EP4026258A1 - Transmission formée en faisceau vers un dispositif émetteur-récepteur radio - Google Patents

Transmission formée en faisceau vers un dispositif émetteur-récepteur radio

Info

Publication number
EP4026258A1
EP4026258A1 EP19765234.0A EP19765234A EP4026258A1 EP 4026258 A1 EP4026258 A1 EP 4026258A1 EP 19765234 A EP19765234 A EP 19765234A EP 4026258 A1 EP4026258 A1 EP 4026258A1
Authority
EP
European Patent Office
Prior art keywords
radio transceiver
transceiver device
phase difference
precoder
panels
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19765234.0A
Other languages
German (de)
English (en)
Inventor
Magnus Thurfjell
Anders Landström
Arne Simonsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of EP4026258A1 publication Critical patent/EP4026258A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0691—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/10—Polarisation diversity; Directional diversity

Definitions

  • Embodiments presented herein relate to a method, a radio transceiver device, a computer program, and a computer program product for beamformed transmission towards another radio transceiver device.
  • communications networks there may be a challenge to obtain good performance and capacity for a given communications protocol, its parameters and the physical environment in which the communications network is deployed.
  • one parameter in providing good performance and capacity for a given communications protocol in a communications network is the ability to perform beamformed transmission.
  • different types of precoding might be performed.
  • precoding is a generalization of beamforming to support multi-stream (or multi-layer) transmission in multi-antenna wireless communications.
  • CSI-RS Channel State Information Reference Signals
  • terminal devices such as UEs
  • CSI-RS Channel State Information Reference Signals
  • These antenna ports might be mapped to different parts of the antenna array of the radio access network node and consists only of a subset of the total number of antenna elements of the antenna array.
  • the antenna elements within each port are weighted to shape a beam defining the CSI-RS coverage. This beam shape might be the same for all CSI-RS ports.
  • Each terminal device listens to the set of CSI-RSs and therefrom determines rank and a suitable precoder for the radio access network node to apply for data transmission towards this terminal device.
  • the precoder is made up of complex weights applied to the antenna ports.
  • a grid-of-beam search is used where an initial beam search is performed to direct the beams of the individual CSI-RS ports in a preferred direction towards the terminal devices.
  • the beams used for the CSI-RS ports are fixed and typically wide enough to cover the cell.
  • the rank and precoding is by the radio access network node determined by listening to uplink transmission of reference signals, such as Sounding Reference Symbols (SRS), from the terminal devices.
  • SRS Sounding Reference Symbols
  • the performance of reciprocity based precoding is expected be degraded in areas with low channel quality.
  • an alternative is to instead use closed loop precoding.
  • closed loop precoding the resulting weights on all the antenna elements is a combination of the weights used for forming the individual CSI-RS port beams and the precoding weights applied to the set of ports. This is generally not optimal, especially at low ranks where a distinct high gain beam towards the terminal device is preferred.
  • An object of embodiments herein is to provide efficient precoder selection.
  • the object is achieved by a method for beamformed transmission.
  • a method for beamformed transmission towards a second radio transceiver device is performed by a first radio transceiver device.
  • the first radio transceiver device comprises an antenna array divided into at least two panels.
  • the method comprises obtaining an indication of which precoder has been reported by the second radio transceiver device.
  • the precoder corresponds to a phase difference P between the panels.
  • the method comprises mapping the phase difference P to a set of at least one phase difference p(n), n being a positive integer, between individual antenna elements within each panel.
  • the method comprises selecting one phase difference p(n*) from the set of at least one phase difference p(n) in the set based on an estimated direction towards the second radio transceiver device, where n* is the selected positive integer.
  • the method comprises applying the precoder on the panels for beamformed transmission towards the second radio transceiver device whilst applying the selected phase difference p(n*) between the individual antenna elements within each panel.
  • the object is achieved by a radio transceiver device for beamformed transmission.
  • a radio transceiver device for beamformed transmission towards a second radio transceiver device.
  • the radio transceiver device comprises an antenna array divided into at least two panels.
  • the radio transceiver device further comprises processing circuitry.
  • the processing circuitry is configured to cause the radio transceiver device to obtain an indication of which precoder has been reported by the second radio transceiver device.
  • the precoder corresponds to a phase difference P between the panels.
  • the processing circuitry is configured to cause the radio transceiver device to map the phase difference P to a set of at least one phase difference p(n), n being a positive integer, between individual antenna elements within each panel.
  • the processing circuitry is configured to cause the radio transceiver device to select one phase difference p(n*) from the set of at least one phase difference p(n) in the set based on an estimated direction towards the second radio transceiver device, where n* is the selected positive integer.
  • the processing circuitry is configured to cause the radio transceiver device to apply the precoder on the panels for beamformed transmission towards the second radio transceiver device whilst applying the selected phase difference p(n*) between the individual antenna elements within each panel.
  • a radio transceiver device for beamformed transmission towards a second radio transceiver device.
  • the radio transceiver device comprises an antenna array divided into at least two panels.
  • the radio transceiver device further comprises an obtain module configured to obtain an indication of which precoder has been reported by the second radio transceiver device.
  • the precoder corresponds to a phase difference P between the panels.
  • the radio transceiver device further comprises a map module configured to map the phase difference P to a set of at least one phase difference p(n), n being a positive integer, between individual antenna elements within each panel.
  • the radio transceiver device further comprises a select module configured to select one phase difference p(n*) from the set of at least one phase difference p(n) in the set based on an estimated direction towards the second radio transceiver device, where n* is the selected positive integer.
  • the radio transceiver device further comprises an apply module configured to apply the precoder on the panels for beamformed transmission towards the second radio transceiver device whilst applying the selected phase difference p(n*) between the individual antenna elements within each panel.
  • this provides efficient precoder selection whilst enabling higher signal strength, better coverage, less interference, and use of lower transmitted power, than if traditional precoding is used.
  • a computer program for beamformed transmission towards a second radio transceiver device comprising computer program code which, when run on a radio transceiver device configured according to the second aspect or the third aspect, causes the radio transceiver device to perform a method according to the first aspect.
  • a computer program product comprising a computer program according to the fourth aspect and a computer readable storage medium on which the computer program is stored.
  • the computer readable storage medium could be a non- transitory computer readable storage medium.
  • FIG. 1 is a schematic diagram illustrating a communication network according to embodiments
  • Fig. 2 is a flowchart of methods according to embodiments
  • Fig. 3 is a schematic diagram illustrating part of the communication network in Fig. 1 according to an embodiment
  • Fig. 4 is a schematic diagram showing functional units of a radio transceiver device according to an embodiment
  • Fig. 5 is a schematic diagram showing functional modules of a radio transceiver device according to an embodiment
  • Fig. 6 shows one example of a computer program product comprising computer readable storage medium according to an embodiment
  • Fig. 7 is a schematic diagram illustrating a telecommunication network connected via an intermediate network to a host computer in accordance with some embodiments.
  • Fig. 8 is a schematic diagram illustrating host computer communicating via a radio base station with a terminal device over a partially wireless connection in accordance with some embodiments.
  • Fig. 1 is a schematic diagram illustrating a communication network 100a where embodiments presented herein can be applied.
  • the communication network 100a comprises a radio access network node 140 provided in a radio access network 110.
  • the radio access network 110 is in turn operatively connected to a core network 120 which in turn is connected to a service network 130, such as the Internet.
  • the radio access network node 140 is configured to provide network access to terminal device 150.
  • the terminal device 150 is thus enabled to access services of, and exchange data with, the service network 130.
  • the radio access network node 140 comprises a radio transceiver device 200a and the terminal device 150 comprises a radio transceiver device 200b.
  • the radio transceiver device 200a is, is part of, is integrated with, or collocated with, the radio access network node 140.
  • radio access network nodes are radio base stations, base transceiver stations; node Bs (NBs), evolved node Bs (eNBs), gNBs, and access points.
  • NBs node Bs
  • eNBs evolved node Bs
  • gNBs node Bs
  • the radio transceiver device 200b is, is part of, is integrated with, or collocated with, the terminal device 150.
  • Non-limiting examples of terminal devices are portable wireless devices, mobile stations, mobile phones, handsets, wireless local loop phones, user equipment (UE), smartphones, laptop computers, tablet computers, network equipped vehicles and network equipped sensors.
  • radio transceiver device 200a will hereinafter be referred to as a first radio transceiver device whilst radio transceiver device 200b hereinafter will be referred to as a second radio transceiver device.
  • first radio transceiver device will hereinafter be referred to as a first radio transceiver device
  • second radio transceiver device will be referred to as a second radio transceiver device.
  • this does not necessarily imply any hierarchical relation or relationship between these radio transceiver devices.
  • this directional information can be used when modifying the weights for the beams to be used for data transmission of those antenna elements that are within each CSI-RS port at the first radio transceiver device 200a so when used for data transmission the individual panels are also directed towards the second radio transceiver device 200b, where the second radio transceiver device 200b is the intended receiver.
  • the complete antenna array will thereby be optimized for transmission in the preferred direction.
  • the embodiments disclosed herein in particular relate to mechanisms for beamformed transmission from a first radio transceiver device 200a towards a second radio transceiver device 200b.
  • a first radio transceiver device 200a a method performed by the first radio transceiver device 200a, a computer program product comprising code, for example in the form of a computer program, that when run on a first radio transceiver device 200a, causes the first radio transceiver device 200a to perform the method.
  • Fig. 2 is a flowchart illustrating embodiments of methods for beamformed transmission towards a second radio transceiver device 200b. The methods are advantageously provided as computer programs 620. The methods are performed by the first radio transceiver device 200a.
  • the first radio transceiver device 200a comprises an antenna array.
  • the antenna array is in turn divided into at least two panels.
  • each panel might represent two CSI-RS ports with orthogonal polarizations.
  • the first radio transceiver device 200a obtains an indication of which precoder has been reported by the second radio transceiver device 200b.
  • the precoder at least corresponds to a phase difference P between the panels.
  • the first radio transceiver device 200a maps the phase difference P to a set of at least one phase difference p(n), n being a positive integer, between individual antenna elements within each panel. If the panels are different, e.g. have different spacing between antenna elements, then there might be one mapping per panel.
  • n* there might in some cases be an ambiguity of the direction, as defined by the selected value n*, due to that the distance between two adjacent panels is larger than half a wavelength of the operating carrier frequency. This might introduce grating lobes that represent multiple equally likely directions (i.e., multiple candidate values of n*). However, in this respect it might be assumed that the correct direction alternative, and thus the correct value of n*, can be found.
  • the first radio transceiver device 200a applies the precoder on the panels for beamformed transmission towards the second radio transceiver device 200b whilst applying the selected phase difference p(n*) between the individual antenna elements within each panel.
  • Beamforming weights as defined by the precoder, are thereby aligned also for the antenna elements within each individual panel to point at that same direction indicated by the selected precoder.
  • the maximum possible array gain by the complete antenna array is thereby achieved.
  • the second radio transceiver device 200b might report a rank and a precoder for that rank.
  • the precoder defines complex weights which, depending on the physical arrangements of the antenna array and its antenna elements, have a beamforming effect in a certain direction per layer.
  • the rank of the precoder is generally defined as how many independent MMO layers can be transmitted using the precoder.
  • a rank one precoder thus implies that only a single layer can be independently transmitted, and so on.
  • the use of a rank one precoder thus corresponds to the use of a port selection codebook.
  • a rank one precoder has been reported by the second radio transceiver device 200b.
  • a rank two precoder where layers differ only by polarization has been reported by the second radio transceiver device.
  • the selected precoder directs the gain for both layers in the same direction towards the second radio transceiver device 200b.
  • phase difference p(n*) can be selected.
  • n* there might be grating lobes that represent multiple equally likely directions.
  • One way to select the correct value of n* is then to use reciprocity-based precoding when the channel quality is good, typically when the distance between the first radio transceiver device 200a and the second radio transceiver device 200b is comparatively small, but to use closed loop precoding when the channel quality is worse, typically when the distance between the first radio transceiver device 200a and the second radio transceiver device 200b is comparatively large.
  • reciprocity measurements might still be used just for a rough estimation of the direction when the channel quality is low and thus assist in the correct selection of direction among the grating lobe alternatives.
  • the first radio transceiver device 200a is configured to perform (optional) steps S106a, SI 06b as part of SI 06:
  • the first radio transceiver device 200a estimates the direction towards the second radio transceiver device 200b expressed as a phase difference p est between individual antenna elements within each panel.
  • the first radio transceiver device 200a selects, among all the phase differences p(n) between the individual antenna elements, the phase difference that is closest to the phase difference p est.
  • Reciprocity based beamforming might not always be used.
  • Other means of uplink transmission can be used similarly to reciprocity based transmission of uplink reference signals for direction estimation described above.
  • uplink data transmission and demodulation reference signals DMRS
  • DMRS demodulation reference signals
  • the direction towards the second radio transceiver device 200b is estimated using non-closed loop precoding. That is, in some embodiments, the direction towards the second radio transceiver device 200b is estimated using directional information obtained during open loop precoding (also referred to as feedback-less precoding, non-closed precoding, or reciprocity-based precoding) of the second radio transceiver device 200b. In some aspects the direction towards the second radio transceiver device 200b is estimated using data of previous communication with the second radio transceiver device 200b.
  • the direction towards the second radio transceiver device 200b is estimated from directional information valid for previous communication between the first radio transceiver device 200a and the second radio transceiver device 200b. Such directional information could be defined by which beam, beams, or beam pattern, the first radio transceiver device 200a has used for previous communication with the second radio transceiver device 200b.
  • the direction towards the second radio transceiver device 200b is estimated using beamforming information. That is, in some embodiments, the direction towards the second radio transceiver device 200b is estimated from a beam management procedure using a grid-of-beam search for the second radio transceiver device 200b.
  • a grid-of-beam search involves the first radio transceiver device 200a to perform a beam management procedure for determining which beam in a grid-of-beams (e.g. defined by Discrete Fourier Transform (DFT) beams) is best for communication to and/or from the the second radio transceiver device 200b.
  • DFT Discrete Fourier Transform
  • the direction towards the second radio transceiver device 200b is estimated using positioning information. That is, in some embodiments, the direction towards the second radio transceiver device 200b is estimated from information of the second radio transceiver device as provided by a global navigation satellite system (GNSS), such as the global positioning system (GPS), or similar.
  • GNSS global navigation satellite system
  • GPS global positioning system
  • the direction towards the second radio transceiver device 200b is estimated from any combination of non-closed loop precoding, data of previous communication with the second radio transceiver device 200b, beamforming information, and positioning information.
  • the direction towards the second radio transceiver device 200b is the direction from the antenna array of the first radio transceiver device 200a towards the second radio transceiver device 200b.
  • the selected precoder is received in response to reference signals having been transmitted.
  • the indication of which precoder has been reported by the second radio transceiver device 200b is obtained in response to the first radio transceiver device 200a having transmitted reference signals towards the second radio transceiver device 200b.
  • the reference signals are Channel State Information Reference Signals (CSI-RS).
  • the reference signals are Synchronization Signal Blocks (SSBs).
  • the precoder is used for data transmission. That is, in some examples, data is transmitted in the beamformed transmission towards the second radio transceiver device 200b.
  • Fig. 3 at (a), (b), and (c) illustrate different scenarios of beamforming performed at the antenna array 240 of the first radio transceiver device 200a towards the second radio transceiver device 200b in a communication network 100b similar to that of Fig. 1 but where the radio access network node, the terminal device, the radio access network, the core network, and the service network all have been omitted for simplification.
  • the antenna array in the illustrative example of Fig. 3 is a linear array.
  • the antenna array consists of eight antenna elements 260. In some embodiments each of the antenna elements is cross-polarized.
  • the antenna array is divided into two panels 250a, 250b. Each panel consists of four antenna elements.
  • the center to center distance between the antenna elements within each panel is d, and the center to center distance between two adjacent panels is D. It is noted that although the panels 250a, 250b in the illustrative example of Fig. 3 are shown as being adjacent each other and consisting of respective adjacent antenna elements, this does not need to be the case and the panels might have other shapes and forms. Generally, one and the same antenna element is not shared by two or more of the panels.
  • each phase difference p(n) between individual antenna elements corresponds to a respective grating lobe.
  • Fig. 3(c) is shown the far- field spatial beam pattern 310c when using beamforming weights designed for beamformed transmission towards the second radio transceiver device 200b whilst applying the selected phase difference p(n*) between the individual antenna elements within each panel.
  • p(n) (R+h ⁇ 2p) -d/D.
  • each of the panels is aligned in the same direction as the precoder. This results in maximum array gain towards the second radio transceiver device 200b.
  • the antenna array might be a two-dimensional array of cross-polarized antenna elements.
  • the antenna elements might be arranged 8-by-8 horizontally and vertically.
  • two orthogonally polarized CSI-RS ports are transmitted from each of the panels and hence the different spatial beam pattern represents the resulting spatial coverage region of the CSI-RS ports.
  • Step 1 The phase difference, P, between the panels according to the selected precoder is obtained.
  • Step 3 A rough direction, expressed as the phase difference, p_est, between adjacent antenna elements, is obtained.
  • Step 4 The value of p(n*) closest to p_est among all the n alternatives of p(n) is obtained by varying the value of n in step 2. That is, n* is selected as the value of n resulting in the smallest (absolute) difference between p(n) and p_est.
  • Step 5 Weights with the phase difference p(n*) between adjacent antenna elements are applied on each panel.
  • Step 6 The selected precoder is applied on the panels, whilst keeping the phase difference as applied in step 5.
  • Fig. 4 schematically illustrates, in terms of a number of functional units, the components of a first radio transceiver device 200a according to an embodiment.
  • Processing circuitry 210 is provided using any combination of one or more of a suitable central processing unit (CPU), multiprocessor, microcontroller, digital signal processor (DSP), etc., capable of executing software instructions stored in a computer program product 610 (as in Fig. 6), e.g. in the form of a storage medium 230.
  • the processing circuitry 210 may further be provided as at least one application specific integrated circuit (ASIC), or field programmable gate array (FPGA).
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the processing circuitry 210 is configured to cause the first radio transceiver device 200a to perform a set of operations, or steps, as disclosed above.
  • the storage medium 230 may store the set of operations
  • the processing circuitry 210 may be configured to retrieve the set of operations from the storage medium 230 to cause the first radio transceiver device 200a to perform the set of operations.
  • the set of operations may be provided as a set of executable instructions.
  • the processing circuitry 210 is thereby arranged to execute methods as herein disclosed.
  • the storage medium 230 may also comprise persistent storage, which, for example, can be any single one or combination of magnetic memory, optical memory, solid state memory or even remotely mounted memory.
  • the first radio transceiver device 200a may further comprise a communications interface 220 at least configured for communications with another radio transceiver device, such as the second radio transceiver device 200b.
  • the communications interface 220 may comprise one or more transmitters and receivers, comprising analogue and digital components.
  • the processing circuitry 210 controls the general operation of the first radio transceiver device 200a e.g.
  • the first radio transceiver device 200a by sending data and control signals to the communications interface 220 and the storage medium 230, by receiving data and reports from the communications interface 220, and by retrieving data and instructions from the storage medium 230.
  • Other components, as well as the related functionality, of the first radio transceiver device 200a are omitted in order not to obscure the concepts presented herein.
  • Fig. 5 schematically illustrates, in terms of a number of functional modules, the components of a first radio transceiver device 200a according to an embodiment.
  • the first radio transceiver device 200a of Fig. 5 comprises a number of functional modules; an obtain module 210a configured to perform step SI 02, a map module 210b configured to perform step SI 04, a select module 210c configured to perform step SI 06, and an apply module 21 Of configured to perform step SI 08.
  • the first radio transceiver device 200a of Fig. 5 may further comprise a number of optional functional modules, such as any of an estimate module 2 lOd configured to perform step S106a, and a select module 210e configured to perform step S106b.
  • each functional module 210a-210f may in one embodiment be implemented only in hardware and in another embodiment with the help of software, i.e., the latter embodiment having computer program instructions stored on the storage medium 230 which when run on the processing circuitry makes the first radio transceiver device 200a perform the corresponding steps mentioned above in conjunction with Fig 5.
  • the modules correspond to parts of a computer program, they do not need to be separate modules therein, but the way in which they are implemented in software is dependent on the programming language used.
  • one or more or all functional modules 210a-210f may be implemented by the processing circuitry 210, possibly in cooperation with the communications interface 220 and/or the storage medium 230.
  • the processing circuitry 210 may thus be configured to from the storage medium 230 fetch instructions as provided by a functional module 210a-210f and to execute these instructions, thereby performing any steps as disclosed herein.
  • the radio transceiver device 200a might be, be a part of, be integrated with, or be collocated with, a radio access network node 140. Further, a first portion of the instructions performed by the first radio transceiver device 200a may be executed in a first device, and a second portion of the of the instructions performed by the first radio transceiver device 200a may be executed in a second device; the herein disclosed embodiments are not limited to any particular number of devices on which the instructions performed by the first radio transceiver device 200a may be executed. Hence, the methods according to the herein disclosed embodiments are suitable to be performed by a first radio transceiver device 200a residing in a cloud computational environment.
  • processing circuitry 210 may be distributed among a plurality of devices, or nodes. The same applies to the functional modules 210a-210f of Fig. 5 and the computer program 620 of Fig. 6.
  • Fig. 6 shows one example of a computer program product 610 comprising computer readable storage medium 630.
  • a computer program 620 can be stored, which computer program 620 can cause the processing circuitry 210 and thereto operatively coupled entities and devices, such as the communications interface 220 and the storage medium 230, to execute methods according to embodiments described herein.
  • the computer program 620 and/or computer program product 610 may thus provide means for performing any steps as herein disclosed.
  • the computer program product 610 is illustrated as an optical disc, such as a CD (compact disc) or a DVD (digital versatile disc) or a Blu-Ray disc.
  • the computer program product 610 could also be embodied as a memory, such as a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), or an electrically erasable programmable read-only memory (EEPROM) and more particularly as a non-volatile storage medium of a device in an external memory such as a USB (Universal Serial Bus) memory or a Flash memory, such as a compact Flash memory.
  • RAM random access memory
  • ROM read-only memory
  • EPROM erasable programmable read-only memory
  • EEPROM electrically erasable programmable read-only memory
  • Fig. 7 is a schematic diagram illustrating a telecommunication network connected via an intermediate network 420 to a host computer 430 in accordance with some embodiments.
  • a communication system includes telecommunication network 410, such as a 3GPP-type cellular network, which comprises access network 411, such as radio access network node 140 in Fig. 1, and core network 414, such as core network 120 in Fig. 1.
  • Access network 411 comprises a plurality of radio access network nodes 412a, 412b, 412c, such as NBs, eNBs, gNBs (each corresponding to the radio access network node 140 of Fig. 1) or other types of wireless access points, each defining a corresponding coverage area, or cell, 413a, 413b, 413c.
  • Each radio access network nodes 412a, 412b, 412c is connectable to core network 414 over a wired or wireless connection 415.
  • a first UE 491 located in coverage area 413c is configured to wirelessly connect to, or be paged by, the corresponding network node 412c.
  • a second UE 492 in coverage area 413a is wirelessly connectable to the corresponding network node 412a. While a plurality of UE 491, 492 are illustrated in this example, the disclosed embodiments are equally applicable to a situation where a sole UE is in the coverage area or where a sole terminal device is connecting to the corresponding network node 412.
  • the UEs 491, 492 correspond to the terminal device 150 of Fig. 1.
  • Telecommunication network 410 is itself connected to host computer 430, which may be embodied in the hardware and/or software of a standalone server, a cloud-implemented server, a distributed server or as processing resources in a server farm.
  • Host computer 430 may be under the ownership or control of a service provider, or may be operated by the service provider or on behalf of the service provider.
  • Connections 421 and 422 between telecommunication network 410 and host computer 430 may extend directly from core network 414 to host computer 430 or may go via an optional intermediate network 420.
  • Intermediate network 420 may be one of, or a combination of more than one of, a public, private or hosted network; intermediate network 420, if any, may be a backbone network or the Internet; in particular, intermediate network 420 may comprise two or more sub-networks (not shown).
  • the communication system of Fig. 7 as a whole enables connectivity between the connected UEs 491, 492 and host computer 430.
  • the connectivity may be described as an over-the-top (OTT) connection 450.
  • Host computer 430 and the connected UEs 491, 492 are configured to communicate data and/or signaling via OTT connection 450, using access network 411, core network 414, any intermediate network 420 and possible further infrastructure (not shown) as intermediaries.
  • OTT connection 450 may be transparent in the sense that the participating communication devices through which OTT connection 450 passes are unaware of routing of uplink and downlink communications.
  • network node 412 may not or need not be informed about the past routing of an incoming downlink communication with data originating from host computer 430 to be forwarded (e.g., handed over) to a connected UE 491. Similarly, network node 412 need not be aware of the future routing of an outgoing uplink communication originating from the UE 491 towards the host computer 430.
  • Fig. 8 is a schematic diagram illustrating host computer communicating via a radio access network node with a UE over a partially wireless connection in accordance with some embodiments.
  • Example implementations, in accordance with an embodiment, of the UE, radio access network node and host computer discussed in the preceding paragraphs will now be described with reference to Fig. 8.
  • host computer 510 comprises hardware 515 including communication interface 516 configured to set up and maintain a wired or wireless connection with an interface of a different communication device of communication system 500.
  • Host computer 510 further comprises processing circuitry 518, which may have storage and/or processing capabilities.
  • processing circuitry 518 may comprise one or more programmable processors, application-specific integrated circuits, field programmable gate arrays or combinations of these (not shown) adapted to execute instructions.
  • Host computer 510 further comprises software 511, which is stored in or accessible by host computer 510 and executable by processing circuitry 518.
  • Software 511 includes host application 512.
  • Host application 512 may be operable to provide a service to a remote user, such as UE 530 connecting via OTT connection 550 terminating at UE 530 and host computer 510.
  • the UE 530 corresponds to the terminal device 150 of Fig. 1.
  • host application 512 may provide user data which is transmitted using OTT connection 550.
  • Communication system 500 further includes radio access network node 520 provided in a telecommunication system and comprising hardware 525 enabling it to communicate with host computer 510 and with UE 530.
  • the radio access network node 520 corresponds to the radio access network node 140 of Fig. 1.
  • Hardware 525 may include communication interface 526 for setting up and maintaining a wired or wireless connection with an interface of a different communication device of communication system 500, as well as radio interface 527 for setting up and maintaining at least wireless connection 570 with UE 530 located in a coverage area (not shown in Fig. 8) served by radio access network node 520.
  • Communication interface 526 may be configured to facilitate connection 560 to host computer 510. Connection 560 may be direct or it may pass through a core network (not shown in Fig.
  • radio access network node 520 further includes processing circuitry 528, which may comprise one or more programmable processors, application-specific integrated circuits, field programmable gate arrays or combinations of these (not shown) adapted to execute instructions.
  • Radio access network node 520 further has software 521 stored internally or accessible via an external connection.
  • Communication system 500 further includes UE 530 already referred to. Its hardware 535 may include radio interface 537 configured to set up and maintain wireless connection 570 with a radio access network node serving a coverage area in which UE 530 is currently located.
  • Hardware 535 of UE 530 further includes processing circuitry 538, which may comprise one or more programmable processors, application-specific integrated circuits, field programmable gate arrays or combinations of these (not shown) adapted to execute instructions.
  • UE 530 further comprises software 531, which is stored in or accessible by UE 530 and executable by processing circuitry 538.
  • Software 531 includes client application 532.
  • Client application 532 may be operable to provide a service to a human or non-human user via UE 530, with the support of host computer 510.
  • an executing host application 512 may communicate with the executing client application 532 via OTT connection 550 terminating at UE 530 and host computer 510.
  • client application 532 may receive request data from host application 512 and provide user data in response to the request data.
  • OTT connection 550 may transfer both the request data and the user data.
  • Client application 532 may interact with the user to generate the user data that it provides.
  • host computer 510 radio access network node 520 and UE 530 illustrated in Fig.
  • Fig. 8 may be similar or identical to host computer 430, one of network nodes 412a, 412b, 412c and one of UEs 491, 492 of Fig. 7, respectively. This is to say, the inner workings of these entities may be as shown in Fig. 8 and independently, the surrounding network topology may be that of Fig. 7.
  • OTT connection 550 has been drawn abstractly to illustrate the communication between host computer 510 and UE 530 via network node 520, without explicit reference to any intermediary devices and the precise routing of messages via these devices.
  • Network infrastructure may determine the routing, which it may be configured to hide from UE 530 or from the service provider operating host computer 510, or both. While OTT connection 550 is active, the network infrastructure may further take decisions by which it dynamically changes the routing (e.g., on the basis of load balancing consideration or reconfiguration of the network).
  • Wireless connection 570 between UE 530 and radio access network node 520 is in accordance with the teachings of the embodiments described throughout this disclosure.
  • One or more of the various embodiments improve the performance of OTT services provided to UE 530 using OTT connection 550, in which wireless connection 570 forms the last segment. More precisely, the teachings of these embodiments may reduce interference, due to improved classification ability of airborne UEs which can generate significant interference.
  • a measurement procedure may be provided for the purpose of monitoring data rate, latency and other factors on which the one or more embodiments improve.
  • the measurement procedure and/or the network functionality for reconfiguring OTT connection 550 may be implemented in software 511 and hardware 515 of host computer 510 or in software 531 and hardware 535 ofUE 530, or both.
  • sensors (not shown) may be deployed in or in association with communication devices through which OTT connection 550 passes; the sensors may participate in the measurement procedure by supplying values of the monitored quantities exemplified above, or supplying values of other physical quantities from which software 511, 531 may compute or estimate the monitored quantities.
  • the reconfiguring of OTT connection 550 may include message format, retransmission settings, preferred routing etc.; the reconfiguring need not affect network node 520, and it may be unknown or imperceptible to radio access network node 520. Such procedures and functionalities may be known and practiced in the art.
  • measurements may involve proprietary UE signaling facilitating host computer’s 510 measurements of throughput, propagation times, latency and the like.
  • the measurements may be implemented in that software 511 and 531 causes messages to be transmitted, in particular empty or ‘dummy’ messages, using OTT connection 550 while it monitors propagation times, errors etc.

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

Abstract

L'invention concerne des mécanismes de transmission formée en faisceau vers un deuxième émetteur-récepteur radio. Un procédé est mise en œuvre par un premier dispositif émetteur-récepteur radio. Le premier dispositif émetteur-récepteur radio comprend un réseau d'antennes divisé en au moins deux panneaux. Le procédé comprend l'obtention d'une indication du fait que le précodeur a été signalé par le deuxième dispositif émetteur-récepteur radio. Le précodeur correspond à une différence de phase P entre les panneaux. Le procédé comprend la mise en correspondance de la différence de phase P avec un ensemble d'au moins une différence de phase p(n), n étant un nombre entier positif, entre des éléments d'antenne individuels au sein de chaque panneau. Le procédé comprend la sélection d'une différence de phase p(n*) parmi l'ensemble d'au moins une différence de phase p(n) dans l'ensemble sur la base d'une direction estimée vers le deuxième dispositif émetteur-récepteur radio, n* étant l'entier positif sélectionné. Le procédé comprend l'application du précodeur aux panneaux pour une transmission formée en faisceau vers le deuxième dispositif émetteur-récepteur radio tout en appliquant la différence de phase p(n*) sélectionnée entre les éléments d'antenne individuels au sein de chaque panneau.
EP19765234.0A 2019-09-04 2019-09-04 Transmission formée en faisceau vers un dispositif émetteur-récepteur radio Withdrawn EP4026258A1 (fr)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018127426A1 (fr) * 2017-01-06 2018-07-12 Telefonaktiebolaget Lm Ericsson (Publ) Précodage d'une transmission à partir d'un réseau d'antennes à panneaux multiples

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EP2945306B1 (fr) * 2013-03-08 2018-11-07 Huawei Technologies Co., Ltd. Procédé de rétroaction d'indication de matrice de précodage, et extrémité de réception et extrémité d'émission
CN107888246B (zh) * 2016-09-29 2023-04-28 华为技术有限公司 基于码本的信道状态信息反馈方法及设备
CN109302219B (zh) * 2017-07-24 2020-09-01 展讯通信（上海）有限公司 预编码的处理方法、基站、用户设备及计算机可读介质

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018127426A1 (fr) * 2017-01-06 2018-07-12 Telefonaktiebolaget Lm Ericsson (Publ) Précodage d'une transmission à partir d'un réseau d'antennes à panneaux multiples

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