Segmentation at PDCP entity for data transmission
By performing segmentation at the PDCP entity, the wireless communication system addresses redundant sequence number addition at RLC and PDCP entities, resulting in a more efficient and simplified data transmission process.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-05-20
- Publication Date
- 2026-04-09
AI Technical Summary
Existing wireless communication systems redundantly add sequence numbers at both the RLC and PDCP entities, leading to unnecessary complexity and inefficiency in data transmission.
Perform segmentation of PDCP service data units (SDUs) at the PDCP entity instead of the RLC entity, allowing for simplified implementation by generating segments with associated message authentication codes and transmitting them via a transceiver.
Simplifies the wireless communication process by eliminating redundant operations at the RLC entity, enhancing efficiency and reducing complexity in data transmission.
Smart Images

Figure CN2025096119_09042026_PF_FP_ABST
Abstract
Description
SEGMENTATION AT PDCP ENTITY FOR DATA TRANSMISSIONTECHNICAL FIELD
[0001] The present disclosure relates to wireless communications, and more specifically to network nodes and methods performed by the network nodes for supporting segmentation at a packet data convergence protocol (PDCP) entity for data transmission.BACKGROUND
[0002] A wireless communications system may include one or multiple network communication devices, such as base stations, which may be otherwise known as an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology. Each network communication devices, such as a base station may support wireless communications for one or multiple user communication devices, which may be otherwise known as UE, or other suitable terminology. The wireless communications system may support wireless communications with one or multiple user communication devices by utilizing resources of the wireless communication system (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers) . Additionally, the wireless communications system may support wireless communications across various radio access technologies including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) radio access technology, among other suitable radio access technologies beyond 5G (e.g., sixth generation (6G) ) .
[0003] Each of a radio link control (RLC) entity and a PDCP entity adds a sequence number (SN) for the same data in each header. Transmitting (TX) entity assigns an SN for an RLC SDU corresponding to a PDCP SDU for acknowledged mode (AM) data radio bearer (DRB) , or for an RLC SDU segment for unacknowledged mode (UM) DRB, and add the SN in an RLC header. TX PDCP entity assigns an SN for a PDCP SDU and adds the SN in a PDCP header. Both RLC entity and PDCP entity redundantly add SNs for a packet. In addition, both PDCP entity and RLC entity have discard operation for the same data, and there is interaction between PDCP entity and RLC entity to support discard function in TX side. Therefore, a simplified Layer 2 protocol is needed for a DRB by removing RLC entity to avoid redundant operations at PDCP entity and RLC entity.SUMMARY
[0004] The present disclosure relates to devices and methods that support segmentation at a PDCP entity for data transmission. With the devices and methods, segmentation of a PDCP SDU can be performed at a PDCP entity instead of RLC entity, and thus implementation of the first device may be simplified.
[0005] Some implementations of a first device for wireless communication described herein may include a processor and a transceiver coupled to the processor, wherein the processor is configured to: perform, at a packet data convergence protocol (PDCP) entity of the first device, segmentation of a PDCP service data unit (SDU) or a portion comprising the PDCP SDU and a message authentication code for integrity (MAC-I) associated with the PDCP SDU to generate a segment; and transmit a PDCP protocol data unit (PDU) including the segment via the transceiver to a second device for wireless communication, wherein the PDCP PDU comprises information related to the segmentation.
[0006] In some implementations, the segment is a segment of the portion comprising the PDCP SDU and the MAC-I or a segment of the PDCP SDU.
[0007] In some implementations, the processor is further configured to: perform at least one of the following for the PDCP SDU: integrity protection or ciphering.
[0008] In some implementations, the processor is further configured to: perform integrity protection for the PDCP SDU and a portion of PDCP header of the PDCP PDU, wherein the portion of PDCP header excludes the information related to the segmentation.
[0009] In some implementations, the processor is further configured to: perform at least one of the following for a portion of the PDCP PDU excluding the information related to the segmentation: integrity protection or ciphering.
[0010] In some implementations, the processor is further configured to: perform at least one of the following for a portion of the PDCP PDU comprising the information related to the segmentation: integrity protection or ciphering.
[0011] In some implementations, the information related to the segmentation comprises a first indication indicating whether the PDCP PDU contains a complete PDCP SDU or contains a start, middle or end segment of the PDCP SDU.
[0012] In some implementations, the information related to the segmentation comprises a first indication indicating whether the PDCP PDU contains a complete PDCP SDU and MAC-I or contains a start, middle or end segment of a portion comprising the PDCP SDU and MAC-I.
[0013] In some implementations, the PDCP SDU is a ciphered PDCP SDU that is not integrity protected. In such implementations, the processor is configured to perform the segmentation of the PDCP SDU by performing the segmentation of the ciphered PDCP SDU.
[0014] In some implementations, the information related to the segmentation comprises a second indication indicating a position of the PDCP SDU segment in bytes within a portion comprising the ciphered PDCP SDU.
[0015] In some implementations, the processor is further configured to: perform integrity protection for the PDCP SDU to generate a message authentication code for integrity (MAC-I) associated with the PDCP SDU; and perform ciphering for the PDCP SDU to generate a ciphered PDCP SDU. In such implementations, the processor is configured to perform the segmentation of the PDCP SDU by performing the segmentation of the ciphered PDCP SDU and the MAC-I. In other words, the processor is configured to perform the segmentation of the ciphered PDCP SDU plus the MAC-I.
[0016] In some implementations, the information related to the segmentation comprises a second indication indicating a position of a PDCP SDU segment in bytes within a portion comprising the PDCP SDU and the MAC-I. In other words, the second indication may indicate a position of a PDCP SDU segment in bytes within a portion comprising the PDCP SDU plus the MAC-I.
[0017] In some implementations, the processor is further configured to: perform integrity protection for the PDCP SDU to generate a MAC-I associated with the PDCP SDU. In such implementations, the processor is configured to perform the segmentation of the PDCP SDU by performing the segmentation of the PDCP SDU and the MAC-I. In other words, the processor is configured to perform the segmentation of the ciphered PDCP SDU plus the MAC-I.
[0018] In some implementations, the information related to the segmentation comprises a second indication indicating a position of a PDCP SDU segment in bytes within a portion comprising the PDCP SDU and the MAC-I. In other words, the second indication may indicate a position of a PDCP SDU segment in bytes within a portion comprising the PDCP SDU plus the MAC-I.
[0019] In some implementations, the processor is configured to perform the segmentation of the PDCP SDU by performing the segmentation of the PDCP SDU without ciphering.
[0020] In some implementations, the information related to the segmentation comprises a second indication indicating a position of a PDCP SDU segment in bytes within a portion comprising the PDCP SDU.
[0021] In some implementations, the PDCP PDU comprises a third indication indicating whether the information related to the segmentation is integrity protected.
[0022] In some implementations, the processor is further configured to: receive a PDCP configuration via the transceiver from the second device, wherein the PDCP configuration indicates whether the information related to the segmentation is to be integrity protected.
[0023] In some implementations, the processor is further configured to: after performing the segmentation of the PDCP SDU to generate PDCP SDU segments, perform at least one of the following for the PDCP PDU comprising the PDCP SDU segments: integrity protection, or ciphering.
[0024] In some implementations, the PDCP entity is triggered to perform connection re-establishment. In such implementations, the processor is further configured to: remove a PDCP SDU segment or a PDCP PDU including the PDCP SDU segment, for which the successful delivery of the PDCP PDU has not been confirmed by the first device; or remove the PDCP PDU which comprises the PDCP SDU segment.
[0025] In some implementations, the processor is further configured to: receive a configuration for the segmentation via the transceiver from the second device. In such implementations, the processor is configured to perform the segmentation of the PDCP SDU based on the configuration.
[0026] In some implementations, the processor is further configured to: assign sequence numbers for PDCP SDU segments; or assign a single sequence number for the PDCP SDU segments.
[0027] In some implementations, the processor is further configured to: use the information related to the segmentation as input for at least one of the following for the PDCP SDU or the PDCP SDU segment: integrity protection or ciphering.
[0028] In some implementations, the processor is further configured to: receive a configuration for the integrity protection or ciphering via the transceiver from the second device, wherein the PDCP configuration indicates whether to use the information related to the segmentation as input for at least one of the following for the PDCP SDU or PDCP SDU segment: integrity protection or ciphering.
[0029] In some implementations, the processor is further configured to: perform at least one of the following for PDCP SDU segments: integrity protection or ciphering.
[0030] Some implementations of a second device for wireless communication described herein may include a processor and a transceiver coupled to the processor, wherein the processor is configured to: receive a PDCP PDU including a PDCP SDU segment via the transceiver from a first device for wireless communication, wherein the PDCP PDU comprises information related to segmentation of a PDCP SDU or a portion comprising the PDCP SDU and a MAC-I associated with the PDCP SDU; and reassemble, at a PDCP entity of the second device, the PDCP SDU based on PDCP SDU segments and the information related to segmentation.
[0031] In some implementations, the segment is a segment of the portion comprising the PDCP SDU and the MAC-I or a segment of the PDCP SDU.
[0032] In some implementations, the processor is further configured to: perform at least one of the following for the PDCP SDU or the PDCP PDU: integrity verification or deciphering.
[0033] In some implementations, the processor is further configured to: perform integrity verification for the PDCP SDU and a portion of PDCP header of the PDCP PDU, wherein the portion of PDCP header of the PDCP PDU excludes the information related to segmentation.
[0034] In some implementations, the processor is further configured to: perform at least one of the following for a portion of the PDCP PDU excluding the information related to segmentation: integrity verification or deciphering.
[0035] In some implementations, the processor is further configured to: perform at least one of the following for a portion of the PDCP PDU including the information related to segmentation: integrity verification or deciphering.
[0036] In some implementations, the processor is further configured to: use the information related to the segmentation as input for at least one of the following for the PDCP SDU or the PDCP PDU: integrity verification or deciphering.
[0037] In some implementations, the processor is further configured to: receive a configuration for the integrity protection or ciphering via the transceiver from the first device, wherein the PDCP configuration indicates whether to use the information related to the segmentation as input for at least one of the following for the PDCP SDU or the PDCP PDU: integrity protection or ciphering.
[0038] In some implementations, the processor is further configured to: receive a PDCP configuration via the transceiver from the first device, wherein the PDCP configuration indicates whether the information related to the segmentation is to be integrity protected or ciphered.
[0039] In some implementations, the PDCP PDU comprising the information related to the segmentation comprises a first indication, wherein the first indication indicates whether the PDCP PDU contains a complete PDCP SDU or contains a start, middle or end segment of the PDCP SDU.
[0040] In some implementations, the PDCP PDU comprising the information related to the segmentation comprises a first indication, wherein the first indication indicates whether the PDCP PDU contains a complete PDCP SDU and MAC-I or contains a start, middle or end segment of a portion comprising the PDCP SDU and MAC-I.
[0041] In some implementations, the PDCP PDU comprising the information related to the segmentation comprises a second indication, wherein the second indication indicates a position of the PDCP SDU segment in bytes within a portion comprising the PDCP SDU or ciphered PDCP SDU.
[0042] In some implementations, the PDCP PDU comprising the information related to the segmentation comprises a second indication, wherein the second indication indicates a position of the PDCP SDU segment in bytes within a portion comprising the PDCP SDU and a MAC-I for integrity verification. The PDCP SDU may be ciphered. In other words, the second indication may indicate a position of the PDCP SDU segment in bytes within a portion comprising the PDCP SDU plus MAC-I for integrity verification.
[0043] In some implementations, the PDCP PDU comprises a third indication indicating whether the information related to the segmentation is integrity protected.
[0044] Some implementations of a method described herein may include: performing, at a PDCP entity of the first device, segmentation of a PDCP SDU or a portion comprising the PDCP SDU and a MAC-I associated with the PDCP SDU to generate a segment; and transmitting a PDCP PDU including the segment to a second device for wireless communication, wherein the PDCP PDU comprises information related to the segmentation.
[0045] Some implementations of a method described herein may include: receiving a PDCP PDU including a segment at a second device from a first device for wireless communication, wherein the PDCP PDU comprises information related to segmentation of a PDCP SDU or a portion comprising the PDCP SDU and a MAC-I associated with the PDCP SDU; and reassembling, at a PDCP entity of the second device, the PDCP SDU based on PDCP SDU segments and the information related to segmentation.
[0046] Some implementations of a processor described herein may include at least one memory and a controller coupled with the at least one memory and configured to cause the controller to: perform, at a PDCP entity of the first device, segmentation of a PDCP SDU or a portion comprising the PDCP SDU and a MAC-I associated with the PDCP SDU to generate a segment; and transmit a PDCP PDU including the segment via a transceiver to a second device for wireless communication, wherein the PDCP PDU comprises information related to the segmentation.
[0047] Some implementations of a processor described herein may include at least one memory and a controller coupled with the at least one memory and configured to cause the controller to: receive a PDCP PDU including a segment via a transceiver from a first device for wireless communication, wherein the PDCP PDU comprises information related to segmentation of a PDCP SDU or a portion comprising the PDCP SDU and a MAC-I associated with the PDCP SDU; and reassemble, at a PDCP entity of the second device, the PDCP SDU based on PDCP SDU segments and the information related to segmentation.
[0048] It is to be understood that the summary section is not intended to identify key or essential features of embodiments of the present disclosure, nor is it intended to be used to limit the scope of the present disclosure. Other features of the present disclosure will become easily comprehensible through the following description.BRIEF DESCRIPTION OF THE DRAWINGS
[0049] Fig. 1 illustrates an example of a wireless communications system that supports segmentation at a PDCP entity for data transmission in accordance with aspects of the present disclosure;
[0050] Fig. 2 illustrates another example of a wireless communications system that supports segmentation at a PDCP entity for data transmission in accordance with aspects of the present disclosure;
[0051] Fig. 3 illustrates a further example of a wireless communications system that supports segmentation at a PDCP entity for data transmission in accordance with aspects of the present disclosure;
[0052] Fig. 4 illustrates a signaling diagram illustrating an example process that supports segmentation at a PDCP entity for data transmission in accordance with aspects of the present disclosure;
[0053] Fig. 5 illustrates a signaling diagram illustrating an example process that supports segmentation at a PDCP entity for data transmission in accordance with aspects of the present disclosure;
[0054] Figs. 6 and 7 illustrate an example of a PDCP PDU in accordance with aspects of the present disclosure, respectively;
[0055] Figs. 8 and 9 illustrates a signaling diagram illustrating an example process that supports segmentation at a PDCP entity for data transmission in accordance with aspects of the present disclosure, respectively;
[0056] Fig. 10 illustrates an example of a device that supports segmentation at a PDCP entity for data transmission in accordance with some aspects of the present disclosure;
[0057] Fig. 11 illustrates an example of a processor that supports segmentation at a PDCP entity for data transmission in accordance with aspects of the present disclosure; and
[0058] Figs. 12 and 13 illustrate a flowchart of a method that supports segmentation at a PDCP entity for data transmission in accordance with aspects of the present disclosure, respectively.DETAILED DESCRIPTION
[0059] Principles of the present disclosure will now be described with reference to some embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitation as to the scope of the disclosure. The disclosure described herein may be implemented in various manners other than the ones described below.
[0060] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skills in the art to which this disclosure belongs.
[0061] References in the present disclosure to “one embodiment, ” “an example embodiment, ” “an embodiment, ” “some embodiments, ” and the like indicate that the embodiment (s) described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment (s) . Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
[0062] It shall be understood that although the terms “first” and “second” or the like may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could also be termed as a second element, and similarly, a second element could also be termed as a first element, without departing from the scope of embodiments. As used herein, the term “and / or” includes any and all combinations of one or more of the listed terms.
[0063] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a” , “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” , “comprising” , “has” , “having” , “includes” and / or “including” , when used herein, specify the presence of stated features, elements, and / or components etc., but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof.
[0064] As described above, a simplified Layer 2 protocol is needed for a radio bearer (e.g., data radio bearer (DRB) or signaling radio bearer (SRB) ) by removing RLC entity to avoid redundant operations at PDCP entity and RLC entity. For example, the control protocol layer for SRB comprises the RRC layer, PDCP layer, MAC layer and PHY layer.
[0065] In view of the above, the present disclosure provides a solution that supports segmentation at a PDCP entity for data or RRC message transmission. In this solution, a first device for wireless communication performs, at a PDCP entity of the first device, segmentation of a PDCP SDU or a portion comprising the PDCP SDU and a MAC-I associated with the PDCP SDU to generate a segment. In turn, the first device transmits a PDU including the segment via the transceiver to a second device for wireless communication. The PDCP PDU comprises information related to the segmentation. The information related to segmentation may be included in PDCP header or PDCP payload (i.e., data part) . With this solution, segmentation of a PDCP SDU can be performed at a PDCP entity instead of RLC entity, and thus implementation of the first device may be simplified.
[0066] Aspects of the present disclosure are described in the context of a wireless communications system.
[0067] Fig. 1 illustrates an example of a wireless communications system 100 that supports segmentation at a PDCP entity for data transmission in accordance with aspects of the present disclosure. The wireless communications system 100 may include one at least one of network entities 102 (also referred to as network equipment (NE) ) , one or more terminal devices or UEs 104, a core network 106, and a packet data network 108. The wireless communications system 100 may support various radio access technologies. In some implementations, the wireless communications system 100 may be a 4G network, such as an LTE network or an LTE-advanced (LTE-A) network. In some other implementations, the wireless communications system 100 may be a 5G network, such as an NR network. In other implementations, the wireless communications system 100 may be a combination of a 4G network and a 5G network, or other suitable radio access technology including institute of electrical and electronics engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20. The wireless communications system 100 may support radio access technologies beyond 5G. Additionally, the wireless communications system 100 may support technologies, such as time division multiple access (TDMA) , frequency division multiple access (FDMA) , or code division multiple access (CDMA) , etc.
[0068] The network entities 102 may be dispersed throughout a geographic region to form the wireless communications system 100. One or more of the network entities 102 described herein may be or include or may be referred to as a network node, a base station (BS) , a network element, a radio access network (RAN) node, a base transceiver station, an access point, a NodeB, an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology. A network entity 102 and a UE 104 may communicate via a communication link 110, which may be a wireless or wired connection. For example, a network entity 102 and a UE 104 may perform wireless communication (e.g., receive signaling, transmit signaling) over a Uu interface. The network entities 102 may be collectively referred to as network entities 102 or individually referred to as a network entity 102.
[0069] A network entity 102 may provide a geographic coverage area 112 for which the network entity 102 may support services (e.g., voice, video, packet data, messaging, broadcast, etc. ) for one or more UEs 104 within the geographic coverage area 112. For example, a network entity 102 and a UE 104 may support wireless communication of signals related to services (e.g., voice, video, packet data, messaging, broadcast, etc. ) according to one or multiple radio access technologies. In some implementations, a network entity 102 may be moveable, for example, a satellite associated with a non-terrestrial network. In some implementations, different geographic coverage areas 112 associated with the same or different radio access technologies may overlap, but the different geographic coverage areas 112 may be associated with different network entities 102. Information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
[0070] The one or more UEs 104 may be dispersed throughout a geographic region of the wireless communications system 100. A UE 104 may include or may be referred to as a mobile device, a wireless device, a remote device, a remote unit, a handheld device, or a subscriber device, or some other suitable terminology. In some implementations, the UE 104 may be referred to as a unit, a station, a terminal, or a client, among other examples. Additionally, or alternatively, the UE 104 may be referred to as an internet-of-things (IoT) device, an internet-of-everything (IoE) device, or machine-type communication (MTC) device, among other examples. In some implementations, a UE 104 may be stationary in the wireless communications system 100. In some other implementations, a UE 104 may be mobile in the wireless communications system 100.
[0071] The one or more UEs 104 may be devices in different forms or having different capabilities. Some examples of UEs 104 are illustrated in Fig. 1. A UE 104 may be capable of communicating with various types of devices, such as the network entities 102, other UEs 104, or network equipment (e.g., the core network 106, the packet data network 108, a relay device, an integrated access and backhaul (IAB) node, or another network equipment) , as shown in Fig. 1. Additionally, or alternatively, a UE 104 may support communication with other network entities 102 or UEs 104, which may act as relays in the wireless communications system 100.
[0072] A UE 104 may also be able to support wireless communication directly with other UEs 104 over a communication link 114. For example, a UE 104 may support wireless communication directly with another UE 104 over a device-to-device (D2D) communication link. In some implementations, such as vehicle-to-vehicle (V2V) deployments, vehicle-to-everything (V2X) deployments, or cellular-V2X deployments, the communication link 114 may be referred to as a sidelink. For example, a UE 104 may support wireless communication directly with another UE 104 over a PC5 interface.
[0073] A network entity 102 may support communications with the core network 106, or with another network entity 102, or both. For example, a network entity 102 may interface with the core network 106 through one or more backhaul links 116 (e.g., via an S1, N2, N2, or another network interface) . The network entities 102 may communicate with each other over the backhaul links 116 (e.g., via an X2, Xn, or another network interface) . In some implementations, the network entities 102 may communicate with each other directly (e.g., between the network entities 102) . In some other implementations, the network entities 102 may communicate with each other or indirectly (e.g., via the core network 106) . In some implementations, one or more network entities 102 may include subcomponents, such as an access network entity, which may be an example of an access node controller (ANC) . An ANC may communicate with the one or more UEs 104 through one or more other access network transmission entities, which may be referred to as a radio heads, smart radio heads, or transmission-reception points (TRPs) .
[0074] In some implementations, a network entity 102 may be configured in a disaggregated architecture, which may be configured to utilize a protocol stack physically or logically distributed among two or more network entities 102, such as an integrated access backhaul (IAB) network, an open radio access network (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance) , or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN) ) . For example, a network entity 102 may include one or more of a central unit (CU) , a distributed unit (DU) , a radio unit (RU) , a RAN intelligent controller (RIC) (e.g., a near-real time RIC (Near-RT RIC) , a non-real time RIC (Non-RT RIC) ) , a service management and orchestration (SMO) system, or any combination thereof.
[0075] An RU may also be referred to as a radio head, a smart radio head, a remote radio head (RRH) , a remote radio unit (RRU) , or a transmission reception point (TRP) . One or more components of the network entities 102 in a disaggregated RAN architecture may be co-located, or one or more components of the network entities 102 may be located in distributed locations (e.g., separate physical locations) . In some implementations, one or more network entities 102 of a disaggregated RAN architecture may be implemented as virtual units (e.g., a virtual CU (VCU) , a virtual DU (VDU) , a virtual RU (VRU) ) .
[0076] Split of functionality between a CU, a DU, and an RU may be flexible and may support different functionalities depending upon which functions (e.g., network layer functions, protocol layer functions, baseband functions, radio frequency functions, and any combinations thereof) are performed at a CU, a DU, or an RU. For example, a functional split of a protocol stack may be employed between a CU and a DU such that the CU may support one or more layers of the protocol stack and the DU may support one or more different layers of the protocol stack. In some implementations, the CU may host upper protocol layer (e.g., a layer 3 (L3) , a layer 2 (L2) ) functionality and signaling (e.g., radio resource control (RRC) , service data adaption protocol (SDAP) , packet data convergence protocol (PDCP) ) . The CU may be connected to one or more DUs or RUs, and the one or more DUs or RUs may host lower protocol layers, such as a layer 1 (L1) (e.g., physical (PHY) layer) or an L2 (e.g., medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU.
[0077] Additionally, or alternatively, a functional split of the protocol stack may be employed between a DU and an RU such that the DU may support one or more layers of the protocol stack and the RU may support one or more different layers of the protocol stack. The DU may support one or multiple different cells (e.g., via one or more RUs) . In some implementations, a functional split between a CU and a DU, or between a DU and an RU may be within a protocol layer (e.g., some functions for a protocol layer may be performed by one of a CU, a DU, or an RU, while other functions of the protocol layer are performed by a different one of the CU, the DU, or the RU) .
[0078] A CU may be functionally split further into CU control plane (CU-CP) and CU user plane (CU-UP) functions. A CU may be connected to one or more DUs via a midhaul communication link (e.g., F1, F1-c, F1-u) , and a DU may be connected to one or more RUs via a fronthaul communication link (e.g., open fronthaul (FH) interface) . In some implementations, a midhaul communication link or a fronthaul communication link may be implemented in accordance with an interface (e.g., a channel) between layers of a protocol stack supported by respective network entities 102 that are in communication via such communication links.
[0079] The core network 106 may support user authentication, access authorization, tracking, connectivity, and other access, routing, or mobility functions. The core network 106 may be an evolved packet core (EPC) , or a 5G core (5GC) , which may include a control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management functions (AMF) ) and a user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a packet data network (PDN) gateway (P-GW) , or a user plane function (UPF) ) . In some implementations, the control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management (e.g., data bearers, signal bearers, etc. ) for the one or more UEs 104 served by the one or more network entities 102 associated with the core network 106.
[0080] The core network 106 may communicate with the packet data network 108 over one or more backhaul links 116 (e.g., via an S1, N2, N2, or another network interface) . The packet data network 108 may include an application server 118. In some implementations, one or more UEs 104 may communicate with the application server 118. A UE 104 may establish a session (e.g., a protocol data unit (PDU) session, or the like) with the core network 106 via a network entity 102. The core network 106 may route traffic (e.g., control information, data, and the like) between the UE 104 and the application server 118 using the established session (e.g., the established PDU session) . The PDU session may be an example of a logical connection between the UE 104 and the core network 106 (e.g., one or more network functions of the core network 106) .
[0081] In the wireless communications system 100, the network entities 102 and the UEs 104 may use resources of the wireless communications system 100 (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers) ) to perform various operations (e.g., wireless communications) . In some implementations, the network entities 102 and the UEs 104 may support different resource structures. For example, the network entities 102 and the UEs 104 may support different frame structures. In some implementations, such as in 4G, the network entities 102 and the UEs 104 may support a single frame structure. In some other implementations, such as in 5G and among other suitable radio access technologies, the network entities 102 and the UEs 104 may support various frame structures (i.e., multiple frame structures) . The network entities 102 and the UEs 104 may support various frame structures based on one or more numerologies.
[0082] One or more numerologies may be supported in the wireless communications system 100, and a numerology may include a subcarrier spacing and a cyclic prefix. A first numerology (e.g., μ=0) may be associated with a first subcarrier spacing (e.g., 15 kHz) and a normal cyclic prefix. In some implementations, the first numerology (e.g., μ=0) associated with the first subcarrier spacing (e.g., 15 kHz) may utilize one slot per subframe. A second numerology (e.g., μ=1) may be associated with a second subcarrier spacing (e.g., 30 kHz) and a normal cyclic prefix. A third numerology (e.g., μ=2) may be associated with a third subcarrier spacing (e.g., 60 kHz) and a normal cyclic prefix or an extended cyclic prefix. A fourth numerology (e.g., μ=3) may be associated with a fourth subcarrier spacing (e.g., 120 kHz) and a normal cyclic prefix. A fifth numerology (e.g., μ=4) may be associated with a fifth subcarrier spacing (e.g., 240 kHz) and a normal cyclic prefix.
[0083] A time interval of a resource (e.g., a communication resource) may be organized according to frames (also referred to as radio frames) . Each frame may have a duration, for example, a 10 millisecond (ms) duration. In some implementations, each frame may include multiple subframes. For example, each frame may include 10 subframes, and each subframe may have a duration, for example, a 1 ms duration. In some implementations, each frame may have the same duration. In some implementations, each subframe of a frame may have the same duration.
[0084] Additionally or alternatively, a time interval of a resource (e.g., a communication resource) may be organized according to slots. For example, a subframe may include a number (e.g., quantity) of slots. The number of slots in each subframe may also depend on the one or more numerologies supported in the wireless communications system 100. For instance, the first, second, third, fourth, and fifth numerologies (i.e., μ=0, μ=1, μ=2, μ=3, μ=4) associated with respective subcarrier spacings of 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz may utilize a single slot per subframe, two slots per subframe, four slots per subframe, eight slots per subframe, and 16 slots per subframe, respectively. Each slot may include a number (e.g., quantity) of symbols (e.g., OFDM symbols) . In some implementations, the number (e.g., quantity) of slots for a subframe may depend on a numerology. For a normal cyclic prefix, a slot may include 14 symbols. For an extended cyclic prefix (e.g., applicable for 60 kHz subcarrier spacing) , a slot may include 12 symbols. The relationship between the number of symbols per slot, the number of slots per subframe, and the number of slots per frame for a normal cyclic prefix and an extended cyclic prefix may depend on a numerology. It should be understood that reference to a first numerology (e.g., μ=0) associated with a first subcarrier spacing (e.g., 15 kHz) may be used interchangeably between subframes and slots.
[0085] In the wireless communications system 100, an electromagnetic (EM) spectrum may be split, based on frequency or wavelength, into various classes, frequency bands, frequency channels, etc. By way of example, the wireless communications system 100 may support one or multiple operating frequency bands, such as frequency range designations FR1 (410 MHz –7.125 GHz) , FR2 (24.25 GHz –52.6 GHz) , FR3 (7.125 GHz –24.25 GHz) , FR4 (52.6 GHz –114.25 GHz) , FR4a or FR4-1 (52.6 GHz –71 GHz) , and FR5 (114.25 GHz –300 GHz) . In some implementations, the network entities 102 and the UEs 104 may perform wireless communications over one or more of the operating frequency bands. In some implementations, FR1 may be used by the network entities 102 and the UEs 104, among other equipment or devices for cellular communications traffic (e.g., control information, data) . In some implementations, FR2 may be used by the network entities 102 and the UEs 104, among other equipment or devices for short-range, high data rate capabilities.
[0086] FR1 may be associated with one or multiple numerologies (e.g., at least three numerologies) . For example, FR1 may be associated with a first numerology (e.g., μ=0) , which includes 15 kHz subcarrier spacing; a second numerology (e.g., μ=1) , which includes 30 kHz subcarrier spacing; and a third numerology (e.g., μ=2) , which includes 60 kHz subcarrier spacing. FR2 may be associated with one or multiple numerologies (e.g., at least 2 numerologies) . For example, FR2 may be associated with a third numerology (e.g., μ=2) , which includes 60 kHz subcarrier spacing; and a fourth numerology (e.g., μ=3) , which includes 120 kHz subcarrier spacing.
[0087] Fig. 2 illustrates another example of a wireless communications system 200 that supports segmentation at a PDCP entity for data transmission in accordance with aspects of the present disclosure. As shown in Fig. 2, the wireless communications system 200 may comprise a first device 210 for wireless communication and a second device 220 for wireless communication.
[0088] In some implementations, the first device 210 may be implemented as a transmitter of a data packet and the second device 220 may be implemented as a receiver of the data packet. For example, the first device 210 may be implemented as a TX PDCP entity of the data packet and the second device 220 may be implemented as a receiving (RX) PDCP entity of the data packet.
[0089] In some implementations, the first device 210 may be implemented as the network entity 102 in Fig. 1 and the second device 220 may be implemented as the UE 104 in Fig. 1. Alternatively, the first device 210 may be implemented as the UE 104 in Fig. 1 and the second device 220 may be implemented as the network entity 102 in Fig. 1.
[0090] Fig. 3 illustrates another example of a wireless communications system 300 that supports segmentation at a PDCP entity for data transmission in accordance with aspects of the present disclosure. The wireless communications system 300 may be considered as an example implementation of the wireless communications system 200.
[0091] As shown in Fig. 3, the wireless communications system 300 may comprise the first device 210 and the second device 220.
[0092] In some implementations, the first device 210 may comprise an SDAP entity 212, a PDCP entity 214, a MAC entity 216 and a PHY entity 218, and the second device 220 may comprise an SDAP entity 222, a PDCP entity 224, a MAC entity 226 and a PHY entity 228.
[0093] In some implementations, the PDCP entity 214 may be implemented as a TX PDCP entity, and the PDCP entity 224 may be implemented as an RX PDCP entity. In such implementations, the PDCP entity 214 may be configured to support segmentation of a PDCP SDU and the PDCP entity 224 may be configured to support reassembly of the PDCP SDU.
[0094] Alternatively, in some implementations, the PDCP entity 224 may be implemented as a TX PDCP entity, and the PDCP entity 214 may be implemented as an RX PDCP entity. In such implementations, the PDCP entity 224 may be configured to support segmentation of a PDCP SDU and the PDCP entity 214 may be configured to support reassembly of the PDCP SDU.
[0095] In some implementations, an entity or layer of the first device 210 supporting segmentation of a PDCP SDU may be named in other way. For example, an entity or layer of the first device 210 supporting segmentation of a PDCP SDU may be named as a new entity or layer. Similarly, an entity or layer of the second device 220 supporting reassembly of a PDCP SDU may be named in other way. For example, an entity or layer of the second device 220 supporting reassembly of a PDCP SDU may be named as a new entity or layer. The scope of the present disclosure is not limited in this regard.
[0096] Fig. 4 illustrates a signaling diagram illustrating an example process 400 that supports segmentation at a PDCP entity for data transmission in accordance with aspects of the present disclosure. The process 400 may involve the first device 210 for wireless communication and the second device 220 for wireless communication in Fig. 2 or 3. For the purpose of discussion, the process 400 will be described with reference to Fig. 2 or 3.
[0097] Generally, in the process 400, the first device 210 may be implemented as a transmitter of a data packet and the second device 220 may be implemented as a receiver of the data packet. For example, the first device 210 may be implemented as a TX PDCP entity of the data packet and the second device 220 may be implemented as a receiving (RX) PDCP entity of the data packet.
[0098] As shown in Fig. 4, the first device 210 performs 410, at a PDCP entity of the first device 210, segmentation of a PDCP SDU or a portion comprising the PDCP SDU and a message authentication code for integrity (MAC-I) associated with the PDCP SDU to generate a segment.
[0099] In some implementations, the PDCP entity 214 of the first device 210 may be configured for an RB supporting segmentation. In some implementations, the first device 210 may receive a configuration for the segmentation from the second device 220. The first device 210 may perform the segmentation of the PDCP SDU based on the configuration. For example, the first device 210 may receive a radio bearer configuration from the second device 220. The radio bearer configuration may explicitly or implicitly indicate whether to use segmentation function. For example, if the radio bearer is configured as acknowledge mode or un-acknowledge mode, it is implicitly indicated to use segmentation function. For example, if the radio bearer is configured as transparent mode, it is implicitly indicated not to use segmentation function.
[0100] In turn, the first device 210 transmits 420 a PDU including the segment to the second device 220. Accordingly, the second device 220 receive the PDU including the PDCP SDU segment from the first device 210. The PDCP PDU comprises information related to segmentation of the PDCP SDU.
[0101] Then, based on PDCP SDU segments and the information related to segmentation, the second device 220 reassembles 430 the PDCP SDU at a PDCP entity of the second device 220.
[0102] With the process 400, segmentation of a PDCP SDU can be performed at a PDCP entity instead of RLC entity of the first device 210, and thus implementation of the first device 210 may be simplified. Reassembly of the PDCP SDU can be performed at a PDCP entity instead of RLC entity of the second device 220, and thus implementation of the first device 210 may be simplified.
[0103] Hereinafter, some implementations of segmentation of a PDCP SDU will be described with reference to Figs. 5 to 9.
[0104] In some implementations, the first device 210 may further perform at least one of the following for the PDCP SDU: integrity protection or ciphering. In other words, the first device 210 may further perform integrity protection and / or ciphering for the PDCP SDU. After integrity protection and / or ciphering, the first device 210 may perform segmentation of a PDCP SDU. This will be described with reference to Figs. 5 and 6.
[0105] Fig. 5 illustrates a signaling diagram illustrating an example process 500 that supports segmentation at a PDCP entity for data transmission in accordance with aspects of the present disclosure. The process 500 may be considered as an example implementation of the process 400. The process 500 may involve the TX PDCP entity 214 of the first device 210 for wireless communication and the RX PDCP entity 224 of the second device 220 for wireless communication in Fig. 3. For the purpose of discussion, the process 500 will be described with reference to Fig. 3.
[0106] As shown in Fig. 5, at 510, the TX PDCP entity 214 receives a PDCP SDU from an upper layer and assigns a PDCP SN for the PDCP SDU.
[0107] In some implementations, the TX PDCP entity 214 may assign a single SN for PDCP SDU segments if a PDCP SDU is segmented. In other words, the TX PDCP entity 214 may assign only one unified SN for any segmentation portion of a PDCP SDU if the PDCP SDU is segmented.
[0108] Alternatively, in some implementations, the TX PDCP entity 214 may assign a unique SN for each of PDCP SDU segments if a PDCP SDU is segmented. In such implementations, the TX PDCP entity 214 may assign different SNs for different PDCP SDU segments if a PDCP SDU is segmented.
[0109] At 515, the TX PDCP entity 214 may perform IP header compression if configured.
[0110] At 520, the TX PDCP entity 214 may perform integrity protection for the PDCP SDU if configured. Alternatively, the first device 210 may perform integrity protection for the PDCP SDU and a portion of a PDCP header of the PDCP PDU. The portion of PDCP header excludes the information related to segmentation. For example, the portion of the PDCP header includes at least one of : PDCP SN field, field indicating whether the corresponding PDCP PDU is a PDCP Data PDU or a PDCP Control PDU.
[0111] In some implementations, the first device 210 may perform integrity protection for a portion of the PDCP PDU excluding the information related to segmentation. That is to say, the information related to segmentation is not performed integrity protection.
[0112] In some implementations, the information related to segmentation may comprise a first indication. The first indication indicates whether the PDCP PDU contains a complete PDCP SDU or contains a start, middle or end segment of the PDCP SDU.
[0113] In some implementations, the PDCP service data unit (SDU) segment may be replaced by the segment of a portion comprising the PDCP SDU and MAC-I associated with the PDCP SDU.
[0114] In some implementations, the PDCP SDU segments may be replaced by the segments of a portion comprising the PDCP SDU and MAC-I.
[0115] In some implementations, the information related to segmentation may comprise a first indication. The first indication indicates whether the PDCP PDU contains a complete PDCP SDU and MAC-I or contains a start, middle or end segment of a portion comprising a portion comprising the PDCP SDU and MAC-I.
[0116] In some implementations, the PDCP PDU may comprise a PDCP header, and the PDCP header may comprise the information related to segmentation. In such implementations, the data unit that is integrity protected is the PDCP header excluding the information related to segmentation and the data part of the PDCP PDU comprising PDCP SDU.
[0117] In some implementations, for a PDCP SDU received from upper layers, the TX PDCP entity 214 associates a COUNT value corresponding to a PDCP SN and Hyper Frame Number to this PDCP SDU or this PDCP SDU segment. The required inputs to the integrity protection function may comprise the COUNT value, and DIRECTION (direction of the transmission) . The parameters required by the TX PDCP entity 214 which are provided by upper layers are listed below: -BEARER (defined as the radio bearer identifier. It will use the value RB identity –1) ; and -KEY (the integrity protection keys for the control plane and for the user plane are KRRCint and KUPint, respectively) .
[0118] In some implementations, the TX PDCP entity 214 may apply a PDCP SN for a PDCP SDU segment as a parameter for integrity protection and / or ciphering.
[0119] Alternatively, in some implementations, the data part of the PDCP PDU (e.g., the PDCP SDU) may comprise the information related to segmentation. In such implementations, the data unit that is integrity protected is the PDCP header and the data part of the PDCP PDU excluding the information related to segmentation before ciphering.
[0120] In such implementations, the information related to segmentation may comprise a second indication. The second indication may indicate a position of the PDCP SDU segment in bytes within a portion comprising the ciphered PDCP SDU.
[0121] In some implementations, the TX PDCP entity 214 may perform integrity protection for the PDCP SDU to generate a message authentication code for integrity (MAC-I) associated with the PDCP SDU.
[0122] In some implementations, the TX PDCP entity 214 may use the information related to segmentation as input for integrity protection for the PDCP SDU.
[0123] In some implementations, the first device 210 may receive a configuration for the integrity protection or ciphering from the second device 220. The PDCP configuration indicates whether to use the information related to segmentation as input for at least one of the following for the PDCP SDU: integrity protection or ciphering.
[0124] At 525, the TX PDCP entity 214 may perform ciphering if configured.
[0125] For example, the data unit that is ciphered is the MAC-I and the data part of the PDCP Data PDU except the SDAP header and the SDAP Control PDU if included in the PDCP SDU.
[0126] Additionally, if the data part of the PDCP Data PDU comprises the information related to segmentation, the information related to segmentation is not ciphered. The required inputs to the ciphering function may comprise the COUNT value, and DIRECTION (direction of the transmission) . The parameters required by the TX PDCP entity 214 which are provided by upper layers are listed below. -BEARER (defined as the radio bearer identifier. It will use the value RB identity –1) ; -KEY (the ciphering keys for the control plane and for the user plane are KRRCenc and KUPenc, respectively) .
[0127] In some implementations, the TX PDCP entity 214 may use the information related to segmentation as input for ciphering for the PDCP SDU.
[0128] At 530, the TX PDCP entity 214 may perform segmentation of a PDCP SDU if needed.
[0129] In some implementations, the first device 210 may not perform integrity protection for a PDCP SDU, but perform ciphering for the PDCP SDU to generate the ciphered PDCP SDU. The first device 210 may perform segmentation of the ciphered PDCP SDU.
[0130] Alternatively, in some implementations, the first device 210 may perform integrity protection for the PDCP SDU to generate the MAC-I and perform ciphering for the PDCP SDU to generate a ciphered PDCP SDU. In turn, the first device 210 may perform segmentation of the ciphered PDCP SDU and the MAC-I
[0131] In such implementations, the information related to segmentation may comprise a second indication. The second indication may indicate a position of a PDCP SDU segment in bytes within a portion comprising the PDCP SDU plus the MAC-I.
[0132] In some implementations, the first device 210 may perform integrity protection for the PDCP SDU to generate the MAC-I. The first device 210 may perform segmentation of the PDCP SDU plus the MAC-I.
[0133] In such implementations, the information related to segmentation may comprise a second indication. The second indication may indicate a position of a PDCP SDU segment in bytes within a portion comprising the PDCP SDU and the MAC-I.
[0134] In some implementations, the first device 210 may not perform ciphering for the PDCP SDU. In such implementations, the first device 210 may perform segmentation of the PDCP SDU without ciphering.
[0135] In such implementations, the information related to segmentation may comprise a second indication. The second indication may indicate a position of a PDCP SDU segment in bytes within a portion comprising the PDCP SDU.
[0136] In some implementations, the PDCP PDU may comprise a third indication indicating whether the information related to segmentation is integrity protected. For example, the third indication may indicate whether the SI field and / or SO field are integrity protected.
[0137] In some implementations, the PDCP PDU may comprise a PDCP header and a data part. For example, the PDCP header may comprise the third indication. For another example, the data part may comprise the third indication.
[0138] In some implementations, the first device 210 may receive a PDCP configuration from the second device 220. The PDCP configuration indicates whether the information related to segmentation is to be integrity protected.
[0139] In some implementations, when the TX PDCP entity 214 is notified of a transmission opportunity by the lower layer, the TX PDCP entity 214 may perform segmentation of PDCP SDUs, if needed, so that the corresponding PDCP PDUs with PDCP headers, fit within the total size of PDCP PDU (s) indicated by lower layer.
[0140] At 535, the TX PDCP entity 214 adds or generates a PDCP header. Additionally, the TX PDCP entity 214 forms a PDCP PDU.
[0141] At 540, the TX PDCP entity 214 routes the PDCP PDU to lower layer for transmission. The TX PDCP entity 214 may form a PDCP PDU before routing.
[0142] In turn, the first device 210 may transmit the PDCP PDU including a PDCP SDU segment to the second device 220 via a radio interface. The PDCP PDU comprises information related to segmentation.
[0143] At 545, the RX PDCP entity 224 receives a PDCP PDU from lower layer and removes a PDCP header.
[0144] At 550, the RX PDCP entity 224 reassembles a PDCP SDU from the received PDCP PDU.
[0145] For example, if the PDCP SDU is segmented into more than one PDCP SDU segments, the RX PDCP entity 224 reassembles the PDCP SDU based on PDCP SDU segments and the information related to segmentation.
[0146] At 555, the RX PDCP entity 224 performs deciphering for a ciphered PDCP SDU. For example, after the RX PDCP entity 224 reassembles the PDCP SDU, the RX PDCP entity 224 performs deciphering for a ciphered PDCP SDU.
[0147] In some implementations, the RX PDCP entity 224 may perform deciphering for a portion of the PDCP PDU excluding the information related to segmentation. For example, if the information related to segmentation is included in data part of the PDCP PDU, the RX PDCP entity 224 may perform deciphering for data part of the PDCP PDU excluding the information related to segmentation. For example, if the information related to segmentation is included in data part of the PDCP PDU, the RX PDCP entity 224 may perform deciphering for data part of the PDCP PDU excluding the SDAP header and SDAP control PDU related to segmentation.
[0148] In some implementations, the RX PDCP entity 224 may use the information related to segmentation as input for deciphering for the PDCP SDU.
[0149] Alternatively, in some implementations, the RX PDCP entity 224 may perform deciphering for a portion of the PDCP PDU including the information related to segmentation.
[0150] In some implementations, the RX PDCP entity 224 may use the information related to segmentation as input for deciphering for the PDCP SDU.
[0151] In some implementations, the second device 220 may receive a configuration for the integrity verification or deciphering from the first device 210. The PDCP configuration indicates whether to use the information related to the segmentation as input for at least one of the following for the PDCP SDU: integrity verification or deciphering.
[0152] In some implementations, the PDCP PDU comprising the information related to segmentation may comprise the first indication. The first indication indicates whether the PDCP PDU contains a complete PDCP SDU or contains a start, middle or end segment of the PDCP SDU.
[0153] In some implementations, the PDCP PDU comprising the information related to segmentation may comprise the first indication. The first indication indicates whether the PDCP PDU contains a complete PDCP SDU and MAC-I or contains a start, middle or end segment of a portion comprising the PDCP SDU and MAC-I.
[0154] In some implementations, the first indication may be excluded from deciphering.
[0155] In some implementations, the PDCP PDU comprising the information related to segmentation may comprise a second indication. The second indication indicates a position of the PDCP SDU segment in bytes within a portion comprising the ciphered PDCP SDU.
[0156] In some implementations, the second indication may be excluded from deciphering.
[0157] In some implementations, at least one of the first indication and the second indication may be excluded from deciphering.
[0158] At 560, the RX PDCP entity 224 performs integrity verification for integrity protected PDCP SDU.
[0159] In some implementations, the RX PDCP entity 224 may perform integrity verification for the PDCP SDU. For example, after the RX PDCP entity 224 reassembles the PDCP SDU, the RX PDCP entity 224 performs integrity verification for integrity protected PDCP SDU.
[0160] In some implementations, the RX PDCP entity 224 may perform integrity verification for the PDCP SDU and a portion of PDCP header of the PDCP PDU. The portion of PDCP header of the PDCP PDU excludes the information related to segmentation.
[0161] In some implementations, the RX PDCP entity 224 may perform integrity verification for the PDCP SDU and a portion of data part of the PDCP PDU. The portion of data part of the PDCP PDU excludes the information related to segmentation.
[0162] In some implementations, the RX PDCP entity 224 may perform integrity verification for a portion of the PDCP PDU excluding the information related to segmentation.
[0163] In some implementations, the RX PDCP entity 224 may perform integrity verification for the PDCP PDU including the information related to segmentation.
[0164] In some implementations, the PDCP PDU may comprise a third indication indicating whether the information related to segmentation is integrity protected. For example, the third indication may indicate whether the SI field and / or SO field are integrity protected.
[0165] In some implementations, if the third indication indicates that the information related to segmentation is integrity protected, the RX PDCP entity 224 may perform integrity verification for a portion of the PDCP PDU including the information related to segmentation. If the third indication indicates that the information related to segmentation is not integrity protected, the RX PDCP entity 224 may perform integrity verification for a portion of the PDCP PDU excluding the information related to segmentation. The RX PDCP entity 224 may perform integrity verification for the third indication.
[0166] In some implementations, the RX PDCP entity 224 may use the information related to segmentation as input for integrity verification for the PDCP SDU.
[0167] Alternatively, the RX PDCP entity 224 may use the information related to segmentation as input for integrity verification for the PDCP SDU and a portion of the PDCP header of the PDCP PDU. The portion of the PDCP header of the PDCP PDU may exclude the information related to segmentation.
[0168] In some implementations, if the third indication indicates that the information related to segmentation is integrity protected, the RX PDCP entity 224 may use the information related to segmentation as input for integrity verification for the PDCP SDU.
[0169] In some implementations, the PDCP PDU comprising the information related to segmentation may comprise the first indication. The first indication indicates whether the PDCP PDU contains a complete PDCP SDU or contains a start, middle or end segment of the PDCP SDU.
[0170] In some implementations, the PDCP PDU comprising the information related to segmentation may comprise the first indication. The first indication indicates whether the PDCP PDU contains a complete PDCP SDU and MAC-I or contains a start, middle or end segment of a portion comprising the PDCP SDU and MAC-I.
[0171] In some implementations, the first indication may be excluded from integrity verification.
[0172] In some implementations, the PDCP PDU comprising the information related to segmentation may comprise a second indication. The second indication indicates a position of the PDCP SDU segment in bytes within a portion comprising the ciphered PDCP SDU.
[0173] In some implementations, the second indication may be excluded from integrity verification.
[0174] In some implementations, at least one of the first indication and the second indication may be excluded from integrity verification.
[0175] At 565, the RX PDCP entity 224 performs reordering and duplicate discarding.
[0176] At 570, the RX PDCP entity 224 performs decompression for compressed PDCP SDU.
[0177] Figs. 6 and 7 illustrate an example of a PDCP PDU in accordance with aspects of the present disclosure, respectively. In the example of Fig. 6, a PDCP SN is 12 bits length. In the example of Fig. 7, a PDCP SN is 18 bits length.
[0178] In the examples of Figs. 6 and 7, the PDCP PDU comprises a PDCP header and a PDCP SDU field. The PDCP header is associated with the PDCP SDU.
[0179] In some implementations, the PDCP header may comprise at least one of the following fields: a first field, a second field, a third field, a fourth field, a fifth field or a sixth field.
[0180] In some implementations, the first field indicates whether the corresponding PDCP PDU is a PDCP Data PDU or a PDCP Control PDU. For example, the first field may be a D / C field as shown in Figs. 6 and 7.
[0181] In some implementations, the second field indicates whether a PDCP PDU contains a complete PDCP SDU or a start (i.e., the first) , middle, end (i.e., last) segment of a PDCP SDU. For example, the second field may be an SI field. The SI field may comprise the first indication as described above.
[0182] In some implementations, the second field indicates whether a PDCP PDU contains a complete PDCP SDU and MAC-I or a start (i.e., the first) , middle, end (i.e., last) segment of a portion comprising the PDCP SDU and MAC-I.
[0183] In some implementations, the third field indicates a PDCP SN.
[0184] In some implementations, the fourth field may be an SO field as shown in Figs. 6 and 7. The SO field may comprise the second indication as described above.
[0185] For example, the SO field may indicate a position of the segment in bytes within a portion. It may indicate the position within a portion including the segment to which the first byte of the segment in the Data field corresponds.
[0186] For example, the SO field may indicate a position of the segment in bytes within a portion. It may indicate the position within a portion including the PDCP SDU and MAC-I if present, to which the first byte of the segment in the Data field corresponds.
[0187] For example, if integrity protection is performed, the portion comprises the data part (e.g., PDCP SDU) of the PDCP PDU and MAC-I.
[0188] For example, if integrity protection is not performed, the portion comprises the data part (e.g., PDCP SDU) of the PDCP PDU.
[0189] For example, if ciphering is performed, the data partis the ciphered PDCP SDU, otherwise it is the not ciphered PDCP SDU.
[0190] In some implementations, the fifth field includes PDCP SDU or PDCP SDU segment. For example, the fifth field may be a Data field as shown in Figs. 6 and 7.
[0191] In some implementations, the sixth field carries a message authentication code calculated. For example, the sixth field may be a MAC-I field as shown in Figs. 6 and 7.
[0192] Fig. 8 illustrates a signaling diagram illustrating an example process 800 that supports segmentation at a PDCP entity for data transmission in accordance with aspects of the present disclosure. The process 800 may be considered as an example implementation of the process 400. The process 800 may involve the TX PDCP entity 214 of the first device 210 for wireless communication and the RX PDCP entity 224 of the second device 220 for wireless communication in Fig. 3. For the purpose of discussion, the process 800 will be described with reference to Fig. 3.
[0193] Generally, in the process 800, the TX PDCP entity 214 performs segmentation of a PDCP SDU after a PDCP PDU has been formed or after a PDCP header has been generated. For example, the TX PDCP entity 214 needs to form new PDCP PDU based on a segment and another PDCP header. The segment may be a PDCP SDU segment or a segment of a portion comprising the PDCP SDU and MAC-I.
[0194] As shown in Fig. 8, at 810, the TX PDCP entity 214 receives a PDCP SDU from an upper layer and assigns a PDCP SN for the PDCP SDU.
[0195] In some implementations, the TX PDCP entity 214 may assign a single SN for PDCP SDU segments if a PDCP SDU is segmented. In other words, the TX PDCP entity 214 may assign only one unified SN for any segmentation portion of a PDCP SDU if the PDCP SDU is segmented.
[0196] Alternatively, in some implementations, the TX PDCP entity 214 may assign a unique SN for each of PDCP SDU segments if a PDCP SDU or a portion comprising the PDCP SDU and MAC-I is segmented. In such implementations, the TX PDCP entity 214 may assign different SNs for different PDCP SDU segments if a PDCP SDU is segmented.
[0197] At 815, the TX PDCP entity 214 may perform IP header compression if configured.
[0198] At 820, the TX PDCP entity 214 may perform integrity protection for the PDCP SDU if configured.
[0199] In some implementations, the information related to segmentation may comprise a first indication. The first indication indicates whether the PDCP PDU contains a complete PDCP SDU or contains a start, middle or end segment of the PDCP SDU.
[0200] In some implementations, the information related to segmentation may comprise a first indication. The first indication indicates whether the PDCP PDU contains a complete PDCP SDU and MAC-I or contains a start, middle or end segment of the a portion comprising the PDCP SDU and MAC-I.
[0201] Additionally or alternatively, the information related to segmentation may comprise a second indication. For example, the second indication may indicate a position of the data part in the PDCP PDU in bytes within the PDCP SDU associated with the PDCP PDU or within the a portion comprising the PDCP SDU and MAC-I.. In some implementations, the PDCP PDU may comprise a PDCP header, and the PDCP header may comprise the information related to segmentation.
[0202] In some implementations, the first device 210 may perform integrity protection for the PDCP SDU and a portion of a PDCP header of the PDCP PDU. The portion of PDCP header excludes the information related to segmentation. In such implementations, the data unit that is integrity protected is the PDCP SDUand the PDCP header excluding the information related to segmentation before ciphering.
[0203] In some implementations, the first device 210 may perform integrity protection for the PDCP SDU and a portion of a PDCP header excluding the first indication (i.e., the SI field) and the second indication (e.g., SO field) .
[0204] In some implementations, the TX PDCP entity 214 may perform integrity protection for the PDCP SDU to generate a MAC-I associated with the PDCP SDU.
[0205] At 825, the TX PDCP entity 214 may perform ciphering if configured.
[0206] For example, the data unit that is ciphered is the MAC-I and the data part of the PDCP Data PDU except the SDAP header and the SDAP Control PDU if included in the PDCP SDU.
[0207] At 830, the TX PDCP entity 214 adds a PDCP header to form a PDCP PDU. Alternatively, the TX PDCP entity 214 generates the PDCP header.
[0208] At 835, the TX PDCP entity 214 may perform segmentation of a PDCP SDU plus the MAC-I if present and if needed. The TX PDCP entity 214 may also generate PDCP header to form a new PDCP PDU for the segment.
[0209] In some implementations, the TX PDCP entity 214 may update the first indication (i.e., the SI field) and the second indication (e.g., SO field) in the PDCP header after segmentation.
[0210] In some implementations, the PDCP SDU segmentation is performed after PDCP header and PDCP SDU is stored in PDCP transmission buffer, i.e. the PDCP PDU is pending for transmission or retransmission. Alternatively, the PDCP SDU segmentation is performed after PDCP PDU including PDCP header and PDCP DU is stored in PDCP transmission buffer.
[0211] Alternatively, in some implementations, when the TX PDCP entity 214 is notified of a transmission opportunity by the lower layer, the TX PDCP entity 214 may perform segmentation of the PDCP SDUs or the portion comprising the PDCP SDU and MAC-I and forms new PDCP PDUs, if needed, so that the corresponding PDCP PDUs with PDCP headers, fit within the total size of PDCP PDU (s) indicated by lower layer.
[0212] At 840, the TX PDCP entity 214 routes the PDCP PDU to lower layer for transmission.
[0213] In turn, the first device 210 may transmit the PDCP PDU including a segment to the second device 220 via a radio interface. The PDCP PDU comprises information related to segmentation.
[0214] The actions 545, 550, 555, 560, 565 and 570 in the process 800 are the same as those in the process 500. Details of these actions are omitted for brevity.
[0215] In some implementations, the TX PDCP entity 214 may perform re-segmentation of a segment of a PDCP SDU or a portion comprising the PDCP SDU and MAC-I after a PDCP PDU including a segment has been formed.
[0216] In such implementations, the TX PDCP entity 214 may perform re-segmentation of the segment if a buffered segment is needed to re-segment and generate / update a PDCP header to form a PDCP PDU for the new segment. For example, the TX PDCP entity 214 may update the SI field and SO field in a PDCP header after re-segmentation.
[0217] In some implementations, the re-segmentation is performed after PDCP PDU including a segment is stored in a PDCP transmission buffer, i.e. the PDCP PDU is pending for transmission.
[0218] Alternatively, in some implementations, the PDCP SDU re-segmentation is performed after a segment has been routed to lower layer and is stored in a PDCP retransmission buffer.
[0219] Alternatively, in some implementations, when the TX PDCP entity 214 is notified of a transmission opportunity by the lower layer, the TX PDCP entity 214 may re-segment the segment, if needed, so that the corresponding PDCP PDUs with new PDCP headers and new segment, fit within the total size of PDCP PDU (s) indicated by lower layer.
[0220] In some implementations, data forwarding may be performed if a PDCP SDU or a portion comprising the PDCP SDU and MAC-I is segmented.
[0221] In some implementations, if a source RAN node perform segmentation of a PDCP SDU after integrity protection and / or ciphering, during data forwarding, the source RAN node may forward a complete downlink PDCP SDU to a target RAN node if a portion of the PDCP SDU has transmitted but has not been successfully acknowledged.
[0222] For example, if one or more segments of a PDCP SDU have not been successfully acknowledged, the source RAN node forwards a complete downlink PDCP SDU.
[0223] For example, if a PDCP SN has been assigned for the PDCP SDU, the source RAN node forwards the PDCP SN together with the PDCP SDU. Additionally, the source RAN node forwards the HFN together with the PDCP SDU. The target RAN node is responsible to perform security handling.
[0224] In some implementations, a PDCP re-establishment procedure may be performed.
[0225] In some implementations, if security key is changed, the PDCP entity 214 of the first device 210 is triggered to perform connection re-establishment. In such implementations, the PDCP entity 214 may remove a PDCP SDU segment, for which the successful delivery of the PDCP PDU has not been confirmed by the first device prior to the PDCP entity re-establishment. Alternatively, the PDCP entity 214 may remove the PDCP PDU which comprises a segment prior to the PDCP entity re-establishment. For example, if a segment of the PDCP SDU or a segment of the portion comprising the PDCP SDU and MAC-I has not been confirmed by the first device, the PDCP entity 214 may remove the PDCP PDU prior to the PDCP entity re-establishment. For example, if a PDCP PDU including a segment of the PDCP SDU or a segment of the portion comprising the PDCP SDU and MAC-I has not been delivered to lower layer by the first device and even if at least one segment of the PDCP SDU has successful delivery of the PDCP PDU has been confirmed by the first device, the PDCP entity 214 still remove the PDCP PDU formed prior to the PDCP entity re-establishment . In such implementations, the PDCP entity 214 may perform retransmission or transmission of the complete PDCP SDUs already associated with PDCP SNs in an ascending order of the COUNT values associated to the PDCP SDU prior to the PDCP re-establishment as described with reference to Figs. 5 and 8.
[0226] In some implementations, after performing the segmentation of the PDCP SDU to generate PDCP SDU segments, the TX PDCP entity 214 may perform at least one of the following for the PDCP PDU comprising the PDCP SDU segments: integrity protection, or ciphering. In other words, the TX PDCP entity 214 may perform segmentation before integrity protection and / or ciphering. In addition, the TX PDCP entity 214 may perform re-integrity protection or re-ciphering for the segment after re-segmentation. This will be described with reference to Fig. 9.
[0227] Fig. 9 illustrates a signaling diagram illustrating an example process 900 that supports segmentation at a PDCP entity for data transmission in accordance with aspects of the present disclosure. The process 900 may be considered as an example implementation of the process 400. The process 900 may involve the TX PDCP entity 214 of the first device 210 for wireless communication and the RX PDCP entity 224 of the second device 220 for wireless communication in Fig. 3. For the purpose of discussion, the process 900 will be described with reference to Fig. 3.
[0228] Generally, in the process 900, the TX PDCP entity 214 may be configured to support segmentation before integrity protection or ciphering.
[0229] As shown in Fig. 9, at 910, the TX PDCP entity 214 receives a PDCP SDU from an upper layer and assigns a PDCP SN for the PDCP SDU.
[0230] At 915, the TX PDCP entity 214 may perform IP header compression if configured.
[0231] At 920, the TX PDCP entity 214 may perform segmentation of a PDCP SDU if needed.
[0232] At 925, the TX PDCP entity 214 may perform integrity protection if configured.
[0233] In some implementations, the PDCP PDU may comprise a PDCP header and a data part. The PDCP header may comprise the information related to segmentation.
[0234] In some implementations, the first device 210 may perform integrity protection for the PDCP SDU and a PDCP header of the PDCP PDU. The PDCP header includes the information related to segmentation. In such implementations, the data unit that is integrity protected is the data part of the PDCP PDU and the PDCP header including the information related to segmentation and before ciphering.
[0235] In some implementations, the information related to segmentation may comprise a first indication. The first indication indicates whether the PDCP PDU contains a complete PDCP SDU or contains a start, middle or end segment of the PDCP SDU.
[0236] Additionally or alternatively, the information related to segmentation may comprise a second indication. The second indication may indicate a position of the PDCP SDU segment in bytes within the PDCP SDU.
[0237] In some implementations, in case where the segments use the same PDCP SN or PDCP COUNT, the information related to segmentation may be used as security input parameters.
[0238] In some implementations, in case where the segments associated with the different PDCP SNs or PDCP COUNTs, the information related to segmentation may be not used as security input parameters.
[0239] In some implementations, the first device 210 may receive a configuration for the integrity protection or ciphering from the second device 220. The PDCP configuration indicates whether to use the information related to segmentation as input for at least one of the following for the PDCP SDU segment: integrity protection or ciphering.
[0240] At 930, the TX PDCP entity 214 may perform ciphering if configured.
[0241] For example, the data unit that is ciphered is the MAC-I and the data part of the PDCP Data PDU except the SDAP header and the SDAP Control PDU if included in the PDCP SDU.
[0242] At 935, the TX PDCP entity 214 may add a PDCP header to form a PDCP PDU.
[0243] In some implementations, when the TX PDCP entity 214 is notified of a transmission opportunity by the lower layer, the TX PDCP entity 214 shall perform segmentation of the RLC SDUs, if needed, so that the corresponding PDCP PDUs with PDCP headers, fit within the total size of PDCP PDU (s) indicated by lower layer.
[0244] In some implementations, in case of PDCP PDU pre-process, the segmentation is performed before integrity protection and / or ciphering is finished and PDCP PDU is formed.
[0245] For example, the segmentation is performed before integrity protection and / or ciphering.
[0246] In some implementations, the TX PDCP entity 214 may perform re-segmentation of a PDCP SDU segment after a PDCP PDU including a PDCP SDU segment has been formed. For example, if the TX PDCP entity 214 determines that the corresponding PDCP PDUs with PDCP headers cannot fit within the total size of PDCP PDU(s) indicated by lower layer, the TX PDCP entity 214 may perform re-segmentation of the PDCP SDU to generate PDCP SDU segments.
[0247] In such implementations, the TX PDCP entity 214 may perform integrity protection for a new PDCP SDU segment.
[0248] For example, the data unit that is integrity protected is the PDU header and the data part of the PDU before ciphering. The PDU header for integrity protection includes at least the information related to segmentation, e.g., SI field and / or SO filed.
[0249] In some implementations, the TX PDCP entity 214 may apply a PDCP SN for a PDCP SDU segment as a parameter for integrity protection.
[0250] In some implementations, the TX PDCP entity 214 may apply the information related to segmentation as a parameter for integrity protection.
[0251] Then, the TX PDCP entity 214 may perform ciphering for the new PDCP SDU segment.
[0252] For example, the data unit that is ciphered is the MAC-I and the data part of the PDCP Data PDU except the SDAP header and the SDAP Control PDU if included in the PDCP SDU.
[0253] In some implementations, the TX PDCP entity 214 may apply a PDCP SN for a PDCP SDU segment as a parameter for re-ciphering.
[0254] In some implementations, the TX PDCP entity 214 may apply the information related to segmentation as a parameter for re-ciphering.
[0255] At 940, the TX PDCP entity 214 routes the PDCP PDU to lower layer for transmission.
[0256] In turn, the first device 210 may transmit the PDCP PDU including a PDCP SDU segment to the second device 220 via a radio interface. The PDCP PDU comprises information related to segmentation.
[0257] At 945, the RX PDCP entity 224 receives a PDCP PDU including a PDCP SDU segment from lower layer and removes a PDCP header.
[0258] At 950, the RX PDCP entity 224 performs deciphering for a ciphered PDCP PDU including a PDCP SDU segment.
[0259] In some implementations, the RX PDCP entity 224 may perform deciphering for a portion of the PDCP PDU comprising the information related to segmentation. For example, if the data part of the PDCP PDU including the information related to segmentation, the RX PDCP entity 224 may perform deciphering for a portion of the PDCP PDU comprising the information related to segmentation. Alternatively, if the PDCP header of the PDCP PDU including the information related to segmentation, the RX PDCP entity 224 may perform deciphering for a portion of the PDCP header comprising the information related to segmentation.
[0260] In some implementations, the RX PDCP entity 224 may perform deciphering for a portion of the PDCP PDU excluding the information related to segmentation. For example, if the PDCP header of the PDCP PDU including the information related to segmentation, the RX PDCP entity 224 does not perform deciphering for PDCP header.
[0261] In some implementations, the RX PDCP entity 224 may use the information related to segmentation as input for deciphering for the PDCP PDU.
[0262] Alternatively, in some implementations, the RX PDCP entity 224 may perform deciphering for a portion of the PDCP PDU including the information related to segmentation.
[0263] In some implementations, the RX PDCP entity 224 may use the information related to segmentation as input for deciphering for the PDCP PDU.
[0264] In some implementations, the second device 220 may receive a configuration for the integrity verification or deciphering from the first device 210. The PDCP configuration indicates whether to use the information related to the segmentation as input for at least one of the following for the PDCP SDU or the PDCP PDU: integrity verification or deciphering.
[0265] At 955, the RX PDCP entity 224 performs integrity verification for integrity protected PDCP PDU.
[0266] In some implementations, the RX PDCP entity 224 may perform integrity verification for the PDCP PDU.
[0267] In some implementations, the RX PDCP entity 224 may perform integrity verification for a portion of the PDCP PDU excluding the information related to segmentation.
[0268] In some implementations, the RX PDCP entity 224 may perform integrity verification for a portion of the PDCP PDU including the information related to segmentation.
[0269] In some implementations, the PDCP PDU may comprise a third indication indicating whether the information related to segmentation is integrity protected.
[0270] In some implementations, if the third indication indicates that the information related to segmentation is integrity protected, the RX PDCP entity 224 may perform integrity verification for a portion of the PDCP PDU including the information related to segmentation. If the third indication indicates that the information related to segmentation is not integrity protected, the RX PDCP entity 224 may perform integrity verification for a portion of the PDCP PDU excluding the information related to segmentation.
[0271] In some implementations, the RX PDCP entity 224 may use the information related to segmentation as input for integrity verification for the PDCP PDU.
[0272] In some implementations, if the third indication indicates that the information related to segmentation is integrity protected, the RX PDCP entity 224 may use the information related to segmentation as input for integrity verification for the PDCP PDU.
[0273] In some implementations, the PDCP PDU comprising the information related to segmentation may comprise the first indication. The first indication indicates whether the PDCP PDU contains a complete PDCP SDU or contains a start, middle or end segment of the PDCP SDU.
[0274] In some implementations, the first indication may be excluded from integrity verification.
[0275] In some implementations, the PDCP PDU comprising the information related to segmentation may comprise a second indication. The second indication indicates a position of the PDCP SDU segment in bytes within a portion comprising the PDCP SDU.
[0276] In some implementations, the second indication may be excluded from integrity verification.
[0277] In some implementations, at least one of the first indication and the second indication may be excluded from integrity verification.
[0278] At 960, the RX PDCP entity 224 reassembles a PDCP SDU from the received PDCP SDU segments in PDCP PDUs.
[0279] For example, if the PDCP SDU is segmented into more than one PDCP SDU segments, the RX PDCP entity 224 reassembles the PDCP SDU based on PDCP SDU segments, and the information related to segmentation. For example, the PDCP SDU segment is obtained from the PDCP PDU.
[0280] At 965, the RX PDCP entity 224 performs reordering and duplicate discarding.
[0281] At 970, the RX PDCP entity 224 performs decompression for compressed PDCP SDU.
[0282] In some implementations, if a source RAN node perform segmentation of a PDCP SDU before integrity protection and / or ciphering, during data forwarding, a source RAN node may forward a complete downlink PDCP SDU to a target RAN node if portion of the PDCP SDU has not been successfully acknowledged.
[0283] For example, if one or more segments of a PDCP SDU has not been successfully acknowledged, the source RAN node forwards a complete downlink PDCP SDU.
[0284] For example, if a PDCP SN has been assigned for the PDCP SDU, the source RAN node forwards the PDCP SN together with the PDCP SDU. The target RAN node is responsible to perform security handling.
[0285] Alternatively, in some implementations, if the source RAN node perform segmentation of a PDCP SDU before integrity protection and / or ciphering, during data forwarding, the source RAN node may forward a downlink PDCP SDU segment or downlink PDCP SDU to the target RAN node, even if one or more segments of a PDCP SDU has been successfully acknowledged.
[0286] For example, if one or more segments of a PDCP SDU has not been successfully acknowledged, the source RAN node forwards the one or more segments of the PDCP SDU.
[0287] For example, if at least one segment of a PDCP SDU has been successfully acknowledged, the source RAN node forwards the remaining one or more segments of the PDCP SDU, which has not been transmitted or which has been transmitted but has not been successfully acknowledged.
[0288] For example, if no segments of a PDCP SDU have been successfully acknowledged, the source RAN node forwards the complete PDCP SDU.
[0289] For example, if a PDCP SN has been assigned for the PDCP SDU or a PDCP SDU segment, the source RAN node forwards the PDCP SN together with the PDCP SDU or the PDCP SDU segment. The target RAN node is responsible to perform security handling.
[0290] In some implementations, the PDCP entity is triggered to perform connection re-establishment. In such implementations, the processor is further configured to: transmit or retransmit a PDCP SDU segment, for which the successful delivery of the corresponding PDCP PDU has not been confirmed by the first device prior to the PDCP entity re-establishment. For example, if at least one PDCP SDU segment has been positively acknowledged by the second device, transmit or retransmit a PDCP SDU segment, for which the successful delivery of the corresponding PDCP PDU has not been confirmed by the first device. The PDCP entity may form a new PDCP PDU based on not positively acknowledged PDCP SDU segment (s) .
[0291] In some implementations, the PDCP entity is triggered to perform connection re-establishment. In such implementations, the processor is further configured to: transmit a remaining PDCP SDU segment, for which the corresponding PDCP PDU has not been delivered to lower layers of the first device prior to the PDCP entity re-establishment. For example, if at least one PDCP SDU segment has been positively acknowledged by the second device, transmit a remaining segment, for which the corresponding PDCP PDU has not been delivered to lower layers of the first device.
[0292] In some implementations, the PDCP entity is triggered to perform connection re-establishment. In such implementations, the processor is further configured to: remove a PDCP SDU segment or a PDCP PDU including the segment, for which the successful delivery of the corresponding PDCP PDU has been confirmed by the first device prior to the PDCP entity re-establishment.
[0293] Fig. 10 illustrates an example of a device 1000 that supports segmentation at a PDCP entity for data transmission in accordance with aspects of the present disclosure. The device 1000 may be an example of a network entity 102 or a UE 104 as described herein. The device 1000 may support wireless communication with one or more network entities 102, UEs 104, or any combination thereof. The device 1000 may include components for bi-directional communications including components for transmitting and receiving communications, such as a processor 1002, a memory 1004, a transceiver 1006, and, optionally, an I / O controller 1008. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) .
[0294] The processor 1002, the memory 1004, the transceiver 1006, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. For example, the processor 1002, the memory 1004, the transceiver 1006, or various combinations or components thereof may support a method for performing one or more of the operations described herein.
[0295] In some implementations, the processor 1002, the memory 1004, the transceiver 1006, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry) . The hardware may include a processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure. In some implementations, the processor 1002 and the memory 1004 coupled with the processor 1002 may be configured to perform one or more of the functions described herein (e.g., executing, by the processor 1002, instructions stored in the memory 1004) .
[0296] For example, the processor 1002 may support wireless communication at the device 1000 in accordance with examples as disclosed herein. The processor 1002 may be configured to operable to support a means for performing the following: performing segmentation of a PDCP SDU at a PDCP entity of a first device; and transmitting a PDCP PDU including a PDCP SDU segment to a second device for wireless communication, wherein the PDCP PDU comprises information related to the segmentation.
[0297] Alternatively, in some implementations, the processor 1002 may be configured to operable to support a means for performing the following: receiving a PDCP PDU including a PDCP SDU segment at a second device from a first device for wireless communication, wherein the PDCP PDU comprises information related to segmentation of a PDCP SDU; and reassembling, at a PDCP entity of the second device, the PDCP SDU based on PDCP SDU segments and the information related to segmentation.
[0298] The processor 1002 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) . In some implementations, the processor 1002 may be configured to operate a memory array using a memory controller. In some other implementations, a memory controller may be integrated into the processor 1002. The processor 1002 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 1004) to cause the device 1000 to perform various functions of the present disclosure.
[0299] The memory 1004 may include random access memory (RAM) and read-only memory (ROM) . The memory 1004 may store computer-readable, computer-executable code including instructions that, when executed by the processor 1002 cause the device 1000 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some implementations, the code may not be directly executable by the processor 1002 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some implementations, the memory 1004 may include, among other things, a basic I / O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.
[0300] The I / O controller 1008 may manage input and output signals for the device 1000. The I / O controller 1008 may also manage peripherals not integrated into the device M02. In some implementations, the I / O controller 1008 may represent a physical connection or port to an external peripheral. In some implementations, the I / O controller 1008 may utilize an operating system such as or another known operating system. In some implementations, the I / O controller 1008 may be implemented as part of a processor, such as the processor 1006. In some implementations, a user may interact with the device 1000 via the I / O controller 1008 or via hardware components controlled by the I / O controller 1008.
[0301] In some implementations, the device 1000 may include a single antenna 1010. However, in some other implementations, the device 1000 may have more than one antenna 1010 (i.e., multiple antennas) , including multiple antenna panels or antenna arrays, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 1006 may communicate bi-directionally, via the one or more antennas 1010, wired, or wireless links as described herein. For example, the transceiver 1006 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 1006 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 1010 for transmission, and to demodulate packets received from the one or more antennas 1010. The transceiver 1006 may include one or more transmit chains, one or more receive chains, or a combination thereof.
[0302] A transmit chain may be configured to generate and transmit signals (e.g., control information, data, packets) . The transmit chain may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM) , frequency modulation (FM) , or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM) . The transmit chain may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmit chain may also include one or more antennas 1010 for transmitting the amplified signal into the air or wireless medium.
[0303] A receive chain may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receive chain may include one or more antennas 1010 for receive the signal over the air or wireless medium. The receive chain may include at least one amplifier (e.g., a low-noise amplifier (LNA) ) configured to amplify the received signal. The receive chain may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receive chain may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.
[0304] Fig. 11 illustrates an example of a processor 1100 that supports segmentation at a PDCP entity for data transmission in accordance with aspects of the present disclosure. The processor 1100 may be an example of a processor configured to perform various operations in accordance with examples as described herein. The processor 1100 may include a controller 1102 configured to perform various operations in accordance with examples as described herein. The processor 1100 may optionally include at least one memory 1104, such as L1 / L2 / L3 cache. Additionally, or alternatively, the processor 1100 may optionally include one or more arithmetic-logic units (ALUs) 1106. One or more of these components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) .
[0305] The processor 1100 may be a processor chipset and include a protocol stack (e.g., a software stack) executed by the processor chipset to perform various operations (e.g., receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) in accordance with examples as described herein. The processor chipset may include one or more cores, one or more caches (e.g., memory local to or included in the processor chipset (e.g., the processor 1100) or other memory (e.g., random access memory (RAM) , read-only memory (ROM) , dynamic RAM (DRAM) , synchronous dynamic RAM (SDRAM) , static RAM (SRAM) , ferroelectric RAM (FeRAM) , magnetic RAM (MRAM) , resistive RAM (RRAM) , flash memory, phase change memory (PCM) , and others) .
[0306] The controller 1102 may be configured to manage and coordinate various operations (e.g., signaling, receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) of the processor 1100 to cause the processor 1100 to support various operations in accordance with examples as described herein. For example, the controller 1102 may operate as a control unit of the processor 1100, generating control signals that manage the operation of various components of the processor 1100. These control signals include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.
[0307] The controller 1102 may be configured to fetch (e.g., obtain, retrieve, receive) instructions from the memory 1104 and determine subsequent instruction (s) to be executed to cause the processor 1100 to support various operations in accordance with examples as described herein. The controller 1102 may be configured to track memory address of instructions associated with the memory 1104. The controller 1102 may be configured to decode instructions to determine the operation to be performed and the operands involved. For example, the controller 1102 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 1100 to cause the processor 1100 to support various operations in accordance with examples as described herein. Additionally, or alternatively, the controller 1102 may be configured to manage flow of data within the processor 1100. The controller 1102 may be configured to control transfer of data between registers, arithmetic logic units (ALUs) , and other functional units of the processor 1100.
[0308] The memory 1104 may include one or more caches (e.g., memory local to or included in the processor 1100 or other memory, such RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. In some implementation, the memory 1104 may reside within or on a processor chipset (e.g., local to the processor 1100) . In some other implementations, the memory 1104 may reside external to the processor chipset (e.g., remote to the processor 1100) .
[0309] The memory 1104 may store computer-readable, computer-executable code including instructions that, when executed by the processor 1100, cause the processor 1100 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. The controller 1102 and / or the processor 1100 may be configured to execute computer-readable instructions stored in the memory 1104 to cause the processor 1100 to perform various functions. For example, the processor 1100 and / or the controller 1102 may be coupled with or to the memory 1104, the processor 1100, the controller 1102, and the memory 1104 may be configured to perform various functions described herein. In some examples, the processor 1100 may include multiple processors and the memory 1104 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein.
[0310] The one or more ALUs 1106 may be configured to support various operations in accordance with examples as described herein. In some implementation, the one or more ALUs 1106 may reside within or on a processor chipset (e.g., the processor 1100) . In some other implementations, the one or more ALUs 1106 may reside external to the processor chipset (e.g., the processor 1100) . One or more ALUs 1106 may perform one or more computations such as addition, subtraction, multiplication, and division on data. For example, one or more ALUs 1106 may receive input operands and an operation code, which determines an operation to be executed. One or more ALUs 1106 be configured with a variety of logical and arithmetic circuits, including adders, subtractors, shifters, and logic gates, to process and manipulate the data according to the operation. Additionally, or alternatively, the one or more ALUs 1106 may support logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 1106 to handle conditional operations, comparisons, and bitwise operations.
[0311] The processor 1100 may support wireless communication at the device 1000 in accordance with examples as disclosed herein. The processor 1100 may be configured to operable to support a means for performing the following: performing segmentation of a PDCP SDU at a PDCP entity of a first device; and transmitting a PDCP PDU including a PDCP SDU segment to a second device for wireless communication, wherein the PDCP PDU comprises information related to the segmentation.
[0312] Alternatively, in some implementations, the processor 1100 may be configured to operable to support a means for performing the following: receiving a PDCP PDU including a PDCP SDU segment at a second device from a first device for wireless communication, wherein the PDCP PDU comprises information related to segmentation of a PDCP SDU; and reassembling, at a PDCP entity of the second device, the PDCP SDU based on PDCP SDU segments and the information related to segmentation.
[0313] Fig. 12 illustrates a flowchart of a method 1200 that supports segmentation at a PDCP entity for data transmission in accordance with aspects of the present disclosure. The operations of the method 1200 may be implemented by a device or its components as described herein. For example, the operations of the method 1200 may be performed by the first device 210 (e.g., a UE 104 or a network entity 102) as described herein. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.
[0314] At 1210, the method may include performing, at a PDCP entity of the first device, segmentation of a PDCP SDU or a portion comprising the PDCP SDU and a MAC-I associated with the PDCP SDU to generate a segment. The operations of 1210 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1210 may be performed by a device as described with reference to Fig. 1, 2 or 3.
[0315] At 1220, the method may include transmitting a PDCP PDU including the segment to a second device for wireless communication, wherein the PDCP PDU comprises information related to the segmentation. The operations of 1220 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1220 may be performed by a device as described with reference to Fig. 1, 2 or 3.
[0316] Fig. 13 illustrates a flowchart of a method 1300 that supports segmentation at a PDCP entity for data transmission in accordance with aspects of the present disclosure. The operations of the method 1300 may be implemented by a device or its components as described herein. For example, the operations of the method 1300 may be performed by the second device 220 (e.g., a UE 104 or a network entity 102) as described herein. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.
[0317] At 1310, the method may include receiving a PDCP PDU including a segment at a second device from a first device for wireless communication, wherein the PDCP PDU comprises information related to segmentation of a PDCP SDU or a portion comprising the PDCP SDU and a MAC-I associated with the PDCP SDU. The operations of 1310 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1310 may be performed by a device as described with reference to Fig. 1, 2 or 3.
[0318] At 1320, the method may include reassembling, at a PDCP entity of the second device, the PDCP SDU based on PDCP SDU segments and the information related to segmentation. The operations of 1320 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1320 may be performed by a device as described with reference to Fig. 1, 2 or 3.
[0319] It shall be noted that implementations of the present disclosure which have been described with reference to Figs. 1 to 9 are also applicable to the device 1000, the processor 1100 as well as the methods 1200 and 1300.
[0320] It should be noted that the methods described herein describes possible implementations, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible. Further, aspects from two or more of the methods may be combined.
[0321] The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed with a general-purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
[0322] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
[0323] Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer. By way of example, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.
[0324] As used herein, including in the claims, an article “a” before an element is unrestricted and understood to refer to “at least one” of those elements or “one or more” of those elements. The terms “a, ” “at least one, ” “one or more, ” and “at least one of one or more” may be interchangeable. As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of” or “one or both of” ) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) . Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on”shall be construed in the same manner as the phrase “based at least in part on. Further, as used herein, including in the claims, a “set” may include one or more elements.
[0325] The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.
Claims
1.A first device for wireless communication, comprising:a processor; anda transceiver coupled to the processor,wherein the processor is configured to:perform, at a packet data convergence protocol (PDCP) entity of the first device, segmentation of a PDCP service data unit (SDU) or a portion comprising the PDCP SDU and a message authentication code for integrity (MAC-I) associated with the PDCP SDU to generate a segment; andtransmit a PDCP protocol data unit (PDU) including the segment via the transceiver to a second device for wireless communication, wherein the PDCP PDU comprises information related to the segmentation.2.The first device of claim 1, wherein the processor is further configured to:perform at least one of the following for the PDCP SDU: integrity protection or ciphering.3.The first device of claim 2, wherein the processor is further configured to:perform integrity protection for the PDCP SDU and a portion of PDCP header of the PDCP PDU, wherein the portion of PDCP header excludes the information related to the segmentation.4.The first device of claim 1, wherein the processor is further configured to:perform at least one of the following for a portion of the PDCP PDU excluding the information related to the segmentation: integrity protection or ciphering.5.The first device of claim 1, wherein the processor is further configured to:perform at least one of the following for a portion of the PDCP PDU comprising the information related to the segmentation: integrity protection or ciphering.6.The first device of claim 1, wherein the information related to the segmentation comprises a first indication indicating whether the PDCP PDU contains a complete PDCP SDU or contains a start, middle or end segment of the PDCP SDU.7.The first device of claim 1, wherein the information related to the segmentation comprises a first indication indicating whether the PDCP PDU contains a complete PDCP SDU and the MAC-I or contains a start, middle or end segment of the portion comprising the PDCP SDU and the MAC-I.8.The first device of claim 1, wherein the PDCP SDU is a ciphered PDCP SDU that is not integrity protected; andwherein the processor is configured to perform the segmentation of the PDCP SDU by:performing the segmentation of the ciphered PDCP SDU.9.The first device of claim 8, wherein the information related to the segmentation comprises a second indication indicating a position of the PDCP SDU segment in bytes within a portion comprising the ciphered PDCP SDU.10.The first device of claim 1, wherein the processor is further configured to:perform integrity protection for the PDCP SDU to generate the MAC-I associated with the PDCP SDU; andperform ciphering for the PDCP SDU to generate a ciphered PDCP SDU; andwherein the processor is configured to perform the segmentation of the PDCP SDU by:performing the segmentation of the ciphered PDCP SDU and the MAC-I.11.The first device of claim 10, wherein the information related to the segmentation comprises a second indication indicating a position of a PDCP SDU segment in bytes within a portion comprising the ciphered PDCP SDU and the MAC-I.12.The first device of claim 1, wherein the PDCP entity is triggered to perform connection re-establishment; andwherein the processor is further configured to:remove a PDCP SDU segment, for which successful delivery of the PDCP PDU has not been confirmed by the first device; orremove the PDCP PDU which comprises the PDCP SDU segment.13.The first device of claim 1, wherein the processor is further configured to:receive a configuration for the segmentation via the transceiver from the second device; andwherein the processor is configured to perform the segmentation of the PDCP SDU based on the configuration.14.The first device of claim 1, wherein the processor is further configured to:use the information related to the segmentation as input for at least one of the following for the PDCP SDU or the PDCP SDU segment: integrity protection or ciphering.15.The first device of claim 1, wherein the processor is further configured to:perform at least one of the following for PDCP SDU segments: integrity protection or ciphering.16.A second device for wireless communication, comprising:a processor; anda transceiver coupled to the processor,wherein the processor is configured to:receive a packet data convergence protocol (PDCP) protocol data unit (PDU) including a segment via the transceiver from a first device for wireless communication, wherein the PDCP PDU comprises information related to segmentation of a PDCP service data unit (SDU) or a portion comprising the PDCP SDU and a message authentication code for integrity (MAC-I) associated with the PDCP SDU; andreassemble, at a PDCP entity of the second device, the PDCP SDU based on segments and the information related to segmentation.17.The second device of claim 16, wherein the processor is further configured to:perform at least one of the following for the PDCP SDU or the PDCP PDU: integrity verification or deciphering.18.The second device of claim 16, wherein the processor is further configured to:perform integrity verification for the PDCP SDU and a portion of PDCP header of the PDCP PDU, wherein the portion of PDCP header of the PDCP PDU excludes the information related to segmentation.19.A method for wireless communication, comprising:performing, at a packet data convergence protocol (PDCP) entity of the first device, segmentation of a PDCP service data unit (SDU) or a portion comprising the PDCP SDU and a message authentication code for integrity (MAC-I) associated with the PDCP SDU to generate a segment; andtransmitting a PDCP protocol data unit (PDU) including the segment to a second device for wireless communication, wherein the PDCP PDU comprises information related to the segmentation.20.A method for wireless communication, comprising:receiving a packet data convergence protocol (PDCP) protocol data unit (PDU) including a segment at a second device from a first device for wireless communication, wherein the PDCP PDU comprises information related to segmentation of a PDCP service data unit (SDU) or a portion comprising the PDCP SDU and a message authentication code for integrity (MAC-I) associated with the PDCP SDU; andreassembling, at a PDCP entity of the second device, the PDCP SDU based on PDCP SDU segments and the information related to segmentation.
Citation Information
Patent Citations
Method for improving resource efficiency
CN119698921A
Enhancements for PDCP layer
US20160308776A1
Media access control segmentation and packet data convergence protocol delivery notification with enhanced component carriers
US20170041766A1