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US-20260128974-A1 - DELAY STATUS REPORTS IN WIRELESS COMMUNICATIONS

US20260128974A1US 20260128974 A1US20260128974 A1US 20260128974A1US-20260128974-A1

Abstract

A transmitter node of a telecommunications system comprises processor circuitry and interface circuitry. The processor circuitry is configured to generate a delay status report (DSR) medium access control (MAC) control element (CE). The DSR MAC CE comprises an indication for which of plural zones of a logical channel group the DSR MAC CE comprises a set of information fields. The interface circuitry is configured to transmit the DSR MAC CE over a radio interface to a receiver node of the telecommunications system.

Inventors

  • Sangkyu BAEK
  • Zhanping Yin

Assignees

  • SHARP KABUSHIKI KAISHA

Dates

Publication Date
20260507
Application Date
20241107

Claims (15)

  1. 1 . A transmitter node of a telecommunications system, the transmitter node comprising: processor circuitry configured to generate a delay status report (DSR) medium access control (MAC) control element (CE), the DSR MAC CE comprises an indication for which of plural zones of a logical channel group the DSR MAC CE comprises a set of information fields; and interface circuitry configured to transmit the DSR MAC CE over a radio interface to a receiver node of the telecommunications system.
  2. 2 . The node of claim 1 , further comprising memory, the memory comprising a buffer wherein packets for the logical channel group are stored, and wherein each of the packets for the logical channel group are classified in one of the plural zones, and wherein the zones are differentiated based on a remaining time for a packet in the buffer for the logical channel group before discarding the packet from the buffer.
  3. 3 . The node of claim 1 , wherein for a same logical channel group, sets of information for the plural zones are arranged in a predetermined order of reporting in accordance with a threshold of each zone.
  4. 4 . The node of claim 1 , wherein the processor circuitry is configured to generate the DSR MAC CE to comprise: a first set of information fields for a first zone of a logical channel group reported by the DSR MAC CE; and an indication whether the DSR MAC CE includes a set of information fields for another zone of the logical channel group.
  5. 5 . The node of claim 4 , wherein the first set of information fields comprises the indication whether the DSR MAC CE includes the set of information fields for another zone of the logical channel group.
  6. 6 . The node of claim 1 , the processor circuitry is further configured to generate the DSR MAC CE to comprise a bitmap corresponding to the plural zones, and wherein the DSR MAC CE includes the set of information fields for zones of the logical channel group according to the bitmap.
  7. 7 . The node of claim 1 , wherein the set of information fields comprises a remaining time field and a buffer size field.
  8. 8 . The node of claim 1 , wherein the node is a wireless terminal which communicates over a radio interface with a network node.
  9. 9 . The node of claim 1 , wherein the DSR MAC CE further comprises a bitmap which indicates one or more logical channel groups (LCGs) comprising delay critical data.
  10. 10 . The node of claim 2 , wherein, within the DSR MAC CE, the sets of information fields for the one or more logical groups are arranged in a predetermined order based on an identifier of the respective logical channel groups (LCGs).
  11. 11 . A transmitter node of a telecommunications system, the transmitter node comprising: processor circuitry configured to generate a delay status report (DSR) medium access control (MAC) control element (CE), the DSR MAC CE comprising: a set of information fields for at least one zone of the logical channel group; and an indication of whether the set of information fields comprises a buffer size field for delay-critical data and a separate buffer size field for non-delay-critical data; interface circuitry configured to transmit the DSR MAC CE over a radio interface to a receiver node of the telecommunications system.
  12. 12 . The node of claim 11 , wherein the indication comprises an R field of the set of information fields for the DSR MAC CE.
  13. 13 . The node of claim 11 , wherein the indication comprises a one-bit field of the set of information fields for the DSR MAC CE.
  14. 14 . The node of claim 11 , wherein a size of at least one of the buffer size field for delay-critical data and a size of the separate buffer size field for the non-delay-critical data is configured according to a message received from the network node.
  15. 15 . A method in a transmitter node of a telecommunications system, the method comprising: generating a delay status report (DSR) medium access control (MAC) control element (CE), the DSR MAC CE comprises an indication for which of plural zones of a logical channel group the DSR MAC CE comprises a set of information fields; and transmitting the DSR MAC CE over a radio interface to a receiver node of the telecommunications system.

Description

TECHNICAL FIELD The technology relates to wireless communications, and particularly to the reporting between network nodes, e.g., between a transmitter node and a receiver node, the presence of delay-critical data awaiting transmission. BACKGROUND A radio access network typically resides between wireless devices, such as user equipment (UEs), mobile phones, mobile stations, or any other device having wireless termination, and a core network. Example of radio access network types includes the GRAN, GSM radio access network; the GERAN, which includes EDGE packet radio services; UTRAN, the UMTS radio access network; E-UTRAN, which includes Long-Term Evolution; and NG-UTRAN, the New Radio (NR). A radio access network may comprise one or more access nodes, such as base station nodes, which facilitate wireless communication or otherwise provides an interface between a wireless terminal and a telecommunications system. A non-limiting example of a base station can include, depending on radio access technology type, a Node B (“NB”), an enhanced Node B (“eNB”), a home eNB (“HeNB”), a gNB (for a New Radio [“NR”] technology system), or some other similar terminology. The 3rd Generation Partnership Project (“3GPP”) is a group that, e.g., develops collaboration agreements such as 3GPP standards that aim to define globally applicable technical specifications and technical reports for wireless communication systems. Various 3GPP documents may describe certain aspects of radio access networks. Overall architecture for a fifth-generation system, e.g., the 5G System, also called “NR” or “New Radio”, as well as “NG” or “Next Generation”, is shown in FIG. 1, and is also described in 3GPP TS 38.300. The 5G NR network is comprised of NG RAN (Next Generation Radio Access Network) and 5GC (5G Core Network). As shown, NGRAN is comprised of gNBs (e.g., 5G Base stations) and ng-eNBs (i.e. LTE base stations). An Xn interface exists between gNB-gNB, between (gNB)-(ng-eNB) and between (ng-eNB)-(ng-eNB). The Xn is the network interface between NGRAN nodes. Xn-U stands for Xn User Plane interface and Xn-C stands for Xn Control Plane interface. An interface known as the NG interface exists between 5GC and the base stations (i.e. gNB & ng-eNB). A gNB node provides NR user plane and control plane protocol terminations towards the UE and is connected via the NG interface to the 5GC. The 5G NR (New Radio) gNB is connected to AMF (Access and Mobility Management Function) and UPF (User Plane Function) in 5GC (5G Core Network). The Open Systems Interconnection, OSI, model is a reference framework that explains the process of transmitting data between computers. It is divided into seven layers that work together to carry out specialized network functions, allowing for a more systematic approach to networking. Information transferred from one device to another device travels through 7 layers of OSI model. First data travels down through 7 layers from the sender's end and then climbs back 7 layers on the receiver's end. Data flows through the OSI model in a step-by-step process: Layer 7: Application Layer: Applications create the data.Layer 6: Presentation Layer: Data is formatted and encrypted.Layer 5: Session Layer: Connections are established and managed.Layer 4: Transport Layer: Data is broken into segments for reliable delivery.Layer 3: Network Layer: Segments are packaged into packets and routed.Layer 2: Data Link Layer: Packets are framed and sent to the next device.Layer 1: Physical Layer: Frames are converted into bits and transmitted physically. A protocol stack may comprise different individual protocols. Protocols may be simply described as a set of rules that allow communication between peer entities or they can also be described as set of rules that facilitate horizontal communication. These protocols may be arranged in the layers such as those described above. In a transmitter side, a layer N receives data from layer N+1 and this data is called the SDU or Service Data Unit. This layer will modify the data and convert it into a PDU or a Protocol Data Unit. The peer entity in the receiver is only able to understand this PDU. In the receiver side, the peer entity receives the PDU from layer N−1, e.g., actually layer N−1 SDU, and converts it back into SDU(s) and passes it to layer N+1. Radio Link Control (RLC) is a layer 2 Radio Link Protocol used in UMTS, LTE and 5G on the Air interface. This protocol is specified by 3GPP in TS 25.322 for UMTS, TS 36.322 for LTE and TS 38.322 for 5G New Radio (NR). RLC is located on top of the 3GPP MAC-layer and below the PDCP-layer. The main tasks of the RLC protocol are: Transfer of upper layer Protocol Data Units (PDUs) in one of three modes: Acknowledged Mode (AM), Unacknowledged Mode (UM) and Transparent Mode (TM)Error correction through ARQ (only for AM data transfer)Segmentation and reassembly of RLC SDUs (UM and AM)Re-segmentation of RLC data PDUs (AM)Reordering of RLC data PDUs (UM and AM)Duplica