Method and apparatus of transmitting RLC status report in next generation mobile communication system
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services.
1. A method of transmitting a radio link control (RLC) status report by a receiving apparatus in a wireless communication system, the method comprising:
receiving an RLC protocol data unit (PDU) from a transmitting apparatus;
generating a status PDU based on the RLC PDU; and
transmitting the status PDU to the transmitting apparatus,
wherein the status PDU includes a first field indicating whether a second field and a third field follow, the second field indicating a sequence number (SN) of a RLC data unit identified as lost, the third field indicating whether a fourth field follows for the second field, and the fourth field including a number of consecutively lost RLC data units starting from and including the SN,
wherein a first reserved field is placed immediately after the first field and an octet including the first field is byte aligned based on the first reserved field, and
wherein a second reserved field is placed immediately after the third field and an octet including the third field is byte aligned based on the second reserved field.
2. The method of claim 1 , wherein the first field includes an extension bit 1 (E1) field, the second field includes a negative acknowledgement sequence number (NACK_SN) field, the third field includes an extension bit 3 (E3) field, and the fourth field includes a NACK_range field.
3. The method of claim 2 , wherein, in case that the E3 field indicates that the NACK_range field follows the NACK_SN field, the status PDU further includes:
a segment offset (SO) start field indicating a position of a first byte of a portion of the RLC data unit with the SN indicated by the NACK_SN field within an original RLC data unit; and
an SO end field indicating a position of a last byte of a portion of a RLC data unit with a SN associated with the NACK_range field within an original RLC data unit.
4. The method of claim 3 , wherein the SN associated with the NACK_range field and indicated by the SO end field is determined by the following equation, the SN associated with the SO end field=the SN indicated by the NACK_SN field+the number of consecutively lost RLC data units indicated by the NACK_range field−1.
5. The method of claim 4 , wherein the status PDU further includes an extension bit 2 (E2) field, and
wherein the E2 field indicates whether the SO start field and the SO end field follow for the NACK_SN field.
6. A method of receiving a radio link control (RLC) status report by a transmitting apparatus in a wireless communication system, the method comprising:
transmitting an RLC protocol data unit (PDU) to a receiving apparatus;
receiving a status PDU generated based on the RLC PDU from the receiving apparatus; and
identifying, from the status PDU, a first field indicating whether a second field and a third field follow, the second field indicating a sequence number (SN) of a RLC data unit identified as lost, the third field indicating whether a fourth field follows for the second field, and the fourth field including a number of consecutively lost RLC data units starting from and including the SN,
wherein a first reserved field is placed immediately after the first field and an octet including the first field is byte aligned based on the first reserved field, and
wherein a second reserved field is placed immediately after the third field and an octet including the third field is byte aligned based on the second reserved field.
7. The method of claim 6 , wherein the first field includes an extension bit 1 (E1) field, the second field includes a negative acknowledgement sequence number (NACK_SN) field, the third field includes an extension bit 3 (E3) field, and the fourth field includes a NACK_range field.
8. The method of claim 7 , wherein, in case that the E3 field indicates that NACK_range field follows the NACK_SN field, the status PDU further includes:
a segment offset (SO) start field indicating a position of a first byte of a portion of the RLC data unit with the SN indicated by the NACK_SN field within an original RLC data unit; and
an SO end field indicating a position of a last byte of a portion of a RLC data unit with a SN associated with the NACK_range field within an original RLC data unit.
9. The method of claim 8 , wherein the SN associated with the NACK_range field and indicated by the SO end field is determined by the following equation, the SN associated with the SO end field=the SN indicated by the NACK_SN field+the number of consecutively lost RLC data units indicated by the NACK_range field−1.
10. The method of claim 9 , wherein the status PDU further includes an extension bit 2 (E2) field, and
wherein the E2 field indicates whether the SO start field and the SO end field follow for the NACK_SN field.
11. A receiving apparatus of transmitting a radio link control (RLC) status report in a wireless communication system, the receiving apparatus comprising:
a transceiver; and
a controller configured to:
receive an RLC protocol data unit (PDU) from a transmitting apparatus via the transceiver,
generate a status PDU based on the RLC PDU, and
transmit the status PDU to the transmitting apparatus via the transceiver,
wherein the status PDU includes a first field indicating whether a second field and a third field follow, the second field indicating a sequence number (SN) of a RLC data unit identified as lost, the third field indicating whether a fourth field follows for the second field, and the fourth field including a number of consecutively lost RLC data units starting from and including the SN,
wherein a first reserved field is placed immediately after the first field and an octet including the first field is byte aligned based on the first reserved field, and
wherein a second reserved field is placed immediately after the third field and an octet including the third field is byte aligned based on the second reserved field.
12. The receiving apparatus of claim 11 , wherein the first field includes an extension bit 1 (E1) field, the second field includes a negative acknowledgement sequence number (NACK_SN) field, the third field includes an extension bit 3 (E3) field, and the fourth field includes a NACK_range field.
13. The receiving apparatus of claim 12 , wherein, in case that the E3 field indicates that the NACK_range field follows the NACK_SN field, the status PDU further includes:
a segment offset (SO) start field indicating a position of a first byte of a portion of the RLC data unit with the SN indicated by the NACK_SN field within an original RLC data unit; and
an SO end field indicating a position of a last byte of a portion of a RLC data unit with a SN associated with the NACK_range field within an original RLC data unit.
14. The receiving apparatus of claim 13 , wherein the SN associated with the NACK_range field and indicated by the SO end field is determined by the following equation, the SN associated with the SO end field=the SN indicated by the NACK_SN field+the number of consecutively lost RLC data units indicated by the NACK_range field−1.
15. The receiving apparatus of claim 14 , wherein the status PDU further includes an extension bit 2 (E2) field, and
wherein the E2 field indicates whether the SO start field and the SO end field follow for the NACK_SN field.
16. A transmitting apparatus of receiving a radio link control (RLC) status report in a wireless communication system, the transmitting apparatus comprising:
a transceiver; and
a controller configured to:
transmit an RLC protocol data unit (PDU) to a receiving apparatus via the transceiver,
receive a status PDU generated based on the RLC PDU from the receiving apparatus via the transceiver, and
identify, from the status PDU, a first field indicating whether a second field and a third field follow, the second field indicating a sequence number (SN) of a RLC data unit identified as lost, the third field indicating whether a fourth field follows for the second field, and the fourth field including a number of consecutively lost RLC data units starting from and including the SN,
wherein a first reserved field is placed immediately after the first field and an octet including the first field is byte aligned based on the first reserved field, and
wherein a second reserved field is placed immediately after the third field and an octet including the third field is byte aligned based on the second reserved field.
17. The transmitting apparatus of claim 16 , wherein the first field includes an extension bit 1 (E1) field, the second field includes a negative acknowledgement sequence number (NACK_SN) field, the third field includes an extension bit 3 (E3) field, and the fourth field includes a NACK_range field.
18. The transmitting apparatus of claim 17 , wherein, in case that the E3 field indicates that NACK_range field follows the NACK_SN field, the status PDU further includes:
a segment offset (SO) start field indicating a position of a first byte of a portion of the RLC data unit with the SN indicated by the NACK_SN field within an original RLC data unit; and
an SO end field indicating a position of a last byte of a portion of a RLC data unit with a SN associated with the NACK_range field within an original RLC data unit.
19. The transmitting apparatus of claim 18 , wherein the SN associated with the NACK_range field and indicated by the SO end field is determined by the following equation, the SN associated with the SO end field=the SN indicated by the NACK_SN field+the number of consecutively lost RLC data units indicated by the NACK_range field−1.
20. The transmitting apparatus of claim 19 , wherein the status PDU further includes an extension bit 2 (E2) field, and
wherein the E2 field indicates whether the SO start field and the SO end field follow for the NACK_SN field.