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WO2025196127A1 - Procédé de planification pour dispositifs ido ambiants - Google Patents

Procédé de planification pour dispositifs ido ambiants

Info

Publication number
WO2025196127A1
WO2025196127A1 PCT/EP2025/057506 EP2025057506W WO2025196127A1 WO 2025196127 A1 WO2025196127 A1 WO 2025196127A1 EP 2025057506 W EP2025057506 W EP 2025057506W WO 2025196127 A1 WO2025196127 A1 WO 2025196127A1
Authority
WO
WIPO (PCT)
Prior art keywords
random
wireless communication
communication system
access
instructions
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/EP2025/057506
Other languages
English (en)
Inventor
Andreas Andrae
Rikin SHAH
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.)
Aumovio Germany GmbH
Original Assignee
Continental Automotive Technologies GmbH
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 Continental Automotive Technologies GmbH filed Critical Continental Automotive Technologies GmbH
Publication of WO2025196127A1 publication Critical patent/WO2025196127A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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

Definitions

  • the present application relates to wireless communications and relates more specifically to methods and devices for enhancing the usage of random-access uplink radio resources by wireless devices, for example, wireless devices harvesting ambient energy.
  • the internet of things (IoT) allows various devices to connect to the internet to send data, receive instructions, or both. Tens of billions of IoT devices are already deployed and the global number of IoT devices is expected to increase rapidly. Thus, massive connectivity is needed. However, powering these billions of IoT devices is a critical challenge, and deploying power cables or regularly replacing/recharging batteries is not a viable solution.
  • 3GPP Three Generation Partnership Project
  • NB-IoT narrow-band-IoT
  • LTE-MTC long-term evolution-machine-type communications
  • 3GPP is currently defining Ambient-IoT (A-IoT) technologies (see e.g., the technical report TR 38.848 V18.0.0) aiming at enabling ultra-low power consumption IoT devices, which could be either batteryless devices with no energy storage capability (performing backscattering transmission) or devices with energy storage that do not need to be replaced or recharged manually (performing wire-free energy harvesting (EH) from one or more energy sources).
  • A-IoT Ambient-IoT
  • A-IoT technologies (see e.g., the technical report TR 38.848 V18.0.0) aiming at enabling ultra-low power consumption IoT devices, which could be either batteryless devices with no energy storage capability (performing backscattering transmission) or 202401873 - 2 - devices with energy storage that do not need to be replaced or recharged manually (performing wire-free energy harvesting (EH) from one or more energy sources).
  • ultra-low power consumption devices or “A-IoT” devices, we mean devices having a peak power consumption lower than 1 mW, or even lower than 100 ⁇ W or lower than 10 ⁇ W.
  • Ambient-IoT currently aims at enabling A-IoT devices having the following characteristics: nsumption lower than 1 mW, or even lower than 100 ⁇ W or lower than 10 ⁇ W.
  • Ambient-IoT currently aims at enabling A-IoT devices having the following characteristics: around 1 ⁇ W peak power consumption with energy storage, with neither downlink (DL) nor uplink (UL) amplification in the device (the device’s UL transmission is backscattered on a carrier wave provided externally), below a few hundred ⁇ W peak power consumption with energy storage, with DL and/or UL amplification in the device (the device’s UL transmission may be generated internally by the device or be backscattered on a carrier wave provided externally)In some cases, such A-IoT devices may only initiate an uplink transmission when triggered so by the radio access network, RAN.
  • random-access uplink resources i.e., uplink resources which are shared by a plurality of wireless devices, on which each of these wireless devices can decide on its own when to transmit uplink data, which uplink data may therefore collide with uplink data from other wireless devices with which these uplink resources are shared.
  • Such random-access uplink resources on which uplink data from different wireless devices can collide are also referred to as contention-based uplink resources.
  • contention-based uplink resources include random-access channel, RACH, uplink resources.
  • the radio access network might need to trigger retransmissions by the colliding A-IoT devices, which would increase the signaling overhead for the RAN.
  • Summary 202401873 - 3 - The present application aims at improving the situation. In particular, the present application aims at addressing at least some of the limitations of the prior art discussed above. In particular, the present application aims at proposing a solution for reducing the risk of collisions between uplink data from wireless devices, such as A-IoT devices, willing to access uplink resources such as random-access uplink resources.
  • a user equipment selects the random- access preamble configuration for performing an uplink transmission based on a mapping between UE types and data volumes to be transmitted.
  • This enables the RAN to determine UE type and/or priority and allocate and/or schedule radio resources for subsequent uplink data transmission, and to reduce or cancel collisions.
  • the mapping between UE types and data volumes to be transmitted is specified and pre-configured, both sides, RAN and UE, are aware of this mapping, which reduces signaling overhead.
  • US 2019059113 A1 discloses to prioritized random access procedures in wireless systems.
  • An exemplary method generally includes receiving, from a user equipment, a random access request including information identifying a type of a random access event being invoked, identifying one or more parameters associated with a backoff interval to be observed at the user equipment based, at least in part, on a priority associated with the type of the random access event, and transmitting, to the user equipment, a random access response including the identified one or more parameters.
  • US 2019098540 A1 discloses a method for a terminal adjusting a random access backoff parameter in a wireless communication system, and a device supporting same.
  • the method may comprise the steps of: receiving priority information; initiating a random access procedure while executing a handover; receiving, from a base station, a random access response including a backoff indicator; and on the basis of the priority information, adjusting a random access backoff parameter indicated by the backoff indicator.
  • the method includes: a terminal device determines a backoff time of a random access event according to a priority of the random access event, where the random access event with the First priority corresponds to a first backoff time range, a random access event with a second priority corresponds to a second backoff time range, the first priority is higher than the second priority, and the first backoff time range and the second backoff time range do not overlap; and after the backoff time, the terminal device re-initiates the random access procedure.
  • US 2018317264 A1 discloses a communication method and system for converging a fifth generation (5G) communication system for supporting higher data rates beyond a fourth generation (4G) system with a technology for internet of things (IoT).
  • 5G fifth generation
  • 4G fourth generation
  • IoT internet of things
  • the communication method and system may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services.
  • intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services.
  • a method of a terminal for performing a random access procedure is provided.
  • the method includes transmitting a random access preamble associated with a random access procedure to a base station, receiving a random access response including information on a backoff parameter value from the base station, identifying a scaling factor for backoff based on a priority of the random access procedure or an event which triggers the random access procedure, determining a random backoff time based on the scaling factor and the backoff parameter value, and transmitting a subsequent random access preamble after the random backoff time to the base station.
  • 3GPP studies a new 3GPP IoT technology, suitable for deployment in a 3GPP system, which relies on ultra-low complexity devices with ultra-low power consumption for the very-low end IoT applications.
  • TR 38.848 The definitions provided in TR 38.848 are taken into consideration for this application.
  • the deployment scenarios with the following characteristics, referenced to the tables in Clause 4.2.2 of 3GPP TR 38.848 are: ⁇ Deployment scenario 1 with Topology 1 Base station and coexistence characteristics: Micro-cell ⁇ Deployment scenario 2 with Topology 2 and UE as intermediate node, under network control, base station and coexistence characteristics: Macro-cell, the location of intermediate node is indoor.
  • the Spectrum and Traffic Types are at first FR1 licensed spectrum in FDD. Spectrum deployment in-band to NR, in guard-band to LTE/NR, in standalone band(s) and the traffic types DO-DTT, DT, with focus on rUC1 (indoor inventory) and rUC4 (indoor command).
  • RACH procedure in NR is defined in TS38.300 (18.0.02024-01-12) Chapter 5.3.4 Random access and discloses. Random access preamble sequences, of four different lengths are supported.
  • Sequence length 839 is applied with subcarrier spacings of 1.25 and 5 kHz, sequence length 139 is applied with subcarrier spacings of 15, 30, 60, 120, 480, and 960 kHz, sequence length of 571 is applied with subcarrier spacings of 30, 120, and 480 kHz, and sequence length 1151 is applied with subcarrier spacings of 15 and 120 kHz. Sequence length 839 supports unrestricted sets and restricted sets of Type A and Type B, while sequence lengths 139, 571, and 1151 support unrestricted sets only. Sequence length 839 is only used for operation with licensed channel access while sequence length 139 can be used for operation with either licensed or shared spectrum channel access.
  • sequence lengths of 571 and 1151 can be used only for operation with shared spectrum channel access.
  • sequence lengths of 571 can be used for operation with either licensed or shared spectrum channel access only with subcarrier spacings of 120 kHz and 480 kHz and sequence lengths of 1151 can be used for operation with either licensed or shared spectrum channel access only with subcarrier spacings of 120 kHz.
  • 202401873 - 6 - Multiple PRACH preamble formats are defined with one or more PRACH OFDM symbols, and different CP and guard time. The PRACH preamble configuration to use is provided to the UE in the system information.
  • the UE calculates the PRACH transmit power for the retransmission of the preamble based on the most recent estimate pathloss and power ramping counter.
  • the system information provides information for the UE to determine the association between the SSB and the RACH resources.
  • the RSRP threshold for SSB selection for RACH resource association is configurable by network. Furthermore, random access sequence generation is specified in TS38.211 (v18.1.0 2023-12) Sec.6.3.3.1.
  • the following key parameters provided via SIB are: ⁇ PRACH Preamble Format ⁇ Time Resources ⁇ Frequency Resources Further parameters for determining the root sequences and their cyclic shifts in the PRACH Preamble sequence set are: ⁇ index to logical root sequence table, ⁇ Cyclic Shift(Ncs), ⁇ Set Type (unrestricted, restricted set A or restricted set B).
  • preambles defined in each time-frequency PRACH occasion, enumerated in increasing order of first increasing cyclic shift of a logical root sequence, and then in increasing order of the logical root sequence index, starting with the index obtained from the higher-layer parameter prach-RootSequenceIndex or rootSequenceIndex-BFR or by msgA-PRACH-RootSequenceIndex if configured and a type-2 random-access procedure is initiated as described in clause 8.1 of [5, TS 38.213]. Additional preamble sequences, in case 64 preambles cannot be generated from a single root Zadoff-Chu sequence, are obtained from the root sequences with the consecutive logical indexes until all the 64 sequences are found.
  • the logical root sequence order is cyclic; the logical index 0 is consecutive to L_"RA" -2.
  • the sequence number u is obtained from the logical root sequence index according to Tables 6.3.3.1-3 to 6.3.3.1-4B.
  • the problem solved by this application is how to efficiently use RACH resources and reduce random-access collisions for ambient IoT devices. Further, no additional signaling from the UE to RAN is needed for scheduling radio resources for UL data transmissions.
  • the selected RA preamble configurations can be mapped to UE types and data volumes to be transmitted. 202401873 - 8 - This problem is solved by the features of the independent claims and preferred embodiments are described in the dependent claims.
  • the present application relates to wireless communications and relates more specifically to methods and devices for enhancing the usage of random-access uplink radio resources by wireless devices, for example, wireless devices harvesting ambient energy.
  • the method being implemented by a user equipment, UE, of the wireless communication system, wherein the UE comprises a communication unit (XX) configured to exchange data with a radio access network, RAN, of the wireless communication system, wherein the method comprises: having a mapping between UE types, data volumes to be transmitted, and random-access preamble configurations, selecting based on UE types and data volumes to be transmitted a corresponding random-access preamble configuration, using the selected random- access preamble configuration for performing an uplink transmission.
  • the method is characterized by, that for ambient IoT UE the selection of random access preambles is pre-configured and based on a specified mapping.
  • the method is characterized by, that in response to receiving a random-access preamble a network node allocates and/or schedules radio resources for uplink data transmission. In some embodiments of the method according to the first aspect, the method is characterized by, that in response to receiving a random-access preamble a network node determines UE type and/or priority and allocates and/or schedules uplink data transmission. In some embodiments of the method according to the first aspect, the method is characterized by, that A IoT UE is pre-configured as type 1 and the data volume to be transmitted is within range [V10...V11[, the UE will apply preamble configuration #1.
  • the method is characterized by, that if UE is pre-configured as type 2 and the data volume to be transmitted is within range [V21...V22[, the UE will apply preamble configuration #N1+2.
  • the present application relates to an apparatus for random access for ambient IoT user equipment within a wireless communication system the apparatus comprising a wireless transceiver, a processor coupled with a memory in which computer program instructions are stored, said instructions being configured to execute the steps according to all embodiments of the first aspect.
  • the present application relates to a scheduling method for ambient IoT gNB within a wireless communication system, characterized by, that the gNB checks, if the RA preamble received, in case of reception of the RA preamble the gNB assigns radio resources for UL transmissions according to preamble ID and if RA preamble isn ⁇ t received the A-gNB stays in the loop and checks if RA preamble is received.
  • the present application relates to an apparatus for Random access for gNB within a wireless communication system the apparatus comprising a wireless transceiver, a processor coupled with a memory in which computer program instructions are stored, said instructions being configured to implement steps of the claim 6.
  • the present application relates to an ambient IoT User equipment comprising an apparatus according to one embodiment related to the second aspect of this application.
  • the present application relates to a gNB comprising an apparatus to one embodiment related to the fourth aspect of this application.
  • the present application relates to a wireless communication system comprising Wireless communication system for adjustment signaling using representative model by configuring a set of representative models, 202401873 - 10 - wherein the wireless communication systems comprises at least a user equipment according to the fifth aspect, at least a gNB according to the sixth aspect, whereby the user Equipment comprises a processor coupled with a memory in which computer program instructions are stored, said instructions being configured to carry out the steps of the first aspect, and a gNB comprises a processor coupled with a memory in which computer program instructions are stored, said instructions being configured to carry out the steps of the third aspect
  • the present application relates to a computer program product comprising instructions which, when executed by at least one processor, configure said at least one processor to carry out a method according to the first aspect said at least one processor to carry out a method for exchanging data according to any one of the embodiments of the present application .
  • the computer program product can use any programming language, and can be in the form of source code, object code, or in any intermediate form between source code and object code, such as in a partially compiled form, or in any other desirable form.
  • the present application relates to a computer-readable storage medium comprising instructions which, when executed by at least one processor, configure said at least one processor to carry out a method according to any one of the embodiments of the present application.
  • a preferred embodiment of the method for exchanging data in a wireless communication system ich characterized by, that the method being implemented by a user equipment, UE, of the wireless communication system, wherein the UE comprises a communication unit configured to exchange data with a radio access network, RAN, of the wireless communication system, wherein the method comprises: having a mapping between UE types, data volumes to be transmitted, and random- access preamble configurations, selecting based on UE types and data volumes to be transmitted a corresponding random-access preamble configuration, using the selected random-access preamble configuration for performing an uplink 202401873 - 11 - transmission.
  • Another preferred embodiment of the before mentioned method is characterized by that wherein a mapping between UE types, data volumes to be transmitted, and preamble configurations that is used for selecting of random access preamble configurations is pre-configured and/or based on a specified mapping.
  • Another preferred embodiment of the before mentioned method is characterized by, that wherein in response to receiving a random-access preamble a network node allocates and/or schedules radio resources for uplink data transmission.
  • Another preferred embodiment of the before mentioned method is characterized by, that wherein in response to receiving a random-access preamble a network node determines UE type and/or priority and allocates and/or schedules uplink data transmission.
  • the uplink preamble transmission triggering signal is a paging message and/or a wake-up signal that transitions the plurality of UEs from a sleep mode to an active mode.
  • the uplink preamble transmission triggering signal is a paging message and/or a wake-up signal that transitions the plurality of UEs from a sleep mode to an active mode.
  • each of the plurality of UEs comprises an energy harvesting unit (XX) configured to convert ambient energy into electrical energy that is stored in an energy storage unit (XX) of the UE.
  • XX energy harvesting unit
  • Another preferred embodiment is an apparatus for Random access for user equipment within a wireless communication system the apparatus comprising a wireless transceiver, a processor coupled with a memory in which computer program instructions are stored, said instructions being configured to carry out a method (XX) according to any one of the preceding claims 1, 2, 5, 6.
  • Another preferred embodiment is an apparatus for Random access for BS within a wireless communication system the apparatus comprising a wireless transceiver, a 202401873 - 12 - processor coupled with a memory in which computer program instructions are stored, said instructions being configured to carry out a method according to claims 2, 3, 4.
  • Another preferred embodiment is an ambient IoT User Equipment comprising an apparatus according to claim 7.
  • Another preferred embodiment is Base station (BS)S and/or wireless reader device comprising an apparatus according to claim 8.
  • Another preferred embodiment is a wireless communication system for adjustment signaling using representative model by configuring a set of representative models, wherein the wireless communication systems comprises at least a user equipment according to claim 9, at least a gNB according to claim 10, whereby the user Equipment comprises a processor coupled with a memory in which computer program instructions are stored, said instructions being configured to implement steps of the claims 1, 2, 5, 6 and a BS comprises a processor coupled with a memory in which computer program instructions are stored, said instructions being configured to implement steps of the claim 2, 3, 4.
  • Figure 1 is the tableau showing the configuration if UE is pre-configured as type 1 or 2
  • Figure 2 is the flowchart for the A-IoT UE
  • Figure 3 is the flowchart for the the BS, e.g., gNB DETAILED DESCRIPTION
  • the detailed description set forth below, with reference to annexed drawings, is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of the various concepts. However, it will be apparent to those skilled in 202401873 - 13 - the art that these concepts may be practiced without these specific details.
  • a more general term “network node” may be used and may correspond to any type of radio network node or any network node, which communicates with a UE (directly or via another node) and/or with another network node.
  • network nodes are NodeB, MeNB, ENB, a network node belonging to MCG or SCG, base station (BS), multi-standard radio (MSR) radio node such as MSR BS, eNodeB, gNodeB, network controller, radio network controller (RNC), base station controller (BSC), relay, donor node controlling relay, base 202401873 - 14 - transceiver station (BTS), access point (AP), transmission points, transmission nodes, RRU, RRH, nodes in distributed antenna system (DAS), core network node (e.g.
  • the non-limiting term user equipment (UE) or wireless device may be used and may refer to any type of wireless device communicating with a network node and/or with another UE in a cellular or mobile communication system.
  • each block of the schematic flowchart diagrams and/or schematic block diagrams, and combinations of blocks in the schematic flowchart diagrams and/or schematic block diagrams can be implemented by code.
  • This code may be provided to a processor of a general-purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the fimctions/acts specified in the flowchart diagrams and/or block diagrams.
  • the code may also be stored in a storage device that can direct a computer, other programmable data processing apparatus, or other devices to function in a particular manner, such that the instructions stored in the storage device produce an article of manufacture including instructions which implement the function/act specified in the flowchart diagrams and/or block diagrams.
  • the code may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus, or other devices to produce a computer implemented process such that the code which execute on the computer or other programmable apparatus provide processes for implementing the functions/acts specified in the flowchart diagrams and/or block diagrams.
  • each block in the flowchart diagrams and/or block diagrams may represent a module, segment, or portion of code, which includes one or more executable instructions of the code for implementing the specified logical function(s). 202401873 - 18 - It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the Figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.
  • each block of the block diagrams and/or flowchart diagrams, and combinations of blocks in the block diagrams and/or flowchart diagrams can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and code.
  • the description of elements in each figure may refer to elements of proceeding figures. Like numbers refer to like elements in all figures, including alternate embodiments of like elements.
  • the detailed description set forth below, with reference to the figures, is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details.
  • the application is related to wireless communication system, which may be for example a 5G NR wireless communication system. More specifically, it represents a RAN of the wireless communication system, which is used exchange data with UEs via radio signals. For example, the RAN may send data to the UEs (downlink, DL), for instance data received from a core network (CN). The RAN may also receive data from the UEs (uplink, UL), which data may be forwarded to the CN.
  • DL downlink
  • CN core network
  • uplink, UL uplink
  • the RAN comprises one base station, BS.
  • the RAN may comprise more than one BS to increase the coverage of the wireless communication system.
  • Each of these BSs may be referred to as NB, eNodeB (or eNB), gNodeB (or gNB, in the case of a 5G NR wireless communication system), an access point or the like, depending on the wireless communication standard(s) implemented.
  • the UEs are located in a coverage of the BS.
  • the coverage of the BS corresponds for example to the area in which UEs can decode a PDCCH transmitted by the BS.
  • An example of a wireless device suitable for implementing any method, discussed in the present application, performed at a UE corresponds to an apparatus that provides wireless connectivity with the RAN of the wireless communication system, and that can be used to exchange data with said RAN.
  • a wireless device may be included in a UE.
  • the UE may for instance be a cellular phone, a wireless modem, a wireless communication device, a handheld device, a laptop computer, or the like.
  • the UE may also be an Internet of Things (IoT) equipment, like a wireless camera, a smart sensor, a smart meter, smart glasses, a vehicle (manned or unmanned), a global positioning system device, etc., or any other equipment that may run applications that need to exchange data with remote recipients, via the wireless device.
  • IoT Internet of Things
  • the wireless device comprises one or more processors and one or more memories.
  • the one or more processors may include for instance a central processing unit (CPU), a digital signal processor (DSP), a field-programmable gate array (FPGA), an 202401873 - 20 - application specific integrated circuit (ASIC), etc.
  • the one or more memories may include any type of computer readable volatile and non-volatile memories (magnetic hard disk, solid-state disk, optical disk, electronic memory, etc.).
  • the one or more memories may store a computer program product, in the form of a set of program- code instructions to be executed by the one or more processors to implement all or part of the steps of a method for exchanging data, performed at a UE’s side, according to any one of the embodiments disclosed herein.
  • the wireless device can comprise also a main radio, MR, unit.
  • the MR unit corresponds to a main wireless communication unit of the wireless device, used for exchanging data with BSs of the RAN using radio signals.
  • the MR unit may implement one or more wireless communication protocols, and may for instance be a 3G, 4G, 5G, NR, WiFi, WiMax, etc. transceiver or the like.
  • the MR unit corresponds to a 5G NR wireless communication unit.
  • gNB schedules radio resources for UL data transmission based on received random access preamble.
  • UE selects the random access preamble based on UE type and/or data volume, where the mapping between UE type, data volume, and preamble are specified in the specification.
  • a UE When a UE triggers the random access procedure, it selects the random access preamble configuration according to the specified mapping. Beneficially, no additional signaling from the UE to gNB is needed for scheduling radio resources for UL data transmissions. RA congestion among UEs is reduced, as UEs apply specified mapping for the selection of dedicated random access preambles.
  • Figure 1 is the tableau showing the configuration if UE is pre-configured as type 1 and the data volume to be transmitted is within range [V10...V11[, the UE will apply preamble configuration #1. If UE is pre-configured as type 2 and the data volume to be transmitted is within range [V21...V22[, the UE will apply preamble configuration #N1+2.
  • FIG 2 is the flowchart for the A-IoT UE.
  • the A-IoT UE starts and pre-configuration of mapping is performed.
  • the A-IoT UE selects RA 202401873 - 21 - preamble according to pre-configured mapping and then flow stops.
  • RA isn ⁇ t triggered the A-IoT UE stay in the loop checks if RA triggered.
  • RA congestion among UEs is reduced, as UEs apply specified mapping for the selection of dedicated random access preambles.
  • Figure 3 is the flowchart for the gnB.
  • the gNB checks, if the RA preamble received, in case of reception of the RA preamble the gNB assigns radio resources for UL transmissions according to preamble ID and if RA preamble isn ⁇ t received the gNB stays in the loop and checks if RA preamble is received.

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

Abstract

L'invention concerne des procédés et des dispositifs pour améliorer l'utilisation de ressources radio de liaison montante à accès aléatoire par des dispositifs sans fil, par exemple, des dispositifs sans fil collectant l'énergie ambiante. Le procédé est mis en œuvre par un équipement utilisateur (UE) du système de communication sans fil, l'UE comprenant une unité de communication (XX) configurée pour échanger des données avec un réseau d'accès radio (RAN) du système de communication sans fil, le procédé consistant à : avoir un mappage entre des types d'UE, des volumes de données à transmettre et des configurations de préambule d'accès aléatoire ; sélectionner, sur la base des types d'UE et des volumes de données à transmettre, une configuration de préambule d'accès aléatoire correspondante ; utiliser la configuration de préambule d'accès aléatoire sélectionnée pour effectuer une transmission de liaison montante.
PCT/EP2025/057506 2024-03-22 2025-03-19 Procédé de planification pour dispositifs ido ambiants Pending WO2025196127A1 (fr)

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