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WO2025171919A1 - Accès aléatoire - Google Patents

Accès aléatoire

Info

Publication number
WO2025171919A1
WO2025171919A1 PCT/EP2024/086120 EP2024086120W WO2025171919A1 WO 2025171919 A1 WO2025171919 A1 WO 2025171919A1 EP 2024086120 W EP2024086120 W EP 2024086120W WO 2025171919 A1 WO2025171919 A1 WO 2025171919A1
Authority
WO
WIPO (PCT)
Prior art keywords
rach
slots
sbfd
random access
occasions
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/EP2024/086120
Other languages
English (en)
Inventor
Erika PORTELA LOPES DE ALMEIDA
Nhat-Quang NHAN
Karim KASAN
Juha Sakari Korhonen
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.)
Nokia Technologies Oy
Original Assignee
Nokia Technologies Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nokia Technologies Oy filed Critical Nokia Technologies Oy
Publication of WO2025171919A1 publication Critical patent/WO2025171919A1/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
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal

Definitions

  • the present disclosure relates to wireless cellular communication.
  • Random access channel, RACH, processes also known as random access processes, are used in wireless communication to access the communication network.
  • a user equipment, UE in idle mode may use a random access process to request transition to connected mode with respect to the communication network.
  • RACH processes may have, for example, two messaging steps or four messaging steps.
  • a RACH process may be contention based, or contention free.
  • a contention-based RACH process begins with the UE transmitting to the network an initial signal, such as a RACH preamble.
  • the UE will transmit the initial signal using at least one RACH occasion, RO, which comprises time and frequency resources.
  • the initial signal is sent using a physical random access channel, PRACH.
  • an apparatus comprising at least one processing core and at least one memory storing instructions that, when executed by the at least one processing core, cause the apparatus at least to process, while in idle mode, information received from a network, the information indicating which slots from a sequence of subband non-overlapping full duplex, SBFD, slots contain at least one random access channel, RACH, occasion, a frequency start value of the at least one RACH occasion and an extent of frequency multiplexing of the at least one RACH occasion, determine, based at least in part on the information received from the network, a set of RACH occasions for initiating a random access procedure, wherein the set of RACH occasions are in SBFD uplink subband, and initiate the random access procedure using at least one RACH occasion from among the set of RACH occasions.
  • an apparatus comprising at least one processing core and at least one memory storing instructions that, when executed by the at least one processing core, cause the apparatus at least to broadcast in a cell controlled by the apparatus information indicating which slots from a sequence of subband non-overlapping full duplex, SBFD, slots contain at least one random access channel, RACH, occasion, a frequency start value of the at least one RACH occasion, and an extent of frequency multiplexing of the at least one RACH occasion, and receive an initial random access signal from a user equipment using at least one RACH occasion from among a set of RACH occasions indicated by the broadcasted information.
  • a method comprising processing, by an apparatus and while in idle mode, information received from a network, the information indicating which slots from a sequence of subband non-overlapping full duplex, SBFD, slots contain at least one random access channel, RACH, occasion, a frequency start value of the at least one RACH occasion and an extent of frequency multiplexing of the at least one RACH occasion, determining, based at least in part on the information received from the network, a set of RACH occasions for initiating a random access procedure, wherein the set of RACH occasions are in SBFD uplink subband, and initiating the random access procedure using at least one RACH occasion from among the set of RACH occasions.
  • a method comprising processing, by an apparatus and while in idle mode, information received from a network, the information indicating frequency domain resource allocation of at least one set of random access channel, RACH, occasions in uplink only slots of a time division duplex, TDD, carrier, and which slots from a sequence of subband non-overlapping full duplex, SBFD, slots of the TDD carrier contain at least one random access channel, RACH, occasion, determining, based at least in part on the information received from the network, a set of RACH occasions for initiating a random access procedure, wherein the set of RACH occasions are in SBFD uplink subband, and initiating the random access procedure using at least one valid RACH occasion from among the set of RACH occasions.
  • FIGURE 1 illustrates an example system in accordance with at least some embodiments of the present invention
  • FIGURE 4 illustrates an example duplexing scenario in accordance with at least some embodiments of the present invention
  • FIGURE 8 illustrates an example apparatus capable of supporting at least some embodiments of the present invention
  • FIGURE 9 is a flowchart of a method in accordance with at least some embodiments of the present invention.
  • FIGURES 11 - 16 are flow graphs of methods in accordance with at least some embodiments of the present invention.
  • the SBFD symbol contains a DL subband and an UL subband, therefore some extension on the legacy indications may be used for the UE to be able to locate the ROs in SBFD symbols.
  • the ROs do not overlap with the SBFD UL subbands due to applying the legacy time and frequency configurations RACH-ConfigGeneric designed for UL-only symbols on the SBFD symbols. Accordingly, since the ROs are not contained in the UL subband of the SBFD symbol, the ROs should not be deemed valid. Additional indications from the network to the UE may be considered to assist in locating the ROs on SBFD symbols.
  • SBFD RACH indications to be used by SBFD-aware UEs to perform random access in SBFD symbols.
  • These indications may be signaled, for example, via RACH-ConfigGeneric embedded in RACH-ConfigCommon in the ServingCellConfigCommonSIB for RRC-Idle mode, or those indication may be signaled in a dedicated RRC message for RRC-Connected mode UEs.
  • the UE may implicitly assume that the received SBFD RACH indications apply to ROs colliding or overlapping with SBFD symbols, e.g. SBFD UL subband. ROs overlapping with SBFD UL subband may be considered as valid ROs or deemed as valid. Alternatively, an explicit indication of the valid ROs can be included in the SBFD RACH configuration.
  • SBFD symbols and UL sub-band are valid for SBFD-aware UE.
  • SBFD symbols apart from the time domain aspect, it may be possible that not all resources within the UL sub-band are available for PRACH transmission. This may help gNB to control the resources and reduce complexity when needed.
  • FIGURE 1 illustrates an example system in accordance with at least some embodiments of the present invention.
  • This system includes base stations 130, 135 in communication with UEs, such as UE 110.
  • a radio link connects base station 130 with UE 110.
  • the radio link may be bidirectional, comprising an uplink, UL, to convey information from UE 110 toward base station 130, and a downlink, DL, to convey information from the base station 130 toward UE 110.
  • a cellular communication system may comprise hundreds or thousands of base stations, of which only two are illustrated in FIGURE 1 for the sake of clarity of the illustration.
  • the base stations may be distributed in that they comprise a centralized unit, CU, and one or more distributed unit, DU.
  • a base station is an example of a base node.
  • Base station 130 is further coupled communicatively with core network node 140, which may comprise, for example, a mobility management entity, MME, or access and mobility management function, AMF.
  • the core network node 140 may be coupled with further core network nodes, and with a network 150, which may comprise the Internet or a corporate network, for example.
  • the system may communicate with further networks via network 150.
  • Examples of the further core network nodes which are not illustrated in FIGURE 1 for the sake of clarity, include gateways and subscriber information repositories.
  • Core network nodes may be virtualized in the sense that they may run as software modules on computing substrates, such that more than one virtualized network node may run on a same computing substrate.
  • a UE such as UE 110
  • RAN radioaccess network
  • An idle-mode UE may be identified by non-access stratum, NAS, identities.
  • the RAN has no information of its own concerning idlemode UEs and base stations of a RAN can only address idle mode UEs in a cell by broadcasting information or sending paging messages during paging occasions.
  • base stations of the RAN do not store a UE context of an idle-mode UE and there is no NAS signalling connection between the idle mode UE and the network.
  • a UE context, stored by the base station for connected mode UEs, comprises associations between the UE and identities of logical connections used for messages associated with this UE.
  • UE context is, in other words, needed to maintain active RAN services toward the UE.
  • the UE may be left un-informed of the subbands for UL and DL during SBFD, since the UE doesn’t need to know what the DL subband is, for example, or what is the entire extent of the UL subband, to use ROs in the UL subband of an SBFD slot.
  • the ROs indicated to the UE should overlap an UL subband of the SBFD slot(s) since the network will not be listening to UL transmission on the DL subband, or on a guard band separating the UL and DL subbands.
  • the network may inform the UE of ROs in SBFD slots.
  • time and frequency domain allocations of all ROs may be sent to the UE explicitly.
  • the base station may inform the idle mode UE concerning which slots in a TDD slot sequence are SBFD slots, and/or define the UL/DL subbands in the frequency domain in these SBFD slots.
  • This information together, namely the information on which slots of a TDD slot sequence are SBFD slots and the UL/DL subband indications, forms an SBFD configuration, also known as an SBFD time and frequency configuration.
  • the network may provide to a UE information on SBFD in two stages, for example in case SBFD-slot ROs are not defined explicitly and/or the SBFD configuration is not provided to the UE.
  • the base station may provide limited and incomplete information, which is sufficient for the UE to determine a set of ROs in SBFD slots to use in a RA process, and secondly, when the UE is, as a consequence of the RA process, in the connected mode, the base station may provide the whole SBFD time and frequency configuration.
  • the first phase may omit informing the idle mode UE of the UL and DL subbands in SBFD slots, and the second phase may then comprise informing the UE, by this time in connected mode, of these.
  • the first phase indicates to the UE time and frequency locations of ROs in the SBFD slots, which is all the UE needs to know to use these ROs.
  • the UE may be configured to assume that a preconfigured number of slots before a first flexible or UL slot in a TDD pattern are valid for PRACH transmissions.
  • the preconfigured number for example one, may be either configured by the network, or specified in the specification (pre-configured).
  • the base station to provide to the UE a frequency offset from a beginning (initial), center or end of the used frequency band on the carrier to a start, midpoint or end of the UL subband or RO group in the SBFD slots.
  • the frequency offset may be defined from a reference frequency.
  • the base station provides to the UE a multiplexing configuration applicable to SBFD symbols or slots, and according to a second one, the base station provides to the UE a bitmap which indicates which ROs of the UL-slot ROs are also valid at a different time instance in SBFD slots.
  • a bit width of the bitmap may be equal to a multiplexing indication relating to ROs in an UL slot.
  • the UE may be configured to consider that a predetermined number of slots before an uplink, or flexible, slot contain ROs the idle mode UE may use. In other words, the ROs which overlap with these predetermined number of slots are also valid regardless of the slot type.
  • the predetermined number may be configured in SIB1 or specified in specification. For example, it may be equal to one or two.
  • the UE When the UE is later in connected mode, it may be configured with a number of SBFD slots that could be greater than or equal to the predetermined number.
  • the UE may assume that the same configuration as in UL symbols is valid in SBFD symbols too, and skips this step. It may also be assumed that the UE gets information about the frequency domain resource allocation for ROs in UL slots/symbols and derives the frequency domain resource allocation for ROs in SBFD symbols based on additional information received from the network.
  • the base station may provide to the UE a frequency offset from a beginning, center or end of the used frequency band on the carrier to a start, midpoint or end of the UL subband in the SBFD slots.
  • the UE may receive from the network an indication of whether the UL subband is configured in the edge or center of the carrier.
  • the UL subband may be indicated as being in the lower edge, center or upper edge of the carrier. This can be indicated using two bits in broadcasted information, for example: 00 indicating a lower edge, 01 indicating the center and 10 indicating an upper edge.
  • the UE may then determine how the frequency resources for the ROs in SBFD symbols are mapped, based on the configuration of the ROs in UL symbols.
  • the determination may be either fixed in the specification, that is, a pre-defined frequency offset to be applied to a reference RB in the BWP, depending on the location indication, such as: the first RB in the Initial BWP (lower edge), last RB in the Initial BWP (upper edge) or the center RB in the initial BWP (center).
  • the gNB may configure a frequency offset.
  • a second option for the indication of start frequency of the SBFD slot ROs is to provide a frequency offset from a group of ROs in an UL slot to ROs in an SBFD slot.
  • a second option for the indication of the extent of frequency multiplexing of the SBFD slot ROs is the base station providing to the UE a bitmap which indicates which ROs of the UL-slot ROs are valid at a time instance in SBFD slot(s).
  • the bitmap may have the same width as Msgl -FDM, or in general a message defining frequency multiplexing of ROs in UL-only slots.
  • the least significant bit in the bitmap may correspond to the RO mapped to the lowest frequency, for example.
  • the network may ensure by implementation that at least one RO in the Msgl -FDM frequency multiplexed ROs overlaps with a UL subband.
  • the bandwidth occupied by the UL-slot ROs may be larger than the UL subband.
  • the ROs located outside of the UL subband in frequency domain may be indicated by 0 in the bitmap, and the ROs overlapping with the UL subband in frequency domain may be indicated by 1 in the bitmap. Then, the ROs indicated by 1 are valid Msgl-FDM ROs in the UL subband.
  • the UE may be configured to assume that the same configuration as is used in multiplexing ROs in UL symbols is valid in SBFD symbols.
  • Slots 310 are SBFD slots wherein are found at least one RO in the UL subband. Indicating these slots to the UE amounts to indicating valid SBFD ROs in the time domain. Valid SBFD ROs are ROs overlapping with the UL subband.
  • Frequency domain allocation 320 represents an extent in frequency domain of valid ROs in SBFD slots which are available to the UE. In the case of FIGURE 3, the base station does not inform idle-mode UEs which slots are SBFD slots, and neither does the base station inform idle-mode UEs of the frequency domain allocation of SBFD subbands, e.g. of the edges of UL and DL subbands in SBFD.
  • the base station does inform the idlemode UEs of the time and frequency domain allocations of ROs valid in SBFD slots.
  • the UE may be informed that the last two slots before an uplink slot have valid ROs, that the lower frequency bound of these valid ROs starts from the same frequency as the ROs in the UL slot, that is, a frequency offset between UL and SBFD slot ROs is zero, and that SBFD slot ROs are frequency multiplexed by a factor of three.
  • the UE may be informed that the UL ROs are multiplexed by a factor of four and the valid ROs for SBFD slots may be indicated with a bitmap 0111. This information is enough for the UE to determine the valid non-UL slot ROs, shaded black in FIGURE 3. The UE may then use one of these ROs to initiate a RA process with the base station.
  • FIGURE 4 illustrates an example duplexing scenario in accordance with at least some embodiments of the present invention.
  • Like numbering and hatching denotes like structure as in FIGURE 3.
  • the case of FIGURE 4 differs from that in FIGURE 3 in that the base station only provides to the UE information concerning which slots have SBFD ROs, the base station does not define where in frequency domain these ROs are to be found.
  • the UE is configured to, in this situation, re-use the frequency allocation of ROs in the UL (or flexible) slot, which is in this case appropriate since these ROs fall on the UL subband of the SBFD slots.
  • the UE need not know the upper or lower edge of the UL subband to use these ROs, the implicit indication of the location of the ROs in frequency domain is enough. Conserving the indication results in conserved energy, a major consideration in operating wireless communication networks.
  • FIGURE 6 illustrates an example duplexing scenario in accordance with at least some embodiments of the present invention.
  • This scenario resembles that in FIGURE 5, however with the difference that unlike in the scenario of FIGURE 5, the frequency allocation of the SBFD slot ROs is not indicated to the idle mode UE, which is then configured to assume that the same frequency allocation of ROs as is present in the UL slot is also applied to SBFD slots with ROs - which is in this case appropriate, as such ROs fall within the SBFD slot UL subband.
  • the SBFD configuration is provided to idle mode UEs in broadcasted information, including both the knowledge of which slots in the TDD slot sequence are SBFD slots and the SBFD UL subband in these slots.
  • FIGURE 7 illustrates an example duplexing scenario in accordance with at least some embodiments of the present invention.
  • the base station is configured to include in broadcasted information provided to idle mode UEs the definition of which slots of the TDD pattern areSBFD slots 510, and the definition of the UL subband of these slots 520.
  • the frequency allocation 320 of the SBFD slot ROs is provided to idle mode UEs.
  • the UE may in such a situation assume, that SBFD slot ROs are present in all SBFD slots within the defined frequency range 320, and select at least one of these ROs in the UL slot(s), for a RA process.
  • both 5 and 6 of the above are configured without 1 - 2 or 3 - 4.
  • only 5 is configured, without 1 - 2 or 3 - 4 or 6.
  • only configurations 3, 4, 5 and 6 are sent to idle mode UE.
  • only configurations 3, 4 and 5 are sent to idle mode UE and in the scenario of FIGURE 7, only configurations 3, 4 and 6 are sent to the idle mode UE.
  • FIGURE 8 illustrates an example apparatus capable of supporting at least some embodiments of the present invention.
  • device 800 which may comprise, for example, a mobile communication device such as UE 110 of FIGURE 1.
  • processor 810 which may comprise, for example, a single- or multi-core processor wherein a single-core processor comprises one processing core and a multi-core processor comprises more than one processing core.
  • Processor 810 may comprise, in general, a control device.
  • Processor 810 may comprise more than one processor.
  • device 800 may be a distributed device wherein processing of tasks takes place in more than one physical unit.
  • Processor 810 may be a control device.
  • a processing core may comprise, for example, a Cortex-A8 processing core manufactured by ARM Holdings or a Zen processing core designed by Advanced Micro Devices Corporation.
  • a processing core or processor may be, or may comprise, at least one qubit.
  • Processor 810 may comprise at least one Qualcomm Snapdragon and/or Intel Atom processor.
  • Processor 810 may comprise at least one application-specific integrated circuit, ASIC.
  • Processor 810 may comprise at least one field-programmable gate array, FPGA.
  • Processor 810 optionally together with memory and computer instructions, may be means for performing method steps in device 800, such as processing, determining, initiating, broadcasting and receiving.
  • Processor 810 may be configured, at least in part by computer instructions, to perform actions.
  • a processor may comprise circuitry, or be constituted as circuitry or circuitries, the circuitry or circuitries being configured to perform phases of methods in accordance with embodiments described herein.
  • circuitry may refer to one or more or all of the following: (a) hardware-only circuit implementations, such as implementations in only analogue and/or digital circuitry, and (b) combinations of hardware circuits and software, such as, as applicable: (i) a combination of analogue and/or digital hardware circuit(s) with software/firmware and (ii) any portions of hardware processor(s) with software (including digital signal processor(s)), software, and memory(ies) that work together to cause an apparatus, such as a UE or base station, to perform various functions) and (c) hardware circuit(s) and or processor(s), such as a microprocessor s) or a portion of a microprocessor s), that requires software (e.g., firmware) for operation, but the software may not be present when it is not
  • circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.
  • Device 800 may comprise memory 820.
  • Memory 820 may comprise random-access memory and/or permanent memory.
  • Memory 820 may comprise at least one RAM chip.
  • Memory 820 may be a computer readable medium.
  • Memory 820 may comprise solid-state, magnetic, optical and/or holographic memory, for example.
  • Memory 820 may be at least in part accessible to processor 810.
  • Memory 820 may be at least in part comprised in processor 810.
  • Memory 820 may be means for storing information.
  • Memory 820 may comprise computer instructions that processor 810 is configured to execute.
  • processor 810 and/or its at least one processing core may be considered to be configured to perform said certain actions.
  • Memory 820 may be at least in part external to device 800 but accessible to device 800.
  • Memory 820 may be transitory or non- transitory.
  • non-transitory is a limitation of the medium itself (that is, tangible, not a signal) as opposed to a limitation on data storage persistency (for example, RAM vs. ROM).
  • Device 800 may comprise a transmitter 830.
  • Device 800 may comprise a receiver 840.
  • Transmitter 830 and receiver 840 may be configured to transmit and receive, respectively, information in accordance with at least one cellular or non-cellular standard.
  • Transmitter 830 may comprise more than one transmitter.
  • Receiver 840 may comprise more than one receiver.
  • Transmitter 830 and/or receiver 840 may be configured to operate in accordance with global system for mobile communication, GSM, wideband code division multiple access, WCDMA, 5G, long term evolution, LTE, IS-95, wireless local area network, WLAN, Ethernet and/or worldwide interoperability for microwave access, WiMAX, standards, for example.
  • Device 800 may comprise a near-field communication, NFC, transceiver 850.
  • NFC transceiver 850 may support at least one NFC technology, such as NFC, Bluetooth, Wibree or similar technologies.
  • Device 800 may comprise user interface, UI, 860.
  • UI 860 may comprise at least one of a display, a keyboard, a touchscreen, a vibrator arranged to signal to a user by causing device 800 to vibrate, a speaker or a microphone.
  • a user may be able to operate device 800 via UI 860, for example to accept incoming telephone calls, to originate telephone calls or video calls, to browse the Internet, to manage digital files stored in memory 820 or on a cloud accessible via transmitter 830 and receiver 840, or via NFC transceiver 850, and/or to play games.
  • Device 800 may comprise further devices not illustrated in FIGURE 8.
  • device 800 may comprise at least one digital camera.
  • Some devices 800 may comprise a back-facing camera and a front-facing camera, wherein the back-facing camera may be intended for digital photography and the frontfacing camera for video telephony.
  • Device 800 may comprise a fingerprint sensor arranged to authenticate, at least in part, a user of device 800.
  • device 800 lacks at least one device described above.
  • some devices 800 may lack a NFC transceiver 850 and/or user identity module 870.
  • Processor 810, memory 820, transmitter 830, receiver 840, NFC transceiver 850, UI 860 and/or user identity module 870 may be interconnected by electrical leads internal to device 800 in a multitude of different ways.
  • each of the aforementioned devices may be separately connected to a master bus internal to device 800, to allow for the devices to exchange information.
  • this is only one example and depending on the embodiment various ways of interconnecting at least two of the aforementioned devices may be selected without departing from the scope of the present invention.
  • phase 920 determines that the system information does contain information on UL subband ROs
  • processing advances from phase 920 to phase 940, where the time and frequency locations of the UL subband, that is SBFD-slot, ROs are determined based at least in part on the information broadcasted by the base station and read by the idle mode UE in phase 910.
  • phase 950 a random access process is performed, the random access process being initiated using at least one of the UL subband ROs.
  • the UE may initiate the random access process using a next available or next possible RO.
  • the next available RO may be a legacy UL RO, or an SBFD slot RO.
  • the base station provides the SBFD configuration including the definitions of the UL subband and DL subband.
  • the SBFD configuration may be referred to as a full SBFD configuration.
  • base station 1030 broadcasts system information which comprises indications relating to the SBFD slot ROs, which have been described herein above.
  • idle mode UE 110 determines, based on the indications in the broadcasted system information, a set of SBFD slot ROs, as described herein above.
  • the set of SBFD slot ROs may comprise one or more ROs.
  • the set may comprise one RO.
  • the set may comprise a plurality of ROs.
  • FIGURE 13 is a flow graph of a method in accordance with at least some embodiments of the present invention.
  • the phases of the illustrated method may be performed in UE 110, or in a control device configured to control the functioning thereof, when installed therein.
  • Phase 1410 comprises broadcasting, in a cell controlled by an apparatus performing the method, information indicating which slots from a sequence of subband non-overlapping full duplex, SBFD, slots contain at least one random access channel, RACH, occasion, a frequency start value of the at least one RACH occasion; and an extent of frequency multiplexing of the at least one RACH occasion by one of 1) indicating a number of multiplexed RACH occasions in SBFD slots, or 2) a bitmap indicating which RACH occasions of an uplink slot are also valid in SBDF slots.
  • Phase 1420 comprises receiving an initial random access signal from a user equipment using at least one RACH occasion from among a set of RACH occasions indicated by the broadcasted information.
  • Phase 1520 comprises determining, based at least in part on the information received from the network, a set of RACH occasions for initiating a random access procedure, wherein the set of RACH occasions are in SBFD uplink subband.
  • Phase 1530 comprises initiating the random access procedure using at least one valid RACH occasion from among the set of RACH occasions.
  • FIGURE 16 is a flow graph of a method in accordance with at least some embodiments of the present invention.
  • the phases of the illustrated method may be performed in base station 130, or in a control device configured to control the functioning thereof, when installed therein.
  • Phase 1610 comprises broadcasting, in a cell controlled by an apparatus performing the method, information indicating frequency domain resource allocation of at least one set of random access channel, RACH, occasions in uplink only slots of a time division duplex, TDD, carrier, and which slots from a sequence of subband nonoverlapping full duplex, SBFD, slots of the TDD carrier contain at least one random access channel, RACH, occasion.
  • phase 1620 comprises receiving an initial random access signal from a user equipment using at least one RACH occasion from among a set of RACH occasions indicated by the broadcasted information.
  • Example 1 An apparatus comprising at least one processing core and at least one memory storing instructions that, when executed by the at least one processing core, cause the apparatus at least to:
  • Example 2 initiate the random access procedure using at least one RACH occasion from among the set of RACH occasions.
  • Example 2 An apparatus according to Example 1, further configured to receive, while in connected mode, an SBFD time and frequency domain configuration.
  • Example 3 The apparatus according to Example 1 or 2, wherein the information received from the network indicates which slots from the sequence of SBFD slots contain at least one RACH occasion by one of:
  • ⁇ indicating an uplink or flexible slot, before which a predetermined number of slots contain RACH occasions
  • ⁇ indicating a reference slot and a last uplink or flexible slot, wherein slots between the reference slot and the last uplink or flexible slot contain RACH occasions;
  • ⁇ indicating a bitmap indicating the SBFD slots containing at least one RACH occasion.
  • Example 4 The apparatus according to any of Examples 1 - 3, wherein the information received from the network indicates the frequency start value of the at least one RACH occasion by:
  • ⁇ indicating an initial frequency of an uplink sub-band in a carrier and a frequency offset from the initial frequency to a first RACH occasion, or by
  • ⁇ indicating a frequency offset between RACH occasion in uplink slots and RACH occasions in SBFD slots.
  • Example 7 The apparatus according to any of Examples 1 - 6, further configured to receive, when in the idle mode, a time domain allocation of the sequence of SBFD slots from the network.
  • Example 8 The apparatus according to any of Examples 1 - 7, further configured to receive, when in the idle mode, a frequency domain allocation SBFD subbands for the sequence of SBFD slots from the network.
  • Example 9 An apparatus comprising at least one processing core and at least one memory storing instructions that, when executed by the at least one processing core, cause the apparatus at least to:
  • Example 10 An apparatus according to Example 9, further configured to provide to a user equipment which is in connected mode, an SBFD time and frequency domain configuration.
  • Example 11 The apparatus according to Example 9 or 10, wherein the broadcasted information indicates which slots from the sequence of SBFD slots contain at least one RACH occasion by one of:
  • Example 12 The apparatus according to any of Examples 9 - 11, wherein the broadcasted information indicates the frequency start value of the at least one RACH occasion by: ⁇ indicating an initial frequency of an uplink sub-band in a carrier and a frequency offset from the initial frequency to a first RACH occasion, or by
  • Example 14 A method comprising:
  • Example 15 A method comprising:
  • Example 17 A non-transitory computer readable medium having stored thereon a set of computer readable instructions that, when executed by at least one processor, cause an apparatus to at least:
  • Example 18 An apparatus comprising at least one processing core and at least one memory storing instructions that, when executed by the at least one processing core, cause the apparatus at least to:
  • ⁇ indicating an uplink or flexible slot, before which a predetermined number of slots contain RACH occasions
  • Example 21 The apparatus according to any of Examples 18 - 20, wherein the information received from the network indicates the frequency start value of the at least one RACH occasion by:
  • Example 22 The apparatus according to any of Examples 18 - 21, wherein the information received from the network is received in a broadcasted system information block while the apparatus is in idle mode.
  • Example 23 The apparatus according to any of Examples 18 - 22, wherein the SBFD slots are on a time division duplex, TDD, carrier.
  • Example 24 The apparatus according to any of Examples 18 - 23, further configured to receive, when in the idle mode, a time domain allocation of the sequence of SBFD slots from the network.
  • Example 25 The apparatus according to any of Examples 18 - 24, further configured to receive, when in the idle mode, a frequency domain allocation SBFD subbands for the sequence of SBFD slots from the network.
  • Example 26 An apparatus comprising at least one processing core and at least one memory storing instructions that, when executed by the at least one processing core, cause the apparatus at least to:
  • the apparatus information indicating: o which slots from a sequence of subband non-overlapping full duplex, SBFD, slots contain at least one random access channel, RACH, occasion; o a frequency start value of the at least one RACH occasion, and o an extent of frequency multiplexing of the at least one RACH occasion by one of:
  • Example 27 An apparatus according to Example 26, further configured to provide to a user equipment which is in connected mode, an SBFD time and frequency domain configuration.
  • Example 28 The apparatus according to Example 26 or 27, wherein the broadcasted information indicates which slots from the sequence of SBFD slots contain at least one RACH occasion by one of:
  • ⁇ indicating an uplink or flexible slot, before which a predetermined number of slots contain RACH occasions
  • ⁇ indicating a reference slot and a last uplink or flexible slot, wherein slots between the reference slot and the last uplink or flexible slot comprise RACH occasions;
  • ⁇ indicating a bitmap indicating the SBFD slots containing at least one RACH occasion.
  • Example 29 The apparatus according to any of Examples 26 - 28, wherein the broadcasted information indicates the frequency start value of the at least one RACH occasion by:
  • ⁇ indicating an initial frequency of an uplink sub-band in a carrier and a frequency offset from the initial frequency to a first RACH occasion, or by
  • ⁇ indicating a frequency offset between RACH occasion in uplink slots and RACH occasions in SBFD slots.
  • Example 30 The apparatus according to any of Example 26 - 29, wherein the apparatus is configured to broadcast the broadcasted information in a system information block.
  • Example 3 E A method comprising:
  • Example 33 A non-transitory computer readable medium having stored thereon a set of computer readable instructions that, when executed by at least one processor, cause an apparatus to at least:
  • Example 35 An apparatus comprising at least one processing core and at least one memory storing instructions that, when executed by the at least one processing core, cause the apparatus at least to:
  • the information indicating: o frequency domain resource allocation of at least one set of random access channel, RACH, occasions in uplink only slots of a time division duplex, TDD, carrier, and o which slots from a sequence of subband non-overlapping full duplex, SBFD slots of the TDD carrier contain at least one random access channel, RACH, occasion;
  • Example 36 An apparatus according to Example 35, further configured to receive, while in connected mode, an SBFD time and frequency domain configuration.
  • Example 37 The apparatus according to Example 35 or 36, wherein the information received from the network indicates which slots from the sequence of SBFD slots contain at least one RACH occasion by one of:
  • ⁇ indicating an uplink or flexible slot, before which a predetermined number of slots contain RACH occasions
  • ⁇ indicating a reference slot and a last uplink or flexible slot, wherein slots between the reference slot and the last uplink or flexible slot contain RACH occasions;
  • ⁇ indicating a bitmap indicating the SBFD slots containing at least one RACH occasion.
  • Example 38 The apparatus according to any of Examples 35 - 37, wherein the frequency domain allocation of the at least one set of RACH occasions in uplink slots is used for the set of RACH occasions in the SBFD uplink subband.
  • Example 39 The apparatus according to any of Examples 35 - 37, wherein the information received from the network indicates a frequency start value of the at least one RACH occasion in the SBFD uplink subband and the apparatus is caused to perform: using an extent of frequency multiplexing of the at least one set of RACH occasions in uplink slots for the set of RACH occasions in the SBFD uplink subband.
  • Example 40 The apparatus according to any of Examples 35 - 37, wherein the information received from the network indicates an extent of frequency multiplexing of the at least one RACH occasion in the SBFD uplink subband; and the apparatus is caused to perform: using a frequency start value of the at least one set of RACH occasions in uplink slots for the set of RACH occasions in the SBFD uplink subband.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Selon un aspect donné à titre d'exemple de la présente invention, l'invention concerne un appareil conçu pour traiter, pendant qu'il est en mode veille, des informations reçues en provenance d'un réseau, les informations indiquant l'attribution de ressources de domaine fréquentiel d'au moins un ensemble d'occasions de canal d'accès aléatoire, RACH, dans des créneaux uniquement de liaison montante d'une porteuse de duplexage par répartition dans le temps, TDD, et indiquant les créneaux parmi une séquence de créneaux de duplexage intégral sans chevauchement de sous-bande, SBFD, de la porteuse TDD qui contiennent au moins une occasion de canal d'accès aléatoire, RACH, déterminer, sur la base, au moins en partie, des informations reçues en provenance du réseau, un ensemble d'occasions RACH destinées à initier une procédure d'accès aléatoire, l'ensemble d'occasions RACH étant dans une sous-bande de liaison montante SBFD, et initier la procédure d'accès aléatoire à l'aide d'au moins une occasion RACH valide parmi l'ensemble d'occasions RACH.
PCT/EP2024/086120 2024-02-16 2024-12-13 Accès aléatoire Pending WO2025171919A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230054111A1 (en) * 2021-08-04 2023-02-23 Samsung Electronics Co., Ltd. Random access procedure for full-duplex operation
WO2024035329A1 (fr) * 2022-08-12 2024-02-15 Telefonaktiebolaget Lm Ericsson (Publ) Canal physique d'accès aléatoire (prach) pour fonctionnement en duplex intégral de sous-bande

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230054111A1 (en) * 2021-08-04 2023-02-23 Samsung Electronics Co., Ltd. Random access procedure for full-duplex operation
WO2024035329A1 (fr) * 2022-08-12 2024-02-15 Telefonaktiebolaget Lm Ericsson (Publ) Canal physique d'accès aléatoire (prach) pour fonctionnement en duplex intégral de sous-bande

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