Beam selection in adaptive beam burst

Abstract

A method and apparatus for beam selection in adaptive beam burst is provided. A wireless device receives information related to multiple beam burst types from a network, identifies a type of the beam burst based on the information, measures a beam burst based on identifying the type of the beam burst, and communicates with the network based on a measurement result of the beam burst.

Description

BEAM SELECTION IN ADAPTIVE BEAM BURST

[0001] The present disclosure relates to beam selection in adaptive beam burst.

[0002] 3rd Generation Partnership Project (3GPP) New Radio (NR) targets a single technical framework addressing all usage scenarios, requirements and deployment scenarios including enhanced Mobile BroadBand (eMBB), massive Machine Type Communications (mMTC), Ultra-Reliable and Low Latency Communications (URLLC), etc. The NR shall be inherently forward compatible. Further, the NR should be able to use any spectrum band ranging at least up to 100 GHz that may be made available for wireless communications even in a more distant future.

[0003] 6G is the successor to 5G cellular technology. 6G networks will be able to use higher frequencies than 5G networks and provide substantially higher capacity and much lower latency. The 6G technology market is expected to facilitate large improvements in the areas of imaging, presence technology and location awareness. Working in conjunction with Artificial Intelligence (AI), the 6G computational infrastructure will be able to identify the best place for computing to occur. This includes decisions about data storage, processing and sharing.

[0004] In an aspect, a method is provided. The method comprises receiving information related to multiple beam burst types from a network, identifying a type of the beam burst based on the information, measuring a beam burst based on identifying the type of the beam burst, and communicating with the network based on a measurement result of the beam burst.

[0005] In another aspect, an apparatus for implementing the above method is provided.

[0006] FIG. 1 shows an example of a communication system to which implementations of the present disclosure are applied.

[0007] FIG. 2 shows an example of wireless devices to which implementations of the present disclosure are applied.

[0008] FIG. 3 shows an example of UE to which implementations of the present disclosure are applied.

[0009] FIGS. 4 and 5 show an example of protocol stacks in a 3GPP based wireless communication system to which implementations of the present disclosure are applied.

[0010] FIG. 6 shows a frame structure in a 3GPP based wireless communication system to which implementations of the present disclosure are applied.

[0011] FIG. 7 shows a data flow example in the 3GPP NR system to which implementations of the present disclosure are applied.

[0012] FIG. 8 shows an example of a method to which implementations of the present disclosure are applied.

[0013] FIG. 9 shows an example of another method to which implementations of the present disclosure are applied.

[0014] FIG. 8 shows an example of a method to which implementations of the present disclosure are applied.

[0015] FIG. 9 shows an example of another method to which implementations of the present disclosure are applied.

[0016] FIG. 10 shows an example of an adaptive beam burst transmission and beam selection to which implementations of the present disclosure are applied.

[0017] FIG. 11 shows another example of an adaptive beam burst transmission and beam selection to which implementations of the present disclosure are applied.

[0018] FIG. 12 shows another example of an adaptive beam burst transmission and beam selection to which implementations of the present disclosure are applied.

[0019] FIG. 13 shows another example of an adaptive beam burst transmission and beam selection to which implementations of the present disclosure are applied.

[0020] The following techniques, apparatuses, and systems may be applied to a variety of wireless multiple access systems. Examples of the multiple access systems include a Code Division Multiple Access (CDMA) system, a Frequency Division Multiple Access (FDMA) system, a Time Division Multiple Access (TDMA) system, an Orthogonal Frequency Division Multiple Access (OFDMA) system, a Single Carrier Frequency Division Multiple Access (SC-FDMA) system, and a Multi Carrier Frequency Division Multiple Access (MC-FDMA) system. CDMA may be embodied through radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be embodied through radio technology such as Global System for Mobile communications (GSM), General Packet Radio Service (GPRS), or Enhanced Data rates for GSM Evolution (EDGE). OFDMA may be embodied through radio technology such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, or Evolved UTRA (E-UTRA). UTRA is a part of a Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long-Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS) using E-UTRA. 3GPP LTE employs OFDMA in Downlink (DL) and SC-FDMA in Uplink (UL). Evolution of 3GPP LTE includes LTE-Advanced (LTE-A), LTE-A Pro, 5G New Radio (NR) and / or 6G.

[0021] For convenience of description, implementations of the present disclosure are mainly described in regards to a 3GPP based wireless communication system. However, the technical features of the present disclosure are not limited thereto. For example, although the following detailed description is given based on a mobile communication system corresponding to a 3GPP based wireless communication system, aspects of the present disclosure that are not limited to 3GPP based wireless communication system are applicable to other mobile communication systems.

[0022] For terms and technologies which are not specifically described among the terms of and technologies employed in the present disclosure, the wireless communication standard documents published before the present disclosure may be referenced.

[0023] In the present disclosure, "A or B" may mean "only A", "only B", or "both A and B". In other words, "A or B" in the present disclosure may be interpreted as "A and / or B". For example, "A, B or C" in the present disclosure may mean "only A", "only B", "only C", or "any combination of A, B and C".

[0024] In the present disclosure, slash ( / ) or comma (,) may mean "and / or". For example, "A / B" may mean "A and / or B". Accordingly, "A / B" may mean "only A", "only B", or "both A and B". For example, "A, B, C" may mean "A, B or C".

[0025] In the present disclosure, "at least one of A and B" may mean "only A", "only B" or "both A and B". In addition, the expression "at least one of A or B" or "at least one of A and / or B" in the present disclosure may be interpreted as same as "at least one of A and B".

[0026] In addition, in the present disclosure, "at least one of A, B and C" may mean "only A", "only B", "only C", or "any combination of A, B and C". In addition, "at least one of A, B or C" or "at least one of A, B and / or C" may mean "at least one of A, B and C".

[0027] Also, parentheses used in the present disclosure may mean "for example". In detail, when it is shown as "control information (PDCCH)", "PDCCH" may be proposed as an example of "control information". In other words, "control information" in the present disclosure is not limited to "PDCCH", and "PDCCH" may be proposed as an example of "control information". In addition, even when shown as "control information (i.e., PDCCH)", "PDCCH" may be proposed as an example of "control information".

[0028] Technical features that are separately described in one drawing in the present disclosure may be implemented separately or simultaneously.

[0029] Although not limited thereto, various descriptions, functions, procedures, suggestions, methods and / or operational flowcharts of the present disclosure disclosed herein can be applied to various fields requiring wireless communication and / or connection (e.g., 5G) between devices.

[0030] Hereinafter, the present disclosure will be described in more detail with reference to drawings. The same reference numerals in the following drawings and / or descriptions may refer to the same and / or corresponding hardware blocks, software blocks, and / or functional blocks unless otherwise indicated.

[0031] FIG. 1 shows an example of a communication system to which implementations of the present disclosure are applied.

[0032] The 5G usage scenarios shown in FIG. 1 are only exemplary, and the technical features of the present disclosure can be applied to other 5G usage scenarios which are not shown in FIG. 1.

[0033] Three main requirement categories for 5G include (1) a category of enhanced Mobile BroadBand (eMBB), (2) a category of massive Machine Type Communication (mMTC), and (3) a category of Ultra-Reliable and Low Latency Communications (URLLC).

[0034] Referring to FIG. 1, the communication system 1 includes wireless devices 100a to 100f, Base Stations (BSs) 200, and a network 300. Although FIG. 1 illustrates a 5G network as an example of the network of the communication system 1, the implementations of the present disclosure are not limited to the 5G system, and can be applied to the future communication system beyond the 5G system.

[0035] The BSs 200 and the network 300 may be implemented as wireless devices and a specific wireless device may operate as a BS / network node with respect to other wireless devices.

[0036] The wireless devices 100a to 100f represent devices performing communication using Radio Access Technology (RAT) (e.g., 5G NR or LTE) and may be referred to as communication / radio / 5G devices. The wireless devices 100a to 100f may include, without being limited to, a robot 100a, vehicles 100b-1 and 100b-2, an eXtended Reality (XR) device 100c, a hand-held device 100d, a home appliance 100e, an Internet-of-Things (IoT) device 100f, and an Artificial Intelligence (AI) device / server 400. For example, the vehicles may include a vehicle having a wireless communication function, an autonomous driving vehicle, and a vehicle capable of performing communication between vehicles. The vehicles may include an Unmanned Aerial Vehicle (UAV) (e.g., a drone). The XR device may include an Augmented Reality (AR) / Virtual Reality (VR) / Mixed Reality (MR) device and may be implemented in the form of a Head-Mounted Device (HMD), a Head-Up Display (HUD) mounted in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, etc. The hand-held device may include a smartphone, a smartpad, a wearable device (e.g., a smartwatch or a smartglasses), and a computer (e.g., a notebook). The home appliance may include a TV, a refrigerator, and a washing machine. The IoT device may include a sensor and a smartmeter.

[0037] In the present disclosure, the wireless devices 100a to 100f may be called User Equipments (UEs). A UE may include, for example, a cellular phone, a smartphone, a laptop computer, a digital broadcast terminal, a Personal Digital Assistant (PDA), a Portable Multimedia Player (PMP), a navigation system, a slate Personal Computer (PC), a tablet PC, an ultrabook, a vehicle, a vehicle having an autonomous traveling function, a connected car, an UAV, an AI module, a robot, an AR device, a VR device, an MR device, a hologram device, a public safety device, an MTC device, an IoT device, a medical device, a FinTech device (or a financial device), a security device, a weather / environment device, a device related to a 5G service, or a device related to a fourth industrial revolution field.

[0038] The wireless devices 100a to 100f may be connected to the network 300 via the BSs 200. An AI technology may be applied to the wireless devices 100a to 100f and the wireless devices 100a to 100f may be connected to the AI server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR) network, and a beyond-5G network. Although the wireless devices 100a to 100f may communicate with each other through the BSs 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., sidelink communication) with each other without passing through the BSs 200 / network 300. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., Vehicle-to-Vehicle (V2V) / Vehicle-to-everything (V2X) communication). The IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0039] Wireless communication / connections 150a, 150b and 150c may be established between the wireless devices 100a to 100f and / or between wireless device 100a to 100f and BS 200 and / or between BSs 200. Herein, the wireless communication / connections may be established through various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication (or Device-to-Device (D2D) communication) 150b, inter-base station communication 150c (e.g., relay, Integrated Access and Backhaul (IAB)), etc. The wireless devices 100a to 100f and the BSs 200 / the wireless devices 100a to 100f may transmit / receive radio signals to / from each other through the wireless communication / connections 150a, 150b and 150c. For example, the wireless communication / connections 150a, 150b and 150c may transmit / receive signals through various physical channels. To this end, at least a part of various configuration information configuring processes, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, and resource mapping / de-mapping), and resource allocating processes, for transmitting / receiving radio signals, may be performed based on the various proposals of the present disclosure.

[0040] NR supports multiples numerologies (and / or multiple Sub-Carrier Spacings (SCS)) to support various 5G services. For example, if SCS is 15 kHz, wide area can be supported in traditional cellular bands, and if SCS is 30 kHz / 60 kHz, dense-urban, lower latency, and wider carrier bandwidth can be supported. If SCS is 60 kHz or higher, bandwidths greater than 24.25 GHz can be supported to overcome phase noise.

[0041] The NR frequency band may be defined as two types of frequency range, i.e., Frequency Range 1 (FR1) and Frequency Range 2 (FR2). The numerical value of the frequency range may be changed. For example, the frequency ranges of the two types (FR1 and FR2) may be as shown in Table 1 below. For ease of explanation, in the frequency ranges used in the NR system, FR1 may mean "sub 6 GHz range", FR2 may mean "above 6 GHz range," and may be referred to as millimeter Wave (mmW).

[0042] Frequency Range designationCorresponding frequency rangeSubcarrier SpacingFR1450MHz - 6000MHz15, 30, 60kHzFR224250MHz - 52600MHz60, 120, 240kHz

[0043] As mentioned above, the numerical value of the frequency range of the NR system may be changed. For example, FR1 may include a frequency band of 410MHz to 7125MHz as shown in Table 2 below. That is, FR1 may include a frequency band of 6GHz (or 5850, 5900, 5925 MHz, etc.) or more. For example, a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or more included in FR1 may include an unlicensed band. Unlicensed bands may be used for a variety of purposes, for example for communication for vehicles (e.g., autonomous driving).

[0044] Frequency Range designationCorresponding frequency rangeSubcarrier SpacingFR1410MHz - 7125MHz15, 30, 60kHzFR224250MHz - 52600MHz60, 120, 240kHz

[0045] Here, the radio communication technologies implemented in the wireless devices in the present disclosure may include NarrowBand IoT (NB-IoT) technology for low-power communication as well as LTE, NR and 6G. For example, NB-IoT technology may be an example of Low Power Wide Area Network (LPWAN) technology, may be implemented in specifications such as LTE Cat NB1 and / or LTE Cat NB2, and may not be limited to the above-mentioned names. Additionally and / or alternatively, the radio communication technologies implemented in the wireless devices in the present disclosure may communicate based on LTE-M technology. For example, LTE-M technology may be an example of LPWAN technology and be called by various names such as enhanced MTC (eMTC). For example, LTE-M technology may be implemented in at least one of the various specifications, such as 1) LTE Cat 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE Machine Type Communication, and / or 7) LTE M, and may not be limited to the above-mentioned names. Additionally and / or alternatively, the radio communication technologies implemented in the wireless devices in the present disclosure may include at least one of ZigBee, Bluetooth, and / or LPWAN which take into account low-power communication, and may not be limited to the above-mentioned names. For example, ZigBee technology may generate Personal Area Networks (PANs) associated with small / low-power digital communication based on various specifications such as IEEE 802.15.4 and may be called various names.

[0046] FIG. 2 shows an example of wireless devices to which implementations of the present disclosure are applied.

[0047] In FIG. 2, The first wireless device 100 and / or the second wireless device 200 may be implemented in various forms according to use cases / services. For example, {the first wireless device 100 and the second wireless device 200} may correspond to at least one of {the wireless device 100a to 100f and the BS 200}, {the wireless device 100a to 100f and the wireless device 100a to 100f} and / or {the BS 200 and the BS 200} of FIG. 1. The first wireless device 100 and / or the second wireless device 200 may be configured by various elements, devices / parts, and / or modules.

[0048] The first wireless device 100 may include at least one transceiver, such as a transceiver 106, at least one processing chip, such as a processing chip 101, and / or one or more antennas 108.

[0049] The processing chip 101 may include at least one processor, such a processor 102, and at least one memory, such as a memory 104. Additional and / or alternatively, the memory 104 may be placed outside of the processing chip 101.

[0050] The processor 102 may control the memory 104 and / or the transceiver 106 and may be adapted to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts described in the present disclosure. For example, the processor 102 may process information within the memory 104 to generate first information / signals and then transmit radio signals including the first information / signals through the transceiver 106. The processor 102 may receive radio signals including second information / signals through the transceiver 106 and then store information obtained by processing the second information / signals in the memory 104.

[0051] The memory 104 may be operably connectable to the processor 102. The memory 104 may store various types of information and / or instructions. The memory 104 may store a firmware and / or a software code 105 which implements codes, commands, and / or a set of commands that, when executed by the processor 102, perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. For example, the firmware and / or the software code 105 may implement instructions that, when executed by the processor 102, perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. For example, the firmware and / or the software code 105 may control the processor 102 to perform one or more protocols. For example, the firmware and / or the software code 105 may control the processor 102 to perform one or more layers of the radio interface protocol.

[0052] Herein, the processor 102 and the memory 104 may be a part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). The transceiver 106 may be connected to the processor 102 and transmit and / or receive radio signals through one or more antennas 108. Each of the transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be interchangeably used with Radio Frequency (RF) unit(s). In the present disclosure, the first wireless device 100 may represent a communication modem / circuit / chip.

[0053] The second wireless device 200 may include at least one transceiver, such as a transceiver 206, at least one processing chip, such as a processing chip 201, and / or one or more antennas 208.

[0054] The processing chip 201 may include at least one processor, such a processor 202, and at least one memory, such as a memory 204. Additional and / or alternatively, the memory 204 may be placed outside of the processing chip 201.

[0055] The processor 202 may control the memory 204 and / or the transceiver 206 and may be adapted to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts described in the present disclosure. For example, the processor 202 may process information within the memory 204 to generate third information / signals and then transmit radio signals including the third information / signals through the transceiver 206. The processor 202 may receive radio signals including fourth information / signals through the transceiver 106 and then store information obtained by processing the fourth information / signals in the memory 204.

[0056] The memory 204 may be operably connectable to the processor 202. The memory 204 may store various types of information and / or instructions. The memory 204 may store a firmware and / or a software code 205 which implements codes, commands, and / or a set of commands that, when executed by the processor 202, perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. For example, the firmware and / or the software code 205 may implement instructions that, when executed by the processor 202, perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. For example, the firmware and / or the software code 205 may control the processor 202 to perform one or more protocols. For example, the firmware and / or the software code 205 may control the processor 202 to perform one or more layers of the radio interface protocol.

[0057] Herein, the processor 202 and the memory 204 may be a part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and transmit and / or receive radio signals through one or more antennas 208. Each of the transceiver 206 may include a transmitter and / or a receiver. The transceiver 206 may be interchangeably used with RF unit. In the present disclosure, the second wireless device 200 may represent a communication modem / circuit / chip.

[0058] Hereinafter, hardware elements of the wireless devices 100 and 200 will be described more specifically. One or more protocol layers may be implemented by, without being limited to, one or more processors 102 and 202. For example, the one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as Physical (PHY) layer, Media Access Control (MAC) layer, Radio Link Control (RLC) layer, Packet Data Convergence Protocol (PDCP) layer, Radio Resource Control (RRC) layer, and Service Data Adaptation Protocol (SDAP) layer). The one or more processors 102 and 202 may generate one or more Protocol Data Units (PDUs), one or more Service Data Unit (SDUs), messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. The one or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure and provide the generated signals to the one or more transceivers 106 and 206. The one or more processors 102 and 202 may receive the signals (e.g., baseband signals) from the one or more transceivers 106 and 206 and acquire the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure.

[0059] The one or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. The one or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. As an example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in the one or more processors 102 and 202. For example, the one or more processors 102 and 202 may be configured by a set of a communication control processor, an Application Processor (AP), an Electronic Control Unit (ECU), a Central Processing Unit (CPU), a Graphic Processing Unit (GPU), and a memory control processor.

[0060] The one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, code, instructions, and / or commands. The one or more memories 104 and 204 may be configured by Random Access Memory (RAM), Dynamic RAM (DRAM), Read-Only Memory (ROM), electrically Erasable Programmable Read-Only Memory (EPROM), flash memory, volatile memory, non-volatile memory, hard drive, register, cash memory, computer-readable storage medium, and / or combinations thereof. The one or more memories 104 and 204 may be located at the interior and / or exterior of the one or more processors 102 and 202. The one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 through various technologies such as wired or wireless connection.

[0061] The one or more transceivers 106 and 206 may transmit user data, control information, and / or radio signals / channels, mentioned in the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure, to one or more other devices. The one or more transceivers 106 and 206 may receive user data, control information, and / or radio signals / channels, mentioned in the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure, from one or more other devices. For example, the one or more transceivers 106 and 206 may be connected to the one or more processors 102 and 202 and transmit and receive radio signals. For example, the one or more processors 102 and 202 may perform control so that the one or more transceivers 106 and 206 may transmit user data, control information, or radio signals to one or more other devices. The one or more processors 102 and 202 may perform control so that the one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices.

[0062] The one or more transceivers 106 and 206 may be connected to the one or more antennas 108 and 208. Additionally and / or alternatively, the one or more transceivers 106 and 206 may include one or more antennas 108 and 208. The one or more transceivers 106 and 206 may be adapted to transmit and receive user data, control information, and / or radio signals / channels, mentioned in the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure, through the one or more antennas 108 and 208. In the present disclosure, the one or more antennas 108 and 208 may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports).

[0063] The one or more transceivers 106 and 206 may convert received user data, control information, radio signals / channels, etc., from RF band signals into baseband signals in order to process received user data, control information, radio signals / channels, etc., using the one or more processors 102 and 202. The one or more transceivers 106 and 206 may convert the user data, control information, radio signals / channels, etc., processed using the one or more processors 102 and 202 from the base band signals into the RF band signals. To this end, the one or more transceivers 106 and 206 may include (analog) oscillators and / or filters. For example, the one or more transceivers 106 and 206 can up-convert OFDM baseband signals to OFDM signals by their (analog) oscillators and / or filters under the control of the one or more processors 102 and 202 and transmit the up-converted OFDM signals at the carrier frequency. The one or more transceivers 106 and 206 may receive OFDM signals at a carrier frequency and down-convert the OFDM signals into OFDM baseband signals by their (analog) oscillators and / or filters under the control of the one or more processors 102 and 202.

[0064] Although not shown in FIG. 2, the wireless devices 100 and 200 may further include additional components. The additional components 140 may be variously configured according to types of the wireless devices 100 and 200. For example, the additional components 140 may include at least one of a power unit / battery, an Input / Output (I / O) device (e.g., audio I / O port, video I / O port), a driving device, and a computing device. The additional components 140 may be coupled to the one or more processors 102 and 202 via various technologies, such as a wired or wireless connection.

[0065] In the implementations of the present disclosure, a UE may operate as a transmitting device in UL and as a receiving device in DL. In the implementations of the present disclosure, a BS may operate as a receiving device in UL and as a transmitting device in DL. Hereinafter, for convenience of description, it is mainly assumed that the first wireless device 100 acts as the UE, and the second wireless device 200 acts as the BS. For example, the processor(s) 102 connected to, mounted on or launched in the first wireless device 100 may be adapted to perform the UE behavior according to an implementation of the present disclosure or control the transceiver(s) 106 to perform the UE behavior according to an implementation of the present disclosure. The processor(s) 202 connected to, mounted on or launched in the second wireless device 200 may be adapted to perform the BS behavior according to an implementation of the present disclosure or control the transceiver(s) 206 to perform the BS behavior according to an implementation of the present disclosure.

[0066] In the present disclosure, a BS is also referred to as a node B (NB), an eNode B (eNB), or a gNB.

[0067] FIG. 3 shows an example of UE to which implementations of the present disclosure are applied.

[0068] Referring to FIG. 3, a UE 100 may correspond to the first wireless device 100 of FIG. 2.

[0069] A UE 100 includes a processor 102, a memory 104, a transceiver 106, one or more antennas 108, a power management module 141, a battery 142, a display 143, a keypad 144, a Subscriber Identification Module (SIM) card 145, a speaker 146, and a microphone 147.

[0070] The processor 102 may be adapted to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. The processor 102 may be adapted to control one or more other components of the UE 100 to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. Layers of the radio interface protocol may be implemented in the processor 102. The processor 102 may include ASIC, other chipset, logic circuit and / or data processing device. The processor 102 may be an application processor. The processor 102 may include at least one of DSP, CPU, GPU, a modem (modulator and demodulator). An example of the processor 102 may be found in SNAPDRAGONTMseries of processors made by QUALCOMM®, EXYNOSTMseries of processors made by SAMSUNG®, A series of processors made by APPLE®, HELIOTMseries of processors made by MEDIATEK®, ATOMTMseries of processors made by INTEL®or a corresponding next generation processor.

[0071] The memory 104 is operatively coupled with the processor 102 and stores a variety of information to operate the processor 102. The memory 104 may include ROM, RAM, flash memory, memory card, storage medium and / or other storage device. When the embodiments are implemented in software, the techniques described herein can be implemented with modules (e.g., procedures, functions, etc.) that perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. The modules can be stored in the memory 104 and executed by the processor 102. The memory 104 can be implemented within the processor 102 or external to the processor 102 in which case those can be communicatively coupled to the processor 102 via various means as is known in the art.

[0072] The transceiver 106 is operatively coupled with the processor 102, and transmits and / or receives a radio signal. The transceiver 106 includes a transmitter and a receiver. The transceiver 106 may include baseband circuitry to process radio frequency signals. The transceiver 106 controls the one or more antennas 108 to transmit and / or receive a radio signal.

[0073] The power management module 141 manages power for the processor 102 and / or the transceiver 106. The battery 142 supplies power to the power management module 141.

[0074] The display 143 outputs results processed by the processor 102. The keypad 144 receives inputs to be used by the processor 102. The keypad 144 may be shown on the display 143.

[0075] The SIM card 145 is an　integrated circuit　that is intended to　securely store the　International Mobile Subscriber Identity　(IMSI) number and its related　key, which are used to identify and authenticate subscribers on　mobile telephony　devices (such as　mobile phones　and　computers). It is also possible to store contact information on many SIM cards.

[0076] The speaker 146 outputs sound-related results processed by the processor 102. The microphone 147 receives sound-related inputs to be used by the processor 102.

[0077] FIGS. 4 and 5 show an example of protocol stacks in a 3GPP based wireless communication system to which implementations of the present disclosure are applied.

[0078] In particular, FIG. 4 illustrates an example of a radio interface user plane protocol stack between a UE and a BS and FIG. 5 illustrates an example of a radio interface control plane protocol stack between a UE and a BS. The control plane refers to a path through which control messages used to manage call by a UE and a network are transported. The user plane refers to a path through which data generated in an application layer, for example, voice data or Internet packet data are transported. Referring to FIG. 4, the user plane protocol stack may be divided into Layer 1 (i.e., a PHY layer) and Layer 2. Referring to FIG. 5, the control plane protocol stack may be divided into Layer 1 (i.e., a PHY layer), Layer 2, Layer 3 (e.g., an RRC layer), and a Non-Access Stratum (NAS) layer. Layer 1, Layer 2 and Layer 3 are referred to as an Access Stratum (AS).

[0079] In the 3GPP LTE system, the Layer 2 is split into the following sublayers: MAC, RLC, and PDCP. In the 3GPP NR system, the Layer 2 is split into the following sublayers: MAC, RLC, PDCP and SDAP. The PHY layer offers to the MAC sublayer transport channels, the MAC sublayer offers to the RLC sublayer logical channels, the RLC sublayer offers to the PDCP sublayer RLC channels, the PDCP sublayer offers to the SDAP sublayer radio bearers. The SDAP sublayer offers to 5G core network Quality of Service (QoS) flows.

[0080] In the 3GPP NR system, the main services and functions of the MAC sublayer include: mapping between logical channels and transport channels; multiplexing / de-multiplexing of MAC SDUs belonging to one or different logical channels into / from Transport Blocks (TB) delivered to / from the physical layer on transport channels; scheduling information reporting; error correction through Hybrid Automatic Repeat reQuest (HARQ) (one HARQ entity per cell in case of Carrier Aggregation (CA)); priority handling between UEs by means of dynamic scheduling; priority handling between logical channels of one UE by means of logical channel prioritization; padding. A single MAC entity may support multiple numerologies, transmission timings and cells. Mapping restrictions in logical channel prioritization control which numerology(ies), cell(s), and transmission timing(s) a logical channel can use.

[0081] Different kinds of data transfer services are offered by MAC. To accommodate different kinds of data transfer services, multiple types of logical channels are defined, i.e., each supporting transfer of a particular type of information. Each logical channel type is defined by what type of information is transferred. Logical channels are classified into two groups: control channels and traffic channels. Control channels are used for the transfer of control plane information only, and traffic channels are used for the transfer of user plane information only. Broadcast Control Channel (BCCH) is a downlink logical channel for broadcasting system control information, Paging Control Channel (PCCH) is a downlink logical channel that transfers paging information, system information change notifications and indications of ongoing Public Warning Service (PWS) broadcasts, Common Control Channel (CCCH) is a logical channel for transmitting control information between UEs and network and used for UEs having no RRC connection with the network, and Dedicated Control Channel (DCCH) is a point-to-point bi-directional logical channel that transmits dedicated control information between a UE and the network and used by UEs having an RRC connection. Dedicated Traffic Channel (DTCH) is a point-to-point logical channel, dedicated to one UE, for the transfer of user information. A DTCH can exist in both uplink and downlink. In downlink, the following connections between logical channels and transport channels exist: BCCH can be mapped to Broadcast Channel (BCH); BCCH can be mapped to Downlink Shared Channel (DL-SCH); PCCH can be mapped to Paging Channel (PCH); CCCH can be mapped to DL-SCH; DCCH can be mapped to DL-SCH; and DTCH can be mapped to DL-SCH. In uplink, the following connections between logical channels and transport channels exist: CCCH can be mapped to Uplink Shared Channel (UL-SCH); DCCH can be mapped to UL-SCH; and DTCH can be mapped to UL-SCH.

[0082] The RLC sublayer supports three transmission modes: Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). The RLC configuration is per logical channel with no dependency on numerologies and / or transmission durations. In the 3GPP NR system, the main services and functions of the RLC sublayer depend on the transmission mode and include: transfer of upper layer PDUs; sequence numbering independent of the one in PDCP (UM and AM); error correction through ARQ (AM only); segmentation (AM and UM) and re-segmentation (AM only) of RLC SDUs; reassembly of SDU (AM and UM); duplicate detection (AM only); RLC SDU discard (AM and UM); RLC re-establishment; protocol error detection (AM only).

[0083] In the 3GPP NR system, the main services and functions of the PDCP sublayer for the user plane include: sequence numbering; header compression and decompression using Robust Header Compression (ROHC); transfer of user data; reordering and duplicate detection; in-order delivery; PDCP PDU routing (in case of split bearers); retransmission of PDCP SDUs; ciphering, deciphering and integrity protection; PDCP SDU discard; PDCP re-establishment and data recovery for RLC AM; PDCP status reporting for RLC AM; duplication of PDCP PDUs and duplicate discard indication to lower layers. The main services and functions of the PDCP sublayer for the control plane include: sequence numbering; ciphering, deciphering and integrity protection; transfer of control plane data; reordering and duplicate detection; in-order delivery; duplication of PDCP PDUs and duplicate discard indication to lower layers.

[0084] In the 3GPP NR system, the main services and functions of SDAP include: mapping between a QoS flow and a data radio bearer; marking QoS Flow ID (QFI) in both DL and UL packets. A single protocol entity of SDAP is configured for each individual PDU session.

[0085] In the 3GPP NR system, the main services and functions of the RRC sublayer include: broadcast of system information related to AS and NAS; paging initiated by 5G Core network (5GC) or Next-Generation Radio Access Network (NG-RAN); establishment, maintenance and release of an RRC connection between the UE and NG-RAN; security functions including key management; establishment, configuration, maintenance and release of Signaling Radio Bearers (SRBs) and Data Radio Bearers (DRBs); mobility functions (including: handover and context transfer, UE cell selection and reselection and control of cell selection and reselection, inter-RAT mobility); QoS management functions; UE measurement reporting and control of the reporting; detection of and recovery from radio link failure; NAS message transfer to / from NAS from / to UE.

[0086] FIG. 6 shows a frame structure in a 3GPP based wireless communication system to which implementations of the present disclosure are applied.

[0087] The frame structure shown in FIG. 6 is purely exemplary and the number of subframes, the number of slots, and / or the number of symbols in a frame may be variously changed. In the 3GPP based wireless communication system, OFDM numerologies (e.g., SCS, Transmission Time Interval (TTI) duration) may be differently configured between a plurality of cells aggregated for one UE. For example, if a UE is configured with different SCSs for cells aggregated for the cell, an (absolute time) duration of a time resource (e.g., a subframe, a slot, or a TTI) including the same number of symbols may be different among the aggregated cells. Herein, symbols may include OFDM symbols (or Cyclic Prefix (CP)-OFDM symbols), SC-FDMA symbols (or Discrete Fourier Transform-spread-OFDM (DFT-s-OFDM) symbols).

[0088] Referring to FIG. 6, downlink and uplink transmissions are organized into frames. Each frame has Tf= 10ms duration. Each frame is divided into two half-frames, where each of the half-frames has 5ms duration. Each half-frame consists of 5 subframes, where the duration Tsfper subframe is 1ms. Each subframe is divided into slots and the number of slots in a subframe depends on a subcarrier spacing. Each slot includes 14 or 12 OFDM symbols based on a CP. In a normal CP, each slot includes 14 OFDM symbols and, in an extended CP, each slot includes 12 OFDM symbols. The numerology is based on exponentially scalable subcarrier spacing Δf = 2u*15 kHz.

[0089] Table 3 shows the number of OFDM symbols per slot Nslotsymb, the number of slots per frameNframe,uslot, and the number of slots per subframe Nsubframe,uslotfor the normal CP, according to the subcarrier spacing Δf = 2u*15 kHz.

[0090] uNslotsymbNframe,uslotNsubframe,uslot01410111420221440431480841416016

[0091] Table 4 shows the number of OFDM symbols per slot Nslotsymb, the number of slots per frameNframe,uslot, and the number of slots per subframe Nsubframe,uslotfor the extended CP, according to the subcarrier spacing Δf = 2u*15 kHz.

[0092] uNslotsymbNframe,uslotNsubframe,uslot212404

[0093] A slot includes plural symbols (e.g., 14 or 12 symbols) in the time domain. For each numerology (e.g., subcarrier spacing) and carrier, a resource grid ofNsize,ugrid,x*NRBscsubcarriers andNsubframe,usymbOFDM symbols is defined, starting at Common Resource Block (CRB)Nstart,ugridindicated by higher-layer signaling (e.g., RRC signaling), whereNsize,ugrid,xis the number of Resource Blocks (RBs) in the resource grid and the subscript x is DL for downlink and UL for uplink.NRBscis the number of subcarriers per RB. In the 3GPP based wireless communication system,NRBscis 12 generally. There is one resource grid for a given antenna portp, subcarrier spacing configurationu, and transmission direction (DL or UL). The carrier bandwidthNsize,ugridfor subcarrier spacing configurationuis given by the higher-layer parameter (e.g., RRC parameter). Each element in the resource grid for the antenna portpand the subcarrier spacing configurationuis referred to as a Resource Element (RE) and one complex symbol may be mapped to each RE. Each RE in the resource grid is uniquely identified by an indexkin the frequency domain and an indexlrepresenting a symbol location relative to a reference point in the time domain. In the 3GPP based wireless communication system, an RB is defined by 12 consecutive subcarriers in the frequency domain.

[0094] In the 3GPP NR system, RBs are classified into CRBs and Physical Resource Blocks (PRBs). CRBs are numbered from 0 and upwards in the frequency domain for subcarrier spacing configurationu. The center of subcarrier 0 of CRB 0 for subcarrier spacing configurationucoincides with 'point A' which serves as a common reference point for resource block grids. In the 3GPP NR system, PRBs are defined within a BandWidth Part (BWP) and numbered from 0 toNsizeBWP,i-1, where i is the number of the bandwidth part. The relation between the physical resource block nPRBin the bandwidth part i and the common resource block nCRBis as follows: nPRB= nCRB+NsizeBWP,i, whereNsizeBWP,iis the common resource block where bandwidth part starts relative to CRB 0. The BWP includes a plurality of consecutive RBs. A carrier may include a maximum of N (e.g., 5) BWPs. A UE may be configured with one or more BWPs on a given component carrier. Only one BWP among BWPs configured to the UE can active at a time. The active BWP defines the UE's operating bandwidth within the cell's operating bandwidth.

[0095] In the present disclosure, the term "cell" may refer to a geographic area to which one or more nodes provide a communication system, or refer to radio resources. A "cell" as a geographic area may be understood as coverage within which a node can provide service using a carrier and a "cell" as radio resources (e.g., time-frequency resources) is associated with bandwidth which is a frequency range configured by the carrier. The "cell" associated with the radio resources is defined by a combination of downlink resources and uplink resources, for example, a combination of a DL Component Carrier (CC) and a UL CC. The cell may be configured by downlink resources only, or may be configured by downlink resources and uplink resources. Since DL coverage, which is a range within which the node is capable of transmitting a valid signal, and UL coverage, which is a range within which the node is capable of receiving the valid signal from the UE, depends upon a carrier carrying the signal, the coverage of the node may be associated with coverage of the "cell" of radio resources used by the node. Accordingly, the term "cell" may be used to represent service coverage of the node sometimes, radio resources at other times, or a range that signals using the radio resources can reach with valid strength at other times.

[0096] In CA, two or more CCs are aggregated. A UE may simultaneously receive or transmit on one or multiple CCs depending on its capabilities. CA is supported for both contiguous and non-contiguous CCs. When CA is configured, the UE only has one RRC connection with the network. At RRC connection establishment / re-establishment / handover, one serving cell provides the NAS mobility information, and at RRC connection re-establishment / handover, one serving cell provides the security input. This cell is referred to as the Primary Cell (PCell). The PCell is a cell, operating on the primary frequency, in which the UE either performs the initial connection establishment procedure or initiates the connection re-establishment procedure. Depending on UE capabilities, Secondary Cells (SCells) can be configured to form together with the PCell a set of serving cells. An SCell is a cell providing additional radio resources on top of Special Cell (SpCell). The configured set of serving cells for a UE therefore always consists of one PCell and one or more SCells. For Dual Connectivity (DC) operation, the term SpCell refers to the PCell of the Master Cell Group (MCG) or the Primary SCell (PSCell) of the Secondary Cell Group (SCG). An SpCell supports Physical Uplink Control Channel (PUCCH) transmission and contention-based random access, and is always activated. The MCG is a group of serving cells associated with a master node, comprised of the SpCell (PCell) and optionally one or more SCells. The SCG is the subset of serving cells associated with a secondary node, comprised of the PSCell and zero or more SCells, for a UE configured with DC. For a UE in RRC_CONNECTED not configured with CA / DC, there is only one serving cell comprised of the PCell. For a UE in RRC_CONNECTED configured with CA / DC, the term "serving cells" is used to denote the set of cells comprised of the SpCell(s) and all SCells. In DC, two MAC entities are configured in a UE: one for the MCG and one for the SCG.

[0097] FIG. 7 shows a data flow example in the 3GPP NR system to which implementations of the present disclosure are applied.

[0098] Referring to FIG. 7, "RB" denotes a radio bearer, and "H" denotes a header. Radio bearers are categorized into two groups: DRBs for user plane data and SRBs for control plane data. The MAC PDU is transmitted / received using radio resources through the PHY layer to / from an external device. The MAC PDU arrives to the PHY layer in the form of a transport block.

[0099] In the PHY layer, the uplink transport channels UL-SCH and Random Access Channel (RACH) are mapped to their physical channels Physical Uplink Shared Channel (PUSCH) and Physical Random Access Channel (PRACH), respectively, and the downlink transport channels DL-SCH, BCH and PCH are mapped to Physical Downlink Shared Channel (PDSCH), Physical Broadcast Channel (PBCH) and PDSCH, respectively. In the PHY layer, Uplink Control Information (UCI) is mapped to PUCCH, and Downlink Control Information (DCI) is mapped to Physical Downlink Control Channel (PDCCH). A MAC PDU related to UL-SCH is transmitted by a UE via a PUSCH based on an UL grant, and a MAC PDU related to DL-SCH is transmitted by a BS via a PDSCH based on a DL assignment.

[0100] The Random Access procedure is initiated by a PDCCH order, by the MAC entity itself, or by RRC. There is only one Random Access procedure ongoing at any point in time in a MAC entity. The Random Access procedure on an SCell or an L1L2-Triggered Mobility (LTM) candidate cell shall only be initiated by a PDCCH order withra-PreambleIndexdifferent from 0b000000.

[0101] When a Random Access procedure is initiated, UE selects a set of Random Access resources as specified in clause 5.1.1b and initializes the following parameters for the Random Access procedure according to the values configured by RRC for the selected set of random access resources:

[0102] -prach-ConfigurationIndex: the available set of PRACH occasions for the transmission of the Random Access Preamble for Msg1. These are also applicable to the MSGA PRACH if the PRACH occasions are shared between 2-step and 4-step RA types;

[0103] -msgA-PRACH-ConfigurationIndex: the available set of PRACH occasions for the transmission of the Random Access Preamble for MSGA in 2-step RA type;

[0104] -preambleReceivedTargetPower: initial Random Access Preamble power for 4-step RA type;

[0105] -msgA-PreambleReceivedTargetPower: initial Random Access Preamble power for 2-step RA type;

[0106] -rsrp-ThresholdSSB: an Reference Signal Received Power (RSRP) threshold for the selection of the Synchronization Signal block (SSB) for 4-step RA type. If the Random Access procedure is initiated for beam failure recovery,rsrp-ThresholdSSBused for the selection of the SSB withincandidateBeamRSListrefers torsrp-ThresholdSSBinBeamFailureRecoveryConfigIE;

[0107] -rsrp-ThresholdCSI-RS: an RSRP threshold for the selection of Channel State Information Reference Signal (CSI-RS) for 4-step RA type. If the Random Access procedure is initiated for beam failure recovery,rsrp-ThresholdCSI-RSis equal torsrp-ThresholdSSBinBeamFailureRecoveryConfigIE;

[0108] -msgA-RSRP-ThresholdSSB: an RSRP threshold for the selection of the SSB for 2-step RA type;

[0109] -rsrp-ThresholdSSB-SUL: an RSRP threshold for the selection between the Normal UL (NUL) carrier and the Supplementary UL (SUL) carrier;

[0110] -msgA-RSRP-Threshold: an RSRP threshold for selection between 2-step RA type and 4-step RA type when both 2-step and 4-step RA type Random Access Resources are configured in the UL BWP;

[0111] -rsrp-ThresholdMsg1-RepetitionNum2: an RSRP threshold for Msg1 repetition with repetition number 2;

[0112] -rsrp-ThresholdMsg1-RepetitionNum4: an RSRP threshold for Msg1 repetition with repetition number 4;

[0113] -rsrp-ThresholdMsg1-RepetitionNum8: an RSRP threshold for Msg1 repetition with repetition number 8;

[0114] -rsrp-ThresholdMsg3: an RSRP threshold for Msg3 repetition;

[0115] -FeatureCombination: feature or a combination of features associated with a set of Random Access resources;

[0116] -featurePriorities: priorities for features, such as (e)RedCap, Slicing, etc.;

[0117] -msgA-TransMax: The maximum number of MSGA transmissions when both 4-step and 2-step RA type Random Access Resources are configured;

[0118] -candidateBeamRSList: a list of reference signals (CSI-RS and / or SSB) identifying the candidate beams for recovery and the associated Random Access parameters;

[0119] -recoverySearchSpaceId: the search space identity for monitoring the response of the beam failure recovery request;

[0120] -powerRampingStep: the power-ramping factor;

[0121] -msgA-PreamblePowerRampingStep: the power ramping factor for MSGA preamble;

[0122] -powerRampingStepHighPriority: the power-ramping factor in case of prioritized Random Access procedure;

[0123] -scalingFactorBI: a scaling factor for prioritized Random Access procedure;

[0124] -ra-PreambleIndex: Random Access Preamble;

[0125] -ra-ssb-OccasionMaskIndex: defines PRACH occasion(s) associated with an SSB in which the MAC entity may transmit a Random Access Preamble;

[0126] -msgA-SSB-SharedRO-MaskIndex: Indicates the subset of 4-step RA type PRACH occasions shared with 2-step RA type PRACH occasions for each SSB. If 2-step RA type PRACH occasions are shared with 4-step RA type PRACH occasions andmsgA-SSB-SharedRO-MaskIndexis not configured, then all 4-step RA type PRACH occasions are available for 2-step RA type;

[0127] -ssb-SharedRO-MaskIndex: defines PRACH occasions, on which preambles are allocated for a feature or a combination of features, associated with an SSB in which the MAC entity may transmit a Random Access Preamble;

[0128] -ra-OccasionList: defines PRACH occasion(s) associated with a CSI-RS in which the MAC entity may transmit a Random Access Preamble;

[0129] -ra-PreambleStartIndex: the starting index of Random Access Preamble(s) for on-demand System Information (SI) request;

[0130] -startPreambleForThisPartition: the first preamble associated with the set of Random Access Resources applicable to the Random Access procedure;

[0131] -preambleTransMax: the maximum number of Random Access Preamble transmission;

[0132] -preambleTransMax-Msg1-Repetition: the maximum number of Random Access Preamble transmissions with a given Msg1 repetition number before switching to Msg1 repetition with the next available higher Msg1 repetition number;

[0133] -ssb-perRACH-OccasionAndCB-PreamblesPerSSB: defines the number of SSBs mapped to each PRACH occasion for 4-step RA type and the number of contention-based Random Access Preambles mapped to each SSB;

[0134] -msgA-CB-PreamblesPerSSB-PerSharedRO: defines the number of contention-based Random Access Preambles for 2-step RA type mapped to each SSB when the PRACH occasions are shared between 2-step and 4-step RA types;

[0135] -msgA-SSB-PerRACH-OccasionAndCB-PreamblesPerSSB: defines the number of SSBs mapped to each PRACH occasion for 2-step RA type and the number of contention-based Random Access Preambles mapped to each SSB;

[0136] -numberOfPreamblesPerSSB-ForThisPartition: defines the number ofconsecutive preambles for a feature or a combination of features mapped to each SSB;

[0137] -msgA-PUSCH-ResourceGroupA: defines MSGA PUSCH resources that the UE shall use when performing MSGA transmission using Random Access Preambles group A;

[0138] -msgA-PUSCH-ResourceGroupB: defines MSGA PUSCH resources that the UE shall use when performing MSGA transmission using Random Access Preambles group B;

[0139] -msgA-PUSCH-Resource-Index: identifies the index of the PUSCH resource used for MSGA in case of contention-free Random Access with 2-step RA type;

[0140] - ifgroupBconfiguredis configured, then Random Access Preambles group B is configured for 4-step RA type.

[0141] -> Amongst the contention-based Random Access Preambles associated with an SSB, the firstnumberOfRA-PreamblesGroupAincluded ingroupBconfiguredRandom Access Preambles belong to Random Access Preambles group A. The remaining Random Access Preambles associated with the SSB belong to Random Access Preambles group B (if configured).

[0142] - ifgroupB-ConfiguredTwoStepRAis configured, then Random Access Preambles group B is configured for 2-step RA type.

[0143] -> Amongst the contention-based Random Access Preambles for 2-step RA type associated with an SSB, the firstnumberOfRA-PreamblesGroupAincluded inGroupB-ConfiguredTwoStepRARandom Access Preambles belong to Random Access Preambles group A. The remaining Random Access Preambles associated with the SSB belong to Random Access Preambles group B (if configured).

[0144] - if Random Access Preambles group B is configured for 4-step RA type:

[0145] ->ra-Msg3SizeGroupA: the threshold to determine the groups of Random Access Preambles for 4-step RA type;

[0146] ->msg3-DeltaPreamble;

[0147] ->messagePowerOffsetGroupB: the power offset for preamble selection included ingroupBconfigured;

[0148] ->numberOfRA-PreamblesGroupA: defines the number of Random Access Preambles in Random Access Preamble group A for each SSB included ingroupBconfigured.

[0149] - if Random Access Preambles group B is configured for 2-step RA type:

[0150] ->msgA-DeltaPreamble;

[0151] ->messagePowerOffsetGroupB: the power offset for preamble selection included inGroupB-ConfiguredTwoStepRA;

[0152] ->numberOfRA-PreamblesGroupA: defines the number of Random Access Preambles in Random Access Preamble group A for each SSB included inGroupB-ConfiguredTwoStepRA;

[0153] ->ra-MsgA-SizeGroupA: the threshold to determine the groups of Random Access Preambles for 2-step RA type.

[0154] - the set of Random Access Preambles and / or PRACH occasions for SI request, if any;

[0155] - the set of Random Access Preambles and / or PRACH occasions for beam failure recovery request, if any;

[0156] - the set of Random Access Preambles and / or PRACH occasions for reconfiguration with sync, if any;

[0157] -ra-ResponseWindow: the time window to monitor RA response(s) (SpCell only);

[0158] -ra-ContentionResolutionTimer: the Contention Resolution Timer (SpCell only);

[0159] -msgB-ResponseWindow: the time window to monitor RA response(s) for 2-step RA type (SpCell only).

[0160] When the Random Access procedure is initiated on a Serving Cell, the MAC entity shall:

[0161] 1> select the set of Random Access resources applicable to the current Random Access procedure;

[0162] 1> if the Random Access procedure is initiated by PDCCH order and if thera-PreambleIndexexplicitly provided by PDCCH is not 0b000000; or

[0163] 1> if the Random Access procedure was initiated for SI request and the Random Access Resources for SI request have been explicitly provided by RRC; or

[0164] 1> if the Random Access procedure was initiated for SpCell beam failure recovery and if the contention-free Random Access Resources for beam failure recovery request for 4-step RA type have been explicitly provided by RRC for the BWP selected for Random Access procedure; or

[0165] 1> if the Random Access procedure was initiated for reconfiguration with sync and if the contention-free Random Access Resources for 4-step RA type have been explicitly provided inrach-ConfigDedicatedfor the BWP selected for Random Access procedure; or

[0166] 1> if the Random Access procedure was initiated for LTM cell switch and if the contention-free Random Access Resources have been explicitly provided in LTM Cell Switch Command MAC CE:

[0167] 2> set theRA_TYPEto4-stepRA.

[0168] 1> else if the BWP selected for Random Access procedure is configured with both 2-step and 4-step RA type Random Access Resources within the selected set of Random Access resources and the RSRP of the downlink pathloss reference is abovemsgA-RSRP-Threshold; or

[0169] 1> if the BWP selected for Random Access procedure is only configured with 2-step RA type Random Access resources within the selected set of Random Access resources; or

[0170] 1> if the Random Access procedure was initiated for reconfiguration with sync and if the contention-free Random Access Resources for 2-step RA type have been explicitly provided inrach-ConfigDedicatedfor the BWP selected for Random Access procedure:

[0171] 2> set theRA_TYPEto2-stepRA.

[0172] 1> else:

[0173] 2> set theRA_TYPEto4-stepRA.

[0174] 1> perform initialization of variables specific to Random Access type;

[0175] 1> ifRA_TYPEis set to2-stepRA:

[0176] 2> perform the Random Access Resource selection procedure for 2-step RA type.

[0177] 1> else:

[0178] 2> perform the Random Access Resource selection procedure.

[0179] For selection of the set of Random Access resources for the Random Access procedure, the MAC entity shall:

[0180] 1> if the BWP selected for Random Access procedure is configured with both set(s) of Random Access resources withmsg3-Repetitionsset totrueand set(s) of Random Access resources withoutmsg3-Repetitionsset totrueand the RSRP of the downlink pathloss reference is less thanrsrp-ThresholdMsg3; or

[0181] 1> if the BWP selected for Random Access procedure is only configured with the set(s) of Random Access resources withmsg3-Repetitionsset totrue:

[0182] 2> assume Msg3 repetition is applicable for the current Random Access procedure.

[0183] 1> else:

[0184] 2> assume Msg3 repetition is not applicable for the current Random Access procedure.

[0185] 1> if contention-free Random Access Resources have been provided for this Random Access procedure and a Msg1 repetition number is indicated inrach-ConfigDedicated:

[0186] 2> assume Msg1 repetition is applicable and Msg1 repetition number applicable for the current Random Access procedure is the Msg1 repetition number indicated inrach-ConfigDedicated.

[0187] 1> else if contention free Random Access Resources have not been provided for this Random Access procedure and the BWP selected for the Random Access procedure is configured with set(s) of Random Access resources withmsg1-Repetitionsset totrueand set(s) of Random Access resources withoutmsg1-Repetitionsset totrue:

[0188] 2> if the BWP selected for the Random Access procedure is configured with set(s) of Random Access resources associated with Msg1 repetition number 8 and the RSRP of the downlink pathloss reference is less thanrsrp-ThresholdMsg1-RepetitionNum8:

[0189] 3> assume Msg1 repetition is applicable and Msg1 repetition number applicable for the current Random Access procedure includes 8.

[0190] 2> if the BWP selected for the Random Access procedure is configured with set(s) of Random Access resources associated with Msg1 repetition number 4 and the RSRP of the downlink pathloss reference is less thanrsrp-ThresholdMsg1-RepetitionNum4:

[0191] 3> assume Msg1 repetition is applicable and Msg1 repetition number applicable for the current Random Access procedure includes 4.

[0192] 2> if the BWP selected for the Random Access procedure is configured with set(s) of Random Access resources associated with Msg1 repetition number 2 and the RSRP of the downlink pathloss reference is less thanrsrp-ThresholdMsg1-RepetitionNum2:

[0193] 3> assume Msg1 repetition is applicable and Msg1 repetition number applicable for the current Random Access procedure includes 2.

[0194] 2> else if the RSRP of the downlink pathloss reference is not less than any configuredrsrp-ThresholdMsg1-RepetitionNumX:

[0195] 3> assume Msg1 repetition is not applicable for the current Random Access procedure.

[0196] 1> else ifthe BWP selected for Random Access procedure is configured only with Random Access resources withmsg1-Repetitionsset totrue:

[0197] 2> assume Msg1 repetition is applicable for the current Random Access procedure;

[0198] 2> if at least one ofrsrp-ThresholdMsg1-RepetitionNumXis configured:

[0199] 3> ifrsrp-ThresholdMsg1-RepetitionNum8is configured and the RSRP of the downlink pathloss reference is less thanrsrp-ThresholdMsg1-RepetitionNum8;

[0200] 4> assume Msg1 repetition number applicable for the current Random Access procedure includes 8.

[0201] 3> ifrsrp-ThresholdMsg1-RepetitionNum4is configured and the RSRP of the downlink pathloss reference is less thanrsrp-ThresholdMsg1-RepetitionNum4:

[0202] 4> assume Msg1 repetition number applicable for the current Random Access procedure includes 4.

[0203] 3> ifrsrp-ThresholdMsg1-RepetitionNum2is configured and the RSRP of the downlink pathloss reference is less thanrsrp-ThresholdMsg1-RepetitionNum2:

[0204] 4> assume Msg1 repetition number applicable for the current Random Access procedure includes 2.

[0205] 3> else if the RSRP of the downlink pathloss reference is not less than any configuredrsrp-ThresholdMsg1-RepetitionNumX:

[0206] 4> assume Msg1 repetition number applicable for the current Random Access procedure is the lowest Msg1 repetition number configured for this BWP.

[0207] 2> else (none ofrsrp-ThresholdMsg1-RepetitionNumXis configured):

[0208] 3> assume Msg1 repetition number applicable for the current Random Access procedure is the Msg1 repetition number that configured for this BWP.

[0209] 1> if neither contention-free Random Access Resources nor Random Access Resources for SI request have been provided for this Random Access procedure and one or more of the features including (e)RedCap and / or Slicing and / or Small Data Transmission (SDT) and / or MSG3 repetition and / or MSG1 repetition is applicable for this Random Access procedure:

[0210] 2> if none of the sets of Random Access resources are available for any feature applicable to the current Random Access procedure:

[0211] 3> select the set(s) of Random Access resources that are not associated with any feature indication for this Random Access procedure.

[0212] 2> else if there is one set of Random Access resources available which can be used for indicating all features triggering this Random Access procedure:

[0213] 3> select this set of Random Access resources for this Random Access procedure.

[0214] 2> else if there are more than one set of Random Access resources available which can be used for indicating all features triggering this Random Access procedure and Msg1 repetition is applicable for this Random Access procedure:

[0215] 3> select the set of Random Access resources that associated with highest repetition number among the sets of Random Access resources.

[0216] 2> else (i.e. there are one or more sets of Random Access resources available that are configured with indication(s) for a subset of all features triggering this Random Access procedure):

[0217] 3> select a set of Random Access resources from the available set(s) of Random Access resources based on the priority order indicated by upper layers for this Random Access Procedure.

[0218] 1> else if contention-free Random Access Resources with Msg1 repetition have been provided for this Random Access procedure and Msg1 repetition number is indicated inrach-ConfigDedicated, and RedCap is applicable for the current Random Access procedure:

[0219] 2> select the set of Random Access resources that is only configured with RedCap indication and Msg1 repetition indication and associated with the indicated Msg1 repetition number for this Random Access procedure.

[0220] 1> else if contention-free Random Access Resources with Msg1 repetition have been provided for this Random Access procedure and Msg1 repetition number is indicated inrach-ConfigDedicated, and eRedCap is applicable for the current Random Access procedure:

[0221] 2> select the set of Random Access resources that is only configured with eRedCap indication and Msg1 repetition indication and associated with the indicated Msg1 repetition number for this Random Access procedure.

[0222] 1> else if contention-free Random Access Resources have been provided for this Random Access procedure and RedCap is applicable for the current Random Access procedure and there is one set of Random Access resources available that is only configured with RedCap indication; or

[0223] 1> if contention-free Random Access Resources have been provided for this Random Access procedure and eRedCap is applicable for the current Random Access procedure and there is one set of Random Access resources available that is only configured with eRedCap indication; or

[0224] 1> if contention-free Random Access Resources have been provided for this Random Access procedure and eRedCap is applicable for the current Random Access procedure and there is no set of Random Access resources available that is only configured with eRedCap indication and there is one set of Random Access resources available that is only configured with RedCap indication:

[0225] 2> select this set of Random Access resources for this Random Access procedure.

[0226] 1> else:

[0227] 2> if the Random Access procedure is initiated by PDCCH order with DCIPRACH association indicatorfield set to 1 andSSB-MTC-AdditionalPCIis configured by upper layers:

[0228] 3> select the set of Random Access resources corresponding to the activeadditionalPCI.

[0229] 2> else if the Random Access procedure is initiated by PDCCH order for an LTM candidate cell:

[0230] 3> select the set of Random Access resources corresponding to the fieldCell indicatorin PDCCH order.

[0231] 2> else if contention-free Random Access Resources with Msg1 repetition have been provided for this Random Access procedure, and Msg1 repetition number is indicated inrach-ConfigDedicated:

[0232] 3> select the set of Random Access resources that is only configured with Msg1 repetition indication and associated with the indicated Msg1 repetition number for this Random Access procedure.

[0233] 2> else if the Random Access procedure was initiated for SI request and Random Access Resources associated with Msg1 repetition for SI request and Msg1 repetition number have been provided for this Random Access procedure:

[0234] 3> select the set of Random Access resources that is only configured with Msg1 repetition indication and associated with the indicated Msg1 repetition number for this Random Access procedure.

[0235] 2> else:

[0236] 3> select the set of Random Access resources that are not associated with any feature indication for the current Random Access procedure.

[0237] For Random Access Resource selection, if the selectedRA_TYPEis set to4-stepRA, the MAC entity shall:

[0238] 1> if the Random Access procedure was initiated for SpCell beam failure recovery; and

[0239] 1> if thebeamFailureRecoveryTimeris either running or not configured; and

[0240] 1> if the contention-free Random Access Resources for beam failure recovery request associated with any of the SSBs and / or CSI-RSs have been explicitly provided by RRC; and

[0241] 1> if at least one of the SSBs with SS-RSRP aboversrp-ThresholdSSBamongst the SSBs incandidateBeamRSListor the CSI-RSs with CSI-RSRP aboversrp-ThresholdCSI-RSamongst the CSI-RSs incandidateBeamRSListis available:

[0242] 2> select an SSB with SS-RSRP aboversrp-ThresholdSSBamongst the SSBs incandidateBeamRSListor a CSI-RS with CSI-RSRP aboversrp-ThresholdCSI-RSamongst the CSI-RSs incandidateBeamRSList;

[0243] 2> if CSI-RS is selected, and there is nora-PreambleIndexassociated with the selected CSI-RS:

[0244] 3> set thePREAMBLE_INDEXto ara-PreambleIndexcorresponding to the SSB incandidateBeamRSListwhich is quasi-colocated with the selected CSI-RS.

[0245] 2> else:

[0246] 3> set thePREAMBLE_INDEXto ara-PreambleIndexcorresponding to the selected SSB or CSI-RS from the set of Random Access Preambles for beam failure recovery request.

[0247] 1> else if thera-PreambleIndexhas been explicitly provided by PDCCH; and

[0248] 1> if thera-PreambleIndexis not 0b000000:

[0249] 2> set thePREAMBLE_INDEXto the signalledra-PreambleIndex;

[0250] 2> select the SSB signalled by PDCCH.

[0251] 1> else if thera-PreambleIndexhas been explicitly provided by an LTM Cell Switch Command MAC CE and the signalled SSB with SS-RSRP aboversrp-ThresholdSSBis available:

[0252] 2> set thePREAMBLE_INDEXto the signalledra-PreambleIndex;

[0253] 2> select the SSB signalled by the LTM Cell Switch Command MAC CE.

[0254] 1> else if the contention-free Random Access Resources associated with SSBs have been explicitly provided inrach-ConfigDedicatedand at least one SSB with SS-RSRP aboversrp-ThresholdSSBamongst the associated SSBs is available:

[0255] 2> select an SSB with SS-RSRP aboversrp-ThresholdSSBamongst the associated SSBs;

[0256] 2> set thePREAMBLE_INDEXto ara-PreambleIndexcorresponding to the selected SSB.

[0257] 1> else if the contention-free Random Access Resources associated with CSI-RSs have been explicitly provided inrach-ConfigDedicatedand at least one CSI-RS with CSI-RSRP aboversrp-ThresholdCSI-RSamongst the associated CSI-RSs is available:

[0258] 2> select a CSI-RS with CSI-RSRP aboversrp-ThresholdCSI-RSamongst the associated CSI-RSs;

[0259] 2> set thePREAMBLE_INDEXto ara-PreambleIndexcorresponding to the selected CSI-RS.

[0260] 1> else if the Random Access procedure was initiated for SI request; and

[0261] 1> if the Random Access Resources for SI request have been explicitly provided by RRC:

[0262] 2> if at least one of the SSBs with SS-RSRP aboversrp-ThresholdSSBis available:

[0263] 3> select an SSB with SS-RSRP aboversrp-ThresholdSSB.

[0264] 2> else:

[0265] 3> select any SSB.

[0266] 2> select a Random Access Preamble corresponding to the selected SSB, from the Random Access Preamble(s) determined according tora-PreambleStartIndex;

[0267] 2> set thePREAMBLE_INDEXto selected Random Access Preamble.

[0268] 1> else (i.e. for the contention-based Random Access preamble selection):

[0269] 2> if at least one of the SSBs with SS-RSRP aboversrp-ThresholdSSBis available:

[0270] 3> select an SSB with SS-RSRP aboversrp-ThresholdSSB.

[0271] 2> else:

[0272] 3> select any SSB.

[0273] 2> if theRA_TYPEis switched from2-stepRAto4-stepRA:

[0274] 3> if a Random Access Preambles group was selected during the current Random Access procedure:

[0275] 4> select the same group of Random Access Preambles as was selected for the 2-step RA type.

[0276] 3> else:

[0277] 4> if Random Access Preambles group B is configured; and

[0278] 4> if the transport block size of the MSGA payload configured in therach-ConfigDedicatedcorresponds to the transport block size of the MSGA payload associated with Random Access Preambles group B:

[0279] 5> select the Random Access Preambles group B.

[0280] 4> else:

[0281] 5> select the Random Access Preambles group A.

[0282] 2> else if Msg3 buffer is empty:

[0283] 3> if Random Access Preambles group B is configured:

[0284] 4> if the potential Msg3 size (UL data available for transmission plus MAC subheader(s) and, where required, MAC CEs) is greater thanra-Msg3SizeGroupAand the pathloss is less thanPCMAX(of the Serving Cell performing the Random Access Procedure) -preambleReceivedTargetPower-msg3-DeltaPreamble-messagePowerOffsetGroupB; or

[0285] 4> if the Random Access procedure was initiated for the CCCH logical channel and the CCCH SDU size plus MAC subheader is greater thanra-Msg3SizeGroupA:

[0286] 5> select the Random Access Preambles group B.

[0287] 4> else:

[0288] 5> select the Random Access Preambles group A.

[0289] 3> else:

[0290] 4> select the Random Access Preambles group A.

[0291] 2> else (i.e. Msg3 is being retransmitted):

[0292] 3> select the same group of Random Access Preambles as was used for the Random Access Preamble transmission attempt corresponding to the first transmission of Msg3.

[0293] 2> select a Random Access Preamble randomly with equal probability from the Random Access Preambles associated with the selected SSB and the selected Random Access Preambles group;

[0294] 2> set thePREAMBLE_INDEXto the selected Random Access Preamble.

[0295] 1> if the Random Access procedure was initiated for SI request; and

[0296] 1> ifra-AssociationPeriodIndexandsi-RequestPeriodare configured:

[0297] 2> determine the next available PRACH occasion from the PRACH occasions corresponding to the selected SSB in the association period given byra-AssociationPeriodIndexin thesi-RequestPeriodpermitted by the restrictions given by thera-ssb-OccasionMaskIndexif configured (the MAC entity shall select a PRACH occasion randomly with equal probability amongst the consecutive PRACH occasions corresponding to the selected SSB).

[0298] 1> else if an SSB is selected above:

[0299] 2> if the set of Random Access resources associated with Msg1 repetition is selected for this Random Access procedure:

[0300] 3> determine the next available set of PRACH occasions for the Msg1 repetition number applicable for this Random Access procedure corresponding to the selected SSB, permitted by the restrictions given by thera-ssb-OccasionMaskIndexif configured, orssb-SharedRO-MaskIndexif configured (the MAC entity shall select a set of PRACH occasions randomly with equal probability amongst sets of PRACH occasions regardless the FR2 UL gap, corresponding to the selected SSB and selected Msg1 repetition number for this Random Access procedure; the MAC entity may take into account the possible occurrence of measurement gaps and Multi-USIM (MUSIM) gaps when determining the next available set of PRACH occasions corresponding to the selected SSB).

[0301] 2> else:

[0302] 3> determine the next available PRACH occasion from the PRACH occasions corresponding to the selected SSB permitted by the restrictions given by thera-ssb-OccasionMaskIndexif configured, orssb-SharedRO-MaskIndexif configured, or indicated by PDCCH, or indicated by the LTM Cell Switch Command MAC CE (the MAC entity shall select a PRACH occasion randomly with equal probability amongst the consecutive PRACH occasions regardless the FR2 UL gap, corresponding to the selected SSB; the MAC entity may take into account the possible occurrence of measurement gaps and MUSIM gaps when determining the next available PRACH occasion corresponding to the selected SSB).

[0303] 1> else if a CSI-RS is selected above:

[0304] 2> if there is no contention-free Random Access Resource associated with the selected CSI-RS:

[0305] 3> determine the next available PRACH occasion from the PRACH occasions, permitted by the restrictions given by thera-ssb-OccasionMaskIndexif configured, corresponding to the SSB incandidateBeamRSListwhich is quasi-colocated with the selected CSI-RS (the MAC entity shall select a PRACH occasion randomly with equal probability amongst the consecutive PRACH occasions regardless the FR2 UL gap, corresponding to the SSB which is quasi-colocated with the selected CSI-RS; the MAC entity may take into account the possible occurrence of measurement gaps and MUSIM gaps when determining the next available PRACH occasion corresponding to the SSB which is quasi-colocated with the selected CSI-RS).

[0306] 2> else:

[0307] 3> determine the next available PRACH occasion from the PRACH occasions inra-OccasionListcorresponding to the selected CSI-RS (the MAC entity shall select a PRACH occasion randomly with equal probability amongst the PRACH occasions occurring simultaneously but on different subcarriers regardless the FR2 UL gap, corresponding to the selected CSI-RS; the MAC entity may take into account the possible occurrence of measurement gaps and MUSIM gaps when determining the next available PRACH occasion corresponding to the selected CSI-RS).

[0308] 1> perform the Random Access Preamble transmission procedure.

[0309] As mentioned above, when a cell operates multiple beams, random access resource may be associated with beam. Therefore, when the UE performs random access procedure, the UE may select a beam, and then select random access resource associated with the selected beam. For UE to select a good beam, the network may configure a threshold for beam selection. Then UE may measure each beam transmitted by the cell. If there is at least one beam(s) (e.g., SSB(s) or CSI-RS(s)) whose quality (e.g., RSRP) is above the threshold, the UE may select the RA resource associated one of beams whose quality (e.g., RSRP) is above the threshold. Otherwise, the UE may select the RA resource associated with any beam that the UE chooses.

[0310] The beam burst (e.g., SSB burst) may be fixed. For example, the same beam burst may be periodically transmitted by the network. As the number of beams in one beam burst increases, expected beam gain increases if the UE and network use the same beam that is best or good enough among the beams, for communication. But, for a given beam burst periodicity, to enable the UE to select the optimal beam, the base station should transmit a large number of beams which may lead to energy transmission burden. In addition, to enable the terminal to select the optimal beam, the UE should measure a large number of beams which may lead to measurement burden.

[0311] Therefore, efficient method for an adaptive beam burst transmission, rather than a fixed beam burst transmission, may be beneficial to achieve best trade-off between network energy consumption and beam gain (overall communication performance).

[0312] According to implementations of the present disclosure, adaptive beam burst transmission is proposed. In the adaptative beam burst transmission, beams comprising each beam burst may not be fixed, e.g., time-varying. The UE may receive information related to multiple beam burst types transmitted by the network. For example, different beam burst type may have different number of beams. For example, different beam burst type may vary over time. Based on the information related to multiple beam burst types, the UE may figure out which beam burst types are transmitted by the network. Based on the information related to multiple beam burst types, the UE measure one or more beams of a beam burst. Based on the information related to multiple beam burst types, The UE may identify the type of the beam burst.

[0313] More specifically, the UE may receive information related to multiple beam burst types. Based on the information related to multiple beam burst types, the UE may determine which beam burst is being transmitted and when. For example, different beam bursts may have different beam configurations. For example, different beam bursts may have different transmission timings (e.g., temporally interleaved transmissions or different transmission periods and offsets). For example, different beam bursts may have different good beam thresholds (e.g., burst type-specific thresholds). For example, different beam bursts may be transmitted semi-statically based on system information and / or RRC configurations. For example, different beam bursts may be transmitted dynamically based on dynamic indications (e.g., DCI / MAC CE / RRC).

[0314] According to implementations of the present disclosure, upon receiving an indication for triggering random access procedure, the UE may identify a type of a concerned beam burst whose measurement results are obtained. Then, the UE may choose a random access resource based on the identified type of the beam burst.

[0315] More specifically, the UE may determine beam quality and / or select radio resources associated with a beam based on the measurement results of one or more beam bursts. When determining beam quality and / or selecting radio resources associated with a beam, the UE may determine whether to use the measurement results solely on the fastest arriving beam burst or to consider other types or even specific types of beam bursts. Such determination and / or selection may be based on separate network instructions. The resource selection may include UL transmission resource selection (e.g., preamble selection for random access procedure or Configured Grant (CG) resource selection) or DL reception resource selection (e.g., DL control channel reception). When determining a good beam, thresholds corresponding to the currently transmitted beam burst type (burst type-specific thresholds) may be applied.

[0316] In the following description, for the sake of convenience, two types of beam bursts, e.g., a first type of beam burst and a second type of a beam burst, will be considered mostly. That is, the network may transmit the first type beam burst and the second beam burst type alternately over time. However, the present disclosure can be generalized to transmission of beam bursts with more than two beam bursts that may be transmitted on a regular basis (e.g., fixed-pattern based) or on a dynamical basis (e.g., beam burst transmission pattern can be dynamically changed, based on dynamic network indication), without loss of generality.

[0317] For example, if the beam burst type is a first type, the UE may select a beam and / or radio resources associated with the beams of the beam burst, based on the measurement result of the beams. In this selection method, a first threshold may be considered such that if there is any beam whose quality is higher than the first threshold (hereinafter, a beam whose quality is higher than the first threshold is referred to as good-quality beam), the UE may select the beam among good-quality beams and select random access resources based on the selected beam. If there is no beam whose quality is higher than the first threshold, the UE may arbitrarily select a beam of the beam burst and select random access resources based on the selected beam.

[0318] For example, if the beam burst type is a second type, the UE may determine whether to select a beam and / or random access resources associated with the beams of the beam burst, based on beam quality of the best beam of the beam burst. In this selection method, if the best beam quality is higher than a second threshold, the UE may select random access resources based on the best beam. If the best beam quality is not higher than the second threshold, the UE may skip selecting random access resources associated with the beams of the beam burst. The UE may use next-occurring beam burst for random access resource selection.

[0319] If there are more than two beam burst types, there may be one full beam burst type and others may be reduced beam burst type. Then, the full beam burst type may correspond to the first beam burst type and the reduced beam burst type may correspond to the second burst type.

[0320] The following drawings are created to explain specific embodiments of the present disclosure. The names of the specific devices or the names of the specific signals / messages / fields shown in the drawings are provided by way of example, and thus the technical features of the present disclosure are not limited to the specific names used in the following drawings.

[0321] An embodiment of the present disclosure related to a specific drawing described below may be combined with various embodiments of the present disclosure related to other drawings, and some descriptions, functions, procedures, proposals, methods and / or operations of the embodiment may be omitted.

[0322] FIG. 8 shows an example of a method to which implementations of the present disclosure are applied.

[0323] In step S800, the method comprises receiving information related to multiple beam burst types from a network.

[0324] In some implementations, the multiple beam burst types may have at least one of different beam configurations, different transmission timings, or different thresholds. The different beam configurations may have a different set of transmitted beams or different transmit powers. The different transmission timings may have different transmission periodicities or different transmission timing patterns. The different thresholds may be related to selecting a good beam of transmitted beams.

[0325] In some implementations, the multiple beam burst types may be received semi-statically via RRC signaling.

[0326] In some implementations, the multiple beam burst types may be received dynamically via downlink control information or MAC CE.

[0327] In step S810, the method comprises identifying a type of the beam burst based on the information.

[0328] In step S820, the method comprises measuring a beam burst based on identifying the type of the beam burst.

[0329] In some implementations, communicating with the network may comprise, selecting a beam based on at least one of the type of the beam burst or the measurement result of the beam burst, and communicating with the network based on the selected beam.

[0330] In some implementations, selecting of the beam may comprises determining whether to select the beam from a current beam burst based on at least one of the type of the beam burst or the measurement result of the beam burst. For example, selecting of the beam may comprises determining to select the beam from the current beam burst based on the type of the beam burst being a first type, and selecting the beam from the current beam burst. Or, selecting of the beam may comprise determining to select the beam from the current beam burst based on i) the type of the beam burst being a second type, and ii) the measurement result of the beam burst being higher than a threshold, and selecting the beam from the current beam burst.

[0331] For example, selecting of the beam may comprise determining not to select the beam from the current beam burst based on i) the type of the beam burst being a second type, and ii) the measurement result of the beam burst not being higher than a threshold. In this case, selecting of the beam may comprise skipping a beam selection from the current beam burst, and / or selecting the beam from a beam burst other than the current beam burst.

[0332] In some implementations, selecting of the beam may comprise identifying a configuration of a current beam burst based on identifying the type of the beam burst, and selecting the beam from the current beam burst.

[0333] In step S830, the method comprises communicating with the network based on a measurement result of the beam burst.

[0334] In some implementations, the method may further comprise selecting an uplink radio resource associated with the selected beam, and transmitting data or signal based on the selected uplink radio resource. The selected uplink radio resource may include at least one of a random access resource or configured grant resource.

[0335] In some implementations, the method may further comprise selecting a downlink radio resource associated with the selected beam, and receiving data or signal based on the selected downlink radio resource. The selected downlink radio resource may include at least one of a downlink control channel resource or downlink data channel resource channel.

[0336] In some implementations, the method may further comprise receiving random access triggering information. The random access triggering information may include information related to a random access resource selection method.

[0337] In some implementations, the method may further comprise identifying a configuration of transmitted beams of a current beam burst based on identifying the type of the beam burst, measuring the transmitted beams of the current beam based on the identified configuration of the transmitted beams of the current beam burst, and transmitting information related to a measurement result of the transmitted beams of the current beam burst to the network.

[0338] In some implementations, the method may further comprise receiving a random access configuration from the network. The random access configuration may include an association between random access resources and beams of each beam burst.

[0339] In some implementations, the method may be performed by a wireless device in communication with at least one of a mobile device, a network, and / or autonomous vehicles other than the wireless device.

[0340] Furthermore, the wireless device may be implemented by the first wireless device 100 shown in FIG. 2 and / or the UE 100 shown in FIG. 3.

[0341] The wireless device comprises at least one transceiver, at least one processor, and at least one memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, cause the wireless device to perform the method described in FIG. 8.

[0342] More specifically, the wireless device receives information related to multiple beam burst types from a network.

[0343] In some implementations, the multiple beam burst types may have at least one of different beam configurations, different transmission timings, or different thresholds. The different beam configurations may have a different set of transmitted beams or different transmit powers. The different transmission timings may have different transmission periodicities or different transmission timing patterns. The different thresholds may be related to selecting a good beam of transmitted beams.

[0344] In some implementations, the multiple beam burst types may be received semi-statically via RRC signaling.

[0345] In some implementations, the multiple beam burst types may be received dynamically via downlink control information or MAC CE.

[0346] The wireless device identifies a type of the beam burst based on the information.

[0347] The wireless device measures a beam burst based on identifying the type of the beam burst.

[0348] In some implementations, communicating with the network may comprise, selecting a beam based on at least one of the type of the beam burst or the measurement result of the beam burst, and communicating with the network based on the selected beam.

[0349] In some implementations, selecting of the beam may comprises determining whether to select the beam from a current beam burst based on at least one of the type of the beam burst or the measurement result of the beam burst. For example, selecting of the beam may comprises determining to select the beam from the current beam burst based on the type of the beam burst being a first type, and selecting the beam from the current beam burst. Or, selecting of the beam may comprise determining to select the beam from the current beam burst based on i) the type of the beam burst being a second type, and ii) the measurement result of the beam burst being higher than a threshold, and selecting the beam from the current beam burst.

[0350] For example, selecting of the beam may comprise determining not to select the beam from the current beam burst based on i) the type of the beam burst being a second type, and ii) the measurement result of the beam burst not being higher than a threshold. In this case, selecting of the beam may comprise skipping a beam selection from the current beam burst, and / or selecting the beam from a beam burst other than the current beam burst.

[0351] In some implementations, selecting of the beam may comprise identifying a configuration of a current beam burst based on identifying the type of the beam burst, and selecting the beam from the current beam burst.

[0352] The wireless device communicates with the network based on a measurement result of the beam burst.

[0353] In some implementations, the wireless device may select an uplink radio resource associated with the selected beam, and transmit data or signal based on the selected uplink radio resource. The selected uplink radio resource may include at least one of a random access resource or configured grant resource.

[0354] In some implementations, the wireless device may select a downlink radio resource associated with the selected beam, and receive data or signal based on the selected downlink radio resource. The selected downlink radio resource may include at least one of a downlink control channel resource or downlink data channel resource channel.

[0355] In some implementations, the wireless device may receive random access triggering information. The random access triggering information may include information related to a random access resource selection method.

[0356] In some implementations, the wireless device may identify a configuration of transmitted beams of a current beam burst based on identifying the type of the beam burst, measure the transmitted beams of the current beam based on the identified configuration of the transmitted beams of the current beam burst, and transmit information related to a measurement result of the transmitted beams of the current beam burst to the network.

[0357] In some implementations, the wireless device may receive a random access configuration from the network. The random access configuration may include an association between random access resources and beams of each beam burst.

[0358] Furthermore, the method described above in FIG. 8 may be performed by control of a processing apparatus. The processing apparatus may be implemented by the processor 102 included in the first wireless device 100 shown in FIG. 2 and / or the processor 102 included in the UE 100 shown in FIG. 3.

[0359] The processing apparatus comprises at least one processor that is integrated with a wireless device, and at least one memory comprising processor-executable instructions stored thereon that are configured to cause the at least one processor to perform the method described in FIG. 8.

[0360] Furthermore, the method described above in FIG. 8 may be performed by a software code 105 stored in the memory 104 included in the first wireless device 100 shown in FIG. 2.

[0361] The technical features of the present disclosure may be embodied directly in hardware, in a software executed by a processor, or in a combination of the two. For example, a method performed by a wireless device in a wireless communication may be implemented in hardware, software, firmware, or any combination thereof. For example, a software may reside in RAM, flash memory, ROM, EPROM, EEPROM, registers, hard disk, a removable disk, a CD-ROM, or any other storage medium.

[0362] Some example of storage medium may be coupled to the processor such that the processor can read information from the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. For other example, the processor and the storage medium may reside as discrete components.

[0363] The computer-readable medium may include a tangible and non-transitory computer-readable storage medium.

[0364] For example, non-transitory computer-readable media may include RAM such as Synchronous DRAM (SDRAM), ROM, Non-Volatile RAM (NVRAM), EEPROM, flash memory, magnetic or optical data storage media, or any other medium that can be used to store instructions or data structures. Non-transitory computer-readable media may also include combinations of the above.

[0365] In addition, the method described herein may be realized at least in part by a computer-readable communication medium that carries or communicates code in the form of instructions or data structures and that can be accessed, read, and / or executed by a computer.

[0366] According to some implementations of the present disclosure, a non-transitory Computer-Readable Medium (CRM) stores instructions that, based on being executed by at least one processor, perform the method described in FIG. 8.

[0367] FIG. 9 shows an example of another method to which implementations of the present disclosure are applied.

[0368] In step S900, the method comprises transmitting information related to multiple beam burst types to a wireless device.

[0369] In step S910, the method comprises communicating with the wireless device based on a measurement result of a beam burst, which is measured based on identifying a type of a beam burst.

[0370] Furthermore, the method described above in FIG. 9 may be performed by a base station. The base station may be implemented by the second wireless device 200 shown in FIG. 2.

[0371] The base station comprises at least one transceiver, at least one processor, and at least one memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, cause the base station to perform the method described in FIG. 9.

[0372] More specifically, the base station transmits information related to multiple beam burst types to a wireless device.

[0373] The base station communicates with the wireless device based on a measurement result of a beam burst, which is measured based on identifying a type of a beam burst.

[0374] FIG. 10 shows an example of an adaptive beam burst transmission and beam selection to which implementations of the present disclosure are applied.

[0375] In FIG. 10, two beam bursts with beam burst transmission periodicity being K SFN duration are alternately transmitted. The first beam burst comprises beams comprising {beam 1', 2', 3', 4'} and the second beam burst comprises {beam 1, 2, 3, 4, 5, 6, 7, 8}. Assuming that beams of first beam burst are a second type, and aim to cover the similar geographic area of beams of the second beam burst (which is a first type), it may be desirable that beams of the first beam burst are 2 times wider than those in the second beam burst. For this alternating beam burst transmission, the UE may receive, from network, the information related to the multiple beam burst types that enables the UE to know when and how the alternating beam burst transmission happens. For example, the information may inform the alternation is formed by "one" occurrence of the first beam burst and "one" occurrence of the second beam burst.

[0376] The UE may receive, from network, a random access configuration. The random access configuration may include association between random access resources and beams of each beam burst. For example, associated random access preamble and / or preamble set may be configured for each beam. For example, associated random access occasion and / or occasion set may be configured for each beam.

[0377] Furthermore, the random access configuration may include at least one of the following information.

[0378] - Total number of preambles used for contention based and contention free RA

[0379] - The number of preambles for a preamble group

[0380] - Set(s) of preambles which is associated with a feature or feature combination

[0381] - Power ramping step

[0382] - Random Access Response (RAR) window

[0383] - Preamble received target power

[0384] - The number of PRACH transmission occasions Frequency Division Multiplexed (FDM-ed) in one time instance

[0385] - Random access contention resolution timer

[0386] - Access identities for random access prioritization

[0387] - RSRP threshold of SSB used by UE to select the SSB and corresponding PRACH resource for path-loss estimation and (re)transmission based on SS blocks that satisfy the threshold

[0388] - Message power offset groupB used by UE for preamble selection

[0389] - Msg1 subcarrier spacing

[0390] - RA prioritization for slicing: RA prioritization parameters (power ramping, back-off indicator scaling factor), and / or prioritized slices

[0391] The UE may determine that random access needs to be triggered. The UE may determine to trigger RA based on indication received by the network (e.g., paging message) or indication received from the upper layer (e.g., service request).

[0392] The UE may measure each beam of a currently beam burst (e.g., a first beam burst). The UE may start measurements for the subsequent step for the purpose of random access resource selection, after the UE determines to trigger random access. Or, the measurement may be performed before the UE determines to trigger random access, and if the measurement results are considered valid upon the determination, the UE may use the measurement result for the subsequent step for the purpose of random access resource selection.

[0393] The UE may identify the type of the first beam burst. Based on the identified type of the first beam burst and the measurement result of the first beam burst, the UE may determine whether to select random access resource based on the measurement results of the beam burst and / or to select random access resource based on measurement results of another beam burst (e.g., second beam burst).

[0394] More specifically, if the beam burst is of a first type, the UE may select random access resource associated with the beams of this beam burst. The UE may select a random access preamble associated with the good-quality beam, if there is any good-quality beam in the beam burst. If there is no good-quality-beam, the UE may select a beam arbitrary among the beams of the beam burst, and select random access preamble associated with the selected beam.

[0395] If the beam burst is of a second type, the UE may determine whether to select random access resource based on quality of the beams of this beam burst. If there is any beam on the beam burst whose quality is higher than the second threshold, the UE may select random access resource associated with the beams of this beam burst. The UE may select a random access preamble associated with good-quality beam, if there is any good-quality beam in the beam burst.

[0396] If the quality of all beams of the beam burst is lower than the second threshold, the UE may not select random access resource based on the beams on this beam burst. The UE may not perform the selection random access resource based on this beam burst (e.g., first beam burst) and consider another beam burst (e.g., second beam burst) for random access resource selection. The UE may measure the second beam burst that is transmitted after the first beam burst, and use the measurement results of beam(s) of the second beam burst. Desirably, the second beam burst may be a beam burst that is closest to the first beam burst and is transmitted after the first beam burst in time domain. In this example, if the beam burst is a second type, the MAC entity may consider that the measurement result has not provided for this beam burst, if there is no beam on this beam burst whose quality is higher than the second threshold.

[0397] If the UE selects random access resources, the UE may execute random access by transmitting PRACH preamble and receive RAR by using the selected random access resources.

[0398] FIG. 11 shows another example of an adaptive beam burst transmission and beam selection to which implementations of the present disclosure are applied.

[0399] In FIG. 11, the UE selects random access resources based on largest beam burst because there is no good enough beam in the smaller beam burst. The operation of the UE according to an embodiment disclosed in FIG. 11 may be as follows.

[0400] 1. The network transmits two beam bursts. One beam burst (e.g., smaller beam burst) comprises {beam 1', 2', 3', 4'}. The other beam burst (e.g., larger beam burst) comprises {beam 1, 2, 3, 4, 5, 6, 7, 8}. Since there are only two beam bursts, the larger beam burst is the largest beam burst.

[0401] 2. The UE knows that network transmits the smaller beam burst and the largest beam burst.

[0402] 3. The UE receives random access triggering information from the upper layer (e.g., MO call).

[0403] 4. The UE measures beam burst that occurs earliest. That is, the UE measures beam 1', 2', 3', and 4'.

[0404] 5. The UE determines the measured beams as beams of the smaller beam burst.

[0405] 6. The UE compares the beam qualities of beams of the smaller beam burst with THRES, e.g., by comparing the best beam belonging to the smaller beam burst (i.e., beam 3') with the THRES.

[0406] 7. The UE determines that the beam quality of all beams in the smaller beam burst is lower than THRES1. Since the beam quality of all beams in the smaller beam burst is lower than THRES, the UE does not select a beam for random access resource selection. As a result, the UE does not select random access resource.

[0407] 8. Then, the UE measure another beam burst that occurs earliest. That is, the UE measure beam 1, 2, 3, 4, 5, 6, 7, and 8.

[0408] 9. The UE determines the measured beams as beams of the largest beam burst.

[0409] 10. Since the measured beams belong to the largest beam burst, the UE selects a beam among the largest beam burst the for random access resource selection, e.g., select the beat beam (i.e., beam 5) among the largest beam burst.

[0410] 11. Then the UE selects random access resources (including random access preamble associated with the selected beam) and execute random access procedure by using the selected random access resources.

[0411] FIG. 12 shows another example of an adaptive beam burst transmission and beam selection to which implementations of the present disclosure are applied.

[0412] In FIG. 12, the UE selects random access resources based on smaller beam burst because there is at least one good enough beam in the smaller beam burst. The operation of the UE according to an embodiment disclosed in FIG. 12 may be as follows.

[0413] 1. The network transmits two beam bursts. One beam burst (e.g., smaller beam burst) comprises {beam 1', 2', 3', 4'}. The other beam burst (e.g., larger beam burst) comprises {beam 1, 2, 3, 4, 5, 6, 7, 8}. Since there are only two beam bursts, the larger beam burst is the largest beam burst.

[0414] 2. The UE knows that network transmits the smaller beam burst and the largest beam burst.

[0415] 3. The UE receives random access triggering information from the upper layer (e.g., MO call).

[0416] 4. The UE measures beam burst that occurs earliest. That is, the UE measures beam 1', 2', 3', and 4'.

[0417] 5. The UE determines the measured beams as beams of the smaller beam burst.

[0418] 6. The UE compares the beam qualities of beams of the smaller beam burst with THRES, e.g., by comparing the best beam belonging to the smaller beam burst (i.e., beam 3') with the THRES.

[0419] 7. The UE determines that there is at least one beam whose quality is higher than THRES. Since there is at least one beam whose quality is higher than THRES, the UE selects a beam among the smaller beam burst for random access resource selection (e.g., beam 3').

[0420] 8. Then the UE selects random access resources (including random access preamble associated with the selected beam) and execute random access procedure by using the selected random access resources.

[0421] FIG. 13 shows another example of an adaptive beam burst transmission and beam selection to which implementations of the present disclosure are applied.

[0422] In FIG. 13, the UE determines whether to select random access resources based on best beam's quality or b) whether to select random access resource based on best beam without considering the quality of the best beam. The random access selection method may be indicated based on network indication.

[0423] The operation of the UE according to an embodiment disclosed in FIG. 13 may be as follows.

[0424] 1. The network transmits two beam bursts. One beam burst (e.g., smaller beam burst) comprises {beam 1', 2', 3', 4'}. The other beam burst (e.g., larger beam burst) comprises {beam 1, 2, 3, 4, 5, 6, 7, 8}. Since there are only two beam bursts, the larger beam burst is the largest beam burst. The UE knows that network transmits the smaller beam burst and the largest beam burst.

[0425] 2. The UE receives random access triggering information from the network. The random access triggering information may further inform that random access resource selection should be based on the best beam and the best beam's quality threshold.

[0426] 3. The UE measures beam burst that occurs earliest. That is, the UE measures beam 1', 2', 3', and 4'.

[0427] 4. The UE determines that the beam 3' is the best beam of beams of the beam burst.

[0428] 5. Since the network sent the random access triggering information informing that random access resource selection should be based on the best beam and the best beam's quality threshold, the UE compares the beam quality of the best beam with THRES.

[0429] 6. If the quality of the best beam is higher than THRES, the UE selects the best beam for random access resource selection. Then the UE selects random access resources (including RA preamble associated with the selected beam) and execute random access procedure by using the selected random access resources. If the quality of the best beam is not higher than THRES, the UE does select the best beam for random access resource selection. Then the UE does not select random access resources (including random access preamble associated with the selected beam) and as a result, the UE does not execute random access procedure based on the beam burst.

[0430] 7. The UE receives another random access triggering information from the network. The random access triggering information may further inform that random access resource selection should be based on the best beam. Depending on embodiments, if the UE did not execute random access procedure due to the reason that there is no good enough beam in the previous beam burst measurements, as shown in the step 6, the UE may proceed with the subsequent steps without receiving another indication.

[0431] 8. The UE measures beam burst that occurs earliest. That is, the UE measures beam 1, 2, 3, 4, 5, 6, 7, 8.

[0432] 9. The UE determines that the beam 5 is the best beam of beams of the beam burst.

[0433] 10. Since the network sent the random access triggering information informing that random access resource selection should be based on the best beam, the UE selects the best beam for random access resource selection. Then the UE selects random access resources (including RA preamble associated with the selected beam).

[0434] In the examples described above, it is assumed that the transmission pattern of the multiple beam bursts is fixed. In this case, the transmission pattern information may be provided to the UE via RRC signaling or common signaling such as system information that can change only semi-statically. But, it is possible that the transmission pattern is not fixed. The network may preconfigure the UE with multiple patterns and dynamically indicate one active pattern to apply. Alternative, the network may indicate the UE the upcoming type of beam bursts. In this case, the UE may assume that the indicated beam burst is transmitted until a new indication of beam burst is received.

[0435] In the examples described above, beam selection for random access resource selection has been focused. The beam selection according to the present disclosure may be used for selecting other resources, such as configured grant resources or beam selection for monitoring downlink control channel (e.g., PDCCH)

[0436] The present disclosure may have various advantageous effects.

[0437] For example, the network can reduce the average number of beam transmission over unit time, thus achieving energy saving gain. Therefore, the network can reduce the beam transmission overhead required for the UE to select the optimal beam.

[0438] For example, if the UE detects a good beam in a smaller beam burst, the UE can trigger random access based on random access resource associated with the good beam, and if not, the UE can try to find a good beam in another / larger beam burst, if any.

[0439] For example, the UE can distinguish between cases where it is desirable to select a beam with very good quality even if it means accepting some time delay, and cases where it is desirable to select a beam with moderately good quality while minimizing time delay.

[0440] Advantageous effects which can be obtained through specific embodiments of the present disclosure are not limited to the advantageous effects listed above. For example, there may be a variety of technical effects that a person having ordinary skill in the related art can understand and / or derive from the present disclosure. Accordingly, the specific effects of the present disclosure are not limited to those explicitly described herein, but may include various effects that may be understood or derived from the technical features of the present disclosure.

[0441] Claims in the present disclosure can be combined in a various way. For instance, technical features in method claims of the present disclosure can be combined to be implemented or performed in an apparatus, and technical features in apparatus claims can be combined to be implemented or performed in a method. Further, technical features in method claim(s) and apparatus claim(s) can be combined to be implemented or performed in an apparatus. Further, technical features in method claim(s) and apparatus claim(s) can be combined to be implemented or performed in a method. Other implementations are within the scope of the following claims.

Claims

A method comprising:receiving information related to multiple beam burst types from a network;identifying a type of the beam burst based on the information;measuring a beam burst based on identifying the type of the beam burst; andcommunicating with the network based on a measurement result of the beam burst.The method of claim 1, wherein communicating with the network comprises:selecting a beam based on at least one of the type of the beam burst or the measurement result of the beam burst; andcommunicating with the network based on the selected beam.The method of claim 2, wherein selecting of the beam comprises:determining whether to select the beam from a current beam burst based on at least one of the type of the beam burst or the measurement result of the beam burst.The method of claim 3, wherein selecting of the beam comprises:determining to select the beam from the current beam burst based on the type of the beam burst being a first type; andselecting the beam from the current beam burst.The method of claim 3, wherein selecting of the beam comprises:determining to select the beam from the current beam burst based on i) the type of the beam burst being a second type, and ii) the measurement result of the beam burst being higher than a threshold; andselecting the beam from the current beam burst.The method of claim 3, wherein selecting of the beam comprises:determining not to select the beam from the current beam burst based on i) the type of the beam burst being a second type, and ii) the measurement result of the beam burst not being higher than a threshold.The method of claim 6, wherein selecting of the beam comprises:skipping a beam selection from the current beam burst.The method of claim 6 or 7, wherein selecting of the beam comprises:selecting the beam from a beam burst other than the current beam burst.The method of claim 2, wherein selecting of the beam comprises:identifying a configuration of a current beam burst based on identifying the type of the beam burst; andselecting the beam from the current beam burst.The method of any claims 2 to 9, wherein the method further comprises:selecting an uplink radio resource associated with the selected beam; andtransmitting data or signal based on the selected uplink radio resource,wherein the selected uplink radio resource includes at least one of a random access resource or configured grant resource.The method of any claims 2 to 10, wherein the method further comprises:selecting a downlink radio resource associated with the selected beam; andreceiving data or signal based on the selected downlink radio resource,wherein the selected downlink radio resource includes at least one of a downlink control channel resource or downlink data channel resource channel.The method of any claims 1 to 11, wherein the method further comprises receiving random access triggering information, andwherein the random access triggering information includes information related to a random access resource selection method.The method of any claims 1 to 12, wherein the method further comprises:identifying a configuration of transmitted beams of a current beam burst based on identifying the type of the beam burst;measuring the transmitted beams of the current beam based on the identified configuration of the transmitted beams of the current beam burst; andtransmitting information related to a measurement result of the transmitted beams of the current beam burst to the network.The method of any claims 1 to 13, wherein the multiple beam burst types have at least one of different beam configurations, different transmission timings, or different thresholds.The method of claim 14, wherein the different beam configurations have a different set of transmitted beams or different transmit powers,wherein the different transmission timings have different transmission periodicities or different transmission timing patterns, andwherein the different thresholds are related to selecting a good beam of transmitted beams.The method of any claims 1 to 15, wherein the multiple beam burst types are received semi-statically via a radio resource control (RRC) signaling.The method of any claims 1 to 16, wherein the multiple beam burst types are received dynamically via downlink control information or a media access control (MAC) control element (CE).The method of any claims 1 to 17, wherein the method further comprises receiving a random access configuration from the network, andwherein the random access configuration includes an association between random access resources and beams of each beam burst.The method of any claims 1 to 18, wherein the method is performed by a wireless device in communication with at least one of a mobile device, a network, and / or autonomous vehicles other than the wireless device.A wireless device comprising:at least one transceiver;at least one processor; andat least one memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, cause the wireless device to perform the method of any claims 1 to 19.A processing apparatus comprising:at least one processor that is integrated with a wireless device; andat least one memory comprising processor-executable instructions stored thereon that are configured to cause the at least one processor to perform the method of any claims 1 to 19.A non-transitory Computer Readable Medium (CRM) storing instructions that, based on being executed by at least one processor, perform the method of any claims 1 to 19.A method comprising:transmitting information related to multiple beam burst types to a wireless device; andcommunicating with the wireless device based on a measurement result of a beam burst, which is measured based on identifying a type of a beam burst.A base station comprising:at least one transceiver;at least one processor; andat least one memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, cause the base station to perform the method of claim 23.

Images