Monitoring message4
Patent Information
- Application Number
- PCT/CN2025/086010
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-10-01
Smart Images

Figure CN2025086010_01102026_PF_FP_ABST
Abstract
Description
MONITORING MESSAGE4FIELD
[0001] Embodiments of the present disclosure relate to the field of telecommunication and in particular to methods, apparatuses and computer readable storage media for deriving a RNTI for monitoring message 4 (Msg4) .BACKGROUND
[0002] In the 3GPP (3rd Generation Partnership Project) cellular network, a synchronization signal is a crucial element for maintaining the timing and frequency alignment between the base station (eNodeB) and the user equipment (UE) . This signal enables the UE to accurately receive and decode data transmitted by the eNodeB.
[0003] The non-terrestrial network (NTN) is a relatively new concept within the 3GPP that aims to extend cellular connectivity beyond traditional terrestrial networks. This means providing cellular service to areas not covered by ground-based cell towers, such as: 1) Remote areas (e.g., vast deserts, remote islands, or mountainous regions where building traditional cell towers is impractical or expensive) , 2) Moving vehicles (e.g., ships, airplanes, and even vehicles in space, enabling continuous connectivity while in motion) and 3) Disaster relief (e.g., NTNs can provide vital communication during natural disasters or emergencies where terrestrial infrastructure might be damaged. ) , etc.SUMMARY
[0004] The scope of protection sought for various example embodiments is set out by the claims. According to some aspects, there is provided the subject matter of the independent claims. Some further aspects are defined in the dependent claims. The example embodiments and features, if any, described in this specification that do not fall under the scope of the claims are to be interpreted as examples useful for understanding various embodiments.
[0005] In an aspect of the present disclosure, there is provided an apparatus (e.g., user device) . The apparatus comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform: receiving first configuration information related to a contention based message 3, Msg3, transmission window and second configuration information related to a message 4, Msg4, monitoring window; transmitting a Msg3 in a transmission window according to the first configuration information; determining one or more radio network temporary identifiers, RNTIs, based on at least one of the first configuration information or the second configuration information; monitoring scheduling information of a Msg4 by using the determined one or more RNTIs; and receiving the Msg4 based on the monitored scheduling information.
[0006] Other features and advantages of the embodiments of the present disclosure will also be apparent from the following description of specific embodiments when read in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of embodiments of the disclosure.BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Embodiments of the disclosure are presented in the sense of examples and their advantages are explained in greater detail below, with reference to the accompanying drawings.
[0008] FIG. 1 illustrates an example of a wireless communication network;
[0009] FIG. 2 is a schematic diagram illustrating a non-terrestrial network in which example embodiments of the present disclosure may be implemented.
[0010] FIG. 3 illustrates an example of a Msg3 transmission window and a Msg4 monitoring window.
[0011] FIG. 4 is a schematic flow diagram illustrating some example embodiments according to an aspect of the disclosure.
[0012] FIG. 5 is a schematic flow diagram illustrating some example embodiments according to other aspect of the disclosure.
[0013] FIG. 6 illustrates an example of an apparatus.
[0014] FIG. 7 illustrates an example of an apparatus.
[0015] Throughout the drawings, the same or similar reference numerals may represent the same or similar element.DETAILED DESCRIPTION
[0016] The following embodiments are exemplifying. Principle of the present disclosure will now be described with reference to some example embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitation as to the scope of the disclosure. Embodiments described herein may be implemented in various manners other than the ones described below.
[0017] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein may have the same meaning as commonly understood by one of ordinary skills in the art to which this disclosure belongs.
[0018] References in the present disclosure to “one embodiment, ” “an embodiment, ” “an example embodiment, ” and the like indicate that the embodiment described may include a particular feature, structure, element or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, element or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, element or characteristic in connection with other embodiments whether or not explicitly described.
[0019] It shall be understood that although the terms “first, ” “second” and the like may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments. As used herein, the term “and / or” includes any and all combinations of one or more of the listed terms.
[0020] As used herein, “at least one of the following: <a list of two or more elements>” and “at least one of <a list of two or more elements>” and similar wording, where the list of two or more elements are joined by “and” or “or” , mean at least any one of the elements, or at least any two or more of the elements, or at least all the elements.
[0021] As used herein, unless stated explicitly, performing a step “in response to A” does not indicate that the step is performed immediately after “A” occurs and one or more intervening steps may be included.
[0022] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a” , “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” , “comprising” , “has” , “having” , “includes” and / or “including” , when used herein, specify the presence of stated features, elements, and / or components etc., but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof.
[0023] As used in this application, the term “circuitry” may refer to one or more or all of the following: (a) hardware-only circuit implementations (such as implementations in only analog and / or digital circuitry) and (b) combinations of hardware circuits and software, such as (as applicable) : (i) a combination of analog and / or digital hardware circuit (s) with software / firmware and (ii) any portions of hardware processor (s) with software (including digital signal processor (s) ) , software, and memory (ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and (c) hardware circuit (s) and or processor (s) , such as a microprocessor (s) or a portion of a microprocessor (s) , that requires software (e.g., firmware) for operation, but the software may not be present when it is not needed for operation.
[0024] This definition of circuitry applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and / or firmware. The term circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.
[0025] As used herein, the term “communication network” refers to a network following any suitable communication standards, such as New Radio (NR) , Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , Narrow Band Internet of Things (NB-IoT) and so on. Furthermore, the communications between a terminal device and a network device in the communication network may be performed according to any suitable generation communication protocols, including, but not limited to the fourth generation (4G) , 4.5G, the fifth generation (5G) , the sixth generation (6G) communication protocols, and / or any other protocols either currently known or to be developed in the future. Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will of course also be future type communication technologies and systems with which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the aforementioned system.
[0026] As used herein, the term “network device” refers to a node in a communication network via which a user device accesses the network and receives services therefrom. The network device may refer to a network entity, a base station (BS) or an access point (AP) , for example, a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , an NR NB (also referred to as a gNB) , a radio access network (RAN) node, a new generation RAN (NG-RAN) node, a Remote Radio Unit (RRU) , a radio header (RH) , a remote radio head (RRH) , a relay, an Integrated Access and Backhaul (IAB) node, a low power node such as a femto, a pico, a non-terrestrial network (NTN) device or non-ground network device such as a satellite network device, a low earth orbit (LEO) satellite and a geosynchronous earth orbit (GEO) satellite, an aircraft network device, and so forth, depending on the applied terminology and technology. In some example embodiments, radio access network (RAN) split architecture includes a Centralized Unit (CU) and a Distributed Unit (DU) at an IAB donor node. An IAB node includes a Mobile Terminal (IAB-MT) part that behaves like a UE toward the parent node, and a DU part of an IAB node behaves like a base station toward the next-hop IAB node.
[0027] The term “user device” refers to any end device that may be capable of wireless communication. By way of example rather than limitation, a terminal device may also be referred to as a communication device, user equipment (UE) , a Subscriber Station (SS) , a Portable Subscriber Station, a Mobile Station (MS) , a terminal device or an Access Terminal (AT) . The user device may include, but not limited to, a mobile phone, a cellular phone, a smart phone, voice over IP (VoIP) phones, wireless local loop phones, a tablet, a wearable terminal device, a personal digital assistant (PDA) , portable computers, desktop computer, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , USB dongles, smart devices, wireless customer-premises equipment (CPE) , an Internet of Things (loT) device, a watch or other wearable, a head-mounted display (HMD) , a vehicle, a drone, a medical device and applications (e.g., remote surgery) , an industrial device and applications (e.g., a robot and / or other wireless devices operating in an industrial and / or an automated processing chain contexts) , a consumer electronics device, a device operating on commercial and / or industrial wireless networks, and the like. The user device may also correspond to a Mobile Termination (MT) part of an IAB node (e.g., a relay node) . In the following description, the terms “user device” , “communication device” , “terminal” , “terminal device” , “user equipment” and “UE” may be used interchangeably.
[0028] As used herein, the term “resource, ” “transmission resource, ” “resource block, ” “physical resource block” (PRB) , “uplink resource, ” “downlink resource” or “sidelink resource” may refer to any resource for performing a communication, for example, a communication between a user device and a network device, such as a resource in time domain, a resource in frequency domain, a resource in space domain, a resource in code domain, or any other resource enabling a communication, and the like. In the following, unless explicitly stated, a resource in both frequency domain and time domain will be used as an example of a transmission resource for describing some example embodiments of the present disclosure. It is noted that example embodiments of the present disclosure are equally applicable to other resources in other domains.
[0029] The term “configuration” used in this embodiment may indicate that control information transmission between the network device and the user device for setting up communication channels and / or parameters. For example, transmitting / receiving the configuration means a RRC configuration message, DCI, UCI, or some other control information is transmitted / received between the network device and the user device.
[0030] FIG. 1 depicts an example of a simplified wireless communication network showing some physical and logical network entities. The connections shown in FIG. 1 may be physical connections or logical connections. It is apparent to a person skilled in the art that the wireless communication network may also comprise other physical and logical entities than those shown in FIG. 1.
[0031] The example embodiments described herein are not, however, restricted to the wireless communication network given as an example but a person skilled in the art may apply the embodiments described herein to other wireless communication networks provided with necessary properties.
[0032] The example wireless communication network shown in FIG. 1 includes an access network 104, such as a radio access network (RAN) , and a core network 110.
[0033] FIG. 1 shows user equipment (UE) 100, 102 configured to be in a wireless connection on one or more communication channels in a radio cell with an access node (AN) 104 of an access network. The AN 104 may be a network device, such as an evolved NodeB (abbreviated as eNB or eNodeB) , a next generation evolved NodeB (abbreviated as ng-eNB) , or a next generation NodeB (abbreviated as gNB or gNodeB) , providing the radio cell. The wireless connection (e.g., radio link) from a UE to the AN 104 may be called uplink (UL) or reverse link, and the wireless connection (e.g., radio link) from the AN to the UE may be called downlink (DL) or forward link. UE 100 may also communicate directly with UE 102, and vice versa, via a wireless connection generally referred to as a sidelink (SL) . It should be appreciated that the access node 104 or its functionalities may be implemented by using any node, host, server or access point etc. entity suitable for providing such functionalities.
[0034] The access network may comprise more than one access node, in which case the access nodes may also be configured to communicate with one another over links, wired or wireless. These links between access nodes may be used for sending and receiving control plane signaling and also for routing data from one access node to another access node.
[0035] The access node may comprise a computing device configured to control the radio resources of the access node. The access node may also be referred to as a network entity, a base station, a base transceiver station (BTS) , an access point, a cell site, a radio access node or any other type of node capable of being in a wireless connection with a UE (e.g., UEs 100, 102) . The access node may include or be coupled to transceivers. From the transceivers of the access node, a connection may be provided to an antenna unit that establishes bi-directional radio links to UEs 100, 102. The antenna unit may comprise an antenna or antenna element, or a plurality of antennas or antenna elements.
[0036] The access node 104 may further be connected to a core network (CN) 110. The core network 110 may comprise an evolved packet core (EPC) network and / or a 5th generation core network (5GC) . The EPC may comprise network entities, such as a serving gateway (S-GW for routing and forwarding data packets) , a packet data network gateway (P-GW) for providing connectivity of UEs to external packet data networks, and a mobility management entity (MME) . The 5GC may comprise network functions, such as a user plane function (UPF) , an access and mobility management function (AMF) , and a location management function (LMF) .
[0037] The core network 110 may also be able to communicate with one or more external networks 113, such as a public switched telephone network or the Internet, or utilize services provided by them. For example, in 5G wireless communication networks, the UPF of the core network 110 may be configured to communicate with an external data network via an N6 interface. In LTE wireless communication networks, the P-GW of the core network 110 may be configured to communicate with an external data network.
[0038] The illustrated UE 100, 102 is one type of an apparatus to which resources on the air interface may be allocated and assigned. The UE 100, 102 may also be called a wireless communication device, a subscriber unit, a mobile station, a remote terminal, an access terminal, a user terminal, a terminal device, or a user device just to mention but a few names. The UE may be a computing device operating with or without a subscriber identification module (SIM) , including, but not limited to, the following types of computing devices: a mobile phone, a smartphone, a personal digital assistant (PDA) , a handset, a computing device comprising a wireless modem (e.g., an alarm or measurement device, etc. ) , a laptop computer, a desktop computer, a tablet, a game console, a notebook, a multimedia device, a reduced capability (RedCap) device, a wearable device (e.g., a watch, earphones or eyeglasses) with radio parts, a sensor comprising a wireless modem, or any computing device comprising a wireless modem integrated in a vehicle.
[0039] It should be appreciated that a UE may also be a nearly exclusive uplink-only device, of which an example may be a camera or video camera loading images or video clips to a network. A UE may also be a device having capability to operate in an Internet of Things (IoT) network, which is a scenario in which objects may be provided with the ability to transfer data over a network without requiring human-to-human or human-to-computer interaction. The UE may also utilize cloud. In some applications, the computation may be carried out in the cloud or in another UE.
[0040] The wireless communication network may also be able to support the usage of cloud services, for example at least part of core network operations may be carried out as a cloud service (this is depicted in FIG. 1A by “cloud” 114) . The wireless communication network may also comprise a central control entity, or the like, providing facilities for wireless communication networks of different operators to cooperate for example in spectrum sharing.
[0041] 5G enables using multiple input –multiple output (MIMO) antennas in the access node 104 and / or the UE 100, 102, many more base stations or access nodes than an LTE network (aso-called small cell concept) , including macro sites operating in co-operation with smaller stations and employing a variety of radio technologies depending on service needs, use cases and / or spectrum available. 5G wireless communication networks may support a wide range of use cases and related applications including video streaming, augmented reality, different ways of data sharing and various forms of machine type applications, such as (massive) machine-type communications (mMTC) , including vehicular safety, different sensors and real-time control.
[0042] In 5G wireless communication networks, access nodes and / or UEs may have multiple radio interfaces, namely below 6GHz, cmWave and mmWave, and also being integrable with existing legacy radio access technologies, such as the LTE. Integration with the LTE may be implemented, for example, as a system, where macro coverage may be provided by the LTE, and 5G radio interface access may come from small cells by aggregation to the LTE. In other words, a 5G wireless communication network may support both inter-RAT operability (such as LTE-5G) and inter-RI operability (inter-radio interface operability, such as below 6GHz –cmWave –mmWave) . One of the concepts considered to be used in 5G wireless communication networks may be network slicing, in which multiple independent and dedicated virtual sub-networks (network instances) may be created within the substantially same infrastructure to run services that have different requirements on latency, reliability, throughput and mobility.
[0043] In some example embodiments, an access node (e.g., access node 104) may comprise: a radio unit (RU) comprising a radio transceiver (TRX) , i.e., a transmitter (Tx) and a receiver (Rx) ; one or more distributed units (DUs) 105 that may be used for the so-called Layer 1 (L1) processing and real-time Layer 2 (L2) processing; and a central unit (CU) 108 (also known as a centralized unit) that may be used for non-real-time L2 and Layer 3 (L3) processing. The CU 108 may be connected to the one or more DUs 105 for example via an F1 interface. Such an embodiment of the access node may enable the centralization of CUs relative to the cell sites and DUs, whereas DUs may be more distributed and may even remain at cell sites. The CU and DU together may also be referred to as baseband or a baseband unit (BBU) . The CU and DU may also be comprised in a radio access point (RAP) .
[0044] The CU 108 may be a logical node hosting radio resource control (RRC) , service data adaptation protocol (SDAP) and / or packet data convergence protocol (PDCP) , of the NR protocol stack for an access node. The DU 105 may be a logical node hosting radio link control (RLC) , medium access control (MAC) and / or physical (PHY) layers of the NR protocol stack for the access node. The operations of the DU may be at least partly controlled by the CU. It should also be understood that the distribution of functions between DU 105 and CU 108 may vary depending on implementation. The CU may comprise a control plane (CU-CP) , which may be a logical node hosting the RRC and the control plane part of the PDCP protocol of the NR protocol stack for the access node. The CU may further comprise a user plane (CU-UP) , which may be a logical node hosting the user plane part of the PDCP protocol and the SDAP protocol of the CU for the access node.
[0045] Cloud computing systems may also be used to provide the CU 108 and / or DU 105. A CU provided by a cloud computing system may be referred to as a virtualized CU (vCU) . In addition to the vCU, there may also be a virtualized DU (vDU) provided by a cloud computing system. Furthermore, there may also be a combination, where the DU may be implemented on so-called bare metal solutions, for example application-specific integrated circuit (ASIC) or customer-specific standard product (CSSP) system-on-a-chip (SoC) .
[0046] Edge cloud may be brought into the access network (e.g., RAN) by utilizing network function virtualization (NFV) and software defined networking (SDN) . Using edge cloud may mean access node operations to be carried out, at least partly, in a computing system operationally coupled to a remote radio head (RRH) or a radio unit (RU) of an access node. It is also possible that access node operations may be performed on a distributed computing system or a cloud computing system located at the access node. Application of cloud RAN architecture enables RAN real-time functions being carried out at the access network (e.g., in a DU 105) and non-real-time functions being carried out in a centralized manner (e.g., in a CU 108) .
[0047] It should also be understood that the distribution of functions between core network operations and access node operations may differ in future wireless communication networks compared to that of the LTE or 5G, 6G, or even be non-existent. Some other technology advancements that may be used include big data and all-IP, which may change the way wireless communication networks are being constructed and managed. 5G (or new radio, NR) wireless communication networks may support multiple hierarchies, where multi-access edge computing (MEC) servers may be placed between the core network 110 and the access node 104. It should be appreciated that MEC may be applied in LTE wireless communication networks as well.
[0048] A 5G wireless communication network ( “5G network” ) may also comprise a non-terrestrial communication network, such as a satellite communication network, to enhance or complement the coverage of the 5G radio access network. For example, satellite communication may support the transfer of data between the 5G radio access network and the core network, enabling more extensive network coverage. Possible use cases may be providing service continuity for machine-to-machine (M2M) or Internet of Things (IoT) devices or for passengers on board of vehicles, or ensuring service availability for critical communications, and future railway / maritime / aeronautical communications. Satellite communication may utilize geostationary earth orbit (GEO) satellite systems, but also low earth orbit (LEO) satellite systems, in particular mega-constellations (systems in which hundreds of (nano) satellites are deployed) . A given satellite 106 in the mega-constellation may cover several satellite-enabled network entities that create on-ground cells. The on-ground cells may be created through an on-ground relay access node or by an access node 104 located on-ground or in a satellite.
[0049] It is obvious for a person skilled in the art that the access node 104 depicted in FIG. 1A is just an example of a part of an access network (e.g., a radio access network) and in practice, the access network may comprise a plurality of access nodes, the UEs 100, 102 may have access to a plurality of radio cells, and the access network may also comprise other apparatuses, such as physical layer relay access nodes or other entities. At least one of the access nodes may be a Home eNodeB or a Home gNodeB. A Home gNodeB or a Home eNodeB is a type of access node that may be used to provide indoor coverage inside a home, office, or other indoor environment.
[0050] Additionally, in a geographical area of an access network (e.g., a radio access network) , a plurality of different kinds of radio cells as well as a plurality of radio cells may be provided. Radio cells may be macro cells (or umbrella cells) which may be large cells having a diameter of up to tens of kilometers, or smaller cells such as micro-, femto-or picocells. The access node (s) of FIG. 1A may provide any kind of these cells. A cellular radio network may be implemented as a multilayer access networks including several kinds of radio cells. In multilayer access networks, one access node may provide one kind of a radio cell or radio cells, and thus a plurality of access nodes may be needed to provide such a multilayer access network.
[0051] For fulfilling the need for improving performance of access networks, the concept of “plug-and-play” access nodes may be introduced. An access network which may be able to use “plug-and-play” access nodes, may include, in addition to Home eNodeBs or Home gNodeBs, a Home Node B gateway, or HNB-GW (not shown in FIG. 1A) . An HNB-GW, which may be installed within an operator’s access network, may aggregate traffic from a large number of Home eNodeBs or Home gNodeBs back to a core network of the operator.
[0052] 1. Non-terrestrial network (NTN)
[0053] Non-terrestrial communication can be in a complementary manner to terrestrial deployments where satellite connectivity can provide coverage beyond terrestrial deployments. The 3GPP has defined the NR non-terrestrial networks (NTN) in Rel-17 and NTN enhancement Rel-18, respectively. In addition, IoT-NTN has been specified in the 3GPP Rel-17 supporting eMTC (enhanced machine-type communication) and NB-IoT (narrowband IoT) over NTN network and further been optimized in Rel-18.
[0054] FIG. 2 is a schematic diagram illustrating a non-terrestrial network in which example embodiments of the present disclosure may be implemented.
[0055] Referring to Fig. 2, the non-terrestrial network (NTN) , which may form a part of a cellular communication network, may include one or more user devices 100, 102 (shown in FIG. 1 and 2 as the UE) and one or more satellites 106 (shown in FIG. 1 and 2 as the gNB) .
[0056] The satellite 106 may be implemented as a so called regenerative satellite. The regenerative satellite may communicate with the UE 100 via a service link and communicate with a gateway on the ground (not shown) via a feeder link. The payload of the regenerative satellite may include a base station or at least a part of a base station to perform at least a part of functionalities of the base station. For example, if the satellite 106 includes a 5G NR base station named gNB onboard as shown in FIG. 2, the NR-Uu radio interface may be implemented on the service link, and the N2 / N3 interface may be implemented on the feeder link. The regenerative satellite 106 may implement regeneration of signals received from the UE 100 and the gateway on the ground. It is envisioned that the satellite 106 may also be implemented as at least a part of a 4G LTE base station eNB, 5G base station and / or a beyond 5G (e.g., 6G) base station.
[0057] The NTN are wireless communication systems that operate above the Earth’s surface, involving satellites at low Earth orbit (LEO) , medium Earth orbit (MEO) and geostationary orbit (GEO) , high-altitude platforms (HAPS) and drones. Such components are essential to realizing seamless coverage, bringing coverage even to remote areas that do not have access to traditional terrestrial networks. When the satellite 106 is a LEO satellite, it can be replaced by e.g. an airplane, a balloon, a high altitude platform station, an unmanned aircraft system and / or the like.
[0058] Devices may be separated into those connected to the 3GPP terrestrial network and those connected to satellite. In other words, user devices that require satellite connection need another device alongside their existing smartphone. With the NTN, all mobile devices will be connected to both terrestrial and satellite networks as part of the 3GPP ecosystem. And as the technology continuously evolves, the satellites will become the base stations. The NTN has two aspects such as NTN-IoT and NTN-RN.
[0059] The NTN market has started establishing itself with NTN-IoT. NTN-IoT expands the reach of IoT use cases, enabling true global coverage over land, sea and air. It may operate at both GEO and LEO altitudes, but current services mostly operate at GEO.
[0060] With the growth of NTN technology, NTN-NR will become increasingly relevant. NTN-NR will directly link smartphones and other 5G devices such as devices using RedCap for non-terrestrial services. It may operate at the LEO altitude and enable low data services, voice and messaging for various use cases.
[0061] The embodiments and / or the examples of the disclosures may operate in the NTN.
[0062] 2. Random access procedure
[0063] Hereinafter the random access procedure of the terrestrial network is explained briefly. The random access procedure described in embodiments is initiated by a PDCCH order, by a medium access control (MAC) entity itself, or by RRC for the events in accordance with TS 38.300. There may be only one Random Access procedure ongoing at any point in time in a MAC entity. The random access procedure may be performed for the uplink synchronization between the user device and the network device.
[0064] When a random access procedure is initiated, the user device may select a set of random access resources and initialize the necessary parameters for the random access procedure according to the values configured by RRC for the selected set of Random Access resources.
[0065] The contention based (CB) random access procedure may comprise four steps such as 1) preamble transmission, 2) random access response (RAR) reception, 3) message 3 (Mag3) transmission, and 4) message 4 (Msg4) reception.
[0066] At the first step of preamble transmission, the user device selects a random access preamble from a set of predefined preambles. These preambles may be of roughly two categories, such as a short preamble format and a long preamble Format. The user device also selects a random sequence number for the preamble. After choosing the preamble and sequence number, the user device transmits the preamble on a physical random access channel (PRACH) . The RACH preamble may be called message 1 (Msg1) .
[0067] At the second step, the gNB (e.g., base station of 5G) sends the RAR message called message 2 (Msg2) upon receiving Msg1 (RACH preamble) . The Msg2 may comprise several critical pieces of information, such as a time advance (TA) command for timing adjustment, a random access preamble identifier (RAPID) matching the preamble sent by the user device, and an initial uplink grant for the user device. The network device (gNB) also assigns a temporary identifier called a random access radio network temporary identifier (RA-RNTI) to the user device. The Msg2 comprises an initial uplink grant for scheduling uplink resources.
[0068] At the third step, the user device transmits the Msg3 on a physical uplink shared channel (PUSCH) . The Msg3 may be the PUSCH which carries a certain RRC message (e. g, RRCRequest) or just be pure PHY data.
[0069] At the fourth step, the gNB sends the Msg4 to the UE after processing the received Msg3. The Msg4 is a MAC data which is for Contention Resolution. The Contention Resolution message contains the user device identity, confirming that the gNB has correctly identified the user device, and contention has been resolved. At this step, network device may provide the user device with a cell radio network temporary identifier (C-RNTI) or the temporary RNTI may be promoted to the C-RNTI.
[0070] When applying to the NTN system, the the contention based Msg3 transmission may be performed without performing Msg1 and Msg2 of random access procedure. For example, the present disclosure provides embodiments of capacity enhancements for uplink where the Msg3 is transmitted without Msg1 and Mag2, and Msg4 is received in efficient manner by multiplexing Msg4 of multiple UEs into one Msg4 transmission and defining how to derive one or more RNTIs for monitoring the Msg4.
[0071] 3. RNTI determination for Msg4 monitoring
[0072] For CB-Msg3 transmission in the diversity slotted ALOHA (DSA) , the concept of Msg3 transmission window is introduced. If Msg3 is transmitted using DSA, the UE shall select the next transmission window and then randomly select K resources inside the transmission window for K replica transmissions of CB-Msg3 (K is an integer value equal to or greater than 1) .
[0073] FIG. 3 illustrates an example of a Msg3 transmission window and a Msg4 monitoring window.
[0074] Referring to FIG. 3, transmission window group comprises Msg3 transmission windows #0 to #i-1 (i=integer value greater than 1) . The Msg3 may be transmitted in the next transmission window. The replicas of the Msg3 may be transmitted within the transmission window. For example, if Msg3 arrives in the UE’s buffer before the transmission window #1, the transmission window #1 will be selected by the UE to transmit the Msg3 and all the replicas of Msg3 are transmitted within the Msg3 transmission window #1. The Msg3 transmission windows are allocated with the transmission window periodicity.
[0075] The parameters defining the Msg3 transmission window may comprises parameters indicating at least one of a number of replicas of the Msg3, a start system frame number (SFN) of the Msg3 transmission window, a size of the transmission window, a transmission window periodicity, a number of sub-windows within one Msg3 transmission window, or a sub-window size in term of at least one of time domain and frequency domain resource. The parameters may be configured to the user device (i.e., UE) via a contention based Msg3 transmission related configuration (e.g., CB-Msg3-ConfigSIB, it may also be called as first configuration information related to a contention based Msg3 transmission window) . The term “size” may represent the duration or length of the transmission window (or monitoring window) .
[0076] The transmission window group may be also configured in the Msg3 transmission related configuration. Or the transmission window group may be implicitly indicated using other Msg3 transmission related configuration and / or Msg4 monitoring related configuration. For instance, the transmission window group may include the Msg3 transmission windows that the corresponding Msg4 monitoring windows are overlapping. Herein the Msg4 monitoring windows may be configured to start 1) at the end of the Msg3 transmission window or 2) at any point within the Msg3 transmission window and after Msg3 or at least one Msg3 replica is transmitted. Besides, the Msg4 monitoring window is configured with the window size during which the UE monitors the Msg4. For instance, if the Msg3 transmission window #1 is selected to transmit Msg3 #1, the Msg4 expected in response to Msg3 #1 should be monitored during Msg4 monitoring window #1. In this case, the Msg4 monitoring window #1 of FIG. 3 starts at the end of the Msg3 transmission window #1 and lasted according to Msg4 monitoring window size.
[0077] According to the present disclosure, a single RNTI or multiple RNTIs may be defined corresponding to the different Msg3 replicas within a Msg3 transmission window.
[0078] The one or more RNTIs for Msg4 monitoring may be derived based on a CB-Msg3 resource or transmission window. The embodiments of an aspect of the present disclosure provide methods how to derive the one or more RNTI for efficient Msg4 monitoring from selected CB-Msg3 resources or transmission window.
[0079] On one hand, more multiplexing gain of Msg4 transmission can be achieved with less number of RNTIs for monitoring Msg4 by different UEs. On the other hand, the small number of RNTIs reused by multiple UEs for monitoring Msg4 leads to more overhead for the UE to get the relevant CB-Msg4 as the UE cannot filter the relevant Msg4 based on RNTI, but need to receive and decode each Msg4 and then know whether Msg4 contains its own contention resolution identifier (CR ID) or not.
[0080] FIG. 4 is a schematic flow diagram illustrating some example embodiments according to an aspect of the disclosure.
[0081] Referring to FIG. 4, the user device 100 and the network device 106 are disclosed. The user device 100 may be UE 100 of FIGs. 1 to 2. There may be more than one user device in the cell (not shown) . The network device 106 is the satellite 106 of FIGs. 1 or 2 supporting the NTN (see, FIG. 2) . That is to say, the embodiment is appliable to the situation explained in FIG. 2.
[0082] According to one embodiment of the disclosure, the apparatus may comprise at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to perform at least one of the following methods A1 to A6.
[0083] According to other embodiment of the disclosure, the apparatus 100 may comprise one or more means to perform at least one of the following methods A1 to A6.
[0084] The apparatus may be or be comprised in a user device 100 supporting the NTN. Hereinafter the apparatus is called as the user device 100 for efficient explanation of the embodiments.
[0085] Referring to FIG. 4, method A1 comprises steps S410, S420, S430a, S440, and S450 which are performed by the user device 100.
[0086] At step S410, the user device 100 receives first configuration information related to a contention based message 3 (Msg3) transmission window (e.g. CB-Msg3-ConfigSIB) and second configuration information related to a message 4 (Msg4) monitoring window (e.g., Msg4-Config) , from the network device 106.
[0087] At step S420, the user device 100 transmits a Msg3 to the network device 106 in a transmission window according to the first configuration information.
[0088] At step S430a, the user device 100 determines one or more radio network temporary identifiers (RNTIs) based on at least one of the first configuration information or the second configuration information.
[0089] A step S440, the user device 100 monitors scheduling information for a Msg4 by using the determined one or more RNTIs. The scheduling information indicates a radio resource (s) where the Msg4 to be received.
[0090] At step S450, the user device 100 receives the Msg4 based on the monitored scheduling information.
[0091] As method A2, the first configuration information of the method A1 may indicate at least one of: -a number of replicas of the Msg3; -a start system frame number, SFN, of the Msg3 transmission window; -a size of the Msg3 transmission window; -a transmission window periodicity; -a number of consecutive Msg3 transmission windows in a transmission window group; -a number of sub-windows within one Msg3 transmission window; or -a sub-window size in term of at least one of time domain and frequency domain resource.
[0092] As a method A3, the second configuration information of the method A1 or A2 may indicate at least one of: -a monitoring window size of the Msg4; -a number of the one or more RNTIs corresponding to a Msg3 transmission window; -a number of consecutive Msg3 transmission windows in a transmission window group; -an offset value of a starting RNTI; or -a scaling factor.
[0093] The offset value of the starting RNTI may be used to steer one or more RNTIs to a certain RNTI range. The scaling factor may be used to derive the one or more RNTIs from time domain resource index, e.g., the start SFN index of the DSA transmission window (e.g., the Msg3 transmission window of FIG. 3) .
[0094] As a method A4, the one or more RNTIs of the method A3 may be determined further based on at least one of the size of transmission window, the transmission window periodicity, the number of sub-windows, the monitoring window size, or an identifier of a carrier. The identifier may indicate a carrier where the Msg3 / Msg4 is transmitted / received. The one or more RNTIs may correspond to a Msg3 transmission window.
[0095] As a method A5, any one of the methods A1 to A4 may further comprises at least one step of: - obtaining a maximum number of the one or more RNTIs; or - determining a total number of the one or more RNTIs based on the transmission window size and the monitoring window size.
[0096] As a method A6, any one of the methods A1 to A4 may further comprises a step of determining a total number of the one or more RNTIs based on the transmission window size and scaling factor.
[0097] According to other embodiment of the disclosure, an apparatus 106 may comprise at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to perform at least one of the following methods A7 to A11.
[0098] According to other embodiment of the disclosure, the apparatus 106 may comprise one or more means to perform at least one of the following methods A7 to A11.
[0099] The apparatus may be or be comprised in a network device 106 supporting the NTN. Hereinafter the apparatus is called briefly as the network device 106 for efficient explanation of the embodiments.
[0100] Referring to FIG. 4, method A7 comprises steps S410, S420, S430b, S440 and S450.
[0101] At step S410, the network device 106 transmits first configuration information related to a contention based message 3 (Msg3) transmission window (e.g. CB-Msg3-ConfigSIB IE) and second configuration information related to a message 4 (Msg4) monitoring window (e.g., Msg4 Config IE) .
[0102] At step S420, the network device 106 receives a Msg3 in a transmission window based on the first configuration information.
[0103] At step S430b, the network device 106 determines one or more radio network temporary identifiers (RNTIs) based on at least one of the received Msg3 or the second configuration information.
[0104] At step S440, the network device 106 transmits scheduling information of a Msg4 by using the determined one or more RNTIs.
[0105] At step S450, the network device 106 transmits the Msg4 based on the scheduling information.
[0106] As a method A8, the method A7 may further comprise at least one step of: configuring the one or more RNTIs per a Msg3 transmission window or a number of consecutive Msg3 transmission windows in a transmission window group; and determining, the first configuration information and the second configuration information.
[0107] As a method A9, the first configuration information of the method A7 or A8 may indicate at least one of: - a number of replicas of the Msg3; - a start system frame number, SFN, of the Msg3 transmission window; - a size of the Msg3 transmission window; - a transmission window periodicity; - a number of consecutive Msg3 transmission windows in a transmission window group; - a number of sub-windows within one Msg3 transmission window; or - a sub-window size in term of at least one of time domain and frequency domain resource.
[0108] As a method A10, the second configuration information of any one of the methods A7 to A9 may indicate at least one of: -a monitoring window size of the Msg4; -a number of the one or more RNTIs corresponding to a Msg3 transmission window; -a number of consecutive Msg3 transmission windows in a transmission window group; -an offset value of a starting RNTI; or -a scaling factor.
[0109] The offset value of the starting RNTI may be used to steer one or more RNTIs to a certain RNTI range. The scaling factor may be used to derive the one or more RNTIs from time domain resource index, e.g., the start SFN index of the DSA transmission window (e.g., the Msg3 transmission window of FIG. 3) .
[0110] As a method A11, the one or more RNTIs of the method A10 may be determined further based on at least one of the size of transmission window, the transmission window periodicity, the number of sub-windows, the monitoring window size, or an identifier of a carrier. The identifier may indicate a carrier where the Msg3 / Msg4 is transmitted / received. The one or more RNTIs may correspond to a Msg3 transmission window.
[0111] In order to implement the present disclosure, a computer program comprising instructions, which when executed by the user device 100 or the network device 106 may cause the user device 100 or the network device 106 to perform the method of any one of A1 to A11. In this case, a computer readable storage medium may have stored thereon the computer program. The computer readable storage medium may be a non-transitory computer readable medium.
[0112] Alternatively, the first configuration information may further comprise a reference RNTI or a base RNTI which the user device uses to calculate the one or more RNTIs.
[0113] FIG. 5 is a schematic flow diagram illustrating some example embodiments according to other aspect of the disclosure.
[0114] Referring to FIG. 5, the user device 100 and the network device 106 are disclosed. The user device 100 may be UE 100 of FIGs. 1 to 2. There may be more than one user device in the cell (not shown) . The network device 106 is the satellite 106 of FIGs. 1 or 2 supporting the NTN (see, FIG. 2) . That is to say, the embodiment is appliable to the situation explained in FIG. 2. The UE 100 and network device 106 may be the apparatuses explained in FIG. 4.
[0115] At step S505, the network device 106 may configures first configuration information (e.g., CB-Msg3 configuration) and second configuration information (e.g., Msg4 configuration) .
[0116] For example, the network device 106 may configure a pool of RNTIs for Msg4 monitoring, which may be exclusive group of RNTIs for Msg4 monitoring.
[0117] The CB-Msg3 configuration (e.g., CB-Msg3-ConfigSIB) may indicate at least one of a CB-Msg3 transmission window, a starting SFN of the CB-Msg3 transmission window, a window size of the CB-Msg3 transmission window, or a window periodicity of the CB-Msg3 transmission window (see Fig. 3) .
[0118] The Network 106 may further configure either the number of one or more RNTIs per CB-Msg3 transmission window or the number of one or more RNTIs per consecutive CB-Msg3 transmission windows in each transmission window group to be used for deriving RNTIs. The CB-Msg3 configuration may further include a sub-window related configuration and the mapping related configuration if multiple RNTIs are configured per CB-Msg3 transmission window in order to reduce the Msg4 reception overhead from the UE perspective.
[0119] In case the multiple RNTIs are configured, for example, the network device 106 may configure a pool of RNTIs including 50 RNTIs and 5 RNTIs per CB-Msg3 transmission window. In such configuration, 50 RNTIs are grouped into 10 groups of which each group have 5 RNTIs. The CB-Msg3 transmission window will be also put into the transmission window group of which each group has 10 (=50 / 5) consecutive CB-Msg3 transmission windows. Then each RNTI group corresponds to each transmission window group.
[0120] For another example, the network device 106 may configure a pool of RNTIs including 50 RNTIs and 10 CB-Msg3 transmission windows in each transmission window group. In such configuration, the CB-Msg3 transmission window will be put into the transmission window group of which each group has 10 CB-Msg3 transmission windows. Each transmission window in the group corresponds to 5 (=50 / 10) RNTIs in the pool of configured 50 RNTIs.
[0121] Alternatively, the transmission window group may be implicitly indicated using at least one of CB-Msg3 configuration (e.g., the first configuration information (CB-Msg3 ConfigSIB) ) and Msg4 configuration (e.g., the second configuration information) . For instance, the number of consecutive transmission windows in one transmission window group may be calculated from the transmission window periodicity in CB-Msg3 configuration and the monitoring window size in msg4 configuration such as the number of transmission windows in the group = ceil (monitoring window size / transmission window periodicity) .
[0122] The Msg4 configuration (e.g., Msg4 -ConfigSIB) may comprise at least one of the followings: - the explicit configuration on the number of RNTIs corresponding to each of CB-Msg3 transmission windows; - the explicit configuration on the number of CB-Msg3 transmission windows in each window group for deriving RNTI of monitoring Msg4; - the RNTI-offset to steer Msg4 RNTI set to a certain RNTI range; or - the scaling factor of deriving RNTI from time domain resource index (e.g., the start SFN index of the DSA transmission window) .
[0123] The Msg4 configuration may be configured as a part of the CB-Msg3 configuration or be configured separately from the CB-Msg3 configuration.
[0124] Referring back to FIG. 5, at step S510, the network device may transmit the first configuration information (e.g., the CB-Msg3 configuration) and the second configuration information (e.g., the Msg4 configuration) . The network device may transmit the first and second configuration information via a system information block (SIB) .
[0125] At step S520, the user device 100 may randomly select one of CB-Msg3 resources in the transmission window (e.g., Msg3 transmission windows, refer to FIG. 3) . In case of DSA, the user device 100 may first select the next transmission window and then randomly select one of CB-Msg3 resources in the selected transmission window.
[0126] At step S530, the user device 100 may transmit the CB-Msg3 using the randomly selected resources from the transmission window according to the first configuration information (e.g., CB-Msg3-configSIB) .
[0127] At step S540a, the user device 100 may determine one or more RNTIs based on at least one of the selected CB-Msg3 resource, the first configuration information, or the second configuration information.
[0128] One embodiment of the disclosure, the user device 100 determines the one or more RNTIs based on the explicitly received configuration information at step S510.
[0129] Other embodiment of the disclosure, the user device 100 determines the one or more RNTIs based on the explicitly received information and / or implicitly configured information. Some of configurations may be implicitly configured based on other CB-Msg3 configuration and / Msg4 configuration parameters. For example, the maximum number of RNTIs for the Msg4 monitoring may be hard-coded in standard specification (e.g., TS38.331 of Rel-19) . In addition, the total number of the one or more RNTIs for Msg4 monitoring may be derived by the user device 100 from the configured CB-Msg3 window periodicity and Msg-4 monitoring window size (e.g. the number of RNTIs for Msg4 = ceil (Msg4 monitoring window size / Msg3 window periodicity) ) . This may be also used as the number of Msg3 transmission windows per window group.
[0130] The number of RNTIs per Msg3 transmission window may be derived from the configured CB-Msg3 window size in term of either in time domain or both time and frequency domain. For example, the number of RNTIs per Msg3 transmission window may be calculated by ceil (Msg3 window size / S) or floor (Msg3 window size / S) , where S is either configured by the network device or hard-coded in standard specification. S may be a scaling factor.
[0131] The user device 100, upon determining the CB-Msg3 transmission window and selecting the transmission resources within the transmission window for the CB-Msg3 transmission at step S520, is able to derive one or more RNTIs at step S540a to be used for monitor Msg4 transmission according to the configuration.
[0132] Meanwhile, when the network device 106 receives the CB-Msg3 at step S530, the network device 106 is able to determine the one or more RNTIs, step S540b.
[0133] At step 504b, the network device determines the one or more RNTIs for Msg4 transmission based on at least one of the resource where the CB-Msg3 is received, the first configuration information, or the second configuration information of S505.
[0134] Then, at step S550b, the network device 106 may transmit scheduling information indicating radio resources for transmitting a Msg4 to the user device 100.
[0135] At step S560, the network device 106 may perform a Msg4 transmission via the indicated radio resources.
[0136] Referring back to FIG. 5, at step S550a, the user device 100 may start monitor radio resources during the Msg4 monitoring window (see, FIG. 3) according to the received second configuration information by using the determined one or more RNTIs.
[0137] During the monitoring, the user device 100 may detect the scheduling information transmitted with the one or more determined RNTIs. The scheduling information may be transmitted included in a downlink control information via a physical downlink control channel (PDCCH) .
[0138] At step S560, the user device 100 is able to receive the Msg4 via the radio resource indicated by the scheduling information.
[0139] 3.1 Single RNTI
[0140] In one example of other aspect of the disclosure, if only one RNTI for each CB-Msg3 transmission window is configured, the RNTI will be used to monitor Msg4. In this case, at steps S430a, S430b, S540a, and S540b, the user device 100 and the network device 106 determine only one RNTI for monitoring the Msg4.
[0141] The case when the single RNTI is used, it is simpler from the user device perspective, having to monitor only a single RNTI for the Msg4, and also gives more possibility to multiplex Msg4 of different UEs.
[0142] There may be a false alarm of decoding Msg4 PDSCH when if a single RNTI is used for a Msg3 transmission window. But it is a tradeoff between the simplicity, the PDCCH saving gain got from Msg4 multiplexing and the UE power consumption for Msg4 PDSCH decoding. From system point of view, the single RNTI is good for IoT devices and good for efficient Msg4 delivery.
[0143] Therefore, a single RNTI may be configured or determined corresponding to one Msg3 transmission window. The different RNTIs may still be needed for different Msg3 transmission windows if Msg4 monitoring windows corresponding to different Msg3 transmission window are partially overlapping. For instance, as illustrated in FIG. 3, the different RNTI is needed for monitoring Msg4 corresponding to Msg3 transmission window #0 and Msg3 transmission window#i-1 as they are partially overlapping, but corresponding to different Msg3 Tx windows. The RNTI for monitoring Msg4 after Msg4 monitoring window #i-1 (not illustrated in FIG. 3) can be reused. Thus the total number of RNTIs to be used for Msg4 monitoring may be determined from the transmission window periodicity in CB-Msg3 configuration and the monitoring window size in msg4 configuration such as the total number of RNTIs = ceil (monitoring window size / transmission window periodicity) .
[0144] In this example of other aspect, the RNTI for Msg4 reception can be reused by different Msg3 transmission windows if the Msg4 monitoring windows corresponding to the different Msg3 transmission windows are not overlapping.
[0145] In this case, the RNTI may be derived by taking into account the Msg4 monitoring window size and Msg3 transmission window periodicity. For example, the RNTI for Msg4 reception may be derived using formular 1: [Formular 1] RNTI = X + Msg3_W_index mod (ceil (Msg4_WS / Msg3_WP) ) + ceil (Msg4_WS / Msg3_WP) *carrier_id.
[0146] Where X is the starting RNTI for Msg4 reception. X may be hardcoded in the standard document or configured by the high layer signaling (e.g., RRC or MAC signal) . The X may be set to 1 or any other value.
[0147] Msg3_W_index is the index of Msg3 transmission window within a periodicity of 1024 SFNs, and index 0 (i.e., Msg3_W_index = 0) corresponds to the Msg3 transmission window starts at the SFN defined by IE startSFN-19. If Msg3 transmission window periodicity is larger than 1024 system frames, the Hyper-SFN (HSFN) may be considered for defining Msg3_W_index. For instance, a few least significant bits of HSFN may be used as the periodicity to define Msg3_W_index.
[0148] Msg4_WS is the monitoring window size of Msg4, and Msg3_WP is the transmission window periodicity of Msg3.
[0149] The above formular is used for deriving the RNTI for Msg4 monitoring if a single RNTI per Msg3 transmission window is configured.
[0150] In another embodiment of using a single RNTI, the single RNTI may be associated with a CB-Msg3 transmission window. The RNTI may be determined based on the start or end SFN of the Msg3 transmission window. Alternatively, The RNTI may be determined based on a logical index for the Msg3 transmission window, where the Msg3 transmission windows are indexed sequentially based on their periodicity starting at SFN =0.
[0151] Alternatively, the single RNTI may be derived by the user device 100 or the network device 106 of FIGs 4 or 5 by using one of the formulas: 1) Msg4 RNTI = RNTI-offset + CB-Msg3 window start SFN; 2) Msg4 RNTI = RNTI-offset + floor (CB-Msg3 window start SFN / S) ; 3) Msg4 RNTI = RNTI-offset + mod (CB-Msg3 window start SFN / S) ; 4) Msg4 RNTI = RNTI-offset + floor (CB-Msg3 window start SFN / window periodicity) ; 5) Msg4 RNTI = RNTI-offset + floor (CB-Msg3 window start SFN / CB-Msg3 transmission window size) ; 6) Msg4 RNTI = RNTI-offset + mod (CB-Msg3 window start SFN / CB-Msg3 transmission window size) ; 7) Msg4 RNTI = RNTI-offset + floor (CB-Msg3 window start SFN / window periodicity) ; or 8) Msg4 RNTI = RNTI-offset + (floor (CB-Msg3 window start SFN / window periodicity) ) mod (floor (Msg4 monitoring window size / window periodicity) )
[0152] The RNTI-offset may be configured by the network device to steer the RNTI set to a certain range or may be hardcoded in the standard document or the user device. The value S may be a network device configured scaling factor and it may be an integer value equal to or greater than 1. The window periodicity may be the CB-Msg3 window periodicity. The RNTI-offset may be ‘X’ of Formula 1, and it indicates the starting RNTI for Msg4 reception. The RNTI-offset may be hardcoded in the standard document or configured by the high layer signaling (e.g., RRC or MAC signal) . The RNTI-offset may be set to 1 or any other value.
[0153] 3.2 multiple RNTI
[0154] In other example of other aspect of the disclosure, if multiple RNTIs for each CB-Msg3 transmission window is configured, the multiple RNTI will be used to monitor Msg4. In this case, at steps S430a, S430b, S540a, and S540b, the user device 100 and the network device 106 determine multiple RNTIs for monitoring the Msg4.
[0155] The user device 100 may need to monitor up to k RNTIs (e.g., k is an integer value greater than 1, properly 4 or 5) just for Msg4 reception since the number of Msg3 replicas within a Msg3 transmission window can be: 2, 3, or 4. This may add extra complexity to IoT NTN UEs. Furthermore, multiple UEs with one Msg4 may save the PDCCH for Msg4 scheduling and enabling multiple RNTIs for a Msg3 transmission window may impact the multiplexing gain of Msg4. But multiple RNTIs may help to reduce the false alarm for UE to receive non-relevant Msg4.
[0156] In case the multiple RNTIs for a Msg3 transmission window are configured, the number of sub-windows within one Msg3 transmission window may be either configured by the network or divided according to the number of RNTIs per Msg3 transmission window configured by the network device. The RNTIs may be derived by taking into account the sub-windows as well. For example, the RNTIs for Msg4 reception may be derived using formular 2: [Formular 2] RNTI = X + n_sw mod (N_sw) + N_sw* (Msg3_W_index mod (ceil (Msg4 window size / Msg3 window periodicity) ) ) + N_sw *ceil (Msg4 window size / Msg3 window periodicity) *carrier_id
[0157] In formular 2, X is the starting RNTI for Msg4 monitoring, n_sw is the index of sub-window in which the Msg3 replica is transmitted, N_sw is the number of sub-windows per Msg3 transmission window, and SFN_id is the starting SNF of Msg3 transmission window. Carrier_id may indicate a carrier where the Msg3 and / or Msg4 is transmitted. Msg3_W_index is the index of Msg3 transmission window within a periodicity of 1024 SFNs and index 0 corresponds to the Msg3 transmission window starts at the SFN defined by IE startSFN-19. If Msg3 transmission window periodicity is larger than 1024 system frames, the Hyper-SFN (HSFN) may be considered for defining Msg3_W_index. For instance, a few least significant bits of HSFN may be used as the periodicity to define Msg3_W_index
[0158] The formular 2 is used for deriving multiple RNTIs for Msg4 monitoring if the multiple RNTIs per Msg3 transmission window is configured.
[0159] In other example of other aspect of the disclosure, if multiple RNTIs (e.g., 5 RNTIs) for each CB-Msg3 transmission window are configured, the user device 100 may determine the multiple RNTIs. In this case, each CB-Msg3 transmission window may be configured to have multiple sub-windows in term of time domain or time and frequency domain.
[0160] In one option, the CB-Msg3 transmission is configured to have multiple sub-windows divided in time domain. For example, if there are 5 RNTIs per CB-Msg3 transmission window, the CB-Msg3 transmission window is configured to have 5 sub-windows and each sub-window is one fifth of the CB-Msg3 transmission window. The user device may determine the RNTI from the 5 RNTIs according to which sub-window theuser device transmits the Msg3 replica. In this option, the different Msg3 replica transmission may be mapped to different RNTI. The user device may need to monitor multiple RNTIs for Msg4 reception. Alternatively, the user device may first select the sub-window within the selected transmission window and then select the resources only within the selected sub-window for Msg3 replica transmission. In this way, the user device only needs to monitor one RNTI for Msg4 reception.
[0161] In another option, the CB-Msg3 transmission window is configured to have multiple sub-windows using the resource index. That is the time and / or frequency domain resources in each CB-Msg3 transmission window is indexed with i. Each sub-window k will include the resource indexed with i if i mod (N) =k, where N is the number of sub-windows within one transmission window, which equals to the number RNTIs per transmission window.
[0162] For example, if there are 5 RNTIs per transmission window and there are 100 resource indexed from 1 to 100 in the transmission window. Then sub-window 1 includes resource index ‘i' if i mod (5) =1, i.e. 1, 6, 11.., sub-window 2 includes resource index ‘j’ if j mod (5) =2, i.e. 2, 7, 12…and so on. Then each RNTI of 5 RNTI corresponds to one of sub-window. In this option, when UE select the resource for Msg3 DSA replica transmission, UE first selects the sub-window and then only select the resource corresponding to the same sub-window and then determine the RNTI associated with the sub-window for Msg4 monitoring e.g. using the formular 2 described above.
[0163] In the above explained embodiments, the sub-windows may be uniformly distributed in the Msg3 transmission window such that each sub-window has the same size and the sum corresponds to the Msg3 window size.
[0164] In the above explained embodiments of all the aspect of the disclosure, the operations “ceil” , “mod” , and / or “floor” were used for determining one or more RNTIs. The ceiling function (ceil) denoted by ceil (x) or □x □, gives the smallest integer greater than or equal to x. The floor function (floor) , denoted by floor (x) or □x □, and gives the largest integer less than or equal to x. The modulo operation (mod) , denoted by x mod y or x %y, gives the remainder when x is divided by y.
[0165] In the above explained embodiments of all the aspect of the disclosure, the second configuration information related to the Msg4 monitoring window may be called the second configuration information related to contention based Msg4 monitoring window or second configuration information related to contention based Msg4 monitoring.
[0166] FIG. 6 illustrates an example of an apparatus 600 comprising means for performing one or more of the example embodiments described above. For example, the apparatus 600 may be, or comprise, or be comprised in, the user device 100. The apparatus 600 may perform the operations disclosed in FIGs. 1 to 5.
[0167] The apparatus 600 may comprise a circuitry or a chipset applicable for realizing one or more of the example embodiments described above. For example, the apparatus 600 may comprise at least one processor 610. The at least one processor 610 interprets instructions (e.g., computer program instructions) and processes data. The at least one processor 610 may comprise one or more programmable processors. The at least one processor 610 may comprise programmable hardware with embedded firmware and may, alternatively or additionally, comprise one or more application-specific integrated circuits (ASICs) .
[0168] The at least one processor 610 is coupled to at least one memory 620. The at least one processor is configured to read and write data to and from the at least one memory 620. The at least one memory 620 may comprise one or more memory units. The memory units may be volatile or non-volatile. It is to be noted that there may be one or more units of non-volatile memory and one or more units of volatile memory or, alternatively, one or more units of non-volatile memory, or, alternatively, one or more units of volatile memory. Volatile memory may be for example random-access memory (RAM) , dynamic random-access memory (DRAM) or synchronous dynamic random-access memory (SDRAM) . Non-volatile memory may be for example read-only memory (ROM) , programmable read-only memory (PROM) , electronically erasable programmable read-only memory (EEPROM) , flash memory, optical storage or magnetic storage. In general, memories may be referred to as non-transitory computer readable media. The term “non-transitory, ” as used herein, is a limitation of the medium itself (i.e., tangible, not a signal) as opposed to a limitation on data storage persistency (e.g., RAM vs. ROM) . The at least one memory 620 stores computer readable instructions that are executed by the at least one processor 610 to perform one or more of the example embodiments described above. For example, non-volatile memory stores the computer readable instructions, and the at least one processor 610 executes the instructions using volatile memory for temporary storage of data and / or instructions. The computer readable instructions may refer to computer program code.
[0169] The computer readable instructions may have been pre-stored to the at least one memory 620 or, alternatively or additionally, they may be received, by the apparatus, via an electromagnetic carrier signal and / or may be copied from a physical entity such as a computer program product. Execution of the computer readable instructions by the at least one processor 610 causes the apparatus 600 to perform one or more of the aspects of the disclosure described above. That is, the at least one processor and the at least one memory storing the instructions may provide the means for providing or causing the performance of any of the methods and / or blocks described above.
[0170] The apparatus 600 may further comprise, or be connected to, an input unit 630. The input unit 630 may comprise one or more interfaces for receiving input. The one or more interfaces may comprise for example one or more temperature, motion and / or orientation sensors, one or more cameras, one or more accelerometers, one or more microphones, one or more buttons and / or one or more touch detection units. Further, the input unit 630 may comprise an interface to which external devices may connect to.
[0171] The apparatus 600 may also comprise an output unit 640. The output unit may comprise or be connected to one or more displays capable of rendering visual content, such as a light emitting diode (LED) display, a liquid crystal display (LCD) and / or a liquid crystal on silicon (LCoS) display. The output unit 640 may further comprise one or more audio outputs. The one or more audio outputs may be for example loudspeakers.
[0172] The apparatus 600 further comprises a connectivity unit 650. The connectivity unit 650 enables wireless connectivity to one or more external devices. The connectivity unit 650 comprises at least one transmitter and at least one receiver that may be integrated to the apparatus 600 or that the apparatus 600 may be connected to. The at least one transmitter comprises at least one transmission antenna, and the at least one receiver comprises at least one receiving antenna. The connectivity unit 650 may comprise an integrated circuit or a set of integrated circuits that provide the wireless communication capability for the apparatus 600. Alternatively, the wireless connectivity may be a hardwired application-specific integrated circuit (ASIC) . The connectivity unit 650 may also provide means for performing at least some of the blocks or functions of one or more example embodiments described above. The connectivity unit 650 may comprise one or more components, such as: power amplifier, digital front end (DFE) , analog-to-digital converter (ADC) , digital-to-analog converter (DAC) , frequency converter, (de) modulator, and / or encoder / decoder circuitries, controlled by the corresponding controlling units.
[0173] It is to be noted that the apparatus 600 may further comprise various components not illustrated in FIG. 6. The various components may be hardware components and / or software components.
[0174] The apparatus 600 may perform or be applied with the embodiments described above. More specifically, the apparatus 600 may be the user device 100, and the user device 100 may be configured to perform one of the methods explained by using FIGs. 1 to 5.
[0175] FIG. 7 illustrates an example of an apparatus 700 comprising means for performing one or more of the example embodiments described above. For example, the apparatus 700 may be an apparatus such as, or comprising, or comprised in, the network entity or the network device 106, and support the embodiments and examples described above.
[0176] The network device 106 may also be referred to, for example, as a network element, a next generation radio access network (NG-RAN) node, a NodeB, an eNB, a gNB, a base transceiver station (BTS) , a base station, an NR base station, a 5G base station, an access node, an access point (AP) , a cell site, a relay node, a repeater, an integrated access and backhaul (IAB) node, an IAB donor node, a distributed unit (DU) , a central unit (CU) , a baseband unit (BBU) , a radio unit (RU) , a radio head, a remote radio head (RRH) , or a transmission and reception point (TRP) .
[0177] The apparatus 700 may comprise, for example, a circuitry or a chipset applicable for realizing one or more of the example embodiments described above. The apparatus 700 may be an electronic device comprising one or more electronic circuitries. The apparatus 700 may comprise a communication control circuitry 710 such as at least one processor, and at least one memory 720 storing instructions 722 which, when executed by the at least one processor, cause the apparatus 700 to carry out one or more of the example embodiments described above. Such instructions 722 may, for example, include computer program code (software) . The at least one processor and the at least one memory storing the instructions may provide the means for providing or causing the performance of any of the methods and / or blocks described above.
[0178] The processor is coupled to the memory 720. The processor is configured to read and write data to and from the memory 720. The memory 720 may comprise one or more memory units. The memory units may be volatile or non-volatile. It is to be noted that there may be one or more units of non-volatile memory and one or more units of volatile memory or, alternatively, one or more units of non-volatile memory, or, alternatively, one or more units of volatile memory. Volatile memory may be for example random-access memory (RAM) , dynamic random-access memory (DRAM) or synchronous dynamic random-access memory (SDRAM) . Non-volatile memory may be for example read-only memory (ROM) , programmable read-only memory (PROM) , electronically erasable programmable read-only memory (EEPROM) , flash memory, optical storage or magnetic storage. In general, memories may be referred to as non-transitory computer readable media. The term “non-transitory, ” as used herein, is a limitation of the medium itself (i.e., tangible, not a signal) as opposed to a limitation on data storage persistency (e.g., RAM vs. ROM) . The memory 720 stores computer readable instructions that are executed by the processor. For example, non-volatile memory stores the computer readable instructions, and the processor executes the instructions using volatile memory for temporary storage of data and / or instructions.
[0179] The computer readable instructions may have been pre-stored to the memory 720 or, alternatively or additionally, they may be received, by the apparatus, via an electromagnetic carrier signal and / or may be copied from a physical entity such as a computer program product. Execution of the computer readable instructions causes the apparatus 700 to perform one or more of the functionalities described above.
[0180] The memory 720 may be implemented using any suitable data storage technology, such as semiconductor-based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed memory and / or removable memory.
[0181] The apparatus 700 may further comprise or be connected to a communication interface 730, such as a radio unit, comprising hardware and / or software for realizing communication connectivity with one or more wireless communication devices according to one or more communication protocols. The communication interface 730 comprises at least one transmitter (Tx) and at least one receiver (Rx) that may be integrated to the apparatus 700 or that the apparatus 700 may be connected to. The communication interface 730 may provide means for performing some of the blocks for one or more example embodiments described above. The communication interface 730 may comprise one or more components, such as: power amplifier, digital front end (DFE) , analog-to-digital converter (ADC) , digital-to-analog converter (DAC) , frequency converter, (de) modulator, and / or encoder / decoder circuitries, controlled by the corresponding controlling units.
[0182] The communication interface 730 provides the apparatus with radio communication capabilities to communicate in the wireless communication network. The communication interface may, for example, provide a radio interface to one or more wireless communication devices. The apparatus 700 may further comprise or be connected to another interface towards a core network such as the network coordinator apparatus or AMF, and / or to the access nodes of the wireless communication network.
[0183] The apparatus 700 may further comprise a scheduler 740 that is configured to allocate radio resources. The scheduler 740 may be configured along with the communication control circuitry 710 or it may be separately configured.
[0184] It is to be noted that the apparatus 700 may further comprise various components not illustrated in FIG. 7. The various components may be hardware components and / or software components.
[0185] The apparatus 700 may perform or be applied with the embodiments described above. More specifically, the apparatus 700 may be the network device 104, and the network device 104 may be configured to perform one of the methods explained by using FIGs. 1 to 5.
[0186] The techniques and methods described herein may be implemented by various means. For example, these techniques may be implemented in hardware (one or more devices) , firmware (one or more devices) , software (one or more modules) , or combinations thereof. For a hardware implementation, the apparatus (es) of example embodiments may be implemented within one or more application-specific integrated circuits (ASICs) , digital signal processors (DSPs) , digital signal processing devices (DSPDs) , programmable logic devices (PLDs) , field programmable gate arrays (FPGAs) , graphics processing units (GPUs) , processors, controllers, micro-controllers, microprocessors, other electronic units designed to perform the functions described herein, or a combination thereof. For firmware or software, the implementation can be carried out through modules of at least one chipset (for example procedures, functions, and so on) that perform the functions described herein. The software codes may be stored in a memory unit and executed by processors. The memory unit may be implemented within the processor or externally to the processor. In the latter case, it can be communicatively coupled to the processor via various means, as is known in the art. Additionally, the components of the systems described herein may be rearranged and / or complemented by additional components in order to facilitate the achievements of the various aspects, etc., described with regard thereto, and they are not limited to the precise configurations set forth in the given figures, as will be appreciated by one skilled in the art.
[0187] It will be obvious to a person skilled in the art that, as technology advances, the inventive concept may be implemented in various ways. The embodiments are not limited to the example embodiments described above, but may vary within the scope of the claims. Therefore, all words and expressions should be interpreted broadly, and they are intended to illustrate, not to restrict, the embodiments.
Claims
An apparatus for communication, comprising:at least one processor; andat least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform:receiving first configuration information related to a contention based message 3, Msg3, transmission window and second configuration information related to a message 4, Msg4, monitoring window ;transmitting a Msg3 in a transmission window according to the first configuration information;determining one or more radio network temporary identifiers, RNTIs, based on at least one of the first configuration information or the second configuration information;monitoring scheduling information of a Msg4 by using the determined one or more RNTIs; andreceiving the Msg4 based on the monitored scheduling information.The apparatus of claim 1, wherein the first configuration information indicates at least one of:a number of replicas of the Msg3;a start system frame number, SFN, of the Msg3 transmission window;a size of the Msg3 transmission window;a transmission window periodicity;a number of consecutive Msg3 transmission windows in a transmission window group;a number of sub-windows within one Msg3 transmission window; ora sub-window size in terms of at least one of time domain and frequency domain resource.The apparatus of claim 1 or 2, wherein the second configuration information indicates at least one of:a monitoring window size of the Msg4;a number of the one or more RNTIs corresponding to a Msg3 transmission window;a number of consecutive Msg3 transmission windows in a transmission window group;an offset value of a starting RNTI; ora scaling factor.The apparatus of claim 3, wherein the one or more RNTIs are determined further based on at least one of the size of transmission window, the transmission window periodicity, the number of sub-windows, the monitoring window size, or an identifier of a carrier, andwherein the one or more RNTIs correspond to a Msg3 transmission window.The apparatus of any one of claims 1 to 4, wherein the apparatus is further caused to perform at least one of:obtaining a maximum number of the one or more RNTIs; ordetermining a total number of the one or more RNTIs based on the transmission window size and the monitoring window size.The apparatus of any one of claims 1 to 4, wherein the apparatus is further caused to perform:determining a total number of the one or more RNTIs based on the transmission window size and scaling factor.An apparatus for communication, comprising:at least one processor; andat least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform:transmitting first configuration information related to a contention based message 3, Msg3, transmission window and second configuration information related to a message 4, Msg4, monitoring window,receiving a Msg3 in a transmission window based on the first configuration information;determining one or more radio network temporary identifiers, RNTIs, based on at least one of the received Msg3 or the second configuration information;transmitting scheduling information of a Msg4 by using the determined one or more RNTIs; andtransmitting the Msg4 based on the scheduling information.The apparatus of claim 7, wherein the apparatus is further cause to perform:configuring the one or more RNTIs per a Msg3 transmission window or a number of consecutive Msg3 transmission windows in a transmission window group; anddetermining, based on the configured one or more RNTIs, the first configuration information and the second configuration information.The apparatus of claim 7 or 8, wherein the first configuration information indicates at least one of:a number of replicas of the Msg3;a start system frame number, SFN, of the Msg3 transmission window;a size of the Msg3 transmission window;a transmission window periodicity;a number of consecutive Msg3 transmission windows in a transmission window group;a number of sub-windows within one Msg3 transmission window; ora sub-window size in term of at least one of time domain and frequency domain resource.The apparatus of any one of claims 7 to 9, wherein the second configuration information comprises at least one of:a monitoring window size of the Msg4;a number of the one or more RNTIs corresponding to a Msg3 transmission window;a number of consecutive Msg3 transmission windows in a transmission window group;an offset value of a starting RNTI; ora scaling factor.The apparatus of claim 10, wherein the one or more RNTIs are determined based on at least one of the size of transmission window, the transmission window periodicity, the number of sub-windows, the monitoring window size, or an identifier of a carrier, andwherein the one or more RNTIs correspond to a Msg3 transmission window.A method for communication, the method comprising:receiving, by a user device from a network device, first configuration information related to a contention based message 3, Msg3, transmission window and second configuration information related to a message 4, Msg4, monitoring window;transmitting, by the user device to the network device, a Msg3 in a transmission window according to the first configuration information;determining, by the user device, one or more radio network temporary identifiers, RNTIs, based on at least one of the first configuration information or the second configuration information;monitoring, by the user device, scheduling information of a Msg4 by using the determined one or more RNTIs; andreceiving, by the user device from the network device, the Msg4 based on the monitored scheduling information.A method for communication, the method comprising:transmitting, by a network device to a user device, first configuration information related to a contention based message 3, Msg3, transmission window and second configuration information related to a message 4, Msg4, monitoring window;receiving, by the network device from the user device, a Msg3 in a transmission window according to the first configuration information;determining, by the network device, one or more radio network temporary identifiers, RNTIs, based on at least one of the received Msg3 or the second configuration information;transmitting, by the network device to the user device, scheduling information of a Msg4 by using the determined one or more RNTIs; andtransmitting, by the network device to the user device, the Msg4 based on the scheduling information.A computer program comprising instructions, which when executed by an apparatus, cause the apparatus to perform the method of claim 12 or 13.A computer readable storage medium having stored thereon the computer program of claim 14.The computer readable storage medium of claim 15, wherein the computer readable storage medium is a non-transitory computer readable medium.