WO2022252176A1 - Identification de surface intelligente reconfigurable - Google Patents

Identification de surface intelligente reconfigurable Download PDF

Info

Publication number
WO2022252176A1
WO2022252176A1 PCT/CN2021/098110 CN2021098110W WO2022252176A1 WO 2022252176 A1 WO2022252176 A1 WO 2022252176A1 CN 2021098110 W CN2021098110 W CN 2021098110W WO 2022252176 A1 WO2022252176 A1 WO 2022252176A1
Authority
WO
WIPO (PCT)
Prior art keywords
radio signals
received
ris
wireless device
sequence
Prior art date
Application number
PCT/CN2021/098110
Other languages
English (en)
Inventor
Huaisong Zhu
Ming Li
Zhan Zhang
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
Huaisong Zhu
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 Telefonaktiebolaget Lm Ericsson (Publ), Huaisong Zhu filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to PCT/CN2021/098110 priority Critical patent/WO2022252176A1/fr
Priority to EP21943542.7A priority patent/EP4348875A1/fr
Publication of WO2022252176A1 publication Critical patent/WO2022252176A1/fr

Links

Images

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
    • H04B7/155—Ground-based stations
    • H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/0273—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves using multipath or indirect path propagation signals in position determination
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06—Systems determining position data of a target
    • G01S13/46—Indirect determination of position data
    • G01S2013/462—Indirect determination of position data using multipath signals

Definitions

  • the present disclosure is related to the field of telecommunication, and in particular, to a reconfigurable intelligent surface, a wireless device, and methods for identifying radio signals therefrom.
  • the reconfigurable intelligent surface benefited from the breakthrough on the fabrication of programmable meta-material, has been speculated as one of the key enabling technologies for the future six generation (6G) wireless communication systems scaled up beyond Massive-MIMO to achieve smart radio environment.
  • the meta-material based RIS makes possible wideband antennas with compact size, such that large scale antennas can be easily deployed at both ends of the user equipments (UEs) and BSs, to achieve Massive-MIMO gains but with significant reduction in power consumption.
  • EM electromagnetic
  • the RIS can be deployed as reconfigurable transmitters, receivers, and passive reflecting arrays. Being reflecting arrays, the RIS is usually placed in between the BS and single-antenna receivers, and consists of a vast number of nearly passive, low-cost, and low energy consuming reflecting elements, each of which introduces a certain phase shift to the signals impinging on it. By reconfiguring the phase shifts of elements of RIS, the reflected signals can be added constructively at the desired receiver to enhance the received signal power or destructively at non-intended receivers to reduce the co-channel interference.
  • the reflecting RIS can be fabricated in very compact size with light weight, leading to easy installation of RIS in building facades, ceilings, moving trains, lamp poles, road signs, etc., as well as ready integration into existing communication systems with minor modifications on hardware.
  • RIS may be accompanied with problems, for example, in positioning, interference mitigation, cell selection, by introducing additional propagation paths between the BSs and the UEs.
  • a method at a reconfigurable intelligent surface (RIS) for facilitating a first wireless device in identifying radio signals from the RIS comprises: receiving, from a second wireless device, a sequence of radio signals; adjusting the received sequence of radio signals in the analog domain to enable the first wireless device to determine that the adjusted sequence of radio signals comes from the RIS; and transmitting, to the first wireless device, the adjusted sequence of radio signals.
  • RIS reconfigurable intelligent surface
  • the step of adjusting the received sequence of radio signals in the analog domain comprises at least one of: replacing at least one of the received radio signals with a zero-power signal; applying a phase shift to at least one of the received radio signals; and applying a frequency shift to at least one of the received radio signals.
  • the method before the step of adjusting the received sequence of radio signals in the analog domain, the method further comprises at least one of: pre-configuring a criterion for selecting one or more radio signals for adjustment; and receiving the criterion for selecting one or more radio signals for adjustment.
  • the method before the step of transmitting, to the first wireless device, the adjusted sequence of radio signals, the method further comprises: transmitting, to the first wireless device, the criterion for selecting one or more radio signals for adjustment.
  • the step of replacing at least one of the received radio signals with a zero-power signal comprises: determining at least one of the received radio signals according to the criterion; and replacing the at least one determined radio signal with a zero-power signal.
  • the step of applying phase shift to at least one of the received radio signals comprises: determining at least one of the received radio signals according to the criterion; and applying the phase shift to the at least one determined radio signal.
  • a signal-specific phase shift or a common phase shift is applied for each of the at least one determined radio signal.
  • the step of applying a frequency shift to at least one of the received radio signals comprises: determining at least one of the received radio signals according to the criterion; and applying the frequency shift to the at least one determined radio signal. In some embodiments, for each of the at least one determined radio signal, a signal-specific frequency shift or a common frequency shift is applied.
  • the step of adjusting the received sequence of radio signals in the analog domain further comprises: adjusting the received sequence of radio signals in the analog domain to enable the first wireless device to further determine one or more of: -geometry information of the RIS and/or the second wireless device; and -information about signal delay introduced by the RIS.
  • one of the first wireless device and the second wireless device is a User Equipment (UE)
  • the other of the first wireless device and the second wireless device is a Radio Access Network (RAN) node.
  • the criterion is received from the RAN node.
  • a reconfigurable intelligent surface comprises: a processor; a memory storing instructions which, when executed by the processor, cause the processor to perform any of the methods of the first aspect.
  • a method at a first wireless device for determining that a sequence of radio signals comes from a reconfigurable intelligent surface (RIS) comprises: receiving the sequence of radio signals; and determining that the sequence of radio signals comes from the RIS in response to determining that at least one of the received radio signals is adjusted at least partially based on a criterion for selecting one or more radio signals from the sequence of radio signals for adjustment.
  • RIS reconfigurable intelligent surface
  • the method further comprises: receiving a second sequence of radio signals; and determining that the second sequence of radio signals comes from a second wireless device in response to determining that none of the radio signals of the second sequence of radio signals is adjusted at least partially based on the criterion. In some embodiments, the method further comprises: receiving a third sequence of radio signals; and determining that the third sequence of radio signals comes from another RIS in response to determining that at least one of the radio signals of the third sequence of radio signals is adjusted at least partially based on another criterion.
  • the method further comprises at least one of: performing a first positioning procedure at least partially based on the sequence of radio signals and information related to the RIS; performing a second positioning procedure at least partially based on the second sequence of radio signals and information related to the second wireless device; and performing a third positioning procedure at least partially based on the third sequence of radio signals and information related to the other RIS.
  • the criterion and/or the other criterion are pre-configured or received from the second wireless device, the RIS, and/or the other RIS.
  • the step of determining that at least one of the received radio signals is adjusted at least partially based on the criterion comprises at least one of: determining that at least one of the received radio signals is replaced with a zero-power signal at least partially based on the criterion; determining that a phase shift is applied to at least one of the received radio signals at least partially based on the criterion; and determining that a frequency shift is applied to at least one of the received radio signals at least partially based on the criterion.
  • the step of determining that at least one of the received radio signals is replaced with a zero-power signal at least partially based on the criterion comprises: determining a pattern of missing signals in the received sequence of radio signals; comparing the pattern of missing signals with the criterion; and determining that at least one of the received radio signals is replaced with a zero-power signal in response to determining that the pattern of missing signals is matched with the criterion.
  • the step of determining that a phase shift is applied to at least one of the received radio signals at least partially based on the criterion comprises: determining a pattern of received signal power changing for the received sequence of radio signals; comparing the pattern of received signal power changing with the criterion; and determining that a phase shift is applied to at least one of the received radio signals in response to determining that the pattern of received signal power changing is matched with the criterion.
  • the step of determining that a frequency shift is applied to at least one of the received radio signals at least partially based on the criterion comprises: determining a pattern of received signal power changing at different frequencies for the received sequence of radio signals; comparing the pattern of received signal power changing at the different frequencies with the criterion; and determining that a frequency shift is applied to at least one of the received radio signals in response to determining that the pattern of received signal power changing at the different frequencies is matched with the criterion.
  • the method further comprises: further determining, from the received sequence of radio signals one or more of geometry information of the RIS and/or the second wireless device and information about signal delay introduced by the RIS at least partially based on the criterion.
  • the RIS is a Reconfigurable Intelligent Surface (RIS)
  • one of the first wireless device and the second wireless device is a User Equipment (UE)
  • the other of the first wireless device and the second wireless device is a Radio Access Network (RAN) node.
  • RIS Reconfigurable Intelligent Surface
  • UE User Equipment
  • RAN Radio Access Network
  • a first wireless device comprises: a processor; a memory storing instructions which, when executed by the processor, cause the processor to perform any of the methods of the third aspect.
  • a computer program comprising instructions.
  • the instructions when executed by at least one processor, cause the at least one processor to carry out the method of any of the first and third aspects.
  • a carrier containing the computer program of the fifth aspect is provided.
  • the carrier is one of an electronic signal, optical signal, radio signal, or computer readable storage medium.
  • a wireless telecommunications system comprises: a first wireless device of the fourth aspect; a second wireless device configured to transmit radio signals; and a reconfigurable intelligent surface (RIS) of the second aspect, which is configured to adjust and forward the radio signal to the first wireless device.
  • RIS reconfigurable intelligent surface
  • Fig. 1 is a diagram illustrating an exemplary wireless telecommunication network in which a method for identifying radio signals from a RIS according to an embodiment of the present disclosure is applicable.
  • Fig. 2 is a diagram illustrating an exemplary RIS at which a method for enabling identification of the RIS according to an embodiment of the present disclosure is applicable.
  • Fig. 3 is a diagram illustrating another exemplary RIS at which a method for enabling identification of the RIS according to an embodiment of the present disclosure is applicable.
  • Fig. 4 is a diagram illustrating an exemplary positioning procedure in which a method for enabling identification of the RIS according to an embodiment of the present disclosure is applicable.
  • Fig. 5 is a diagram illustrating a comparison between Rayleigh fading channels with and without RIS involved.
  • Fig. 6 is a diagram illustrating an exemplary wireless telecommunication network in which a method for identifying radio signals from one or more RISs according to an embodiment of the present disclosure is applicable.
  • Fig. 7 is diagram illustrating exemplary power delay profiles (PDP) in different situations when one or more RISs are used.
  • Fig. 8 is a diagram illustrating exemplary PDPs when a method for identifying radio signals from RISs is applied according to an embodiment of the present disclosure.
  • Fig. 9 is a diagram illustrating exemplary PDPs and simulated PDPs when another method for identifying radio signals from RISs is applied according to another embodiment of the present disclosure.
  • Fig. 10 is a diagram illustrating exemplary PDPs when yet another method for identifying radio signals from RISs is applied according to yet another embodiment of the present disclosure.
  • Fig. 11 is a diagram illustrating exemplary PDPs for positioning a UE according to an embodiment of the present disclosure.
  • Fig. 12 is a flow chart illustrating an exemplary method at a RIS for facilitating a first wireless device in identifying radio signals from the RIS according to an embodiment of the present disclosure.
  • Fig. 13 is a flow chart illustrating an exemplary method at a first wireless device for determining that a sequence of radio signals comes from a RIS according to an embodiment of the present disclosure.
  • Fig. 14 schematically shows an embodiment of an arrangement which may be used in a RIS according to an embodiment of the present disclosure.
  • Fig. 15 schematically shows an embodiment of an arrangement which may be used in a first wireless device according to an embodiment of the present disclosure.
  • Fig. 16 is a block diagram of an exemplary RIS according to an embodiment of the present disclosure.
  • Fig. 17 is a block diagram of an exemplary wireless device according to an embodiment of the present disclosure.
  • ′′exemplary′′ is used herein to mean ′′illustrative, ′′ or ′′serving as an example, ′′ and is not intended to imply that a particular embodiment is preferred over another or that a particular feature is essential.
  • the terms ′′first′′ and ′′second, ′′ and similar terms are used simply to distinguish one particular instance of an item or feature from another, and do not indicate a particular order or arrangement, unless the context clearly indicates otherwise.
  • the term ′′step, ′′ as used herein, is meant to be synonymous with ′′operation′′ or ′′action. ′′ Any description herein of a sequence of steps does not imply that these operations must be carried out in a particular order, or even that these operations are carried out in any order at all, unless the context or the details of the described operation clearly indicates otherwise.
  • the term ′′or′′ is used in its inclusive sense (and not in its exclusive sense) so that when used, for example, to connect a list of elements, the term ′′or′′ means one, some, or all of the elements in the list.
  • the term ′′each, ′′ as used herein, in addition to having its ordinary meaning, can mean any subset of a set of elements to which the term ′′each′′ is applied.
  • processing circuits may in some embodiments be embodied in one or more application-specific integrated circuits (ASICs) .
  • these processing circuits may comprise one or more microprocessors, microcontrollers, and/or digital signal processors programmed with appropriate software and/or firmware to carry out one or more of the operations described above, or variants thereof.
  • these processing circuits may comprise customized hardware to carry out one or more of the functions described above. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive.
  • 5G NR 5th Generation New Radio
  • the inventive concept of the present disclosure may be applicable to any appropriate communication architecture, for example, to Global System for Mobile Communications (GSM) /General Packet Radio Service (GPRS) , Enhanced Data Rates for GSM Evolution (EDGE) , Code Division Multiple Access (CDMA) , Wideband CDMA (WCDMA) , Time Division -Synchronous CDMA (TD-SCDMA) , CDMA2000, Worldwide Interoperability for Microwave Access (WiMAX) , Wireless Fidelity (Wi-Fi) , Long Term Evolution (LTE) , etc.
  • GSM Global System for Mobile Communications
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • CDMA Code Division Multiple Access
  • WCDMA Wideband CDMA
  • TD-SCDMA Time Division -Synchronous CDMA
  • CDMA2000 Code Division -Synchronous CDMA
  • WiMAX Worldwide Interoperability for Micro
  • the term ′′a wireless device′′ used herein may refer to a user equipment (UE) , a mobile device, a mobile terminal, a mobile station, a user device, a user terminal, a wireless terminal, an IoT device, a vehicle, a base station, a base transceiver station, an access point, a hot spot, a NodeB (NB) , an evolved NodeB (eNB) , a gNB, a network element, an access network (AN) node, or any other equivalents.
  • UE user equipment
  • a mobile device a mobile terminal, a mobile station, a user device, a user terminal, a wireless terminal, an IoT device, a vehicle, a base station, a base transceiver station, an access point, a hot spot, a NodeB (NB) , an evolved NodeB (eNB) , a gNB, a network element, an access network (AN) node, or any other equivalents.
  • Fig. 1 is a diagram illustrating an exemplary wireless telecommunication network 10 in which a method for identifying radio signals from a RIS 110 according to an embodiment of the present disclosure is applicable.
  • the network 10 may comprise a BS 100, a RIS 110, and a UE 120, and the BS 100 may communicate with the UE 120 via the RIS 110.
  • the present disclosure is not limited thereto.
  • multiple BS, multiple RISs, and/or multiple UEs may be comprised in the network 10.
  • the BS 100 is indirectly communicating with the UE 120 via the RIS 110, the BS 100 may communicate with the UE 120 directly simultaneously or alternatively.
  • the RIS 100 may be a node that receives a radio signal from a transmitter (e.g., the BS 100 or the UE 120) and then re-radiates the radio signal to a receiver (e.g., the UE 120 or the BS 100) with controllable time-delays (e.g., e j ⁇ n as shown in Fig. 1) .
  • the RIS 110 may consist of many small elements or particles 111 that can be assigned different time-delays and thereby synthesize the scattering behavior of an arbitrarily shaped object of the same size. This feature can, for instance, be used to beamform the radio signal towards the receiver, with cooperation between the BS 100 and the RIS 110 (e.g., its controller 115) , as shown in Fig. 1.
  • the RIS 110 may be a full-duplex transparent relay since the radio signals are processed in the analog domain and its surface may receive and re-transmit waves simultaneously. A very large surface area may then capture an unusually large fraction of the signal power and use the large aperture to re-radiate narrow beams to desired UEs.
  • a received signal at the UE 120 may be given by the following equation:
  • noise is a noise term
  • the RIS 110 may change the channel between the BS 100 and the UE 120 from the channel′s perspective. In other words, the RIS 110 may change the radio environment for the BS 100 and the UE 120.
  • RIS RNA resonator-like resonator-like resonator
  • a typical one is based on meta materials, which are referred to as meta-surface.
  • the architecture of an RIS is substantially different as compared with phased arrays or multiple-antenna systems. More specifically, a RIS may contain a largest number of scattering elements, but each of them may need to be formed by the fewest and least costly components.
  • active elements e.g., power amplifiers, are typically not necessary for operating a RIS.
  • a meta-surface based RIS may be very thin, and its thickness is much less than a wavelength of a radio signal.
  • a meta-surface is a sub-wavelength array formed by sub-wavelength metallic or dielectric scattering particles. It may be described as an electromagnetic discontinuity that is sub-wavelength in thickness, with typical values ranging from 1/10 to 1/5 of the wavelength and is electrically large in transverse size. Its unique properties lie in its capability of shaping the electromagnetic waves.
  • a radio signal incidents into the meta-surface may be reflected with a predefined phase offset, since a reflection coefficient of each scattering particle is changeable in real time.
  • Such a change may be achieved by electronic devices, for example, PIN diodes, MEMS switches.
  • Fig. 2 is a diagram illustrating an exemplary RIS 200 at which a method for enabling identification of the RIS according to an embodiment of the present disclosure is applicable.
  • the RIS 200 may comprise three layers: a meta-surface 230 for receiving and transmitting radio signals, a copper backplane 220 for shielding the electromagnetic waves, and a control circuit 210 for controlling the reflection amplitude and/or phase.
  • each of the reflecting elements 231 may have an equivalent circuit 232 in different states (e.g. on or off) . Although only two states are shown in Fig. 2, the present disclosure is not limited thereto. In some other embodiments, a different number of states may be provided by a reflecting element 231. For example, with a different circuit design (e.g., multiple PIN diodes) , a reflecting element 231 may be operated in four states, which enable a same received radio signal to be transmitted with four different phases in different states, respectively.
  • a different circuit design e.g., multiple PIN diodes
  • the RIS 200 may further comprise a RIS controller 215 for communicating with a BS (e.g., the BS 100 shown in Fig. 1) to receive instructions on how to change the amplitude and/or phase of the radio signals for each particle.
  • a BS e.g., the BS 100 shown in Fig. 1
  • Fig. 3 is a diagram illustrating another exemplary RIS 300 at which a method for enabling identification of the RIS according to an embodiment of the present disclosure is applicable.
  • the RIS 300 may be a passive reflect array, whose elements′antenna termination may be controlled electronically to backscatter and phase-shift incident signals. Each element may individually have a very limited effect on the propagated waves, but a sufficiently large number of elements may effectively manipulate the incident wave in a controllable manner. To be effective, this implementation may require a vastly large number of antenna elements, probably thousands.
  • Fig. 4 is a diagram illustrating an exemplary positioning procedure in which a method for enabling identification of the RIS according to an embodiment of the present disclosure is applicable.
  • a UE 400 when a UE 400 is being positioned through time-of-arrival (ToA) measurements, its position may be calculated in different ways. For example, in a real telecommunication network, calculating the position of the UE may be performed though the time-difference-of-arrival (TDOA) technology.
  • TDOA time-difference-of-arrival
  • the difference between the measured ToAs may be calculated which eliminates the UE signal arrival timing offset difference.
  • the resulting hyperbolas (e.g., those indicated by ToA 2 -ToA 1 and ToA 3 -ToA 1 in Fig. 4) may define possible locations of the UE 400 (e.g., the dotted curves in Fig. 4) and the intersection between all calculated hyperbolas may be determined as the actual location of the UE 400 (in absence of error sources) .
  • Fig. 4 shows a 2D scenario. At least four BSs are needed to calculate the 3D position of the UE 400 when these BSs are not located in a same plane.
  • the position errors do not depend on the distances between the UE 400 and the BSs 410, 420, and/or 430.
  • TDOA time difference algorithm
  • all the BSs used need to be well synchronized. This is a commonly used algorithm for range based indoor positioning.
  • RIS may be accompanied with problems, for example, in positioning, interference mitigation, cell selection, by introducing additional propagation paths between the BSs and the UEs.
  • a RIS may change channels to some level briefly, and a RIS has capabilities in shaping a MIMO channel to improve performance while at the same time simplifying precoding at the transmitter and equalization at the receiver.
  • RIS a MIMO channel between a transmitter and a receiver may be effectively orthogonalized and a near-unity condition number may be achieved. This greatly simplifies the processing at the transmitter and the receiver, shifting the complexity to the RIS controller optimization instead.
  • Fig. 5 is a diagram illustrating a comparison between Rayleigh fading channels with and without RIS involved. From the comparison, it can be clearly seen that a RIS may concentrate energy of a radio signal. The problem accompanied with the RIS is shown in Fig. 6.
  • Fig. 6 is a diagram illustrating an exemplary wireless telecommunication network 20 in which a method for identifying radio signals from one or more RISs 610, 615 according to an embodiment of the present disclosure is applicable.
  • NLOS non-line-of-sight
  • path #2 and the path #3 may be additional multi-paths introduced by the RIS #1 610 and the RIS #2 615, respectively.
  • the CIR (channel impulse response) difference among the three paths is relative delay difference.
  • the ideal power delay profile (PDP) for the three paths is shown in Fig. 7. For better demonstration, the distances among PDPs for the three paths are exaggerated.
  • the receiver e.g., the BS 600 or the UE 620
  • the receiver may get three samples, and based on PDP, the receiver may identify positioning related characteristics, relying on the path #2 and skipping the path #1 and the path #3.
  • the receiver may identify positioning related characteristics, relying on the path #2 and skipping the path #1 and the path #3.
  • a received signal at the receiver may be given by the following equation:
  • h2 is the gain of the path #2
  • g1 and h1 correspond to the path #1
  • g3 and h3 correspond to the path #3.
  • they have similar meanings to those in the equation (1) .
  • an ideal PDP for the three paths indicate that the three data samples have a roughly same amplitude or received signal power.
  • a different but practical situation may be observed, for example, as shown in (b) of Fig. 7.
  • the gain of the path #2 may be lower than those of the path #1 and the path #3, for example, when there is an obstacle between the BS 600 and the UE 620.
  • Stronger paths reflected by RIS may be good for data receiving from receiving combination′s point of view, and that is exactly the reason why RIS is attractive. However, it may cause a positioning solution (e.g., that shown in Fig. 4) less effective and accurate.
  • a RIS may concentrate energy to its receiver as described above, the beamforming gain may be significantly more than that of the LOS path sometimes, especially when there is an obstacle on the LOS path between the transmitter and the receiver.
  • a RIS may beamform an incident signal, bring a negative effect in positioning if a legacy positioning concept is used directly. Therefore, a method for identifying radio signals from RISs may be needed for use cases comprising but not limited to positioning, interference mitigation, cell selection, etc.
  • a method for identifying radio signals from a RIS may be proposed, such that no-RIS reflected signal and RIS reflected signal may be distinguished from each other. Further, radio signals reflected by different RISs may be identified as well.
  • a receiver may be aware the source of radio signals that are received via different paths (for example, which radio signal is a reflected signal coming from which RIS, or which radio signal is a radio signal received over-the-air without reflection) , and treat them differently for positioning.
  • path information may be utilized with help of RIS controller and some pre-measured information, which may comprise but not limited to: RIS and base station geometry information and/or RIS introduced delay information. With this assistance information, positioning accuracy can be further improved.
  • the RIS concept can still be kept the same while it may be transparent to the BS and the UE.
  • a RIS When a RIS reflects a radio signal, some additional information may be added to the reflected signal explicitly or implicitly, to make sure that a receiver can identify the additional information, while the signal, channel, and data themselves itself are not impacted.
  • a UE may have a zero or low moving speed, which brings head room to utilize the proposed methods.
  • a sequence of radio signals may be received by the RIS from the transmitter, and the received sequence of radio signals may be adjusted by the RIS in the analog domain to enable the receiver to determine that the adjusted sequence of radio signals comes from the RIS. Finally, the adjusted sequence of radio signals may be transmitted to the receiver.
  • the step of adjusting the received sequence of radio signals at the RIS in the analog domain may comprise at least one of:
  • Fig. 8 is a diagram illustrating exemplary PDPs when a method for identifying radio signals from RISs is applied according to an embodiment of the present disclosure.
  • Fig. 8 shows exemplary signal adjustment based on one or more on-off patterns for one or more RISs.
  • Such on-off patterns may be pre-configured at the receivers and the RISs, or negotiated dynamically between the receivers and the RISs.
  • a predetermined on-off pattern may be specified for each RIS and associated with a corresponding BS by the operator, such that any UE served by the BS may be aware of the patterns by a broadcasted system message or dedicated signaling received from the BS.
  • an on-off pattern of ′′on, off, on, off′′ is assigned to a RIS associated with the path #1, and another on-off pattern of ′′on, on, off, off′′ is assigned to another RIS associated with the path #3, such that the receiver may distinguish the three samples based on these on-off patterns. For example, for samples that are always on, the receiver may determine that these samples come from the BS directly since no RIS process is involved.
  • the receiver may determine that these samples come from the RIS associated with the path #1, while for samples that have a pattern of′′on, on, off, off′′ , the receiver may determine that these samples come from the RIS associated with the path #3.
  • on-off patterns with four time instances are shown in Fig. 8, the present disclosure is not limited thereto.
  • an on-off pattern with two, three, five or more time instances may be used in other embodiments.
  • the time intervals between different time instances may be varied as required.
  • the RISs may reflect radio signals in their ′′on′′ states (as shown in (a) of Fig. 8) for a much longer time than they reflect radio signals in their ′′off′′ states (as shown in (b) , (c) , and (d) of Fig. 8) , such that one or more missing samples via a certain path do not affect the signal decoding at the receiver.
  • the received signal at the receiver at the different time instances may be given by the following equations:
  • Fig. 9 is a diagram illustrating exemplary PDPs and simulated PDPs when another method for identifying radio signals from RISs is applied according to another embodiment of the present disclosure.
  • Fig. 9 shows exemplary signal adjustment based on one or more phase shifting patterns for one or more RISs.
  • phase shifting patterns may be pre-configured at the receivers and the RISs, or negotiated dynamically between the receivers and the RISs.
  • a predetermined phase shifting pattern may be specified for each RIS and associated with a corresponding BS by the operator, such that any UE served by the BS may be aware of the patterns by a broadcasted system message or dedicated signaling received from the BS.
  • a phase shifting pattern is assigned to both a RIS associated with the path #1 and another RIS associated with the path #3, such that both of the RISs may apply a phase shifting to their reflected radio signals at the same time instance.
  • the receiver will receive the reflected radio signals with a different power level at the time instance than those received at other time instances as shown in Fig. 9, because the directivity of the phase shifted, reflected signals will be changed from the original reflected signal. Therefore, the receiver may distinguish the three samples based on their phase shifting patterns. For example, for samples that always have a stable power level, the receiver may determine that these samples come from the BS directly since no RIS process is involved.
  • the receiver may determine that these samples come from a RIS.
  • Fig. 9 shows that the RISs associated with the path #1 and the path #3 have a same phase shifting pattern, the present disclosure is not limited thereto.
  • the receiver may determine that these samples come from the RIS associated with the path #1, while for samples that have a pattern of ′′high, high, low, low′′ , the receiver may determine that these samples come from the RIS associated with the path #3.
  • a simulated result for applying a phase shifting pattern at a RIS is shown.
  • the curve 910 indicates signals received via the LOS path while the curve 920 indicates signals received via the NLOS path (or RIS) . This can be determined from the different power levels at the same time instance (e.g., 2000 shown in the bottom half of Fig. 9) .
  • the received signal at the receiver when a phase shifting is applied at the RIS associated with the path #1 may be given by the following equation:
  • Fig. 10 is a diagram illustrating exemplary PDPs when yet another method for identifying radio signals from RISs is applied according to yet another embodiment of the present disclosure.
  • Fig. 10 shows exemplary signal adjustment based on one or more frequency shifting patterns for one or more RISs.
  • Such frequency shifting patterns may be pre-configured at the receivers and the RISs, or negotiated dynamically between the receivers and the RISs.
  • a predetermined frequency shifting pattern may be specified for each RIS and associated with a corresponding BS by the operator, such that any UE served by the BS may be aware of the patterns by a broadcasted system message or dedicated signaling received from the BS.
  • a diode switching frequency f d may be introduced.
  • the harmonics (1, 2, 3, ...) of f 1 may be added into the incident signal frequency.
  • PDPs may be calculated for different frequencies, f and f + f 1 , as shown by (a) and (b) of Fig. 10, respectively.
  • Most of energy of a radio signal received over the path #1 may be observed at the frequency f + f 1 . In other words, its frequency is shifted by diode switching of the RIS associated with the path #1.
  • the received signal at the receiver when a frequency shifting is applied at the RIS associated with the path #1 may be given by the following equation:
  • a same or different on-off pattern, a same or different phase shifting pattern, and/or a same or different frequency pattern may be used for identifying one or more RISs, separately or in any combination thereof.
  • another frequency shifting pattern may be applied by the RIS associated with the path #3, such that most of energy of a radio signal received over the path #3 may be observed at the frequency f + f 3 that is different from f and f + f 1 .
  • the RIS associated with the path #3 may be distinguished from the path #2 and the path #1 as well.
  • different phase shifting patterns may be applied by the RISs associated with the path #1 and the path #3, respectively, such that the RIS associated with the path #3 may be distinguished from the path #1 as well.
  • the on-off patterns for the path #1 and the path #3 may be same and is ′′on off′′ .
  • the receiver may easily identify the radio signals received via the LOS path #2, as shown in (d) of Fig. 8 and use the identified radio signals for positioning, for example, by using the LOS path based positioning.
  • a receiver may be aware the source of radio signals that are received via different paths (for example, which radio signal is a reflected signal coming from which RIS, or which radio signal is a radio signal received over-the-air without reflection) , and treat them differently for positioning.
  • Fig. 11 is a diagram illustrating exemplary PDPs for positioning a UE according to an embodiment of the present disclosure.
  • each of the multiple samples of a radio signal observed at the receiver may be distinguished one from another.
  • the receiver may determine that path #2 is a LOS path, and a legacy algorithm for positioning the UE may be used to identify UE signal arrival timing at the base station via air.
  • a RIS based positioning method may be used to estimate ToA of LOS path #2 between the BS and the UE.
  • a RIS in principle may provide more reflection information and this information may further improve positioning performance.
  • a BS may need some assistance information from a RIS controller and/or some pre-measured information, which may comprise but not limited to:
  • Fig. 12 is a flow chart of an exemplary method 1200 at a RIS for facilitating a first wireless device in identifying radio signals from the RIS according to an embodiment of the present disclosure.
  • the method 1200 may be performed at a RIS (e.g., any of the RISs 110, 200, 300, 610, 615) for facilitating a receiving wireless device in identifying the RIS.
  • the method 1200 may comprise steps S1210, S1220, and S1230.
  • the present disclosure is not limited thereto.
  • the method 1200 may comprise more steps, less steps, different steps, or any combination thereof. Further the steps of the method 1200 may be performed in a different order than that described herein.
  • a step in the method 1200 may be split into multiple sub-steps and performed by different entities, and/or multiple steps in the method 1200 may be combined into a single step.
  • the method 1200 may begin at step S1210 where a sequence of radio signals is received from a second wireless device.
  • the received sequence of radio signals is adjusted in the analog domain to enable the first wireless device to determine that the adjusted sequence of radio signals comes from the RIS.
  • the adjusted sequence of radio signals is transmitted to the first wireless device.
  • the step S1220 may comprise at least one of: replacing at least one of the received radio signals with a zero-power signal; applying a phase shift to at least one of the received radio signals; and applying a frequency shift to at least one of the received radio signals.
  • the method 1200 may further comprise at least one of: pre-configuring a criterion for selecting one or more radio signals for adjustment; and receiving the criterion for selecting one or more radio signals for adjustment.
  • the method 1200 before the step S1230, may further comprise: transmitting, to the first wireless device, the criterion for selecting one or more radio signals for adjustment.
  • the step of replacing at least one of the received radio signals with a zero-power signal may comprise: determining at least one of the received radio signals according to the criterion; and replacing the at least one determined radio signal with a zero-power signal.
  • the step of applying phase shift to at least one of the received radio signals may comprise: determining at least one of the received radio signals according to the criterion; and applying the phase shift to the at least one determined radio signal.
  • a signal-specific phase shift or a common phase shift may be applied for each of the at least one determined radio signal.
  • the step of applying a frequency shift to at least one of the received radio signals may comprise: determining at least one of the received radio signals according to the criterion; and applying the frequency shift to the at least one determined radio signal. In some embodiments, for each of the at least one determined radio signal, a signal-specific frequency shift or a common frequency shift may be applied.
  • the step S1220 may further comprise: adjusting the received sequence of radio signals in the analog domain to enable the first wireless device to further determine one or more of: -geometry information of the RIS and/or the second wireless device; and -information about signal delay introduced by the RIS.
  • one of the first wireless device and the second wireless device may be a User Equipment (UE)
  • the other of the first wireless device and the second wireless device may be a Radio Access Network (RAN) node.
  • the criterion may be received from the RAN node.
  • Fig. 13 is a flow chart of an exemplary method 1300 at a first wireless device for determining that a sequence of radio signals comes from a reconfigurable intelligent surface (RIS) according to an embodiment of the present disclosure.
  • the method 1300 may be performed at a BS (e.g., any of the BSs 100, 410, 420, 430, 600) or a UE (e.g., any of the UEs 120, 400, 620) for identifying one or more RISs.
  • the method 1300 may comprise steps S1310 and S1320. However, the present disclosure is not limited thereto. In some other embodiments, the method 1300 may comprise more steps, less steps, different steps, or any combination thereof.
  • steps of the method 1300 may be performed in a different order than that described herein. Further, in some embodiments, a step in the method 1300 may be split into multiple sub-steps and performed by different entities, and/or multiple steps in the method 1300 may be combined into a single step.
  • the method 1300 may begin at step S1310 where the sequence of radio signals is received.
  • step S1320 it is determined that the sequence of radio signals comes from the RIS in response to determining that at least one of the received radio signals is adjusted at least partially based on a criterion for selecting one or more radio signals from the sequence of radio signals for adjustment.
  • the method 1300 may further comprise: receiving a second sequence of radio signals; and determining that the second sequence of radio signals comes from a second wireless device in response to determining that none of the radio signals of the second sequence of radio signals is adjusted at least partially based on the criterion. In some embodiments, the method 1300 may further comprise: receiving a third sequence of radio signals; and determining that the third sequence of radio signals comes from another RIS in response to determining that at least one of the radio signals of the third sequence of radio signals is adjusted at least partially based on another criterion.
  • the method 1300 may further comprise at least one of: performing a first positioning procedure at least partially based on the sequence of radio signals and information related to the RIS; performing a second positioning procedure at least partially based on the second sequence of radio signals and information related to the second wireless device; and performing a third positioning procedure at least partially based on the third sequence of radio signals and information related to the other RIS.
  • the criterion and/or the other criterion may be pre-configured or received from the second wireless device, the RIS, and/or the other RIS.
  • the step of determining that at least one of the received radio signals is adjusted at least partially based on the criterion may comprise at least one of: determining that at least one of the received radio signals is replaced with a zero-power signal at least partially based on the criterion; determining that a phase shift is applied to at least one of the received radio signals at least partially based on the criterion; and determining that a frequency shift is applied to at least one of the received radio signals at least partially based on the criterion.
  • the step of determining that at least one of the received radio signals is replaced with a zero-power signal at least partially based on the criterion may comprise: determining a pattern of missing signals in the received sequence of radio signals; comparing the pattern of missing signals with the criterion; and determining that at least one of the received radio signals is replaced with a zero-power signal in response to determining that the pattern of missing signals is matched with the criterion.
  • the step of determining that a phase shift is applied to at least one of the received radio signals at least partially based on the criterion may comprise: determining a pattern of received signal power changing for the received sequence of radio signals; comparing the pattern of received signal power changing with the criterion; and determining that a phase shift is applied to at least one of the received radio signals in response to determining that the pattern of received signal power changing is matched with the criterion.
  • the step of determining that a frequency shift is applied to at least one of the received radio signals at least partially based on the criterion may comprise: determining a pattern of received signal power changing at different frequencies for the received sequence of radio signals; comparing the pattern of received signal power changing at the different frequencies with the criterion; and determining that a frequency shift is applied to at least one of the received radio signals in response to determining that the pattern of received signal power changing at the different frequencies is matched with the criterion.
  • the method 1300 may further comprise: further determining, from the received sequence of radio signals one or more of geometry information of the RIS and/or the second wireless device and information about signal delay introduced by the RIS at least partially based on the criterion.
  • one of the first wireless device and the second wireless device may be a User Equipment (UE)
  • the other of the first wireless device and the second wireless device may be a Radio Access Network (RAN) node.
  • UE User Equipment
  • RAN Radio Access Network
  • Fig. 14 schematically shows an embodiment of an arrangement which may be used in a RIS according to an embodiment of the present disclosure.
  • a processing unit 1406 e.g., with an application specific integrated circuit (ASIC) , a field programmable gate array (FPGA) , a Digital Signal Processor (DSP) , or a Central Processing Unit (CPU) .
  • the processing unit 1406 may be a single unit or a plurality of units to perform different actions of procedures described herein.
  • the arrangement 1400 may also comprise an input unit 1402 for receiving signals from other entities, and an output unit 1404 for providing signal (s) to other entities.
  • the input unit 1402 and the output unit 1404 may be arranged as an integrated entity or as separate entities.
  • the arrangement 1400 may comprise at least one computer program product 1408 in the form of a non-volatile or volatile memory, e.g., an Electrically Erasable Programmable Read-Only Memory (EEPROM) , a flash memory and/or a hard drive.
  • the computer program product 1408 comprises a computer program 1410, which comprises code/computer readable instructions, which when executed by the processing unit 1406 in the arrangement 1400 causes the arrangement 1400 and/or the remote UE and/or the relay UE in which it is comprised to perform the actions, e.g., of the procedure described earlier in conjunction with Fig. 7 through Fig. 12 or any other variant.
  • EEPROM Electrically Erasable Programmable Read-Only Memory
  • the computer program 1410 may be configured as a computer program code structured in computer program modules 1410A -1410C.
  • the code in the computer program of the arrangement 1400 includes: a module 1410A for receiving, from a second wireless device, a sequence of radio signals; a module 1410B for adjusting the received sequence of radio signals in the analog domain to enable the first wireless device to determine that the adjusted sequence of radio signals comes from the RIS; and a transmitting module 1410C for transmitting, to the first wireless device, the adjusted sequence of radio signals.
  • the computer program modules could essentially perform the actions of the flow illustrated in Fig. 7 through Fig. 12, to emulate the RIS.
  • the different computer program modules when executed in the processing unit 1406, they may correspond to different modules in the RIS.
  • code means in the embodiments disclosed above in conjunction with Fig. 14 are implemented as computer program modules which when executed in the processing unit causes the arrangement to perform the actions described above in conjunction with the figures mentioned above, at least one of the code means may in alternative embodiments be implemented at least partly as hardware circuits.
  • the processor may be a single CPU (Central processing unit) , but could also comprise two or more processing units.
  • the processor may include general purpose microprocessors; instruction set processors and/or related chips sets and/or special purpose microprocessors such as Application Specific Integrated Circuit (ASICs) .
  • the processor may also comprise board memory for caching purposes.
  • the computer program may be carried by a computer program product connected to the processor.
  • the computer program product may comprise a computer readable medium on which the computer program is stored.
  • the computer program product may be a flash memory, a Random-access memory (RAM) , a Read-Only Memory (ROM) , or an EEPROM, and the computer program modules described above could in alternative embodiments be distributed on different computer program products in the form of memories within the RIS.
  • RAM Random-access memory
  • ROM Read-Only Memory
  • EEPROM Electrically Erasable programmable read-only memory
  • Fig. 15 schematically shows an embodiment of an arrangement which may be used in a wireless device according to an embodiment of the present disclosure.
  • a processing unit 1506 e.g., with an application specific integrated circuit (ASIC) , a field programmable gate array (FPGA) , a Digital Signal Processor (DSP) , or a Central Processing Unit (CPU) .
  • the processing unit 1506 may be a single unit or a plurality of units to perform different actions of procedures described herein.
  • the arrangement 1500 may also comprise an input unit 1502 for receiving signals from other entities, and an output unit 1504 for providing signal (s) to other entities.
  • the input unit 1502 and the output unit 1504 may be arranged as an integrated entity or as separate entities.
  • the arrangement 1500 may comprise at least one computer program product 1508 in the form of a non-volatile or volatile memory, e.g., an Electrically Erasable Programmable Read-Only Memory (EEPROM) , a flash memory and/or a hard drive.
  • the computer program product 1508 comprises a computer program 1510, which comprises code/computer readable instructions, which when executed by the processing unit 1506 in the arrangement 1500 causes the arrangement 1500 and/or the remote UE and/or the relay UE in which it is comprised to perform the actions, e.g., of the procedure described earlier in conjunction with Fig. 7 through Fig. 11 and Fig. 13 or any other variant.
  • EEPROM Electrically Erasable Programmable Read-Only Memory
  • the computer program 1510 may be configured as a computer program code structured in computer program modules 1510A -1510B.
  • the code in the computer program of the arrangement 1500 includes: a module 1510A for receiving the sequence of radio signals; and a module 1510B for determining that the sequence of radio signals comes from the RIS in response to determining that at least one of the received radio signals is adjusted at least partially based on a criterion for selecting one or more radio signals from the sequence of radio signals for adjustment.
  • the computer program modules could essentially perform the actions of the flow illustrated in Fig. 7 through Fig. 11 and Fig. 13, to emulate the wireless device.
  • the different computer program modules when executed in the processing unit 1506, they may correspond to different modules in the wireless device.
  • code means in the embodiments disclosed above in conjunction with Fig. 15 are implemented as computer program modules which when executed in the processing unit causes the arrangement to perform the actions described above in conjunction with the figures mentioned above, at least one of the code means may in alternative embodiments be implemented at least partly as hardware circuits.
  • the processor may be a single CPU (Central processing unit) , but could also comprise two or more processing units.
  • the processor may include general purpose microprocessors; instruction set processors and/or related chips sets and/or special purpose microprocessors such as Application Specific Integrated Circuit (ASICs) .
  • the processor may also comprise board memory for caching purposes.
  • the computer program may be carried by a computer program product connected to the processor.
  • the computer program product may comprise a computer readable medium on which the computer program is stored.
  • the computer program product may be a flash memory, a Random-access memory (RAM) , a Read-Only Memory (ROM) , or an EEPROM, and the computer program modules described above could in alternative embodiments be distributed on different computer program products in the form of memories within the wireless device.
  • RAM Random-access memory
  • ROM Read-Only Memory
  • EEPROM Electrically Erasable programmable read-only memory
  • Fig. 16 is a block diagram of a RIS 1600 according to an embodiment of the present disclosure.
  • the RIS 1600 may be, e.g., any of the RISs 110, 200, 300, 610, 615 in some embodiments.
  • the RIS 1600 may be configured to perform the method 1200 as described above in connection with Fig. 12.
  • the RIS 1600 may comprise a receiving module 1610 for receiving, from a second wireless device, a sequence of radio signals; an adjusting module 1620 for adjusting the received sequence of radio signals in the analog domain to enable the first wireless device to determine that the adjusted sequence of radio signals comes from the RIS; and a transmitting module 1630 for transmitting, to the first wireless device, the adjusted sequence of radio signals.
  • the above modules 1610, 1620, and/or 1630 may be implemented as a pure hardware solution or as a combination of software and hardware, e.g., by one or more of: a processor or a micro-processor and adequate software and memory for storing of the software, a Programmable Logic Device (PLD) or other electronic component (s) or processing circuitry configured to perform the actions described above, and illustrated, e.g., in Fig. 12.
  • the RIS 1600 may comprise one or more further modules, each of which may perform any of the steps of the method 1200 described with reference to Fig. 12.
  • Fig. 17 is a block diagram of a wireless device 1700 according to an embodiment of the present disclosure.
  • the wireless device 1700 may be, e.g., a BS (e.g., any of the BSs 100, 410, 420, 430, 600) or a UE (e.g., any of the UEs 120, 400, 620) in some embodiments.
  • a BS e.g., any of the BSs 100, 410, 420, 430, 600
  • a UE e.g., any of the UEs 120, 400, 620
  • the wireless device 1700 may be configured to perform the method 1300 as described above in connection with Fig. 13. As shown in Fig. 17, the wireless device 1700 may comprise a receiving module 1710 for receiving the sequence of radio signals; and a determining module 1720 for determining that the sequence of radio signals comes from the RIS in response to determining that at least one of the received radio signals is adjusted at least partially based on a criterion for selecting one or more radio signals from the sequence of radio signals for adjustment.
  • the above modules 1710 and/or 1720 may be implemented as a pure hardware solution or as a combination of software and hardware, e.g., by one or more of: a processor or a micro-processor and adequate software and memory for storing of the software, a Programmable Logic Device (PLD) or other electronic component (s) or processing circuitry configured to perform the actions described above, and illustrated, e.g., in Fig. 13.
  • the wireless device 1700 may comprise one or more further modules, each of which may perform any of the steps of the method 1300 described with reference to Fig. 13.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne une surface intelligente reconfigurable (RIS), un dispositif sans fil et des procédés d'identification de signaux radio provenant de celle-ci. Le procédé au niveau d'une RIS pour faciliter l'identification, par un premier dispositif sans fil, de signaux radio provenant de la RIS consiste à : recevoir, en provenance d'un second dispositif sans fil, une séquence de signaux radio; régler la séquence reçue de signaux radio dans le domaine analogique pour permettre au premier dispositif sans fil de déterminer que la séquence réglée de signaux radio provient de la RIS; et transmettre au premier dispositif sans fil la séquence réglée de signaux radio.
PCT/CN2021/098110 2021-06-03 2021-06-03 Identification de surface intelligente reconfigurable WO2022252176A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2021/098110 WO2022252176A1 (fr) 2021-06-03 2021-06-03 Identification de surface intelligente reconfigurable
EP21943542.7A EP4348875A1 (fr) 2021-06-03 2021-06-03 Identification de surface intelligente reconfigurable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2021/098110 WO2022252176A1 (fr) 2021-06-03 2021-06-03 Identification de surface intelligente reconfigurable

Publications (1)

Publication Number Publication Date
WO2022252176A1 true WO2022252176A1 (fr) 2022-12-08

Family

ID=84322704

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2021/098110 WO2022252176A1 (fr) 2021-06-03 2021-06-03 Identification de surface intelligente reconfigurable

Country Status (2)

Country Link
EP (1) EP4348875A1 (fr)
WO (1) WO2022252176A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110830097A (zh) * 2019-11-05 2020-02-21 西南交通大学 一种基于反射面的主被动互惠共生传输通信系统
WO2020096506A1 (fr) * 2018-11-09 2020-05-14 Telefonaktiebolaget Lm Ericsson (Publ) Utilisation de miroirs comme solution de positionnement
CN112910807A (zh) * 2021-02-04 2021-06-04 华中科技大学 一种基于空间随机采样的智能超表面信道估计方法及系统

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020096506A1 (fr) * 2018-11-09 2020-05-14 Telefonaktiebolaget Lm Ericsson (Publ) Utilisation de miroirs comme solution de positionnement
CN110830097A (zh) * 2019-11-05 2020-02-21 西南交通大学 一种基于反射面的主被动互惠共生传输通信系统
CN112910807A (zh) * 2021-02-04 2021-06-04 华中科技大学 一种基于空间随机采样的智能超表面信道估计方法及系统

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WYMEERSCH HENK; HE JIGUANG; DENIS BENOIT; CLEMENTE ANTONIO; JUNTTI MARKKU: "Radio Localization and Mapping With Reconfigurable Intelligent Surfaces: Challenges, Opportunities, and Research Directions", IEEE VEHICULAR TECHNOLOGY MAGAZINE, IEEE,, US, vol. 15, no. 4, 7 October 2020 (2020-10-07), US , pages 52 - 61, XP011821427, ISSN: 1556-6072, DOI: 10.1109/MVT.2020.3023682 *

Also Published As

Publication number Publication date
EP4348875A1 (fr) 2024-04-10

Similar Documents

Publication Publication Date Title
EP3381133B1 (fr) Configuration de système d'antenne
KR101848079B1 (ko) 안테나 빔 반사장치 및 방법
KR20230045455A (ko) 무선 통신 시스템에서 지능형 반사 평면을 기반한 데이터 통신을 위한 장치 및 방법
WO2014154293A1 (fr) Estimation de canal dans les communications sans fil
WO2018063549A1 (fr) Apprentissage de formation de faisceau à l'aide d'échos d'une impulsion omnidirectionnelle
Wymeersch et al. 6G radio requirements to support integrated communication, localization, and sensing
WO2021252858A1 (fr) Surfaces intelligentes reconfigurables assistées par relais
Alexandropoulos et al. Smart wireless environments enabled by RISs: Deployment scenarios and two key challenges
CN115278526A (zh) 终端定位方法、装置、电子设备及存储介质
Zhou et al. Generalised three‐dimensional scattering channel model and its effects on compact multiple‐input and multiple‐output antenna receiving systems
Peng et al. Fast beam searching concept for indoor terahertz communications
Kadur et al. Experimental validation of robust beam tracking in a nlos indoor environment
WO2023207659A1 (fr) Procédé et dispositif de détermination de doa, support de stockage et dispositif électronique
WO2022252176A1 (fr) Identification de surface intelligente reconfigurable
WO2016209133A1 (fr) Procédé et dispositif de communication sans fil
Zhou et al. Asymmetric geometrical‐based statistical channel model and its multiple‐input and multiple‐output capacity
Tapio et al. Reconfigurable intelligent surface for 5G NR uplink coverage enhancement
Mahfoudi et al. Joint range extension and localization for low‐power wide‐area network
Lazarev et al. Beamforming and spatial multiplexing performance evaluation in 5G ultra-dense networks
CN115499851A (zh) 通信方法、装置、电子设备、介质及程序产品
Raeisi et al. Plug-in RIS: A novel approach to fully passive reconfigurable intelligent surfaces
Amin et al. Advanced channel prediction concepts for 5G radio systems
WO2022199818A1 (fr) Appareil et procédé de configuration de surface réfléchissante intelligente
Qian et al. * 5G Millimeter‐wave Communication Channel and Technology Overview
US11968010B2 (en) Systems and methods for beamforming of broadcast and synchronization channels

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: 21943542

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2021943542

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2021943542

Country of ref document: EP

Effective date: 20240103