TECHNICAL FIELD

This patent document is directed generally to digital wireless communications.

BACKGROUND

Mobile communication technologies are moving the world toward an increasingly connected and networked society. The rapid growth of mobile communications and advances in technology have led to greater demand for capacity and connectivity. Other aspects, such as energy consumption, device cost, spectral efficiency, and latency are also important to meeting the needs of various communication scenarios. Various techniques, including new ways to provide higher quality of service, are being discussed.

SUMMARY OF PARTICULAR EMBODIMENTS

This document discloses methods, systems, and devices related to digital wireless communication, and more specifically, to techniques related to transmitting data and feedback data between network elements.

In one exemplary aspect, a method for wireless communication is disclosed. The method includes receiving, at a transmitting data from a first network element to a second network element; receiving, at the first network element, feedback data from the second network element, where the feedback data includes a highest delivered packet data convergence protocol (PDCP) sequence number (SN) and information indicative of a range of data that has been successfully delivered to a terminal; and retransmitting at least a portion of the data from the first network element based on the feedback data.

In some embodiments, the information indicative of the range of data that has been successfully delivered to the terminal includes a new radio user plane data (NR-U) SN.

In some embodiments, the information indicative of the range of data that has been successfully delivered to the terminal includes the PDCP SN encapsulated within a NR-U packet data unit (PDU) and associated with a NR-U SN, where the NR-U SN is less than or equal to the NR-U SN associated with the PDCP SN.

In some embodiments, the information indicative of the range of data that has been successfully delivered to the terminal includes a PDU NR-U SN list bit map or a PDCP PDU list bit map or one or more start and end of an PDU NR-U SN set or one or more start and end of an PDCP SN set indicating whether the data in the list bitmap or the set belongs to the feedback data to identify multiple PDCPs. In some embodiments, the feedback data is transmitted via a down link data feedback frame.

In some embodiments, the method includes transmitting the data including a NR-U PDU from the first network element to the second network element; and recording the NR-U PDU and a corresponding NR-U PDU SN with a PDCP PDU encapsulated within the NR-PDU SN.

In some embodiments, the method includes transmitting data including a NR-U PDU from the first network element to the second network element; and recording a NR-U PDU and a corresponding NR-U PDU SN with a PDCP encapsulated in the NR-U PDU. In some embodiments, the method includes delivering the data including PDCP from the first network element to the second network element based on the feedback data; and deleting the data corresponding with PDCP from memory of the first network element based on the feedback data.

In some embodiments, the method includes determining the data including PDCP transmitted from the first network element to the second network element was unsuccessfully delivered to the terminal; transmitting PDU data from the first network element to a third network element; and transmitting the PDU data from the third network element to the terminal.

In some embodiments, the first network element is a central unit (CU) of a base station, and the second network element is a dedicated unit (DU) of the base station.

In some embodiments, the CU and DU of the base station are connected via a F1interface.

In some embodiments, the first network element is a first base station and the second network element is a second base station, where the first network element and second network element are connected via a Xn or X2 interface.

In some embodiments, the method includes determining whether all PDCP SN transmitted by the first network element are less than or equal to the highest delivered PDCP SN in the feedback data; and determining whether all NR-U SN transmitted by the first network element are less than or equal to the highest reported NR-U SN in the feedback data, where all transmitted data is successfully delivered to the terminal based on determining that all transmitted PDCP SN are less than or equal to the highest delivered PDCP SN and all transmitted NR-U SN are less than or equal to the highest reported NR-U SN.

In another exemplary aspect, a method for wireless communication is disclosed. The method includes receiving, at a second network element, data from a first network element; transmitting, at the second network element, feedback data to the first network element, where the feedback data includes a highest delivered packet data convergence protocol (PDCP) sequence number (SN) and information indicative of a range of data that has been successfully delivered to a terminal; and receiving at least a portion of data retransmitted from the first network element based on the feedback data.

In some embodiments, the information indicative of the range of data that has been successfully delivered to the terminal includes at least one new radio user plane data (NR-U) SN.

In some embodiments, the information indicative of the range of data that has been successfully delivered to the terminal includes the PDCP SN encapsulated within a NR-U packet data unit (PDU) associated with the NR-U SN, where the SN indicates that the NR-U SN is less than or equal to the NR-U SN associated with the PDCP SN.

In some embodiments, the information indicative of the range of data that has been successfully delivered to the terminal indicates a PDU NR-U SN list bit map or a PDCP PDU list bit map or one or more start and end of an PDU NR-U SN set or one or more start and end of an PDCP SN set indicating whether the data in the list bitmap or set belongs to the feedback data to identify multiple PDCPs.

In some embodiments, the feedback data is transmitted via a down link data feedback frame.

In some embodiments, the method including receiving NR-U PDU at the first network element from the second network element; and recording a NR-PDU and a corresponding NR-U PDU SN with a PDCP PDU encapsulated within the NR-PDU SN.

In some embodiments, the method including receiving NR-U PDU at the first network element from the second network element; and recording a NR-U PDU and a corresponding NR-U PDU SN with the PDCP encapsulated in the NR-U PDU.

In some embodiments, the method includes determining whether NR-U PDU transmitted from the first network element to the second network element is retransmission data; and transmitting the retransmission data from the second network element to the terminal based on determining that the NR-U PDU transmitted from the first network element to the second network element is retransmission data.

In some embodiments, the method includes receiving data at the second network element from the first network element, where the data includes at least two NR-U PDUs, and where each of the at least two NR-U PDUs include PDCP SN encapsulated in the NR-U PDU; reordering the NR-U PDUs based on PDCP SN sequence at the second network element; and transmitting the ordered NR-U PDUs to the terminal.

In some embodiments, the method includes determining whether all PDCP SN transmitted by the first network element are less than or equal to the highest delivered PDCP SN in the feedback data; and determining whether all NR-U SN transmitted by the first network element are less than or equal to the highest reported NR-U SN in the feedback data, where all transmitted data is successfully delivered to the terminal based on determining that all transmitted PDCP SN are less than or equal to the highest delivered PDCP SN and all transmitted NR-U SN are less than or equal to the highest reported NR-U SN.

In some embodiments, the method includes receiving data including PDCP from the first network element to the second network element based on the feedback data; and deleting the data corresponding with PDCP that is locally stored at the first network element based on the feedback data. In some embodiments, the method includes determining that the PDCP transmitted from the first network element to the second network element was unsuccessfully delivered to the terminal; transmitting the PDU data from a first network element to a third network element; and transmitting the PDU data from the third network element to the terminal.

In some embodiments, the first network element is a central unit (CU) of a base station, and the second network element is a dedicated unit (DU) of the base station.

In some embodiments, the CU and DU of the base station are connected via an F1interface.

In some embodiments, the first network element is a first base station and the second network element is a second base station, where the first network element and second network element are connected via a Xn or X2 interface.

In some embodiments, including a second terminal connected to the first network element and a network element connected to a plurality of base stations.

In another exemplary aspect, a wireless communications apparatus comprising a processor is disclosed. The processor is configured to implement a method described herein.

In yet another exemplary aspect, the various techniques described herein may be embodied as processor-executable code and stored on a computer-readable program medium.

The details of one or more implementations are set forth in the accompanying attachments, the drawings, and the description below. Other features will be apparent from the description and drawings, and from the claims.

