Apparatus, system and method for efficient packet retransmission in a disaggregated GNB architecture

1. An apparatus of a radio access node (RAN node), the apparatus comprising:

a Radio Frequency (RF) circuitry interface to send and receive messages to and from a RF circuitry; and

one or more processors coupled to the RF circuitry interface, the one or more processors to:

generate a message including a downlink (DL) delivery data status (DDDS) frame including flags to indicate a presence of all associated optional information elements therein, the DDDS frame including information elements corresponding to an out-of-sequence delivery report for DL packet data convergence protocol (PDCP) protocol data units (PDUs) (PDCP PDUs) successfully delivered from the RAN node to a user equipment (UE); and

cause transmission of the DDDS frame to a receiving node corresponding to the RAN node in a New Radio (NR) network, the receiving node hosting a NR packet data convergence protocol (PDCP) (NR PDCP) entity.

2. The apparatus of claim 1 , wherein the information elements corresponding to the out-of-sequence delivery report include information element to indicate a presence of additional information elements corresponding to the out-of-sequence delivery report.

3. The apparatus of claim 2 , wherein the information element to indicate a presence has a length of one bit.

4. The apparatus of claim 2 , wherein the additional information elements include a start information element to indicate a Start of Out-of-sequence Number range corresponding to a start of a PDCP PDU sequence number range reported to be successfully delivered, and an end information element to indicate an End of Out-of-sequence Number range corresponding to an end of a PDCP PDU sequence number range reported to be successfully delivered.

5. The apparatus of claim 4 , wherein the information element to indicate a presence has a length of one bit, and is set to 1 to indicate a presence of an information element indicating Number of out-of-sequence number ranges reported, and to be set to zero to indicate an absence of the start information element and of the end information element.

6. The apparatus of claim 5 , wherein the information element indicating Number of out-of-sequence number ranges reported has a Value range of {1 . . . 255} and a field length of one octet.

7. The apparatus of claim 4 , wherein the start information element and the end information element each have a Value range of {0 . . . 2 18 −1}.

8. The apparatus of claim 1 , further including a radio front end module coupled to the one or more processors.

9. The apparatus of claim 8 , further including one or more antennas coupled to the one or more processors, the antennas to transmit the DDDS frame.

10. A method to be performed at an apparatus of a radio access node (RAN node) in a New Radio (NR) network, the method comprising:

generating a message including a downlink (DL) delivery data status (DDDS) frame including flags to indicate a presence of all associated optional information elements therein, the DDDS frame including information elements corresponding to an out-of-sequence delivery report for DL packet data convergence protocol (PDCP) protocol data units (PDUs) (PDCP PDUs) successfully delivered from the RAN node to a user equipment (UE); and

causing transmission of the DDDS frame to a receiving node corresponding to the RAN node in a New Radio (NR) network, the receiving node hosting a NR packet data convergence protocol (PDCP) (NR PDCP) entity.

11. The method of claim 10 , wherein the information elements corresponding to the out-of-sequence delivery report include information element to indicate a presence of additional information elements corresponding to the out-of-sequence delivery report.

12. The method of claim 11 , wherein the information element to indicate a presence has a length of one bit.

13. The method of claim 11 , wherein the additional information elements include a start information element to indicate a Start of Out-of-sequence Number range corresponding to a start of a PDCP PDU sequence number range reported to be successfully delivered, and an end information element to indicate an End of Out-of-sequence Number range corresponding to an end of a PDCP PDU sequence number range reported to be successfully delivered.

14. The method of claim 13 , wherein the information element to indicate a presence has a length of one bit, and is set to 1 to indicate a presence of an information element indicating Number of out-of-sequence number ranges reported, and to be set to zero to indicate an absence of the start information element and of the end information element.

15. The method of claim 14 , wherein the information element indicating Number of out-of-sequence number ranges reported has a Value range of {1 . . . 255} and a field length of one octet.

16. One or more non-transitory computer-readable media comprising instructions to cause an apparatus of a receiving node of a New Radio (NR) network hosting a NR packet data convergence protocol (PDCP) (NR PDCP) entity, upon execution of the instructions by one or more processors of the apparatus, to perform operations including:

processing a message from a sending node of the NR network including a downlink (DL) delivery data status (DDDS) frame including flags to indicate a presence of all associated optional information elements therein, the DDDS frame including information elements corresponding to an out-of-sequence delivery report for DL packet data convergence protocol (PDCP) protocol data units (PDUs) (PDCP PDUs) successfully delivered from the RAN node to a user equipment (UE); and

controlling a flow of PDCP PDUs to the sending node based on the out-of-sequence delivery report.

17. The one or more non-transitory computer-readable media of claim 16 , wherein the information elements corresponding to the out-of-sequence delivery report include information element to indicate a presence of additional information elements corresponding to the out-of-sequence delivery report.

18. The one or more non-transitory computer-readable media of claim 17 , wherein the information element to indicate a presence has a length of one bit.

19. The one or more non-transitory computer-readable media of claim 17 , wherein the additional information elements include a start information element to indicate a Start of Out-of-sequence Number range corresponding to a start of a PDCP PDU sequence number range reported to be successfully delivered, and an end information element to indicate an End of Out-of-sequence Number range corresponding to an end of a PDCP PDU sequence number range reported to be successfully delivered.

20. The one or more non-transitory computer-readable media of claim 19 , wherein the information element to indicate a presence has a length of one bit, and is set to 1 to indicate a presence of an information element indicating Number of out-of-sequence number ranges reported, and to be set to zero to indicate an absence of the start information element and of the end information element.

21. The one or more non-transitory computer-readable media of claim 20 , wherein the information element indicating Number of out-of-sequence number ranges reported has a Value range of {1 . . . 255} and a field length of one octet.

22. The one or more non-transitory computer-readable media of claim 20 , wherein the start information element and the end information element each have a Value range of {0 . . . 2 18 −1}.

23. An apparatus of a radio access node (RAN node) in a New Radio (NR) network, the apparatus comprising:

means for generating a message including a downlink (DL) delivery data status (DDDS) frame including flags to indicate a presence of all associated optional information elements therein, the DDDS frame including information elements corresponding to an out-of-sequence delivery report for DL packet data convergence protocol (PDCP) protocol data units (PDUs) (PDCP PDUs) successfully delivered from the RAN node to a user equipment (UE); and

means for causing transmission of the DDDS frame to a receiving node corresponding to the RAN node in a New Radio (NR) network, the receiving node hosting a NR packet data convergence protocol (PDCP) (NR PDCP) entity.

24. The apparatus of claim 23 , wherein the information elements corresponding to the out-of-sequence delivery report include an information element to indicate a presence of additional information elements corresponding to the out-of-sequence delivery report, the additional information elements including a start information element to indicate a Start of Out-of-sequence Number range corresponding to a start of a PDCP PDU sequence number range reported to be successfully delivered, and an end information element to indicate an End of Out-of-sequence Number range corresponding to an end of a PDCP PDU sequence number range reported to be successfully delivered.

25. The apparatus of claim 24 , wherein the information element to indicate a presence has a length of one bit, and is set to 1 to indicate a presence of an information element indicating Number of out-of-sequence number ranges reported, and to be set to zero to indicate an absence of the start information element and of the end information element.