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WO2025053687A1 - Procédés et appareil de gestion d'un rapport sur l'état de retard pour une réalité étendue - Google Patents

Procédés et appareil de gestion d'un rapport sur l'état de retard pour une réalité étendue Download PDF

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Publication number
WO2025053687A1
WO2025053687A1 PCT/KR2024/013532 KR2024013532W WO2025053687A1 WO 2025053687 A1 WO2025053687 A1 WO 2025053687A1 KR 2024013532 W KR2024013532 W KR 2024013532W WO 2025053687 A1 WO2025053687 A1 WO 2025053687A1
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Prior art keywords
mac
dsr
delay
pdu
remaining time
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English (en)
Inventor
Vinay Kumar Shrivastava
Aby Kanneath ABRAHAM
Sriganesh RAJENDRAN
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/28—Flow control; Congestion control in relation to timing considerations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/32—Flow control; Congestion control by discarding or delaying data units, e.g. packets or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/131—Protocols for games, networked simulations or virtual reality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0278—Traffic management, e.g. flow control or congestion control using buffer status reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols

Definitions

  • IIoT Industrial Internet of Things
  • IAB Integrated Access and Backhaul
  • DAPS Dual Active Protocol Stack
  • 5G baseline architecture for example, service based architecture or service based interface
  • NFV Network Functions Virtualization
  • SDN Software-Defined Networking
  • MEC Mobile Edge Computing
  • Another object of embodiments herein is to disclose methods and systems for configuring UE for buffered data delay reporting for the extended reality in the wireless networks.
  • Another object of the embodiments herein is to disclose methods and systems for scheduling by the network for a buffered data for the UE based on the corresponding delay information reported.
  • Another object of the embodiments herein is to disclose methods and systems for Delay Status Reporting (DSR) for extended reality.
  • DSR Delay Status Reporting
  • Another object of the embodiments herein is to disclose methods and systems for managing Medium Access Control (MAC) operations in a New Radio (NR).
  • MAC Medium Access Control
  • NR New Radio
  • Another object of the embodiments herein is to disclose methods and systems for DSR handling during a MAC Reset, DSR handling during a Service Data Unit (SDU)/PDU Set discard, and Side-Link Paging Reference signal (SL-PRS) resource request handling during a MAC Reset.
  • SDU Service Data Unit
  • S-PRS Side-Link Paging Reference signal
  • Another object of the embodiments herein is to disclose methods and systems for cancelling a triggered DSR procedure upon resetting the MAC.
  • Another object of the embodiments herein is to disclose methods and systems for cancelling a triggered SL-PRS resource request upon MAC Reset, i.e., the UE MAC may cancel the triggered SL-PRS resource request upon the MAC reset.
  • an aspect of the disclosure is to provide a method and apparatus for managing delay status reporting for extended reality.
  • the embodiments herein provide a method for reporting a delay status by a User Equipment (UE).
  • the method comprises configuring at least one remaining time threshold of at least one of a packet, a Packet Data Unit (PDU), a PDU Set, and a Service Data Unit (SDU).
  • the remaining time threshold is received from a network.
  • the method comprises determining a remaining time of at least one of the packet, the PDU, the PDU Set, and the SDU.
  • the method comprises triggering, by a Medium Access Control (MAC) entity of the UE, a Delay Status Report (DSR) MAC Control Element (CE) for a delay status reporting, on determining the remaining time of at least one of the packet, the PDU, the PDU Set, and the SDU is less than the configured remaining time threshold.
  • MAC Medium Access Control
  • DSR Delay Status Report
  • CE MAC Control Element
  • the embodiments herein provide a UE comprising a processor, and a memory module.
  • the processor is coupled with the memory module.
  • the processor is configured to configure at least one remaining time threshold of at least one of a PDU, a PDU Set, and a SDU.
  • the remaining time threshold is received from a network.
  • the processor is configured to determine a remaining time of at least one of the packet, the PDU, the PDU Set, and the SDU.
  • the processor is configured to trigger a DSR MAC CE for a delay status reporting by a MAC entity, on determining the remaining time of at least one of the packet, the PDU, the PDU Set, and the SDU is less than the configured remaining time threshold.
  • FIG. 7 depicts an Extended Reality (XR) Buffer Status Report (BSR) MAC Control Element (CE) format to carry BSR contents for XR services, according to embodiments as disclosed herein;
  • XR Extended Reality
  • BSR Buffer Status Report
  • CE MAC Control Element
  • FIG. 8 depicts an enhanced BSR MAC CE format to carry BSR contents for XR and non-XR services, according to embodiments as disclosed herein;
  • FIG. 11 depicts a sample structure of Short Delay reporting BSR MAC CE carrying 5-bit delay information of PDU set/PDU, according to embodiments as disclosed herein;
  • FIG. 12 depicts a sample structure of Short Delay reporting BSR MAC CE carrying 3-bit delay information of PDU set/PDU, according to embodiments as disclosed herein;
  • FIG. 14 depicts a sample structure of enhanced common BSR MAC CE carrying delay information or buffer status, according to embodiments as disclosed herein;
  • FIG. 15 depicts a sample structure of DSR MAC CE, according to embodiments as disclosed herein;
  • Embodiments herein may be described and illustrated in terms of blocks which carry out a described function or functions. These blocks, which may be referred to herein as managers, units, modules, hardware components or the like, are physically implemented by analog and/or digital circuits such as logic gates, integrated circuits, microprocessors, microcontrollers, memory circuits, passive electronic components, active electronic components, optical components, hardwired circuits and the like, and may optionally be driven by a firmware.
  • the circuits may, for example, be embodied in one or more semiconductor chips, or on substrate supports such as printed circuit boards and the like.
  • circuits constituting a block may be implemented by dedicated hardware, or by a processor (e.g., one or more programmed microprocessors and associated circuitry), or by a combination of dedicated hardware to perform some functions of the block and a processor to perform other functions of the block.
  • a processor e.g., one or more programmed microprocessors and associated circuitry
  • Each block of the embodiments may be physically separated into two or more interacting and discrete blocks without departing from the scope of the disclosure.
  • the blocks of the embodiments may be physically combined into more complex blocks without departing from the scope of the disclosure.
  • Extended Reality is an umbrella term for different realities including a Virtual Reality (VR), an Augmented Reality (AR), and a Mixed Reality (MR), and is considered as an essential technology to enable the realization of digital twin/meta universe.
  • XR is incorporated as an agreed work item in Fifth Generation (5G) Advanced (i.e., 3GPP Release 18), which is targeted to provide a communication system framework that fulfills challenging needs of high data rate, low latency, and power efficient connectivity for XR applications.
  • 5G Fifth Generation
  • 3GPP Release 18 3GPP Release 18
  • the method comprises triggering, by a Medium Access Control (MAC) entity of the UE, a Delay Status Report (DSR) MAC Control Element (CE) for a delay status reporting, on determining the remaining time of at least one of the packet, the PDU, the PDU Set, and the SDU is less than the configured remaining time threshold.
  • MAC Medium Access Control
  • DSR Delay Status Report
  • CE MAC Control Element
  • the embodiments herein provide a UE comprising a processor, and a memory module.
  • the processor is coupled with the memory module.
  • the processor is configured to configure at least one remaining time threshold of at least one of a PDU, a PDU Set, and a SDU.
  • the remaining time threshold is received from a network.
  • the processor is configured to determine a remaining time of at least one of the packet, the PDU, the PDU Set, and the SDU.
  • the processor is configured to trigger a DSR MAC CE for a delay status reporting by a MAC entity, on determining the remaining time of at least one of the packet, the PDU, the PDU Set, and the SDU is less than the configured remaining time threshold.
  • the embodiments herein disclose methods and systems for buffered data delay reporting for Extended Reality (XR), and managing Medium Access Control (MAC) operations in a New Radio (NR).
  • XR Extended Reality
  • MAC Medium Access Control
  • NR New Radio
  • enhanced BSR MAC Control Element CE
  • new MAC CE XR MAC CE
  • XR BSR MAC CE XR BSR MAC CE
  • DSR MAC CE DSR MAC CE
  • buffer info and buffer size have been used interchangeably, and they imply the same interpretation and purpose.
  • Embodiments herein disclose methods and systems for buffered data delay reporting for extended reality in wireless networks.
  • the method includes configuring UE for buffered data delay reporting for the extended reality in the wireless networks.
  • the method includes determining, composing and sending the buffered data delay reporting for the extended reality in the wireless networks.
  • the method includes scheduling by a network for the buffered data for the UE based on the corresponding delay information reported.
  • one or more delay information is included in a Medium Access Control (MAC) Control Element (CE); for example, an enhanced Buffer Status Report (BSR) MAC CE or a new MAC CE (e.g., a Delay Status Reporting (DSR) MAC CE).
  • MAC Medium Access Control
  • BSR Buffer Status Report
  • DSR Delay Status Reporting
  • Each delay information may be associated to a corresponding buffer data size information.
  • the MAC CE therefore, may comprise of at least one of buffer data size information field, and delay information for a buffer data field.
  • a delay information field for a buffered data corresponds to at least one Logical Channel Group (LCG) which may be a group of Logical Channels (LCs). Further, at least one LCG in the MAC CE or the MAC CE entirely may pertain to Extended Reality (XR) services. Further, there may be one or more delay information fields for each LCG included in the MAC CE. Further, each delay information field may correspond to at least one buffered data size field included for the LCG in the MAC CE, and each of these buffered data size field may also be included along with the delay information field (for example, together, one-after-other, or in same order to provide a clear mapping between delay information and buffered data size in the MAC CE to the receiving entity).
  • LCG Logical Channel Group
  • XR Extended Reality
  • delay information fields when more than one delay information fields are included for the buffered data, they may be arranged in either ascending order or descending order of their delay values. This may be for multiple delay information fields for a single LCG or multiple delay information fields for multiple LCGs. Alternatively, multiple delay information fields for multiple LCGs may be arranged in the priority order of the LCGs.
  • the delay information for the buffered data may be at least one of the delay already experienced by the data since it was buffered (for example, data buffered in the Radio Link Control (RLC) storage and/or in a Protocol Data Convergence Protocol (PDCP) storage, where RLC storage and/PDCP storage may also be commonly referred to as L2 buffer) or further delay which the buffered data may withstand or allowed as per configuration or performance requirement perspective (for example, remaining duration for a Packet Delay Budget (PDB) or a PDU Set Delay Budget (PSDB) or remaining time for the pertinent PDCP discard timer expiry).
  • RLC Radio Link Control
  • PDCP Protocol Data Convergence Protocol
  • the delay information for the buffered data is quantized in at least one of uniform or non-uniform steps to derive mapping indices that represent the value or the range of values for the delay.
  • at least one static or semi-static table for example, delay table for XR and/or enhanced BSR table for XR
  • the index to the table entry can then represent the value or range of values for delay and can be utilized to be signaled in the delay information field.
  • the delay information could be expressed as a percentage or a fraction of the relevant PDB or PSDB for the XR applications (or logical channels or logical channel groups).
  • FIG. 5 depicts a system 500 for reporting a delay status in wireless communications.
  • the system 500 comprises a User Equipment (UE) 502, and a network 504, where the UE 502 performs buffered data delay reporting for extended reality.
  • the UE 502 comprises a processor 506, a protocol stack 508, a communication module 510, and a memory module 512.
  • the processor 506 further comprises a configuration module 514, and a Delay Status Report (DSR) module 516.
  • DSR Delay Status Report
  • the protocol stack 508 comprises the MAC entity 518, and a Packet Data Convergence Protocol (PDCP) layer 520.
  • the MAC entity 518 is triggered by the DSR module 516.
  • the MAC entity 518 triggers a DSR MAC Control Element (CE) for a delay status reporting, based on determining the remaining time of at least one of the packet, the PDU, the PDU Set, and the SDU is less than the configured remaining time threshold.
  • CE DSR MAC Control Element
  • the MAC entity 518 can determine the remaining time of the PDU Set from the remaining time of the PDCP discard timer of a first SDU of the PDU Set, if the first SDU of the PDU Set has the remaining time of the PDCP discard timer lesser than the configured at least one remaining time threshold.
  • the MAC entity 518 considers the remaining time as an actual remaining time for the delay status reporting at a transmission instant.
  • the MAC entity 518 transmits the DSR MAC CE including a buffer status with the actual remaining time at the transmission instant.
  • the MAC entity 518 reports at least one of an LCG index or identity, a threshold index, a remaining time, and a size of buffered data for at least one of the packet, the PDU, the PDU Set, and the SDU pertaining to at least one of the LCG index, the threshold index, the remaining time reported, and so on.
  • the MAC entity 518 considers the remaining time of the PDU Set, when the PDU Set based discard has been configured for a relevant radio bearer belonging to at least one of a logical channel, and an LCG.
  • the MAC entity 518 considers all SDUs of the PDU Set, for reporting the size of buffered data as the delay status reporting, if at least one SDU of the PDU Set has the remaining time of a PDCP discard timer lesser than the configured remaining time threshold.
  • the MAC entity 518 considers only the SDUs of the PDU Set for delay status reporting that have been received by the PDCP layer 520 of the UE 502, and for which the PDCP discard timer is running.
  • the MAC entity 518 considers the remaining time of at least one of the PDU, and the SDU, when the PDU Set based discard has not been configured for the relevant radio bearer belonging to at least one of the logical channel, and the LCG.
  • the MAC entity 518 considers at least one of the PDU, and the SDU, if at least one of the PDU, and the SDU has the remaining time of the PDCP discard timer lesser than the configured at least one remaining time threshold.
  • the MAC entity 518 verifies an uplink data pertaining to at least one of the packet, the PDU, the PDU Set, and the SDU, after triggering the DSR MAC CE for the delay status reporting based on the remaining time threshold.
  • the MAC entity 518 skips considering a discarded data for the delay status reporting in the DSR MAC CE, if the PDCP discard timer associated with the uplink data is completely expired by the time the DSR MAC CE is transmitted.
  • the MAC entity 518 cancels transmission of the DSR MAC CE, if all the uplink data is discarded by the time the DSR MAC CE is transmitted.
  • the MAC entity 518 considers a new uplink data to be included for the DSR MAC CE, if the new uplink data is available by the time the DSR MAC CE is transmitted.
  • the MAC entity 518 receives an indication of at least one of a congestion activation status, and a congestion deactivation status from the network 504.
  • the MAC entity 518 considers a remaining time of the uplink data for the delay status reporting as per the value of the PDCP discard timer configured for the uplink data during one of before congestion activation, and after congestion activation, on receiving the indication as activation of the congestion.
  • the MAC entity 518 suspends reporting of the delay status, during the congestion, for one or more PDU Sets with a PDU Set Importance (PSI) value below a PSI level, on receiving the indication as activation of the congestion.
  • PSI level is determined based on a UE implementation.
  • the MAC entity 518 resumes reporting of the delay status for the one or more PDU Sets with the PSI value below the PSI level, on receiving the indication as deactivation of the congestion.
  • the MAC entity 518 cancels transmission of the DSR MAC CE, on receiving one or more grants to transmit including all SDUs, and PDU Sets associated with the DSR.
  • the processor 506 can process and execute data of a plurality of modules of the UE 502.
  • the processor 506 can be configured to execute instructions stored in the memory module 512.
  • the processor 506 may comprise one or more of microprocessors, circuits, and other hardware configured for processing.
  • the processor 506 can be at least one of a single processer, a plurality of processors, multiple homogeneous or heterogeneous cores, multiple Central Processing Units (CPUs) of different kinds, microcontrollers, special media, and other accelerators.
  • CPUs Central Processing Units
  • the processor 506 may be an application processor (AP), a graphics-only processing unit (such as a graphics processing unit (GPU), a visual processing unit (VPU)), and/or an Artificial Intelligence (AI)-dedicated processor (such as a neural processing unit (NPU)).
  • AP application processor
  • GPU graphics processing unit
  • VPU visual processing unit
  • AI Artificial Intelligence
  • NPU neural processing unit
  • the plurality of modules of the processor 506 of the UE 502 can communicate via the communication module 510.
  • the communication module 510 may be in the form of either a wired network or a wireless communication network module.
  • the wireless communication network may comprise, but not limited to, Global Positioning System (GPS), Global System for Mobile Communications (GSM), Wi-Fi, Bluetooth low energy, Near-field communication (NFC), and so on.
  • the wireless communication may further comprise one or more of Bluetooth, ZigBee, a short-range wireless communication (such as Ultra-Wideband (UWB)), and a medium-range wireless communication (such as Wi-Fi) or a long-range wireless communication (such as 3G/4G/5G/6G and non-3GPP technologies or WiMAX), according to the usage environment.
  • a short-range wireless communication such as Ultra-Wideband (UWB)
  • a medium-range wireless communication such as Wi-Fi
  • Wi-Fi long-range wireless communication
  • 3G/4G/5G/6G and non-3GPP technologies or WiMAX 3G/4G/5G/6G and non-3GPP technologies or WiMAX
  • the memory module 512 may comprise one or more volatile and non-volatile memory components which are capable of storing data and instructions of the modules of the UE 502 to be executed.
  • Examples of the memory module 512 can be, but not limited to, NAND, embedded Multi Media Card (eMMC), Secure Digital (SD) cards, Universal Serial Bus (USB), Serial Advanced Technology Attachment (SATA), solid-state drive (SSD), and so on.
  • the memory module 512 may also include one or more computer-readable storage media. Examples of non-volatile storage elements may include magnetic hard discs, optical discs, floppy discs, flash memories, or forms of electrically programmable memories (EPROM) or electrically erasable and programmable (EEPROM) memories.
  • the memory module 512 may, in some examples, be considered a non-transitory storage medium.
  • the term “non-transitory” may indicate that the storage medium is not embodied in a carrier wave or a propagated signal. However, the term “non-transitory” should not be interpreted to mean that the memory module 512 is non-movable.
  • a non-transitory storage medium may store data that can, over time, change (for example, in Random Access Memory (RAM) or cache).
  • RAM Random Access Memory
  • FIG. 5 shows example modules of the UE 502, but it is to be understood that other embodiments are not limited thereon.
  • the UE 502 may include less or more number of modules.
  • the labels or names of the modules are used only for illustrative purpose and does not limit the scope of the invention.
  • One or more modules can be combined together to perform same or substantially similar function in the base station 502.
  • FIG. 6 depicts a method 600 for reporting a delay status by the UE 502.
  • the method 600 comprises configuring at least one remaining time threshold of at least one of a packet, a PDU, a PDU Set, and an SDU, as depicted in step 602.
  • the remaining time threshold is received from the network 504.
  • the method 600 comprises determining a remaining time of at least one of the packet, the PDU, the PDU Set, and the SDU, as depicted in step 604.
  • the method 600 comprises triggering, by the MAC entity 518 of the UE 502, a DSR MAC CE for a delay status reporting, on determining the remaining time of at least one of the packet, the PDU, the PDU Set, and the SDU is less than the configured remaining time threshold, as depicted in step 606.
  • method 600 may be performed in the order presented, in a different order or simultaneously. Further, in some embodiments, some actions listed in FIG. 6 may be omitted.
  • a new MAC CE (for example, enhanced BSR MAC CE or DSR MAC CE) can be used to carry only buffered data status for XR services (or LCs or LCGs).
  • the new MAC CE for XR services is identified and distinguished from legacy BSR MAC CE for non-XR services by one or more new Logical Channel Identities (LCIDs).
  • the new MAC CE for XR services is identified and distinguished from legacy BSR MAC CE for non-XR services by one or more new extended Logical Channel Identities (eLCIDs).
  • an eLCID for identifying new MAC CE for XR service is one octet in size.
  • the eLCID for identifying new MAC CE for XR service is two octets in size.
  • the new MAC CE can be a short BSR/DSR, a long BSR/DSR or a truncated BSR/DSR for XR services, and have corresponding new LCIDs; whereas, in an embodiment herein, the legacy BSR MAC CE is used to carry BSR for non-XR services (or LCs or LCGs). This is illustrated in FIG. 7, which depicts an XR BSR MAC CE format or DSR MAC CE format for carrying at least one delay amount information field, and one buffer size field for the corresponding LCGs configured for XR services.
  • the buffer status and the delay amount are included in the order of priority of the logical channel groups.
  • the threshold is provided by the network 504 in RRC signalling. In an embodiment herein, the threshold is configured per logical channel. In an embodiment herein, the threshold is configured per logical channel group. In an embodiment herein, the threshold is configured per PDU set. In an embodiment herein, the threshold is configured within the UE 502, based on standards or algorithms.
  • the transmitting PDCP entity and/or the MAC entity 518 may consider only the SDUs of the PDU Set that have been received by the PDCP layers and for which discardTimer(s) is/are running; i.e., the data pertaining to the SDU(s) of the PDU Set which is/are not yet received by the PDCP layer 520 is/are not considered.
  • the remaining time of the PDU Set of the first radio bearer and the remaining time of the SDU/PDU of the second radio bearer are considered for delay status reporting.
  • the first and second radio bearers belong to the same LCG. Accordingly, the corresponding uplink data (i.e., pertaining to the PDU Set and/or PDU/SDU) is considered for reporting in the delay status report.
  • the MAC entity 518 if the MAC entity 518 triggers the at least one of enhanced BSR MAC CE and XR BSR MAC CE (or termed as Delay Status Report (DSR)) for delay status reporting on meeting threshold condition, and the uplink data pertaining to the PDU/SDU or the PSU Set for which the associated PDCP discardTimer(s) is completely expired by the time the DSR MAC CE is transmitted, the MAC entity 518 does not consider the discarded data for delay status reporting in the DSR MAC CE. If all the uplink data pertaining to the delay reporting is discarded by the time DSR MAC CE could be transmitted, the MAC entity 518 cancels the transmission of the DSR MAC CE. If new uplink data gets available pertaining to the delay reporting by the time DSR MAC CE could be transmitted, the MAC entity 518 considers the new uplink data as well to be included for the DSR MAC CE.
  • DSR Delay Status Report
  • the UE 502 verifies if the remaining time of the PDU/SDU for the LCG becomes lesser than its associated remaining time threshold, as depicted in step 1010. If the remaining time of the PDU/SDU for the LCG is not lesser than its associated remaining time threshold, then the step of verification of the remaining time of the PDU/SDU for the LCG is repeated.
  • the MAC entity 518 triggers an enhanced BSR MAC CE or XR MAC CE or DSR MAC CE for delay status reporting and indicates at least one of remaining time or configured threshold index and/or the uplink data pertaining to the PDU/SDU and/or PDU Set, as depicted in step 1014.
  • the MAC entity 518 considers the remaining time of the uplink data for the delay reporting as per the value of discardTimer configured for the uplink data before the congestion activation.
  • the MAC entity 518 stops or suspends reporting of delay status (i.e., the DSR MAC CE) during the congestion, for the PDU Sets with a PSI below the configured threshold or configured/determined PSI level.
  • PSI level may be determined based on a UE implementation.
  • the MAC entity 518 resumes reporting of delay status (i.e., the DSR MAC CE), for the PDU Sets with a PSI below the configured threshold or configured/determined PSI level.
  • PSI level may be determined based on a UE implementation.
  • the enhanced BSR MAC CE (or DSR MAC CE) is triggered when the UE 502 is configured by the network 504 to trigger enhanced BSR MAC CE.
  • the enhanced BSR MAC CE (or DSR MAC CE) is triggered only when there are events for one or more specific logical channel groups configured by the network 504 for sending enhanced BSR MAC CE (or DSR MAC CE).
  • the configuration is received from the network 504 (for example, gNB) in RRC message such as RRC Reconfiguration or RRC Resume.
  • the UE 502 informs the network 504 whether it is capable for delay amount reporting. In an embodiment herein, this information is sent in the RRC procedures for UE capability information retrieval. In an embodiment herein, the capability is UE AS capability. In an embodiment herein, a common capability for the XR is used for delay amount reporting.
  • the MAC entity shall:
  • Uplink Shared Channel (UL-SCH) resources are available for a new transmission and the UL-SCH resources can accommodate the BSR MAC CE plus its subheader as a result of logical channel prioritization:
  • a scheduling request is triggered when the regular BSR/DSR is triggered for at least one logical channel for XR service.
  • This is termed as 'BSR for XR' or 'XR BSR' or DSR and corresponding MAC CE is termed as 'XR BSR MAC CE' or DSR MAC CE.
  • XR BSR MAC CE or DSR MAC CE may include at least one of the delay information field and buffered data size field for one or more LCGs. These LCGs pertain to and are configured for XR.
  • the example specification text is given as below:
  • the MAC entity shall:
  • At least one BSR/DSR triggered priori to MAC PDU assembly may be cancelled when a MAC PDU is transmitted.
  • This PDU includes a Long, Extended Long, Short, or Extended Short BSR/DSR MAC CE, Enhanced Short BSR/DSR MAC CE, and Enhanced Long BSR/DSR MAC CE which contains buffer status up to (and including) the last event that triggered a BSR/DSR prior to the MAC PDU assembly.
  • FIG. 13 depicts a sample structure of Long Delay reporting BSR/DSR MAC CE carrying the (average and/or least) 8-bit delay information of PDU set/PDU in that LCG.
  • enhanced BSR MAC CE or XR BSR MAC CE or DSR MAC CE when included in the message 1 (msg1) or message 3 (msg3) in the random access procedure, and there is retransmission of msg1 or msg3, the enhanced BSR MAC CE or XR BSR MAC CE or DSR MAC CE may be included with updating the BSR contents (for example, delay information and/or buffered data size).
  • the PDCP entity associated with an XR Radio bearer and/or PDCP entity configured by network 504 to calculate the delay information calculates the delay information used for generation of XR BSR or enhanced BSR/DSR for delay reporting.
  • the PDCP entity may calculate one or more delay information for the buffered data.
  • the transmitting entity of PDCP calculates one or combination of the following delay information:
  • the PDCP entity indicates at least one of or combination of the calculated value to MAC entity 518 for delay BSR (or DSR),
  • the RLC entity associated with a logical channel serving XR service and/or is configured by the network 504 to calculate the delay information used for generating XR BSR or enhanced BSR or DSR.
  • the RLC entity may calculate one or more delay information for the buffered data.
  • the transmitting RLC entity calculates one or combination of the following:
  • the network 504 configures the UE 502 on which of the delay quantities the PDCP/RLC entities has to measure as part of
  • data volume calculation for the purpose XR BSR or enhanced BSR or DSR is performed at the transmitting PDCP entity to determine PDCP data volume and at the transmitting RLC entity to determine RLC data volume.
  • PDCP data volume and/or RLC data volume may be categorized to one or more delay values or range of delay values for example, one or more range of delay values formed as between x percent and y percent or fraction of the packet delay budget or PDU Set delay budget.
  • four ranges can be: (a) less than 25%, (b) 25% to less than 50%, (c) 50% to less than 75% and (d) 75% to 100% of PDB or PSDB.
  • the PDCP entity provides the delay information to the RLC entity when the SDU/PDU/PDU Set is passed to the RLC entity, so that RLC entity can start from this given value of the delay and account for further delay in the RLC buffer.
  • the PDCP entity and/or RLC entity indicate the calculated data volume and the pertinent delay values or range of delay values to the MAC entity 518 for example, when the MAC entity 518 needs to compose and send the XR BSR MAC CE or enhanced BSR MAC CE or DSR MAC CE.
  • delay value or range of delay values can be the remaining duration to the expiry of the pertinent discard timer or completion of the PDB or PSDB.
  • the PDCP SDUs to be retransmitted and/or the PDCP Data PDUs to be retransmitted may also be considered.
  • the delay value or the range of delay values is accounted from the time when these data are buffered in the PDCP buffer from the application for the first transmission.
  • same delay amount is considered while calculating the PDCP data volume for both the MAC entities associated with primary RLC entity and the RLC entity other primary RLC entity.
  • the RLC data PDUs that are pending for retransmission may also be considered.
  • the delay value or the range of delay values is accounted from the time when these data were buffered in the PDCP buffer from the application for the first transmission.
  • the DSR procedure is used to provide the serving gNB with delay status of LCGs.
  • This delay status for an LCG includes remaining time, which is the smallest remaining value of the running PDCP discardTimer among PDCP SDUs that are buffered for the LCG but have not been transmitted in any MAC PDU as specified in clause 7.3 in TS 38.323 [4], and the total amount of delay-critical UL data for the LCG according to the data volume calculation procedure specified in clause 5.5 in TS 38.322 [3] and clause 5.15 in TS 38.323 [4] for the associated RLC and PDCP entities, respectively.
  • - remainingTimeThreshold the threshold on remaining time for triggering a DSR for a logical channel within an LCG.
  • the MAC entity 518 shall for each logical channel within the LCG:
  • the MAC entity 518 shall:
  • a PDCP SDU is considered to be associated with a DSR if it has not been transmitted in any MAC PDU and is a delay-critical PDCP SDU (as defined in TS38.323) associated with the logical channel which triggered the DSR.
  • a MAC PDU shall contain at most one DSR MAC CE.
  • a MAC PDU shall not contain a DSR MAC CE if it includes all PDCP SDUs associated with all the pending DSRs.
  • the MAC entity 518 shall cancel a pending DSR, when all the PDCP SDUs associated with the DSR have been discarded, or when a MAC PDU is transmitted and this MAC PDU includes a DSR MAC CE that contains the delay information of all the PDCP SDUs associated with the DSR (as described in the clause 6.1.3.72), or when a MAC PDU is transmitted and this MAC PDU includes all the PDCP SDUs associated with the DSR.
  • the MAC entity 518 includes a DSR MAC CE in a MAC PDU if the MAC PDU can accommodate all PDCP SDUs associated with all the pending DSRs but is not sufficient to additionally accommodate the DSR MAC CE plus its subheader.
  • the DSR MAC CE is identified by MAC subheader with an eLCID as specified in Table 6.2.1-2b.
  • the fields in the DSR MAC CE are defined as follows:
  • This field indicates the presence of delay information (i.e., the Remaining Time and Buffer Size fields) for the LCGi.
  • the LCGi field set to 1 indicates that the delay information for the LCGi is reported.
  • the LCGi field set to 0 indicates that the delay information for the LCGi is not reported;
  • This field indicates the shortest remaining value of running PDCP discardTimer (described in clause 7.3 in TS 38.323 [4]) among all PDCP SDUs that are buffered for an LCG but have not been transmitted in any MAC PDU, at the time of the first symbol of the first PUSCH transmission that includes this DSR MAC CE.
  • the length of this field is 6 bits. This field is present only if the buffer size indicated by the corresponding Buffer Size field is not zero; otherwise, this field is reserved and set to 0. If present, the value r in this field indicates a remaining time within the range of (r, r + 1) msec;
  • This field is present only if corresponding LCG is configured with additionalBS-TableAllowed and the buffer size indicated by the corresponding Buffer Size field is not zero; otherwise, this field is reserved and set to 0. If present, the BT field set to 1 indicates that the buffer sizes specified in Table 6.1.3.1-3 are used to set the value of the Buffer Size field, while the BT field set to 0 indicates that the buffer sizes specified in Table 6.1.3.1-2 are used instead;
  • the Buffer Size field indicates the total amount of delay-critical UL data for an LCG according to the data volume calculation procedure specified in clause 5.5 in TS 38.322 [3] and clause 5.6 in TS 38.323 [4] for the associated RLC and PDCP entities, respectively, after the MAC PDU has been built. If the corresponding LCG is configured with additionalBS-TableAllowed and the amount of delay-critical UL data for an LCG is within the buffer sizes specified in Table 6.1.3.1-3, the MAC entity 518 shall use the buffer sizes specified in Table 6.1.3.1-3 to set the value of this field; otherwise, the MAC entity 518 shall use Table 6.1.3.1-2 instead. This field is indicated in number of bytes. The length of this field is 8 bits.
  • the DSR MAC CE shall include delay information of all LCGs which have pending DSRs when the MAC PDU containing this DSR MAC CE is to be built.
  • the Remaining Time, the BT, and the Buffer Size fields for an LCG shall be reported in two consecutive octets. These three fields for different LCGs shall be included in a DSR MAC CE in ascending order based on the LCGi.
  • Delay-critical PDCP SDU if pdu-SetDiscard is not configured, a PDCP SDU for which the remaining time till discardTimer expiry is less than the remainingTimeThreshold. If pdu-SetDiscard is configured, a PDCP SDU belonging to a PDU Set of which at least one PDCP SDU has the remaining time till discardTimer expiry less than the remainingTimeThreshold.
  • the transmitting PDCP entity shall:
  • the transmitting PDCP entity shall consider the following as delay-critical PDCP data volume:
  • the MAC entity 518 may cancel the triggered Delay Status Reporting procedure upon resetting the MAC. In an embodiment herein, the MAC entity 518 may cancel the triggered Delay Status Reporting procedure upon the MAC reset when the MAC reset is triggered due to various reasons including, but not limiting to, based on a request from upper layers, a Layer Triggered Mobility (LTM) cell switch, ReconfigurationWithSync, a Secondary Cell Group (SCG) deactivation, and so on.
  • LTM Layer Triggered Mobility
  • SCG Secondary Cell Group
  • the DSR procedure is triggered by the MAC entity 518. Thereafter, on receiving a MAC reset request from the upper layers of the UE 502, the MAC entity 518 performs a MAC reset, as depicted in step 1604. The MAC entity 518 cancels the triggered DSR procedure, upon resetting the MAC, as depicted in step 1606.
  • method 1600 may be performed in the order presented, in a different order or simultaneously. Further, in some embodiments, some actions listed in FIG. 16 may be omitted.
  • the MAC entity 518 may perform the following procedure:
  • the MAC entity 518 may cancel the triggered DSR procedure upon the discard of PDU(s) or PDU Set(s).
  • the discard as mentioned in the present disclosure refers to the discard of PDUs or PDU Sets as performed by PDCP layer 520 in the UE 502 based on timer or PDU Set importance or any other conditions.
  • the MAC entity 518 may cancel the triggered DSR upon the discard of PDU(s) or PDU set(s) and the remaining time of the available PDU(s) after discard or the available PDU Set(s) after discard in an LCG, for which DSR is triggered, is not shorter than its associated/configured remainingTimeThreshold.
  • the MAC entity 518 may cancel triggered DSR procedure for a LCG, if the associated LCG is reconfigured. In an embodiment herein, the MAC entity 518 may cancel the triggered DSR procedure for a LCG, if the remainingTimeThreshold for the LCG is modified by the network 504 through an RRC message such as RRCReconfiguration message or RRCResume message. In an embodiment herein, the MAC entity 518 may cancel the triggered DSR for a LCG if it receives enough grants to transmit all the PDU(s) or PDU set(s) for the LCG.
  • the MAC entity 518 may cancel the triggered DSR for LCG if it receives enough grants to transmit all the PDU(s) or PDU set(s) for the LCG for which the remaining time is shorter than remainingTimeThreshold.
  • the UE 502 upon the discard of PDU(s) or PDU Set(s), if the DSR contains delay information for the UL data from multiple LCG(s) and the remaining time of the available UL PDU(s) after discard or the available UL PDU Set(s) after discard for all those LCG(s) for which DSR is triggered, is not shorter than its associated remainingTimeThreshold, the UE 502 cancels the triggered DSR procedure for those LCG(s).
  • the MAC entity 518 cancels triggered DSR procedure upon the discard of PDU(s) or PDU Set(s), if there is no UL data available in an LCG for which DSR is configured.
  • the UE 502 upon the discard of PDU(s) or PDU Set(s), if DSR contains delay information for the data from multiple LCG(s), the UE 502 cancels the triggered DSR procedure if there is no UL data available in all those LCG(s).
  • the UE 502 cancels the triggered DSR procedure. In an embodiment herein, if there is no UL data (PDU/PDU set) available at the time of transmission of DSR in an LCG for which DSR is triggered, the UE 502 cancels the triggered DSR procedure. In an embodiment herein, if there is no UL data (PDU/PDU set) available at the time of transmission of DSR, in all the LCG(s) for which the DSR is triggered, the UE 502 cancels the triggered DSR.
  • the UE 502 cancels the triggered DSR procedure.
  • the UE 502 cancels the triggered DSR procedure.
  • the UE 502 cancels the triggered DSR.
  • the UE 502 cancels the triggered DSR.
  • the MAC entity 518 may cancel the triggered buffer status report upon the discard of PDU or PDU set.
  • the MAC entity 518 may cancel the triggered SL-PRS resource request upon MAC Reset, i.e., the MAC entity 518 may cancel the triggered SL-PRS resource request upon the MAC reset.
  • FIG. 17 illustrates a method 1700 for DSR handling during SDU/PDU set discard.
  • the DSR procedure is triggered by the MAC entity 518. If PDU or PDU Set is discarded, the MAC entity 518 identifies remaining time of available PDU/PDU set, whether the remaining time of available PDU/PDU set is above DSR reporting threshold, as depicted in step 1704. If so, the MAC entity 518 cancels transmission of the DSR procedure, as depicted in step 1706.
  • method 1700 may be performed in the order presented, in a different order or simultaneously. Further, in some embodiments, some actions listed in FIG. 17 may be omitted.
  • FIG. 18 illustrates a method 1800 for a SL-PRS resource request handling during MAC reset.
  • the SL-PRS resource request is triggered by the MAC entity 518.
  • the MAC entity 518 performs a MAC reset, as depicted in step 1804.
  • the MAC entity 518 cancels the triggered SL-PRS resource request, upon resetting the MAC, as depicted in step 1806.
  • method 1800 may be performed in the order presented, in a different order or simultaneously. Further, in some embodiments, some actions listed in FIG. 18 may be omitted.
  • the MAC entity 518 may perform the following procedure:
  • the MAC entity 518 for DSR may have higher priority than MAC CE for SL-PRS resource request during logical channel prioritization.
  • the MAC CE for DSR has higher priority than the MAC CE for (Enhanced) Single Entry Power Headroom Reporting (PHR), or the MAC CE for (Enhanced) Multiple Entry PHR and has a lower priority than MAC CE for (Extended) BSR, with exception of BSR included for padding, during logical channel prioritization.
  • PHR Single Entry Power Headroom Reporting
  • the MAC CE for SL-PRS resource request may have higher priority than the MAC CE for Positioning Measurement Gap Activation/Deactivation Request and has a lower priority than the MAC CE for (Enhanced) Single Entry PHR, or the MAC CE for (Enhanced) Multiple Entry PHR, during logical channel prioritization.
  • one or more of the above embodiments may be represented as below in 3GPP specification TS 38.321.
  • Logical channels may be prioritized in accordance with the following order (highest priority listed first):
  • the MAC CE for SL-PRS resource request may have higher priority than the MAC CE for DSR during logical channel prioritization.
  • the MAC CE for DSR may have higher priority than the MAC CE for (Extended) BSR, with exception of BSR included for padding MAC CE and a lower priority than the MAC CE SL BSR, during logical channel prioritization.
  • the MAC CE for Positioning Measurement Gap Activation/Deactivation Request has higher priority than MAC CE for SL-PRS Resource Request, during logical channel prioritization.
  • the MAC CE for SL-PRS Resource Request has a higher priority than the MAC CE for the number of Desired Guard Symbols, during logical channel prioritization.
  • the MAC CE for DSR may be considered as higher priority than MAC CE for SL-PRS resource request during logical channel prioritization. If the UE 502 has both the MAC CE for DSR and the MAC CE for SL-PRS resource request and it is able to transmit only one of them (for e.g., due to resource limitations), the UE 502 may transmit the MAC CE for DSR.
  • the MAC CE for DSR may be considered as lower priority than the MAC CE for SL-PRS resource request during logical channel prioritization.
  • the proposed methods 600 focus on various UE actions performed for DSR procedure for XR or triggered SL-PRS resource request. Specifically, the methods 600 focus on the problem of how the delay status report procedure and the SL-PRS resource request maybe cancelled, and how the logical channel prioritization between DSR and SL-PRS resource request may be performed.
  • the embodiments disclosed herein can be implemented through at least one software program running on at least one hardware device and performing network management functions to control the network elements.
  • the elements include blocks which can be at least one of a hardware device, or a combination of hardware device and software module.
  • Headings and subheadings are used for convenience only and do not limit the disclosure.
  • the word exemplary is used to mean serving as an example or illustration. To the extent that the term “include,” “have,” or the like is used, such term is intended to be inclusive in a manner similar to the term “comprise” as “comprise” is interpreted when employed as a transitional word in a claim. Relational terms such as first and second and the like may be used to distinguish one entity or action from another without necessarily requiring or implying any actual such relationship or order between such entities or actions.
  • phrases such as an aspect, the aspect, another aspect, some aspects, one or more aspects, an implementation, the implementation, another implementation, some implementations, one or more implementations, an embodiment, the embodiment, another embodiment, some embodiments, one or more embodiments, a configuration, the configuration, another configuration, some configurations, one or more configurations, the subject technology, the disclosure, the present disclosure, other variations thereof and alike are for convenience and do not imply that a disclosure relating to such phrase(s) is essential to the subject technology or that such disclosure applies to all configurations of the subject technology.
  • a disclosure relating to such phrase(s) may apply to all configurations, or one or more configurations.
  • a disclosure relating to such phrase(s) may provide one or more examples.
  • a phrase such as an aspect or some aspects may refer to one or more aspects and vice versa, and this applies similarly to other foregoing phrases.
  • a phrase "at least one of” preceding a series of items, with the terms “and” or “or” to separate any of the items, modifies the list as a whole, rather than each member of the list.
  • the phrase "at least one of” does not require selection of at least one item; rather, the phrase allows a meaning that includes at least one of any one of the items, and/or at least one of any combination of the items, and/or at least one of each of the items.
  • each of the phrases “at least one of A, B, and C” or “at least one of A, B, or C” refers to only A, only B, or only C; any combination of A, B, and C; and/or at least one of each of A, B, and C.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

La divulgation concerne un système de communication 5G ou 6G destiné à prendre en charge un débit supérieur de transmission de données. Des modes de réalisation de la présente divulgation concernent des procédés (600) et des systèmes (500) permettant un rapport de retard de données mis en mémoire tampon pour une réalité étendue, et la gestion d'opérations de commande d'accès au support (MAC) dans une nouvelle radio (NR) de cinquième génération (5G). Les procédés (600) comprennent un rapport sur l'état de retard (DSR) pour une réalité étendue et une planification, par un réseau (504), de données mises en mémoire tampon pour un UE (502), sur la base d'informations de retard correspondantes rapportées. Les procédés (600) comprennent également une gestion de DSR pendant une réinitialisation de MAC, une gestion de DSR pendant une rejet d'unité de données de service (SDU)/PDU, et une gestion de demande de ressource de signal de référence de radiomessagerie de liaison latérale (SL-PRS) pendant une réinitialisation MAC. Les procédés (600) comprennent de même l'annulation d'une procédure DSR déclenchée lors de la réinitialisation du MAC. En outre, les procédés (600) comprennent l'annulation d'une demande de ressource SL-PRS déclenchée lors d'une réinitialisation MAC.
PCT/KR2024/013532 2023-09-06 2024-09-06 Procédés et appareil de gestion d'un rapport sur l'état de retard pour une réalité étendue Pending WO2025053687A1 (fr)

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Citations (1)

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Publication number Priority date Publication date Assignee Title
US20170374579A1 (en) * 2014-12-23 2017-12-28 Interdigital Patent Holdings, Inc. Methods for wifi integration in cellular systems

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Publication number Priority date Publication date Assignee Title
US20170374579A1 (en) * 2014-12-23 2017-12-28 Interdigital Patent Holdings, Inc. Methods for wifi integration in cellular systems

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JUHA KORHONEN, LENOVO: "Summary of [AT123][201][XR] XR MAC Ces", 3GPP DRAFT; R2-2309002; TYPE DISCUSSION; NR_XR_ENH-CORE, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), 30 August 2023 (2023-08-30), XP052500430 *
QUALCOMM INCORPORATED: "BSR enhancements for XR", 3GPP DRAFT; R2-2302515, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), 7 April 2023 (2023-04-07), XP052363996 *
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