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WO2025206696A1 - Procédé et appareil de sélection de ressource pour un accès aléatoire à une cellule voisine - Google Patents

Procédé et appareil de sélection de ressource pour un accès aléatoire à une cellule voisine

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Publication number
WO2025206696A1
WO2025206696A1 PCT/KR2025/003772 KR2025003772W WO2025206696A1 WO 2025206696 A1 WO2025206696 A1 WO 2025206696A1 KR 2025003772 W KR2025003772 W KR 2025003772W WO 2025206696 A1 WO2025206696 A1 WO 2025206696A1
Authority
WO
WIPO (PCT)
Prior art keywords
random access
wireless device
cell
neighbour cell
occasion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/KR2025/003772
Other languages
English (en)
Inventor
Sangwon Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
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Filing date
Publication date
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Publication of WO2025206696A1 publication Critical patent/WO2025206696A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/005—Transmission of information for alerting of incoming communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • the present disclosure relates to a method and apparatus for selecting resource for random access to a neighbour cell.
  • 3rd generation partnership project (3GPP) long-term evolution (LTE) is a technology for enabling high-speed packet communications.
  • 3GPP 3rd generation partnership project
  • LTE long-term evolution
  • Many schemes have been proposed for the LTE objective including those that aim to reduce user and provider costs, improve service quality, and expand and improve coverage and system capacity.
  • the 3GPP LTE requires reduced cost per bit, increased service availability, flexible use of a frequency band, a simple structure, an open interface, and adequate power consumption of a terminal as an upper-level requirement.
  • the 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.
  • eMBB enhanced mobile broadband
  • mMTC massive machine-type-communications
  • URLLC ultra-reliable and low latency communications
  • the NR shall be inherently forward compatible.
  • the UE should transmit a Random Access Preamble to the neighbour cell and then monitor PDCCH of the neighbour cell for a certain period of time to receive the Random Access Response from the neighbour cell.
  • the UE may miss paging message. Similarly, if RAR window is overlapped with the paging occasion, the UE cannot monitor the PDCCH of the serving cell during paging occasion and may miss paging message.
  • the present disclosure can have various advantageous effects.
  • the wireless device could efficiently select resource for random access to a neighbour cell.
  • the UE can monitor the serving cell during paging occasion and does not miss paging, by selecting PRACH occasion of the neighbour cell which is not overlapped with the paging occasion of the serving cell.
  • the wireless device could perform the RACH procedure to the neighbour cell.
  • the wireless communication system could provide an efficient solution for selecting resource for random access to a neighbour cell.
  • FIG. 1 shows an example of a communication system to which implementations of the present disclosure is applied.
  • FIG. 2 shows an example of wireless devices to which implementations of the present disclosure is applied.
  • FIG. 4 shows another example of wireless devices to which implementations of the present disclosure is applied.
  • FIG. 10 shows an example of System information acquisition.
  • FIG. 15 shows an example of a method for resource selection for Random Access to neighbour cell.
  • 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).
  • IEEE institute of electrical and electronics engineers
  • Wi-Fi Wi-Fi
  • WiMAX IEEE 802.16
  • E-UTRA evolved 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 DL and SC-FDMA in UL.
  • LTE-advanced (LTE-A) is an evolved version of 3GPP LTE.
  • a or B may mean “only A”, “only B”, or “both A and B”.
  • a or B in the present disclosure may be interpreted as “A and/or B”.
  • A, B or C in the present disclosure may mean “only A”, “only B”, “only C”, or "any combination of A, B and C”.
  • At least one of A and B may mean “only A”, “only B” or “both A and B”.
  • 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”.
  • FIG. 1 shows an example of a communication system to which implementations of the present disclosure is applied.
  • 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.
  • 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).
  • eMBB enhanced mobile broadband
  • mMTC massive machine type communication
  • URLLC ultra-reliable and low latency communications
  • eMBB far surpasses basic mobile Internet access and covers abundant bidirectional work and media and entertainment applications in cloud and augmented reality.
  • Data is one of 5G core motive forces and, in a 5G era, a dedicated voice service may not be provided for the first time.
  • voice will be simply processed as an application program using data connection provided by a communication system.
  • Main causes for increased traffic volume are due to an increase in the size of content and an increase in the number of applications requiring high data transmission rate.
  • a streaming service (of audio and video), conversational video, and mobile Internet access will be more widely used as more devices are connected to the Internet.
  • URLLC includes a new service that will change industry through remote control of main infrastructure and an ultra-reliable/available low-latency link such as a self-driving vehicle.
  • a level of reliability and latency is essential to control a smart grid, automatize industry, achieve robotics, and control and adjust a drone.
  • 5G is a means of providing streaming evaluated as a few hundred megabits per second to gigabits per second and may complement fibre-to-the-home (FTTH) and cable-based broadband (or DOCSIS). Such fast speed is needed to deliver TV in resolution of 4K or more (6K, 8K, and more), as well as virtual reality and augmented reality.
  • Virtual reality (VR) and augmented reality (AR) applications include almost immersive sports games.
  • a specific application program may require a special network configuration. For example, for VR games, gaming companies need to incorporate a core server into an edge network server of a network operator in order to minimize latency.
  • Mission critical application is one of 5G use scenarios.
  • a health part contains many application programs capable of enjoying benefit of mobile communication.
  • a communication system may support remote treatment that provides clinical treatment in a faraway place. Remote treatment may aid in reducing a barrier against distance and improve access to medical services that cannot be continuously available in a faraway rural area. Remote treatment is also used to perform important treatment and save lives in an emergency situation.
  • the wireless sensor network based on mobile communication may provide remote monitoring and sensors for parameters such as heart rate and blood pressure.
  • 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.
  • the UAV may be, for example, an aircraft availed by a wireless control signal without a human being onboard.
  • a first wireless device 100 and a second wireless device 200 may transmit/receive radio signals to/from an external device through a variety of RATs (e.g., LTE and NR).
  • RATs e.g., LTE and NR
  • ⁇ 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 processor(s) 202 may receive radio signals including fourth information/signals through the transceiver(s) 106 and then store information obtained by processing the fourth information/signals in the memory(s) 204.
  • the memory(s) 204 may be connected to the processor(s) 202 and may store a variety of information related to operations of the processor(s) 202.
  • the memory(s) 204 may store software code including commands for performing a part or the entirety of processes controlled by the processor(s) 202 or for performing the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts described in the present disclosure.
  • the processor(s) 202 and the memory(s) 204 may be a part of a communication modem/circuit/chip designed to implement RAT (e.g., LTE or NR).
  • the transceiver(s) 206 may be connected to the processor(s) 202 and transmit and/or receive radio signals through one or more antennas 208.
  • Each of the transceiver(s) 206 may include a transmitter and/or a receiver.
  • the transceiver(s) 206 may be interchangeably used with RF unit(s).
  • the second wireless device 200 may represent a communication modem/circuit/chip.
  • One or more protocol layers may be implemented by, without being limited to, one or more processors 102 and 202.
  • 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).
  • 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).
  • PHY physical
  • MAC media access control
  • RLC radio link control
  • PDCP packet data convergence protocol
  • RRC radio resource control
  • SDAP service data adaptation protocol
  • the wireless device may be implemented in various forms according to a use-case/service (refer to FIG. 1).
  • the control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140 and controls overall operation of each of the wireless devices 100 and 200. For example, the control unit 120 may control an electric/mechanical operation of each of the wireless devices 100 and 200 based on programs/code/commands/information stored in the memory unit 130.
  • the control unit 120 may transmit the information stored in the memory unit 130 to the exterior (e.g., other communication devices) via the communication unit 110 through a wireless/wired interface or store, in the memory unit 130, information received through the wireless/wired interface from the exterior (e.g., other communication devices) via the communication unit 110.
  • the additional components 140 may be variously configured according to types of the wireless devices 100 and 200.
  • the additional components 140 may include at least one of a power unit/battery, input/output (I/O) unit (e.g., audio I/O port, video I/O port), a driving unit, and a computing unit.
  • I/O input/output
  • the wireless devices 100 and 200 may be implemented in the form of, without being limited to, the robot (100a of FIG. 1), the vehicles (100b-1 and 100b-2 of FIG. 1), the XR device (100c of FIG. 1), the hand-held device (100d of FIG. 1), the home appliance (100e of FIG. 1), the IoT device (100f of FIG.
  • the entirety of the various elements, components, units/portions, and/or modules in the wireless devices 100 and 200 may be connected to each other through a wired interface or at least a part thereof may be wirelessly connected through the communication unit 110.
  • the control unit 120 and the communication unit 110 may be connected by wire and the control unit 120 and first units (e.g., 130 and 140) may be wirelessly connected through the communication unit 110.
  • Each element, component, unit/portion, and/or module within the wireless devices 100 and 200 may further include one or more elements.
  • the control unit 120 may be configured by a set of one or more processors.
  • wireless devices 100 and 200 may correspond to the wireless devices 100 and 200 of FIG. 2 and may be configured by various elements, components, units/portions, and/or modules.
  • the first wireless device 100 may include at least one transceiver, such as a transceiver 106, and at least one processing chip, such as a processing chip 101.
  • the processing chip 101 may include at least one processor, such a processor 102, and at least one memory, such as a memory 104.
  • 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 software code 105 which implements instructions that, when executed by the processor 102, perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure.
  • the second wireless device 200 may include at least one transceiver, such as a transceiver 206, and at least one processing chip, such as a processing chip 201.
  • the processing chip 201 may include at least one processor, such a processor 202, and at least one memory, such as a memory 204.
  • 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 software code 205 which implements instructions that, when executed by the processor 202, perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure.
  • a UE 100 may correspond to the first wireless device 100 of FIG. 2 and/or the first wireless device 100 of FIG. 4.
  • a UE 100 includes a processor 102, a memory 104, a transceiver 106, one or more antennas 108, a power management module 110, a battery 1112, a display 114, a keypad 116, a subscriber identification module (SIM) card 118, a speaker 120, and a microphone 122.
  • SIM subscriber identification module
  • processor 102 may be found in SNAPDRAGON TM series of processors made by Qualcomm ® , EXYNOS TM series of processors made by Samsung ® , A series of processors made by Apple ® , HELIO TM series of processors made by MediaTek ® , ATOM TM series of processors made by Intel ® or a corresponding next generation processor.
  • 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.
  • modules e.g., procedures, functions, etc.
  • 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.
  • the power management module 110 manages power for the processor 102 and/or the transceiver 106.
  • the battery 112 supplies power to the power management module 110.
  • the SIM card 118 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.
  • IMSI international mobile subscriber identity
  • the main services and functions of the RRC sublayer include: broadcast of system information related to AS and NAS; paging initiated by 5GC or 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.
  • SRBs signaling radio bearers
  • DRBs data radio bearers
  • 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
  • FIG. 8 shows a frame structure in a 3GPP based wireless communication system to which implementations of the present disclosure is applied.
  • OFDM numerologies e.g., subcarrier spacing (SCS), transmission time interval (TTI) duration
  • SCCS subcarrier spacing
  • TTI transmission time interval
  • symbols may include OFDM symbols (or CP-OFDM symbols), SC-FDMA symbols (or discrete Fourier transform-spread-OFDM (DFT-s-OFDM) symbols).
  • a slot includes plural symbols (e.g., 14 or 12 symbols) in the time domain.
  • a resource grid of N size,u grid,x * N RB sc subcarriers and N subframe,u symb OFDM symbols is defined, starting at common resource block (CRB) N start,u grid indicated by higher-layer signaling (e.g., RRC signaling), where N size,u grid,x is the number of resource blocks (RBs) in the resource grid and the subscript x is DL for downlink and UL for uplink.
  • N RB sc is the number of subcarriers per RB. In the 3GPP based wireless communication system, N RB sc is 12 generally.
  • RBs are classified into CRBs and physical resource blocks (PRBs).
  • CRBs are numbered from 0 and upwards in the frequency domain for subcarrier spacing configuration u .
  • the center of subcarrier 0 of CRB 0 for subcarrier spacing configuration u coincides with 'point A' which serves as a common reference point for resource block grids.
  • PRBs are defined within a bandwidth part (BWP) and numbered from 0 to N size BWP,i -1, where i is the number of the bandwidth part.
  • BWP bandwidth part
  • FR1 may include a frequency band of 410MHz to 7125MHz as shown in Table 4 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).
  • 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.
  • 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.
  • 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.
  • the UE When CA is configured, the UE only has one RRC connection with the network.
  • one serving cell 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.
  • 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.
  • a UE in RRC_CONNECTED not configured with CA/DC there is only one serving cell comprised of the PCell.
  • serving cells is used to denote the set of cells comprised of the SpCell(s) and all SCells.
  • two MAC entities are configured in a UE: one for the MCG and one for the SCG.
  • FIG. 9 shows a data flow example in the 3GPP NR system to which implementations of the present disclosure is applied.
  • 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.
  • the uplink transport channels UL-SCH and RACH are mapped to their physical channels PUSCH and PRACH, respectively, and the downlink transport channels DL-SCH, BCH and PCH are mapped to PDSCH, PBCH and PDSCH, respectively.
  • uplink control information (UCI) is mapped to PUCCH
  • downlink control information (DCI) is mapped to PDCCH.
  • a MAC PDU related to UL-SCH is transmitted by a UE via a PUSCH based on an UL grant
  • a MAC PDU related to DL-SCH is transmitted by a BS via a PDSCH based on a DL assignment.
  • the power consumption of a radio access can be split into two parts: the dynamic part which is only consumed when data transmission/reception is ongoing, and the static part which is consumed all the time to maintain the necessary operation of the radio access devices, even when the data transmission/reception is not on-going.
  • the studied techniques are classified into time, frequency, spatial and power domains, and the technical descriptions as well as the legacy UE and specification impacts are summarized in the technical report.
  • the techniques in time and frequency domains mainly aim to reduce the power consumption for dynamic part by trying to shutdown more symbols on one or more carriers to achieve BS micro sleep, and even the static power part by enlarging the interval between the contiguous active transmission/reception occasions to achieve BS light/deep sleep.
  • the techniques in spatial and power domains mainly aim to reduce the power consumption of the TRX chains and PAs by trying to shutdown more spatial elements and/or reduce transmission power/power spectrum density, or increase the PA efficiency.
  • the techniques specified in Rel-18 include SSB-less SCell operation for inter-band CA for FR1 and co-located cells, enhancement on cell DTX/DRX mechanism including the alignment of cell DTX/DRX and UE DRX in RRC_CONNECTED mode, inter-node information exchange on cell DTX/DRX, techniques in spatial and power domains to enable efficient adaptation of spatial elements as well as efficient adaptation of power offset values between PDSCH and CSI-RS, as well as mechanisms to prevent legacy UEs camping on cells adopting the Rel-18 NES techniques, CHO procedure enhancement(s), and inter-node beam activation and enhancements on restricting paging in a limited area, and the corresponding RRM/RF core requirements.
  • Rel-19 work item aims to specify further network energy savings targeting the beneficial techniques studied in Rel-18, but yet unspecified, including on-demand SSB and on-demand SIB1 transmissions, as well as adaptation of common signal/channel transmissions.
  • the objectives of the work item are the following:
  • On-demand SSB transmission can be used by UE for at least SCell time/frequency synchronization, L1/L3 measurements and SCell activation, and is supported for FR1 and FR2 in non-shared spectrum.
  • Triggering method by uplink wake-up-signal using an existing signal/channel.
  • Adaptation of paging occasions including confining the paging occasions in the time domain
  • Sections of 3GPP TS 38.331 v17.6.0 may be referred.
  • SI System Information
  • the MIB is always transmitted on the BCH with a periodicity of 80 ms and repetitions made within 80 ms and it includes parameters that are needed to acquire SIB1 from the cell.
  • the first transmission of the MIB is scheduled in subframes and repetitions are scheduled according to the period of SSB;
  • the MIB is transmitted with the same periodicity as that of SSB.
  • SIB1 is transmitted on the DL-SCH with a periodicity of 160 ms and variable transmission repetition periodicity within 160 ms.
  • the default transmission repetition periodicity of SIB1 is 20 ms but the actual transmission repetition periodicity is up to network implementation.
  • SIB1 repetition transmission period is 20 ms.
  • SIB1 transmission repetition period is the same as the SSB period.
  • SIB1 includes information regarding the availability and scheduling (e.g.
  • SIB1 is cell-specific SIB
  • SIBs other than SIB1 and posSIBs are carried in SystemInformation (SI) messages, which are transmitted on the DL-SCH.
  • SIBs and posSIBs are mapped to different SI messages, i.e. an SI message contains either only SIBs or only posSIBs.
  • SI-windows with same length for all SI messages.
  • Each SI message is associated with an SI-window and the SI-windows of different SI messages do not overlap. That is, within one SI-window only the corresponding SI message is transmitted.
  • SI message may be repeated with the same content a number of times within the SI-window.
  • Any SIB or posSIB except SIB1 can be configured to be cell specific or area specific, using an indication in SIB1 .
  • the cell specific SIB is applicable only within a cell that provides the SIB while the area specific SIB is applicable within an area referred to as SI area, which consists of one or several cells and is identified by s ystemInformationAreaID ;
  • mapping of SIBs to SI messages is configured in schedulingInfoList and schedulingInfoList2
  • mapping of posSIBs to SI messages is configured in posSchedulingInfoList and schedulingInfoList2 .
  • Each SIB and posSIB is contained at most once in an SI message.
  • the network can provide system information through dedicated signalling using the RRCReconfiguration message, e.g. if the UE has an active BWP with no common search space configured to monitor system information, paging, or upon request from the UE.
  • the network For PSCell and SCells, the network provides the required SI by dedicated signalling, i.e. within an RRCReconfiguration message. Nevertheless, the UE shall acquire MIB of the PSCell to get SFN timing of the SCG (which may be different from MCG). Upon change of relevant SI for SCell, the network releases and adds the concerned SCell. For PSCell, the required SI can only be changed with Reconfiguration with Sync.
  • the physical layer imposes a limit to the maximum size a SIB can take.
  • the maximum SIB1 or SI message size is 2976 bits.
  • FIG. 10 shows an example of System information acquisition.
  • the UE applies the SI acquisition procedure to acquire the AS, NAS- and positioning assistance data information.
  • the procedure applies to UEs in RRC_IDLE, in RRC_INACTIVE and in RRC_CONNECTED.
  • the UE in RRC_IDLE and RRC_INACTIVE shall ensure having a valid version of (at least) the MIB , SIB1 through SIB4 , SIB5 (if the UE supports E-UTRA), SIB11 (if the UE is configured for idle/inactive measurements), SIB12 (if UE is capable of NR sidelink communication/discovery and is configured by upper layers to receive or transmit NR sidelink communication/discovery), and SIB13 , SIB14 (if UE is capable of V2X sidelink communication and is configured by upper layers to receive or transmit V2X sidelink communication), SIB15 (if UE is configured by upper layers to report disaster roaming related information), SIB16 (if the UE is capable of slice-based cell reselection and the UE receives NSAG information for cell reselection from upper layer), SIB17 (if the UE is using TRS resources for power saving in RRC_IDLE and RRC_INACTIVE) and SIB19 (if UE is accessing
  • the UE capable of MBS broadcast which is receiving or interested to receive MBS broadcast service(s) via a broadcast MRB shall ensure having a valid version of SIB20 , regardless of the RRC state the UE is in.
  • the UE shall ensure having a valid version of the posSIB requested by upper layers.
  • the UE shall apply the SI acquisition procedure upon cell selection (e.g. upon power on), cell-reselection, return from out of coverage, after reconfiguration with sync completion, after entering the network from another RAT, upon receiving an indication that the system information has changed, upon receiving a PWS notification, upon receiving request (e.g., a positioning request) from upper layers; and whenever the UE does not have a valid version of a stored SIB or posSIB or a valid version of a requested SIB.
  • the UE When the UE acquires a MIB or a SIB1 or an SI message in a serving cell, and if the UE stores the acquired SIB, then the UE shall store the associated areaScope , if present, the first PLMN -Identity in the PLMN -IdentityInfoList for non-NPN-only cells or the first NPN identity (SNPN identity in case of SNPN, or PNI-NPN identity in case of PNI-NPN) in the NPN -IdentityInfoList for NPN-only cells, the cellIdentity , the systemInformationAreaID , if present, and the valueTag , if present, as indicated in the si - SchedulingInfo for the SIB.
  • the UE shall store the associated areaScope , if present, the cellIdentity , the systemInformationAreaID , if present, the valueTag , if provided in assistanceDataSIB -Element , and the expirationTime if provided in assistanceDataSIB-Element .
  • the UE may use a valid stored version of the SI except MIB , SIB1 , SIB6 , SIB7 or SIB8 e.g. after cell re-selection, upon return from out of coverage or after the reception of SI change indication.
  • the valueTag and expirationTime for posSIB is optionally provided in assistanceDataSIB-Element .
  • the UE shall:
  • SIB1 acquisition is required for the UE and ssb -SubcarrierOffset indicates that SIB1 is not scheduled in the cell:
  • the UE in RRC_CONNECTED is only required to acquire broadcasted SIB1 and MBS broadcast if the UE can acquire it without disrupting unicast or MBS multicast data reception, i.e., the broadcast and unicast/MBS multicast beams are quasi co-located.
  • the UE in RRC_INACTIVE state while SDT procedure is ongoing is only required to acquire broadcasted SIB1 and MIB if the UE can acquire them without disrupting unicast data reception, i.e. the broadcast and unicast beams are quasi co-located.
  • the UE shall, while SDT procedure is not ongoing:
  • the UE shall set the contents of RRCSystemInfoRequest message as follows:
  • the requestedPosSI -List to indicate the SI message(s) that the UE upper layers require for positioning operations, and for which posSI -BroadcastStatus is set to notBroadcasting .
  • the UE shall submit the RRCSystemInfoRequest message to lower layers for transmission.
  • the UE shall:
  • the UE shall, while SDT procedure is not ongoing:
  • si -RequestConfigRedcap corresponding to the SI message(s) that the UE requires to operate within the cell, and for which si - BroadcastStatus is set to notBroadcasting ;
  • - UE may include on demand request for SIB and/or posSIB(s) in the same DedicatedSIBRequest message.
  • the UE shall submit the DedicatedSIBRequest message to lower layers for transmission.
  • the UE Upon receiving the MIB the UE shall:
  • a UE capable of NTN access should acquire SIB1 to determine whether the cell is an NTN cell.
  • the UE Upon receiving the SIB1 the UE shall:
  • the cellAccessRelatedInfo contains an entry of a selected SNPN or PLMN and in case of PLMN the UE is either allowed or instructed to access the PLMN via a cell for which at least one CAG ID is broadcast:
  • npn - IdentityList in the remainder of the procedures use npn - IdentityList , trackingAreaCode, and cellIdentity for the cell as received in the corresponding entry of npn - IdentityInfoList containing the selected PLMN or SNPN;
  • the UE supports one or more of the frequency bands indicated in the frequencyBandList for downlink for TDD, or one or more of the frequency bands indicated in the frequencyBandList for uplink for FDD, and they are not downlink only bands, and
  • the UE is IAB-MT or supports at least one additionalSpectrumEmission in the NR - NS - PmaxList for a supported band in the downlink for TDD, or a supported band in uplink for FDD, and
  • uplinkConfigCommon for the SCS of the initial uplink BWP or, for RedCap UEs, RedCap-specific initial uplink BWP, if configured, and which
  • - is contained within the carrierBandwidth (indicated in supplementaryUplink for the SCS of the initial uplink BWP), and which
  • Sections of 3GPP TS 38.331 v17.6.0 may be referred.
  • the UE shall:
  • the SIB19 is essential for NTN access. If UE is unable to acquire the SIB19 for NTN access, the action is up to UE implementation (e.g., cell re-selection to other cells).
  • the UE shall scan all RF channels in the NR bands according to its capabilities to find a suitable cell.
  • the UE need only search for the strongest cell, except for operation with shared spectrum channel access where the UE may search for the next strongest cell(s).
  • this cell shall be selected.
  • This procedure requires stored information of frequencies and optionally also information on cell parameters from previously received measurement control information elements or from previously detected cells.
  • the UE shall select it.
  • the cell selection criterion S is fulfilled when:
  • Qoffsettemp Offset temporarily applied to a cell (dB)
  • Qqualminoffset Offset to the signalled Qqualmin taken into account in the Squal evaluation as a result of a periodic search for a higher priority PLMN while camped normally in a VPLMN.
  • the UE shall perform intra-frequency measurements.
  • the UE may choose not to perform measurements of NR inter-frequency cells of equal or lower priority, or inter-RAT frequency cells of lower priority;
  • the UE shall perform intra-frequency, inter-frequency or inter-RAT measurements before the t-Service, regardless of the distance between UE and the serving cell reference location or whether the serving cell fulfils Srxlev > S IntraSearchP and Squal > S IntraSearchQ , or Srxlev > S nonIntraSearchP and Squal > S nonIntraSearchQ ,
  • the exact time to start measurement before t-Service is up to UE implementation.
  • UE shall perform measurements of higher priority NR inter-frequency or inter-RAT frequencies regardless of the remaining service time of the serving cell (i.e. time remaining until t-Service ).
  • the UE mobility state is determined if the parameters (T CRmax , N CR_H , N CR_M , T CRmaxHyst and cellEquivalentSize ) are broadcasted in system information for the serving cell.
  • T CRmax If number of cell reselections during time period T CRmax is less than N CR_M .
  • T CRmax is greater than or equal to N CR_M but less than or equal to N CR_H .
  • T CRmax If number of cell reselections during time period T CRmax is greater than N CR_H .
  • the UE shall not consider consecutive reselections where a cell is reselected again right after one reselection for mobility state detection criteria. If the UE is capable of HSDN and the cellEquivalentSize is configured, the UE counts the number of cell reselections for this cell as cellEquivalentSize configured for this cell.
  • the UE shall:
  • the UE shall apply the speed dependent scaling rules.
  • Sections of 3GPP TS 38.321 v17.6.0 may be referred.
  • a new Random Access procedure is triggered while another is already ongoing in the MAC entity, it is up to UE implementation whether to continue with the ongoing procedure or start with the new procedure (e.g. for SI request).
  • the Random Access procedure is considered as the same Random Access procedure as the ongoing one and not initialized again.
  • UE When a Random Access procedure is initiated, UE selects a set of Random Access resources as specified in clause 5.1.1b and initialises the following parameters for the Random Access procedure according to the values configured by RRC for the selected set of Random Access resources:
  • - 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;
  • prach-ConfigurationSOffset-IAB the subframe/slot offset and applicable to IAB-MTs, altering the ROs subframe or slot defined in the baseline configuration indicated by prach-ConfigurationIndex;
  • preambleReceivedTargetPower initial Random Access Preamble power for 4-step RA type
  • rsrp-ThresholdSSB an RSRP threshold for the selection of the SSB for 4-step RA type. If the Random Access procedure is initiated for beam failure recovery, rsrp-ThresholdSSB used for the selection of the SSB within candidateBeamRSList refers to rsrp-ThresholdSSB in BeamFailureRecoveryConfig IE;
  • rsrp-ThresholdCSI-RS an RSRP threshold for the selection of CSI-RS for 4-step RA type. If the Random Access procedure is initiated for beam failure recovery, rsrp-ThresholdCSI-RS is equal to rsrp-ThresholdSSB in BeamFailureRecoveryConfig IE;
  • - 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;
  • FeatureCombination feature or a combination of features associated with a set of Random Access resources
  • - candidateBeamRSList a list of reference signals (CSI-RS and/or SSB) identifying the candidate beams for recovery and the associated Random Access parameters;
  • Random Access Preambles group B is configured:
  • Msg3 size (UL data available for transmission plus MAC subheader(s) and, where required, MAC CEs) is greater than ra-Msg3SizeGroupA and the pathloss is less than PCMAX (of the Serving Cell performing the Random Access Procedure) - preambleReceivedTargetPower - msg3-DeltaPreamble - messagePowerOffsetGroupB; or
  • the MAC entity determines the next available PRACH occasion from the PRACH occasions corresponding to the selected SSB in the association period given by ra-AssociationPeriodIndex in the si-RequestPeriod permitted by the restrictions given by the ra-ssb-OccasionMaskIndex if configured (the MAC entity shall select a PRACH occasion randomly with equal probability amongst the consecutive PRACH occasions corresponding to the selected SSB).
  • 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).
  • 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).
  • 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).
  • the UE uses the latest unfiltered L1-RSRP measurement.
  • RedCap UE in RRC_IDLE or RRC_INACTIVE mode is configured with a BWP indicated by initialDownlinkBWP-RedCap which is not associated with any SSB
  • SS-RSRP measurement is performed based on the SSB associated with the BWP indicated by initialDownlinkBWP.
  • SS-RSRP measurement can also be performed based on this NCD-SSB during SDT.
  • RedCap UE in RRC_IDLE or RRC_INACTIVE mode is configured with a BWP indicated by initialDownlinkBWP-RedCap which is not associated with any SSB for RACH, it is up to the UE implementation to perform a new RSRP measurements before Msg1/MsgA retransmission.
  • the UE should transmit a Random Access Preamble to the neighbour cell and then monitor PDCCH of the neighbour cell for a certain period of time to receive the Random Access Response from the neighbour cell.
  • the UE may miss paging message. Similarly, if RAR window is overlapped with the paging occasion, the UE cannot monitor the PDCCH of the serving cell during paging occasion and may miss paging message.
  • FIG. 11 shows an example of a scenario in which a paging occasion of a serving cell is overlapped with a RACH occasion of a SIB1-less neighbour cell.
  • UE may miss the paging occasion, when the UE monitors the PRACH occasion which is overlapped with the paging occasion.
  • a wireless device may be referred to as a user equipment (UE).
  • UE user equipment
  • FIG. 12 shows an example of a method for selecting resource for random access to a neighbour cell, according to some embodiments of the present disclosure.
  • FIG. 12 shows an example of a method performed by a wireless device in a wireless communication system.
  • the wireless device may select a serving cell.
  • the wireless device may camp on the serving cell.
  • the wireless device may initiate a random access procedure to a neighbour cell.
  • the random access configuration of the neighbour cell may include information related to requesting system information block type 1 (SIB1).
  • SIB1 system information block type 1
  • the wireless device may receive a SIB1 request configuration of the neighbour cell.
  • the SIB1 request configuration of the neighbour cell may include (i) information related to at least one RACH occasion of the neighbour cell and (ii) information related to at least one random access preamble for SIB1 request of the neighbour cell.
  • the wireless device may determine whether to request SIB1 transmission from the neighbour cell.
  • the wireless device may select an available random access channel (RACH) occasion based on a random access response (RAR) window related to the available RACH occasion being not overlapped with a paging occasion of the serving cell.
  • RACH random access channel
  • RAR random access response
  • the available RACH occasion may be further selected based on the available RACH occasion being not overlapped with a paging occasion of the serving cell.
  • the wireless device may select the available RACH occasion based on (i) the available RACH occasion being not overlapped with a paging occasion of the serving cell and (ii) the RAR window related to the available RACH occasion being not overlapped with a paging occasion of the serving cell.
  • the wireless device may transmit, to the neighbour cell, a random access preamble based on the available RACH occasion.
  • the wireless device may select a Synchronization Signal and PBCH block (SSB) of the neighbour cell.
  • the wireless device may select a random access preamble corresponding to the selected SSB.
  • SSB Synchronization Signal and PBCH block
  • the random access preamble may be transmitted for requesting SIB1 of the neighbour cell.
  • the random access preamble may be a SIB1 request for the neighbour cell.
  • the wireless device may acquire a SIB1 from the neighbour cell.
  • the neighbour cell may transmit a SIB1 in on-demand manner.
  • the wireless device may monitor the paging occasion of the serving cell. Since the available RACH occasion for transmitting the random access preamble and the RAR window related to the available RACH occasion are not overlapped with the paging occasion of the serving cell, the wireless device may transmit the random access preamble to the neighbour cell and receive the SIB1 from the neighbour cell, while monitoring the paging occasion of the serving cell.
  • the wireless device may be in communication with at least one of a user equipment, a network, or an autonomous vehicle other than the wireless device.
  • the UE selects a first available PRACH occasion of the neighbour cell, which satisfies that the available PRACH occasion of the neighbour cell is not overlapped with the paging occasion of the serving cell, and/or the RAR window associated with the available PRACH occasion is not overlapped with the paging occasion of the serving cell, and transmits the Random Access Preamble to the neighbour cell using the selected first available PRACH occasion of the neighbour cell.
  • the first available RACH occasion i.e., yellow RO in the figure below
  • the RAR window associated with the second available RACH occasion i.e., orange RAR window in the figure below
  • the third available RACH occasion i.e., green RO in the figure below
  • the RAR window associated with the third available RACH occasion i.e., green RAR window in the figure below
  • FIG. 13 shows an example of resources for a serving cell and a neighbour cell.
  • the first RACH occasion of the neighbour cell may be overlapped with a paging occasion of the serving cell.
  • the first RAR window related to the first RACH occasion may not be overlapped with a paging occasion of the serving cell.
  • the second RACH occasion of the neighbour cell may not be overlapped with a paging occasion of the serving cell.
  • the second RAR window related to the second RACH occasion may be overlapped with a paging occasion of the serving cell.
  • the third RACH occasion of the neighbour cell may not be overlapped with a paging occasion of the serving cell.
  • the third RAR window related to the third RACH occasion may not be overlapped with a paging occasion of the serving cell.
  • UE acquires the Random Access configuration of neighbour cell, i.e., information required to perform Random Access procedure to neighbour cell, which may include RACH occasion configuration, and/or Random Access Preamble configuration.
  • RACH occasion configuration i.e., information required to perform Random Access procedure to neighbour cell
  • Random Access Preamble configuration i.e., Random Access Preamble configuration.
  • Different RACH occasion/Random Access Preamble configuration can be configured for different purposes.
  • the UE selects a Random Access resource according to the Random Access configuration of neighbour cell received from the serving cell.
  • the UE selects an SSB with SS-RSRP above rsrp-ThresholdSSB. If no SSB with SS-RSRP above rsrp-ThresholdSSB is available, the UE selects any SSB of the neighbour cell.
  • the rsrp-ThresholdSSB is provided by the serving cell, e.g., via RA configuration of neighbour cell.
  • the UE selects a Random Access Preamble corresponding to the selected SSB, from the Random Access Preamble(s) determined according to the RA configuration of neighbour cell received from the serving cell.
  • the UE stops the ongoing Random Access procedure to the neighbour cell and initiates a new Random Access procedure to the serving cell.
  • Network can transmit SIB1 in on-demand manner to reduce power consumption required for SIB1 transmission. That is, network does not periodically transmit SIB1 and transmit it only when the SIB1 transmission is required by UE.
  • the UE receives the SIB1 request configuration from network.
  • the SIB1 request configuration includes a list of cells that transmit SIB1 in on-demand manner and/or the necessary details for requesting SIB1 transmission, e.g., RACH resources assigned for SIB1 request.
  • RACH resources assigned for SIB1 request.
  • a certain RACH resource is associated with a certain cell which supports the on-demand SIB1 transmission.
  • a UE When a UE needs to acquire SIB1 of a SIB1-less neighbour cell which supports on-demand SIB1, e.g., when the condition for SIB1 request is met, the UE initiates Random Access procedure to the SIB1-less neighbour cell. The UE selects a Random Access resource of the SIB1-less neighbour cell, which is associated with the SIB1 request. Then, the UE performs Random Access transmission using the selected Random Access resource.
  • the UE After transmitting the Random Access Preamble to the SIB1-less neighbour cell, the UE monitors the PDCCH of the SIB1-less neighbour cell for Random Access Response(s) identified by the RA-RNTI while the ra-ResponseWindow is running.
  • FIG. 14 shows an example of a method for resource selection for Random Access to neighbour cell.
  • FIG. 14 shows an example of a method performed by a UE in a wireless communication system.
  • step S1401 the UE in RRC_IDLE camps on cell #1, and receives the SIB1 request configuration of a neighbour cell from the serving cell, i.e., cell #1.
  • the SIB1 request configuration indicates dedicated RACH Occasions and dedicated preamble configuration for SIB1 request.
  • step S1402 the UE determines whether to request SIB1 transmission.
  • the UE selects a first available dedicated PRACH occasion for SIB1 request, which satisfies that the available PRACH occasion of the neighbour cell is not overlapped with the paging occasion of the serving cell, and/or the RAR window associated with the available PRACH occasion is not overlapped with the paging occasion of the serving cell.
  • step S1404 the UE transmits the selected Random Access Preamble to the neighbour cell using the selected RACH occasion.
  • step S1405 the UE receives a random access response from the neighbour cell.
  • step S1405 may be optional.
  • step S1406 the UE acquires SIB1 from the neighbour cell.
  • FIG. 15 shows an example of a method for resource selection for Random Access to neighbour cell.
  • the wireless device may camp on a first cell.
  • step S1505 the wireless device may select a first available PRACH occasion which satisfies following condition.
  • the available PRACH occasion is not overlapped with the paging occasion of the first cell;
  • the RAR window associated with the available PRACH occasion is not overlapped with the paging occasion of the first cell.
  • the wireless device may transmit the selected Random Access Preamble to the second cell using the selected first available PRACH occasion.
  • Some of the detailed steps shown in the examples of FIGS. 12 - 15 may not be essential steps and may be omitted. In addition to the steps shown in FIGS. 12 - 15, other steps may be added, and the order of the steps may vary. Some of the above steps may have their own technical meaning.
  • the apparatus may be a wireless device (100 or 200) in FIGS. 2, 3, 5, and 10.
  • a wireless device may perform methods described above.
  • the detailed description overlapping with the above-described contents could be simplified or omitted.
  • a wireless device 100 may include a processor 102, a memory 104, and a transceiver 106.
  • the processor 102 may be configured to be coupled operably with the memory 104 and the transceiver 106.
  • the wireless device may include 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, perform operations.
  • the operations further comprises: selecting a Synchronization Signal and PBCH block (SSB) of the neighbour cell.
  • SSB Synchronization Signal and PBCH block
  • the operations further comprises: acquiring a random access configuration of the neighbour cell including (i) information related to at least one RACH occasion for the neighbour cell and/or (ii) information related to at least one random access preamble for the neighbour cell.
  • the operations further comprises: receiving a system information block type 1 (SIB1) request configuration of the neighbour cell.
  • SIB1 system information block type 1
  • the SIB1 request configuration of the neighbour cell includes (i) information related to at least one RACH occasion of the neighbour cell and (ii) information related to at least one random access preamble for SIB1 request of the neighbour cell.
  • the operations further comprises: determining whether to request SIB1 transmission from the neighbour cell.
  • the random access preamble is transmitted for requesting SIB1 of the neighbour cell.
  • the operations further comprises: acquiring a SIB1 from the neighbour cell.
  • the operations further comprises: monitoring the paging occasion of the serving cell.
  • the neighbour cell transmits a SIB1 in on-demand manner.
  • the available RACH occasion is further selected based on the available RACH occasion being not overlapped with a paging occasion of the serving cell.
  • the operations further comprises: selecting a Synchronization Signal and PBCH block (SSB) of the neighbour cell.
  • SSB Synchronization Signal and PBCH block
  • the operations further comprises: selecting a random access preamble corresponding to the selected SSB.
  • the operations further comprises: acquiring a random access configuration of the neighbour cell including (i) information related to at least one RACH occasion for the neighbour cell and/or (ii) information related to at least one random access preamble for the neighbour cell.
  • the operations further comprises: receiving a system information block type 1 (SIB1) request configuration of the neighbour cell.
  • SIB1 system information block type 1
  • the SIB1 request configuration of the neighbour cell includes (i) information related to at least one RACH occasion of the neighbour cell and (ii) information related to at least one random access preamble for SIB1 request of the neighbour cell.
  • the operations further comprises: determining whether to request SIB1 transmission from the neighbour cell.
  • the random access preamble is transmitted for requesting SIB1 of the neighbour cell.
  • the operations further comprises: acquiring a SIB1 from the neighbour cell.
  • the operations further comprises: monitoring the paging occasion of the serving cell.
  • the neighbour cell transmits a SIB1 in on-demand manner.
  • the processor may be adapted to control the wireless device to be in communication with at least one of a user equipment, a network, or an autonomous vehicle other than the wireless device.
  • non-transitory computer-readable medium has stored thereon a plurality of instructions for selecting resource for random access to a neighbour cell, according to some embodiments of the present disclosure, will be described.
  • the technical features of the present disclosure could be embodied directly in hardware, in a software executed by a processor, or in a combination of the two.
  • a method performed by a wireless device in a wireless communication may be implemented in hardware, software, firmware, or any combination thereof.
  • a software may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other storage medium.
  • the computer-readable medium may include a tangible and non-transitory computer-readable storage medium.
  • non-transitory computer-readable media may include random access memory (RAM) such as synchronous dynamic random access memory (SDRAM), read-only memory (ROM), non-volatile random access memory (NVRAM), electrically erasable programmable read-only memory (EEPROM), FLASH memory, magnetic or optical data storage media, or any other medium that can be used to store instructions or data structures.
  • RAM random access memory
  • SDRAM synchronous dynamic random access memory
  • ROM read-only memory
  • NVRAM non-volatile random access memory
  • EEPROM electrically erasable programmable read-only memory
  • 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.
  • 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.
  • the available RACH occasion is further selected based on the available RACH occasion being not overlapped with a paging occasion of the serving cell.
  • the operations further comprises: selecting a Synchronization Signal and PBCH block (SSB) of the neighbour cell.
  • SSB Synchronization Signal and PBCH block
  • the operations further comprises: selecting a random access preamble corresponding to the selected SSB.
  • the operations further comprises: acquiring a random access configuration of the neighbour cell including (i) information related to at least one RACH occasion for the neighbour cell and/or (ii) information related to at least one random access preamble for the neighbour cell.
  • the SIB1 request configuration of the neighbour cell includes (i) information related to at least one RACH occasion of the neighbour cell and (ii) information related to at least one random access preamble for SIB1 request of the neighbour cell.
  • the operations further comprises: determining whether to request SIB1 transmission from the neighbour cell.
  • the random access preamble is transmitted for requesting SIB1 of the neighbour cell.
  • the operations further comprises: acquiring a SIB1 from the neighbour cell.
  • the operations further comprises: monitoring the paging occasion of the serving cell.
  • the neighbour cell transmits a SIB1 in on-demand manner.
  • the stored a plurality of instructions may cause the wireless device to be in communication with at least one of a user equipment, a network, or an autonomous vehicle other than the wireless device.
  • BS base station
  • the method comprises: receiving, by a base station from a wireless device, a random access preamble for a neighbour cell based on an available random access channel (RACH) occasion occasion.
  • the wireless device selects a serving cell.
  • the wireless device initiates a random access procedure to a neighbour cell.
  • the wireless device selects the available RACH occasion based on a random access response (RAR) window related to the available RACH occasion being not overlapped with a paging occasion of the serving cell.
  • RACH random access channel
  • BS base station
  • the BS may include a transceiver, a memory, and a processor operatively coupled to the transceiver and the memory.
  • the processor may be adapted to control the transceiver to receive, from a wireless device, a random access preamble for a neighbour cell based on an available random access channel (RACH) occasion occasion.
  • the wireless device selects a serving cell.
  • the wireless device initiates a random access procedure to a neighbour cell.
  • the wireless device selects the available RACH occasion based on a random access response (RAR) window related to the available RACH occasion being not overlapped with a paging occasion of the serving cell.
  • RAR random access response
  • the present disclosure can have various advantageous effects.
  • the wireless device could efficiently select resource for random access to a neighbour cell.
  • the UE can monitor the serving cell during paging occasion and does not miss paging, by selecting PRACH occasion of the neighbour cell which is not overlapped with the paging occasion of the serving cell.
  • the wireless communication system could provide an efficient solution for selecting resource for random access to a neighbour cell.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un appareil de sélection de ressource pour un accès aléatoire à une cellule voisine. Un dispositif sans fil sélectionne une cellule de desserte. Le dispositif sans fil lance une procédure d'accès aléatoire à une cellule voisine. Le dispositif sans fil sélectionne une occasion de RACH disponible sur la base d'une fenêtre de RAR associée à l'occasion de RACH disponible qui n'est pas chevauchée par une occasion de radiomessagerie de la cellule de desserte. Le dispositif sans fil transmet, à la cellule voisine, un préambule d'accès aléatoire sur la base de l'occasion de RACH disponible.
PCT/KR2025/003772 2024-03-28 2025-03-25 Procédé et appareil de sélection de ressource pour un accès aléatoire à une cellule voisine Pending WO2025206696A1 (fr)

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US20200260499A1 (en) * 2019-02-07 2020-08-13 Qualcomm Incorporated Signaling of transmission parameters
US20220248369A1 (en) * 2019-06-05 2022-08-04 Lenovo (Beijing) Limited Method and apparatus for handling paging collisions
US20220279425A1 (en) * 2019-09-16 2022-09-01 Telefonaktiebolaget Lm Ericsson (Publ) Enhanced On-Demand Request Procedures for Obtaining Various System Information
US20240080901A1 (en) * 2021-04-01 2024-03-07 Qualcomm Incorporated Selecting synchronization beams to reduce latency

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190394749A1 (en) * 2018-06-21 2019-12-26 Qualcomm Incorporated Paging configuration in beamformed wireless communications
US20200260499A1 (en) * 2019-02-07 2020-08-13 Qualcomm Incorporated Signaling of transmission parameters
US20220248369A1 (en) * 2019-06-05 2022-08-04 Lenovo (Beijing) Limited Method and apparatus for handling paging collisions
US20220279425A1 (en) * 2019-09-16 2022-09-01 Telefonaktiebolaget Lm Ericsson (Publ) Enhanced On-Demand Request Procedures for Obtaining Various System Information
US20240080901A1 (en) * 2021-04-01 2024-03-07 Qualcomm Incorporated Selecting synchronization beams to reduce latency

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