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WO2019201484A1 - Système de nr 5g pour communication avec un terminal d'utilisateur - Google Patents

Système de nr 5g pour communication avec un terminal d'utilisateur Download PDF

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Publication number
WO2019201484A1
WO2019201484A1 PCT/EP2019/051362 EP2019051362W WO2019201484A1 WO 2019201484 A1 WO2019201484 A1 WO 2019201484A1 EP 2019051362 W EP2019051362 W EP 2019051362W WO 2019201484 A1 WO2019201484 A1 WO 2019201484A1
Authority
WO
WIPO (PCT)
Prior art keywords
local radio
synchronisation signal
equipments
user terminal
local
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/EP2019/051362
Other languages
English (en)
Inventor
Christophe Gruet
Gil Botet
Pierre TANE
Roger Jacques
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.)
Kontron Transportation France SAS
Original Assignee
Kapsch CarrierCom France SAS
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 Kapsch CarrierCom France SAS filed Critical Kapsch CarrierCom France SAS
Publication of WO2019201484A1 publication Critical patent/WO2019201484A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/088—Hybrid systems, i.e. switching and combining using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/06—Reselecting a communication resource in the serving access point

Definitions

  • the present invention relates to a system for communica tion with a user terminal, wherein the system is configured to communicate with the user terminal according to a 5G NR (5th Generation New Radio) standard having an OFDM (Orthogonal Fre quency Division Multiplex) structure in which a set of synchro nisation signal blocks containing the same physical cell ID (identification) is repeatedly broadcast with a predetermined repetition period, the synchronisation signal blocks of said set being broadcast successively in time, each synchronisation signal block of said set over a different antenna.
  • a 5G NR Fifth Generation New Radio
  • OFDM Orthogonal Fre quency Division Multiplex
  • the 5G NR standard devised by the 3GPP (3rd Generation Partnership Project) consortium, is defined in specifications 3GPP TS 38. XXX ("Series 38") and is generally also known as LTE Release 15.
  • the term "5G NR standard” used herein covers all equivalent and subsequent standards based thereon.
  • an array of antennas with very nar row but long coverage areas is used to operate in high fre quency spectrums .
  • These "beamforming" antennas are arranged in a circular fashion on a node to be able to communicate with user terminals in any angular directions thereof.
  • the 5G NR standard provides tools for the initial access of user terminals as they do not know in which coverage area of the multitude of antennas they are located.
  • the 5G NR standard employs an OFDM structure in which a set of syn chronisation signal blocks containing the same physical cell ID is repeatedly broadcast with a predetermined repetition period, the synchronisation signal blocks of said set been broadcast successively in time, each synchronisation signal block of said set over a different antenna. In practice this means that a "sweeping" is performed over the antennas - first one antenna broadcasts one signal block, thereafter a different antenna broadcasts a different signal block, and so forth.
  • a user terminal located in one of the narrow coverage ar eas will receive only one signal synchronisation block and can determine its position in the OFDM structure by means of the timing and content of the signal synchronisation block. This yields an effective initial access for high frequency beamform ing systems.
  • the user equip ment After receiving the synchronisation signal block, which is commonly known as the discovery phase, the user equip ment is able to acquire system information broadcast by the system and thereupon access the random access channel (RACH) to establish a bidirectional communication.
  • RACH random access channel
  • the invention provides for a 5G NR system of the above-mentioned type, which comprises a number of local ra dio equipments that is at least equal to the number of synchro nisation signal blocks in said set, each local radio equipment having an antenna with a radio coverage area and being synchro nised with the other local radio equipments with respect to the OFDM frame structure,
  • system is configured to broadcast each syn chronisation signal block of said set by at least one local ra dio equipment within each repetition period
  • each local radio equipment is configured to broad cast only one synchronisation signal block of said set.
  • the invention thus uses 5G NR capabilities to enhance the covered geographical area by splitting up the standard 5G NR node into separate local radio equipments, which are only fed with one synchronisation signal block, each to be broadcast at a specific time. Each local radio equipment thus only uses a part of the available OFDM structure to broadcast its synchro nisation signal block.
  • an elongated coverage area is achieved that looks exactly like a 5G NR sys- tern from the user terminal point-of-view but has a substan tially larger coverage area, thereby reducing the amount of handovers for the user terminal.
  • the user terminal travels through the chain from one of the chain's ends to the other, it traverses the coverage areas of all local radio equipments of the system. From the user terminal point-of-view it looks like it is going in a circle around a 5G NR node. As such, the user terminals of the system do not have to be adapted to the new cell structure as all necessary modifications are located in the (roadside) system.
  • the inventive system Compared to the case where multiple 5G NR nodes are ar ranged in a chain-like manner, the inventive system has the ad vantage that fewer hard handovers have to be performed as long as the user terminal travels within the elongated cell.
  • the user terminal switches from the one coverage area to an other coverage area of two local radio equipments of the inven tive system, the highly reliable and especially fast beam switching capabilities of 5G NR are utilized such that hard handovers are avoided.
  • the system comprises a baseband unit connected to all local radio equipments of the system, wherein the base band unit is configured to manage the local radio equipments.
  • the baseband unit is an effective way to distribute the syn chronisation signal blocks to the individual local radio equip ments.
  • the baseband unit can further determine which OFDM radio resources are to be used on which local radio equipment if one or more user terminals are located in a coverage area of the system.
  • each synchronisation signal block of said set comprises the Primary Synchronisation Signal (PSS) , Secondary Synchronisation Signal (SSS) , and Physical Broadcast Channel (PBCH) of the 5G NR standard.
  • PSS Primary Synchronisation Signal
  • SSS Secondary Synchronisation Signal
  • PBCH Physical Broadcast Channel
  • the Primary Synchronisation Signals (PSS) and Secondary Synchronisation Signals (SSS) of each synchronisation signal block of the set are the same and the Physical Broadcast Channel (PBCH) is dif ferent in each synchronisation signal block of the set and com prises a beam index.
  • the Primary and Secondary Synchronisa tion Signals usually encode the physical cell ID, this can be used to broadcast the same physical cell ID over the whole cell.
  • the Physical Broadcast Channel in this case delivers, amongst others, the individual information regarding the local radio equipment, seen by the user terminal as a specific angu lar beam of a 5G NR system employing beamforming.
  • the inventive system Compared to a conventional circular 5G NR system employing multiple antennas with beamforming, the inventive system exhib its further advantages for user terminals within the (compound) coverage area of the cell.
  • the system is configured to, after two user terminals have responded to the system which synchronisation signal block they have received, allocate the same OFDM radio resources, for uplink and/or downlink, to both user terminals if they are located within coverage areas that are not adjacent to each other.
  • the overall throughput of the system can be enhanced, with respect to a classical 5G NR system employing beamforming, as OFDM radio resources can be "reused" for user terminals in non-adjacent local radio equip ments .
  • the system is configured to, after a user terminal has responded to the system that it is about to leave the coverage area of one local radio equip ment and is about to enter the coverage area of another local radio equipment, allocate the same OFDM radio resources, for uplink and/or downlink, on both of said local radio equipments for communication with the user terminal.
  • This can be used to employ diversity schemes such as MIMO (Multiple Input Multiple Output) or MISO (Multiple Input Single Output) , for example, as this reduces the needed signal-to-noise ratio and thus enhances the throughput .
  • MIMO Multiple Input Multiple Output
  • MISO Multiple Input Single Output
  • the system is configured to, after a user terminals has responded to the system that it is about to leave the coverage area of one local radio equip ment and is about to enter the coverage area of another local radio equipment, allocate OFDM radio resources for downlink on the local radio equipments that the user terminal is leaving and OFDM radio resources for uplink on the local radio equip ments that the user terminal is entering.
  • OFDM radio resources for downlink on the local radio equipments that the user terminal is leaving and OFDM radio resources for uplink on the local radio equip ments that the user terminal is entering.
  • user terminals only either communicate with local radio equipments that they move away from or towards to. This can be used to reduce the Doppler shift within the system as described above. This is based on the fact that the user terminal does not adjust its internal clock after receiving a Doppler shifted communication on the downlink channel.
  • the offset of the local clock of the user terminal is negated by the reversed relative velocity as seen by the respective local radio equipment.
  • the overall commu nication quality is improved in the system, making communica tions more stable.
  • the number of local radio equipments is equal to the number of synchronisation signal blocks in said set, and each local radio equipment is configured to broadcast a syn chronisation signal block of said set that is different to the synchronisation signal blocks broadcast by the other local ra dio equipments.
  • the number of local radio equipments is an integer-multiple of the number of synchronisation signal blocks, and the local radio equipments are arranged in a re- peating sequence of broadcasting the different synchronisation signal blocks.
  • each local radio equipment only has one antenna, which is an omni-directional antenna. This is pre ferred because the construction of the chain is made especially simple as omni-directional antennas are easy to acquire, pro gram and deploy in the field.
  • Fig. 1 shows a 5G NR system of the state of the art em ploying beamforming for eight antennas with narrow coverage ar eas in a schematic top view;
  • Fig. 2 shows the successive broadcasting of synchronisa tion signal blocks by the node of Fig. 1 in a time-signal dia gram
  • Fig. 3 shows an elongated cell according to the invention in a perspective view
  • Figs. 4 and 5 show the broadcasting of synchronisation signal blocks by two different local radio equipments of the system of Fig. 3 in a time-signal diagram each; and Fig. 6 shows an extended elongated cell according to the invention with a repeating sequence of broadcasting the differ ent synchronisation signal blocks in a perspective view.
  • Fig. 1 shows a 5G NR system 1 according to the state of the art having a node 2 with eight antennas 3i, ..., 3 S gener ally 3 n .
  • the node 2 communicates with a user terminal 5 by means of that antenna 3 n whose cover age area 4 n overlaps the user terminal 5.
  • user terminals 5 When user terminals 5 enter the "compound" coverage area created by the totality of the coverage areas 4 n of all anten nas 3 n of the node 2 for the first time, they need to receive and identify so-called synchronisation signals from the node 2 in order to have information about the OFDM structure of the communication channels used by a node 2. In order that the user terminal 5 knows in which coverage area 4 n it is located, the node 2 broadcasts synchronisation signal blocks 6 lf 6 2 , ... gen erally 6 n , successively in time t, each synchronisation signal block 6 n over a different antenna 3 n as shown in Fig. 2.
  • the duration of the set 7 of synchronisation sig nal blocks 6 n is 5 ms and the duration of the repetition period is 20 ms.
  • all antennas 3 n of the node 2 broadcast the same physical cell ID.
  • all synchronisation signal blocks 6 n contain the same physical cell ID but a different beam index n such that the user terminal 5 knows in which cov erage area 4 n it is located.
  • the node 2 peri odically sweeps through the coverage areas 4 n by successively broadcasting the synchronisation signal blocks 6 n in time t over different antennas 3 n such that it can be discovered by user terminals 5 at any angular direction to the node 2.
  • Fig. 3 shows a system 9 that is specifically adapted to be used for linear cellular networks.
  • user terminals 5 only travel in one direction d L or in the respective other direction d R .
  • the system 9 can be used with trains 10 carrying user terminals 5, wherein the directions d L , d R of travel are defined by a track 11.
  • Fur thermore the system 9 could be used along a highway, tunnel, or the like.
  • Several systems 9 can be placed next to each other to cover vast parts of the highway, tunnel, or the like as de scribed above.
  • the system 9 communicates with the user terminals 5 as de scribed above for the node 2 with reference to Figs. 1 and 2.
  • the system 9 communicates with the user terminals 5 according to a 5G NR standard having an OFDM structure in which a set of synchronisation signal blocks 6 n containing the same physical cell ID is repeatedly broadcast with a predetermined repetition period 8, the synchronisation signal blocks 6 n of said set 7 been broadcast successively in time t, each synchro nisation signal block 6 n of said set 7 over a different antenna 3n-
  • the number of synchronisation signal blocks 6 n within the set 7 is usually predetermined by the 5G NR standard, and is four synchronisation signal blocks 6 n within the repetition pe riod 8 if the system 9 uses uplink and downlink frequency bands below 3 GHz, eight synchronisation signal blocks 6 n within the repetition period 8 if the system 9 uses uplink and downlink frequency bands above 3 GHz and below 6 GHz, and so forth.
  • the system 9 usually adopts these limitations given by the stan dard, but with slight changes to the setup of the user termi nals 5, different numbers can be chosen, too.
  • the system 9 em ploys a different physical layout.
  • Each local radio equipment 12 m comprises its own antenna 3 n with radio coverage area 4 n , a support 13 on which the an tenna 3 n is mounted, and a transceiver 14.
  • the antennas 3 n are omni-directional antennas.
  • the antennas 3 n could also be directional anten nas, e.g., with elliptical or eight-shaped coverage areas.
  • more than one antenna 3 n can be employed to cover a left and a right side of the local radio equipment 12 m in the linear cellular network, for example.
  • the system 9 can also be oper ated on lower frequency bands, for example in the region of 900 MHz or between 3GHz and 6GHz so that instead of dedicated 5G antenna equipment, e.g., legacy 3G or 4G radio gear could be used for the local radio equipments 12 m and/or antennas 3 n .
  • dedicated 5G antenna equipment e.g., legacy 3G or 4G radio gear could be used for the local radio equipments 12 m and/or antennas 3 n .
  • the local radio equipments 12 m are spaced apart from each other by predetermined distances s, for example along said track 10.
  • the predetermined distances s can be constant or varying between the local radio equipments 12 m of the system 9.
  • the predetermined distance s can be at least 10 m, for example 100 - 500 m.
  • each local radio equipment 12 m has a coverage area 4 n that adjoins or overlaps exactly two coverage areas 4 n _i, 4 n+i of dif ferent local radio equipments 12 m _i, 12 m+i of the same system 9 (except for the two outermost local radio equipments 12i, 12 M ) .
  • This elongated radio cell 15 is especially suited for lin ear cellular networks as specified above. Many of these elon gated radio cells 15 can again be chained to each other, i.e., one outermost local radio equipment 12 m has its coverage area 4 n overlapping or adjoining the coverage area 4 n of an outer most local radio equipment 12 m of a different elongated cell 15. It can be seen that user terminals 5 have to perform a standard handover ("hard handover") when exiting one elongated cell 15 and entering another.
  • hard handover standard handover
  • All local radio equipments 12 m of one system 9 are managed by a common baseband unit 16.
  • the baseband unit 16 is connected to all local radio equipments 12 m of the same elongated cell 15 or system 9.
  • each local radio equipment 12 m only broadcasts one synchronisation signal block 6 n of said set 7.
  • the baseband unit 16 can feed the specific synchronisation signal block 6 n only to this local radio equipment 12 m that is going to broad cast this synchronisation signal block 6 n .
  • Figs. 4 and 5 show two time-signal diagrams of the first and the second local radio equipment 12i, 12 2 of Fig. 3. From Fig. 4 it can be seen that the first local radio equipment 12i only broadcasts the first synchronisation signal block 6i at a first instant in time ti, and repeatedly after the repetition period 8 described above. The second local radio equipment 12 2 of Fig. 3 only broadcasts the second synchronisation signal block 6 2 at a second instant in time t 2 , repeatedly after the repetition period 8, as shown in Fig. 5. In general, the m-th local radio equipment 12 m only broadcasts the synchronisation signal block 6 n at the instant in time t n , repeatedly with the repetition period 8.
  • the system 9 broadcasts each synchronisation signal block 6 n of said set 7 by at least one local radio equipment 12 m within each repetition period 8.
  • All local radio equipments 12 m are synchronized with each other with respect to the OFDM frame structure. This can be achieved by means of the common baseband units 16 or by means of a global timing, for example delivered by GPS.
  • the synchronisation signal blocks 6 n of said set 7 each comprise the Primary Synchronisation Signal (PSS) , Secondary Synchronisation Signal (SSS) , and Physical Broadcast Channel (PBCH) of the 5G NR standard.
  • PSS and SSS of each synchronisa tion signal block 6 n of the set 7 are the same and indicate the physical cell ID of the cell 15.
  • the PBCH of each synchronisa tion signal block 6 n is different and contains a beam index in dicative of the broadcasting local radio equipment 12 m of the cell 15, amongst others.
  • the chain structure of the elongated cell 15 can further be utilized to enhance the throughput by optimizing interfer ences for one or more user terminals 5 travelling through the elongated cell 15.
  • OFDM radio resources can be re-used.
  • the two user ter minals 5 will indicate to the system 9 that they are in such non-adjacent coverage areas 4 n of said local radio equipments 12 m .
  • the system 9, for example by means of the baseband unit 16 can allocate the same OFDM radio resources, for uplink and/or downlink, to both user terminals 5. Even though the same OFDM radio resource is used for two user terminals 5, there will be no interference because said local radio equipments 12 m are not adjacent.
  • a user terminal 5 will in dicate to the system 9 that it is about to leave the coverage area 4 n of one local radio equipment 12 m and is about to enter the coverage area 4 n+i of another local radio equipment 12 m+i .
  • the system 9, for example by means of the baseband unit 16, can then allocate the same OFDM radio resource for uplink and/or downlink, on both of said local radio equipments 12 m , 12 m+i .
  • This can be used for diversity schemes such as multiple input multiple output (MIMO) or multiple input single output (MISO) .
  • MIMO multiple input multiple output
  • MISO multiple input single output
  • the same information can be sent on the same OFDM radio resource twice but in different representations, one by each of the local radio equipments 12 m , 12 m+i .
  • the chain structure of the elongated cell 15 can be used to reduce the Doppler shift within the system 9.
  • the system 9 for example by means of the baseband unit 16, allocates OFDM radio resources for downlink on the local radio equipment 12 m that the user terminal is leaving and OFDM radio resources for uplink on the local radio equipment 12 m+i that the user terminal 5 is entering.
  • the Doppler shift experienced when receiving mes sages from the downlink communication can be utilized for com pensation when sending information to the local radio equipment 12 m+i in the travelling direction.
  • the number of local radio equipments 12 m is equal to the number of synchronisation signal blocks 6 n in said set 7.
  • each local radio equipment 12 m broadcasts a synchronisation signal block 6 n of said set 7 that is different to the synchronisation signal blocks broadcast by the other local radio equipments 12 m .
  • This means that each syn chronisation signal block 6 n is broadcast uniquely within the elongated cell 15.
  • Fig. 6 shows that the system 9 can also comprise a number of local radio equipments 12 m that is an integer-multiple of the number of synchronisation signal blocks 6 n . For example, there are 2, 3, 4, ... times more local radio equipments 12 m than synchronisation signal blocks 6 n to be broadcast. In this sys tem, multiple local radio equipments 12 m will broadcast the same synchronisation signal block 6 n at the same time t n . For the user terminal 5, this does not make a difference as it sim ply thinks that it has passed through the same 5G NR node mul tiple times. The system 9, however, remembers which specific local radio equipment 12 m has received uplink data from a user terminal 5 to also transmit downlink data to this user terminal 5 via the same local radio equipment 12 m . This management can be performed by the baseband unit 16, for example.

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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 système de communication avec un terminal d'utilisateur selon une norme de NR 5G ayant une structure d'OFDM dans laquelle des blocs de signal de synchronisation (6n) contenant le même identifiant de cellule physique sont diffusés de façon répétée, le système (9) comprenant un certain nombre d'équipements radio locaux (12m), les équipements radio locaux (12m) étant espacés les uns des autres par des distances prédéfinies (s), les zones de couverture (4n) des antennes (3n) étant alignés de manière contiguë selon une chaîne pour former une cellule radio allongée (15) avec ledit identifiant de cellule physique, le système (9) étant configuré pour diffuser chaque bloc de signal de synchronisation (6n) dudit ensemble (7) par au moins un équipement radio local (12m), à l'intérieur de chaque période de répétition (8), et chaque équipement radio local (12m) étant configuré pour diffuser uniquement un bloc de signal de synchronisation (6n) dudit ensemble (7).
PCT/EP2019/051362 2018-04-19 2019-01-21 Système de nr 5g pour communication avec un terminal d'utilisateur Ceased WO2019201484A1 (fr)

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EP18168208.9 2018-04-19
EP18168208 2018-04-19

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WO2019201484A1 true WO2019201484A1 (fr) 2019-10-24

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WO2025031193A1 (fr) * 2023-08-07 2025-02-13 中兴通讯股份有限公司 Procédé de test de maintenance de dispositif de communication, appareil de transmission de signal, dispositif électronique et support lisible

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CN114338314A (zh) * 2020-09-30 2022-04-12 中兴通讯股份有限公司 信号发送方法、频偏估计方法、通信网络系统、终端
EP4221108A4 (fr) * 2020-09-30 2024-03-27 ZTE Corporation Procédés d'estimation de décalages de fréquences et de transmission de signaux, système de réseau de communication, terminal, dispositif électronique et support lisible par ordinateur
WO2025031193A1 (fr) * 2023-08-07 2025-02-13 中兴通讯股份有限公司 Procédé de test de maintenance de dispositif de communication, appareil de transmission de signal, dispositif électronique et support lisible

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