WO2018201966A1 - Procédés et appareils d'accès aléatoire - Google Patents

Procédés et appareils d'accès aléatoire Download PDF

Info

Publication number
WO2018201966A1
WO2018201966A1 PCT/CN2018/084644 CN2018084644W WO2018201966A1 WO 2018201966 A1 WO2018201966 A1 WO 2018201966A1 CN 2018084644 W CN2018084644 W CN 2018084644W WO 2018201966 A1 WO2018201966 A1 WO 2018201966A1
Authority
WO
WIPO (PCT)
Prior art keywords
prach
preamble
base sequence
length
base
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.)
Ceased
Application number
PCT/CN2018/084644
Other languages
English (en)
Inventor
Umer Salim
Bruno Jechoux
Sebastian Wagner
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.)
JRD Communication Shenzhen Ltd
Original Assignee
JRD Communication Shenzhen Ltd
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 JRD Communication Shenzhen Ltd filed Critical JRD Communication Shenzhen Ltd
Priority to CN201880029381.2A priority Critical patent/CN110832943B/zh
Publication of WO2018201966A1 publication Critical patent/WO2018201966A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
    • H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
    • H04W56/007—Open loop measurement
    • H04W56/0075—Open loop measurement based on arrival time vs. expected arrival time
    • H04W56/0085—Open loop measurement based on arrival time vs. expected arrival time detecting a given structure in the signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • 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
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information

Definitions

  • Embodiments of the present disclosure generally relate to random-access (RA) .
  • a random-access (RA) procedure is initiated by a user equipment (UE) to establish a communication link between the UE and a base station (gNB 1100) .
  • UE user equipment
  • gNB 1100 base station
  • 5G New Radio is the name chosen by Third Generation Partnership Project (3GPP) defining the global 5G telecommunications standard for the specification of a new 5G wireless air interface.
  • 3G and 4G communications standards such as current Long Term Evolution (LTE) /LTE advanced standards were directed to connecting people. Instead, 5G/NR will connect everything and provide a unifying connectivity fabric for the next decade and beyond.
  • 5G/NR may bring about a suite of families such as enhanced Mobile Broadband, massive Machine Type Communications, and Ultra-Reliable and Low Latency Communications (URLLC) .
  • URLLC is defined as one of the key target scenarios to be supported by 5G/NR and should provide low latency communications and high reliability (e.g.
  • URLLC reliability requirement for one transmission of a packet is 1-10 -5 for X bytes (e.g., 20 bytes) with a user plane latency of 1ms) and high reliability.
  • concepts from current LTE/LTE advanced standards such as physical uplink control channel (PUCCH) for License Assisted Access (LAA) and enhanced LAA may be further improved upon to provide low latency and high reliability communications and thus further improve link performance.
  • PUCCH physical uplink control channel
  • LAA License Assisted Access
  • enhanced LAA may be further improved upon to provide low latency and high reliability communications and thus further improve link performance.
  • E-MBB Enhanced Mobile Broadband
  • URLLC Ultra-Reliable Low Latency Communication
  • M-MTC Massive Machine-Type Communication
  • the 5G standard should allow sufficient flexibility to support those various requirements efficiently at the same time.
  • the embodiments herein are related to the physical random-access channel (PRACH) to provide enough flexibility to support the heterogeneous services.
  • PRACH physical random-access channel
  • cyclic prefix (CP) is inserted at the beginning of the consecutive multiple/repeated RACH OFDM symbols, CP/GT between RACH symbols is omitted and GT is reserved at the end of the consecutive multiple/repeated RACH symbols
  • Option 2 uses the same sequence in all symbols combined with an orthogonal cover code.
  • Option 4 may use same or different sequences in all symbols.
  • a PRACH preamble may be also referred to as RACH preamble, RA preamble or preamble.
  • 3GPP has agreed on to use at least the basic PRACH preamble structure “Option 1” depicted in Figure 2a without precluding others.
  • the same PRACH sequence S is transmitted every OFDM symbol, which has the advantages to reduce the receiver complexity and to allow for a timing estimation of up to one OFDM symbol length.
  • Option 1 is based on repeating the same PRACH sequence (or PRACH OFDM symbol) without cyclic prefix (CP) between the repetitions, such that one PRACH OFDM symbol acts as a cyclic prefix for the next PRACH OFDM symbol.
  • Option 2/4 has CP inserted for each OFDM symbol.
  • Option 2 has the same sequence in all OFDM symbols modulated with orthogonal cover code while Option 4 has same or different sequences S0-S12 for the repetitions. More details can be found in 3GPP R1-1702127.
  • the sequence consists of multiple OFDM symbols.
  • the number of OFDM symbols is determined by the PRACH format.
  • PRACH format may also be referred to as RA preamble format, preamble format or format.
  • a random-access preamble format comprises one or multiple random access preamble (s)
  • a random-access preamble comprises a preamble sequence
  • a preamble sequence comprises one or multiple PRACH OFDM symbol (s) .
  • the preamble sequence may also be referred to as a PRACH preamble sequence, a PRACH sequence, or a sequence.
  • a set of PRACH formats 0-5 has been proposed for the Option 1.
  • the PRACH formats 0-5 have different lengths of the PRACH preamble such that they can be used for different coverage situations or for different beamforming techniques, see Figure 2b.
  • Each format includes a PRACH burst comprising one or multiple PRACH OFDM symbols and a guard time (GT) .
  • GT guard time
  • the PRACH burst length ensures that the sequence is robust enough for the gNB 1100 to detect and the GT ensures it can tolerate the maximum latency.
  • a slot is used as time unit on the horizontal axis with 14 PUSCH OFDM symbols in each slot but this number can differ.
  • format 0 with 1/4 OFDM symbol GT can support a coverage distance of up to 2.5 km while Format 5, with 3 OFDM symbols GT, can support a cell radius of up to 30 km. If larger distances need to be supported, new formats with larger GT would be defined.
  • Figure 2b shows multiple formats for Option1 but following the same principle, by varying sub-carrier, CP length, number of OFDM symbols etc, multiple formats may be prepared for other PRACH options, e.g., Option 2 and Option 4.
  • a method performed by a user equipment, UE for performing a random access to a base station, BS, in a telecommunication network The UE generates a physical random access channel, PRACH, preamble comprising at least one orthogonal frequency-division multiplexing, OFDM, symbol, wherein each OFDM symbol comprises a base sequence, wherein the base sequence is from a base sequence set, which comprises one or more base sequences of a same length;
  • the UE transmits the PRACH preamble.
  • a UE apparatus including a processor, a storage unit and a communications interface, where the processor unit, storage unit, and communications interface are configured to perform the method (s) as described.
  • a method performed by a base station, BS, in a telecommunication network for detecting a random access from a user equipment, UE.
  • the BS receives a physical random access channel, PRACH, preamble.
  • the PRACH preamble comprising at least one orthogonal frequency-division multiplexing, OFDM, symbol, wherein each OFDM symbol comprises a base sequence, wherein the base sequence is from a base sequence set, which comprises one or more base sequences of a same length.
  • the BS detects a PRACH preamble in m number of receive fast Fourier transform, FFT, windows, wherein m is an integer, and m times a length of the CP is no less than a length of one OFDM symbol.
  • a starting point of a ith FFT window is the starting point in time of a (i-1) th FFT window plus a time period, which is less than or equal to the length of the CP, wherein i is an integer, and 1 ⁇ i ⁇ m.
  • a BS apparatus including a processor, a storage unit and a communications interface, where the processor unit, storage unit, and communications interface are configured to perform the method (s) as described.
  • the methods described herein may be performed by software in machine readable form on a tangible storage medium or computer readable medium e.g. in the form of a computer program comprising computer program code means adapted to perform all the steps of any of the methods described herein when the program is run on a computing device, BS or UE and where the computer program may be embodied on a computer readable medium.
  • tangible (or non-transitory) storage media include disks, thumb drives, memory cards etc. and do not include propagated signals.
  • the software can be suitable for execution on a parallel processor or a serial processor such that the method steps may be carried out in any suitable order, or simultaneously.
  • a computer readable medium comprising a computer program, program code or instructions stored thereon, which when executed on a processor, causes the processor to perform a the methods as described herein.
  • a computer readable medium comprising a computer program, program code or instructions stored thereon, which when executed on a processor, causes the processor to perform the methods described or as described herein.
  • firmware and software can be valuable, separately tradable commodities. It is intended to encompass software, which runs on or controls “dumb” or standard hardware, to carry out the desired functions. It is also intended to encompass software which “describes” or defines the configuration of hardware, such as HDL (hardware description language) software, as is used for designing silicon chips, or for configuring universal programmable chips, to carry out desired functions.
  • HDL hardware description language
  • a telecommunication system comprising at least one of the UE as described herein, and/or at least one of the BS apparatus as described herein.
  • Figure 1 is a schematic overview of a telecommunication network according to some embodiments.
  • Figure 2a illustrates basic structures of PRACH preamble according to some embodiments.
  • Figure 2b illustrates proposed PRACH formats according to some embodiments.
  • Figure 3 illustrates some example PRACH preambles in a PRACH preamble set according to some embodiments.
  • Figure 4 illustrates a BS receives PRACH with beam sweeping according to some embodiments.
  • Figure 5 shows a TA ambiguity problem as solved by some embodiments herein.
  • Figure 6 is a simplified flow chart illustrating an exemplary method performed by a UE according to some embodiments.
  • Figures 7a-7b are simplified block diagrams illustrating an exemplary UE apparatus according to some embodiments.
  • Figure 8 illustrates CP and PRACH Sequence Lengths according to some embodiments.
  • Figure 9 illustrates a BS places multiple receive FFT windows shifted by CP according to some embodiments.
  • Figure 10 is a simplified flow chart illustrating an exemplary method performed by a BS according to some embodiments.
  • FIGS 11a-11b are simplified block diagrams illustrating an exemplary BS apparatus according to some embodiments.
  • the PRACH sequence consists of multiple OFDM symbols. In each PRACH OFDM symbol it may use a different base sequence. These base sequences may be transmitted in frequency domain (following the well-known CP-OFDM technique) or in time domain (following the well-known SC-FDMA technique) . Cyclic shifts may be applied to these base sequences in time domain or in frequency domain to further increase the number of PRACH preambles and hence increase the PRACH capacity.
  • the PRACH preamble inserts cyclic-prefix (CP) for each sub-sequence.
  • multiple PRACH preambles from multiple base sequences may be obtained to get a specific level of identifiability (uniqueness) with a certain number of OFDM symbols. This feature enables the successful detection of PRACH preamble (and UL synchronization) even when base station receives a fraction of the PRACH preamble. According to some embodiments, it is further proposed a receiving method where PRACH can be successfully detected even if uplink receive timing delay (delay spread plus round trip time) is much more than the length of the CP.
  • the base sequence may also be referred to as a sub-sequence, particularly when a PRACH preamble is referred to as a PRACH preamble sequence.
  • ZC sequence is used just as an example of a base sequence, the skilled person will appreciated that they are not limited to ZC sequence, and the same scheme also applies to all sub-sequences.
  • the embodiments may have the following effects:
  • New sequence allows a large increase in the PRACH capacity.
  • the PRACH sequences can be formed from combinations of multiple ZC sequences such that they are identifiable even upon a reception of a number of, not all, PRACH OFDM symbols in the PRACH preamble. This can be used to reduce the PRACH latency.
  • the gNB can use the proposed receiving method to successfully detect the PRACH preambles even when the Received PRACH has a delay (delay spread + Round Trip Time) larger than the CP length.
  • the gNB is able to detect the PRACH from UEs located at larger distances than absorbable by the CP, the preamble formats can be the same between medium to large cells in terms of CP.
  • the telecommunication system comprises a base station (BS) 100 and a UE 700.
  • the telecommunication network may comprise multiple BS 1100 and multiple UEs.
  • the UE 700 may establish a reliable communication link between the UE 700 and the BS 1100 by initiating a random-access (RA) procedure.
  • RA random-access
  • BS may command the UE using DL resources to initiate an UL RA procedure.
  • Examples of the telecommunication that may be used in certain embodiments of the described apparatus, methods and systems may be at least one communication network or combination thereof including, but not limited to, communications networks based on wireless, cellular or satellite technologies such as mobile networks, Global System for Mobile Communications (GSM) , GPRS networks, Wideband Code Division Multiple Access (W-CDMA) , CDMA2000 or Long Term Evolution (LTE) /LTE Advanced networks or any 2nd, 3rd, 4 th or 5 th Generation and beyond type communication networks and the like.
  • GSM Global System for Mobile Communications
  • W-CDMA Wideband Code Division Multiple Access
  • CDMA2000 Code Division Multiple Access 2000
  • LTE Long Term Evolution
  • LTE Advanced networks any 2nd, 3rd, 4 th or 5 th Generation and beyond type communication networks and the like.
  • the UE 700 may be an automotive part with wireless communication capability mounted in a vehicle, a wearable device with wireless communication capability, a mobile terminal, or a wireless terminal, a mobile phone, a computer such as e.g. a laptop, a Personal Digital Assistants PDAs or a tablet computer, sometimes referred to as a surf plate, with wireless capability, or any other radio network units capable to communicate over a radio link in a wireless communications network.
  • a wearable device which is also referred to as wearable communication device, or electronic wearable portable device.
  • the term wearable device refers to electronic technologies or computers that are incorporated into items of clothing and accessories, which can be worn on the body of a user to collect data.
  • the wearable device has some form of communications capability and will allow a server and the wearer access to collect the data.
  • the base station (BS) 1100 is operable in a Radio Access Network (RAN) and serving a cell.
  • the base station 1100 may be, e.g. a Radio Base Station (RBS) , which sometimes may be referred to as e.g. “gNB” , “eNB” , “eNodeB” , “NodeB” , “B node” , gNodeB or BTS (Base Transceiver Station) , depending on the technology and terminology used.
  • the base stations may be of different classes such as e.g. macro eNodeB, home eNodeB or Pico base station, based on transmission power and thereby also cell size.
  • Example of embodiments of a method performed by a UE 700 performing a random access to a base station, BS, in a telecommunication network will now be described with reference to Figure 6.
  • Actions that are optional are presented in dashed boxes.
  • the method may comprise the following actions, which actions may be taken in any suitable order.
  • the UE 700 may receive an indication of the PRACH configuration from the BS.
  • the PRACH preamble will be transmitted by the UE 700 according to a PRACH configuration.
  • the indication of PRACH configuration i.e., PRACH parameters
  • PRACH parameters may comprise at least one of: PRACH preamble format, one or more cyclic shifts, and the time frequency resource where UEs will transmit the PRACH preambles, and a (explicit or implicit) set of base sequences.
  • the indication of the set of base sequences may comprise at least one of: a length of the base sequence, a size of the base set, and each base sequences in the base set. See more details in Action 1010.
  • the base sequences in the base sequence set may be in a form of a rootSequenceIndex, and then the UE generates a base sequence, e.g., a Zaddoff Chu sequence, using the rootSequenceIndex.
  • each base sequence indicator (a simple integer, for example) may represent the set of roots which corresponds to that.
  • each base sequence indicator (a simple integer, for example) may represent the set of roots which corresponds to that.
  • all the UEs in a cell know which set of root sequences (or bases sequences) has been selected by base station for PRACH transmission.
  • the UE 700 generates a physical random access channel, PRACH, preamble comprising at least one orthogonal frequency-division multiplexing, OFDM, symbol.
  • OFDM orthogonal frequency-division multiplexing
  • Each OFDM symbol comprises a base sequence, and optionally a cyclic prefix, CP.
  • the base sequence is from a base sequence set, which comprises one or more base sequences of a same length.
  • the base sequence may be a Zadoff-Chu (ZC) sequence, an M sequence, a pseudo-noise (PN) sequence or any other sequence with desired auto-and cross correlation properties.
  • ZC Zadoff-Chu
  • M M sequence
  • PN pseudo-noise
  • the base sequence in each OFDM symbol can be either the same or different.
  • each base sequence in the PRACH preamble is unique.
  • each base sequence in a PRACH preamble set which comprises all possible PRACH preambles can be generated from the base set allowed in a cell where the BS is serving is unique. It is unique within the cell where the BS is serving, i.e., where the UE is locating. However it is not necessary to be unique in all cells of telecommunication network. That’s to say, the same base sequence may be selected by UEs in two different cells.
  • every n number of consecutive base sequences in the PRACH preamble is unique, wherein n is an integer, and n ⁇ 2.
  • every n number of consecutive base sequences in the PRACH preamble set is unique. It is unique within the cell the BS is serving, i.e., where the UE is locating. Considering all cells of telecommunication network, it may be also unique, but not necessary.
  • the value of n is any integer which can uniquely distinguish the PRACH preamble only on the n number of OFDM symbol, e.g., 1 or 2, etc.
  • each base sequence in the base sequence set is unique in all cells of the telecommunication network.
  • one base sequence is only comprised in one base sequence set, not repeated in any other base sequence set in other cells of the telecommunication network.
  • a device in a core network may determine such a unique set for all cells served by BSs, and then inform the BSs of them, respectively.
  • the UE 700 performs a cyclic shift of the PRACH preamble in either a time domain or a frequency domain according to the PRACH configuration.
  • Action 630 When Action 630 is performed, a cyclic shifted PRACH preamble is transmitted in Action 640.
  • Performing a cyclic shift of the PRACH preamble means performing the same cyclic shift of all the sub-sequences in the PRACH preamble.
  • Performing a cyclic shift of the PRACH preamble comprises one or more cyclic shifts in order to generate one or more cyclic shifted PRACH preamble.
  • the indication of the cyclic shift may be received from the BS as part of PRACH configuration.
  • the cyclic shifted PRACH preamble is as good as the PRACH preamble before cyclic shift applied. By performing the cyclic shift, the allowed set of PRACH preambles for the users in the cell becomes large.
  • the UE transmits the PRACH preamble.
  • Transmitting the PRACH preamble may be referred to as transmitting (640) a PRACH, a PRACH signal, or a preamble.
  • the base sequences which make data part of OFDM symbols may be transmitted in a time domain, e.g., as in Single-carrier FDMA (SC-FDMA) manner, or in a frequency domain, e.g., as in CP-OFDM manner. More specifically, there may be two possibilities how the base sequence makes a data part of one OFDM symbol.
  • base sequence transmission is performed in frequency domain, like conventional CP-OFDM manner.
  • the base sequence is placed on PRACH allocated frequency sub-carriers, which may be assigned by the BS.
  • IFFT is performed by the UE on this frequency placed base sequence to obtain the data part of the OFDM symbol.
  • base sequence transmission is performed in time domain, like in SC-FDMA manner: the UE would first do an FFT to convert the base sequence from time domain to frequency domain. Then these frequency domain coefficients (i.e., the FFT of base sequence) would be mapped on a time frequency grid corresponding to a PRACH frequency resource, which may be assigned by the BS.Then IFFT is performed by the UE on this frequency placed FFT-base-sequence to obtain the data part of the OFDM symbol. A fraction of the data part of the OFDM symbol is used as cyclic prefix (CP) for both cases.
  • CP cyclic prefix
  • a sum of a delay spread and a round trip delay of the UE is larger than the length of the CP of the PRACH symbols.
  • This solution has the advantage of acquiring UL synchronization even in case of wherein a sum of a delay spread and a round trip delay larger than one OFDM symbol (use case for large cells) .
  • This solution has the advantage of acquiring UL synchronization also in case of beam sweeping at gNB side.
  • acquiring fast UL synchronization in case of low latency UE e.g. URLLC
  • fast UL synchronization is achievable from a single PRACH symbol.
  • Figure 7a illustrates various components of an exemplary computing-based device 700 which may be implemented to include the functionality of the transmitting a PRACH as described, by way of example only, with respect to an UE 700 as described with reference to Figure 1.
  • the computing-based device 700 comprises one or more processors 702 which may be microprocessors, controllers or any other suitable type of processors for processing computer executable instructions to control the operation of the device in order to perform measurements, receive measurement reports, schedule and/or allocate communication resources as described in the process (es) and method (s) as described herein.
  • processors 702 may be microprocessors, controllers or any other suitable type of processors for processing computer executable instructions to control the operation of the device in order to perform measurements, receive measurement reports, schedule and/or allocate communication resources as described in the process (es) and method (s) as described herein.
  • the processors 702 may include one or more fixed function blocks (also referred to as accelerators) which implement the methods and/or processes as described herein in hardware (rather than software or firmware) .
  • fixed function blocks also referred to as accelerators
  • Platform software and/or computer executable instructions comprising an operating system 704A or any other suitable platform software may be provided at the computing-based device to enable application software to be executed on the device.
  • software and/or computer executable instructions may include the functionality of perform measurements, receive measurement reports, determine communication resources and/or the functionality of the UE 700 according to the embodiments herein as described according to the embodiments herein.
  • Computer-readable media may include, for example, computer storage media such as memory 704 and communications media.
  • Computer storage media, such as memory 704 includes volatile and non-volatile, removable and non-removable media implemented in any method or technology.
  • a data store 704A of the memory 704 is configured for storage of information such as computer readable instructions, data structures, program modules or other data, S.
  • Computer storage media may include, but is not limited to, RAM, ROM, EPROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information for access by a computing device.
  • communication media may embody computer readable instructions, data structures, program modules, or other data in a modulated data signal, such as a carrier wave, or other transport mechanism.
  • computer storage media does not include communication media.
  • the computer storage media (memory 704) is shown within the computing-based device 700 it will be appreciated that the storage may be distributed or located remotely and accessed via a network or other communication link (e.g. using communication interface 706) .
  • the computing-based device 700 may also optionally or if desired comprises an input/output controller 710 arranged to output display information to a display device 712 which may be separate from or integral to the computing-based device 700.
  • the display information may provide a graphical user interface.
  • the input/output controller 710 is also arranged to receive and process input from one or more devices, such as a user input device 714 (e.g. a mouse or a keyboard) . This user input may be used to set scheduling for measurement reports, or for allocating communication resources, or to set which communications resources are of a first type and/or of a second type etc.
  • the display device 712 may also act as the user input device 714 if it is a touch sensitive display device.
  • the input/output controller 710 may also output data to devices other than the display device, e.g. other computing devices via communication interface 706, any other communication interface, or a locally connected printing device/computing devices etc.
  • Figure 7b illustrates a scheme of an UE 700 as described with reference to Figure 1 and according to another embodiment.
  • the UE 700 comprises a receiving module 781, a generating module 782, a cyclic shifting module 783, and a transmitting module 784, which are configured to perform the Actions 610-640, respectively.
  • Example embodiments of method performed by a BS 1100 in a telecommunication network for detecting a random access from a User Equipment, UE will now be described with reference to a flowchart depicted in Figure 10.
  • the method comprises the following actions, which actions may be taken in any suitable order. Actions that are optional are presented in dashed boxes.
  • the BS 1100 may transmit an indication of the PRACH configuration to the UE 700, e.g., as part of the downlink system information.
  • This indication of PRACH configuration may comprise at least one of: a PRACH preamble format, a PRACH time and frequency resource, one or more cyclic shifts allowed by the BS, and a (explicit or implicit) set of base sequences.
  • the indication of the set of base sequences may comprise at least one of: a length of the base sequence, a size of the base set, and each base sequences in the base set.
  • the PRACH preamble is prepared from the base set according to the preamble format and selected randomly among all possible preambles which are allowed in this cell according to the PRACH configuration.
  • UEs may initiate the RACH procedure by transmitting PRACH preamble according to the PRACH configuration.
  • the BS 1100 receives a physical random access channel, PRACH, preamble.
  • PRACH physical random access channel
  • the PRACH preamble may comprise at least one orthogonal frequency-division multiplexing, OFDM, symbol, wherein each OFDM symbol comprises a base sequence, and optionally a cyclic prefix, CP, wherein the base sequence is from a base sequence set, which comprises one or more base sequences of a same length.
  • OFDM orthogonal frequency-division multiplexing
  • CP cyclic prefix
  • the BS 1100 may detect the PRACH preamble in m number of fast Fourier transform, FFT, windows, wherein m is an integer, and m times a length of the CP is no less than a length of one OFDM symbol.
  • FFT fast Fourier transform
  • Action 1030 is not limited to any specific PRACH preamble format.
  • a FFT window may be also referred to as a receive window, a receive FFT window or a window in short.
  • a starting point of a ith FFT window is the starting point in time of a (i-1) th FFT window plus a time period, which is less than or equal to the length of the CP, wherein i is an integer, and 1 ⁇ i ⁇ m.
  • the starting point of the CP of the received PRACH may fall in the FFT window.
  • the FFT window in which a starting point of the CP of the received PRACH preamble is contained will provide the best correlation result.
  • the Length of one OFDM symbol comprises the data (sub-sequence) part plus the length of the cyclic prefix when the CP is included.
  • CP*m may be no less than the length of the OFDM symbol length.
  • CP*m may be at least be equal to the length of the OFDM symbol length, examples are given below.
  • Figure 11a illustrates various components of an exemplary computing-based device 1100 which may be implemented to include the functionality of the transmitting a PRACH as described, by way of example only, with respect to a BS 1100 as described with reference to Figure 1.
  • the computing-based device 1100 comprises one or more processors 1102 which may be microprocessors, controllers or any other suitable type of processors for processing computer executable instructions to control the operation of the device in order to perform measurements, receive measurement reports, schedule and/or allocate communication resources as described in the process (es) and method (s) as described herein.
  • processors 1102 may be microprocessors, controllers or any other suitable type of processors for processing computer executable instructions to control the operation of the device in order to perform measurements, receive measurement reports, schedule and/or allocate communication resources as described in the process (es) and method (s) as described herein.
  • the processors 1102 may include one or more fixed function blocks (also referred to as accelerators) which implement the methods and/or processes as described herein in hardware (rather than software or firmware) .
  • fixed function blocks also referred to as accelerators
  • Platform software and/or computer executable instructions comprising an operating system 1104A or any other suitable platform software may be provided at the computing-based device to enable application software to be executed on the device.
  • software and/or computer executable instructions may include the functionality of perform measurements, receive measurement reports, determine communication resources and/or the functionality of the BS 1100 according to the embodiments herein as described according to the embodiments herein.
  • Computer-readable media may include, for example, computer storage media such as memory 1104 and communications media.
  • a data store 1104A of the memory 1104 is configured for storage of information such as computer readable instructions, data structures, program modules or other data, S.
  • Computer storage media may include, but is not limited to, RAM, ROM, EPROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information for access by a computing device.
  • communication media may embody computer readable instructions, data structures, program modules, or other data in a modulated data signal, such as a carrier wave, or other transport mechanism.
  • computer storage media does not include communication media.
  • the computer storage media (memory 1104) is shown within the computing-based device 1100 it will be appreciated that the storage may be distributed or located remotely and accessed via a network or other communication link (e.g. using communication interface 1106) .
  • the computing-based device 1100 may also optionally or if desired comprises an input/output controller 1110 arranged to output display information to a display device 1112 which may be separate from or integral to the computing-based device 1100.
  • the display information may provide a graphical user interface.
  • the input/output controller 1110 is also arranged to receive and process input from one or more devices, such as a user input device 1114 (e.g. a mouse or a keyboard) . This user input may be used to set scheduling for measurement reports, or for allocating communication resources, or to set which communications resources are of a first type and/or of a second type etc.
  • the display device 1112 may also act as the user input device 1114 if it is a touch sensitive display device.
  • the input/output controller 1110 may also output data to devices other than the display device, e.g. other computing devices via communication interface 1106, any other communication interface, or a locally connected printing device/computing devices etc.
  • FIG 11b illustrates a scheme of a BS 1100 as described with reference to Figure 1 and according to another embodiment.
  • the BS 1100 comprises a transmitting module 1181, a receiving module 1182, and a detecting module 1183, which are configured to perform the Actions 1010-1030, respectively.
  • PRACH preambles are generated from a set of base sequences (or sub-sequences) . These sub-sequences have the same length.
  • This base set is the set of ZC sequences of a certain length L, with this set comprising up to (L-1) ZC sequences corresponding to all possible roots 1 to L-1.
  • Each single PRACH preamble consists of multiple sub-sequences (which can be the same or different) , taken from the base set.
  • Each PRACH preamble consists of N PRACH OFDM symbols, each OFDM symbol with its data (sub-sequence) and cyclic prefix (CP) .
  • the data part of OFDM symbol is a sub-sequence from the base set.
  • the base sequence is used in the frequency domain, and then after inverse fast Fourier transform (IFFT) , a cyclic prefix is added in the time domain.
  • IFFT inverse fast Fourier transform
  • Another way to construct preambles is to use the base sequence in time domain, perform FFT operation to convert it in frequency domain, use these frequency coefficients on RACH frequency resources, perform IFFT and transmit after adding CP.
  • a, b, c, d denote base sequences of the same length L, e.g., ZC sequences of length L, with different roots.
  • x y donates a base sequence x with a cyclic shift y, for instance, a i denotes the base sequence a with a cyclic shift “i” .
  • GT denotes the guard time.
  • Seq donates a base sequence.
  • This capacity increases exponentially with the number of PRACH OFDM symbols for the proposed scheme. This capacity increase is a major advantage of this proposal over Option1 and Option 2.
  • ZC sequences show better cross-correlation properties among different roots if the difference of these roots is relative prime with respect to the length of the ZC sequence (L) .
  • power spectrum characteristics of some roots may be better than others.
  • the number of sub-sequences which should preferably be used for the above computation could be less than L-1.
  • PRACH preambles are formed without any constraint on how many different sub-sequences constitute a PRACH preamble, and different PRACH preambles differ from each other on how many OFDM symbols, PRACH capacity becomes huge but there are two important disadvantages:
  • the preamble set can be further extended (step 2 of Preamble construction) by creating cyclic shifted preambles for each preamble formed in step 1.
  • a device in the core network can choose to assign different sets of base sequences to neighbouring cells.
  • neighbouring cells can be allocated the preambles where PRACH preambles (even the sub-sequences) of each cell are completely unique, which means it is unique in all cells.
  • the BS may send the PRACH configuration to be used in a cell as part of the downlink system information.
  • each OFDM symbol of each PRACH preamble is unique.
  • the preamble set for each cell may be such that no sub-sequence is repeated not only in one preamble but also in the set of available preambles, i.e., each constituent sub-sequence appears only once.
  • Example of two such preambles would be “abcd” and “efgh” (CP not mentioned here for sake of simplicity) .
  • Step 2 of preamble construction would allow generating further sequences with the cyclic shifts applied to these two PRACH sequences.
  • allowed PRACH preamble set may be such that every 2 OFDM symbols for all preambles in this allowed preamble set are unique. Further to have correct time identifiability upon reception of 2 OFDM symbols in each preamble, each preamble may be unique within itself for each set of 2 OFDM symbols. As an example, a 4 OFDM symbol length preamble consisting of “aaab” does not satisfy this requirement as the OFDM symbol (1, 2) and OFDM symbol (2, 3) are same and would not let gNB identify the correct timing.
  • reception of any 2 OFDM symbols would allow gNB to distinctly identify which part of which preamble it has received. So, it can identify the PRACH preamble and resolve completely the timing of the sender UE.
  • the antenna with multiple elements can be used to form a narrow beam with very high gain to cover one specific direction. Beams can sweep the whole coverage area of the serving cell. Since one beam can only cover a very narrow area, it is less possible for gNB with beam sweeping to support frequency division multiplexed (FDMed) multi-UE multiplexing because the probability of two or more UEs under scheduling located in the same beam is much smaller than that of a wide beam, therefore, it limits the possibility to multiplex those two users in frequency in a given beam. So it could be very often that just a single UE is scheduled in one beam and considering the huge bandwidth of high frequency, the resource block scheduled to this UE could be huge. To improve the scheduling flexibility, it is envisaged to adopt a short beam duration in time domain to reduce the scheduled resource block size. This very short duration is called “mini-slot” which could be as short as 1 or 2 OFDM symbols long.
  • mini-slot This very short duration is called “mini-slot” which could be as short as 1 or 2 OFDM symbols long.
  • Beam duration is selected as an integer number of PUSCH symbols which includes CP and different SCS (subcarrier spacing) could be used for PUSCH and PRACH which means the PUSCH and PRACH symbol lengths could be different.
  • SCS subcarrier spacing
  • the beam duration could be a mini-slot if a low SCS is used or several complete slots if a high SCS is used.
  • the gNB might be able to detect the PRACH preamble and TA value from the received segment (s) .
  • a propagation delay may also be referred to as a propagation latency, a round trip propagation delay or latency, a round trip time (RTT) , a latency due to propagation, a latency etc.
  • One target of PRACH is for the terminal to achieve UL synchronization.
  • a terminal When a terminal is switched on, it will synchronize with the DL first and read the system information for UL access (including relevant PRACH parameters) .
  • the terminal When the terminal initiates an UL transmission without valid TA, it sends a PRACH burst with 0 TA (Time Advance) from its DL timing and certainly, this burst will be received by the gNB after a round trip propagation delay.
  • the gNB can indicate the terminal a TA value so that UL transmission with this indicated TA value can be aligned in time with the gNB clock.
  • a TA ambiguity problem when gNB only receives with a specific beam during the FFT duration is shown in Figure 5 with respect to different PRACH preamble options, namely Option 1, Option 2 and Option 4.
  • “Proposal” donates the solution proposed according to some embodiment of the invention.
  • the gNB 1100 receiving (Rx) window is shown.
  • T donates the length of one OFDM symbol.
  • beam duration is equal to, e.g., 3 OFDM symbols.
  • the gNB can detect the difference from phase shift in frequency domain, i.e. ⁇ T.
  • TA ⁇ T ⁇ T.
  • Option 1 and Option 4 can provide precis timing, but not Option 2.
  • the gNB can only detect ⁇ t again with Option 1.
  • the detected ⁇ t part is the part less than one OFDM symbol from the segment received in one beam.
  • TA x OFDM symbol period + ⁇ T, here x is 2. Since gNB doesn’t know UE position within the cell, it cannot be certain of the TA value. It is called TA ambiguity for latency bigger than one OFDM symbol. Such a TA ambiguity problem can only be solve by the receiving method according to some embodiments of the invention.
  • Option 1 which consists of repetition of one sub-sequence multiple times will cause time ambiguity upon reception of a fraction of PRACH preamble.
  • the problem may be more severe with Option 2 as gNB would not even be able to detect the preamble due to incomplete reception of orthogonal cover code.
  • This time ambiguity problem can be solved by using the PRACH preambles formed for better identifiability as explained. These preambles have controlled repetition of sub-sequences designed for certain level of uniqueness and thus even the reception of a fraction of PRACH preamble allows gNB to correctly identify the PRACH preamble and the correct UE timing without TA ambiguity.
  • each OFDM symbol of PRACH preamble may be unique.
  • the preamble set may be such where no sequence is repeated not only in one preamble but also in the set of available preambles.
  • gNB may indicate the users to use the PRACH preamble set where PRACH preambles are unique for each 2 OFDM symbols.
  • gNB For PRACH preambles which are unique within “n” OFDM symbols, gNB only needs to receive “n” complete OFDM symbols. Practically it would require gNB to have the beam duration of “n+1” OFDM symbols to completely capture “n” complete OFDM symbols.
  • the proposed PRACH preamble can be quite useful in the following use cases where PRACH preambles of Option 1 are not very efficient:
  • some embodiments herein describe the criteria to adjust the uniqueness of PRACH preambles which are suitable for the beam sweeping durations.
  • the proposed solution is very beneficial for scenarios when there are a large number of MTC devices with severe energy constraints.
  • the RACH collision probability should be minimal to avoid waste of energy.
  • the proposed preamble provides very large PRACH capacity as it allows combinations of multiple sub-sequences used in the same sequence. This large PRACH capacity directly translates into very small collision probability providing a very positive energy benefit.
  • the idea is to do multiple fast Fourier transform (FFT) windows per OFDM symbol delayed each by CP length as shown in Figure 9.
  • FFT fast Fourier transform
  • the FFT window for which the CP part of the window contains the starting point of the received PRACH symbol will provide the best correlation results.
  • contiguous OFDM symbols can be coherently combined which are received with the same lag FFT window.
  • the power comparison of results from multiple windows will indicate which FFT window contains the start of the PRACH preamble and indicate the correct UE timing.
  • Advantage of some embodiments comprises handling of uplink PRACH delays larger than CP length:
  • the gNB can use the proposed receiving method to successfully detect the PRACH preambles even when the Received PRACH has a delay (delay spread + Round Trip Time) larger than the CP length.
  • gNB is able to detect the PRACH from UEs located at larger distances than absorbable by the CP, the preamble formats can be the same between medium to large cells in terms of CP.
  • Figure 9 shows a gNB placing multiple receive (FFT) windows shifted by CP.
  • the embodiment according to Figure 9 is not limited to any specific PRACH Option or any specific PRACH preamble format.
  • This aspect is to fight the delay spread.
  • PRACH preamble transmission as uplink synchronization is not there, CP would absorb the round trip time as well.
  • RTT could be many times more than the delay spread thus very large CPs are required. This translates into large power consumption at the UEs in CP which are thrown away at the receiver so this energy gets completely wasted.
  • Figure 8 shows the PRACH sequence and CP lengths for PRACH preamble formats used in LTE.
  • T-CP donates length of CP in Timeslots
  • T-CP in ms) length of CP in millisecond
  • T-SEQ donotes length of Sequence in Timeslots
  • T-SEQ in ms
  • Total Length in Ts
  • Guard Time in ms
  • Cell Radius is roughly the distance that this specific preamble format allows for correct detection. .
  • CP is 11%of the PRACH transmission.
  • CP length is 46%and 30%of the PRACH transmission length respectively. This clearly indicates the important fraction of UE energy which gets wasted in CP. Keeping in view these configurations, the embodiments herein may be particularly applicable for mMTC devices where energy efficiency is the prime metric of communication.
  • ⁇ PRACH preamble comprising of multiple sub-sequences with cyclic prefix introduced for each sub-sequence.
  • ⁇ PRACH preamble where sub-sequences of same length and different roots are used in each preamble with cyclic prefix.
  • ⁇ PRACH preamble construction which allows unique identifiability of the preamble and timing resolution upon reception of a fraction of the preamble.
  • PRACH preamble construction where PRACH preamble capacity and the detection complexity (in terms of how many different sub-sequences are allowed to make PRACH preamble set in a cell) trade-off can be solved.
  • ⁇ PRACH preamble construction for beam-sweeping which can be adapted to have PRACH detection and TA resolution for any number of OFDM symbols (1, 2, 3, etc) to match (or adjust with) the beam duration.
  • ⁇ Receiving method for correct PRACH detection by placing multiple receive FFT windows delayed each by CP allowing successful PRACH detection when the sum of the DS and RTT may be larger than CP.
  • detection of PRACH preamble consist of using only one receive window which is aligned to the downlink timing.
  • ⁇ Receiving method for correct PRACH detection by placing multiple FFT windows delayed by CP where multiple OFDM symbols of the same lag window can be combined coherently or non-coherently to obtain better detection performance of the correct timing.
  • ⁇ Receiving method for correct PRACH detection by placing multiple FFT windows delayed by CP which allows UL synchronization from PRACH even if CP of PRACH is smaller than DS+RTT allowing the unification of PRACH configurations.
  • ′computer′ is used herein to refer to any device with processing capability such that it can execute instructions.
  • ′computer′ or ′computing device′ includes PCs, servers, base stations, eNBs, network nodes and other network elements, mobile telephones, UEs, personal digital assistants, other portable wireless communications devices and many other devices.
  • a remote computer may store an example of the process described as software.
  • a local or terminal computer may access the remote computer and download a part or all of the software to run the program.
  • the local computer may download pieces of the software as needed, or execute some software instructions at the local terminal and some at the remote computer (or computer network) .
  • the remote computer or computer network
  • ′an′ item refers to one or more of those items.
  • ′comprising′ is used herein to mean including the method blocks, features or elements identified, but that such blocks, features or elements do not comprise an exclusive list and a method or apparatus may contain additional blocks, features or elements.

Landscapes

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

Abstract

L'invention concerne des procédés et un appareil d'accès aléatoire. L'UE génère un préambule de canal physique d'accès aléatoire, PRACH, comprenant au moins un symbole de multiplexage par répartition orthogonale de la fréquence (OFDM), chaque symbole OFDM comprenant une séquence de base, la séquence de base étant constituée à partir d'un ensemble de séquences de base, qui comprend une ou plusieurs séquences de base d'une même longueur ; l'UE transmet le préambule PRACH. La BS détecte un préambule PRACH dans un nombre m de fenêtres de transformées de Fourier rapides, FFT, m étant un nombre entier, et m fois une longueur du CP n'étant pas inférieure à une longueur d'un symbole OFDM.
PCT/CN2018/084644 2017-05-05 2018-04-26 Procédés et appareils d'accès aléatoire Ceased WO2018201966A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201880029381.2A CN110832943B (zh) 2017-05-05 2018-04-26 随机接入的方法和设备

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1707178.8 2017-05-05
GB1707178.8A GB2562099A (en) 2017-05-05 2017-05-05 Methods and apparatuses for random-access

Publications (1)

Publication Number Publication Date
WO2018201966A1 true WO2018201966A1 (fr) 2018-11-08

Family

ID=59065583

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2018/084644 Ceased WO2018201966A1 (fr) 2017-05-05 2018-04-26 Procédés et appareils d'accès aléatoire

Country Status (3)

Country Link
CN (1) CN110832943B (fr)
GB (1) GB2562099A (fr)
WO (1) WO2018201966A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020220894A1 (fr) * 2019-04-30 2020-11-05 大唐移动通信设备有限公司 Procédé, appareil et dispositif de configuration et d'indication de ressources de liaison montante
WO2021062666A1 (fr) * 2019-09-30 2021-04-08 Zte Corporation Système et procédé pour configurer des ressources de transmission et effectuer des communications rach dans des réseaux de communication sans fil
WO2021076038A1 (fr) * 2019-10-18 2021-04-22 Telefonaktiebolaget Lm Ericsson (Publ) Détection de préambule d'accès aléatoire pour retard de propagation
CN114270762A (zh) * 2019-08-14 2022-04-01 高通股份有限公司 基本序列的组跳频增强
CN116349209A (zh) * 2020-11-02 2023-06-27 高通股份有限公司 用于o-ru的prach处理
US12267186B2 (en) 2022-09-22 2025-04-01 Nokia Solutions And Networks Oy Preamble matrix

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR112019027669A2 (pt) * 2017-06-27 2020-07-07 Ntt Docomo, Inc. terminal e método de transmissão de preâmbulo
WO2020076201A1 (fr) * 2018-10-08 2020-04-16 Telefonaktiebolaget Lm Ericsson (Publ) Détection de prach dans un réseau d'accès radio
CN113391122A (zh) * 2021-06-09 2021-09-14 中电科思仪科技股份有限公司 一种提高频谱监测信道选择性的方法
EP4468665A4 (fr) * 2022-02-18 2025-05-07 Samsung Electronics Co., Ltd Procédé et dispositif de détection d'un signal de préambule d'un canal d'accès aléatoire dans une station de base d'un système de communication sans fil

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101247658A (zh) * 2008-03-19 2008-08-20 中兴通讯股份有限公司 物理随机接入信道的映射方法
CN101335713A (zh) * 2008-07-25 2008-12-31 中兴通讯股份有限公司 物理随机接入信道的传输方法及确定频域初始位置的方法
CN106105361A (zh) * 2014-03-25 2016-11-09 瑞典爱立信有限公司 随机接入前导码信号的发送和接收

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200805910A (en) * 2006-06-19 2008-01-16 Interdigital Tech Corp Method and apparatus for performing random access in a wireless communication system
US8295243B2 (en) * 2006-08-21 2012-10-23 Qualcomm Incorporated Method and apparatus for random access in an orthogonal multiple-access communication system
KR101149389B1 (ko) * 2007-03-20 2012-06-04 알카텔-루센트 유에스에이 인코포레이티드 무선 통신 시스템에서 범위 확장을 위해 구성가능한 랜덤 액세스 채널 구조
US8773968B2 (en) * 2007-08-06 2014-07-08 Texas Instruments Incorporated Signaling of random access preamble sequences in wireless networks
CN101409584A (zh) * 2007-10-12 2009-04-15 Nxp股份有限公司 无线通信系统的随机接入前同步码和接收方案
US8391382B2 (en) * 2009-07-14 2013-03-05 Lg Electronics Inc. Method and apparatus for generating ranging preamble code in wireless communication system
KR101181976B1 (ko) * 2010-09-28 2012-09-11 주식회사 이노와이어리스 프리앰블 시퀀스 검출 장치
US9160511B2 (en) * 2012-01-30 2015-10-13 Qualcomm Incorporated Cyclic prefix in evolved multimedia broadcast multicast service with high transmit power
US10285195B2 (en) * 2014-06-11 2019-05-07 Telefonaktiebolaget Lm Ericsson (Publ) Processing of random access preamble sequences
WO2015190961A1 (fr) * 2014-06-13 2015-12-17 Telefonaktiebolaget L M Ericsson (Publ) Ensembles de préambules adaptés à des conditions de transmission en liaison montante
EP3241321B1 (fr) * 2014-12-29 2019-10-23 Telefonaktiebolaget LM Ericsson (publ) Procédés et dispositifs permettant de générer et de détecter des préambules d'accès aléatoire

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101247658A (zh) * 2008-03-19 2008-08-20 中兴通讯股份有限公司 物理随机接入信道的映射方法
CN101335713A (zh) * 2008-07-25 2008-12-31 中兴通讯股份有限公司 物理随机接入信道的传输方法及确定频域初始位置的方法
CN106105361A (zh) * 2014-03-25 2016-11-09 瑞典爱立信有限公司 随机接入前导码信号的发送和接收

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020220894A1 (fr) * 2019-04-30 2020-11-05 大唐移动通信设备有限公司 Procédé, appareil et dispositif de configuration et d'indication de ressources de liaison montante
CN114270762A (zh) * 2019-08-14 2022-04-01 高通股份有限公司 基本序列的组跳频增强
WO2021062666A1 (fr) * 2019-09-30 2021-04-08 Zte Corporation Système et procédé pour configurer des ressources de transmission et effectuer des communications rach dans des réseaux de communication sans fil
US12328774B2 (en) 2019-09-30 2025-06-10 Zte Corporation System and method for configuring transmission resources and performing RACH in wireless communication networks
WO2021076038A1 (fr) * 2019-10-18 2021-04-22 Telefonaktiebolaget Lm Ericsson (Publ) Détection de préambule d'accès aléatoire pour retard de propagation
CN114557113A (zh) * 2019-10-18 2022-05-27 瑞典爱立信有限公司 针对传播延迟的随机接入前同步码检测
US20220394780A1 (en) * 2019-10-18 2022-12-08 Telefonaktiebolaget Lm Ericsson (Publ) Random access preamble detection for propagation delay
CN114557113B (zh) * 2019-10-18 2024-10-22 瑞典爱立信有限公司 针对传播延迟的随机接入前同步码检测
US12185388B2 (en) * 2019-10-18 2024-12-31 Telefonaktiebolaget L M Ericsson (Publ) Random access preamble detection for propagation delay
CN116349209A (zh) * 2020-11-02 2023-06-27 高通股份有限公司 用于o-ru的prach处理
US12267186B2 (en) 2022-09-22 2025-04-01 Nokia Solutions And Networks Oy Preamble matrix

Also Published As

Publication number Publication date
GB2562099A (en) 2018-11-07
CN110832943A (zh) 2020-02-21
GB201707178D0 (en) 2017-06-21
CN110832943B (zh) 2024-01-19

Similar Documents

Publication Publication Date Title
WO2018201966A1 (fr) Procédés et appareils d'accès aléatoire
US12068998B2 (en) Random access preamble slot allocation
JP6983919B2 (ja) 通信ネットワークへの無線デバイスのネットワークアクセス
US10701735B2 (en) Methods and devices for generating and detecting random access preambles
JP6719622B2 (ja) ビーム走査時間インジケータ
US10743351B2 (en) Method and wireless device for transmitting random-access preamble by means of single-tone method
EP3863204B1 (fr) Procédé d'émission de signal de synchronisation, appareil de réseau et appareil terminal
JP6960944B2 (ja) 基地局装置、端末装置、および、通信方法
TWI686070B (zh) 用於在分時雙工模式的窄頻物聯網（nb-iot）傳輸的nb-iot實體隨機存取頻道（nprach）格式
EP2647251B1 (fr) Affectation implicite de ressources utilisant une séquence de synchronisation décalée
CN115361745A (zh) 在载波频率中执行基于竞争的随机接入的方法和装置
KR101903358B1 (ko) Sc-fdma 에서의 프리앰블 없는 업링크 동기화
US20180234965A1 (en) Method and apparatus for transmitting data in unlicensed band
JP2010220258A (ja) 移動局装置、基地局装置、送信方法および受信方法
JP2013176094A (ja) 無線通信システムにおける距離範囲拡大のための構成可能なランダム・アクセス・チャネル構造
KR101790530B1 (ko) 고주파 대역을 지원하는 무선 접속 시스템에서 단계별 상향링크 동기 신호 검출 방법 및 장치
CN111919481B (zh) 用于无线通信系统中的上行链路传输的方法、设备和计算机可读介质
US10645731B2 (en) Random access enhancement based on scalable signature design
CN105493582A (zh) 用于在支持高频带的无线接入系统中在每个步骤中检测上行链路同步信号的方法和设备
US11659601B2 (en) Transmission device, reception device, transmission method, and reception method for random access operation
GB2562100A (en) Methods and apparatuses for random-access
CN107615868B (zh) 随机接入前置码信号构建
WO2018078639A1 (fr) Canal d'accès aléatoire physique pour un mode duplex à répartition dans le temps de l'internet des objets à bande étroite
WO2018171524A1 (fr) Procédés et dispositifs associés à un processus de synchronisation avec balayage de faisceau dans un réseau d'accès radio
CN111434135A (zh) 第一ofdma传输和第二ofdma传输的频率复用

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18793901

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18793901

Country of ref document: EP

Kind code of ref document: A1