.g., smart homes, smart buildings, smart cities, smart or connected cars, health care, digital education, retail business, and services associated with security and safety) on the basis of 5G communication technology and IoT-related technology. Disclosed are a method and an apparatus for configuring an efficient hierarchical layer 2 architecture and main functions thereof in a next-generation mobile communication system.
1. A method for transmitting a signal by a transmitter in a wireless communication system, the method comprising:
generating, by a packet data convergence control (PDCP) entity of the transmitter, a PDCP protocol data unit (PDU);
delivering, by the PDCP entity, the PDCP PDU to a medium access control (MAC) entity of the transmitter;
obtaining, by the MAC entity, a MAC PDU based on a MAC service data unit (SDU) corresponding to the PDCP PDU, the MAC PDU including at least one MAC sub-PDU; and
transmitting the MAC PDU,
wherein each MAC sub-PDU includes a sub-header including a logical channel identifier (LCID) field other than an E field.
2. The method of claim 1 ,
wherein the sub-header corresponds to either the MAC SDU, a MAC control element (CE), or padding, and
wherein the sub-header is placed immediately in front of the corresponding the MAC SDU, the MAC CE, or the padding.
3. The method of claim 1 , wherein the MAC PDU includes information associated with a segment of the PDCP PDU.
4. The method of claim 1 , wherein the PDCP entity is associated with the MAC entity and another MAC entity that belongs to different cell group.
5. A method for receiving a signal by a receiver in a wireless communication system, the method comprising:
receiving, by a medium access control (MAC) entity of the receiver, a MAC protocol data unit (PDU) including at least one MAC sub-PDU, each MAC sub-PDU including a sub-header;
delivering, by the MAC entity, at least one MAC service data unit (SDU) to a PDCP entity of the receiver; and
reordering, by the PDCP entity, at least one PDCP PDU corresponding to the at least one MAC SDU based on a PDCP sequence number,
wherein the sub-header includes a logical channel identifier (LCID) field other than an E field.
6. The method of claim 5 ,
wherein the sub-header corresponds to either the MAC SDU, a MAC control element (CE), or padding, and
wherein the sub-header is placed immediately in front of the corresponding the MAC SDU, the MAC CE, or the padding.
7. The method of claim 5 , wherein the MAC PDU includes information associated with a segment of the PDCP PDU.
8. The method of claim 5 ,
wherein the PDCP entity is associated with the MAC entity and another MAC entity that belongs to different cell group, and
wherein the PDCP entity performs a duplicate detection and a duplicate discarding.
9. A transmitter for transmitting a signal in a wireless communication system, the transmitter comprising:
a transmit unit configured to transmit the signal to a receiver; and
a controller configured to control to:
generate, by a packet data convergence control (PDCP) entity of the transmitter, a PDCP protocol data unit (PDU),
deliver, by the PDCP entity, the PDCP PDU to a medium access control (MAC) entity of the transmitter,
obtain, by the MAC entity, a MAC PDU based on a MAC service data unit (SDU) corresponding to the PDCP PDU, the MAC PDU including at least one MAC sub-PDU, and
transmit the MAC PDU,
wherein each MAC sub-PDU includes a sub-header including a logical channel identifier (LCID) field other than an E field.
10. The transmitter of claim 9 ,
wherein the sub-header corresponds to either the MAC SDU, a MAC control element (CE), or padding, and
wherein the sub-header is placed immediately in front of the corresponding the MAC SDU, the MAC CE, or the padding.
11. The transmitter of claim 9 , wherein the MAC PDU includes information associated with a segment of the PDCP PDU.
12. The transmitter of claim 9 , wherein the PDCP entity is associated with the MAC entity and another MAC entity that belongs to different cell group.
13. A receiver for receiving a signal in a wireless communication system, the receiver comprising:
a receive unit configured to receive a signal from a transmitter; and
a controller configured to control to:
receive, by a medium access control (MAC) entity of the receiver, a MAC protocol data unit (PDU) including at least one MAC sub-PDU, each MAC sub-PDU including a sub-header,
deliver, by the MAC entity, at least one MAC service data unit (SDU) to a PDCP entity of the receiver, and
reorder, by the PDCP entity, at least one PDCP PDU corresponding to the at least one MAC SDU based on a PDCP sequence number,
wherein the sub-header includes a logical channel identifier (LCID) field other than an E field.
14. The receiver of claim 13 ,
wherein the sub-header corresponds to either the MAC SDU, a MAC control element (CE), or padding, and
wherein the sub-header is placed immediately in front of the corresponding the MAC SDU, the MAC CE, or the padding.
15. The receiver of claim 13 ,
wherein the PDCP entity is associated with the MAC entity and another MAC entity that belongs to different cell group, and
wherein the PDCP entity performs a duplicate detection and a duplicate discarding.