Methods for transceiving packet data convergence protocol packet data unit in mobile communications
By modifying PDCP headers for segmentation and reassembling segments at the DU and CU, the method addresses the inefficiencies of layered architectures in LTE and NR, enhancing packet transmission efficiency and flexibility in next-generation mobile networks.
Patent Information
- Application Number
- PCT/CN2025/113149
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-08-07
- Filing Date
- 2025-08-07
- Publication Date
- 2026-02-12
AI Technical Summary
The existing layered architecture in LTE and NR mobile communications, involving PDCP, RLC, and MAC layers, leads to increased header overhead, processing complexity, and limited flexibility, especially in next-generation systems where efficiency and latency are critical.
Implementing a Distributed Unit (DU) to modify PDCP headers for segmentation information and a Centralized Unit (CU) to reassemble PDCP segments, potentially eliminating the need for an RLC layer, thereby reducing header overhead and processing complexity while maintaining packet transmission functionality.
This approach lowers overall header overhead and protocol-layer complexity while ensuring reliable packet transmission, adapting to evolving network requirements without compromising efficiency.
Smart Images

Figure CN2025113149_12022026_PF_FP_ABST
Abstract
Description
METHODS FOR TRANSCEIVING PACKET DATA CONVERGENCE PROTOCOL PACKET DATA UNIT IN MOBILE COMMUNICATIONSCROSS REFERENCE TO RELATED PATENT APPLICATION (S)
[0001] The present disclosure is part of a non-provisional application claiming the priority benefit of U.S. Patent Application No. 63 / 680,094, filed 7 August 2024, the content of which herein being incorporated by reference in its entirety.TECHNICAL FIELD
[0002] The present disclosure is generally related to mobile communications and, more particularly, to transceiving a Packet Data Convergence Protocol (PDCP) Packet Data Unit (PDU) with respect to apparatus in mobile communications.BACKGROUND
[0003] Unless otherwise indicated herein, approaches described in this section are not prior art to the claims listed below and are not admitted as prior art by inclusion in this section.
[0004] In Long-Term Evolution (LTE) or New Radio (NR) mobile communications, the data link layer is designed for enabling reliable, efficient, and structured delivery of data between the network apparatus. In particular, in the data link layer, there are Packet Data Convergence Protocol PDCP layer, Radio Link Control (RLC) layer, and Medium Access Control (MAC) layer. Different layers have different functionalities of processing network packets. In some scenarios, the PDCP layer may provide certain data processing functions, such as optional compression or delivery-related handling. The RLC layer may be configured to support various forms of data segmentation or transfer control. The MAC layer may perform operations related to resource coordination and transmission management. Collectively, these layers cooperate to facilitate data transport over the wireless communication interface.
[0005] However, with multiple protocol layers involved in processing network packets, the overall header overhead may become significant, especially in scenarios where efficiency and latency are critical. Additionally, maintaining separate functional layers such as PDCP, RLC, and MAC may introduce increased processing complexity, resource usage, and implementation burden on both the transmitter and receiver sides. This layered architecture may also limit flexibility when adapting to evolving requirements in next-generation mobile communication systems.
[0006] Accordingly, reducing header overhead and processing complexity while maintaining proper packet transmission functionality is an important consideration in the design of next-generation wireless communication networks. Therefore, there is a need for improved schemes that achieve such efficiency without compromising transmission reliability.SUMMARY
[0007] The following summary is illustrative only and is not intended to be limiting in any way. That is, the following summary is provided to introduce concepts, highlights, benefits and advantages of the novel and non-obvious techniques described herein. Select implementations are further described below in the detailed description. Thus, the following summary is not intended to identify essential features of the claimed subject matter, nor is it intended for use in determining the scope of the claimed subject matter.
[0008] An objective of the present disclosure is to propose solutions or schemes that address the aforementioned issues pertaining to transceiving a Packet Data Convergence Protocol (PDCP) Packet Data Unit (PDU) with respect to apparatus in mobile communications.
[0009] In one aspect, a method may involve a Distributed Unit (DU) receiving a PPDCP PDU from a Centralized Unit (CU) . The method may further involve the DU modifying a PDCP header of the PDCP PDU to include segmentation information.
[0010] In one aspect, a method may involve a CU receiving a plurality of PDCP segments from a DU. Each PDCP segment may include a PDCP header including segmentation information. The method may further involve the CU reassembling the plurality of PDCP segments into a PDCP Packet Data Unit (PDU) .
[0011] In one aspect, a method may involve a DU reassembling a plurality of PDCP segments into a PDCP PDU. Each PDCP segment may include a PDCP header including segmentation information. The method may further involve the DU transmitting the PDCP PDU to a CU.
[0012] In one aspect, a method may involve an apparatus obtaining a PPDCP PDU. The method may further involve the apparatus modifying a first PDCP header of the PDCP PDU to include first segmentation information. The method may further involve the apparatus transmitting the PDCP PDU including the first PDCP header to a User Equipment (UE) .
[0013] It is noteworthy that, although description provided herein may be in the context of certain radio access technologies, networks and network topologies such as Long-Term Evolution (LTE) , LTE-Advanced, LTE-Advanced Pro, 5th Generation (5G) , New Radio (NR) , Internet-of-Things (IoT) and Narrow Band Internet of Things (NB-IoT) , Industrial Internet of Things (IIoT) , and 6th Generation (6G) , the proposed concepts, schemes and any variation (s) / derivative (s) thereof may be implemented in, for and by other types of radio access technologies, networks and network topologies. Thus, the scope of the present disclosure is not limited to the examples described herein.BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The accompanying drawings are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of the present disclosure. The drawings illustrate implementations of the disclosure and, together with the description, serve to explain the principles of the disclosure. It is appreciable that the drawings are not necessarily in scale as some components may be shown to be out of proportion than the size in actual implementation in order to clearly illustrate the concept of the present disclosure.
[0015] FIG. 1 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0016] FIG. 2 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0017] FIG. 3 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0018] FIG. 4 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0019] FIG. 5 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0020] FIG. 6 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0021] FIG. 7 is a block diagram of an example communication system in accordance with an implementation of the present disclosure.
[0022] FIG. 8 is a flowchart of an example process in accordance with an implementation of the present disclosure.
[0023] FIG. 9 is a flowchart of an example process in accordance with an implementation of the present disclosure.
[0024] FIG. 10 is a flowchart of an example process in accordance with an implementation of the present disclosure.
[0025] FIG. 11 is a flowchart of an example process in accordance with an implementation of the present disclosure. DETAILED DESCRIPTION OF PREFERRED IMPLEMENTATIONS
[0026] Detailed embodiments and implementations of the claimed subject matters are disclosed herein. However, it shall be understood that the disclosed embodiments and implementations are merely illustrative of the claimed subject matters which may be embodied in various forms. The present disclosure may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments and implementations set forth herein. Rather, these exemplary embodiments and implementations are provided so that description of the present disclosure is thorough and complete and will fully convey the scope of the present disclosure to those skilled in the art. In the description below, details of well-known features and techniques may be omitted to avoid unnecessarily obscuring the presented embodiments and implementations. Overview
[0027] Implementations in accordance with the present disclosure relate to various techniques, methods, schemes and / or solutions pertaining to transceiving a Packet Data Convergence Protocol (PDCP) Packet Data Unit (PDU) with respect to apparatus in mobile communications. According to the present disclosure, a number of possible solutions may be implemented separately or jointly. That is, although these possible solutions may be described below separately, two or more of these possible solutions may be implemented in one combination or another.
[0028] Regarding the present disclosure, in some embodiments, a Centralized Unit (CU) may transmit a PDCP PDU to a Distributed Unit (DU) . The PDCP PDU may remain unsegmented. After receiving the PDCP PDU, the DU may modify a PDCP header of the PDCP PDU to include segmentation information if necessary. More specifically, the DU may receive the PDCP PDU and keep the PDCP PDU in a layer 2 (L2) buffer. Then, the DU may modify the PDCP header of the PDCP PDU to include the segmentation information when a segmentation is necessary during transport block generation.
[0029] FIG. 1 illustrates an example scenario 100 under schemes in accordance with implementations of the present disclosure. For example, data is processed by CU through the Service Data Adaptation Protocol (SDAP) module and a PDCP module to become a complete PDCP PDU. Then, the CU transmits the PDCP PDU to the DU via an F1 interface used between the CU and the DU. The DU receives the PDCP PDU and stores the PDCP PDU in the L2 buffer. Then, the DU modifies the PDCP header of the PDCP PDU to include the segmentation information when a segmentation is necessary during the Transport Block (TB) generation module.
[0030] More specifically, the segmentation information includes a segmentation indicator. In some cases, when the size of the PDCP PDU is larger than the size of the designated TB, the DU modifies the PDCP header to include a segmentation indicator having value 2 or 3. In some cases, when the size of the PDCP PDU is less than the size of the designated TB, the DU modifies the PDCP header to include a segmentation indicator having value 0 or 1.
[0031] Regarding the present disclosure, in some embodiments, the DU may receive a plurality of PDCP segments from an apparatus (e.g., a User Equipment (UE) ) . Each PDCP segment may include a PDCP header including segmentation information. The DU may reassemble the plurality of PDCP segments into a PDCP PDU (i.e., a complete PDCP PDU without segmentation) . Then, the DU may transmit the PDCP PDU to the CU. After receiving the PDCP PDU, the CU may process the PDCP PDU.
[0032] FIG. 2 illustrates an example scenario 200 under schemes in accordance with implementations of the present disclosure. For example, the DU receives a plurality of PDCP segments from an apparatus. Each PDCP segment includes a PDCP header, and each PDCP header includes a segmentation indicator. The DU processes the plurality of PDCP segments through a Medium Access Control (MAC) layer. The DU reassembles the plurality of PDCP segments into a complete PDCP PDU according to the segmentation indicators of the corresponding PDCP headers. Then, the DU transmits the PDCP PDU to the CU via an F1 interface used between the CU and the DU. After receiving the PDCP PDU, the CU processes the PDCP PDU through the PDCP module and the SDAP module to become data.
[0033] Regarding the present disclosure, in some embodiments, the DU may receive a plurality of PDCP segments from an apparatus (e.g., a UE) . Each PDCP segment may include a PDCP header including segmentation information. The DU may transmit the plurality of PDCP segments to the CU. After receiving the plurality of PDCP segments, the CU may reassemble the plurality of PDCP segments into a PDCP PDU (i.e., a complete PDCP PDU without segmentation) .
[0034] FIG. 3 illustrates an example scenario 300 under schemes in accordance with implementations of the present disclosure. For example, the DU receives a plurality of PDCP segments from an apparatus. Each PDCP segment includes a PDCP header, and each PDCP header includes a segmentation indicator. The DU processes the plurality of PDCP segments through a MAC layer. The DU transmits the plurality of PDCP segments to the CU via an F1 interface used between the CU and the DU. After receiving the plurality of PDCP segments, the CU reassembles the plurality of PDCP segments into a complete PDCP PDU according to the segmentation indicators of the corresponding PDCP headers. The CU processes the PDCP PDU through the PDCP module and the SDAP module to become data.
[0035] It should be noted that, based on the PDCP header including segmentation information, the above CU and DU scenarios may be implemented without Radio Link Control (RLC) layer. When other RLC functionalities are otherwise supported, the RLC layer processing may be eliminated entirely. As a result, the inclusion of an RLC header may no longer be necessary, thereby reducing processing complexity. Accordingly, overall header overhead and protocol-layer complexity may be lowered while still maintaining proper packet transmission functionality.
[0036] In addition, the SDAP module is for mapping QoS flows to data bearers. The PDCP module is for processing data into PDCP packets. The PDCP module may be associated with Robust Header Compression (ROHC) which is for compressing IP packet headers to reduce transmission overhead. The PDCP module may be associated with Ciphering / Deciphering which is for encrypting / decrypting user data to ensure confidentiality during wireless transmission. The TB generation module is for processing data into blocks suitable for physical layer transmission.
[0037] Regarding the present disclosure, in some embodiments, a network node may obtain a PDCP PDU. The network node may modify a first PDCP header of the PDCP PDU to include first segmentation information if necessary. The network node may transmit the PDCP PDU including the first PDCP header to a User Equipment (UE) .
[0038] In some implementations, the PDCP PDU may be obtained from another apparatus via a Base Station (BS) -to-BS interface under a split bearer scenario, which enables data delivery through multiple transmission paths (i.e., multiple legs) simultaneously. The BS-to-BS interface may include an Xn interface, an X2 interface, or a Next Generation (NG) interface (i.e., an interface connecting a next-generation base station to a legacy base station or another next-generation base station) .
[0039] In particular, the network node may include a next-generation node. The another apparatus may include a legacy node. The legacy node and the next-generation node may be deployed in the split bearer scenario. In some cases, the legacy node may be an anchor. The anchor may be the master node, which maintains session continuity during mobility and performs PDCP processing and traffic distribution.
[0040] FIG. 4 illustrates an example scenario 400 under schemes in accordance with implementations of the present disclosure. For example, the legacy node is the anchor and includes a legacy PDCP entity (i.e., a PDCP entity without the function of adding segmentation information into the PDCP header) . The legacy node transceives PDCP PDU with a device (e.g., UE) through PDCP entity, RLC entity and MAC entity via a first leg associated with the device.
[0041] Further, the legacy node transmits another PDCP PDU to the next-generation node via an X2-U interface. The another PDCP PDU transmitted between the legacy node and the next-generation node remains unsegmented. After receiving the another PDCP PDU, the next-generation node modifies a PDCP header of the another PDCP PDU to include segmentation information when a segmentation is necessary (depending on whether the size of the another PDCP PDU is larger than the size of the designated TB) . The next-generation transmits the another PDCP PDU / PDCP PDU segments to the device via a second leg associated with the device.
[0042] In addition, when the next-generation node receives a plurality of PDCP segments from the device, and each PDCP segment includes PDCP header including a segmentation indicator, the next-generation node reassembles the plurality of PDCP segments into a PDCP PDU (i.e., a complete PDCP PDU without segmentation) and transmits the PDCP PDU to the legacy node via the X2-U interface.
[0043] In this example, the PDCP PDU transmitted between the legacy node and the next-generation node remains unsegmented. The PDCP PDU transmitted between the next-generation node and the device is unsegmented or segmented. The next-generation node segments the PDCP PDU into PDCP segments and reassembles the PDCP segments into the PDCP PDU. In other words, PDCP segmentation and reassembly may be performed in the next-generation node.
[0044] FIG. 5 illustrates an example scenario 500 under schemes in accordance with implementations of the present disclosure. For example, the legacy node is the anchor and includes the next-generation PDCP entity (i.e., PDCP entity with the function of adding segmentation information into the PDCP header) . The legacy node transceives PDCP PDU with a device (e.g., UE) through the PDCP entity, RLC entity, and MAC entity via a first leg associated with the device.
[0045] Further, the legacy node transmits another PDCP PDU to the next-generation node via an X2-U interface. The another PDCP PDU transmitted from the legacy node to the next-generation node remains unsegmented. After receiving the another PDCP PDU, the next-generation node modifies a PDCP header of the another PDCP PDU to include segmentation information when a segmentation is necessary (depending on whether the size of the another PDCP PDU is larger than the size of the designated TB) . The next-generation node transmits the another PDCP PDU to the device via a second leg associated with the device.
[0046] In addition, when the next-generation node receives a plurality of PDCP segments from the device, and each PDCP segment includes a PDCP header including a segmentation indicator, the next-generation node transmits the plurality of PDCP segments to the legacy node. After receiving the plurality of PDCP segments, the legacy node reassembles the plurality of PDCP segments into a PDCP PDU (i.e., a complete PDCP PDU without segmentation) and processes the PDCP PDU. Alternatively, the next-generation node reassembles the plurality of PDCP segments into a PDCP PDU (i.e., a complete PDCP PDU without segmentation) and transmits the PDCP PDU to the legacy node via the X2-U interface.
[0047] In this example, the PDCP PDU transmitted from the legacy node to the next-generation node remains unsegmented. The PDCP PDU transmitted from the next generation node to the legacy node is unsegmented or segmented depending on network requirements. The legacy node is capable of processing PDCP PDU or reassembling PDCP segments into PDCP PDU. The PDCP PDU transmitted between the next-generation node and the device is unsegmented or segmented depending on TB size or transmission capability. The next-generation node segments the PDCP PDU into PDCP segments and reassembles the PDCP segments into the PDCP PDU. In other words, PDCP segmentation and reassembly may be performed in either the next-generation node and the legacy node.
[0048] In some implementations, the PDCP PDU may be obtained from an upper layer (e.g., SDAP layer, Radio Resource Control (RRC) layer, etc. ) of the network node. The network node and the another apparatus may be deployed under a split bearer scenario, which enables data delivery through multiple transmission paths (i.e., multiple legs) simultaneously.
[0049] In particular, the network node may include a next-generation node. The another apparatus may include a legacy node. In some cases, the next-generation node may be an anchor. The anchor may be the master node, which maintains session continuity during mobility and performs PDCP processing and traffic distribution.
[0050] FIG. 6 illustrates an example scenario 600 under schemes in accordance with implementations of the present disclosure. For example, the next-generation node is the anchor and includes the next-generation PDCP entity (i.e., PDCP entity with the function of adding segmentation information into the PDCP header) . The legacy node transceives the unsegmented PDCP PDU with the next-generation node via the X2-U interface. The legacy node transceives PDCP PDU with a device (e.g., UE) through the RLC entity and the MAC entity via a first leg associated with the device.
[0051] Further, before transmitting another PDCP PDU to the device via a second leg associated with the device, the next-generation node modifies a PDCP header of the another PDCP PDU to include segmentation information when a segmentation is necessary (depending on whether the size of the another PDCP PDU is larger than the size of the designated TB) . The next-generation transmits the another PDCP PDU / PDCP PDU segments to the device via the second leg.
[0052] In addition, when the next-generation node receives a plurality of PDCP segments from the device, and each PDCP segment includes a PDCP header including a segmentation indicator, the next-generation node reassembles the plurality of PDCP segments into a PDCP PDU (i.e., a complete PDCP PDU without segmentation) .
[0053] In this example, the PDCP PDU transmitted between the legacy node and the next-generation node remains unsegmented. The PDCP PDU transmitted between the next-generation node and the device is unsegmented or segmented. The next-generation node segments the PDCP PDU into PDCP segments and reassembles the PDCP segments into the PDCP PDU.
[0054] It should be noted that the segmentation information may include segmentation indicator. Each leg (i.e., the first leg and the second leg) may be responsible for transmitting the PDCP PDUs it has received. PDCP PDUs that have already been segmented may not be distributed across different legs. Each leg may also be responsible for reassembling the segmented PDCP PDUs it receives, based on its respective processing operations. Each leg may also be responsible for segmenting the PDCP PDUs it receives, based on its respective processing operations.
[0055] In some implementations, the PDCP PDU may be obtained from another apparatus via a BS-to-BS interface (e.g., Xn interface, X2 interface, NG interface, etc. ) under a handover procedure, which enables seamless mobility by transferring session context between network nodes.
[0056] In some cases, the direction of the handover procedure may be from another apparatus (e.g., New Radio (NR) BS) to the network node (e.g., next-generation BS) . PDCP entity of the another apparatus may forward complete PDCP PDUs from the last-transmitted PDU to the network node. Further, when transmission on the network node starts, the network node may segment the PDCP PDU for transmission.
[0057] In some cases, the direction of the handover procedure may be from the network node (e.g., next-generation BS) to the another apparatus (e.g., NR BS) . When one PDCP segment has already been transmitted to the receiver (e.g., a UE) , while another segment of the same PDCP PDU is still pending transmission, the remaining segment may be transmitted from the network node to the receiver before transmission on the target node begins. Alternatively, the entire segmented PDCP PDU may be forwarded in full to the target node. In some cases, when duplicate packet transfer is requested, every PDCP PDU may be forwarded to the another apparatus without segmentation. Illustrative Implementations
[0058] FIG. 7 illustrates an example communication system 700 having an example network apparatus 710 and an example network apparatus 720 in accordance with an implementation of the present disclosure. Each of network apparatus 710 and network apparatus 720 may perform various functions to implement schemes, techniques, processes and methods described herein pertaining to transceiving a PDCP PDU with respect to network apparatus in mobile communications, including scenarios / schemes described above as well as processes 800, 900, 1000 and 1100 described below.
[0059] Network apparatus 710 / 720 may be a part of a network apparatus, which may be a network node such as a satellite, a base station, a small cell, a router or a gateway. For instance, network apparatus 710 / 720 may be implemented in an eNodeB in an LTE network, in a gNB, a CU or a DU in a 5G / NR, IoT, NB-IoT or IIoT network or in a satellite or base station in a 6G network. For instance, network apparatus 710 / 720 may be implemented in a smartphone, a smartwatch, a personal digital assistant, a digital camera, or a computing equipment such as a tablet computer, a laptop computer or a notebook computer. Network apparatus 710 / 720 may also be a part of a machine type apparatus, which may be an IoT, NB-IoT, or IIoT apparatus such as an immobile or a stationary apparatus, a home apparatus, a wire communication apparatus or a computing apparatus. For instance, network apparatus 710 / 720 may be implemented in a smart thermostat, a smart fridge, a smart door lock, a wireless speaker or a home control center. Alternatively, network apparatus 710 / 720 may be implemented in the form of one or more integrated-circuit (IC) chips such as, for example and without limitation, one or more single-core processors, one or more multi-core processors, one or more reduced-instruction set computing (RISC) processors, or one or more complex-instruction-set-computing (CISC) processors. Network apparatus 710 / 720 may include at least some of those components shown in FIG. 7 such as a processor 712 / 714, for example. Network apparatus 710 / 720 may further include one or more other components not pertinent to the proposed scheme of the present disclosure (e.g., internal power supply, display device and / or user interface device) , and, thus, such component (s) of network apparatus 710 / 720 are neither shown in FIG. 7 nor described below in the interest of simplicity and brevity.
[0060] In one aspect, each of processor 712 and processor 722 may be implemented in the form of one or more single-core processors, one or more multi-core processors, or one or more CISC processors. That is, even though a singular term “a processor” is used herein to refer to processor 712 and processor 722, each of processor 712 and processor 722 may include multiple processors in some implementations and a single processor in other implementations in accordance with the present disclosure. In another aspect, each of processor 712 and processor 722 may be implemented in the form of hardware (and, optionally, firmware) with electronic components including, for example and without limitation, one or more transistors, one or more diodes, one or more capacitors, one or more resistors, one or more inductors, one or more memristors and / or one or more varactors that are configured and arranged to achieve specific purposes in accordance with the present disclosure. In other words, in at least some implementations, each of processor 712 and processor 722 is a special-purpose machine specifically designed, arranged and configured to perform specific tasks including transceiving a PDCP PDU in a network (e.g., as represented by network apparatus 710 / 720) in accordance with various implementations of the present disclosure.
[0061] In some implementations, network apparatus 710 / 720 may also include a transceiver 716 / 726 coupled to processor 712 / 722 and capable of wirelessly transmitting and receiving data. In other words, processor 712 / 722 may transceive the data such as configuration, message, signal, information, indicator, etc. via transceiver 716 / 726. In some implementations, network apparatus 710 / 720 may further include a memory 714 / 724 coupled to processor 712 / 722 and capable of being accessed by processor 712 / 722 and storing data therein. Accordingly, network apparatus 710 and network apparatus 720 may wirelessly communicate with each other via transceiver 716 and transceiver 726, respectively. To aid better understanding, the following description of the operations, functionalities and capabilities of each of network apparatus 710 and network apparatus 720 is provided in the context of a mobile communication environment in which network apparatus 710 is implemented in or as a network node or a CU / DU of a communication network.
[0062] In some implementations, each of memory 714 and memory 724 may include a type of random-access memory (RAM) such as dynamic RAM (DRAM) , static RAM (SRAM) , thyristor RAM (T-RAM) and / or zero-capacitor RAM (Z-RAM) . Alternatively, or additionally, each of memory 714 and memory 724 may include a type of read-only memory (ROM) such as mask ROM, programmable ROM (PROM) , erasable programmable ROM (EPROM) and / or electrically erasable programmable ROM (EEPROM) . Alternatively, or additionally, each of memory 714 and memory 724 may include a type of non-volatile random-access memory (NVRAM) such as flash memory, solid-state memory, ferroelectric RAM (FeRAM) , magnetoresistive RAM (MRAM) and / or phase-change memory. Illustrative Processes
[0063] FIG. 8 illustrates an example process 800 in accordance with an implementation of the present disclosure. Process 800 may be an example implementation of above scenarios / schemes, whether partially or completely, with respect to transceiving a PDCP PDU of the present disclosure. Process 800 may represent an aspect of implementation of features of a DU (e.g., network apparatus 710 / 720) . Process 800 may include one or more operations, actions, or functions as illustrated by one or more of blocks 810 and 820. Although illustrated as discrete blocks, various blocks of process 800 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks of process 800 may be executed in the order shown in FIG. 8 or, alternatively, in a different order. Process 800 may be implemented by DU (e.g., network apparatus 710 / 720 or machine type devices) . Solely for illustrative purposes and without limitation, process 800 is described below in the context of network apparatus 710 / 720. Process 800 may begin at block 810.
[0064] At block 810, process 800 may involve processor 712 / 722 of network apparatus 710 / 720 receiving a PDCP PDU from a CU. Process 800 may proceed from block 810 to block 820.
[0065] At block 820, process 800 may involve processor 712 / 722 of network apparatus 710 / 720 modifying a PDCP header of the PDCP PDU to include segmentation information.
[0066] In some implementations, the segmentation information may include a segmentation indicator.
[0067] FIG. 9 illustrates an example process 900 in accordance with an implementation of the present disclosure. Process 900 may be an example implementation of above scenarios / schemes, whether partially or completely, with respect to transceiving a PDCP PDU of the present disclosure. Process 900 may represent an aspect of implementation of features of a CU (e.g., network apparatus 710 / 720) . Process 900 may include one or more operations, actions, or functions as illustrated by one or more of blocks 910 and 920. Although illustrated as discrete blocks, various blocks of process 900 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks of process 900 may be executed in the order shown in FIG. 9 or, alternatively, in a different order. Process 900 may be implemented by CU (e.g., network apparatus 710 / 720 or machine type devices) . Solely for illustrative purposes and without limitation, process 900 is described below in the context of network apparatus 710 / 720. Process 900 may begin at block 910.
[0068] At block 910, process 900 may involve processor 712 / 722 of network apparatus 710 / 720 receiving a plurality of PDCP segments from a DU. Each PDCP segment may include a PDCP header including segmentation information. Process 900 may proceed from block 910 to block 920.
[0069] At block 920, process 900 may involve processor 712 / 722 of network apparatus 710 / 720 reassembling the plurality of PDCP segments into a PDCP PDU.
[0070] In some implementations, the segmentation information may include a segmentation indicator.
[0071] FIG. 10 illustrates an example process 1000 in accordance with an implementation of the present disclosure. Process 1000 may be an example implementation of above scenarios / schemes, whether partially or completely, with respect to transceiving a PDCP PDU of the present disclosure. Process 1000 may represent an aspect of implementation of features of a DU (e.g., network apparatus 710 / 720) . Process 1000 may include one or more operations, actions, or functions as illustrated by one or more of blocks 1010 and 1020. Although illustrated as discrete blocks, various blocks of process 1000 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks of process 1000 may be executed in the order shown in FIG. 10 or, alternatively, in a different order. Process 1000 may be implemented by DU (e.g., network apparatus 710 / 720 or machine type devices) . Solely for illustrative purposes and without limitation, process 1000 is described below in the context of network apparatus 710 / 720. Process 1000 may begin at block 1010.
[0072] At block 1010, process 1000 may involve processor 712 / 722 of network apparatus 710 / 720 reassembling a plurality of PDCP segments into a PDCP PDU. Each PDCP segment may include a PDCP header including segmentation information. Process 1000 may proceed from block 1010 to block 1020.
[0073] At block 1020, process 1000 may involve processor 712 / 722 of network apparatus 710 / 720 transmitting the PDCP PDU to a CU.
[0074] In some implementations, the segmentation information may include a segmentation indicator.
[0075] FIG. 11 illustrates an example process 1100 in accordance with an implementation of the present disclosure. Process 1100 may be an example implementation of above scenarios / schemes, whether partially or completely, with respect to transceiving a PDCP PDU of the present disclosure. Process 1100 may represent an aspect of implementation of features of a network node (e.g., network apparatus 710 / 720) . Process 1100 may include one or more operations, actions, or functions as illustrated by one or more of blocks 1110 to 1130. Although illustrated as discrete blocks, various blocks of process 1100 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks of process 1100 may be executed in the order shown in FIG. 11 or, alternatively, in a different order. Process 1100 may be implemented by network node (e.g., network apparatus 710 / 720 or any suitable network apparatus) . Solely for illustrative purposes and without limitation, process 1100 is described below in the context of network apparatus 710 / 720. Process 1100 may begin at block 1110.
[0076] At block 1110, process 1100 may involve processor 712 / 722 of network apparatus 710 / 720 obtaining a PDCP PDU. Process 1100 may proceed from block 1110 to block 1120.
[0077] At block 1120, process 1100 may involve processor 712 / 722 of network apparatus 710 / 720 modifying a first PDCP header of the PDCP PDU to include first segmentation information. Process 1100 may proceed from block 1120 to block 1130.
[0078] At block 1130, process 1100 may involve processor 712 / 722 of network apparatus 710 / 720 transmitting the PDCP PDU including the first PDCP header to a UE.
[0079] In some implementations, the first segmentation information may include a segmentation indicator.
[0080] In some implementations, the PDCP PDU is obtained from another apparatus via a BS-to-BS interface.
[0081] In some implementations, the BS-to-BS interface includes an Xn interface, an X2 interface or a Next Generation (NG) interface.
[0082] In some implementations, process 1100 may further involve processor 712 / 722 receiving a plurality of PDCP segments from the UE. Each PDCP segment may include a second PDCP header including second segmentation information. Process 1100 may further involve processor 712 / 722 transmitting the another PDCP PDU to the another apparatus via the BS-to-BS interface.
[0083] In some implementations, the second segmentation information may include a segmentation indicator.
[0084] In some implementations, process 1100 may further involve processor 712 / 722 receiving a plurality of PDCP segments from the UE. Each PDCP segment may include a second PDCP header including second segmentation information. Process 1100 may further involve processor 712 / 722 transmitting the plurality of PDCP segments to the another apparatus via the BS-to-BS interface for reassembling the plurality of PDCP segments into another PDCP PDU.
[0085] In some implementations, the second segmentation information may include a segmentation indicator.
[0086] In some implementations, the another apparatus may include an anchor base station.
[0087] In some implementations, the PDCP PDU may be obtained from an upper layer of network apparatus 710 / 720.
[0088] In some implementations, process 1100 may further involve processor 712 / 722 transmitting another PDCP PDU to another apparatus via an BS-to-BS interface.
[0089] In some implementations, the apparatus may include an anchor base station.
[0090] In some implementations, the steps may be performed during a handover procedure.
[0091] In some implementations, the BS-to-BS interface may include an Xn interface, an X2 interface or a NG interface. Additional Notes
[0092] The herein-described subject matter sometimes illustrates different components contained within, or connected with, different other components. It is to be understood that such depicted architectures are merely examples, and that in fact many other architectures can be implemented which achieve the same functionality. In a conceptual sense, any arrangement of components to achieve the same functionality is effectively "associated" such that the desired functionality is achieved. Hence, any two components herein combined to achieve a particular functionality can be seen as "associated with" each other such that the desired functionality is achieved, irrespective of architectures or intermedial components. Likewise, any two components so associated can also be viewed as being "operably connected" , or "operably coupled" , to each other to achieve the desired functionality, and any two components capable of being so associated can also be viewed as being "operably couplable" , to each other to achieve the desired functionality. Specific examples of operably couplable include but are not limited to physically mateable and / or physically interacting components and / or wirelessly interactable and / or wirelessly interacting components and / or logically interacting and / or logically interactable components.
[0093] Further, with respect to the use of substantially any plural and / or singular terms herein, those having skill in the art can translate from the plural to the singular and / or from the singular to the plural as is appropriate to the context and / or application. The various singular / plural permutations may be expressly set forth herein for sake of clarity.
[0094] Moreover, it will be understood by those skilled in the art that, in general, terms used herein, and especially in the appended claims, e.g., bodies of the appended claims, are generally intended as “open” terms, e.g., the term “including” should be interpreted as “including but not limited to, ” the term “having” should be interpreted as “having at least, ” the term “includes” should be interpreted as “includes but is not limited to, ” etc. It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more" to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim recitation to implementations containing only one such recitation, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an, " e.g., “a” and / or “an” should be interpreted to mean “at least one” or “one or more; ” the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should be interpreted to mean at least the recited number, e.g., the bare recitation of "two recitations, " without other modifiers, means at least two recitations, or two or more recitations. Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc. ” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention, e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and / or A, B, and C together, etc. In those instances where a convention analogous to “at least one of A, B, or C, etc. ” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention, e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and / or A, B, and C together, etc. It will be further understood by those within the art that virtually any disjunctive word and / or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B. ”
[0095] From the foregoing, it will be appreciated that various implementations of the present disclosure have been described herein for purposes of illustration, and that various modifications may be made without departing from the scope and spirit of the present disclosure. Accordingly, the various implementations disclosed herein are not intended to be limiting, with the true scope and spirit being indicated by the following claims.
Claims
1.A method, comprising:receiving, by a processor of a Distributed Unit (DU) , a Packet Data Convergence Protocol (PDCP) Packet Data Unit (PDU) from a Centralized Unit (CU) ; andmodifying, by the processor, a PDCP header of the PDCP PDU to include segmentation information.2.The method of Claim 1, wherein the segmentation information includes a segmentation indicator.3.A method, comprising:receiving, by a processor of a Centralized Unit (CU) , a plurality of Packet Data Convergence Protocol (PDCP) segments from a Distributed Unit (DU) , wherein each PDCP segment includes a PDCP header including segmentation information; andreassembling, by the processor, the plurality of PDCP segments into a PDCP Packet Data Unit (PDU) .4.The method of Claim 3, wherein the segmentation information includes a segmentation indicator.5.A method, comprising:reassembling, by a processor of a Distributed Unit (DU) , a plurality of Packet Data Convergence Protocol (PDCP) segments into a PDCP Packet Data Unit (PDU) , wherein each PDCP segment includes a PDCP header including segmentation information; andtransmitting, by the processor, the PDCP PDU to a Centralized Unit (CU) .6.The method of Claim 5, wherein the segmentation information includes a segmentation indicator.7.A method, comprising:obtaining, by a processor of an apparatus, a Packet Data Convergence Protocol (PDCP) Packet Data Unit (PDU) ;modifying, by the processor, a first PDCP header of the PDCP PDU to include first segmentation information; andtransmitting, by the processor, the PDCP PDU including the first PDCP header to a User Equipment (UE) .8.The method of Claim 7, wherein the first segmentation information includes a segmentation indicator.9.The method of Claim 7, wherein the PDCP PDU is obtained from another apparatus via a Base Station (BS) -to-BS interface.10.The method of Claim 9, wherein the BS-to-BS interface includes an Xn interface, an X2 interface or a Next Generation (NG) interface.11.The method of Claim 9, further comprising:receiving, by the processor, a plurality of PDCP segments from the UE, wherein each PDCP segment includes a second PDCP header including second segmentation information;reassembling, by the processor, the plurality of PDCP segments into another PDCP PDU; andtransmitting, by the processor, the another PDCP PDU to the another apparatus via the BS-to-BS interface.12.The method of Claim 11, wherein the second segmentation information includes a segmentation indicator.13.The method of Claim 9, further comprising:receiving, by the processor, a plurality of PDCP segments from the UE, wherein each PDCP segment includes a second PDCP header including second segmentation information; andtransmitting, by the processor, the plurality of PDCP segments to the another apparatus via the BS-to-BS interface for reassembling the plurality of PDCP segments into another PDCP PDU.14.The method of Claim 13, wherein the second segmentation information includes a segmentation indicator.15.The method of Claim 9, wherein the another apparatus includes an anchor base station.16.The method of Claim 7, wherein the PDCP PDU is obtained from an upper layer of the apparatus.17.The method of Claim 15, further comprising:transmitting, by the processor, another PDCP PDU to the another apparatus via a BS-to-BS interface.18.The method of Claim 15, wherein the apparatus includes an anchor base station.19.The method of Claim 9, wherein the steps are performed during a handover procedure.20.The method of Claim 19, wherein the BS-to-BS interface includes an Xn interface, an X2 interface or a Next Generation (NG) interface.
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