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WO2025171508A1 - Mise en correspondance d'occasions d'accès aléatoire et de blocs de signal de synchronisation - Google Patents

Mise en correspondance d'occasions d'accès aléatoire et de blocs de signal de synchronisation

Info

Publication number
WO2025171508A1
WO2025171508A1 PCT/CN2024/077180 CN2024077180W WO2025171508A1 WO 2025171508 A1 WO2025171508 A1 WO 2025171508A1 CN 2024077180 W CN2024077180 W CN 2024077180W WO 2025171508 A1 WO2025171508 A1 WO 2025171508A1
Authority
WO
WIPO (PCT)
Prior art keywords
ssb
ros
cell
ssbs
user equipment
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/CN2024/077180
Other languages
English (en)
Inventor
Tao Tao
Sami-Jukka Hakola
Naizheng ZHENG
Daniela Laselva
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 Shanghai Bell Co Ltd
Nokia Solutions and Networks Oy
Nokia Technologies Oy
Original Assignee
Nokia Shanghai Bell Co Ltd
Nokia Solutions and Networks Oy
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 Shanghai Bell Co Ltd, Nokia Solutions and Networks Oy, Nokia Technologies Oy filed Critical Nokia Shanghai Bell Co Ltd
Priority to PCT/CN2024/077180 priority Critical patent/WO2025171508A1/fr
Publication of WO2025171508A1 publication Critical patent/WO2025171508A1/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
    • 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

  • Various example embodiments relate generally to allocation of random access occasions and to mapping of the occasions to SSBs.
  • Energy saving is an important topic wireless communication.
  • One pos-sibility for energy saving may be in allocation of random access occasions.
  • Figure 1 presents a network to which one or more embodiments are applicable
  • Figure 2 shows an example of distribution of terminal devices in a cell, according to an embodiment
  • FIGS 4 and 5 show methods, according to some embodiments
  • FIGS. 6A and 6B show further examples on how random access occa-sions (ROs) may be distributed among SSBs, according to some embodiments;
  • ROs random access occa-sions
  • Figure 7 shows a signaling flow diagram, according to an embodiment
  • Figure 8 illustrate an apparatus, according to some embodiments.
  • the phrases “at least one of A or B” , “at least one of A and B” , and “Aand/or B” means (A) , (B) , or (Aand B) .
  • the phrase “A, B, and/or C” means (A) , (B) , (C), (Aand B) , (Aand C) , (B and C) , or (A, B, and C) .
  • Embodiments described may be implemented in a communication net-work, such as any of the following radio access technologies (RATs) : Worldwide Interoperability for Micro-wave Access (WiMAX) , Global System for Mobile com-munications (GSM, 2G) , GSM EDGE radio access Network (GERAN) , General Packet Radio Service (GRPS) , Universal Mobile Telecommunication System (UMTS, 3G) based on basic wideband-code division multiple access (W-CDMA) , high-speed packet access (HSPA) , Long Term Evolution (LTE) , LTE-Advanced, and enhanced LTE (eLTE) , 5G (also called NR) , or any future RAT such as 6G.
  • RATs radio access technologies
  • WiMAX Worldwide Interoperability for Micro-wave Access
  • GSM Global System for Mobile com-munications
  • GERAN GSM EDGE radio access Network
  • GRPS General Packet Radio Service
  • UMTS Universal Mobile Telecommunication
  • commu-nication within the communication network may utilize any proper wireless com-munication technology, comprising but not limited to: Code Division Multiple Ac-cess (CDMA) , Frequency Division Multiple Access (FDMA) , Time Division Multiple Access (TDMA) , Frequency Division Duplex (FDD) , Time Division Duplex (TDD) , Multiple-Input Multiple-Output (MIMO) , Orthogonal Frequency Division Multiple (OFDM) , and/or Discrete Fourier Transform spread OFDM (DFT-s-OFDM) .
  • CDMA Code Division Multiple Ac-cess
  • FDMA Frequency Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • MIMO Multiple-Input Multiple-Output
  • OFDM Orthogonal Frequency Division Multiple
  • DFT-s-OFDM Discrete Fourier Transform spread OFDM
  • terminal device refers to any end device that may be capable of wireless communication.
  • a terminal device may be referred to as a communication device, user equipment (UE) , a Subscriber Station (SS) , or a Mobile Station (MS) .
  • UE user equipment
  • SS Subscriber Station
  • MS Mobile Station
  • the terminal device may include a mobile phone, a cellular phone, a smart phone, voice over IP (VoIP) phones, wireless local loop phones a tablet, a wearable terminal device, a personal digital assistant (PDA) , portable com-puters, desktop computer, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, vehicle-mounted wireless terminal devices, USB dongles, an Internet of Things (IoT) device, a watch or other wearable, a head-mounted display (HMD) , a vehicle, a drone, a medical device and applications (e.g., remote surgery) , an industrial device and applications (e.g., a robot and/or other wireless devices operating in an industrial and/or an automated processing chain contexts) , a consumer electronics device, a device op-erating on commercial and/or industrial wireless networks, and the like.
  • IoT Internet of Things
  • HMD head-mounted display
  • network device or “network node” refers to a node in a communication network via which user equipment may access the net-work and/or which is capable of controlling radio communication and managing radio resources within a cell.
  • the network node or network device may be referred to as a base station (BS) , an access point (AP) or an access node.
  • BS base station
  • AP access point
  • the network de-vice may be, depending on the applied technology, for example, a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , an NR NB (also referred to as a gNB) , a Remote Radio Unit (RRU) , a radio head (RH) , a remote radio head (RRH) , a relay, an Integrated Access and Backhaul (IAB) node, a low power node, a non-terrestrial network (NTN) or non-ground network device such as a satellite network device, a low earth orbit (LEO) satellite and a geosynchronous earth orbit (GEO) satellite, or an aircraft network device.
  • NodeB or NB node B
  • eNodeB or eNB evolved NodeB
  • NR NB also referred to as a gNB
  • RRU Remote Radio Unit
  • RH radio head
  • RRH remote radio head
  • IAB Integrated Access and Back
  • the net-work device may refer to a centralised unit (CU) of a base station and/or a distrib-uted unit (DU) of a base station.
  • An interface between CU and DU may be referred to as an F1 interface in NR.
  • node operations may be carried out, at least partly, in the central/centralized unit, CU, (e.g. server, host or node) operationally coupled to the DU, (e.g. a radio head/node) .
  • One CU may con-trol one or more DUs, acting at least as transmit/receive (Tx/Rx) nodes.
  • the DUs may comprise e.g. a radio link control (RLC) , medium access control (MAC) layer and a physical (PHY) layer
  • the CU may comprise the layers above RLC layer, such as a packet data convergence protocol (PDCP) layer, a radio resource control (RRC) and an internet protocol (IP) layers.
  • RLC radio link control
  • MAC medium access control
  • PHY physical
  • the CU may comprise the layers above RLC layer, such as a packet data convergence protocol (PDCP) layer, a radio resource control (RRC) and an internet protocol (IP) layers.
  • PDCP packet data convergence protocol
  • RRC radio resource control
  • IP internet protocol
  • a term “resource” may refer to radio resources in time domain, in frequency domain, in space domain, and/or in code domain. Some ex-amples of resources include e.g. a physical resource block (PRB) , a radio frame, a subframe, a time slot, a subband, a frequency region, a sub-carrier, a beam, etc.
  • PRB physical resource block
  • the term “transmission” and/or “reception” may refer to wirelessly transmitting and/or receiving via a wireless propagation channel on radio resources.
  • FIG. 1 illustrates an example of a communication network to which examples disclosed herein may be applied.
  • the communication network or a cellu-lar communication network may comprise a network node 110 providing one or more cells, such as cell 100, and a network node 112 providing one or more other cells, such as cell 102.
  • Each cell may be, e.g., a macro cell, a micro cell, femto, or a pico cell, for example.
  • the cell may define a coverage area or a service area of the corresponding access node.
  • the network node 110 may provide a user equipment (UE) 120 (one or more UEs) with wireless access to the communication network.
  • the wireless ac-cess may comprise downlink (DL) communication from the network node to the UE 120 and uplink (UL) communication from the UE 120 to the network node.
  • uplink channels comprise physical uplink control channel (PUCCH) for transmitting control information and physical uplink shared channel (PUSCH) for transmitting data towards the network.
  • Examples of downlink channels comprise physical downlink control channel (PDCCH) for transmitting control information and physical downlink shared channel (PDSCH) for transmitting data towards the user equipment.
  • PUCCH physical uplink control channel
  • PDSCH physical downlink shared channel
  • D2D device-to-device
  • SL sidelink
  • D2D communications may be referred to as machine-to-machine, peer-to-peer (P2P) communications, or vehicle-to-vehicle (V2V) , for example.
  • the network nodes may be connected to each other via an interface.
  • LTE specifica-tions call such an interface as X2 interface.
  • An interface between an LTE node and a 5G node, or between two 5G nodes may be called Xn interface.
  • the network nodes 110 and 112 may be further connected via another interface to a core network 116 of the communication network.
  • the LTE specifica-tions specify the core network as an evolved packet core (EPC)
  • the core net-work may comprise e.g. a mobility management entity (MME) and a gateway node.
  • the MME may handle mobility of terminal devices in a tracking area encompassing a plurality of cells and handle signalling connections between the terminal devices and the core network.
  • the gateway node may handle data routing in the core network and to/from the terminal devices.
  • the 5G specifications specify the core network as a 5G core (5GC) .
  • the 5G core may comprise e.g. an access and mobility management function (AMF) and a user plane function/gateway (UPF) and other functions.
  • AMF access and mobility management function
  • UPF user plane function/gateway
  • the AMF may handle termination of non-access stratum (NAS) signal-ling, NAS ciphering &integrity protection, registration management, connection management, mobility management, access authentication and authorization, se-curity context management.
  • NAS non-access stratum
  • the UPF node may support packet routing and for-warding, packet inspection and quality of service (QoS) handling, for example.
  • QoS quality of service
  • PRACH physical random access channel
  • SSB synchronization signal block
  • Initial Access means a sequence of process between a user equipment (UE ) and a network node (e.g. gNB) in order for UE to acquire uplink synchroniza-tion and obtain a specified identifier for the radio access communication.
  • a network node e.g. gNB
  • RA random access
  • ⁇ Msg1 (Preamble Transmission) : The UE selects a random access preamble from a set of predefined preambles. The UE also se-lects a random sequence number for the preamble. After choos-ing the preamble and sequence number, the UE transmits the preamble on the PRACH.
  • Msg2 Random Access Response: Upon receiving Msg1, the gNB sends a response called Msg2.
  • Msg2 consists of several pieces of information, such as the Time Advance (TA) command for timing adjustment, the RAPID (Random Access Preamble ID) matching the preamble sent by the UE, and an initial uplink grant for the UE.
  • TA Time Advance
  • RAPID Random Access Preamble ID
  • RA-RNTI Random Access Radio Network Temporary Identifier
  • Msg3 Using the initial uplink grant provided in Msg2, the UE transmits Msg3 on the PUSCH (Physical Uplink Shared Channel) .
  • Msg3 is a PUSCH which may carry a certain RRC message or just data.
  • Msg4 (Contention Resolution, ifneeded): After processing Msg3, the gNB sends Msg4 to the UE.
  • Msg4 is a MAC data which is for Contention Resolution.
  • the Contention Resolution message con-tains the UE′s identity, confirming that the gNB has correctly identified the UE, and contention has been resolved.
  • network provides UE with C-RNTI (Cell Radio Network Tempo-rary Identifier) .
  • RACH Occasion is an area specified in time and frequency domain that is available for the transmission and reception of RACH preamble.
  • RRC message e.g. SIB2
  • each synchronization signal block (SSB) is associated with a different beam and the UE selects a certain beam and sends the preamble corresponding to that beam.
  • SSB synchronization signal block
  • 3GPP has defined a specific mapping be-tween SSB and RO and preamble. By detecting in which RO and which preamble the UE sends PRACH to, the network can figure out which SSB Beam the UE had selected. This aids in allowing the network to respond to the UE accordingly.
  • the mapping between SSB and RACH Occasion (ROs) is defined by the following two RRC parameters: ‘msg1-FDM' and ‘ssb-perRACH-OccasionAndCB-PreamblesPerSSB'.
  • the parameter ‘msg-FDM' specifies how many RO (s) are allo-cated in frequency domain (at the same location in time domain) .
  • Parameter ‘ssb-perRACH-OccasionAndCB-PreamblesPerSSB' specifies how many SSB (s) can be mapped to one RO and how many preamble indexes can be mapped to a single SSB. These may be carried in a random access configuration -message, for example.
  • 3GPP defines the overall mapping logic between SSBs and RO as follows.
  • the gNB can only assign the same number of ROs and preambles to each SSB (e.g. one RO and set of preambles within the RO per SSB) , see Figure 3A. Under such configuration, there is higher access collision probability for the UEs in SSB beam #1 coverage. In addition, the assigned Ros in beams #2 and #4 are actually useless and consequently result in energy consumption waste for the NW due to unneces-sary receiving operations.
  • Non-uniform PRACH resource allocation across different SSBs may be beneficial for both the network and the UE.
  • a prediction on the UEs location is possible e.g. based on statistics about occurred RACHs associated to each SSB.
  • more ROs e.g. two ROs
  • the remining SSBs could share fewer ROs (e.g. a single RO) , see Figure 3B.
  • one RO can be saved compared to uniform allocation, which increases radio resource utilization and reduces NW power consumption.
  • non-uniform mapping may comprise e.g. a different number of ROs being mapped to at least some of the ROs, for example to a first SSB and to a second SSB.
  • This may be accomplished by introducing a set of multiplier factors associated to SSB beams (i.e. SSB indices) and to be applied on top of the existing SSB and RO mapping parameters in order to support non-uniform PRACH resource allocation per SSB.
  • each trans-mitted SSB beam is associated with a new multiplier factor, based on which UE and gNB determine the SSB per RO mapping.
  • Figure 4 depicts an example method.
  • the method may be computer-im-plemented.
  • the method may be performed by a user equipment, such as the UE 120.
  • the UE in step 400 receives, from a network node of a cell (such as from the gNB 110 providing cell 100) , a random access (RA) configu-ration.
  • the RA configuration may be received in system information.
  • SIB1 system information block 1
  • the UE may receive the RA configuration while in a RRC idle state (or in a RRC inactive state) , before trying to establish connection to the cell with a RA procedure.
  • the RA configuration can be received in RRC signaling from the gNB.
  • the RA configuration may comprise different information elements (IEs) .
  • the RA configuration comprises a common number of ROs mapped to each SSB of the cell.
  • the parameter (IE) indicating the common number is ssb-perRACH-OccasionAndCB-PreamblesPerSSB, which is ex-plained above. Although this parameter indicates the number of SSBs per RO, it in-versely or at least implicitly provides the number of ROs per SSB.
  • the RA configuration may also comprise a frequency domain related parameter specifying how many ROs are allocated in a frequency domain at a same time domain resource. This may be ‘msg1-FDM' which is explained above.
  • the RA configuration also comprises a plurality of adjustment factors (also called e.g. multiplier factors) , wherein each of the adjustment factors indi-cates an SSB-specific adjustment for the mapping between the ROs and the SSBs, e.g. for adjusting the number of ROs as given by the common number.
  • the adjust-ment factors IE may be seen as a vector of values enabling non-uniform distribu-tion/allocation of ROs in different SSBs of the cell. That is, all values in the vector are not the same, leading to the non-uniform mapping.
  • Each adjustment factor could be an integer or a fraction. For example, there may be eight SSBs in the cell, and eight multiplier factors may be provided in the RA configuration, each associ-ated with one of the SSBs.
  • a uniform distribution could comprise e.g. one RO in each SSB or four ROs in each SSB.
  • the non-uniform mapping may be e.g. one RO in SSBs #1-#2, four ROs in SSB #3, two ROs in SSBs #4 to #6, and SSBs #7 and #8 may share one RO (i.e. a half RO for each of SSBs #t and #8) .
  • the UE determines the mapping between the ROs and the SSBs at least partially based on the common number and the adjustment fac-tors. That is, a uniform mapping may originally be given e.g. by ‘ssb-perRACH-Oc-casionAndCB-PreamblesPerSSB' (and ‘msg1-FDM') parameters and the adjust-ment factors are used to adjust the original uniform mapping into non-uniform mapping, as will be explained in more details later.
  • a uniform mapping may originally be given e.g. by ‘ssb-perRACH-Oc-casionAndCB-PreamblesPerSSB' (and ‘msg1-FDM') parameters and the adjust-ment factors are used to adjust the original uniform mapping into non-uniform mapping, as will be explained in more details later.
  • Figure 5 depicts an example method.
  • the method may be computer-im-plemented.
  • the method may be performed by a network node of a cell, such as the gNB 110 controlling or providing cell 100.
  • the gNB determin-ing, for each SSB, a number of ROs. This may result in the desired non-uniform map-ping of the ROs among the SSBs.
  • this determination is based on statistical or expected number of UEs present in the given SSB.
  • This determination need not be fixed in time domain. At different times of a day, for example, there may be different num-ber of UEs expected to be present in certain beam direction of the cell. For example, at office hours an enterprise located in the direction of a beam of a certain SSB (which are sent beam-wise in spatial domain) may be expected to host several UEs, while in the evening the number of UEs in that beam direction may be expected to be less.
  • the gNB transmits to user equipments (e.g. broadcasts) in the cell, the RA configuration comprising the common number of ROs mapped to each SSB of the cell and the plurality of adjustment factors.
  • the UEs camping in the cell may receive knowledge of the relevant parameters required to determine the non-uniform mapping.
  • the SSB specific adjustment factor indicates an adjustment of the number of ROs as given by the common number.
  • the gNB may e.g. determine the adjustment factors in step 500 to be such that non-uniform map-ping between ROs and SSBs is reached.
  • each SSB of the cell need not be provided with an associated adjustment factor. How-ever, if there is an adjustment factor provided for a given SSB of the cell, then de-termining the mapping for that SSB is at least partly based on the corresponding adjustment factor.
  • the parameter ‘ssb-perRACH-OccasionAndCB-PreamblesPerSSB' indicates that each SSB of the cell (including the given SSB of this example) is associated with four ROs, and the gNB determines in step 500 that only two ROs are needed for this SSB, then the adjustment factor may be such that use of it halves the number of ROs.
  • the number of SSBs of the cell corresponds to actually transmitted SSBs (e.g. based on ssb-PositionsInBurst) in the cell or corresponds to a configured num-ber of SSBs in the cell.
  • the number of SSBs may vary from cell to cell and/or may vary in time within the cell (e.g. more SSBs are transmitted during day than during night) .
  • the number of adjustment factors equals to the num-ber of SSBs of the cell such that each of the adjustment factors is associated with one SSB.
  • each adjustment factor is associated with one SSB beam (e.g. adjustment factor i in the set of adjustment factors is associated with a trans-mitted SSB of the cell having index i) .
  • some adjust-ment factors may take a value ‘1' meaning that the number (or mapping) of ROs per SSB, as given by the common number, is unchanged.
  • one adjustment factor is to be applied to more than one SSB beam. That is, at least one of the adjustment factors is associated with a plurality of SSBs.
  • an adjustment factor i in the set is associated with SSBs having indexes i and i+1
  • an adjustment factor i+1 in the set is associated with SSBs having indexes i+2 and i+3, etc.
  • Such mapping between the adjustment factors and SSBs may be based on configuration information received from the cell in system information, or may be predefined by standard specifications, for exam-ple.
  • Figures 6A and 6B shows couple examples of how the set of adjustment factors may alter the otherwise uniform mapping between ROs and SSBs.
  • the uniform map-ping of ROs per SSB in this example, as given by ‘ssb-perRACH-OccasionAndCB- PreamblesPerSSB' is 1 RO per SSB, leading to 8 ROs in total. It is further assumed that the number of transmitted SSBs in the cell is 8.
  • the UE receiving the RA configuration in system information may determine the map-ping to be as shown in Figure 6A, where SSBs #1 and #2 each have two ROs, SSBs #3 and #4 share one RO, SSBs #5 and #6 share another RO, and SSBs #7 and #8 also share one RO.
  • This may be obtained by the UE multiplying the common num-ber (‘1') with the adjustment factors.
  • SSBs #3-#8 corresponds to beams with less UE density.
  • the number of ROs is decreased (from 8 to 7) but these are distributed in the cell in better propor-tion with the expected density of UEs, leading to enhanced communication effi-ciency.
  • the UE receiving the RA configuration in system information may determine the mapping to be as shown in Figure 6A, where SSBs #1 and #2 each have one RO, SSBs #3 -#6 share one RO, and SSBs #7 and #8 share another RO. This may be obtained by the UE multiplying the common number (‘1/2') with the adjustment factors. In this example it may be assumed that SSBs #3 -#6 corre-spond to beams with smallest amount of UEs, SSBs #7 and #8 correspond to beams with more UEs, and SSBs #1 and #2 correspond to beams with largest amount of UEs. As can be seen, the number of ROs are distributed in the cell in better propor-tion with the expected density of UEs, leading to enhanced communication effi-ciency.
  • mapping principles when the non-uniform RO to SSB mapping is utilized.
  • a repetitive mapping principle can be ap-plied.
  • the frequency of RO occurrence per SSB is determined by the adjustment factor, as illustrated above e.g. with reference to figures 5A and 6B.
  • one aim is that within a certain full time period (during which each SSB has at least once the corresponding RO (s) ) , frequency of occurrence of certain RO would be proportional to the corresponding multiplier factor.
  • the non-uniform mapping per repetitive pat-tern may be as follows, where the top row gives logical RO index and the second row shows to which SSB the RO is mapped to:
  • the gNB may allocate, for each SSB starting from a SSB with a predetermined index (e.g. the lowest SSB index) , a contiguous group of at least one RO until the number of ROs as determined for that that SSB is reached, wherein the contiguous group is defined in terms of RO indexes starting from a RO with a predetermined index (e.g. the lowest RO index) .
  • a predetermined index e.g. the lowest SSB index
  • the gNB first allocates ROs #0 and #1 to SSB#0, because SSB #0 is determined to have two ROs. Then the gNB allocates ROs #2 and #3 to SSB#1, because SSB #1 is deter-mined to have two ROs. The allocation continues in this way for each SSB until all SSBs have been allocated with correct number of ROs. Contiguous group of ROs may provide an advantage of efficient allocation.
  • the gNB may allocate, for each SSB starting from a SSB with a predetermined index (e.g. the lowest index) , a random group of at least one RO until the number of ROs as determined for that that SSB is reached.
  • a predetermined index e.g. the lowest index
  • the frequency of occurrence of RO is proportional to the SSB specific adjustment factor.
  • the group of ROs allocated for a given SSB need not be contiguous in terms of RO indexes. For example, the gNB first allocates ROs #0 and #6 to SSB#0, because SSB #0 is determined to have two ROs. Then the gNB allo-cates ROs #1 and #8 to SSB#1, because SSB #1 is determined to have two ROs. The allocation continues in this way for each SSB until all SSBs have been allocated with correct number of ROs.
  • the UE in step 710 selects at least one of the SSBs, possibly the one with the strongest received signal power or otherwise best quality. In other words, the UE selects a beam corresponding to one of the SSBs for performing a random ac-cess.
  • the UE determines at least one RO in the selected SSB based on the mapping determined in step 706. The location of each RO may be indicated in the system information, so the UE would know the time/frequency domain loca-tion (s) of the RO (s) in the selected SSB. For example, first ROs are allocated onto RACH slots according to RACH configuration. ROs are allocated with a configura-tion period of e.g. 10, 20, 40, 80 or 160 ms.
  • One association period is a period where all SSBs are mapped to ROs at least once. There can be one or multiple association periods within e.g. 160 ms association pattern period.
  • Each SSB may in this embod-iment be associated with one adjustment factor, or one adjustment factor may be associated with a plurality of SSBs (as explained above) , or a lack of an associated adjustment factor may mean a predetermined number of ROs is/are present in the corresponding SSB.
  • the parameter “adjustment fac-tors” may be called merely e.g. a mapping parameter or ‘ssb-perRACH-Occasion' parameter, since it is not adjusting anything but directly giving the numbers of RO(s) per SSB (or SSB (s) per RO) .
  • This embodiment may reach the end result with less signaling. However, it may require more changes to standardization than the embodiment where legacy parameters are utilized as well.
  • the apparatus 10 may comprise the terminal device of a communication system, e.g. a user terminal (UT) , a computer (PC) , a laptop, a tabloid computer, a cellular phone, a mobile phone, a communicator, a smart phone, a palm computer, a mobile transportation apparatus (such as a car) , a household appliance, or any other communication apparatus, commonly called as UE in the description.
  • the apparatus is comprised in such a terminal device.
  • the apparatus may be or comprise a module (to be attached to the UE) providing connectivity, such as a plug-in unit, an “USB dongle” , or any other kind of unit.
  • the unit may be installed either inside the UE or attached to the UE with a connector or even wirelessly.
  • the apparatus 10 is or is comprised in the UE 120.
  • the apparatus may be caused to execute some of the functionalities of the above described processes, such as the steps of Figure 4.
  • the apparatus 10 may be or be comprised in a network node, such as in gNB/gNB-CU/gNB-DU of 5G.
  • the ap-paratus is or is comprised in the network node 110.
  • the apparatus may be caused to execute some of the functionalities of the above described processes, such as the steps of Figure 5.
  • the apparatus may further comprise a radio interface (TRX) 16 com-prising hardware and/or software for realizing communication connectivity ac-cording to one or more communication protocols.
  • TRX radio interface
  • the TRX may provide the appa-ratus with communication capabilities, for example.
  • the apparatus may also comprise a user interface 18 comprising, for example, at least one keypad, a microphone, a touch display, a display, a speaker, etc.
  • the user interface may be used to control the apparatus by the user.
  • the control circuitry 12 may comprise relevant circuitry/ies for per-forming the functions, according to any of the embodiments.
  • an apparatus carrying out at least some of the em-bodiments described comprises at least one processor and at least one memory including a computer program code, wherein the at least one memory and the com-puter program code are configured, with the at least one processor, to cause the apparatus to carry out the functionalities according to any one of the embodiments described.
  • the computer program code when the at least one processor executes the computer program code, the computer program code causes the apparatus to carry out the functionalities according to any one of the embodiments described.
  • circuitry refers to all of the follow-ing: (a) hardware-only circuit implementations, such as implementations in only analog and/or digital circuitry, and (b) combinations of circuits and soft-ware (and/or firmware) , such as (as applicable) : (i) a combination of processor (s) or (ii) portions of processor (s) /software including digital signal processor (s) , software, and memory (ies) that work together to cause an apparatus to perform various functions, and (c) circuits, such as a microprocessor (s) or a portion of a micropro-cessor (s) , that require software or firmware for operation, even if the software or firmware is not physically present.
  • circuitry' applies to all uses of this term in this application.
  • circuitry' would also cover an implementation of merely a processor (or mul-tiple processors) or a portion of a processor and its (or their) accompanying soft-ware and/or firmware.
  • circuitry' would also cover, for example and if applicable to the particular element, a baseband integrated circuit or applications processor integrated circuit for a mobile phone or a similar integrated circuit in a server, a cellular network device, or another network device.
  • At least some of the processes described may be car-ried out by an apparatus comprising corresponding means for carrying out at least some of the described processes.
  • Some example means for carrying out the pro-cesses may include at least one of the following: detector, processor (including dual-core and multiple-core processors) , digital signal processor, controller, re-ceiver, transmitter, encoder, decoder, memory, RAM, ROM, software, firmware, dis-play, user interface, display circuitry, user interface circuitry, user interface soft-ware, display software, circuit, antenna, antenna circuitry, and circuitry.
  • non-transitory is a limitation of the medium itself (i.e. tangible, not a signal) as opposed to a limitation on data storage persis-tency (e.g. RAM vs. ROM) .
  • the appa-ratus (es) of embodiments may be implemented within one or more application-specific integrated circuits (ASICs) , digital signal processors (DSPs) , digital signal processing devices (DSPDs) , programmable logic devices (PLDs) , field programma-ble gate arrays (FPGAs) , processors, controllers, micro-controllers, microproces-sors, other electronic units designed to perform the functions described herein, or a combination thereof.
  • ASICs application-specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programma-ble gate arrays
  • processors controllers, micro-controllers, microproces-sors, other electronic units designed to perform the functions described herein, or a combination thereof.
  • Embodiments as described may also be carried outin the form of a com-puter process defined by a computer program or portions thereof. Embodiments of the methods described may be carried out by executing at least one portion of a computer program comprising corresponding instructions.
  • the computer program may be in source code form, object code form, or in some intermediate form, and it may be stored in some sort of carrier, which may be any entity or device capable of carrying the program.
  • the computer program may be stored on a com-puter program distribution medium readable by a computer or a processor.
  • the computer program medium may be, for example but not limited to, a record me-dium, computer memory, read-only memory, electrical carrier signal, telecommu-nications signal, and software distribution package, for example.
  • the computer program medium may be a non-transitory medium. Coding of software for carrying out the embodiments as shown and described is well within the scope of a person of ordinary skill in the art.

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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 un procédé comprenant les étapes consistant à : recevoir d'un nœud de réseau d'une cellule une configuration d'accès aléatoire contenant un nombre commun d'occasions d'accès aléatoire (RO) mises en correspondance avec chaque bloc de signal de synchronisation (SSB) de la cellule et une pluralité de facteurs d'ajustement, chacun des facteurs d'ajustement indiquant un ajustement spécifique à un SSB permettant une mise en correspondance entre les RO et les SSB ; et, au moins en partie sur la base du nombre commun et des facteurs d'ajustement, déterminer la mise en correspondance entre les RO et les SSB.
PCT/CN2024/077180 2024-02-13 2024-02-13 Mise en correspondance d'occasions d'accès aléatoire et de blocs de signal de synchronisation Pending WO2025171508A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2024/077180 WO2025171508A1 (fr) 2024-02-13 2024-02-13 Mise en correspondance d'occasions d'accès aléatoire et de blocs de signal de synchronisation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2024/077180 WO2025171508A1 (fr) 2024-02-13 2024-02-13 Mise en correspondance d'occasions d'accès aléatoire et de blocs de signal de synchronisation

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109451867A (zh) * 2018-02-12 2019-03-08 北京小米移动软件有限公司 随机接入时机的配置方法及装置、随机接入方法及装置
EP3636035A1 (fr) * 2017-05-05 2020-04-15 Samsung Electronics Co., Ltd. Station de base, terminal, procédé de détection de préambule d'accès aléatoire et procédé de configuration de canal d'accès aléatoire
WO2022081341A1 (fr) * 2020-10-14 2022-04-21 Qualcomm Incorporated Surcharge spatiale de préambule à accès aléatoire
WO2023103873A1 (fr) * 2021-12-06 2023-06-15 华为技术有限公司 Procédé et appareil de détermination d'une occasion de canal d'accès aléatoire (ro)
CN116489800A (zh) * 2023-06-15 2023-07-25 北京智芯微电子科技有限公司 映射关系确定方法、装置及存储介质、基站

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3636035A1 (fr) * 2017-05-05 2020-04-15 Samsung Electronics Co., Ltd. Station de base, terminal, procédé de détection de préambule d'accès aléatoire et procédé de configuration de canal d'accès aléatoire
CN109451867A (zh) * 2018-02-12 2019-03-08 北京小米移动软件有限公司 随机接入时机的配置方法及装置、随机接入方法及装置
WO2022081341A1 (fr) * 2020-10-14 2022-04-21 Qualcomm Incorporated Surcharge spatiale de préambule à accès aléatoire
WO2023103873A1 (fr) * 2021-12-06 2023-06-15 华为技术有限公司 Procédé et appareil de détermination d'une occasion de canal d'accès aléatoire (ro)
CN116489800A (zh) * 2023-06-15 2023-07-25 北京智芯微电子科技有限公司 映射关系确定方法、装置及存储介质、基站

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