WO2022002525A1 - Procédé et dispositif d'association de cellules dans un réseau non terrestre - Google Patents

Procédé et dispositif d'association de cellules dans un réseau non terrestre Download PDF

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Publication number
WO2022002525A1
WO2022002525A1 PCT/EP2021/064902 EP2021064902W WO2022002525A1 WO 2022002525 A1 WO2022002525 A1 WO 2022002525A1 EP 2021064902 W EP2021064902 W EP 2021064902W WO 2022002525 A1 WO2022002525 A1 WO 2022002525A1
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WO
WIPO (PCT)
Prior art keywords
signal
frequency
cell
wireless device
wireless network
Prior art date
Application number
PCT/EP2021/064902
Other languages
English (en)
Inventor
Torgny Palenius
Original Assignee
Sony Group Corporation
Sony Europe B.V.
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 Sony Group Corporation, Sony Europe B.V. filed Critical Sony Group Corporation
Publication of WO2022002525A1 publication Critical patent/WO2022002525A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18513—Transmission in a satellite or space-based system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
    • H04B7/18541—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection for handover of resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00837—Determination of triggering parameters for hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H04W36/083—Reselecting an access point wherein at least one of the access points is a moving node

Definitions

  • This disclosure relates to solutions for handling cell association of a wireless device in a wireless non-terrestrial network. Specifically, solutions are provided for decision-making in determination of providing a candidate cell for a wireless device, for association in either idle or connected mode of the wireless device.
  • wireless devices may act as mobile terminals for operation by radio communication with base stations, or access nodes, of a wireless network.
  • the wireless device is typically always associated with, or camped on, one base station, which may be referred to as a serving base station.
  • UE User Equipment
  • re-association When the wireless device is disconnected from the access network of the wireless network, such re-association is commonly referred to as cell reselection. This may be carried out by means of the wireless device receiving and assessing signals transmitted from various base stations and choosing a candidate cell to camp on for monitoring information or paging occasions from the wireless network. This is thus a mechanism to change cell after wireless device is camped on a cell and stay disconnected from the access network, such as in a Radio Resource Control (RRC) state Idle or Inactive.
  • RRC Radio Resource Control
  • the wireless device When the wireless device is connected to the access network of the wireless network, or acts to connect to the access network, such re-association is commonly referred to as a handover or handoff.
  • the wireless device may be configured to report measurement data obtained based on received base station signals, identifying one or more candidate cells, to the access network.
  • the wireless network controls the process and configures the wireless device to a new cell.
  • NR stands for New Radio, which denotes a radio access technology (RAT) developed by 3 GPP for the 5G (fifth generation) mobile network,
  • RAT radio access technology
  • a method which comprises: receiving a first signal associated with a first cell of the wireless network; determining a frequency value correlating with a receive frequency of the first signal; determining a second signal associated with a second cell of the wireless network; and determining a candidate cell, of the first cell and the second cell, for cell association based on at least said frequency value.
  • Fig. 1 illustrates a wireless network including a non-terrestrial access network, in which network the proposed solution may be carried out
  • Fig. 2 schematically illustrates functional elements of a wireless device configured to carry out the proposed solution
  • Fig. 3 schematically illustrates a signal associated with a cell in a non-terrestrial network usable by a wireless device for determining a candidate cell;
  • Fig. 4 schematically illustrates determination and identification of a candidate cell for reselection or handover, based on frequency of a cell signal
  • Fig. 5 shows a flow chart of method steps included in various embodiments described herein. Detailed description
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • a computer is generally understood to comprise one or more processors or one or more controllers, and the terms computer and processor and controller may be employed interchangeably herein.
  • processor or controller When provided by a computer or processor or controller, the functions may be provided by a single dedicated computer or processor or controller, by a single shared computer or processor or controller, or by a plurality of individual computers or processors or controllers, some of which may be shared or distributed.
  • processor or “controller” shall also be construed to refer to other hardware capable of performing such functions and/or executing software, such as the example hardware recited above.
  • FIG. 1 schematically illustrates a wireless communication system, providing an example of a scene in which the solutions provided herein may be incorporated.
  • the wireless communication system includes a wireless network 100, and a UE (or wireless device) 1 configured to wirelessly communicate with the wireless network 100.
  • the wireless network 100 comprises a core network 110, which is connected to other communication networks 150.
  • the wireless network 100 further comprises one or more access networks 120, 130, usable for communication with UEs of the system.
  • Such access networks may comprise a terrestrial network 120 comprising a plurality of access nodes or base stations 121, 122, configured to provide a wireless interface for inter alia the UE 1.
  • the base stations 121, 122 may be stationary or mobile.
  • the access network may further comprise a non-terrestrial network 130.
  • the non-terrestrial network 130 may comprise one or more satellites 141, 142, configured to transmit signals associated with a cell of the wireless network 100.
  • a ground station 140 of the non-terrestrial network 130 may be connected to the core network 110, and wirelessly connected to the satellites 141, 142.
  • the actual point of transmission and reception of each base station may be referred to as a Transmission and Reception Point (TRP).
  • TRP Transmission and Reception Point
  • the UE 1 may be any device operable to wirelessly communicate with the network 100 through the base stations 121, 122, 141, 142, such as a mobile telephone, computer, tablet, a M2M device or other.
  • the UE 1 can be configured to communicate in more than one beam, which are preferably orthogonal in terms of coding and/or frequency division and/or time division. Configuration of beams in the UE 1 may be realized by a spatial filter realized by using an antenna array configured to provide an anisotropic sensitivity profile to transmit radio signals in a particular transmit direction.
  • the UE 1 Before discussing various process solutions for the proposed method, the UE 1 will be functionally discussed.
  • Fig. 2 schematically illustrates an example of the UE 1 for use in a wireless network 100 as presented herein, and for carrying out the method steps as outlined.
  • the UE 1 may be an NR UE.
  • the UE 1 comprises a radio transceiver 213 for communicating with other entities of the radio communication network 100, such as the base stations 121, 122, 140, 141, in different frequency bands.
  • the transceiver 213 may thus include a radio receiver and transmitter for communicating through at least an air interface.
  • the UE 1 further comprises logic 210 configured to communicate data, via the radio transceiver, on a radio channel, to the wireless communication network 100 and possibly directly with another terminal by Device-to Device (D2D) communication.
  • D2D Device-to Device
  • the logic 210 may include a processing device 211, including one or multiple processors, microprocessors, data processors, co-processors, and/or some other type of component that interprets and/or executes instructions and/or data.
  • the processing device 211 may be implemented as hardware (e.g., a microprocessor, etc.) or a combination of hardware and software (e.g., a system-on-chip (SoC), an application- specific integrated circuit (ASIC), etc.).
  • SoC system-on-chip
  • ASIC application-specific integrated circuit
  • the processing device 211 may be configured to perform one or multiple operations based on an operating system and/or various applications or programs.
  • the logic 210 may further include memory storage 212, which may include one or multiple memories and/or one or multiple other types of storage mediums.
  • the memory storage 212 may include a random access memory (RAM), a dynamic random access memory (DRAM), a cache, a read only memory (ROM), a programmable read only memory (PROM), flash memory, and/or some other type of memory.
  • the memory storage 212 may include a hard disk (e.g., a magnetic disk, an optical disk, a magneto-optic disk, a solid state disk, etc.).
  • the memory storage 212 is configured for holding computer program code, which may be executed by the processing device 211, wherein the logic 210 is configured to control the UE 1 to carry out any of the method steps as provided herein.
  • Software defined by said computer program code may include an application or a program that provides a function and/or a process.
  • the software may include device firmware, an operating system (OS), or a variety of applications that may execute in the logic 210.
  • the UE 1 may further comprise an antenna system 214, which may include one or more antenna arrays.
  • the UE 1 is configured to operate with a single beam, wherein the antenna system 214 is configured to provide an isotropic sensitivity to transmit radio signals.
  • the antenna system 214 may comprise specific antenna elements for communication with terrestrial base stations 121, 122 and non terrestrial base stations 141, 142, respectively.
  • the UE 1 may include other features and elements than those shown in the drawing or described herein, such as a power supply, a casing, a user interface, sensors, etc., but are left out for the sake of simplicity.
  • SS- RSRP
  • SS- SS-
  • SINR Signal to Interference plus Noise Ratio
  • Fig. 3 schematically illustrates a signal SI transmitted towards the ground from a satellite TRP 141, which signal is associated with a cell of the non-terrestrial access network 130.
  • the signal SI may e.g. be a reference signal and/or form part of an SSB of a NR downlink signal transmission.
  • the satellite TRP 141 passes over the ground along an orbit 145.
  • the UE 1 is, in relation to the much higher speed of the satellite TRP 141, more or less stationary, even if it may be mobile. In other words, the UE 1 will thus first receive the signal SI as the TRP 141 is approaching, and after passing the closest point to the UE 1 the signal SI will be received from the TRP 141 as it moves away.
  • the signal SI is shown in a frequency diagram over time. More specifically, the curve reflects the receive frequency FI of the signal SI, as the signal SI is received at the UE 1.
  • the frequency curve of the received signal S 1 thus represents the doppler shift, where the time axis intersects the frequency axis at a nominal frequency fi of the signal SI, i.e. the transmitted signal frequency.
  • the doppler shift of the received signal SI is very high, and obviously varying when the satellite TRP 141 passes the UE 1.
  • the doppler shift is positive since the satellite is approaching, and when the satellite TRP 141 has passed it decreases and changes to a negative doppler shift.
  • the varying frequency can be used as a trigger for determining a candidate cell for the UE 1, for cell reselection or handover dependent on the state of the UE 1. This is illustrated by way of example in Fig. 4, and further described herein.
  • a method is provided which is carried out in the UE 1 for managing cell association in the non-terrestrial wireless network 130. The method comprises: receiving a first signal SI associated with a first cell 141 of the wireless network
  • a measurement scheme is obtained which makes use of a slower changing parameter with higher dynamics than the signal strength of the signal SI, which tends to drop and disappear much more rapidly as the satellite TRP 141 passes the horizon. This way, the UE 1 may be provided with a longer opportunity to locate and identify the second signal S2, from e.g. a next approaching satellite TRP 142, as a possible candidate cell.
  • the method comprises identifying the second cell, as provided by the second satellite TRP 142 and identified by the second signal S2, as the candidate cell.
  • Identifying the second cell as the candidate cell is in some examples based on a threshold criterion identifying that the receive frequency Fi of the first signal SI falls below a frequency level Th f . This determines that the satellite TRP 141 has passed and is moving away from the closest position to the UE 1, and that preparations shall be made for determining a new candidate cell to associate with.
  • the UE 1 is configured to determine the actual receive frequency Fi of the first signal SI, as the frequency value.
  • the threshold criterion may in such an example include comparing the determined receive frequency Fi with a frequency threshold and determining that the criterion is met responsive to the determined receive frequency Fi falling below the frequency threshold level.
  • the UE 1 is configured to determine a decrease in the determined receive frequency Fi of the first signal SI, as the frequency value.
  • the threshold criterion may in such an example include comparing the determined decrease with a frequency decrease threshold and determining that the criterion is met responsive to the determined decrease exceeding the frequency decrease threshold level.
  • the threshold criterion is determined based on the first nominal frequency fi associated with the first cell, which is the transmitted frequency of the first signal SI.
  • the decrease in the receive frequency Fi is caused by the doppler shift D ⁇ i of the first signal SI.
  • the UE 1 may initially camp on the cell associated with the first TRP 141, identified by the first signal SI.
  • the doppler shift turns from positive to negative.
  • the decrease in the receive frequency Fi of the first signal SI is such that the receive frequency falls below a frequency level Th f .
  • this point in time is identified where the doppler shift has already become negative.
  • the point in time ti may be identified when the magnitude of the doppler shift has decreased but not yet reached zero.
  • a second signal S2 usable for identification of the associated second cell and transmitted from the second satellite TRP 142 is transmitted on a second nominal frequency ⁇ 2 which is different from the first nominal frequency fi.
  • the second nominal frequency f ⁇ is the same the first nominal frequency fi.
  • the second signal S2 is received at a different pattern of time, frequency, or code than the first signal SI.
  • the UE 1 is configured to tune its wireless receiver of the transceiver 213 dependent on the determined doppler shift D ⁇ i of the first signal SI, to receive the second signal S2. This is schematically illustrated in Fig. 4, where the doppler shift D ⁇ i is identified at ti for the first signal SI. At that time, when the first satellite TRP 141 is moving away, the UE 1 may assume, or know by having knowledge of satellite trajectories, that the satellite TRP 142 transmitting the second signal S2 is approaching.
  • the receiver is in some examples tuned to a frequency corresponding to the second nominal frequency f2, associated with the second cell, plus a frequency amount corresponding to the absolute value of said doppler shift Afi. This may be the expected frequency F2 R to receive the second signal S2 at. For a broadband receiver, this may not be relevant, but in order to receive a strong signal and, in particular, in a narrowband receiver, tuning of the received dependent on the determined doppler shift Afi of the first signal SI may provide better reception capability to the UE 1.
  • the receiver of the UE 1 may, when the threshold criterion is met, be tuned to a frequency F2 R corresponding to the receive frequency fi of the first signal SI plus a frequency amount corresponding to twice the absolute value of said doppler shift Afi.
  • determining a candidate cell is in some examples further based on signal strength measurement of at least said first signal SI and said second signal S2. This may include determination of e.g. RSRP/RSRQ of the signals S 1 and S2.
  • signal strength/quality measurements may indicate that the first signal S 1 remains a better option than the second signal S2. Further iterated signal strength measurements may subsequently identify a time for association with the second cell as identified by the second signal S2, i.e. when both the threshold criterion and a signal strength/quality measurement criterion are met.
  • Fig. 5 shows a flow chart, schematically illustrating various steps of the proposed method. Different examples of the proposed solution may include all or only a subset of the shown steps.
  • the UE 1 is configured to receive the first signal S 1 associated with the first cell of the wireless network, as transmitted by a first satellite TRP 141.
  • the UE 1 is configured to determine a frequency value correlating with a receive frequency (Fi) of the first signal. As noted, this may include determining 503 the receive frequency Fi as such, and/or determining 504 the doppler shift Afi with regard to a first nominal frequency fi of the first signal SI.
  • the maximum Doppler shift for a LEO satellite is, according to TS38.821:
  • the free-running frequency reference in a UE is normally around 10 ppm, so therefore the doppler estimation is normally not very useful.
  • the UE frequency reference is relevant, especially since the UE 1 may be configured to estimate the relative frequency compared with last time it measured the receive frequency F2, and that relative accuracy is much better than lOppm.
  • the UE 1 may therefore be configured to repeatedly determine 505 a frequency of the received first signal S 1 and determine the frequency value of the first signal based on the repeatedly determined frequency.
  • the UE 1 is configured to determine the second signal S2 associated with the second cell of the wireless network, e.g. as transmitted by a second satellite TRP 142. Determining 506 the second signal may comprise identifying 507 the second signal based on known neighbor cells or known satellite trajectories, as a potential candidate cell after the first cell. Determining the second signal S2 may in some examples comprise receiving 509 the second signal S2, i.e. before any decision to change cell association is taken. The reception of the second signal S2 may thus be made before or after determining the frequency value correlating with the receive frequency Fi of the first signal SI.
  • the UE 1 may be configured to receive and identify both the first signal S 1 and the second signal S2 while being camped to the first cell associated with the first signal.
  • the step of receiving the determined second signal S2 may take place after it has been determined that a change of cell association is needed or suitable.
  • the step of determining the second signal S2 includes tuning
  • the UE 1 may be configured to receive 509 the second signal S2.
  • the UE 1 is configured to determine a candidate cell for cell association based on at least said frequency value. This may include assessing a threshold criterion identifying whether the receive frequency Fi of the first signal SI falls below a frequency level. In case the threshold criterion is not met, the UE 1 may decide to remain camped on the first cell in idle mode and return to make cell signal measurements on at least the first signal SI. When in connected mode, the UE 1 will remain camped to the first cell until the wireless network controls a handover of the UE 1.
  • the method may comprise changing 511 cell association to the second cell as the candidate cell.
  • this may comprise cell reselection 512 made by the UE 1.
  • the UE 1 may be configured to transmit 513 a cell measurement report to the network 100. This may comprise identification of at least the first signal SI and the second signal S2, and detected measurement data.
  • the measurement data may comprise signal strength or quality measurement data, e.g. RSRP/RSRQ, and potentially also frequency level data of the detected signals SI, S2.
  • the UE 1 will subsequently be configured to receive 514 a handover control signal based on the cell measurement report.
  • Some benefits with the proposed solution is that it provides an easy and convenient way to determine that the satellite coverage is soon disappearing, and the new cell is approaching. Power related measurements will be much more difficult to use for this purpose.
  • the doppler shifts can be used to set the received frequency when searching for the new satellites that are approaching.
  • the UE 1 could calculate when the coverage will disappear, and a new cell is approaching if it knows the trajectories of all satellites. However, the UE 1 then also needs to know its position and calculate the trajectories. This could be quite power consuming for UEs, especially IoT devices to calculate the positions and coverage of all satellites.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un dispositif sans fil (1), et un procédé mis en œuvre dans le dispositif sans fil, pour gérer l'association de cellules dans un réseau sans fil non terrestre (130). Le procédé comprend : la réception (500) d'un premier signal (S1) associé à une première cellule du réseau sans fil ; la détermination (502) d'une valeur de fréquence (F1, Δf1) en corrélation avec une fréquence de réception (F1) du premier signal ; la détermination (506) d'un second signal (S2) associé à une seconde cellule du réseau sans fil ; et la détermination (510) d'une cellule candidate pour une association de cellules sur la base d'au moins ladite valeur de fréquence.
PCT/EP2021/064902 2020-07-02 2021-06-03 Procédé et dispositif d'association de cellules dans un réseau non terrestre WO2022002525A1 (fr)

Applications Claiming Priority (2)

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SE2050831 2020-07-02
SE2050831-3 2020-07-02

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WO2022002525A1 true WO2022002525A1 (fr) 2022-01-06

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003036820A1 (fr) * 2001-10-25 2003-05-01 Qualcomm, Incorporated Aide pour identifier un faisceau dans un systeme satellite
WO2014019739A1 (fr) * 2012-08-03 2014-02-06 Telefonaktiebolaget L M Ericsson (Publ) Procédé et agencement de prise en charge de procédures de mobilité
US20170171792A1 (en) * 2015-12-09 2017-06-15 Telefonaktiebolaget L M Ericsson (Publ) Cell selection for airborne mobile cellular communications equipment
US20200204250A1 (en) * 2018-12-19 2020-06-25 Hughes Network Systems, Llc Systems for mitigating service interrupts in satellite systems

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003036820A1 (fr) * 2001-10-25 2003-05-01 Qualcomm, Incorporated Aide pour identifier un faisceau dans un systeme satellite
WO2014019739A1 (fr) * 2012-08-03 2014-02-06 Telefonaktiebolaget L M Ericsson (Publ) Procédé et agencement de prise en charge de procédures de mobilité
US20170171792A1 (en) * 2015-12-09 2017-06-15 Telefonaktiebolaget L M Ericsson (Publ) Cell selection for airborne mobile cellular communications equipment
US20200204250A1 (en) * 2018-12-19 2020-06-25 Hughes Network Systems, Llc Systems for mitigating service interrupts in satellite systems

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Solutions for NR to support non-terrestrial networks (NTN", TR 38.821
ZTE CORPORATION ET AL: "Consideration on the cell definition and NTN mobility", vol. RAN WG2, no. Spokane, USA; 20181112 - 20181116, 12 November 2018 (2018-11-12), XP051556610, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/Meetings%5F3GPP%5FSYNC/RAN2/Docs/R2%2D1817062%2Ezip> [retrieved on 20181112] *

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