Search

US-20260128973-A1 - DELAY STATUS REPORTS IN WIRELESS COMMUNICATIONS

US20260128973A1US 20260128973 A1US20260128973 A1US 20260128973A1US-20260128973-A1

Abstract

A transmitter node of a telecommunications system comprises processor circuitry and interface circuitry. The processor circuitry is configured to generate a truncated delay status report (DSR) medium access control (MAC) control element (CE). The truncated DSR MAC CE is configured to comprise only a subset of contents of a full DSR MAC CE. The interface circuitry is configured to transmit the truncated 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 truncated delay status report (DSR) medium access control (MAC) control element (CE), the truncated DSR MAC CE comprising only a subset of contents of a full DSR MAC CE; interface circuitry configured to transmit the truncated DSR MAC CE over a radio interface to a receiver node of the telecommunications system.
  2. 2 . The node of claim 1 , wherein the processor circuitry is configured to generate the truncated DSR MAC CE upon receipt of an uplink grant having an uplink grant size that is smaller than size of the full DSR MAC CE.
  3. 3 . The node of claim 1 , wherein the processor circuitry is configured to generate the truncated DSR MAC CE to comprise a bitmap which indicates one or more logical channel groups (LCGs) comprising delay critical data.
  4. 4 . The node of claim 1 , wherein the processor circuitry is configured to generate the truncated DSR MAC CE to comprise a set of information fields, for selected one(s) of the one or more logical channel groups, the set of information fields comprising a remaining time field and a buffer size field.
  5. 5 . The node of claim 4 , wherein the processor circuitry is configured to select the selected one(s) of the one or more logical groups based on size of an uplink grant which is smaller than the size of the full DSR MAC CE.
  6. 6 . The node of claim 4 , wherein the processor circuitry is configured to arrange, within the truncated DSR MAC CE, the sets of information fields for the selected one(s) of the one or more logical groups in a predetermined order based on an identifier of the respective logical channel groups (LCGs).
  7. 7 . The node of claim 6 , further comprising memory, the memory comprising a buffer wherein packets for a selected logical channel group are stored, and wherein each of the packets for the selected logical channel group are classified in one of plural zones, the zones being differentiated based on a remaining time for the packet in the buffer before discard of the packet from the buffer, and wherein the processor circuitry is configured to generate the truncated DSR MAC CE to include the sets of information fields for a subset of the plural zones for the selected logical channel group; and include in the truncated DSR MAC CE an indication that delay critical data resides in other zones of the selected logical channel group for which information fields are not included in the truncated DSR MAC CE.
  8. 8 . The node of claim 6 , further comprising memory, the memory comprising a buffer wherein packets for a logical channel group are stored, and wherein each of the packets for the logical channel group are classified in one of plural zones, the zones being differentiated based on a remaining time for the packet in the buffer before discard of the packet from the buffer, and wherein the processor circuitry is configured to generate the truncated DSR MAC CE to include the sets of information fields for the plural zones for the logical channel groups in a predetermined order.
  9. 9 . The node of claim 1 , wherein the node is a wireless terminal which communicates over a radio interface with a network node.
  10. 10 . A method in a node of a telecommunications system, the method comprising: generating a truncated delay status report (DSR) medium access control (MAC) control element (CE), the truncated DSR MAC CE comprising only a subset of contents of a full DSR MAC CE; transmitting the truncated DSR MAC CE over a radio interface to a receiver node of the telecommunications system.
  11. 11 . A receiver node of a telecommunications system, the receiver node comprising: interface circuitry configured to receive a truncated delay status report (DSR) medium access control (MAC) control element (CE) over a radio interface from a transmitter node of the telecommunications system processor circuitry configured to determine from the truncated DSR MAC CE that the truncated DSR MAC CE comprises only a subset of contents of a full DSR MAC CE.
  12. 12 . The node of claim 11 , wherein the truncated DSR MAC CE does not encompass one or more of the following: at least one logical channel groups having delay critical data; at least one zone of plural zones of a selected logical channel group, the zones being differentiated based on a remaining time for a packet in a buffer for the selected logical channel group before discarding the packet from the buffer.
  13. 13 . The node of claim 11 , wherein the truncated DSR MAC CE comprises: a bitmap which indicates one or more logical channel groups (LCGs) comprising delay critical data; a set of information fields, for selected one(s) of the one or more logical channel groups, the set of information fields comprising a remaining time field and a buffer size field.
  14. 14 . The node of claim 13 , wherein, within the truncated DSR MAC CE, the sets of information fields for the selected one(s) of the one or more logical groups are arranged in a predetermined order based on an identifier of the respective logical channel groups (LCGs).
  15. 15 . The node of claim 11 , wherein the processor circuitry is configured to determine from the truncated DSR MAC CE an indication that delay critical data resides in one or more of the following: at least one logical channel groups not reported by the truncated DSR MAC CE; at least one zone of plural zones not reported by the truncated DSR MAC CE for a selected logical channel group, the zones being differentiated based on a remaining time for a packet in a buffer for the selected logical channel group before discarding the packet from the buffer.

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 NG-RAN 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)Duplic