Media data delivery handling for uplink transmission with discarding of an FEC PDU upon activation of discarding

Abstract

A wireless device sends, to a base station, a first message comprising a capability indicator indicating that the wireless device supports discarding of forward-error-correction (FEC) protocol data units (PDUs). The wireless device receives, from the base station, a radio resource control (RRC) message indicating that discarding FEC PDU is configured, and a medium access control (MAC) control element (CE) indicating an activation of the discarding FEC PDU. The wireless device discards, based on the activation of the discarding FEC PDU, one or more FEC PDUs associated with one or more PDU sets, of an application of the wireless device, and sends, to the base station, one or more non-FEC PDUs.

Description

TITLEMEDIA DATA DELIVERY HANDLING FOR UPLINK TRANSMISSION WITH DISCARDING OF AN FEC PDU UPON ACTIVATION OF DISCARDINGCROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of U.S. Provisional Application No. 63 / 550,364, filed February 6, 2024, which is hereby incorporated by reference in its entirety.BRIEF DESCRIPTION OF THE DRAWINGS

[0002] Examples of several of the various embodiments of the present disclosure are described herein with reference to the drawings.

[0003] FIG. 1 A and FIG. 1 B illustrate example communication networks including an access network and a core network.

[0004] FIG. 2A, FIG. 2B, FIG. 20, and FIG. 2D illustrate various examples of a framework for a service-based architecture within a core network.

[0005] FIG. 3 illustrates an example communication network including core network functions.

[0006] FIG. 4A and FIG. 4B illustrate example of core network architecture with multiple user plane functions and untrusted access.

[0007] FIG. 5 illustrates an example of a core network architecture for a roaming scenario.

[0008] FIG. 6 illustrates an example of network slicing.

[0009] FIG. 7A, FIG. 7B, and FIG. 70 illustrate a user plane protocol stack, a control plane protocol stack, and services provided between protocol layers of the user plane protocol stack.

[0010] FIG. 8 illustrates an example of a quality of service model for data exchange.

[0011] FIG. 9A, FIG. 9B, FIG. 90, and FIG. 9D illustrate example states and state transitions of a wireless device.

[0012] FIG. 10 illustrates an example of a registration procedure for a wireless device.

[0013] FIG. 11 illustrates an example of a service request procedure for a wireless device.

[0014] FIG. 12 illustrates an example of a protocol data unit session establishment procedure for a wireless device.

[0015] FIG. 13 illustrates examples of components of the elements in a communications network.

[0016] FIG. 14A, FIG. 14B, FIG. 140, and FIG. 14D illustrate various examples of physical core network deployments, each having one or more network functions or portions thereof.

[0017] FIG. 15 is a diagram of an aspect of an example embodiment of the present disclosure.

[0018] FIG. 16 is a diagram of an aspect of an example embodiment of the present disclosure.

[0019] FIG. 17 is a diagram of an aspect of an example embodiment of the present disclosure.

[0020] FIG. 18 is a diagram of an aspect of an example embodiment of the present disclosure.

[0021] FIG. 19 is a diagram of an aspect of an example embodiment of the present disclosure.

[0022] FIG. 20 is a diagram of an aspect of an example embodiment of the present disclosure.

[0023] FIG. 21 is a diagram of an aspect of an example embodiment of the present disclosure.

[0024] FIG. 22 is a diagram of an aspect of an example embodiment of the present disclosure.

[0025] FIG. 23 is a diagram of an aspect of an example embodiment of the present disclosure.

[0026] FIG. 24 is a diagram of an aspect of an example embodiment of the present disclosure.

[0027] FIG. 25 is a diagram of an aspect of an example embodiment of the present disclosure.

[0028] FIG. 26 is a diagram of an aspect of an example embodiment of the present disclosure.

[0029] FIG. 27 is a diagram of an aspect of an example embodiment of the present disclosure.

[0030] FIG. 28 is a diagram of an aspect of an example embodiment of the present disclosure.DETAILED DESCRIPTION

[0031] In the present disclosure, various embodiments are presented as examples of how the disclosed techniques may be implemented and / or how the disclosed techniques may be practiced in environments and scenarios. It will be apparent to persons skilled in the relevant art that various changes in form and detail can be made therein without departing from the scope. In fact, after reading the description, it will be apparent to one skilled in the relevant art how to implement alternative embodiments. The present embodiments should not be limited by any of the described exemplary embodiments. The embodiments of the present disclosure will be described with reference to the accompanying drawings. Limitations, features, and / or elements from the disclosed example embodiments may be combined to create further embodiments within the scope of the disclosure. Any figures which highlight the functionality and advantages, are presented for example purposes only. The disclosed architecture is sufficiently flexible and configurable, such that it may be utilized in ways other than that shown. For example, the actions listed in any flowchart may be re-ordered or only optionally used in some embodiments.

[0032] Embodiments may be configured to operate as needed. The disclosed mechanism may be performed when certain criteria are met, for example, in a wireless device, a base station, a radio environment, a network, a combination of the above, and / or the like. Example criteria may be based, at least in part, on for example, wireless device or network node configurations, traffic load, initial system set up, packet sizes, traffic characteristics, a combination of the above, and / or the like. When the one or more criteria are met, various example embodiments may be applied. Therefore, it may be possible to implement example embodiments that selectively implement disclosed protocols.

[0033] A base station may communicate with a mix of wireless devices. Wireless devices and / or base stations may support multiple technologies, and / or multiple releases of the same technology. Wireless devices may have one or more specific capabilities. When this disclosure refers to a base station communicating with a plurality of wireless devices, this disclosure may refer to a subset of the total wireless devices in a coverage area. This disclosure may refer to, for example, a plurality of wireless devices of a given LTE or 5G release with a given capability and in a given sector of the base station. The plurality of wireless devices in this disclosure may refer to a selected plurality of wireless devices, and / or a subset of total wireless devices in a coverage area which perform according to disclosed methods, and / or the like. There may be a plurality of base stations or a plurality of wireless devices in a coverage area that may not comply with the disclosed methods, for example, those wireless devices or base stations may perform based on older releases of LTE or 5G technology.

[0034] In this disclosure, “a” and “an” and similar phrases refer to a single instance of a particular element, but shouldnot be interpreted to exclude other instances of that element. For example, a bicycle with two wheels may be described as having “a wheel”. Any term that ends with the suffix “(s)” is to be interpreted as “at least one” and / or “one or more.” In this disclosure, the term “may” is to be interpreted as “may, for example.” In other words, the term “may” is indicative that the phrase following the term “may” is an example of one of a multitude of suitable possibilities that may, or may not, be employed by one or more of the various embodiments. The terms “comprises” and “consists of”, as used herein, enumerate one or more components of the element being described. The term “comprises” is interchangeable with “includes” and does not exclude unenumerated components from being included in the element being described. By contrast, “consists of” provides a complete enumeration of the one or more components of the element being described.

[0035] The phrases “based on”, “in response to”, “depending on”, “employing”, “using”, and similar phrases indicate the presence and / or influence of a particular factor and / or condition on an event and / or action, but do not exclude unenumerated factors and / or conditions from also being present and / or influencing the event and / or action. For example, if action X is performed “based on” condition Y, this is to be interpreted as the action being performed “based at least on” condition Y. For example, if the performance of action X is performed when conditions Y and Z are both satisfied, then the performing of action X may be described as being “based on Y”.

[0036] The term “configured” may relate to the capacity of a device whether the device is in an operational or non- operational state. Configured may refer to specific settings in a device that effect the operational characteristics of the device whether the device is in an operational or non-operational state. In other words, the hardware, software, firmware, registers, memory values, and / or the like may be “configured” within a device, whether the device is in an operational or nonoperational state, to provide the device with specific characteristics. Terms such as “a control message to cause in a device” may mean that a control message has parameters that may be used to configure specific characteristics or may be used to implement certain actions in the device, whether the device is in an operational or non-operational state.

[0037] In this disclosure, a parameter may comprise one or more information objects, and an information object may comprise one or more other objects. For example, if parameter J comprises parameter K, and parameter K comprises parameter L, and parameter L comprises parameter M, then J comprises L, and J comprises M. A parameter may be referred to as a field or information element. In an example embodiment, when one or more messages comprise a plurality of parameters, it implies that a parameter in the plurality of parameters is in at least one of the one or more messages, but does not have to be in each of the one or more messages.

[0038] This disclosure may refer to possible combinations of enumerated elements. For the sake of brevity and legibility, the present disclosure does not explicitly recite each and every permutation that may be obtained by choosing from a set of optional features. The present disclosure is to be interpreted as explicitly disclosing all such permutations. For example, the seven possible combinations of enumerated elements A, B, C consist of: (1) “A”; (2) “B”; (3) “C”; (4) “A and B”; (5) “A and C”; (6) “B and C”; and (7) “A, B, and C”. For the sake of brevity and legibility, these seven possible combinations may be described using any of the following interchangeable formulations: “at least one of A, B, and C”;“at least one of A, B, or C”; “one or more of A, B, and C”; “one or more of A, B, or C”; “A, B, and / or C”. It will be understood that impossible combinations are excluded. For example, “X and / or not-X” should be interpreted as “X or not-X”. It will be further understood that these formulations may describe alternative phrasings of overlapping and / or synonymous concepts, for example, “identifier, identification, and / or ID number”.

[0039] This disclosure may refer to sets and / or subsets. As an example, set X may be a set of elements comprising one or more elements. If every element of X is also an element of Y, then X may be referred to as a subset of Y. In this disclosure, only non-empty sets and subsets are considered. For example, if Y consists of the elements Y1 , Y2, and Y3, then the possible subsets of Y are {Y1, Y2, Y3}, {Y1, Y2}, {Y1, Y3}, {Y2, Y3}, {Y1 }, {Y2}, and {Y3}.

[0040] FIG. 1A illustrates an example of a communication network 100 in which embodiments of the present disclosure may be implemented. The communication network 100 may comprise, for example, a public land mobile network (PLMN) run by a network operator. As illustrated in FIG. 1A, the communication network 100 includes a wireless device 101, an access network (AN) 102, a core network (ON) 105, and one or more data network (DNs) 108.

[0041] The wireless device 101 may communicate with DNs 108 via AN 102 and ON 105. In the present disclosure, the term wireless device may refer to and encompass any mobile device or fixed (non-mobile) device for which wireless communication is needed or usable. For example, a wireless device may be a telephone, smart phone, tablet, computer, laptop, sensor, meter, wearable device, Internet of Things (loT) device, vehicle road side unit (RSU), relay node, automobile, unmanned aerial vehicle, urban air mobility, and / or any combination thereof. The term wireless device encompasses other terminology, including user equipment (UE), user terminal (UT), access terminal (AT), mobile station, handset, wireless transmit and receive unit (WTRU), and / or wireless communication device.

[0042] The AN 102 may connect wireless device 101 to ON 105 in any suitable manner. The communication direction from the AN 102 to the wireless device 101 is known as the downlink and the communication direction from the wireless device 101 to AN 102 is known as the uplink. Downlink transmissions may be separated from uplink transmissions using frequency division duplexing (FDD), time-division duplexing (TDD), and / or some combination of the two duplexing techniques. The AN 102 may connect to wireless device 101 through radio communications over an air interface. An access network that at least partially operates over the air interface may be referred to as a radio access network (RAN). The ON 105 may set up one or more end-to-end connection between wireless device 101 and the one or more DNs 108. The ON 105 may authenticate wireless device 101 and provide charging functionality.

[0043] In the present disclosure, the term base station may refer to and encompass any element of AN 102 that facilitates communication between wireless device 101 and AN 102. Access networks and base stations have many different names and implementations. The base station may be a terrestrial base station fixed to the earth. The base station may be a mobile base station with a moving coverage area. The base station may be in space, for example, on board a satellite. For example, WiFi and other standards may use the term access point. As another example, the Third-Generation Partnership Project (3GPP) has produced specifications for three generations of mobile networks, each of which uses different terminology. Third Generation (3G) and / or Universal Mobile Telecommunications System (UMTS) standards may use the term Node B. 4G, Long Term Evolution (LTE), and / or Evolved Universal TerrestrialRadio Access (E-UTRA) standards may use the term Evolved Node B (eNB). 5G and / or New Radio (NR) standards may describe AN 102 as a next-generation radio access network (NG-RAN) and may refer to base stations as Next Generation eNB (ng-eNB) and / or Generation Node B (g NB). Future standards (for example, 6G, 7G, 8G) may use new terminology to refer to the elements which implement the methods described in the present disclosure (e.g. , wireless devices, base stations, ANs, ONs, and / or components thereof). A base station may be implemented as a repeater or relay node used to extend the coverage area of a donor node. A repeater node may amplify and rebroadcast a radio signal received from a donor node. A relay node may perform the same / similar functions as a repeater node but may decode the radio signal received from the donor node to remove noise before amplifying and rebroadcasting the radio signal.

[0044] The AN 102 may include one or more base stations, each having one or more coverage areas. The geographical size and / or extent of a coverage area may be defined in terms of a range at which a receiver of AN 102 can successfully receive transmissions from a transmitter (e.g., wireless device 101) operating within the coverage area (and / or vice-versa). The coverage areas may be referred to as sectors or cells (although in some contexts, the term cell refers to the carrier frequency used in a particular coverage area, rather than the coverage area itself). Base stations with large coverage areas may be referred to as macrocell base stations. Other base stations cover smaller areas, for example, to provide coverage in areas with weak macrocell coverage, or to provide additional coverage in areas with high traffic (sometimes referred to as hotspots). Examples of small cell base stations include, in order of decreasing coverage area, microcell base stations, picocell base stations, and femtocell base stations or home base stations. Together, the coverage areas of the base stations may provide radio coverage to wireless device 101 over a wide geographic area to support wireless device mobility.

[0045] A base station may include one or more sets of antennas for communicating with the wireless device 101 over the air interface. Each set of antennas may be separately controlled by the base station. Each set of antennas may have a corresponding coverage area. As an example, a base station may include three sets of antennas to respectively control three coverage areas on three different sides of the base station. The entirety of the base station (and its corresponding antennas) may be deployed at a single location. Alternatively, a controller at a central location may control one or more sets of antennas at one or more distributed locations. The controller may be, for example, a baseband processing unit that is part of a centralized or cloud RAN architecture. The baseband processing unit may be either centralized in a pool of baseband processing units or virtualized. A set of antennas at a distributed location may be referred to as a remote radio head (RRH).

[0046] FIG. 1 B illustrates another example communication network 150 in which embodiments of the present disclosure may be implemented. The communication network 150 may comprise, for example, a PLMN run by a network operator. As illustrated in FIG. 1 B, communication network 150 includes UEs 151 , a next generation radio access network (NG-RAN) 152, a 5G core network (5G-CN) 155, and one or more DNs 158. The NG-RAN 152 includes one or more base stations, illustrated as generation node Bs (gNBs) 152A and next generation evolved Node Bs (ng eNBs) 152B. The 5G-CN 155 includes one or more network functions (NFs), including control plane functions 155A anduser plane functions 155B. The one or more DNs 158 may comprise public DNs (e.g., the Internet), private DNs, and / or intra-operator DNs. Relative to corresponding components illustrated in FIG. 1 A, these components may represent specific implementations and / or terminology.

[0047] The base stations of the NG-RAN 152 may be connected to the UEs 151 via Uu interfaces. The base stations of the NG-RAN 152 may be connected to each other via Xn interfaces. The base stations of the NG-RAN 152 may be connected to 5G ON 155 via NG interfaces. The Uu interface may include an air interface. The NG and Xn interfaces may include an air interface, or may consist of direct physical connections and / or indirect connections over an underlying transport network (e.g., an internet protocol (IP) transport network).

[0048] Each of the Uu, Xn, and NG interfaces may be associated with a protocol stack. The protocol stacks may include a user plane (UP) and a control plane (CP). Generally, user plane data may include data pertaining to users of the UEs 151, for example, internet content downloaded via a web browser application, sensor data uploaded via a tracking application, or email data communicated to or from an email server. Control plane data, by contrast, may comprise signaling and messages that facilitate packaging and routing of user plane data so that it can be exchanged with the DN(s). The NG interface, for example, may be divided into an NG user plane interface (NG-U) and an NG control plane interface (NG-C). The NG-U interface may provide delivery of user plane data between the base stations and the one or more user plane network functions 155B. The NG-C interface may be used for control signaling between the base stations and the one or more control plane network functions 155A. The NG-C interface may provide, for example, NG interface management, UE context management, UE mobility management, transport of NAS messages, paging, PDU session management, and configuration transfer and / or warning message transmission. In some cases, the NG-C interface may support transmission of user data (for example, a small data transmission for an loT device).

[0049] One or more of the base stations of the NG-RAN 152 may be split into a central unit (CU) and one or more distributed units (DUs). A CU may be coupled to one or more DUs via an F1 interface. The CU may handle one or more upper layers in the protocol stack and the DU may handle one or more lower layers in the protocol stack. For example, the CU may handle RRC, PDCP, and SDAP, and the DU may handle RLC, MAC, and PHY. The one or more DUs may be in geographically diverse locations relative to the CU and / or each other. Accordingly, the CU / DU split architecture may permit increased coverage and / or better coordination.

[0050] The gNBs 152A and ng-eNBs 152B may provide different user plane and control plane protocol termination towards the UEs 151. For example, the gNB 154A may provide new radio (NR) protocol terminations over a Uu interface associated with a first protocol stack. The ng-eNBs 152B may provide Evolved UMTS Terrestrial Radio Access (E-UTRA) protocol terminations over a Uu interface associated with a second protocol stack.

[0051] The 5G-CN 155 may authenticate UEs 151, set up end-to-end connections between UEs 151 and the one or more DNs 158, and provide charging functionality. The 5G-CN 155 may be based on a service-based architecture, in which the NFs making up the 5G-CN 155 offer services to each other and to other elements of the communication network 150 via interfaces. The 5G-CN 155 may include any number of other NFs and any number of instances of each NF.

[0052] FIG. 2A, FIG. 2B, FIG. 20, and FIG. 2D illustrate various examples of a framework for a service-based architecture within a core network. In a service-based architecture, a service may be sought by a service consumer and provided by a service producer. Prior to obtaining a particular service, an NF may determine where such a service can be obtained. To discover a service, the NF may communicate with a network repository function (NRF). As an example, an NF that provides one or more services may register with a network repository function (NRF). The NRF may store data relating to the one or more services that the NF is prepared to provide to other NFs in the service-based architecture. A consumer NF may query the NRF to discover a producer NF (for example, by obtaining from the NRF a list of NF instances that provide a particular service).

[0053] In the example of FIG. 2A, an NF 211 (a consumer NF in this example) may send a request 221 to an NF 212 (a producer NF). The request 221 may be a request for a particular service and may be sent based on a discovery that NF 212 is a producer of that service. The request 221 may comprise data relating to NF 211 and / or the requested service. The NF 212 may receive request 221, perform one or more actions associated with the requested service (e.g., retrieving data), and provide a response 221. The one or more actions performed by the NF 212 may be based on request data included in the request 221, data stored by NF 212, and / or data retrieved by NF 212. The response 222 may notify NF 211 that the one or more actions have been completed. The response 222 may comprise response data relating to NF 212, the one or more actions, and / or the requested service.

[0054] In the example of FIG. 2B, an NF 231 sends a request 241 to an NF 232. In this example, part of the service produced by NF 232 is to send a request 242 to an NF 233. The NF 233 may perform one or more actions and provide a response 243 to NF 232. Based on response 243, NF 232 may send a response 244 to NF 231. It will be understood from FIG. 2B that a single NF may perform the role of producer of services, consumer of services, or both. A particular NF service may include any number of nested NF services produced by one or more other NFs.

[0055] FIG. 20 illustrates examples of subscribe-notify interactions between a consumer NF and a producer NF. In FIG. 20, an NF 251 sends a subscription 261 to an NF 252. An NF 253 sends a subscription 262 to the NF 252. Two NFs are shown in FIG. 2C for illustrative purposes (to demonstrate that the NF 252 may provide multiple subscription services to different NFs), but it will be understood that a subscribe-notify interaction only requires one subscriber. The NFs 251 , 253 may be independent from one another. For example, the NFs 251 , 253 may independently discover NF 252 and / or independently determine to subscribe to the service offered by NF 252. In response to receipt of a subscription, the NF 252 may provide a notification to the subscribing NF. For example, NF 252 may send a notification 263 to NF 251 based on subscription 261 and may send a notification 264 to NF 253 based on subscription 262.

[0056] As shown in the example illustration of FIG. 20, the sending of the notifications 263, 264 may be based on a determination that a condition has occurred. For example, the notifications 263, 264 may be based on a determination that a particular event has occurred, a determination that a particular condition is outstanding, and / or a determination that a duration of time associated with the subscription has elapsed (for example, a period associated with a subscription for periodic notifications). As shown in the example illustration of FIG. 20, NF 252 may send notifications 263, 264 to NFs 251, 253 simultaneously and / or in response to the same condition. However, it will be understood thatthe NF 252 may provide notifications at different times and / or in response to different notification conditions. In an example, the NF 251 may request a notification when a certain parameter, as measured by the NF 252, exceeds a first threshold, and the NF 252 may request a notification when the parameter exceeds a second threshold different from the first threshold. In an example, a parameter of interest and / or a corresponding threshold may be indicated in the subscriptions 261, 262.

[0057] FIG. 2D illustrates another example of a subscribe-notify interaction. In FIG. 2D, an NF 271 sends a subscription 281 to an NF 272. In response to receipt of subscription 281 and / or a determination that a notification condition has occurred, NF 272 may send a notification 284. The notification 284 may be sent to an NF 273. Unlike the example in FIG. 20 (in which a notification is sent to the subscribing NF), FIG. 2D demonstrates that a subscription and its corresponding notification may be associated with different NFs. For example, NF 271 may subscribe to the service provided by NF 272 on behalf of NF 273.

[0058] FIG. 3 illustrates another example communication network 300 in which embodiments of the present disclosure may be implemented. Communication network 300 includes a user equipment (UE) 301 , an access network (AN) 302, and a data network (DN) 308. The remaining elements depicted in FIG. 3 may be included in and / or associated with a core network. Each element of the core network may be referred to as a network function (NF).

[0059] The NFs depicted in FIG. 3 include a user plane function (UPF) 305, an access and mobility management function (AMF) 312, a session management function (SMF) 314, a policy control function (PCF) 320, a network repository function (NRF) 330, a network exposure function (NEF) 340, a unified data management (UDM) 350, an authentication server function (AUSF) 360, a network slice selection function (NSSF) 370, a charging function (CHF) 380, a network data analytics function (NWDAF) 390, and an application function (AF) 399. The UPF 305 may be a user-plane core network function, whereas the NFs 312, 314, and 320-390 may be control-plane core network functions. Although not shown in the example of FIG. 3, the core network may include additional instances of any of the NFs depicted and / or one or more different NF types that provide different services. Other examples of NF type include a gateway mobile location center (GMLC), a location management function (LMF), an operations, administration, and maintenance function (0AM), a public warning system (PWS), a short message service function (SMSF), a unified data repository (UDR), and an unstructured data storage function (UDSF).

[0060] Each element depicted in FIG. 3 has an interface with at least one other element. The interface may be a logical connection rather than, for example, a direct physical connection. Any interface may be identified using a reference point representation and / or a service-based representation. In a reference point representation, the letter ‘N’ is followed by a numeral, indicating an interface between two specific elements. For example, as shown in FIG. 3, AN 302 and UPF 305 interface via ‘N3’, whereas UPF 305 and DN 308 interface via ‘N6’. By contrast, in a service-based representation, the letter ‘N’ is followed by letters. The letters identify an NF that provides services to the core network. For example, PCF 320 may provide services via interface 'Npcf. The PCF 320 may provide services to any NF in the core network via 'Npcf. Accordingly, a service-based representation may correspond to a bundle of reference point representations. For example, the Npcf interface between PCF 320 and the core network generally may correspond toan N7 interface between PCF 320 and SMF 314, an N30 interface between PCF 320 and NEF 340, etc.

[0061] The UPF 305 may serve as a gateway for user plane traffic between AN 302 and DN 308. The UE 301 may connect to UPF 305 via a Uu interface and an N3 interface (also described as NG-U interface). The UPF 305 may connect to DN 308 via an N6 interface. The UPF 305 may connect to one or more other UPFs (not shown) via an N9 interface. The UE 301 may be configured to receive services through a protocol data unit (PDU) session, which is a logical connection between UE 301 and DN 308. The UPF 305 (or a plurality of UPFs if desired) may be selected by SMF 314 to handle a particular PDU session between UE 301 and DN 308. The SMF 314 may control the functions of UPF 305 with respect to the PDU session. The SMF 314 may connect to UPF 305 via an N4 interface. The UPF 305 may handle any number of PDU sessions associated with any number of UEs (via any number of ANs). For purposes of handling the one or more PDU sessions, UPF 305 may be controlled by any number of SMFs via any number of corresponding N4 interfaces.

[0062] The AMF 312 depicted in FIG. 3 may control UE access to the core network. The UE 301 may register with the network via AMF 312. It may be necessary for UE 301 to register prior to establishing a PDU session. The AMF 312 may manage a registration area of UE 301, enabling the network to track the physical location of UE 301 within the network. For a UE in connected mode, AMF 312 may manage UE mobility, for example, handovers from one AN or portion thereof to another. For a UE in idle mode, AMF 312 may perform registration updates and / or page the UE to transition the UE to connected mode.

[0063] The AMF 312 may receive, from UE 301, non-access stratum (NAS) messages transmitted in accordance with NAS protocol. NAS messages relate to communications between UE 301 and the core network. Although NAS messages may be relayed to AMF 312 via AN 302, they may be described as communications via the N1 interface. NAS messages may facilitate UE registration and mobility management, for example, by authenticating, identifying, configuring, and / or managing a connection of UE 301. NAS messages may support session management procedures for maintaining user plane connectivity and quality of service (QoS) of a session between UE 301 and DN 309. If the NAS message involves session management, AMF 312 may send the NAS message to SMF 314. NAS messages may be used to transport messages between UE 301 and other components of the core network (e.g., core network components other than AMF 312 and SMF 314). The AMF 312 may act on a particular NAS message itself, or alternatively, forward the NAS message to an appropriate core network function (e.g., SMF 314, etc.)

[0064] The SMF 314 depicted in FIG. 3 may establish, modify, and / or release a PDU session based on messaging received UE 301. The SMF 314 may allocate, manage, and / or assign an IP address to UE 301, for example, upon establishment of a PDU session. There may be multiple SMFs in the network, each of which may be associated with a respective group of wireless devices, base stations, and / or UPFs. A UE with multiple PDU sessions may be associated with a different SMF for each PDU session. As noted above, SMF 314 may select one or more UPFs to handle a PDU session and may control the handling of the PDU session by the selected UPF by providing rules for packet handling (PDR, FAR, QER, etc.). Rules relating to QoS and / or charging for a particular PDU session may be obtained from PCF 320 and provided to UPF 305.

[0065] The PCF 320 may provide, to other NFs, services relating to policy rules. The PCF 320 may use subscription data and information about network conditions to determine policy rules and then provide the policy rules to a particular NF which may be responsible for enforcement of those rules. Policy rules may relate to policy control for access and mobility, and may be enforced by the AMF. Policy rules may relate to session management, and may be enforced by the SMF 314. Policy rules may be, for example, network-specific, wireless device-specific, session-specific, or data flow-specific.

[0066] The NRF 330 may provide service discovery. The NRF 330 may belong to a particular PLMN. The NRF 330 may maintain NF profiles relating to other NFs in the communication network 300. The NF profile may include, for example, an address, PLMN, and / or type of the NF, a slice identifier, a list of the one or more services provided by the NF, and the authorization required to access the services.

[0067] The NEF 340 depicted in FIG. 3 may provide an interface to external domains, permitting external domains to selectively access the control plane of the communication network 300. The external domain may comprise, for example, third-party network functions, application functions, etc. The NEF 340 may act as a proxy between external elements and network functions such as AMF 312, SMF 314, PCF 320, UDM 350, etc. As an example, NEF 340 may determine a location or reachability status of UE 301 based on reports from AMF 312, and provide status information to an external element. As an example, an external element may provide, via NEF 340, information that facilitates the setting of parameters for establishment of a PDU session. The NEF 340 may determine which data and capabilities of the control plane are exposed to the external domain. The NEF 340 may provide secure exposure that authenticates and / or authorizes an external entity to which data or capabilities of the communication network 300 are exposed. The NEF 340 may selectively control the exposure such that the internal architecture of the core network is hidden from the external domain.

[0068] The UDM 350 may provide data storage for other NFs. The UDM 350 may permit a consolidated view of network information that may be used to ensure that the most relevant information can be made available to different NFs from a single resource. The UDM 350 may store and / or retrieve information from a unified data repository (UDR). For example, UDM 350 may obtain user subscription data relating to UE 301 from the UDR.

[0069] The AUSF 360 may support mutual authentication of UE 301 by the core network and authentication of the core network by UE 301. The AUSF 360 may perform key agreement procedures and provide keying material that can be used to improve security.

[0070] The NSSF 370 may select one or more network slices to be used by the UE 301. The NSSF 370 may select a slice based on slice selection information. For example, the NSSF 370 may receive Single Network Slice Selection Assistance Information (S-NSSAI) and map the S-NSSAI to a network slice instance identifier (NSI).

[0071] The CHF 380 may control billing-related tasks associated with UE 301. For example, UPF 305 may report traffic usage associated with UE 301 to SMF 314. The SMF 314 may collect usage data from UPF 305 and one or more other UPFs. The usage data may indicate how much data is exchanged, what DN the data is exchanged with, a network slice associated with the data, or any other information that may influence billing. The SMF 314 may share thecollected usage data with the CHF. The CHF may use the collected usage data to perform billing-related tasks associated with UE 301. The CHF may, depending on the billing status of UE 301, instruct SMF 314 to limit or influence access of UE 301 and / or to provide billing-related notifications to UE 301.

[0072] The NWDAF 390 may collect and analyze data from other network functions and offer data analysis services to other network functions. As an example, NWDAF 390 may collect data relating to a load level for a particular network slice instance from UPF 305, AMF 312, and / or SMF 314. Based on the collected data, NWDAF 390 may provide load level data to the PCF 320 and / or NSSF 370, and / or notify the PC220 and / or NSSF 370 if load level for a slice reaches and / or exceeds a load level threshold.

[0073] The AF 399 may be outside the core network, but may interact with the core network to provide information relating to the QoS requirements or traffic routing preferences associated with a particular application. The AF 399 may access the core network based on the exposure constraints imposed by the NEF 340. However, an operator of the core network may consider the AF 399 to be a trusted domain that can access the network directly.

[0074] FIGS. 4A, 4B, and 5 illustrate other examples of core network architectures that are analogous in some respects to the core network architecture 300 depicted in FIG. 3. For conciseness, some of the core network elements depicted in FIG. 3 are omitted. Many of the elements depicted in FIGS. 4A, 4B, and 5 are analogous in some respects to elements depicted in FIG. 3. For conciseness, some of the details relating to their functions or operation are omitted.

[0075] FIG. 4A illustrates an example of a core network architecture 400A comprising an arrangement of multiple UPFs. Core network architecture 400A includes a UE 401, an AN 402, an AMF 412, and an SMF 414. Unlike previous examples of core network architectures described above, FIG. 4A depicts multiple UPFs, including a UPF 405, a UPF 406, and a UPF 407, and multiple DNs, including a DN 408 and a DN 409. Each of the multiple UPFs 405, 406, 407 may communicate with the SMF 414 via an N4 interface. The DNs 408, 409 communicate with the UPFs 405, 406, respectively, via N6 interfaces. As shown in FIG. 4A, the multiple UPFs 405, 406, 407 may communicate with one another via N9 interfaces.

[0076] The UPFs 405, 406, 407 may perform traffic detection, in which the UPFs identify and / or classify packets. Packet identification may be performed based on packet detection rules (PDR) provided by the SMF 414. A PDR may include packet detection information comprising one or more of: a source interface, a UE IP address, core network (ON) tunnel information (e.g., a ON address of an N3 / N9 tunnel corresponding to a PDU session), a network instance identifier, a quality of service flow identifier (QFI), a filter set (for example, an IP packet filter set or an ethernet packet filter set), and / or an application identifier.

[0077] In addition to indicating how a particular packet is to be detected, a PDR may further indicate rules for handling the packet upon detection thereof. The rules may include, for example, forwarding action rules (FARs), multiaccess rules (MARs), usage reporting rules (URRs), QoS enforcement rules (QERs), etc. For example, the PDR may comprise one or more FAR identifiers, MAR identifiers, URR identifiers, and / or QER identifiers. These identifiers may indicate the rules that are prescribed for the handling of a particular detected packet.

[0078] The UPF 405 may perform traffic forwarding in accordance with a FAR. For example, the FAR may indicatethat a packet associated with a particular PDR is to be forwarded, duplicated, dropped, and / or buffered. The FAR may indicate a destination interface, for example, “access” for downlink or “core” for uplink. If a packet is to be buffered, the FAR may indicate a buffering action rule (BAR). As an example, UPF 405 may perform data buffering of a certain number of downlink packets if a PDU session is deactivated.

[0079] The UPF 405 may perform QoS enforcement in accordance with a QER. For example, the QER may indicate a guaranteed bitrate that is authorized and / or a maximum bitrate to be enforced for a packet associated with a particular PDR. The QER may indicate that a particular guaranteed and / or maximum bitrate may be for uplink packets and / or downlink packets. The UPF 405 may mark packets belonging to a particular QoS flow with a corresponding QFI. The marking may enable a recipient of the packet to determine a QoS of the packet.

[0080] The UPF 405 may provide usage reports to the SMF 414 in accordance with a URR. The URR may indicate one or more triggering conditions for generation and reporting of the usage report, for example, immediate reporting, periodic reporting, a threshold for incoming uplink traffic, or any other suitable triggering condition. The URR may indicate a method for measuring usage of network resources, for example, data volume, duration, and / or event.

[0081] As noted above, the DNs 408, 409 may comprise public DNs (e.g., the Internet), private DNs (e.g., private, internal corporate-owned DNs), and / or intra-operator DNs. Each DN may provide an operator service and / or a third- party service. The service provided by a DN may be the Internet, an IP multimedia subsystem (IMS), an augmented or virtual reality network, an edge computing or mobile edge computing (MEC) network, etc. Each DN may be identified using a data network name (DNN). The UE 401 may be configured to establish a first logical connection with DN 408 (a first PDU session), a second logical connection with DN 409 (a second PDU session), or both simultaneously (first and second PDU sessions).

[0082] Each PDU session may be associated with at least one UPF configured to operate as a PDU session anchor (PSA, or “anchor”). The anchor may be a UPF that provides an N6 interface with a DN.

[0083] In the example of FIG. 4A, UPF 405 may be the anchor for the first PDU session between UE 401 and DN 408, whereas the UPF 406 may be the anchor for the second PDU session between UE 401 and DN 409. The core network may use the anchor to provide service continuity of a particular PDU session (for example, IP address continuity) as UE 401 moves from one access network to another. For example, suppose that UE 401 establishes a PDU session using a data path to the DN 408 using an access network other than AN 402. The data path may include UPF 405 acting as anchor. Suppose further that the UE 401 later moves into the coverage area of the AN 402. In such a scenario, SMF 414 may select a new UPF (UPF 407) to bridge the gap between the newly-entered access network (AN 402) and the anchor UPF (UPF 405). The continuity of the PDU session may be preserved as any number of UPFs are added or removed from the data path. When a UPF is added to a data path, as shown in FIG. 4A, it may be described as an intermediate UPF and / or a cascaded UPF.

[0084] As noted above, UPF 406 may be the anchor for the second PDU session between UE 401 and DN 409. Although the anchor for the first and second PDU sessions are associated with different UPFs in FIG. 4A, it will be understood that this is merely an example. It will also be understood that multiple PDU sessions with a single DN maycorrespond to any number of anchors. When there are multiple UP Fs, a UPF at the branching point (UPF 407 in FIG. 4A) may operate as an uplink classifier (UL-CL). The UL-CL may divert uplink user plane traffic to different UPFs.

[0085] The SMF 414 may allocate, manage, and / or assign an IP address to UE 401, for example, upon establishment of a PDU session. The SMF 414 may maintain an internal pool of IP addresses to be assigned. The SMF 414 may, if necessary, assign an IP address provided by a dynamic host configuration protocol (DHCP) server or an authentication, authorization, and accounting (AAA) server. IP address management may be performed in accordance with a session and service continuity (SSC) mode. In SSC mode 1, an IP address of UE 401 may be maintained (and the same anchor UPF may be used) as the wireless device moves within the network. In SSC mode 2, the IP address of UE 401 changes as UE 401 moves within the network (e.g., the old IP address and UPF may be abandoned and a new IP address and anchor UPF may be established). In SSC mode 3, it may be possible to maintain an old IP address (similar to SSC mode 1) temporarily while establishing a new IP address (similar to SSC mode 2), thus combining features of SSC modes 1 and 2. Applications that are sensitive to IP address changes may operate in accordance with SSC mode 1.

[0086] UPF selection may be controlled by SMF 414. For example, upon establishment and / or modification of a PDU session between UE 401 and DN 408, SMF 414 may select UPF 405 as the anchor for the PDU session and / or UPF 407 as an intermediate UPF. Criteria for UPF selection include path efficiency and / or speed between AN 402 and DN 408. The reliability, load status, location, slice support and / or other capabilities of candidate UPFs may also be considered.

[0087] FIG. 4B illustrates an example of a core network architecture 400B that accommodates untrusted access. Similar to FIG. 4A, UE 401 as depicted in FIG. 4B connects to DN 408 via AN 402 and UPF 405. The AN 402 and UPF 405 constitute trusted (e.g., 3GPP) access to the DN 408. By contrast, UE 401 may also access DN 408 using an untrusted access network, AN 403, and a non-3GPP interworking function (N3IWF) 404.

[0088] The AN 403 may be, for example, a wireless land area network (WLAN) operating in accordance with the IEEE 802.11 standard. The UE 401 may connect to AN 403, via an interface Y1, in whatever manner is prescribed for AN 403. The connection to AN 403 may or may not involve authentication. The UE 401 may obtain an IP address from AN 403. The UE 401 may determine to connect to core network 400B and select untrusted access for that purpose. The AN 403 may communicate with N3IWF 404 via a Y2 interface. After selecting untrusted access, the UE 401 may provide N3IWF 404 with sufficient information to select an AMF. The selected AMF may be, for example, the same AMF that is used by UE 401 for 3GPP access (AMF 412 in the present example). The N3IWF 404 may communicate with AMF 412 via an N2 interface. The UPF 405 may be selected and N3IWF 404 may communicate with UPF 405 via an N3 interface. The UPF 405 may be a PDU session anchor (PSA) and may remain the anchor for the PDU session even as UE 401 shifts between trusted access and untrusted access.

[0089] FIG. 5 illustrates an example of a core network architecture 500 in which a UE 501 is in a roaming scenario. In a roaming scenario, UE 501 is a subscriber of a first PLMN (a home PLMN, or HPLMN) but attaches to a second PLMN (a visited PLMN, or VPLMN). Core network architecture 500 includes UE 501 , an AN 502, a UPF 505, and a DN 508.The AN 502 and UPF 505 may be associated with a VPLMN. The VPLMN may manage the AN 502 and UPF 505 using core network elements associated with the VPLMN, including an AMF 512, an SMF 514, a PCF 520, an NRF 530, an NEF 540, and an NSSF 570. An AF 599 may be adjacent the core network of the VPLMN.

[0090] The UE 501 may not be a subscriber of the VPLMN. The AMF 512 may authorize UE 501 to access the network based on, for example, roaming restrictions that apply to UE 501. In order to obtain network services provided by the VPLMN, it may be necessary for the core network of the VPLMN to interact with core network elements of a HPLMN of UE 501, in particular, a PCF 521, an NRF 531, an NEF 541, a UDM 551, and / or an AUSF 561. The VPLMN and HPLMN may communicate using an N32 interface connecting respective security edge protection proxies (SEPPs). In FIG. 5, the respective SEPPs are depicted as a VSEPP 590 and an HSEPP 591.

[0091] The VSEPP 590 and the HSEPP 591 communicate via an N32 interface for defined purposes while concealing information about each PLMN from the other. The SEPPs may apply roaming policies based on communications via the N32 interface. The PCF 520 and PCF 521 may communicate via the SEPPs to exchange policy-related signaling. The NRF 530 and NRF 531 may communicate via the SEPPs to enable service discovery of NFs in the respective PLMNs. The VPLMN and HPLMN may independently maintain NEF 540 and NEF 541. The NSSF 570 and NSSF 571 may communicate via the SEPPs to coordinate slice selection for UE 501. The HPLMN may handle all authentication and subscription related signaling. For example, when the UE 501 registers or requests service via the VPLMN, the VPLMN may authenticate UE 501 and / or obtain subscription data of UE 501 by accessing, via the SEPPs, the UDM 551 and AUSF 561 of the HPLMN.

[0092] The core network architecture 500 depicted in FIG. 5 may be referred to as a local breakout configuration, in which UE 501 accesses DN 508 using one or more UPFs of the VPLMN (i.e., UPF 505). However, other configurations are possible. For example, in a home-routed configuration (not shown in FIG. 5), UE 501 may access a DN using one or more UPFs of the HPLMN. In the home-routed configuration, an N9 interface may run parallel to the N32 interface, crossing the frontier between the VPLMN and the HPLMN to carry user plane data. One or more SMFs of the respective PLMNs may communicate via the N32 interface to coordinate session management for UE 501. The SMFs may control their respective UPFs on either side of the frontier.

[0093] FIG. 6 illustrates an example of network slicing. Network slicing may refer to division of shared infrastructure (e.g., physical infrastructure) into distinct logical networks. These distinct logical networks may be independently controlled, isolated from one another, and / or associated with dedicated resources.

[0094] Network architecture 600A illustrates an un-sliced physical network corresponding to a single logical network. The network architecture 600A comprises a user plane wherein UEs 601 A, 601 B, 6010 (collectively, UEs 601) have a physical and logical connection to a DN 608 via an AN 602 and a UPF 605. The network architecture 600A comprises a control plane wherein an AMF 612 and a SMF 614 control various aspects of the user plane.

[0095] The network architecture 600A may have a specific set of characteristics (e.g., relating to maximum bit rate, reliability, latency, bandwidth usage, power consumption, etc.). This set of characteristics may be affected by the nature of the network elements themselves (e.g., processing power, availability of free memory, proximity to other networkelements, etc.) or the management thereof (e.g. , optimized to maximize bit rate or reliability, reduce latency or power bandwidth usage, etc.). The characteristics of network architecture 600A may change over time, for example, by upgrading equipment or by modifying procedures to target a particular characteristic. However, at any given time, network architecture 600A will have a single set of characteristics that may or may not be optimized for a particular use case. For example, UEs 601 A, 601 B, 6010 may have different requirements, but network architecture 600A can only be optimized for one of the three.

[0096] Network architecture 600B is an example of a sliced physical network divided into multiple logical networks. In FIG. 6, the physical network is divided into three logical networks, referred to as slice A, slice B, and slice 0. For example, UE 601 A may be served by AN 602A, UPF 605A, AMF 612, and SMF 614A. UE 601 B may be served by AN 602B, UPF 605B, AMF 612, and SMF 614B. UE 6010 may be served by AN 6020, UPF 6050, AMF 612, and SMF 6140. Although the respective UEs 601 communicate with different network elements from a logical perspective, these network elements may be deployed by a network operator using the same physical network elements.

[0097] Each network slice may be tailored to network services having different sets of characteristics. For example, slice A may correspond to enhanced mobile broadband (eMBB) service. Mobile broadband may refer to internet access by mobile users, commonly associated with smartphones. Slice B may correspond to ultra-reliable low-latency communication (URLLO), which focuses on reliability and speed. Relative to eMBB, URLLO may improve the feasibility of use cases such as autonomous driving and telesurgery. Slice C may correspond to massive machine type communication (mMTC), which focuses on low-power services delivered to a large number of users. For example, slice C may be optimized for a dense network of battery-powered sensors that provide small amounts of data at regular intervals. Many mMTC use cases would be prohibitively expensive if they operated using an eMBB or URLLO network.

[0098] If the service requirements for one of the UEs 601 changes, then the network slice serving that UE can be updated to provide better service. Moreover, the set of network characteristics corresponding to eMBB, URLLO, and mMTC may be varied, such that differentiated species of eMBB, URLLC, and mMTC are provided. Alternatively, network operators may provide entirely new services in response to, for example, customer demand.

[0099] In FIG. 6, each of the UEs 601 has its own network slice. However, it will be understood that a single slice may serve any number of UEs and a single UE may operate using any number of slices. Moreover, in the example network architecture 600B, the AN 602, UPF 605 and SMF 614 are separated into three separate slices, whereas the AMF 612 is unsliced. However, it will be understood that a network operator may deploy any architecture that selectively utilizes any mix of sliced and unsliced network elements, with different network elements divided into different numbers of slices. Although FIG. 6 only depicts three core network functions, it will be understood that other core network functions may be sliced as well. A PLMN that supports multiple network slices may maintain a separate network repository function (NFR) for each slice, enabling other NFs to discover network services associated with that slice.

[0100] Network slice selection may be controlled by an AMF, or alternatively, by a separate network slice selection function (NSSF). For example, a network operator may define and implement distinct network slice instances (NSIs).Each NSI may be associated with single network slice selection assistance information (S-NSSAI). The S-NSSAI may include a particular slice / service type (SST) indicator (indicating eMBB, URLLO, mMTC, etc.). As an example, a particular tracking area may be associated with one or more configured S-NSSAIs. UEs may identify one or more requested and / or subscribed S-NSSAIs (e.g., during registration). The network may indicate to the UE one or more allowed and / or rejected S-NSSAIs.

[0101] The S-NSSAI may further include a slice differentiator (SD) to distinguish between different tenants of a particular slice and / or service type. For example, a tenant may be a customer (e.g., vehicle manufacture, service provider, etc.) of a network operator that obtains (for example, purchases) guaranteed network resources and / or specific policies for handling its subscribers. The network operator may configure different slices and / or slice types, and use the SD to determine which tenant is associated with a particular slice.

[0102] FIG. 7A, FIG. 7B, and FIG. 70 illustrate a user plane (UP) protocol stack, a control plane (CP) protocol stack, and services provided between protocol layers of the UP protocol stack.

[0103] The layers may be associated with an open system interconnection (OSI) model of computer networking functionality. In the OSI model, layer 1 may correspond to the bottom layer, with higher layers on top of the bottom layer. Layer 1 may correspond to a physical layer, which is concerned with the physical infrastructure used for transfer of signals (for example, cables, fiber optics, and / or radio frequency transceivers). In New Radio (NR), layer 1 may comprise a physical layer (PHY). Layer 2 may correspond to a data link layer. Layer 2 may be concerned with packaging of data (into, e.g., data frames) for transfer, between nodes of the network, using the physical infrastructure of layer 1. In NR, layer 2 may comprise a media access control layer (MAC), a radio link control layer (RLC), a packet data convergence layer (PDCP), and a service data application protocol layer (SDAP).

[0104] Layer 3 may correspond to a network layer. Layer 3 may be concerned with routing of the data which has been packaged in layer 2. Layer 3 may handle prioritization of data and traffic avoidance. In NR, layer 3 may comprise a radio resource control layer (RRC) and a non-access stratum layer (NAS). Layers 4 through 7 may correspond to a transport layer, a session layer, a presentation layer, and an application layer. The application layer interacts with an end user to provide data associated with an application. In an example, an end user implementing the application may generate data associated with the application and initiate sending of that information to a targeted data network (e.g., the Internet, an application server, etc.). Starting at the application layer, each layer in the OSI model may manipulate and / or repackage the information and deliver it to a lower layer. At the lowest layer, the manipulated and / or repackaged information may be exchanged via physical infrastructure (for example, electrically, optically, and / or electromagnetically). As it approaches the targeted data network, the information will be unpackaged and provided to higher and higher layers, until it once again reaches the application layer in a form that is usable by the targeted data network (e.g., the same form in which it was provided by the end user). To respond to the end user, the data network may perform this procedure in reverse.

[0105] FIG. 7A illustrates a user plane protocol stack. The user plane protocol stack may be a new radio (NR) protocol stack for a Uu interface between a UE 701 and a gNB 702. In layer 1 of the UP protocol stack, the UE 701 mayimplement PHY 731 and the g N B 702 may implement PHY 732. In layer 2 of the UP protocol stack, the UE 701 may implement MAC 741 , RLC 751 , PDCP 761 , and SDAP 771. The g N B 702 may implement MAC 742, RLC 752, PDCP 762, and SDAP 772.

[0106] FIG. 7B illustrates a control plane protocol stack. The control plane protocol stack may be an NR protocol stack for the Uu interface between the UE 701 and the gNB 702 and / or an N1 interface between the UE 701 and an AMF 712. In layer 1 of the CP protocol stack, the UE 701 may implement PHY 731 and the gNB 702 may implement PHY 732. In layer 2 of the CP protocol stack, the UE 701 may implement MAC 741, RLC 751, PDCP 761, RRC 781, and NAS 791. The gNB 702 may implement MAC 742, RLC 752, PDCP 762, and RRC 782. The AMF 712 may implement NAS 792.

[0107] The NAS may be concerned with the non-access stratum, in particular, communication between the UE 701 and the core network (e.g., the AMF 712). Lower layers may be concerned with the access stratum, for example, communication between the UE 701 and the gNB 702. Messages sent between the UE 701 and the core network may be referred to as NAS messages. In an example, a NAS message may be relayed by the gNB 702, but the content of the NAS message (e.g., information elements of the NAS message) may not be visible to the gNB 702.

[0108] FIG. 7C illustrates an example of services provided between protocol layers of the NR user plane protocol stack illustrated in FIG. 7A. The UE 701 may receive services through a PDU session, which may be a logical connection between the UE 701 and a data network (DN). The UE 701 and the DN may exchange data packets associated with the PDU session. The PDU session may comprise one or more quality of service (QoS) flows. SDAP 771 and SDAP 772 may perform mapping and / or demapping between the one or more QoS flows of the PDU session and one or more radio bearers (e.g., data radio bearers). The mapping between the QoS flows and the data radio bearers may be determined in the SDAP 772 by the gNB 702, and the UE 701 may be notified of the mapping (e.g., based on control signaling and / or reflective mapping). For reflective mapping, the SDAP 772 of the gNB 220 may mark downlink packets with a QoS flow indicator (QFI) and deliver the downlink packets to the UE 701. The UE 701 may determine the mapping based on the QFI of the downlink packets.

[0109] PDCP 761 and PDCP 762 may perform header compression and / or decompression. Header compression may reduce the amount of data transmitted over the physical layer. The PDCP 761 and PDCP 762 may perform ciphering and / or deciphering. Ciphering may reduce unauthorized decoding of data transmitted over the physical layer (e.g., intercepted on an air interface), and protect data integrity (e.g., to ensure control messages originate from intended sources). The PDCP 761 and PDCP 762 may perform retransmissions of undelivered packets, in-sequence delivery and reordering of packets, duplication of packets, and / or identification and removal of duplicate packets. In a dual connectivity scenario, PDCP 761 and PDCP 762 may perform mapping between a split radio bearer and RLC channels.

[0110] RLC 751 and RLC 752 may perform segmentation, retransmission through Automatic Repeat Request (ARQ). The RLC 751 and RLC 752 may perform removal of duplicate data units received from MAC 741 and MAC 742, respectively. The RLCs 213 and 223 may provide RLC channels as a service to PDCPs 214 and 224, respectively.

[0111] MAC 741 and MAC 742 may perform multiplexing and / or demultiplexing of logical channels. MAC 741 and MAC 742 may map logical channels to transport channels. In an example, UE 701 may, in MAC 741, multiplex data units of one or more logical channels into a transport block. The UE 701 may transmit the transport block to the g N B 702 using PHY 731. The g N B 702 may receive the transport block using PHY 732 and demultiplex data units of the transport blocks back into logical channels. MAC 741 and MAC 742 may perform error correction through Hybrid Automatic Repeat Request (HARQ), logical channel prioritization, and / or padding.

[0112] PHY 731 and PHY 732 may perform mapping of transport channels to physical channels. PHY 731 and PHY 732 may perform digital and analog signal processing functions (e.g., coding / decoding and modulation / demodulation) for sending and receiving information (e.g., transmission via an air interface). PHY 731 and PHY 732 may perform multi-antenna mapping.

[0113] FIG. 8 illustrates an example of a quality of service (QoS) model for differentiated data exchange. In the QoS model of FIG. 8, there are a UE 801, a AN 802, and a UPF 805. The QoS model facilitates prioritization of certain packet or protocol data units (PDUs), also referred to as packets. For example, higher-priority packets may be exchanged faster and / or more reliably than lower-priority packets. The network may devote more resources to exchange of high-QoS packets.

[0114] In the example of FIG. 8, a PDU session 810 is established between UE 801 and UPF 805. The PDU session 810 may be a logical connection enabling the UE 801 to exchange data with a particular data network (for example, the Internet). The UE 801 may request establishment of the PDU session 810. At the time that the PDU session 810 is established, the UE 801 may, for example, identify the targeted data network based on its data network name (DNN). The PDU session 810 may be managed, for example, by a session management function (SMF, not shown). In order to facilitate exchange of data associated with the PDU session 810, between the UE 801 and the data network, the SMF may select the UPF 805 (and optionally, one or more other UPFs, not shown).

[0115] One or more applications associated with UE 801 may generate uplink packets 812A-812E associated with the PDU session 810. In order to work within the QoS model, UE 801 may apply QoS rules 814 to uplink packets 812A- 812E. The QoS rules 814 may be associated with PDU session 810 and may be determined and / or provided to the UE 801 when PDU session 810 is established and / or modified. Based on QoS rules 814, UE 801 may classify uplink packets 812A-812E, map each of the uplink packets 812A-812E to a QoS flow, and / or mark uplink packets 812A-812E with a QoS flow indicator (QFI). As a packet travels through the network, and potentially mixes with other packets from other UEs having potentially different priorities, the QFI indicates how the packet should be handled in accordance with the QoS model. In the present illustration, uplink packets 812A, 812B are mapped to QoS flow 816A, uplink packet 812C is mapped to QoS flow 816B, and the remaining packets are mapped to QoS flow 816C.

[0116] The QoS flows may be the finest granularity of QoS differentiation in a PDU session. In the figure, three QoS flows 816A-816C are illustrated. However, it will be understood that there may be any number of QoS flows. Some QoS flows may be associated with a guaranteed bit rate (GBR QoS flows) and others may have bit rates that are not guaranteed (non-GBR QoS flows). QoS flows may also be subject to per-UE and per-session aggregate bit rates. Oneof the QoS flows may be a default QoS flow. The QoS flows may have different priorities. For example, QoS flow 816A may have a higher priority than QoS flow 816B, which may have a higher priority than QoS flow 816C. Different priorities may be reflected by different QoS flow characteristics. For example, QoS flows may be associated with flow bit rates. A particular QoS flow may be associated with a guaranteed flow bit rate (GFBR) and / or a maximum flow bit rate (MFBR). QoS flows may be associated with specific packet delay budgets (PDBs), packet error rates (PERs), and / or maximum packet loss rates. QoS flows may also be subject to per-UE and per-session aggregate bit rates.

[0117] In order to work within the QoS model, UE 801 may apply resource mapping rules 818 to the QoS flows 816A- 816C. The air interface between UE 801 and AN 802 may be associated with resources 820. In the present illustration, QoS flow 816A is mapped to resource 820A, whereas QoS flows 816B, 816C are mapped to resource 820B. The resource mapping rules 818 may be provided by the AN 802. In order to meet QoS requirements, the resource mapping rules 818 may designate more resources for relatively high-priority QoS flows. With more resources, a high- priority QoS flow such as QoS flow 816A may be more likely to obtain the high flow bit rate, low packet delay budget, or other characteristic associated with QoS rules 814. The resources 820 may comprise, for example, radio bearers. The radio bearers (e.g., data radio bearers) may be established between the UE 801 and the AN 802. The radio bearers in 5G, between the UE 801 and the AN 802, may be distinct from bearers in LTE, for example, Evolved Packet System (EPS) bearers between a UE and a packet data network gateway (PGW), S1 bearers between an eNB and a serving gateway (SGW), and / or an S5 / S8 bearer between an SGW and a PGW.

[0118] Once a packet associated with a particular QoS flow is received at AN 802 via resource 820A or resource 820B, AN 802 may separate packets into respective QoS flows 856A-856O based on QoS profiles 828. The QoS profiles 828 may be received from an SMF. Each QoS profile may correspond to a QFI, for example, the QFI marked on the uplink packets 812A-812E. Each QoS profile may include QoS parameters such as 5G QoS identifier (5QI) and an allocation and retention priority (ARP). The QoS profile for non-GBR QoS flows may further include additional QoS parameters such as a reflective QoS attribute (RQA).The QoS profile for GBR QoS flows may further include additional QoS parameters such as a guaranteed flow bit rate (GFBR), a maximum flow bit rate (MFBR), and / or a maximum packet loss rate. The 5QI may be a standardized 5QI which has one-to-one mapping to a standardized combination of 5G QoS characteristics per well-known services. The 5QI may be a dynamically assigned 5QI which the standardized 5QI values are not defined. The 5QI may represent 5G QoS characteristics. The 5QI may comprise a resource type, a default priority level, a packet delay budget (PDB), a packet error rate (PER), a maximum data burst volume, and / or an averaging window. The resource type may indicate a non-GBR QoS flow, a GBR QoS flow or a delay-critical GBR QoS flow. The averaging window may represent a duration over which the GFBR and / or MFBR is calculated. ARP may be a priority level comprising pre-emption capability and a pre-emption vulnerability. Based on the ARP, the AN 802 may apply admission control for the QoS flows in a case of resource limitations.

[0119] The AN 802 may select one or more N3 tunnels 850 for transmission of the QoS flows 856A-856C. After the packets are divided into QoS flows 856A-856C, the packet may be sent to UPF 805 (e.g., towards a DN) via the selected one or more N3 tunnels 850. The UPF 805 may verify that the QFIs of the uplink packets 812A-812E arealigned with the QoS rules 814 provided to the UE 801. The UPF 805 may measure and / or count packets and / or provide packet metrics to, for example, a POF.

[0120] The figure also illustrates a process for downlink. In particular, one or more applications may generate downlink packets 852A-852E. The UPF 805 may receive downlink packets 852A-852E from one or more DNs and / or one or more other UPFs. As per the QoS model, UPF 805 may apply packet detection rules (PDRs) 854 to downlink packets 852A-852E. Based on PDRs 854, UPF 805 may map packets 852A-852E into QoS flows. In the present illustration, downlink packets 852A, 852B are mapped to QoS flow 856A, downlink packet 852C is mapped to QoS flow 856B, and the remaining packets are mapped to QoS flow 856C.

[0121] The QoS flows 856A-856C may be sent to AN 802. The AN 802 may apply resource mapping rules to the QoS flows 856A-856C. In the present illustration, QoS flow 856A is mapped to resource 820A, whereas QoS flows 856B, 856C are mapped to resource 820B. In order to meet QoS requirements, the resource mapping rules may designate more resources to high-priority QoS flows.

[0122] FIGS. 9A- 9D illustrate example states and state transitions of a wireless device (e.g., a UE). At any given time, the wireless device may have a radio resource control (RRC) state, a registration management (RM) state, and a connection management (CM) state.

[0123] FIG. 9A is an example diagram showing RRC state transitions of a wireless device (e.g., a UE). The UE may be in one of three RRC states: RRC idle 910, (e.g., RRCJDLE), RRC inactive 920 (e.g., RRC -INACTIVE), or RRC connected 930 (e.g., RRC -CONNECTED). The UE may implement different RAN-related control-plane procedures depending on its RRC state. Other elements of the network, for example, a base station, may track the RRC state of one or more UEs and implement RAN-related control-plane procedures appropriate to the RRC state of each.

[0124] In RRC connected 930, it may be possible for the UE to exchange data with the network (for example, the base station). The parameters necessary for exchange of data may be established and known to both the UE and the network. The parameters may be referred to and / or included in an RRC context of the UE (sometimes referred to as a UE context). These parameters may include, for example: one or more AS contexts; one or more radio link configuration parameters; bearer configuration information (e.g., relating to a data radio bearer, signaling radio bearer, logical channel, QoS flow, and / or PDU session); security information; and / or PHY, MAC, RLC, PDCP, and / or SDAP layer configuration information. The base station with which the UE is connected may store the RRC context of the UE.

[0125] While in RRC connected 930, mobility of the UE may be managed by the access network, whereas the UE itself may manage mobility while in RRC idle 910 and / or RRC inactive 920. While in RRC connected 930, the UE may manage mobility by measuring signal levels (e.g., reference signal levels) from a serving cell and neighboring cells and reporting these measurements to the base station currently serving the UE. The network may initiate handover based on the reported measurements. The RRC state may transition from RRC connected 930 to RRC idle 910 through a connection release procedure 930 or to RRC inactive 920 through a connection inactivation procedure 932.

[0126] In RRC idle 910, an RRC context may not be established for the UE. In RRC idle 910, the UE may not have an RRC connection with a base station. While in RRC idle 910, the UE may be in a sleep state for a majority of the time(e.g., to conserve battery power). The UE may wake up periodically (e.g., once in every discontinuous reception cycle) to monitor for paging messages from the access network. Mobility of the UE may be managed by the UE through a procedure known as cell reselection. The RRC state may transition from RRC idle 910 to RRC connected 930 through a connection establishment procedure 913, which may involve a random access procedure, as discussed in greater detail below.

[0127] In RRC inactive 920, the RRC context previously established is maintained in the UE and the base station. This may allow for a fast transition to RRC connected 930 with reduced signaling overhead as compared to the transition from RRC idle 910 to RRC connected 930. The RRC state may transition to RRC connected 930 through a connection resume procedure 923. The RRC state may transition to RRC idle 910 though a connection release procedure 921 that may be the same as or similar to connection release procedure 931.

[0128] An RRC state may be associated with a mobility management mechanism. In RRC idle 910 and RRC inactive 920, mobility may be managed by the UE through cell reselection. The purpose of mobility management in RRC idle 910 and / or RRC inactive 920 is to allow the network to be able to notify the UE of an event via a paging message without having to broadcast the paging message over the entire mobile communications network. The mobility management mechanism used in RRC idle 910 and / or RRC inactive 920 may allow the network to track the UE on a cell-group level so that the paging message may be broadcast over the cells of the cell group that the UE currently resides within instead of the entire communication network. Tracking may be based on different granularities of grouping. For example, there may be three levels of cell-grouping granularity: individual cells; cells within a RAN area identified by a RAN area identifier (RAI); and cells within a group of RAN areas, referred to as a tracking area and identified by a tracking area identifier (TAI).

[0129] T racking areas may be used to track the UE at the CN level. The CN may provide the UE with a list of TAIs associated with a UE registration area. If the UE moves, through cell reselection, to a cell associated with a TAI not included in the list of TAIs associated with the UE registration area, the UE may perform a registration update with the CN to allow the CN to update the UE’s location and provide the UE with a new the UE registration area.

[0130] RAN areas may be used to track the UE at the RAN level. For a UE in RRC inactive 920 state, the UE may be assigned a RAN notification area. A RAN notification area may comprise one or more cell identities, a list of RAIs, and / or a list of TAIs. In an example, a base station may belong to one or more RAN notification areas. In an example, a cell may belong to one or more RAN notification areas. If the UE moves, through cell reselection, to a cell not included in the RAN notification area assigned to the UE, the UE may perform a notification area update with the RAN to update the UE’s RAN notification area.

[0131] A base station storing an RRC context for a UE or a last serving base station of the UE may be referred to as an anchor base station. An anchor base station may maintain an RRC context for the UE at least during a period of time that the UE stays in a RAN notification area of the anchor base station and / or during a period of time that the UE stays in RRC inactive 920.

[0132] FIG. 9B is an example diagram showing registration management (RM) state transitions of a wireless device(e.g., a UE). The states are RM deregistered 940, (e.g., RM-DEREGISTERED) and RM registered 950 (e.g., RM- REGISTERED).

[0133] In RM deregistered 940, the UE is not registered with the network, and the UE is not reachable by the network. In order to be reachable by the network, the UE must perform an initial registration. As an example, the UE may register with an AMF of the network. If registration is rejected (registration reject 944), then the UE remains in RM deregistered 940. If registration is accepted (registration accept 945), then the UE transitions to RM registered 950. While the UE is RM registered 950, the network may store, keep, and / or maintain a UE context for the UE. The UE context may be referred to as wireless device context. The UE context corresponding to network registration (maintained by the core network) may be different from the RRC context corresponding to RRC state (maintained by an access network, .e.g., a base station). The UE context may comprise a UE identifier and a record of various information relating to the UE, for example, UE capability information, policy information for access and mobility management of the UE, lists of allowed or established slices or PDU sessions, and / or a registration area of the UE (i.e., a list of tracking areas covering the geographical area where the wireless device is likely to be found).

[0134] While the UE is RM registered 950, the network may store the UE context of the UE, and if necessary, use the UE context to reach the UE. Moreover, some services may not be provided by the network unless the UE is registered. The UE may update its UE context while remaining in RM registered 950 (registration update accept 955). For example, if the UE leaves one tracking area and enters another tracking area, the UE may provide a tracking area identifier to the network. The network may deregister the UE, or the UE may deregister itself (deregistration 954). For example, the network may automatically deregister the wireless device if the wireless device is inactive for a certain amount of time. Upon deregistration, the UE may transition to RM deregistered 940.

[0135] FIG. 90 is an example diagram showing connection management (CM) state transitions of a wireless device (e.g., a UE), shown from a perspective of the wireless device. The UE may be in CM idle 960 (e.g., CM-IDLE) or CM connected 970 (e.g., CM-CONNECTED).

[0136] In CM idle 960, the UE does not have a non access stratum (NAS) signaling connection with the network. As a result, the UE cannot communicate with core network functions. The UE may transition to CM connected 970 by establishing an AN signaling connection (AN signaling connection establishment 967). This transition may be initiated by sending an initial NAS message. The initial NAS message may be a registration request (e.g., if the UE is RM deregistered 940) or a service request (e.g., if the UE is RM registered 950). If the UE is RM registered 950, then the UE may initiate the AN signaling connection establishment by sending a service request, or the network may send a page, thereby triggering the UE to send the service request.

[0137] In CM connected 970, the UE can communicate with core network functions using NAS signaling. As an example, the UE may exchange NAS signaling with an AMF for registration management purposes, service request procedures, and / or authentication procedures. As another example, the UE may exchange NAS signaling, with an SMF, to establish and / or modify a PDU session. The network may disconnect the UE, or the UE may disconnect itself (AN signaling connection release 976). For example, if the UE transitions to RM deregistered 940, then the UE mayalso transition to CM idle 960. When the UE transitions to CM idle 960, the network may deactivate a user plane connection of a PDU session of the UE.

[0138] FIG. 9D is an example diagram showing CM state transitions of the wireless device (e.g., a UE), shown from a network perspective (e.g., an AMF). The CM state of the UE, as tracked by the AMF, may be in CM idle 980 (e.g., CM- IDLE) or CM connected 990 (e.g., CM-CONNECTED). When the UE transitions from CM idle 980 to CM connected 990, the AMF many establish an N2 context of the UE (N2 context establishment 989). When the UE transitions from CM connected 990 to CM idle 980, the AMF may release the N2 context of the UE (N2 context release 998).

[0139] FIGS. 10 - 12 illustrate example procedures for registering, service request, and PDU session establishment of a UE.

[0140] FIG. 10 illustrates an example of a registration procedure for a wireless device (e.g., a UE). Based on the registration procedure, the UE may transition from, for example, RM deregistered 940 to RM registered 950.

[0141] Registration may be initiated by a UE for the purposes of obtaining authorization to receive services, enabling mobility tracking, enabling reachability, or other purposes. The UE may perform an initial registration as a first step toward connection to the network (for example, if the UE is powered on, airplane mode is turned off, etc.). Registration may also be performed periodically to keep the network informed of the UE’s presence (for example, while in CM-IDLE state), or in response to a change in UE capability or registration area. Deregistration (not shown in FIG. 10) may be performed to stop network access.

[0142] At 1010, the UE transmits a registration request to an AN. As an example, the UE may have moved from a coverage area of a previous AMF (illustrated as AMF#1 ) into a coverage area of a new AMF (illustrated as AMF#2). The registration request may be a NAS message. The registration request may include a UE identifier. The AN may select an AMF for registration of the UE. For example, the AN may select a default AMF. For example, the AN may select an AMF that is already mapped to the UE (e.g., a previous AMF). The NAS registration request may include a network slice identifier and the AN may select an AMF based on the requested slice. After the AMF is selected, the AN may send the registration request to the selected AMF.

[0143] At 1020, the AMF that receives the registration request (AMF#2) performs a context transfer. The context may be a UE context, for example, an RRC context for the UE. As an example, AMF#2 may send AM F#1 a message requesting a context of the UE. The message may include the UE identifier. The message may be a Namf_ Communication- UEContextTransfer message. AMF#1 may send to AMF#2 a message that includes the requested UE context. This message may be a Namf_ Communication- UEContextTransfer message. After the UE context is received, the AMF#2 may coordinate authentication of the UE. After authentication is complete, AMF#2 may send to AMF#1 a message indicating that the UE context transfer is complete. This message may be a Namf_ Communication- UEContextTransfer Response message.

[0144] Authentication may require participation of the UE, an AUSF, a UDM and / or a UDR (not shown). For example, the AMF may request that the AUSF authenticate the UE. For example, the AUSF may execute authentication of the UE. For example, the AUSF may get authentication data from UDM. For example, the AUSF may send a subscriptionpermanent identifier (SUPI) to the AMF based on the authentication being successful. For example, the AUSF may provide an intermediate key to the AMF. The intermediate key may be used to derive an access-specific security key for the UE, enabling the AMF to perform security context management (SOM). The AUSF may obtain subscription data from the UDM. The subscription data may be based on information obtained from the UDM (and / or the UDR). The subscription data may include subscription identifiers, security credentials, access and mobility related subscription data and / or session related data.

[0145] At 1030, the new AMF, AMF#2, registers and / or subscribes with the UDM. AMF#2 may perform registration using a UE context management service of the UDM (Nudm_ UECM). AMF#2 may obtain subscription information of the UE using a subscriber data management service of the UDM (Nudm_ SDM). AMF#2 may further request that the UDM notify AMF#2 if the subscription information of the UE changes. As the new AMF registers and subscribes, the old AMF, AMF#1 , may deregister and unsubscribe. After deregistration, AMF#1 is free of responsibility for mobility management of the UE.

[0146] At 1040, AMF#2 retrieves access and mobility (AM) policies from the POF. As an example, the AMF#2 may provide subscription data of the UE to the POF. The POF may determine access and mobility policies for the UE based on the subscription data, network operator data, current network conditions, and / or other suitable information. For example, the owner of a first UE may purchase a higher level of service than the owner of a second UE. The POF may provide the rules associated with the different levels of service. Based on the subscription data of the respective UEs, the network may apply different policies which facilitate different levels of service.

[0147] For example, access and mobility policies may relate to service area restrictions, RAT / frequency selection priority (RFSP, where RAT stands for radio access technology), authorization and prioritization of access type (e.g., LTE versus NR), and / or selection of non-3GPP access (e.g., Access Network Discovery and Selection Policy (ANDSP)). The service area restrictions may comprise a list of tracking areas where the UE is allowed to be served (or forbidden from being served). The access and mobility policies may include a UE route selection policy (URSP)) that influences routing to an established PDU session or a new PDU session. As noted above, different policies may be obtained and / or enforced based on subscription data of the UE, location of the UE (i.e., location of the AN and / or AMF), or other suitable factors.

[0148] At 1050, AMF#2 may update a context of a PDU session. For example, if the UE has an existing PDU session, the AMF#2 may coordinate with an SMF to activate a user plane connection associated with the existing PDU session. The SMF may update and / or release a session management context of the PDU session (Nsmf_PDUSession_UpdateSMContext, Nsmf_ PDUSession_ ReleaseSMOontext).

[0149] At 1060, AMF#2 sends a registration accept message to the AN, which forwards the registration accept message to the UE. The registration accept message may include a new UE identifier and / or a new configured slice identifier. The UE may transmit a registration complete message to the AN, which forwards the registration complete message to the AMF#2. The registration complete message may acknowledge receipt of the new UE identifier and / or new configured slice identifier.

[0150] At 1070, AMF#2 may obtain UE policy control information from the PCF. The PCF may provide an access network discovery and selection policy (ANDSP) to facilitate non-3GPP access. The PCF may provide a UE route selection policy (URSP) to facilitate mapping of particular data traffic to particular PDU session connectivity parameters. As an example, the URSP may indicate that data traffic associated with a particular application should be mapped to a particular SSC mode, network slice, PDU session type, or preferred access type (3GPP or non-3GPP).

[0151] FIG. 11 illustrates an example of a service request procedure for a wireless device (e.g., a UE). The service request procedure depicted in FIG. 11 is a network-triggered service request procedure for a UE in a CM-IDLE state. However, other service request procedures (e.g., a UE-triggered service request procedure) may also be understood by reference to FIG. 11, as will be discussed in greater detail below.

[0152] At 1110, a UPF receives data. The data may be downlink data for transmission to a UE. The data may be associated with an existing PDU session between the UE and a DN. The data may be received, for example, from a DN and / or another UPF. The UPF may buffer the received data. In response to the receiving of the data, the UPF may notify an SMF of the received data. The identity of the SMF to be notified may be determined based on the received data. The notification may be, for example, an N4 session report. The notification may indicate that the UPF has received data associated with the UE and / or a particular PDU session associated with the UE. In response to receiving the notification, the SMF may send PDU session information to an AMF. The PDU session information may be sent in an N1N2 message transfer for forwarding to an AN. The PDU session information may include, for example, UPF tunnel endpoint information and / or QoS information.

[0153] At 1120, the AMF determines that the UE is in a CM-IDLE state. The determining at 1120 may be in response to the receiving of the PDU session information. Based on the determination that the UE is CM-IDLE, the service request procedure may proceed to 1130 and 1140, as depicted in FIG. 11. However, if the UE is not CM-IDLE (e.g., the UE is CM-CONNECTED), then 1130 and 1140 may be skipped, and the service request procedure may proceed directly to 1150.

[0154] At 1130, the AMF pages the UE. The paging at 1130 may be performed based on the UE being CM-IDLE. To perform the paging, the AMF may send a page to the AN. The page may be referred to as a paging or a paging message. The page may be an N2 request message. The AN may be one of a plurality of ANs in a RAN notification area of the UE. The AN may send a page to the UE. The UE may be in a coverage area of the AN and may receive the page.

[0155] At 1140, the UE may request service. The UE may transmit a service request to the AMF via the AN. As depicted in FIG. 11, the UE may request service at 1140 in response to receiving the paging at 1130. However, as noted above, this is for the specific case of a network-triggered service request procedure. In some scenarios (for example, if uplink data becomes available at the UE), then the UE may commence a UE-triggered service request procedure. The UE-triggered service request procedure may commence starting at 1140.

[0156] At 1150, the network may authenticate the UE. Authentication may require participation of the UE, an AUSF, and / or a UDM, for example, similar to authentication described elsewhere in the present disclosure. In some cases (forexample, if the UE has recently been authenticated), the authentication at 1150 may be skipped.

[0157] At 1160, the AMF and SMF may perform a PDU session update. As part of the PDU session update, the SMF may provide the AMF with one or more UPF tunnel endpoint identifiers. In some cases (not shown in FIG. 11 ), it may be necessary for the SMF to coordinate with one or more other SMFs and / or one or more other UPFs to set up a user plane.

[0158] At 1170, the AMF may send PDU session information to the AN. The PDU session information may be included in an N2 request message. Based on the PDU session information, the AN may configure a user plane resource for the UE. To configure the user plane resource, the AN may, for example, perform an RRC reconfiguration of the UE. The AN may acknowledge to the AMF that the PDU session information has been received. The AN may notify the AMF that the user plane resource has been configured, and / or provide information relating to the user plane resource configuration.

[0159] In the case of a UE-triggered service request procedure, the UE may receive, at 1170, a NAS service accept message from the AMF via the AN. After the user plane resource is configured, the UE may transmit uplink data (for example, the uplink data that caused the UE to trigger the service request procedure).

[0160] At 1180, the AMF may update a session management (SM) context of the PDU session. For example, the AMF may notify the SMF (and / or one or more other associated SMFs) that the user plane resource has been configured, and / or provide information relating to the user plane resource configuration. The AMF may provide the SMF (and / or one or more other associated SMFs) with one or more AN tunnel endpoint identifiers of the AN. After the SM context update is complete, the SMF may send an update SM context response message to the AMF.

[0161] Based on the update of the session management context, the SMF may update a POF for purposes of policy control. For example, if a location of the UE has changed, the SMF may notify the POF of the UE’s a new location.

[0162] Based on the update of the session management context, the SMF and UPF may perform a session modification. The session modification may be performed using N4 session modification messages. After the session modification is complete, the UPF may transmit downlink data (for example, the downlink data that caused the UPF to trigger the network-triggered service request procedure) to the UE. The transmitting of the downlink data may be based on the one or more AN tunnel endpoint identifiers of the AN.

[0163] FIG. 12 illustrates an example of a protocol data unit (PDU) session establishment procedure for a wireless device (e.g., a UE). The UE may determine to transmit the PDU session establishment request to create a new PDU session, to hand over an existing PDU session to a 3GPP network, or for any other suitable reason.

[0164] At 1210, the UE initiates PDU session establishment. The UE may transmit a PDU session establishment request to an AMF via an AN. The PDU session establishment request may be a NAS message. The PDU session establishment request may indicate: a PDU session ID; a requested PDU session type (new or existing); a requested DN (DNN); a requested network slice (S-NSSAI); a requested SSC mode; and / or any other suitable information. The PDU session ID may be generated by the UE. The PDU session type may be, for example, an Internet Protocol (IP)- based type (e.g., IPv4, IPv6, or dual stack IPv4 / IPv6), an Ethernet type, or an unstructured type.

[0165] The AMF may select an SMF based on the PDU session establishment request. In some scenarios, the requested PDU session may already be associated with a particular SMF. For example, the AMF may store a UE context of the UE, and the UE context may indicate that the PDU session ID of the requested PDU session is already associated with the particular SMF. In some scenarios, the AMF may select the SMF based on a determination that the SMF is prepared to handle the requested PDU session. For example, the requested PDU session may be associated with a particular DNN and / or S-NSSAI, and the SMF may be selected based on a determination that the SMF can manage a PDU session associated with the particular DNN and / or S-NSSAI.

[0166] At 1220, the network manages a context of the PDU session. After selecting the SMF at 1210, the AMF sends a PDU session context request to the SMF. The PDU session context request may include the PDU session establishment request received from the UE at 1210. The PDU session context request may be a Nsmf_ PDUSession_CreateSMContext Request and / or a Nsmf_PDUSession_UpdateSMContext Request. The PDU session context request may indicate identifiers of the UE; the requested DN; and / or the requested network slice. Based on the PDU session context request, the SMF may retrieve subscription data from a UDM. The subscription data may be session management subscription data of the UE. The SMF may subscribe for updates to the subscription data, so that the POF will send new information if the subscription data of the UE changes. After the subscription data of the UE is obtained, the SMF may transmit a PDU session context response to the AMG. The PDU session context response may be a Nsmf_ PDUSession_ CreateSMOontext Response and / or a Nsmf_PDUSession_UpdateSMContext Response. The PDU session context response may include a session management context ID.

[0167] At 1230, secondary authorization / authentication may be performed, if necessary. The secondary authorization / authentication may involve the UE, the AMF, the SMF, and the DN. The SMF may access the DN via a Data Network Authentication, Authorization and Accounting (DN AAA) server.

[0168] At 1240, the network sets up a data path for uplink data associated with the PDU session. The SMF may select a POF and establish a session management policy association. Based on the association, the POF may provide an initial set of policy control and charging rules (POO rules) for the PDU session. When targeting a particular PDU session, the POF may indicate, to the SMF, a method for allocating an IP address to the PDU Session, a default charging method for the PDU session, an address of the corresponding charging entity, triggers for requesting new policies, etc. The POF may also target a service data flow (SDF) comprising one or more PDU sessions. When targeting an SDF, the POF may indicate, to the SMF, policies for applying QoS requirements, monitoring traffic (e.g., for charging purposes), and / or steering traffic (e.g., by using one or more particular N6 interfaces).

[0169] The SMF may determine and / or allocate an IP address for the PDU session. The SMF may select one or more UPFs (a single UPF in the example of FIG. 12) to handle the PDU session. The SMF may send an N4 session message to the selected UPF. The N4 session message may be an N4 Session Establishment Request and / or an N4 Session Modification Request. The N4 session message may include packet detection, enforcement, and reporting rules associated with the PDU session. In response, the UPF may acknowledge by sending an N4 session establishment response and / or an N4 session modification response.

[0170] The SMF may send PDU session management information to the AMF. The PDU session management information may be a session service request (e.g., Namf_Communication_N1 N2MessageTransfer) message. The PDU session management information may include the PDU session ID. The PDU session management information may be a NAS message. The PDU session management information may include N1 session management information and / or N2 session management information. The N1 session management information may include a PDU session establishment accept message. The PDU session establishment accept message may include tunneling endpoint information of the UPF and quality of service (QoS) information associated with the PDU session.

[0171] The AMF may send an N2 request to the AN. The N2 request may include the PDU session establishment accept message. Based on the N2 request, the AN may determine AN resources for the UE. The AN resources may be used by the UE to establish the PDU session, via the AN, with the DN. The AN may determine resources to be used for the PDU session and indicate the determined resources to the UE. The AN may send the PDU session establishment accept message to the UE. For example, the AN may perform an RRC reconfiguration of the UE. After the AN resources are set up, the AN may send an N2 request acknowledge to the AMF. The N2 request acknowledge may include N2 session management information, for example, the PDU session ID and tunneling endpoint information of the AN.

[0172] After the data path for uplink data is set up at 1240, the UE may optionally send uplink data associated with the PDU session. As shown in FIG. 12, the uplink data may be sent to a DN associated with the PDU session via the AN and the UPF.

[0173] At 1250, the network may update the PDU session context. The AMF may transmit a PDU session context update request to the SMF. The PDU session context update request may be a Nsmf_PDUSession_UpdateSMContext Request. The PDU session context update request may include the N2 session management information received from the AN. The SMF may acknowledge the PDU session context update. The acknowledgement may be a Nsmf_PDUSession_UpdateSMContext Response. The acknowledgement may include a subscription requesting that the SMF be notified of any UE mobility event. Based on the PDU session context update request, the SMF may send an N4 session message to the UPF. The N4 session message may be an N4 Session Modification Request. The N4 session message may include tunneling endpoint information of the AN. The N4 session message may include forwarding rules associated with the PDU session. In response, the UPF may acknowledge by sending an N4 session modification response.

[0174] After the UPF receives the tunneling endpoint information of the AN, the UPF may relay downlink data associated with the PDU session. As shown in FIG. 12, the downlink data may be received from a DN associated with the PDU session via the AN and the UPF.

[0175] FIG. 13 illustrates examples of components of the elements in a communications network. FIG. 13 includes a wireless device 1310, a base station 1320, and a physical deployment of one or more network functions 1330 (henceforth “deployment 1330”). Any wireless device described in the present disclosure may have similar components and may be implemented in a similar manner as the wireless device 1310. Any other base station described in thepresent disclosure (or any portion thereof, depending on the architecture of the base station) may have similar components and may be implemented in a similar manner as the base station 1320. Any physical core network deployment in the present disclosure (or any portion thereof, depending on the architecture of the base station) may have similar components and may be implemented in a similar manner as the deployment 1330.

[0176] The wireless device 1310 may communicate with base station 1320 over an air interface 1370. The communication direction from wireless device 1310 to base station 1320 over air interface 1370 is known as uplink, and the communication direction from base station 1320 to wireless device 1310 over air interface 1370 is known as downlink. Downlink transmissions may be separated from uplink transmissions using FDD, TDD, and / or some combination of duplexing techniques. FIG. 13 shows a single wireless device 1310 and a single base station 1320, but it will be understood that wireless device 1310 may communicate with any number of base stations or other access network components over air interface 1370, and that base station 1320 may communicate with any number of wireless devices over air interface 1370.

[0177] The wireless device 1310 may comprise a processing system 1311 and a memory 1312. The memory 1312 may comprise one or more computer-readable media, for example, one or more non-transitory computer readable media. The memory 1312 may include instructions 1313. The processing system 1311 may process and / or execute instructions 1313. Processing and / or execution of instructions 1313 may cause wireless device 1310 and / or processing system 1311 to perform one or more functions or activities. The memory 1312 may include data (not shown). One of the functions or activities performed by processing system 1311 may be to store data in memory 1312 and / or retrieve previously-stored data from memory 1312. In an example, downlink data received from base station 1320 may be stored in memory 1312, and uplink data for transmission to base station 1320 may be retrieved from memory 1312. As illustrated in FIG. 13, the wireless device 1310 may communicate with base station 1320 using a transmission processing system 1314 and / or a reception processing system 1315. Alternatively, transmission processing system 1314 and reception processing system 1315 may be implemented as a single processing system, or both may be omitted and all processing in the wireless device 1310 may be performed by the processing system 1311. Although not shown in FIG. 13, transmission processing system 1314 and / or reception processing system 1315 may be coupled to a dedicated memory that is analogous to but separate from memory 1312, and comprises instructions that may be processed and / or executed to carry out one or more of their respective functionalities. The wireless device 1310 may comprise one or more antennas 1316 to access air interface 1370.

[0178] The wireless device 1310 may comprise one or more other elements 1319. The one or more other elements 1319 may comprise software and / or hardware that provide features and / or functionalities, for example, a speaker, a microphone, a keypad, a display, a touchpad, a satellite transceiver, a universal serial bus (USB) port, a hands-free headset, a frequency modulated (FM) radio unit, a media player, an Internet browser, an electronic control unit (e.g., for a motor vehicle), and / or one or more sensors (e.g., an accelerometer, a gyroscope, a temperature sensor, a radar sensor, a lidar sensor, an ultrasonic sensor, a light sensor, a camera, a global positioning sensor (GPS) and / or the like). The wireless device 1310 may receive user input data from and / or provide user output data to the one or moreone or more other elements 1319. The one or more other elements 1319 may comprise a power source. The wireless device 1310 may receive power from the power source and may be configured to distribute the power to the other components in wireless device 1310. The power source may comprise one or more sources of power, for example, a battery, a solar cell, a fuel cell, or any combination thereof.

[0179] The wireless device 1310 may transmit uplink data to and / or receive downlink data from base station 1320 via air interface 1370. To perform the transmission and / or reception, one or more of the processing system 1311, transmission processing system 1314, and / or reception system 1315 may implement open systems interconnection (OSI) functionality. As an example, transmission processing system 1314 and / or reception system 1315 may perform layer 1 OSI functionality, and processing system 1311 may perform higher layer functionality. The wireless device 1310 may transmit and / or receive data over air interface 1370 using one or more antennas 1316. For scenarios where the one or more antennas 1316 include multiple antennas, the multiple antennas may be used to perform one or more multi-antenna techniques, such as spatial multiplexing (e.g., single-user multiple-input multiple output (MIMO) or multiuser Ml MO), transmit / receive diversity, and / or beamforming.

[0180] The base station 1320 may comprise a processing system 1321 and a memory 1322. The memory 1322 may comprise one or more computer-readable media, for example, one or more non-transitory computer readable media. The memory 1322 may include instructions 1323. The processing system 1321 may process and / or execute instructions 1323. Processing and / or execution of instructions 1323 may cause base station 1320 and / or processing system 1321 to perform one or more functions or activities. The memory 1322 may include data (not shown). One of the functions or activities performed by processing system 1321 may be to store data in memory 1322 and / or retrieve previously-stored data from memory 1322. The base station 1320 may communicate with wireless device 1310 using a transmission processing system 1324 and a reception processing system 1325. Although not shown in FIG. 13, transmission processing system 1324 and / or reception processing system 1325 may be coupled to a dedicated memory that is analogous to but separate from memory 1322, and comprises instructions that may be processed and / or executed to carry out one or more of their respective functionalities. The wireless device 1320 may comprise one or more antennas 1326 to access air interface 1370.

[0181] The base station 1320 may transmit downlink data to and / or receive uplink data from wireless device 1310 via air interface 1370. To perform the transmission and / or reception, one or more of the processing system 1321, transmission processing system 1324, and / or reception system 1325 may implement OSI functionality. As an example, transmission processing system 1324 and / or reception system 1325 may perform layer 1 OSI functionality, and processing system 1321 may perform higher layer functionality. The base station 1320 may transmit and / or receive data over air interface 1370 using one or more antennas 1326. For scenarios where the one or more antennas 1326 include multiple antennas, the multiple antennas may be used to perform one or more multi-antenna techniques, such as spatial multiplexing (e.g., single-user multiple-input multiple output (MIMO) or multi-user MIMO), transmit / receive diversity, and / or beamforming.

[0182] The base station 1320 may comprise an interface system 1327. The interface system 1327 may communicatewith one or more base stations and / or one or more elements of the core network via an interface 1380. The interface 1380 may be wired and / or wireless and interface system 1327 may include one or more components suitable for communicating via interface 1380. In FIG. 13, interface 1380 connects base station 1320 to a single deployment 1330, but it will be understood that wireless device 1310 may communicate with any number of base stations and / or ON deployments over interface 1380, and that deployment 1330 may communicate with any number of base stations and / or other ON deployments over interface 1380. The base station 1320 may comprise one or more other elements 1329 analogous to one or more of the one or more other elements 1319.

[0183] The deployment 1330 may comprise any number of portions of any number of instances of one or more network functions (NFs). The deployment 1330 may comprise a processing system 1331 and a memory 1332. The memory 1332 may comprise one or more computer-readable media, for example, one or more non-transitory computer readable media. The memory 1332 may include instructions 1333. The processing system 1331 may process and / or execute instructions 1333. Processing and / or execution of instructions 1333 may cause the deployment 1330 and / or processing system 1331 to perform one or more functions or activities. The memory 1332 may include data (not shown). One of the functions or activities performed by processing system 1331 may be to store data in memory 1332 and / or retrieve previously-stored data from memory 1332. The deployment 1330 may access the interface 1380 using an interface system 1337. The deployment 1330 may comprise one or more other elements 1339 analogous to one or more of the one or more other elements 1319.

[0184] Oneor moreof the systems 1311, 1314, 1315, 1321, 1324, 1325, and / or 1331 may comprise one or more controllers and / or one or more processors. The one or more controllers and / or one or more processors may comprise, for example, a general-purpose processor, a digital signal processor (DSP), a microcontroller, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) and / or other programmable logic device, discrete gate and / or transistor logic, discrete hardware components, an on-board unit, or any combination thereof. One or more of the systems 1311, 1314, 1315, 1321, 1324, 1325, and / or 1331 may perform signal coding / processing, data processing, power control, inpu t / outpu t processing, and / or any other functionality that may enable wireless device 1310, base station 1320, and / or deployment 1330 to operate in a mobile communications system.

[0185] Many of the elements described in the disclosed embodiments may be implemented as modules. A module is defined here as an element that performs a defined function and has a defined interface to other elements. The modules described in this disclosure may be implemented in hardware, software in combination with hardware, firmware, wetware (e.g. hardware with a biological element) or a combination thereof, which may be behaviorally equivalent. For example, modules may be implemented as a software routine written in a computer language configured to be executed by a hardware machine (such as C, C++, Fortran, Java, Basic, Matlab and / or the like) or a modeling / simulation program such as Simulink, Stateflow, GNU Octave, or LabVI EWMathScript. It may be possible to implement modules using physical hardware that incorporates discrete or programmable analog, digital and / or quantum hardware. Examples of programmable hardware comprise computers, microcontrollers, microprocessors, DSPs, ASICs, FPGAs, and complex programmable logic devices (CPLDs). Computers, microcontrollers and microprocessorsmay be programmed using languages such as assembly, C, C++ and / or the like. FPGAs, ASICs and CPLDs are often programmed using hardware description languages (HDL) such as VHSIC hardware description language (VHDL) or Verilog that configure connections between internal hardware modules with lesser functionality on a programmable device. The mentioned technologies are often used in combination to achieve the result of a functional module.

[0186] The wireless device 1310, base station 1320, and / or deployment 1330 may implement timers and / or counters. A timer / counter may start at an initial value. As used herein, starting may comprise restarting. Once started, the timer / counter may run. Running of the timer / counter may be associated with an occurrence. When the occurrence occurs, the value of the timer / counter may change (for example, increment or decrement). The occurrence may be, for example, an exogenous event (for example, a reception of a signal, a measurement of a condition, etc.), an endogenous event (for example, a transmission of a signal, a calculation, a comparison, a performance of an action or a decision to so perform, etc.), or any combination thereof. In the case of a timer, the occurrence may be the passage of a particular amount of time. However, it will be understood that a timer may be described and / or implemented as a counter that counts the passage of a particular unit of time. A timer / counter may run in a direction of a final value until it reaches the final value. The reaching of the final value may be referred to as expiration of the timer / counter. The final value may be referred to as a threshold. A timer / counter may be paused, wherein the present value of the timer / counter is held, maintained, and / or carried over, even upon the occurrence of one or more occurrences that would otherwise cause the value of the timer / counter to change. The timer / counter may be un-paused or continued, wherein the value that was held, maintained, and / or carried over begins changing again when the one or more occurrence occur. A timer / counter may be set and / or reset. As used herein, setting may comprise resetting. When the timer / counter sets and / or resets, the value of the timer / counter may be set to the initial value. A timer / counter may be started and / or restarted. As used herein, starting may comprise restarting. In some embodiments, when the timer / counter restarts, the value of the timer / counter may be set to the initial value and the timer / counter may begin to run.

[0187] FIGS. 14A, 14B, 140, and 14D illustrate various example arrangements of physical core network deployments, each having one or more network functions or portions thereof. The core network deployments comprise a deployment 1410, a deployment 1420, a deployment 1430, a deployment 1440, and / or a deployment 1450. Each deployment may be analogous to, for example, the deployment 1330 depicted in FIG. 13. In particular, each deployment may comprise a processing system for performing one or more functions or activities, memory for storing data and / or instructions, and an interface system for communicating with other network elements (for example, other core network deployments). Each deployment may comprise one or more network functions (NFs). The term NF may refer to a particular set of functionalities and / or one or more physical elements configured to perform those functionalities (e.g., a processing system and memory comprising instructions that, when executed by the processing system, cause the processing system to perform the functionalities). For example, in the present disclosure, when a network function is described as performing X, Y, and Z, it will be understood that this refers to the one or more physical elements configured to perform X, Y, and Z, no matter how or where the one or more physical elements are deployed. The term NF may refer to a network node, network element, and / or network device.

[0188] As will be discussed in greater detail below, there are many different types of NF and each type of NF may be associated with a different set of functionalities. A plurality of different NFs may be flexibly deployed at different locations (for example, in different physical core network deployments) or in a same location (for example, co-located in a same deployment). A single NF may be flexibly deployed at different locations (implemented using different physical core network deployments) or in a same location. Moreover, physical core network deployments may also implement one or more base stations, application functions (AFs), data networks (DNs), or any portions thereof. NFs may be implemented in many ways, including as network elements on dedicated or shared hardware, as software instances running on dedicated or shared hardware, or as virtualized functions instantiated on a platform (e.g., a cloud-based platform).

[0189] FIG. 14A illustrates an example arrangement of core network deployments in which each deployment comprises one network function. A deployment 1410 comprises an NF 1411, a deployment 1420 comprises an NF 1421, and a deployment 1430 comprises an NF 1431. The deployments 1410, 1420, 1430 communicate via an interface 1490. The deployments 1410, 1420, 1430 may have different physical locations with different signal propagation delays relative to other network elements. The diversity of physical locations of deployments 1410, 1420, 1430 may enable provision of services to a wide area with improved speed, coverage, security, and / or efficiency.

[0190] FIG. 14B illustrates an example arrangement wherein a single deployment comprises more than one NF. Unlike FIG. 14A, where each NF is deployed in a separate deployment, FIG. 14B illustrates multiple NFs in deployments 1410, 1420. In an example, deployments 1410, 1420 may implement a software-defined network (SDN) and / or a network function virtualization (NFV).

[0191] For example, deployment 1410 comprises an additional network function, NF 1411A. The NFs 1411, 1411 A may consist of multiple instances of the same NF type, co-located at a same physical location within the same deployment 1410. The NFs 1411, 1411A may be implemented independently from one another (e.g., isolated and / or independently controlled). For example, the NFs 1411, 1411 A may be associated with different network slices. A processing system and memory associated with the deployment 1410 may perform all of the functionalities associated with the NF 1411 in addition to all of the functionalities associated with the NF 1411 A. In an example, NFs 1411, 1411 A may be associated with different PLMNs, but deployment 1410, which implements NFs 1411, 1411 A, may be owned and / or operated by a single entity.

[0192] Elsewhere in FIG. 14B, deployment 1420 comprises NF 1421 and an additional network function, NF 1422. The NFs 1421, 1422 may be different NF types. Similar to NFs 1411, 1411 A, the NFs 1421, 1422 may be co-located within the same deployment 1420, but separately implemented. As an example, a first PLMN may own and / or operate deployment 1420 having NFs 1421, 1422. As another example, the first PLMN may implement NF 1421 and a second PLMN may obtain from the first PLMN (e.g., rent, lease, procure, etc.) at least a portion of the capabilities of deployment 1420 (e.g., processing power, data storage, etc.) in order to implement NF 1422. As yet another example, the deployment may be owned and / or operated by one or more third parties, and the first PLMN and / or second PLMN may procure respective portions of the capabilities of the deployment 1420. When multiple NFs are provided at a singledeployment, networks may operate with greater speed, coverage, security, and / or efficiency.

[0193] FIG. 140 illustrates an example arrangement of core network deployments in which a single instance of an NF is implemented using a plurality of different deployments. In particular, a single instance of NF 1422 is implemented at deployments 1420, 1440. As an example, the functionality provided by NF 1422 may be implemented as a bundle or sequence of subservices. Each subservice may be implemented independently, for example, at a different deployment. Each subservices may be implemented in a different physical location. By distributing implementation of subservices of a single NF across different physical locations, the mobile communications network may operate with greater speed, coverage, security, and / or efficiency.

[0194] FIG. 14D illustrates an example arrangement of core network deployments in which one or more network functions are implemented using a data processing service. In FIG. 14D, NFs 1411, 1411A, 1421, 1422 are included in a deployment 1450 that is implemented as a data processing service. The deployment 1450 may comprise, for example, a cloud network and / or data center. The deployment 1450 may be owned and / or operated by a PLMN or by a non-PLMN third party. The NFs 1411, 1411 A, 1421, 1422 that are implemented using the deployment 1450 may belong to the same PLMN or to different PLMNs. The PLMN(s) may obtain (e.g., rent, lease, procure, etc.) at least a portion of the capabilities of the deployment 1450 (e.g., processing power, data storage, etc.). By providing one or more NFs using a data processing service, the mobile communications network may operate with greater speed, coverage, security, and / or efficiency.

[0195] As shown in the figures, different network elements (e.g., NFs) may be located in different physical deployments, or co-located in a single physical deployment. It will be understood that in the present disclosure, the sending and receiving of messages among different network elements is not limited to inter-deployment transmission or intra-deployment transmission, unless explicitly indicated.

[0196] In an example, a deployment may be a 'black box’ that is preconfigured with one or more NFs and preconfigured to communicate, in a prescribed manner, with other 'black box’ deployments (e.g., via the interface 1490). Additionally or alternatively, a deployment may be configured to operate in accordance with open-source instructions (e.g., software) designed to implement NFs and communicate with other deployments in a transparent manner. The deployment may operate in accordance with open RAN (O-RAN) standards.

[0197] An example embodiment depicted in FIG. 15 illustrates how data generated by an application is delivered from a sender to a receiver. The unit of data generated by the application may be an application data unit (ADU). The ADU may comprise, for example, a picture file, a video frame, text file and so on. The ADU may, for example, be generated and / or created by a first instance of a particular application, for use and / or enjoyment by a second instance of the application, or for processing by an application server of the application. To reliably deliver the ADU and / or to process the ADU efficiently, the ADU may be divided into one or more smaller units. For example, the one or more smaller units may be one or more protocol data units (PDUs). One or more first PDUs (e.g., PDU 1, PDU 2) for a first ADU may be of a first PDU set (e.g., PDU set 1 ). In an example, the first ADU may be segmented to the one or more first PDUs. The first PDU set may comprise the one or more first PDUs. One or more second PDUs (e.g., PDU 3, PDU 4) for a second ADU may be of a second PDU set (e.g., PDU set 2). In an example, the second ADU may be segmented to the one or more second PDUs. The second PDU set may comprise the one or more second PDUs.

[0198] In an example, the application may deliver the one or more first PDUs and / or the one or more second PDUs to an SDAP / PDCP entity (e.g., a SDAP entity, a PDCP entity, and / or both a SDAP entity and a PDCP entity). The first PDU (e.g., PDU 1) may be delivered from the application to the SDAP / PDCP entity. In the SDAP / PDCP entity, the first PDU may correspond to a first SDAP SDU, a first SDAP PDU, a first PDCP SDU, and / or a first PDCP PDU. The second PDU (e.g., PDU 2) may be delivered from the application to the SDAP / PDCP entity. In the SDAP / PDCP entity, the second PDU may correspond to a second SDAP SDU, a second SDAP PDU, a second PDCP SDU, and / or a second PDCP PDU. Similarly, the PDU 3 may be a third PDCP PDU (e.g., PDCP PDU 3) and / or the PDU 4 may be a fourth PDCP PDU (e.g., PDCP PDU 4).

[0199] In an example, one or more PDCP PDUs (e.g., PDCP PDU 1 , 2, 3, 4) may be delivered from the SDAP / PDCP entity to a RLC entity. The RLC layer may provide functionality of forwarding the one or more packets, for example, over a particular interface, from one node to another, using a MAC entity and / or a PHY entity.

[0200] As depicted in FIG. 15, for example, the application in the sender may generate one or more PDU sets. For example, the one or more PDU sets comprise the first PDU set and / or the second PDU set. The application in the sender may deliver the one or more PDU sets to the SDAP / PDCP entity of the sender. The SDAP / PDCP entity may classify the one or more PDUs of the one or more PDU sets, may apply header compression to the one or more PDUs to reduce size of headers of the one or more PDUs, may apply ciphering to the one or more PDUs to provide security, and / or may generate one or more PDCP PDUs.

[0201] In an example, the SDAP / PDCP entity of the sender delivers the generated one or more PDCP PDUs to the RLC entity. The RLC entity may be responsible for transferring data between a UE and a NG-RAN, using the MAC entity and / or the PHY entity. For example, the RLC entity of the sender may process and generate one or more RLC PDUs for the one or more PDCP PDUs (e.g., RLC SDUs) delivered from the PDCP / SDAP entity. For example, the RLC entity may generate a first RLC PDU from the first PDCP PDU (e.g., the first RLC SDU) and / or the RLC entity may generate a second RLC PDU from the second PDCP PDU (e.g., the second RLC SDU).

[0202] In an example, the one or more RLC PDUs generated by the RLC entity of the sender may be delivered to theMAC entity of the sender. The MAC entity of the sender may send the one or more RLC PDUs to a MAC entity of the receiver. The MAC entity of the receiver may deliver the one or more RLC PDUs to a RLC entity of the receiver. For example, the RLC entity of the receiver may receive the one or more RLC PDUs (e.g., RLC PDU 1, 2, 3, 4). The RLC entity of the receiver may recover the one or more RLC SDUs (e.g., PDCP PDUs) using the one or more RLC PDUs. The RLC entity may deliver the one or more recovered PDCP PDUs to a PDCP entity of the receiver. The PDCP entity of the receiver may process the one or more received PDCP PDUs, and / or may recover one or more PDUs (e.g., one or more PDCP SDUs) from the one or more PDCP PDUs. To recover a PDCP SDU from a PDCP PDU may be that the PDCP SDU is extracted from the PDCP PDU.

[0203] An example embodiment depicted in FIG. 16 illustrates one or more PDU sets generated by an application. In an example, the application may generate one or more PDUs. For example, the one or more PDUs may comprise one or more FEC PDUs and / or one or more non-FEC PDUs. For example, the application may generate one or more PDU sets. The one or more PDU sets may comprise one or more first PDU sets and / or one or more second PDU sets. For example, the one or more first PDU sets (e.g., I frame) may be of a first PDU set importance (e.g., 1, high, important) and / or the one or more second PDU sets (e.g., P frame) may be of a second PDU set importance (e.g., 0, low, not important). For example, the one or more PDU sets may comprise the one or more PDUs. For example, a PDU of the one or more PDUs may belong to a PDU set of the one or more PDU sets. For example, the first PDU set may comprise one or more first FEC PDUs (e.g., PDU 3, PDU 4) and / or one or more non-FEC PDUs (e.g., PDU 1 , PDU 2). For example, the second PDU set may comprise one or more second FEC PDUs (e.g., PDU 6, PDU 7, PDU 8) and / or one or more non-FEC PDUs (e.g., PDU 5). A first number of PDUs in the first PDU set may be same as and / or different from a second number of PDUs in the second PDU sets. A third number of FEC PDUs in the first PDU set may be same as and / or different from a fourth number of FEC PDUs in the second PDU sets.

[0204] In an example, the one or more non-FEC PDUs (e.g., base PDUs) may be necessary for a receiver to properly operate and / or to support a service (or QoS) requirement. For example, in a video application, to present a picture frame to a user, the receive may need to receive the one or more non-FEC PDUs. For example, if the one or more first non-FEC PDUs of the first PDU set is not received, an application of the receiver may not be able to present an adequate picture frame to a viewer.

[0205] In another example, the one or more FEC PDUs may be useful for the receiver to properly operate and / or to support the service (or QoS) requirement. For example, if the receiver fails to receive at least one of the one or more first non-FEC PDUs of the first PDU set, and if the receives at least one of the one or more FEC PDUs, the application of the receiver may be able to present a decent picture frame to the viewer. For example, the one or more FEC PDUs may comprise one or more data bits that can correct some errors in received (or missing) non-FEC PDUs. For example, the one or more FEC PDUs may comprise information that are included in the non-FEC PDUs. In this case, if the at least one non-FEC PDU is not received by the receiver, the receiver may recover information (for an associated ADU) included in the at least one non-FEC PDU, by using information conveyed by the one or more FEC PDUs.

[0206] In other example, to properly process an ADU, the receiver may need to receive certain amount of data. Forexample, a third ADU may comprise a N3 number (e.g. , 10) of PDUs. For example, the N3 number of PDUs may be of a PDU set X3. For example, a FEC packet ratio for this PDU set X3 may be a N4 (e.g., 50 %). In this case, the receiver may need to receive N4 percent of the N3 number of PDUs, for proper operation, (e.g., the receiver needs to receive at least 5 PDUs of the PDU set X3). In this case, after the receiver receives the 5 PDUs, then remaining 5 PDUs may be the FEC PDUs. For example, the ratio may be a percent, a percentage, and / or the like.

[0207] In an example as depicted in FIG. 17, an application (e.g., an application client) of a UE may communicate with an application server (or another application client in another UE).

[0208] In an example, the UE may generate one or more PDUs (e.g., PDU 1 , PDU 2, PDU 3, PDU 4) for the application. For example, the one or more PDUs may comprise one or more FEC PDUs (e.g., PDU 3, PDU 4) and / or one or more non-FEC PDUs (e.g., PDU 1 , PDU 2). For example, the one or more PDUs may or may not be of a PDU set (e.g., PDU set 1).

[0209] In an example, a UE may try to send the one or more PDUs to a network. For example, the UE may send a resource scheduling request (e.g., scheduling request, buffer status report) to the network (e.g., a base station). In an example, the base station may handle a large quantity of UEs and / or may not have enough resources to serve the large quantity of UEs. In this case, if the UE transmits all PDUs of the PDU set, this may not help in solving resource shortage in the network. For example, if the UE successfully transmits the one or more non-FEC PDUs to the network, further sending the one or more FEC PDUs may not be desirable. I.e., the sending the one or more FEC PDUs may contribute to minor or no improvement in service quality, while consuming more radio resources at the time of radio resource shortage.

[0210] In an example as depicted in FIG. 18, an application (e.g., an application client) of a UE may communicate with an application server (or another application client in another UE).

[0211] In an example, the UE may generate one or more PDUs (e.g., PDU 1 , PDU 2, PDU 3, PDU 4) for the application. For example, the one or more PDUs may comprise one or more FEC PDUs (e.g., PDU 3, PDU 4) and / or one or more non-FEC PDUs (e.g., PDU 1 , PDU 2). For example, the one or more PDUs may be of a PDU set (e.g., PDU set 1).

[0212] In an example, a UE may try to send the one or more PDUs to a network. In an example, based on enough radio resource not being allocated, the UE may not send the one or more FEC PDUs and / or may discard the one or more FEC PDUs. For example, the UE may send the one or more non-FEC PDUs to the network. The application server may receive the one or more non-FEC PDUs and / or may not receive the one or more FEC PDUs. For example, because the application server does not receive the one or more FEC PDUs, the application server may determine that a communication link between the UE and the application server is not reliable. For example, the application server may determine to send, to the UE, a request to increase a number of FEC PDUs. If the UE generates more FEC PDUs based on the request, this will further aggravate radio resource shortage and / or may make the application server generate inaccurate commands.

[0213] In example embodiments of the present disclosure, signalling may be enhanced to deliver information of whena UE is allowed to discard one or more PDUs (e.g. , FEC PDUs). For example, the UE may be configured with information to determine how many (e.g., percent, number) PDUs needs to be discarded, which PDUs from which PDU set needs to be discard, which PDUs from which PSI needs to be discarded. This may help in preventing abnormal application behavior, and / or reducing unnecessary discarding of a PDU, while satisfying application requirements. In another example, the UE may be configured with a criterion on when to discard which PDU. This may help the base station, to determine whether discarding is performed in the UE. In another example, the UE may be configured with a timer value for a FEC PDU. This may help the base station to control the amount of FEC PDUs for transmission.

[0214] In the specification, the term “5G access network” may be interpreted as, or may refer to, an access network comprising at least one of a NG-RAN and non-3GPP access network (AN), and connecting to a 5G core network.

[0215] In the specification, the term “3GPP RAN” or “RAN” may be interpreted as, or may refer to, a radio access network using 3GPP RAT. For example, this may comprise at least one of a gNB, an eNB, a ng-eNB, an en-gNB, the like, and / or a combination thereof. For example, this may be at least one of an E-UTRAN, NG-RAN, the like, and / or a combination thereof.

[0216] In the specification, the term “NG-RAN” may be interpreted as a base station, which may comprise at least one of a gNB, an eNB, a ng-eNB, a NodeB, an access node, an access point, an N3IWF, a relay node, a base station central unit (e.g., gNB-CU), a base station distributed unit (e.g., gNB-DU), and / or the like. In the specification, a gNB may be interpreted as a base station. In the specification, a gNB-CU may be interpreted as a base station central unit. In the specification, a gNB-DU may be interpreted as a base station distributed unit. This may be a radio access network that connects to 5GC, supporting at least one of NR, E-UTRA, and / or a combination thereof.

[0217]

[0218] In the specification, the term “E-UTRAN” may be interpreted as, or may refer to, a base station, which may comprise at least one of an eNB, an en-gNB, and / or the like. This may be a radio access network that connects to evolved packet core (EPC), supporting at least one of NR, E-UTRA, and / or a combination thereof.

[0219] In the specification, the term “network node” may be interpreted as, or may refer to, at least one of a core network node, an access node, a UE, the like, and / or a combination thereof. A network may comprise one or more network nodes.

[0220] In the specification, the term “core network node” may be interpreted as, or may refer to, a core network device, which may comprise at least one of an AMF, a SMF, a NSSF, a UPF, a NRF a UDM, a PCF, a SoR-AF, an AF, an DDNMF, an MB-SMF, an MB-UPF, a MME, a SGW, a PGW, a SMF+PGW-C, a SMF^GW-U, a UDM+HSS and / or the like.

[0221] In the specification, the term “5G core network” may be interpreted as, or may refer to, a core network connecting to a 5G access network. This may be 5G core (5GC).

[0222] In the specification, the term “network node” may be interpreted as a core network node, an access node, a UE, and / or the like. A network may comprise one or more network nodes.

[0223] In the specification, a protocol entity may be interpreted as an entity performing a set of specific functionsrelated to a wireless access (e.g., LTE access, NR access) and / or a wireline access (e.g., Ethernet) and / or communication (e.g., TCP, IP). In an example, an entity may be interpreted as a protocol entity. In an example, the protocol entity of LTE and / or NR may be at least one of a SDAP entity, a PDCP entity, a RLC entity, a MAC entity and / or a PHY entity. In an example, a layer (e.g., a SDAP layer, a PDCP layer, a RLC layer, a MAC layer a PHY layer) may be interpreted as a protocol entity (e.g., SDAP entity, a PDCP entity, a RLC entity, a MAC entity, a PHY entity).

[0224] In the specification, a service data unit may be interpreted as a unit of a data, received by a protocol entity. In the specification, a protocol data unit may be interpreted as a unit of a data, sent by a protocol entity. A protocol entity may receive one or more service data units (SDUs) from other protocol entity, and the protocol entity may send one or more protocol service data units (PDUs) to another protocol entity of same host or another host. A PDU in a PDU set may corresponds to a PDCP SDU. For example, a PDCP entity may receive one or more PDCP SDUs from a higher entity and the PDCP entity may send one or more PDCP PDUs to a lower entity (e.g., an RLC entity). The lower entity (e.g., an RLC entity) may receive one or more SDUs (e.g., RLC SDUs) from the higher layer. The one or more SDUs received by the lower layer may be same as the one or more PDUs sent by the higher layer. In the specification, a PDCP SDU may be a PDU. FIG. 19 illustrates one example of relationship between one or more PDUs and / or one or more SDUs. For example, PDU 1 and PDU 2 may be generated by an application of a sender (a UE or in an application server). The PDU 1 and the PDU 2 may be delivered to a sending SDAP entity as a SDAP SDU 1 and 1 SDAP SDU 2. The sending SDAP entity may construct a SDAP PDU 1 from a SDAP header 1 and the SDAP SDU 1. The sending SDAP entity may deliver the SDAP PDU 1 to a sending PDCP entity. The sending PDCP entity may receive the SDAP PDU 1 as a PDCP SDU 1. The sending PDCP entity may construct a PDCP PDU 1 from a PDCP header 1 and the PDCP SDU 1. The PDCP SDU 1 may be a PDU of a PDU set. The sending PDCP entity may deliver the PDCP PDU 1 to a sending RLC entity. The sending RLC entity may receive the PDCP PDU 1 as a RLC SDU 1. The sending RLC entity may construct a RLC PDU 1 from a RLC header 1 and the RLC SDU 1. The sending RLC entity may deliver the RLC PDU 1 to a receiving RLC entity via a MAC / PHY entity. The receiving RLC entity may receive the RLC PDU 1. The receiving RLC entity may recover the RLC SDU 1 from the RLC PDU 1 and / or may deliver the RLC SDU 1 to a receiving PDCP entity. The receiving PDCP entity may receive the RLC SDU 1 as the PDCP PDU 1. The receiving PDCP entity may recover the PDCP SDU 1 from the PDCP PDU 1 and / or may deliver the PDCP SDU 1 to a receiving SDAP entity. The receiving SDAP entity may receive the PDCP SDU 1 as the SDAP PDU 1.

[0225] In the specification, the term “AF (application function)” may be interpreted as a AS (application server), which may host and / or run one or more applications.

[0226] In the specification, the term “PDU set” may be interpreted as one or more PDUs carrying a payload of one unit of information generated at an application layer level (e.g., a frame or video slice). In some implementations all PDUs in a PDU Set may be needed by the application layer to use the corresponding unit of information. In other implementations, the application layer may be able to recover parts of the unit of information unit, when some PDUs in the PDU set are missing. A PDU in the PDU Set may correspond to a PDCP SDU. A PDU in the PDU Set may correspond to a packet of an ADU.

[0227] In the specification, the term “ADU” may be interpreted as one unit of information. The unit of information may be exchanged among one or more hosts serving an application. In an example, an application (e.g., an internet browser, an instant messaging application, a video-player application, etc.) may be running on a first host (e.g., a smartphone, computer, application server, etc.) and the same application may be running on a second host (e.g., another smartphone, computer, application server, etc.). The application on a first host may generate one or more units (e.g., a picture file, a text message, etc.) of information. Each of the one or more units of information may comprises one or more PDUs, and / or the one or more PDUs for a unit of information may be a PDU set. The ADU may comprise one or more packets (e.g., PDUs)

[0228] In the specification, the term “PSER” may be interpreted as an upper bound for the rate of PDU sets that have been processed by the sender of an access stratum (AS) protocol (e.g., a RLC entity, a PDCP entity, and / or the like), but where all PDUs in the PDU set are not successfully delivered by the corresponding receiver. The PSER may be an upper bound for the ratio between the number of PDU sets not successfully received and the total number of PDU sets sent towards a recipient, measured over a measurement window. For example, the PSER may define an upper bound for a rate of non-congestion related packet losses. For example, based on a target PSER informed by a core network node, the NG-RAN may configure the AS protocol. For a GBR QoS Flow, a PDU set which is delayed more than PSDB may be counted as lost and included in the PSER calculation unless the QoS flow is exceeding the GFBR. The PSER may a ratio between a number of PDU sets successfully delivered to a receiver to a number of PDU sets that a sender needs to deliver to the receiver.

[0229] In the specification, the term “PSDB” may be interpreted as an upper bound for the time that a PDU set may be delayed between the UE and the N6 termination point at the UPF before being considered as not successfully delivered. The PSDB may define an upper bound for a time that a PDU set may be delayed between the UE and the N6 termination point at the UPF. For example, the target PSDB (required PSDB, PSDB sent by the SMF) may be set to 100 ms. For example, a PDU set may comprise a first PDU and a second PDU. The first PDU may arrive at a UPF at t1 =0 ms, and / or the second PDU may arrive at the UPF at t2=10 ms. The UE may receive the first PDU at t3=50. The UE may receive the second PDU at t4=110 ms. For the PDU set, the achieved PDU set delay may be t4 (a delivery time of last PDU of the PDU set) minus t1 (an arrival time of first PDU of the PDU set), which is 110 ms (110ms-0ms). In this case the achieved PSDB (which is 110ms) is beyond the target PSDB, and QoS requirement is not fulfilled.

[0230] In the specification, the term “forward-error-correction (FED)” may be interpreted as a technique that detects and corrects error in data transmission. For example, a PDU set of an ADU may comprise one or more FEC PDUs and / or one or more non-FEC PDUs. When a receiver does not receive some of the one or more non-FEC PDUs, the receiver may be able to recover the ADU (or the part of the ADU) based on the one or more received FEC PDUs and / or the one or more received non-FEC PDUs. Or, when the receiver receives more than X percent (e.g., threshold, ratio) of one or more PDUs of the PDU set, the receiver may be able to recover some or whole information of the ADU. Or, when the receiver receives first Y PDUs of the one or more PDUs of the PDU set, the receiver may be able to recover some or whole information of the ADU. These example techniques used for recovering information of the ADU may bethe FEC.

[0231] In the specification, the term “FEC PDU” may be referred to as a PDU eligible for discarding by a transmitter, when a technique for FEC is used. For example, a first PDU set may comprise 5 PDUs, and a receiver may need to receive at least 3 PDUs of the 5 PDUs. If the receiver already received the 3 PDUs, the transmitter may decide to discard remaining 2 PDUs. The remaining 2 PDUs (e.g., PDUs that the transmitter is allowed to discard due to FEC) may be the FEC PDUs. In other example, a second PDU set may comprise 4 PDUs, and 2 PDUs (e.g., PDU 0, PDU 1) of the 4 PDUs may comprise a critical information (e.g., information that the receive should receive) and remaining 2 PDUs (e.g., PDU 2, PDU 3) may comprise an optional (redundant) information. In this case, if the receiver already receives the 2 PDUs (e.g., PDU 0, PDU 1), the transmitter may be allowed to either to send the remaining 2 PDUs (e.g., PDU 2, PDU 3) or may discard the remaining 2 PDUs. In this case, the remaining 2 PDUs may be the FEC PDUs. In other example, a third PDU set may comprise 5 PDUs (e.g., PDU 10, PDU 11, PDU 12, PDU 13, PDU 14). For example, for proper operation, the receiver needs to receive all PDUs of the third PDU set, in sequence. If one (e.g., PDU 12) is missing in the order, other following (subsequent) PDUs (e.g., PDU 13, PDU 14) may be useless to the receiver. The PDUs (e.g., PDU 13, PDU 14) which is later in sequence of a certain missing PDU (e.g., PDU 12) may be the FEC PDUs. E.g., when a certain condition is met, one or more PDUs that the transmitter is allowed to discard (e.g., not to send) may be the FEC PDUs. The FEC PDU may be an obsolete PDU, a repair PDU and / or the like. E.g., a type of the FEC PDU may be a FEC PDU type.

[0232] In the specification, the term “non-FEC PDU” may be a PDU which needs to be delivered to a receiver, and / or a PDU which is not FEC PDU. For example, a first PDU set may comprise 5 PDUs, and a receiver may need to receive at least 3 PDUs of the 5 PDUs. In this case, the at least 3 PDUs may be non-FEC PDUs. Or, until the at least 3 PDUs of the 5 PDUs are delivered to the receiver, all 5 PDUs may be non-FEC PDUs. Or, after the at least 3 PDUs of the 5 PDUs are delivered to the receiver, the at least 3 PDUs may be non-FEC PDUs. In other example, a second PDU set may comprise 4 PDUs, and 2 PDUs (e.g., PDU 0, PDU 1 ) of the 4 PDUs may comprise a critical information (e.g., information that the receive should receive) and remaining 2 PDUs (e.g., PDU 2, PDU 3) may comprise an optional information. In this case, the receives needs to receiver the 2 PDUs (e.g., PDU 0, PDU 1) and the 2 PDUs (e.g., PDU 0, PDU 1) are the non-FEC PDUs. These non-FEC PDUs may not be discarded, until reconfiguration of access stratum, and / or successful delivery. The FEC PDU may be a base PDU, a baseline PDU, a non-repair PDU, an essential PDU, a necessary PDU, and / or the like. E.g., a type of the non-FEC PDU may be a non-FEC PDU type.

[0233] In the specification, the term “FEC based handling” may be interpreted at least one of a configuration (of communication system level (e.g., below application layer)) related to supporting the FEC, sending (communication system level) information related to supporting the FEC, receiving information (communication system level) related to supporting the FEC, handling information related to the FEC, performing communication system level operation in accordance with configuration associated with supporting the FEC, and / or the like. For example, the FEC based handling may be a specific process, procedure, treatment, and / or like, that is performed in the communication system (e.g., a core network, a UE, an access network), with awareness of the FEC PDU and the non-FEC PDU. The FECbased handling may be FEC based PDU set handling, FEC based QoS handling, FEC-based PDU delivery, FEC- based PDU delivery control, FEC-based discarding, FEC-based scheduling, FEC-based indication, FEC-based deprioritizing, and / or the like.

[0234] In the specification, the term “PDU ratio” may be interpreted as a ratio of a first number of PDUs to a second number of PDUs. The PDU ratio may be used in supporting the FEC based handling. For example, the first number may be associated with a number of FEC PDUs, a number of non-FEC PDUs, a maximum (or minimum) number of PDUs to be discarded, a maximum (or minimum) number of PDUs to be allowed for discarding, a maximum (or minimum) number of PDUs needs to be transmitted, and / or the like. For example, the second number of PDUs may be associated with a total number of PDUs, and / or the like. For example, the first number and / or the second number may be calculated per QoS flow, per PDU set, per PSI, and / or the like. For example, a ratio may be a percent, a percentage, and / or the like.

[0235] In the specification, the term “header” may be a part in a PDU (or packet) which is not payload. The payload may comprise a user data, and / or an upper layer (entity) PDU. For example, the header may be and / or comprise one or more header fields. For example, the header may sometimes be interpreted as a header field and / or the header field may be interpreted as a header. For example, the header may be a RTP header, a RTP extension header, a FEC header, and / or the like. For example, a RTP header may comprise one or more header fields. A header fields may be a header field of the one or more header fields, one or more of the one or more header fields, and / or all header fields. The header field in the PDU may be set to a value. Based on the value of the header field, different behavior and / or different interpretations may be performed / triggered by a receiver of the PDU.

[0236] In the specification, the term “FEC header” may be a header associated with the FEC. For example, the FEC header may indicate one or more information for the FEC. For example, the FEC header of a PDU may indicate whether the PDU is a FEC PDU and / or non-FEC PDU. For example, the FEC header may indicate one or more ratio associated with the FEC based handling.

[0237] In the specification, the term “protocol description” may be interpreted as an information related to identification of FEC PDUs among one or more PDUs, identification of non-FEC PDUs among one or more PDUs, and / or an information used to acquire FEC-related information (e.g., type, ratio). E.g. , a transmitter (or a node, a communication entity, an entity other than the application layer) may determine whether a PDU is FEC PDU or not, based on the protocol description. For example, if the protocol description indicates a header field A of a protocol B, the transmitter uses (check, evaluate) the field A of the protocol B of the PDU to identify whether the PDU is the FEC PDU or not. For example, the protocol description may indicate one or more header field that a generating entity of the PDU uses to indicate the FEC PDU and / or the non-FEC PDU. For example, the protocol description may indicate a header, an extension header, a payload type of the service flow. The header, the extension header, and / or the payload type may be used for identifying (determining, checking) one or more FEC PDUs of a service flow and / or one or more FEC PDUs of a PDU set. For example, the protocol description may indicate a transport protocol. For example, the header and / or the extension header may be associated with the transport protocol. The indication of the transport protocol mayhelp in reducing overhead of identifying. For example, a PDU may comprise an IP packet. The IP packet may comprise a UDP packet. The UDP packet may comprise a RTP packet. The RTP packet may comprise a NAL packet. If the protocol description does not indicate a specific transport protocol, the entity may not know which header field of which transport protocol (e.g., IP, UDP, RTP, NAL) to look at. For example, if the transport protocol is RTP / SRTP, the header may be an RTP / SRTP header. For example, the protocol description may indicate the transport protocol (e.g. RTP / SRTP), transport protocol header extensions (e.g. RTP Header Extension), payload type and format (e.g. H.264, H.265) used by a PDU (e.g., FEO PDUs, non-FEO PDUs), a header field in the header (or header extension). For example, the protocol description may indicate one or more values of the header (header extension) of the transport protocol. If a value of the header of the transport protocol of a PDU is set to one of the one or more values, the UE (or other network node) may determine that the PDU is a FEO PDU type. Otherwise, the UE may determine that the PDU is non-FEO PDU type. For example, the protocol description may indicate a specific header of one or more headers of the transport protocol (among the one or more transport protocols in the PDU). In this case, for a PDU to transmit, the transmitter may check the specific header and / or may check a value of the specific header, to determine (e.g., identify) whether the PDU is a FEO PDU type or not. For example, the protocol description may be a FEO protocol description, a FEO PDU protocol description, a protocol description for the FEO based handling. For example, the protocol description may be separated into a first protocol description and / or a second protocol description. For example, the first protocol description may be associated with the FEO based handling and / or the second protocol description may be not associated with the FEO based handling.

[0238] In an example, indication (e.g., indicate) may be achieved in various ways. For example, a first indication may be done via a first field in a first signalling (e.g., a message). Alternatively and / or additional, a second indication may be done by not including the first field in the first signalling. For example, if a first message comprises the first field, the first indication may be done (e.g., achieved, delivered from a sender to a receiver). For example, if the first field in the first message is set to a value A, a third indication may be done. For example, if the first message does not comprise the first field, the second indication may be done. In other example, a fourth indication may be done by sending a second signalling. Alternatively and / or additionally, a fifth indication may be done by not sending the second signalling (e.g., a message). For example, the sender can indicate something, by sending a message comprising an indicator (e.g., an information element) indicating the information. For example, when a first entity indicates to a second entity about first something, the first entity may send to the second entity, an indicator (e.g., an information element) indicating the first something, and / or may send to the second entity, a message comprising the indicator. In other example, when a first entity does not indicate to a second entity about second something, the first entity may not send to the second entity, a first indicator (e.g., an information element) indicating the second something, may not send to the second entity, a message comprising the first indicator, and / or may send to the second entity, a second indicator indicating that the second something does not apply.

[0239] FIG. 20 depicts one example embodiment of the present disclosure. In an example, a UE may receive from a base station, a RRC message comprising one or more parameters configuring discarding FEO PDUs (e.g., FEO basedhandling). This may help a UE determine whether discarding FEC PDUs are used or not (or will be activated or not), during communication. In an example, after configuring, a UE may receive from the base station, a MAC CE activating the discarding the FEC PDUs. This may help in preventing unnecessary discarding of the FEC PDUs.

[0240] In an example, the UE may receive from the base station (e.g., a base station CU), the RRC message configuring the discarding FEC PDUs. For example, the configuring the discarding FEC PDUs may be setting up the FEC based handling and / or providing information (one or more parameters) to perform the FEC based handling. For example, the RRC message may be at least one of a RRC Setup message, a RRC Reconfiguration message, a DL RRC transport message, and / or the like. For example, if the base station determines to use the FEC based handling, the RRC message may comprise the one or more parameters associated with (e.g., configuring) the FEC based handling. For example, the one or more parameters may be at least one of a PDCP-Config, a MAC-CellGroupConfig, a UL-Trafficlnfo, a PDU-SessionUL-TrafficInfo, UEAssistancelnformation, and / or the like. For example, the one or more parameters may indicate whether the FEC based handling is configured (e.g., used, setup) for an RB (or a PDCP entity, or a PDU session, or a QoS flow) or not. For example, if the FEC based handling is configured for a first RB, the UE may receive one or more MAC CE associated with the FEC based handling and / or the UE may or may not send one or more FEC PDUs of the first RB, depending on activation status of the FEC based handling. For example, if the FEC based handling is not configured for a second RB, the UE may not receive one or more MAC CE associated with the FEC based handling for the second RB and / or the UE may not need to perform a step to determine whether to send one or more FEC PDUs of the second RB. The configuring may assist the UE to determine which RB needs FEC based handling or not, preventing waste of UE internal resources (e.g., reserving a resource to handle activation command). If the UE is not configured for the FEC based handling, the UE may discard, if any, a received MAC CE associated with FEC based handling. For example, the one or more parameters may comprise a first parameter indicating the first RB for which the FEC based handling applies and / or a second parameter indicating a maximum ratio of FEC discarding. For example, the second parameter may be used also to indicate that the FEC based handling applies. For example, the maximum ratio of the FEC discarding may indicate at least one of:

[0241] - how many PDUs of the first RB (e.g., a first PDCP entity, a first logical channel, a first RLC channel, a first QoS flow, a first PDU session) the UE is allowed to discard, for the FEC based handling or when the FEC based discarding is activated. For example, when the FEC PDU discarding (e.g., FEC-based discarding, FEC-based handling) is activated after configuration, and if this indicates 10 PDUs out of 100 PDUs, the UE may discard up to 10 FEC PDUs out of 100 FEC PDUs (alternatively and / or additionally 100 PDUs). For example, when the FEC PDU discarding (e.g., FEC-based discarding, FEC-based handling) is not activated (or deactivated) after configuration, the UE may not discard the FEC PDUs and / or may try to send the FEC PDUs. For example, this may indicate how many PDUs (e.g., or FEC PDUs) are subject to FEC based handling. This may be indicated per a PSI, per a PDU set. E.g., for PDUs of PDU sets of PSI=1 , a first number may be used while for PDUs of PDU sets of PSI=0, a second number may be used.

[0242] - how many percent (ratio) of PDUs of a PDU set, the UE is allowed to discard for FEC based handling. For example, if FEC based discarding is activated after configuration, and if the percent indicates 20 percent, the UE maydiscard up to 20 percent of FEC PDUs stored (buffered) in a PDCP entity (and / or RLC entity) and / or the UE may send the remaining FEC PDUs. For example, this can be indicated per PSI. E.g., for PDU sets of PSI=0, this may indicate 50%, for PDU sets of PSI=1 , this may indicate 70%.

[0243] - how many PDUs (or percent) of a PDU set is allowed to be discarded, for FEC based handling or when the FEC based discarding is activated. For example, when FEC PDU discarding is activated after configuration, and if this indicates 2 PDUs, the UE may discard up to 2 PDUs of one or more PDUs of a PDU set. If this indicates 50 %, the UE may discard up to 2 PDUs of a PDU set (comprising 4 PDUs). For example, this can be indicated per PSI.

[0244] In an example, the UE (e.g., a PDCP layer / entity) may receive one or more PDUs for the first RB, from the application layer of the UE. The first RB may be setup (established, configured) to support the FEC based handling. For example, the RRC message may indicate that the FEC based handling applies to the first RB (or a first PDCP entity, a first PDU session, a first logical channel, and / or the like). For example, an entity (e.g., the first PDCP entity) of the UE may receive the one or more PDUs from an upper layer (e.g., a NAS layer, an application layer, a SDAP layer). For example, the one or more PDUs may be one or more PDCP SDUs. The entity may store the one or more PDUs in the buffer. For example, until the entity receives an indication that a PDU (or a PDCP PDU / SDU associated with the PDU) is delivered successfully, the entity may keep the PDU in the buffer. For example, until the PDU is discarded, the entity may keep the PDU in the buffer (e.g, memory).

[0245] In an example, the UE may initiate sending the one or more PDUs to a receiver (e.g., a base station). For example, if the base station allocates enough resources to the UE, the UE may be able to transmit / send all of the one or more PDUs to the base station. For example, the FEC based handling (e.g., FEC based discarding) is not activated (remains deactivated) after the FEC based handling is configured, the UE may transmit one or more FEC PDUs and / or the one or more non-FEC PDUs. For example, the UE may receive from the application of the UE, PDU 1 , PDU 2, PDU 3, PDU 4. The PDU 1 and the PDU 2 may be the non-FEC PDU type. The PDU 3 and the PDU 4 may be the FEC PDU type. Because the FEC based handling is not activated, the UE may send to the base station, the PDU 1, the PDU 2, the PDU 3, and the PDU 4.

[0246] In an example, the base station may determine whether a resource (e.g., a UL resources, a UL radio resources, UL network resources, and / or the like) congestion (e.g., shortage) occurs. For example, if a first amount of resource requested by one or more UEs in a cell exceeds a second amount that the base station can provide to the one or more UEs, the base station may determine that the resource is congested. After determining that the resource is congested, the base station may determine to activate the FEC based handling. For example, the base station may determine to activate the FEC based handling to one or more UEs which are configured with the FEC based handling, and / or the base station may identify the one or more UEs which are configured with the FEC based handling. For example, the base station may send one or more activation messages (e.g., a MAC CE, a DL PDCP PDU) to the one or more UEs. For example, the base station may not send the one or more activation messages to a UE not configured with the FEC based handling.

[0247] In an example, an activation message of the one or more activation message may comprise an indication thatthe FEC based handling is activated for the UL. For example, the indication may be that the UE needs to apply (activate, start) the FEC based handling for UL, that the UE needs not to send one or more FEC PDUs, that the UE needs to send one or more non-FEC PDUs, that the UE needs to discard the one or more FEC PDUs, and / or the like. For example, the activation message may be at least one of a MAC CE (e.g., FEC based handling (discarding) activation / deactivation MAC control element), a PDCP Data PDU (e.g., PDCP Data PDU comprising a user data and / or a field indicating FEC based handling activation / deactivation), a PDCP Control PDU (e.g., a PDCP control PDU indicating activation / deactivation of the FEC based handling), and / or the like.

[0248] In an example, the UE may receive the activation message. For example, the activation message may indicate that the FEC based handling is activated for the first RB. For example, based on the FEC based handling is activated, and / or based on receiving activation of the FEC based handling, the UE (e.g., the entity) may send to the base station, one or more non-FEC PDUs and / or may not send one or more FEC PDUs. For example, the UE may receive from the application, one or more PDUs. For example, the one or more PDUs (PDU 5, PDU 6, PDU 7, PDU 8) may or may not be of a same PDU set. For example, the PDU 5 and the PDU 6 may be of the non-FEC PDU type and / or the PDU 7 and the PDU 8 may be the FEC PDU type. Because the FEC based handling is activated and / or because the PDU 5 and the PDU 6 is the non-FEC PDU type, the UE may send the PDU 5 and the PDU 6 to the base station. Because the FEC based handling is activated and / or because the PDU 7 and the PDU 8 is the FEC PDU type, the UE may not send the PDU 7 and the PDU 8 to the base station. Additionally and / or alternatively, because the FEC based handling is activated and / or because the PDU 7 and the PDU 8 is the FEC PDU type, the entity may determine to discard one or more PDUs (the PDU 7 and the PDU 8) of the FEC PDU type. For example, discarding of a PDU may be removing the PDU from the buffer, sending to a lower entity (e.g., a RLC entity) an indication that the PDU (e.g., PDCP SDU associated with the PDU, PDCP PDU associated with the PDU) is discarded, not sending the PDU, stopping sending the PDU, stopping attempt to send the PDU, deleting the PDU from a memory, de-prioritizing transmission of the PDU and / or the like. For example, de-prioritizing transmission of the PDU may be transmitting a PDU of a non-FEC PDU type before transmitting a PDU of a FEC PDU type. For example, de-prioritizing transmission of the PDU may be transmitting a PDU of a FEC PDU, if there is no other non-FEC PDU to transmit.

[0249] The example of FIG. 20 may help a network control use of uplink (UL) resources. For example, during a time when the uplink resource is in shortage, the base station may activate the FEC based handling. This may reduce transmission of FEC PDUs and may alleviate resource congestion. Use of the activation message for the FEC based handling may assist faster control of the FEC based congestion. Separation of the RRC message for configuration of the FEC based handling and the activation message may help in reducing delay of the activation of the FEC based handling.

[0250] FIG. 21 depicts one example embodiment of the present disclosure. In an example, a UE may receive from a base station, an inquiry requesting information of whether the UE supports the discarding FEC PDUs (e.g., FEC based handling, of a PDU set). This may help the base station to determine which UE supports discarding FEC PDUs and command the UE, in case of radio resource congestion, to reduce the congestion. An activation message maycomprise an indication of a ratio of the discarding FEC PDUs. This may help avoiding discarding FEC PDUs more than necessary. It is because discarding more FEC PDUs than necessary may degrade service quality of an application. For brevity, based on the other part of the present disclosure, redundant details will be omitted.

[0251] In an example, the base station (e.g., base station central unit) may send a first RRC message, to the UE. For example, the first RRC message may at least of one of a U ECapability Enqu iry and / or the like. For example, the first RRC may request the UE to send information of the UE, supported capability of the UE, information indicating whether access stratum (AS) layer of the UE supports the FEC based discarding, handling of an activation message, the FEC based delivery, and / or the like.

[0252] In an example, the UE may receive from the base station, the first RRC message. In response to receiving the first RRC message, the UE may send a second RRC message. For example, the second RRC message may be a UECapabilitylnformation, and / or the like. For example, the second RRC message may indicate supported functionalities (capabilities) of the AS layer of the UE. For example, because the UE supports at least one of handling a FEC-based handling activation / deactivation MAC CE, discarding one or more FEC PDUs, the second RRC message may indicate at least one of that the AS layer (e.g., RRC, PDCP, MAC, RLC, PHY) of the UE supports the FEC based handling, FEC based discarding by the PDCP, MAC CE associated with the FEC based handling, and / or the like, the UE may send the second RRC message indicating the support of the FEC based handling. For example, the second RRC message may comprise one or more indicators indicating whether each functionality of the functionalities is supported or not. (e.g., one indicator for handling a FEC-based handling activation / deactivation MAC CE, one indicator for discarding one or more FEC PDUs, and / or the like).

[0253] In an example, the base station may receive the second RRC message. Based on receiving the second RRC message, the base station may determine whether to configure the FEC based handling to the UE. For example, because the UE supports the FEC based handling (e.g., if the second RRC message indicates support of the FEC based handing), the base station may determine to configure the UE with one or more parameters for the FEC based handling and / or the base station may send the RRC message (e.g., as shown in FIG. 20). For example, if the UE does not support the FEC based handling (e.g., if the second RRC message does not indicate support of the FEC based handing), the base station may determine not to configure the UE with one or more parameters for the FEC based handling, and / or the base station may send a third RRC message not comprising one or more parameters associated with the FEC based discarding.

[0254] In an example, the base station may determine that the resource is congested. After determining that the resource is congested, the base station may determine to activate the FEC based handling. For example, the base station may send the activation messages (e.g., a MAC CE, a DL PDCP PDU) to the UE.

[0255] In an example, alternatively and / or additionally, the activation message may comprise information of the maximum ratio of the FEC discarding. For example, if the RRC message does not comprise the maximum ratio of the FEC discarding, the base station may send information of the maximum ratio of the FEC discarding via the activation message. In another example, the maximum ratio of the FEC discarding of the RRC message may be set to a firstvalue. When the base station determines to send the activation message, the base station may determine to use a second value for the maximum ratio of the FEC discarding. In this case, the activation message may comprise the second value for the maximum ratio of the FEC discarding. This may help the UE to use the latest value fitting to the congestion.

[0256] In an example, the UE may receive the activation message. For example, the activation message may comprise the maximum ratio (e.g., a value) of the FEC discarding. In response to receiving the maximum ratio, the UE may determine to send one or more first FEC PDUs and / or may not send (e.g., discard) one or more second FEC PDUs. For example, a number of the one or more first FEC PDUs and / or a number of the one or more second FEC PDUs may be determined based on the maximum ratio.

[0257] For example, the maximum ratio may indicate a first ratio. For example, the first ratio may indicate a first number (or an amount, a percentage, and / or the like) of FEC PDUs that needs to be transmitted, and / or a second number of FEC PDUs that needs to be discarded, among total FEC PDUs. For example, the total FEC PDUs may be at least one of all FEC PDUs in the buffer, all FEC PDUs not yet transmitted, all FEC PDUs not yet acknowledged, all PDUs of a PDU set, all PDUs of a QoS flow, all PDUs of a PDU session, all PDUs stored in the buffer, all PDUs needs to be delivered to the receiver, and / or the like. For example, if the first number is 20 %, 1 out of 5 FEC PDUs (of a PDU set, of a QoS flow, of PDUs in the buffer, of PDUs of the QoS flow, and / or the like) may be discarded and / or may not be transmitted. For example, if the second number is 80 %, 4 out of 5 FEC PDUs (of a PDU set, of a QoS flow, of PDUs in the buffer, of PDUs of the QoS flow, and / or the like) may be transmitted. For example, if the first number is 1 , 1 FEC PDU out of FEC PDUs (of a PDU set, of a QoS flow, of PDUs in the buffer, of PDUs of the QoS flow, and / or the like) may be discarded and / or may not be transmitted. For example, if the second number is 2, 2 FEC PDUs out of FEC PDUs (of a PDU set, of a QoS flow, of PDUs in the buffer, of PDUs of the QoS flow, and / or the like) may be transmitted, while other may be discarded (or not transmitted).

[0258] In an example, the activation message may comprise an indication indicating that FEC-based discarding applies for the first RB and / or an indication that the ratio (the maximum ratio of FEC discarding) is 1 / 3. The UE (e.g., the first entity, e.g., PDCP) may receive one or more PDUs (e.g., one or more non-FEC PDUs (e.g., PDU 5, PDU 6), one or more FEC PDUs (e.g., PDU 7, PDU 8, PDU 9). Because the ratio is 1 / 3, the UE may send 1 / 3 (e.g., PDU 7) of FEC PDUs and / or may discard 2 / 3 (e.g., 1-1 / 3) (e.g., PDU 8, PDU 9) of FEC PDUs. Alternatively, because the ratio is 1 / 3, the UE may send 2 / 3 (e.g., PDU 7, PDU 8) of FEC PDUs and / or may discard 1 / 3 (e.g., PDU 9) of FEC PDUs.

[0259] The example of FIG. 21 may help a network control use of uplink (UL) resources. For example, based on radio resource availability, and based on the maximum ratio, the base station can support transmission of FEC PDUs as much as possible, while minimizing radio resource congestion.

[0260] In the example of FIG. 21, a behavior using the maximum ratio of FEC discarding is described. Alternatively, a minimum ratio of FEC discarding can be used instead of the maximum ratio of FEC discarding. E.g., when the maximum ratio is used, the UE may discard the FEC PDUs up to the maximum ratio. E.g., when the minimum ratio is used, the UE may discard the FEC PDUs more than the minimum ratio.

[0261] FIG. 22 depicts one example embodiment of the present disclosure. In an example, a UE may perform a FEO based discarding based on receiving an activation message. If more radio resource (e.g. , enough to support also FEO PDUs) becomes available, a base station may send a deactivation message, to deactivate the FEO based discarding (e.g., FEO based handling). This may help in minimizing a time during which FEO PDUs are discarded. For brevity, based on the other part of the present disclosure, redundant details will be omitted.

[0262] In an example, the base station may send the activation message. The UE may discard one or more FEO PDUs and / or may not send the one or more FEO PDUs.

[0263] In an example, the base station may determine whether a resource (e.g., a UL resources, a UL radio resources, UL network resources, and / or the like) congestion (e.g., shortage) stops. For example, if a third amount of resource requested by one or more UEs in a cell does not exceed a fourth amount that the base station can provide to the one or more UEs, the base station may determine that the resource is no more congested. After determining that the resource is not congested, the base station may determine to deactivate the FEO based handling. For example, the base station may send one or more deactivation messages (e.g., a MAC CE, a DL PDCP PDU) to the one or more UEs configured for FEC based handling.

[0264] In an example, a deactivation message of the one or more deactivation message may comprise an indication that the FEC based handling is deactivated (not active) for the UL. For example, the indication may be that the UE needs to stop applying (using) the FEC based handling for UL, that the UE needs to send one or more FEC PDUs, that the UE needs not to discard the one or more FEC PDUs, and / or the like. For example, the deactivation message may be at least one of a MAC CE (e.g., FEC based handling (discarding) activation / deactivation MAC control element), a PDCP Data PDU (e.g., PDCP Data PDU comprising a user data and / or a field indicating FEC based handling activation / deactivation), a PDCP Control PDU (e.g., a PDCP control PDU indicating activation / deactivation of the FEC based handling), and / or the like.

[0265] In an example, the UE may receive the deactivation message. For example, the deactivation message may indicate that the FEC based handling is not active for the first RB. For example, the deactivation message may comprise an identifier of the first RB and / or the indication to deactivate. For example, based on the FEC based handling is deactivated (e.g., not activated, not active), and / or based on receiving deactivation of the FEC based handling, the UE (e.g., the entity) may send to the base station, one or more non-FEC PDUs, may send one or more FEC PDUs, may not discard the one or more FEC PDUs. For example, the UE may receive from the application, one or more PDUs. For example, the one or more PDUs (PDU 10, PDU 11, PDU 12, PDU 13, PDU 14) may or may not be of a same PDU set. For example, the PDU 10 and the PDU 11 may be of the non-FEC PDU type and / or the PDU 12, PDU 13 and the PDU 14 may be the FEC PDU type. Because the FEC based handling is deactivated (e.g., not active) and / or because the PDU 10 and the PDU 11 is the non-FEC PDU type, the UE may send the PDU 10 and the PDU 11 to the base station. Because the FEC based handling is not active and / or because the PDU 12, the PDU 13 and the PDU 14 is the FEC PDU type, the UE may send the PDU 12, the PDU 13, and the PDU 14 to the base station. Additionally and / or alternatively, because the FEC based handling is deactivated, the entity may determine not todiscard one or more PDUs (the PDU 12, the PDU 13 and the PDU 14) of the FEC PDU type.

[0266] Alternatively and / or additionally, the one or more parameter of the RRC message may comprise a timer value for deactivation of the FEC based handling. For example, when the UE receives the activation message, the UE may start a timer with the timer value. When the UE receives the deactivation message, the UE may stop the timer. When the timer expires, the UE may act as if the deactivation message is received. For example, when the timer expires, the UE may deactivate the FEC-based handling. This may allow the base station to control activation / deactivation of the FEC-based handling, without sending the deactivation message.

[0267] The example of FIG. 22 may help a network control use of uplink (UL) resources and prevent unnecessary discarding.

[0268] FIG. 23 depicts one example embodiment of the present disclosure. In an example, an activation message may comprise an information indicating one or more PDUs to which FEC based handling applies. This may help the UE to prevent the FEC based handling applied to irrelevant PDUs. For brevity, based on the other part of the present disclosure, redundant details will be omitted.

[0269] In an example, the base station may send the activation message. For example, the activation message may comprise information (e.g., PSI=1 , PSI=0, etc.) indicating one or more PSIs. For example, the activation message may comprise a value (e.g., 1 , 0, high importance, low importance) of a PSI of the one or more PSIs. For example, based on the information, the UE may identify one or more first PDUs. For the one or more first PDUs, the UE may apply the FEC based handling. For example, if the value indicates 1 (e.g., the activation message indicates PSI= 1 , e.g., comprises an identifier of the PSI), the UE may apply the FEC based handling to the one or more first PDUs of one or more first PDU sets whose PSI value is 1. For example, if the activation message does not indicate PSI=0, and / or if the value of the PSI in the activation message does not indicate 0, the UE may not apply the FEC based handling to one or more second PDUs of one or more second PDU sets whose PSI is 0. For example, based on that PSI=1 is indicated in the activation message, the UE may discard one or more FEC PDUs of the one or more first PDU sets and / or may not send the one or more FEC PDUs of the one or more first PDU sets. For example, based on that PSI=0 is not indicated in the activation message, the UE may not discard one or more second FEC PDUs of the one or more second PDU sets and / or may send the one or more second FEC PDUs of the one or more second PDU sets.

[0270] In an example, the UE may receive one or more PDUs from the application. For example, the one or more PDUs may comprise one or more third PDUs (e.g., PDU 5, PDU 6, PDU 7, PDU 8, PDU 9) and / or one or more fourth PDUs (e.g., PDU 10, PDU 11, PDU 12, PDU 13, PDU 14). For example, a third PDU set may comprise the one or more third PDUs, and / or may be associated with a third PDU set importance (e.g., the PSI=1 ). For example, a fourth PDU sets may comprise the one or more fourth PDUs, and / or may be associated with a fourth PDU set importance (e.g., the PSI=0) . The one or more PDUs may comprise one or more FEC PDUs and / or one or more non-FEC PDUs. For example, the one or more non-FEC PDUs comprise one or more third non-FEC PDUs (e.g., PDU 5, PDU 6) and / or one or more fourth non-FEC PDUs (e.g., PDU 10, PDU 11). For example, the one or more FEC PDUs comprise one or more third FEC PDUs (e.g., PDU 7, PDU 8, PDU 9) and / or one or more fourth FEC PDUs (e.g., PDU 12, PDU 13, PDU14). In an example, based on receiving the activation message indicating the PS1 1, the UE may determine to apply the FEC-based handling to the third PDU set (e.g., one or more PDU sets of PSI=1 ). For example, the UE may discard one or more FEO PDUs of the one or more third FEO PDUs. For example, based on that the ratio of the activation message indicates a ratio (e.g., the maximum ratio of FEO discarding, 1 / 3), the UE may discard 2 / 3 of the one or more third FEO PDUs (e.g., discard the PDU 8 and / or the PDU 9). In an example, based on receiving the activation message indicating the PS1 1 (e.g., not indicating PSI=0), the UE may determine not to apply the FEC-based handling to the fourth PDU set. For example, the UE may not discard one or more FEC PDUs of the one or more fourth FEC PDUs and / or may send the one or more fourth FEC PDUs, to the base station.

[0271] In other example, the activation message may comprise one or more ratios and / or one or more PSIs. This may help the base station to control more than one RBs with the activation message. For example, the one or more ratios may comprise a fifth ratio and / or a sixth ratio. For example, the one or more PSIs may comprise a fifth PSI and / or a sixth PSI. For example, the fifth ratio may be associated with the fifth PSI and / or the sixth ratio may be associated with the sixth PSI. In this case, the UE may apply the FEC based handling to one or more sixth FEC PDUs of one or more sixth PDU sets (e.g., PSI=6) with the sixth ratio. In this case, the UE may apply the FEC based handling to one or more fifth FEC PDUs of one or more fifth PDU sets (e.g., PSI=5) with the fifth ratio.

[0272] The example of FIG. 23 may help a network control congestion, minimizing unnecessary discarding.

[0273] FIG. 24 depicts one example embodiment of the present disclosure. In an example, a base station may indicate one or more conditions (e.g., criterion) for activating FEC based handing. This may help in resolving radio congestion, in situation where the base station cannot send an activation command to the UE. For brevity, based on the other part of the present disclosure, redundant details will be omitted.

[0274] In an example, the UE may receive from the base station (e.g., a base station CU), the RRC message configuring the discarding FEC PDUs (e.g., FEC based handling). The RRC message may comprise a condition information. For example, the condition information may indicate the one or more condition when the UE starts (activates) the FEC based handling and / or when the UE stops (deactivates) the FEC based handling. For example, the one or more conditions may comprise at least one of:

[0275] - a time duration (e.g., a timer period) for a FEC PDU. For example, when a FEC PDU is buffered, the UE may start the time duration for the FEC PDU. When the time duration expires, the UE may activate the FEC based handling (e.g., discard the FEC PDU).

[0276] - a FEC PDU ratio. This may indicate a ratio of a number of FEC PDUs to all PDUs. For example, if a number of buffered PDUs is 100, if a number of FEC PDUs among the buffered PDUs is 60, and / or if the ratio is 50%, because there is more FEC PDUs (60%) than the ratio (e.g., 50%), the UE may activate the FEC based handling (e.g., discard one or more FEC PDUs of the FEC PDUs). In another example, this may be applied for a PDU set. For example, if a percent (number) of FEC PDUs in a PDU set exceed the value indicated by the FEC PDU ratio, the UE may activate the FEC based handling (e.g., discard one or more FEC PDUs of the PDU set).

[0277] - a buffer amount. This may indicate a value associated with an amount (bytes, numbers) of PDUs buffered inthe UE. For example, if the amount of PDUs buffered in the UE exceeds this value, UE may activate the FEC based handling. For example, the UE may discard one or more FEC PDUs in the buffer.

[0278] - a delay. This may indicate an average delay of transmission from the UE to the base station. For example, if the average delay (e.g., 100 ms) of transmission of PDUs exceeds a value (e.g., 90 ms) of the delay, the UE may activate the FEC based handling.

[0279] In an example, the RRC message may further indicate one or more RBs, one or more logical channel, one or more RLC channels, for which the one or more conditions applies, and / or for which the FEC based handling applies. For example, the RRC message may indicate that the FEC based handling applies to the first RB, while the FEC based handling does not applied to a second RB. For example, the RRC message may comprises one or more identifiers of the RB for which the FEC based handling applies.

[0280] In an example, based on the RRC message (e.g., the one or more condition) the UE may determine whether the FEC based handling should be activated and / or deactivated. Based on whether the one or more conditions are met or not, if the UE determines that the FEC based handling needs to be activated, and / or after the FEC based handling is activated, the UE may send to the base station, a message indicating that FEC based handling is activated in the UE. This message may help the base station to determine whether one or more FEC PDUs are discarded in the UE, and / or whether the one or more FEC PDUs are missing due to a problem over air interface. For example, the message indicating that the FEC based handling is active in the UE may be a MAC CE status indicating the FEC-based handling be active, a PDCP PDU status indicating the FEC-based handling being active, and / or a RRC message status indicating the FEC-based handling being active.

[0281] In an example, the UE may start activation of the FEC based handling, when the RRC message is received and / or when the RRC message comprises an activation indication indicating the FEC based handling being activated. In other example, the base station may send to the UE, another RRC message without the one or more parameter configuring the FEC based handling, and / or the another RRC message may comprise an indication indicating deactivation of the FEC based handling. When the UE received the another RRC message, the UE may deactivate the FEC based handling. This may be used when the base station does not often change from activation to deactivation and / or from deactivation from the activation.

[0282] FIG. 25 depicts one example embodiment of the present disclosure. In an example, one or more parameters of the RRC message may comprise one or more time values. For example, the one or more time values may assist a UE to determine when to discard one or more FEC PDUs. This may help in resolving resource congestion, when the base station cannot send an activation command to the UE. For brevity, based on the other part of the present disclosure, redundant details will be omitted.

[0283] In an example, the UE may receive from the base station (e.g., a base station CU), the RRC message configuring the discarding FEC PDUs (e.g., FEC based handling). The RRC message may comprise the one or more parameters. The one or more parameters may comprise the one or more time values. For example, the one or more time values may comprise at least one of:

[0284] - a first time value: This may indicate a time value for a PDU (e.g., PDCP SDU) discard timer. The first time value may be used for one or more PDUs (e.g., of a PDU sets) when the FEC-based handling is not activated. The first time value may be used for one or more non-FEO PDUs (e.g., of a PDU sets) when the FEC-based handling is activated.

[0285] - a second time value: This may indicate a time value for a PDU (e.g., PDCP SDU) discard timer. The second time value may be used for one or more PDUs (e.g., of a PDU sets) when the FEC-based handling is activated. The second time value may be used for one or more FEC PDUs (e.g., of a PDU sets) when the FEC-based handling is activated.

[0286] In an example, the UE may receive the activation message indicating activation of the FEC based handling.

[0287] In an example, the UE may receive one or more PDUs (e.g., PDU 1 , PDU 2, PDU 3, PDU 4) from the application. For example, the one or more PDUs may comprise one or more non-FEC PDUs (e.g., PDU 1, PDU 2) and / or one or more FEC PDUs (e.g., PDU 3, PDU 4). For example, the UE may receive the one or more non-FEC PDUs at T=tO and / or the one or more FEC PDUs at T=t1. Because the FEC based handling is active, the UE may start one or more first timers for the one or more non-FEC PDUs, with a first timer value set to the first time value (e.g., TA). Because the FEC based handling is active, the UE may start one or more second timers for the one or more FEC PDUs, with a second timer value set to the second time value (e.g., TB). For example, because a non-FEC PDU type is prioritized than a FEC PDU type, the first time value may be longer (bigger, larger, higher) than the second time value.

[0288] In an example, the UE may try to transmit the one or more FEC PDUs. Because enough radio resources are not allocated due to congestion, the UE may not be able to deliver the one or more FEC PDUs to the base station until the one or more second timer expire. For example, the UE may not be able to transmit the one or more FEC PDUs to the base station until t=t1 +TB. When the one or more second timers expire, the UE may discard the one or more FEC PDUs. For example, when a second timer (e.g., a timer associated with the PDU 3) of the one or more second timers expires, the UE may discard a PDU (e.g., the PDU 3) associated with the second timer. When the one or more second timers expire, the UE may discard the one or more FEC PDUs.

[0289] In an example, the UE may try to transmit the one or more non-FEC PDUs. If some resources are allocated, the UE may be able to transmit the one or more non-FEC PDUs to the base station before the one or more first timers expire. For example, when the one or more non-FEC PDUs are delivered to the base station, the UE may stop the one or more first timers. In another example, if some resources are not allocated, the UE may not be able to transmit the one or more non-FEC PDUs to the base station before the one or more first timers expire. For example, when the one or more first timers expire, the UE may discard the one or more non-FEC PDUs.

[0290] In an example, the UE may receive the deactivation message indicating deactivation of the FEC based handling.

[0291] In an example, the UE may receive one or more second PDUs (e.g., PDU 5, PDU 6, PDU 7, PDU 8) from the application. For example, the one or more PDUs may comprise one or more non-FEC PDUs (e.g., PDU 5, PDU 6) and / or one or more FEC PDUs (e.g., PDU 7, PDU 8). For example, the UE may receive the one or more non-FECPDUs at T=t2 and / or the one or more FEC PDUs at T=t3. Because the FEC based handling is de-active (deactivated, not activated), the UE may start one or more third timers for the one or more non-FEC PDUs, with a third timer value set to a third time value (e.g., may be same as the first time value). Because the FEC based handling is de-active, the UE may start one or more fourth timers for the one or more FEC PDUs, with a third timer value set to the third time value. For example, the RRC message may comprise the third time value. For example, the third time value may be used when the FEC based handling is not activated.

[0292] The example of FIG. 25 may help a network control use of uplink (UL) resources. Using different timer values for the FEC PDUs and / or the non-FEC PDUs, may help differentiated handling of the one or more PDUs while minimizing radio resource congestion.

[0293] FIG. 26 depicts one example embodiment of the present disclosure. In an example, a MAC CE may comprise an indication indicating activation of FEC based handling. This may help a base station to respond quickly in resolving resource congestion. For brevity, based on the other part of the present disclosure, redundant details will be omitted.

[0294] For example, the base station may send the activation message indicating activation of the FEC based handling. For example, the base station may send the deactivation message indicating deactivation of the FEC based handling. For example, the activation message and / or the deactivation message may be the MAC CE. The MAC CE may be at least one of FEC based handling (e.g., discarding) activation / deactivation medium access control (MAC) control element, and / or the like. For example, the activation message may comprise at least one of:

[0295] - a first field indicating a type of the MAC CE. For example, the first field may be at least one of a LCID field and / or an eLCID field. For example, if the first field indicates a first specific value (e.g., 1234, 10101010), the MAC CE may comprise one or more second fields indicating one or more activation / deactivation (e.g., FEC based handling) of one or more RBs.

[0296] - one or more second fields indicating the one or more activation / deactivation. For example, a second field of the one or more second fields (e.g., D7, D6, .... DO) may be associated with a RB (e.g., a PDCP entity, a RLC entity) of the one or more RBs. For example, if the second field is set to a second specific value (e.g., 1), the FEC based handling may be activated for the RB and / or the UE may apply the FEC based handling for the RB. For example, if the second field is set to a third specific value (e.g., 0), the FEC based handling may be deactivated for the RB and / or the UE may not apply the FEC based handling for the RB. For example, the activation / deactivation may indicate whether the UE needs to apply the FEC-based handling (e.g., FEC based discarding) for UL or not.

[0297] - one or more third fields indicating one or more maximum ratios of the FEC discarding. For example, a third field of the one or more third fields (e.g., ratio for D7, ratio for D6, .... ratio for DO) may be associated with the RB (e.g., a PDCP entity, a RLC entity) of the one or more RBs. For example, if the FEC based handling is activated for the RB (e.g., D7 is 1), the UE may apply a third value of the third field (e.g., the ratio for D7) as a maximum ratio of the FEC discarding for the RB.

[0298] In an example, the UE may receive the activation (and / or deactivation) message when the FEC based handling is configured. If the UE receives the activation message (e.g., the MAC CE), the UE may discard the MAC CE.

[0299] FIG. 27 depicts one example embodiment of the present disclosure. In an example, a UE may need to send a buffer status report to a base station, to get an uplink radio resources to transmit one or more PDUs. The buffer status report may be calculated based on whether a FEO based handling is activated or not. When the uplink radio resource is congested (e.g., short), this may help the base station to accurately allocate an amount of resources to the UE. For brevity, based on the other part of the present disclosure, redundant details will be omitted.

[0300] In an example, a first entity of the UE may receive from an application, one or more PDUs (e.g., PDCP SDUs). For example, the first entity (e.g., PDCP entity) may store the one or more PDUs in a first buffer. For example, the first entity UE may deliver one or more first data units (e.g., PDCP PDUs) to a second entity (e.g., a RLC entity). For example, each of the one or more first data units may be associated with each of one or more first PDUs of the one or more PDUs.

[0301] In an example, a second entity of the UE may receive the one or more first data units (e.g., one or more RLC SDUs). For example, the second entity of the UE may store the one or more first data units in a second buffer. For example, the second entity may send one or more second data units (e.g., one or more RLC PDUs). For example, each of the one or more second data units may be associated with a first data unit.

[0302] In an example, the UE may receive an activation message activating the FEC based handling.

[0303] In an example, the UE may determine one or more FEC PDUs of the one or more PDUs and / or one or more non-FEC PDUs of the one or more PDUs. In an example, the UE may determine (e.g., identify) a first set of the first data units. For example, the first set may be associated with the one or more FEC PDUs. In an example, the UE may determine (e.g., identify) a second set of the first data units. For example, the second set may be associated with the one or more non-FEC PDUs. In an example, the UE may determine (e.g., identify) a third set of the second data units. For example, the third set may be associated with the one or more FEC PDUs. In an example, the UE may determine (e.g., identify) a fourth set of the second data units. For example, the fourth set may be associated with the one or more non-FEC PDUs.

[0304] In an example, a third entity (e.g., a MAC entity) of the UE may request the first entity and / or the second entity, to report data volume of the first entity and / or the second entity.

[0305] For example, based on that the FEC-based handling is activated, the first entity may consider (include) for calculation (reporting) of a first data volume:

[0306] - one or more fifth non-FEC PDUs. Each of the one or more fifth non-FEC PDUs may be a PDU of a non-FEC PDU type, for which there is no associated a first data unit (e.g., the first data unit for the PDU is not constructed).

[0307] - one or more sixth first data units. Each of the one or more sixth first data unit may not be submitted to the second entity. The each of the one or more sixth first data unit may be associated with the non-FEC PDU type (e.g., comprises at least a portion of the non-FEC data type)

[0308] - one or more seventh control data unit (e.g., PDCP control PDUs).

[0309] For example, the first data volume may not consider a PDU (and / or a first data unit, a second data unit) associated with FEC data type.

[0310] For example, information of the first data volume that is reported from the first entity to the third entity may indicate a first amount of data considered for the first data volume.

[0311] For example, based on that the FEC-based handling is activated, the second entity may consider (include) for calculation (reporting) of a second data volume:

[0312] - one or more eighth first data units. Each of the one or more eighth first data units may be a first data unit for which there is no associated a second data unit (e.g., e.g., one or more portion of the first data unit may not yet be included in the second data unit). The each of the one or more eighth first data unit may be associated with the non- FEC PDU type (e.g., comprises at least a portion of the non-FEC data type)

[0313] - one or more ninth second data units. Each of the one or more ninth second data unit may be pending for initial transmission and / or retransmission. The each of the one or more ninth second data unit may be associated with the non-FEC PDU type (e.g., comprises at least a portion of the non-FEC data type)

[0314] For example, the second data volume may not consider a PDU (and / or a first data unit, a second data unit) associated with FEC data type.

[0315] For example, information of the second data volume that is reported from the second entity to the third entity may indicate a second amount of data considered for the second data volume.

[0316] In an example, the third entity may receive the information of the first data volume and / or the information of the second data volume. The third entity may construct a buffer status reporting MAC CE. The buffer status reporting may comprise an information of data amount in the UE. For example, the data amount in the UE may be based on the amount of data associated with the first data volume and / or the second data volume. For example, the data amount in the UE may not consider a data volume associated with FEC PDUs and / or the data amount in the UE may consider a data volume associated with non-FEC PDUs.

[0317] FIG. 28 depicts one example embodiment of the present disclosure. For brevity, based on the other part of the present disclosure, redundant details will be omitted.

[0318] In an example, a UE may send a first RRC message. The first RRC message may comprise an accessstratum capability indicator indicating that the UE supports the FEC-based handling. For example, the access-stratum capability indicator may assist a base station to determine whether to send a command to the UE, to activate the FEC- based handling. For example, the FEC-based handling may comprise at least one of sending / receiving a MAC CE associated with handling of a FEC PDU, discarding the FEC PDU, and / or the like.

[0319] In an example, the UE may receive the RRC message configuring the FEC-based handling.

[0320] In an example, the UE may determine whether the activation message (e.g., activating the FEC based handling) is received.

[0321] In an example, after the activation message is received, the UE may receive a PDU from an application. For example, the UE may determine whether the FEC-based handling (e.g., FEC based discarding) is deactivated or not. For example, if the FEC-based handling is not deactivated and / or if the FEC based handling is active (activated), the UE may determine whether the PDU is a FEC PDU type or not. If the PDU is the FEC PDU type, the UE may discardthe PDU, may not transmit the PDU, and / or may deprioritize the transmission of the PDU. For example, deprioritizing the transmission of the PDU may be sending non-FEO PDU before sending the FEO PDU.

[0322] In an example, after the activation message is received, the UE may receive a PDU from an application. For example, the UE may determine whether the FEC-based handling (e.g., FEO based discarding) is deactivated or not. For example, if the FEC-based handling is deactivated and / or if the FEC based handling is not active (activated), the UE may send the PDU to the base station.

[0323]

[0324] In an example, a wireless device (e.g., a UE) may receive from a base station, a radio resource control (RRC) message indicating that discarding forward-error-correction (FEC) protocol data units (PDUs) is configured; the wireless device may receive from the base station, a medium access control (MAC) control element (CE) indicating an activation of the discarding FEC PDUs; the wireless device may discard, based on the activation of the discarding FEC PDUs, one or more FEC PDUs of an application of the wireless device; the discarding FEC PDU may be FEC based handling.

[0325] In an example, a wireless device may receive from a base station, a medium access control (MAC) control element (CE) indicating an activation of discarding forward-error-correction (FEC) protocol data units (PDUs).

[0326] In an example, a wireless device may receive from a base station, a medium access control (MAC) control element (CE) indicating an activation of discarding forward-error-correction (FEC) protocol data units (PDUs); the wireless device may receive from an application of the wireless device, one or more PDUs, wherein the one or more PDUs comprises one or more FEC PDUs and one or more non-FEC PDUs.

[0327] In an example, a wireless device may receive from a base station, a medium access control (MAC) control element (CE) indicating an activation of discarding forward-error-correction (FEC) protocol data units (PDUs); the wireless device may receive from an application of the wireless device, one or more PDUs, wherein the one or more PDUs may comprise one or more FEC PDUs and one or more non-FEC PDUs; the one or more PDUs may comprise one or more PDU sets, wherein the one or more PDU sets comprises one or more first PDU sets and one or more second PDU sets.

[0328] In an example, a wireless device may receive from a base station, a medium access control (MAC) control element (CE) indicating an activation of discarding forward-error-correction (FEC) protocol data units (PDUs); the wireless device may receive from an application of the wireless device, one or more PDUs, wherein the one or more PDUs comprises one or more FEC PDUs and one or more non-FEC PDUs; the one or more PDUs may comprise one or more PDU sets, wherein the one or more PDU sets may comprise one or more first PDU sets and one or more second PDU sets; the one or more first PDU sets may be associated with a first PDU set importance and the one or more second PDU sets may be associated with a second PDU set importance

[0329] In an example, a wireless device may receive from a base station, a medium access control (MAC) control element (CE) indicating an activation of discarding forward-error-correction (FEC) protocol data units (PDUs); the wireless device may determine, among the one or more PDUs, the one or more FEC PDUs and the one or more non- FEC PDUs.

[0330] In an example, a wireless device may receive from a base station, a medium access control (MAC) control element (CE) indicating an activation of discarding forward-error-correction (FEC) protocol data units (PDUs); the wireless device may discard, and based on the activation of the discarding the FEC PDUs, the one or more FEC PDUs.

[0331] In an example, a wireless device may receive from a base station, a medium access control (MAC) control element (CE) indicating an activation of discarding forward-error-correction (FEC) protocol data units (PDUs); the wireless device may send to the base station, and based on the activation of the discarding the FEC PDUs, one or more non-FEC PDUs.

[0332] In an example, a wireless device may receive from a base station, a radio resource control (RRC) message indicating that discarding FEC PDUs is configured; the wireless device may receive from the base station, a medium access control (MAC) control element (CE) indicating an activation of discarding forward-error-correction (FEC) protocol data units (PDUs).

[0333] In an example, a wireless device may receive from a base station, a radio resource control (RRC) message indicating that discarding FEC PDUs is configured; the wireless device may receive from the base station, a medium access control (MAC) control element (CE) indicating an activation of discarding forward-error-correction (FEC) protocol data units (PDUs); the wireless device may receive the MAC CE, based on the discarding FEC PDUs is configured.

[0334] In an example, a wireless device may receive from a base station, a medium access control (MAC) control element (CE) indicating an activation of discarding forward-error-correction (FEC) protocol data units (PDUs); the wireless device may receive, a second MAC CE indicating a deactivation of the discarding FEC PDUs.

[0335] In an example, a wireless device may receive from a base station, a medium access control (MAC) control element (CE) indicating an activation of discarding forward-error-correction (FEC) protocol data units (PDUs); the wireless device may receive, a second MAC CE indicating a deactivation of the discarding FEC PDUs; the wireless device may receive one or more third FEC PDUs, and may send the one or more FEC PDUs to the base station, based on the discarding FEC PDUs being deactivated.

[0336] In an example, a wireless device may receive from a base station, a medium access control (MAC) control element (CE) indicating an activation of discarding forward-error-correction (FEC) protocol data units (PDUs); the MAC CE may comprise a ratio of the discarding the FEC PDUs for uplink.

[0337] In an example, a wireless device may receive from a base station, a medium access control (MAC) control element (CE) indicating an activation of discarding forward-error-correction (FEC) protocol data units (PDUs); the MAC CE may comprise a ratio of the discarding the FEC PDUs for uplink; the ratio may indicate how many FEC PDUs of total FEC PDUs needs to be discard.

[0338] In an example, a wireless device may receive from a base station, a medium access control (MAC) control element (CE) indicating an activation of discarding forward-error-correction (FEC) protocol data units (PDUs); the MAC CE may comprise a PSI (PDU Set Importance) for which the discarding the FEC PDUs applies.

[0339] In an example, a wireless device may receive from a base station, a radio resource control (RRC) message indicating that discarding FEC PDUs is configured; the wireless device may receive from the base station, a mediumaccess control (MAC) control element (CE) indicating an activation of discarding forward-error-correction (FEC) protocol data units (PDUs); the RRC message may indicate a radio bearer (RB) for which the discarding the FEC PDUs applies.

[0340] In an example, a wireless device may send to the base station, an access stratum capability indicator indicating that the wireless device supports discarding the FEC PDUs in the access stratum; the wireless device may receiving a radio resource control (RRC) message indicating that discarding FEC PDUs is configured;

[0341] In an example, a wireless device may receive from a base station, a medium access control (MAC) control element (CE) indicating an activation of discarding forward-error-correction (FEC) protocol data units (PDUs); the wireless device may send, a second MAC CE indicating a buffer status, wherein the buffer status excludes the one or more FEC PDUs, based on the activation of the discarding FEC PDUs.

[0342] In an example, a wireless device may receive from a base station, a radio resource control (RRC) message indicating that discarding FEC PDUs is configured; the wireless device may receive from the base station, a medium access control (MAC) control element (CE) indicating an activation of discarding forward-error-correction (FEC) protocol data units (PDUs); the RRC message may indicate a radio bearer (RB) for which the discarding the FEC PDUs applies; the RRC message may comprise at least one of a first timer value for the non-FEC PDUs and a second timer value for the FEC-PDUs.

[0343] In an example, a wireless device may receive from a base station, a radio resource control (RRC) message indicating that discarding FEC PDUs is configured; the wireless device may receive from the base station, a medium access control (MAC) control element (CE) indicating an activation of discarding forward-error-correction (FEC) protocol data units (PDUs); the RRC message may indicate a radio bearer (RB) for which the discarding the FEC PDUs applies; the RRC message may comprise at least one of a first timer value for the non-FEC PDUs and a second timer value for the FEC-PDUs; the wireless device may start a timer with the second timer value in response to receiving a FEC PDU from the application, based on the activation of the discarding of FEC PDUs.

[0344] In an example, a wireless device may receive from a base station, a radio resource control (RRC) message indicating that discarding FEC PDUs is configured; the wireless device may receive from the base station, a medium access control (MAC) control element (CE) indicating an activation of discarding forward-error-correction (FEC) protocol data units (PDUs); the RRC message may indicate a radio bearer (RB) for which the discarding the FEC PDUs applies; the RRC message may comprise at least one of a first timer value for the non-FEC PDUs and a second timer value for the FEC-PDUs; the wireless device may start a timer with the second timer value in response to receiving a FEC PDU from the application, based on the activation of the discarding of FEC PDUs; the wireless device may discard the FEC PDU at expiry of the timer.

[0345] In an example, a wireless device may receive from a basestation, a packet data convergence protocol (PDCP) protocol data unit (PDU) indicating an activation of a discarding forward-error-correction (FEC) PDUs.

[0346] In an example, a wireless device may send to a basestation, an access stratum layer capability indicator indicating support of handling of one or more forward-error-correction (FEC) PDUs.

[0347] In an example, a wireless device may send to a basestation, an access stratum layer capability indicatorindicating support of discarding one or more forward-error-correction (FEC) PDUs.

[0348] In an example, a wireless device may receive from a base station, an activation message indicating an activation of discarding forward-error-correction (FEC) protocol data units (PDUs).

[0349] In an example, a wireless device may receive from a base station, a packet data convergence protocol (PDCP) protocol data unit indicating an activation of discarding forward-error-correction (FEC) protocol data units (PDUs).

[0350] In an example, a wireless device may discard one or more forward-error-correction (FEC) protocol data units (PDUs), based on activation of FEC based discarding.

[0351] In an example, a wireless device may discard one or more forward-error-correction (FEC) protocol data units (PDUs) of a PDU set, based on activation of FEC based discarding; the wireless device may not discard one or more non-FEC PDUs of a PDU set, based on activation of FEC based discarding.

[0352] In an example, a wireless device may receive a value indicating a ratio of forward-error-correction (FEC) protocol data units (PDUs) discarding; the wireless device may discard one or more FEC PDUs of a PDU set, based on the ratio.

[0353] In an example, a wireless device may receive a value indicating a time value of forward-error-correction (FEC) protocol data units (PDUs) discarding; the wireless device may discard a FEC PDU, based on expiry of a timer with the time value.

[0354] In an example, a wireless device may send a buffer status report medium access control (MAC) control element (CE), wherein the buffer status report MAC CE may indicate a data volume of non-forward-error-correction (FEC) protocol data units (PDUs) and / or may not indicate a data volume of FEC PDUs.

Claims

CLAIMS1. A method comprising: sending, by a wireless device to a base station, a first message comprising a capability indicator indicating that the wireless device supports discarding of forward-error-correction (FEC) protocol data units (PDUs); receiving, by the wireless device from the base station, a radio resource control (RRC) message indicating that discarding FEC PDU is configured; receiving, by the wireless device from the base station, a medium access control (MAC) control element (CE) indicating an activation of the discarding FEC PDU; discarding, by the wireless device based on the activation of the discarding FEC PDU, one or more FEC PDUs associated with one or more PDU sets, of an application of the wireless device; and sending, by the wireless device to the base station, one or more non-FEC PDUs.

2. A method comprising: receiving, by a wireless device from a base station, a message indicating activation of discarding forward- error-correction (FEC) protocol data units (PDUs).

3. The method of claim 2, further comprising sending, by the wireless device to the base station, one or more non- FEC PDUs.

4. The method of one of claims 2 to 3, further comprising receiving, by the wireless device from an application of the wireless device, one or more PDUs, wherein the one or more PDUs comprises one or more FEC PDUs and one or more non-FEC PDUs.

5. The method of claim 4, wherein: the one or more PDUs belong to one or more PDU sets; and the one or more PDU sets comprise one or more first PDU sets and one or more second PDU sets.

6. The method of one claim 5, wherein: the one or more first PDU sets are associated with a first PDU set importance (PSI); and the one or more second PDU sets are associated with a second PDU set importance.

7. The method of one of claims 4 to 6, further comprising determining by the wireless device, among the one or more PDUs, the one or more FEC PDUs and the one or more non-FEC PDUs.

8. The method of one of claims 4 to 7, further comprising discarding, by the wireless device and based on the activation of the discarding the FEC PDUs, at least a FEC PDU among the one or more FEC PDUs.

9. The method of one of claims 4 to 8, wherein the non-FEC PDUs are one or more PDUs necessary at a receiver, and the FEC PDUs are PDUs which are not non-FEC PDUs or redundant PDUs.

10. The method of one of claims 2 to 9, further comprising receiving by the wireless device from the base station, a radio resource control (RRC) message indicating that discarding FEC PDUs is configured.

11. The method of claim 10, wherein the wireless device receives the message indicating activation after receiving the RRC message.

12. The method of one of claims 10 to 11 , wherein the RRC message further indicates a radio bearer (RB) for which the discarding FEC PDUs applies.

13. The method of one of claims 10 to 12, wherein the RRC message further comprises a first timer value for one or more non-FEC PDUs and a second timer value for the one or more FEC-PDUs.

14. The method of claim 13, wherein the wireless device starts a second timer with the second timer value for a FEC PDU, in response to receiving the FEC PDU from the application, based on the activation of the discarding of FEC PDUs and starts a first timer with the first timer value for a non-FEC PDU, in response to receiving the non-FEC PDU from the application, based on the activation of the discarding of FEC PDUs.

15. The method of claim 14, wherein the wireless device discards the FEC PDU at expiry of the second timer.

16. The method of one of claims 2 to 15, wherein the message comprises at least one of: a medium access control (MAC) control element (CE); or a packet data convergence protocol (PDCP) protocol data unit (PDU).

17. The method of one of claims 2 to 16, further comprising receiving by the wireless device, a second MAC CE indicating a deactivation of the discarding FEC PDUs.

18. The method of claim 17, further comprising sending, by the wireless device to the base station and based on the discarding FEC PDUs being deactivated, one or more third FEC PDUs received from the application.

19. The method of one of claims 2 to 18, wherein the message further comprises a ratio of the discarding FEC PDUs for uplink.

20. The method of claim 19, wherein the ratio, for a QoS flow, indicates at least one of: how many FEC PDUs among the one or more FEC PDUs can be discarded; how many PDUs, in a PDU set, are needed to be transmitted; how many PDUs in a PDU set can be discarded; or a maximum percentage of not delivered PDUs in a PDU set.

21. The method of one of claims 2 to 20, wherein the message further comprises a PSI indicating at least one of one or more first PDU sets or one or more second PDU sets for which the discarding FEO PDUs applies.

22. The method of one of claims 2 to 21 , further comprising sending, by the wireless device to the base station, an access stratum capability indicator indicating that the wireless device supports discarding FEO PDUs in the access stratum.

23. The method of one of claims 2 to 22, further comprising sending, by the wireless device, a third MAC CE indicating a buffer status report, wherein the buffer status report excludes the one or more FEC PDUs based on the activation of the discarding FEC PDUs.

24. A wireless device comprising one or more processors and memory storing instructions that, when executed by the one or more processors, cause the wireless device to perform the method of any of claims 1 to 23.

25. A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a wireless device, cause the wireless device to perform the method of any of claims 1 to 23.

26. A method comprising: sending, by a base station to a wireless device, a message indicating activation of discarding forward- error-correction (FEC) protocol data units (PDUs).

27. The method of claim 26, further comprising receiving, from the wireless device, one or more non-FEC PDUs.

28. The method of one of claims 26 to 27, wherein the wireless device receives one or more PDUs from an application, wherein the one or more PDUs comprises one or more FEC PDUs and one or more non-FEC PDUs.

29. The method of claim 28, wherein: the one or more PDUs belong to one or more PDU sets; and the one or more PDU sets comprise one or more first PDU sets and one or more second PDU sets.

30. The method of one claim 29, wherein: the one or more first PDU sets are associated with a first PDU set importance (PSI); and the one or more second PDU sets are associated with a second PDU set importance.

31. The method of one of claims 28 to 30, wherein the wireless device discards, among the one or more PDUs, the one or more FEC PDUs and the one or more non-FEC PDUs.

32. The method of one of claims 28 to 31 , wherein the wireless device discards, based on the activation of the discarding the FEC PDUs, at least a FEC PDU among the one or more FEC PDUs.

33. The method of one of claims 28 to 32, wherein the non-FEC PDUs are one or more PDUs necessary at a receiver, and the FEC PDUs are PDUs which are not non-FEC PDUs or redundant PDUs.

34. The method of one of claims 26 to 33, further comprising sending, to the wireless device, a radio resource control (RRC) message indicating that discarding FEC PDUs is configured.

35. The method of claim 34, wherein the wireless device receives the message indicating activation after receiving the RRC message.

36. The method of one of claims 34 to 35, wherein the RRC message further indicates a radio bearer (RB) for which the discarding FEC PDUs applies.

37. The method of one of claims 34 to 36, wherein the RRC message further comprises a first timer value for one or more non-FEC PDUs and a second timer value for the one or more FEC-PDUs.

38. The method of claim 37, wherein the wireless device starts a second timer with the second timer value for a FEC PDU, in response to receiving the FEC PDU from the application, based on the activation of the discarding of FEC PDUs and starts a first timer with the first timer value for a non-FEC PDU, in response to receiving the non-FEC PDU from the application, based on the activation of the discarding of FEC PDUs.

39. The method of claim 38, wherein the wireless device discards the FEC PDU at expiry of the second timer.

40. The method of one of claims 26 to 39, wherein the message comprises at least one of: a medium access control (MAC) control element (CE); or a packet data convergence protocol (PDCP) protocol data unit (PDU).

41. The method of one of claims 26 to 40, further comprising sending, to the wireless device, a second MAC CE indicating a deactivation of the discarding FEC PDUs.

42. The method of claim 41 , further comprising receiving, from the wireless device and based on the discarding FEC PDUs being deactivated, one or more third FEC PDUs received from the application.

43. The method of one of claims 26 to 42, wherein the message further comprises a ratio of the discarding FEC PDUs for uplink.

44. The method of claim 43, wherein the ratio, for a QoS flow, indicates at least one of: how many FEC PDUs among the one or more FEC PDUs can be discarded; how many PDUs, in a PDU set, are needed to be transmitted; how many PDUs in a PDU set can be discarded; or a maximum percentage of not delivered PDUs in a PDU set.

45. The method of one of claims 26 to 44, wherein the message further comprises a PSI indicating at least one of one or more first PDU sets or one or more second PDU sets for which the discarding FEC PDUs applies.

46. The method of one of claims 26 to 45, further comprising receiving, from the wireless device, an access stratum capability indicator indicating that the wireless device supports discarding FEC PDUs in the access stratum.

47. The method of one of claims 26 to 46, further comprising receiving, from the wireless device, a third MAC CE indicating a buffer status report, wherein the buffer status report excludes the one or more FEC PDUs based on the activation of the discarding FEC PDUs.

48. A base station comprising one or more processors and memory storing instructions that, when executed by the one or more processors, cause the base station to perform the method of any of claims 26 to 47.

49. A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a base station, cause the base station to perform the method of any of claims 26 to 47.

50. A system comprising: a base station comprising: one or more processors and memory storing instructions that, when executed by the one or more processors, cause the base station to: send, to a wireless device, a message indicating activation of discarding forward-error-correction (FEC) protocol data units (PDUs); and the wireless device, wherein the wireless device comprises: one or more processors and memory storing instructions that, when executed by the one or more processors, cause the wireless device to: receive, from the base station, the message indicating activation of discarding FEC PDUs.

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