WO2016054819A1 - Procédé et dispositif de transmission de signaux, et système - Google Patents

Procédé et dispositif de transmission de signaux, et système Download PDF

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Publication number
WO2016054819A1
WO2016054819A1 PCT/CN2014/088354 CN2014088354W WO2016054819A1 WO 2016054819 A1 WO2016054819 A1 WO 2016054819A1 CN 2014088354 W CN2014088354 W CN 2014088354W WO 2016054819 A1 WO2016054819 A1 WO 2016054819A1
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WIPO (PCT)
Prior art keywords
transmit power
base station
power
precoding matrix
different cells
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PCT/CN2014/088354
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English (en)
Chinese (zh)
Inventor
张雷鸣
刘鹍鹏
刘江华
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华为技术有限公司
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Priority to PCT/CN2014/088354 priority Critical patent/WO2016054819A1/fr
Priority to CN201480021266.2A priority patent/CN105900493B/zh
Publication of WO2016054819A1 publication Critical patent/WO2016054819A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • Embodiments of the present invention relate to communication technologies, and in particular, to the field of beamforming technologies.
  • Beamforming also known as spatial filtering, is a signal processing technique that uses a sensor array to direct transmit and receive signals.
  • the beamforming technique adjusts the parameters of the basic unit of the phase array so that signals of certain angles obtain constructive interference, while signals of other angles acquire destructive interference. Beamforming can be used both for the signal transmitter and for the signal receiver.
  • MIMO Multiple Input Multiple Output
  • the number of antennas in the antenna array increases, which makes it possible to form a narrower beam; on the other hand, the distribution pattern of the antenna array is also from a conventional one-dimensional line array to a two-dimensional plane array. And three-dimensional array evolution, which enables beamforming to be adjusted not only in one direction or dimension, but also in multiple directions or dimensions.
  • LTE Long Term Evolution
  • SINR Signal to Interference plus Noise Ratio
  • the problem with the prior art is that the cell or sector overlap coverage is dry. Disturb.
  • the embodiment of the invention provides a method, a device and a system for transmitting a signal, which are used to solve the problem of interference in the overlapping coverage of a cell or a sector in the prior art.
  • an embodiment of the present invention provides a method for transmitting a signal, where the method includes:
  • the base station determines the direction of the beam and the transmit power of the beam
  • the beam includes at least a first beam and a second beam, where a transmit power of the first beam is smaller than a transmit power of the second beam;
  • the direction of the first beam points to an area covered by overlapping of different cells
  • the direction of the second beam is directed to an area other than the area covered by the overlapping of different cells.
  • an embodiment of the present invention provides an apparatus for transmitting a signal, the apparatus comprising a processor and a transceiver, wherein:
  • the processor is configured to determine a direction of a beam and a transmit power of the beam
  • the transceiver is configured to transmit a signal in a direction of the beam according to a transmit power of the beam;
  • the beam includes at least a first beam and a second beam, where a transmit power of the first beam is smaller than a transmit power of the second beam;
  • the direction of the first beam points to an area covered by overlapping of different cells
  • the direction of the second beam does not point to an area overlapped by different cells.
  • an embodiment of the present invention provides an apparatus for transmitting a signal, where the apparatus includes a determining module for determining a direction of a beam and a transmit power of a beam;
  • a transmitting module configured to transmit a signal in a direction of the beam according to a reflected power of the beam
  • the beam includes at least a first beam and a second beam, where a transmit power of the first beam is smaller than a transmit power of the second beam;
  • the direction of the first beam points to an area covered by overlapping of different cells
  • the direction of the second beam does not point to an area overlapped by different cells.
  • the base station determines the direction of the beam and the transmit power of the beam, the beam includes at least a first beam and a second beam, and the transmit power of the first beam is smaller than the transmit of the second beam Power, and the direction of the first beam is different from the area covered by the cell overlap coverage, so that the transmit power of the beam pointing to the overlapping coverage area of the different cell is smaller than the transmit power of the beam not pointing to the overlapping coverage area of the different cell, so The interference of the first beam pair of the overlapping coverage area with other beams in the area is small, thereby reducing the interference power in the overlapping coverage area of the different cells.
  • FIG. 1 is an application scenario diagram of a mobile communication system according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a method for transmitting a signal according to an embodiment of the present invention
  • FIG. 3 is a block diagram of an apparatus for transmitting a signal according to an embodiment of the present invention.
  • FIG. 4 is a block diagram of an apparatus for transmitting a signal according to an embodiment of the present invention.
  • FIG. 5 is a flow chart of a method for transmitting a signal according to the present invention.
  • FIG. 6 is a schematic diagram of an application scenario provided by the strength according to the present invention.
  • FIG. 7 is a schematic diagram of an application scenario provided by the strength according to the present invention.
  • Embodiments of the present invention provide a method, apparatus, and system for transmitting a signal, where a base station transmits a signal
  • a base station transmits a signal
  • the beam directed to the overlapping coverage area of the cell uses a smaller transmission power, thereby achieving the effect of reducing interference in the overlapping coverage area of the cell.
  • FIG. 1 is a schematic diagram of an application scenario of a mobile communication system according to an embodiment of the present invention.
  • the scenario includes a first base station 101, a second base station 102, and a first terminal 103.
  • the cell formed by each of the first base station 101 and the second base station 102 directly has an overlapping coverage area; the first terminal 103 is located in the overlapping coverage area.
  • the transmission signal of the second base station 102 may be related to the first terminal 103 and the first base station 101. Communication between the two forms interference; vice versa.
  • the embodiment of the present invention provides a method for transmitting a signal
  • the base station mentioned in the embodiment of the present invention may be a beamforming forming technology.
  • the communication device includes, but is not limited to, an LTE base station, an evolved LTE base station, a micro base station, a wireless router, and a wireless repeater.
  • Figure 2 shows the steps of a method of an embodiment of the invention, the steps comprising:
  • Step 201 The base station determines a direction of the beam and a transmit power of the beam.
  • Step 202 The base station transmits a signal in a direction of the beam according to a transmit power of the beam.
  • the beam includes at least a first beam and a second beam, where a transmit power of the first beam is smaller than a transmit power of the second beam;
  • the direction of the first beam points to an area covered by overlapping of different cells
  • the direction of the second beam is directed to an area other than the area covered by the overlapping of different cells.
  • the base station forms at least a first beam and a second beam, and a direction of the first beam is different from a direction of the second beam, and a transmit power of the first beam is different from a transmit power of the second beam.
  • the overlapping coverage area of the different cell is different in the cell.
  • the power of the received signal is relatively small. Since in the overlapping coverage area of the cell, as described above, when the received power of the signal becomes smaller, the interference power with respect to other signals is also reduced, thereby achieving the effect of reducing the interference power.
  • the angle of the projection is.
  • the base stations are distributed on the surface. For a beam formed by a base station, the smaller the tilt angle in the vertical direction is, the farther the beam is irradiated; in other words, if the vertical tilt angle of the beam is smaller, the position where the beam is directed is more likely to be different.
  • An overlapping coverage area between cells when the vertical tilt angle of the beam is less than a certain threshold, the area corresponding to the beam is considered to be an overlapping coverage area between different cells. Setting the threshold by the method of setting the threshold according to the angle of the beam is easy to implement in engineering.
  • the embodiment of the present invention does not limit the direction between any two beams formed by the base station and the transmission power is different, and does not limit the base station to form at least two beams at the same time.
  • the base station determines a transmit power of the beam according to a direction of the beam.
  • the specific method may include one or a combination of the following:
  • the base station sets a transmit power value corresponding to the beam according to a direction of the beam. For example, the base station sets a reflected power of 1 watt for the first beam according to the direction of the first beam; and sets a transmit power of 2 watts for the second beam according to the direction of the second beam.
  • the base station sets a ratio of a transmit power of the beam to a reference power value according to a direction of the beam. For example, the base station sets a ratio of the relative reference power value to the first beam according to the first beam direction to be 0.8; the base station sets a ratio of the relative reference power value to the second beam according to the second beam direction to be 1.2; the reference power value is 1 watt. , then the first beam has a transmit power of 0.8 watts, the second wave The beam has a transmit power of 1.2 watts.
  • the base station sets an attenuation value of the transmit power of the beam with respect to a reference power value according to a direction of the beam. For example, the base station sets the attenuation value of the relative reference power value for the first beam to 6 dB according to the first beam direction; and the base station sets the attenuation value of the relative reference power value to the second beam according to the second beam direction by 3 dB; the reference power value is 1 watt is 30 dBm, then the first beam has a transmit power of 24 dBm or 0.25 watts, and the second beam has a transmit power of 27 dBm or 0.5 watt.
  • the base station sets an increment value of the transmit power of the beam with respect to a reference power value according to a direction of the beam. For example, the base station sets the incremental value of the relative reference power value for the first beam to 3 dB according to the first beam direction; and the base station sets the incremental value of the relative reference power value for the second beam according to the second beam direction by 6 dB; reference power The value is 1 watt or 30 dBm, then the first beam has a transmit power of 33 dBm or 2 watts, and the second beam has a transmit power of 36 dBm or 4 watts.
  • the base station may further include: acquiring, by the base station, a direction of the beam.
  • the method for the base station to acquire the direction of the beam includes at least two types: determining the direction of the beam according to a predefined manner; and determining, by the base station, the direction of the beam according to the message sent by the user equipment UE.
  • the method for determining, by a base station, the direction of the beam according to a predefined manner may include: the base station actively forms a beam, and since the base station forms a beam according to built-in parameters or rules, the base station also has information related to the beam direction, and therefore The direction of the beam can be determined; the base station reads the current phase and/or amplitude information of each antenna element or antenna element group, and calculates the direction of the beam according to the read information.
  • the base station communicates with the UE, and the direction of the beam may be determined by using a message sent by the UE.
  • the base station may determine the direction of the beam according to the beam sequence number sent by the UE.
  • the base station may determine the direction of the beam according to the sequence of the antenna port sent by the UE.
  • the base station may send according to the UE.
  • the precoding matrix sequence number determines the direction of the beam.
  • the method for forming a beam by the base station may include: forming, by the base station, a weighting value on an antenna array, where the weighting value may be a phase weighting value and/or an amplitude weighting value.
  • the base station includes an antenna array, and the antenna The array is composed of a plurality of antenna elements; the base station realizes constructive interference or destructive interference of electromagnetic signals radiated by different antenna elements by adjusting the phase and/or amplitude of the feed signal of each antenna element, thereby forming a certain direction The beam on it.
  • a transmit power of a beam directed to an area covered by overlapping cells of different cells is smaller than a transmit power of a beam not directed to an overlapping coverage area of a different cell, thereby reducing overlap of the different cells. Interference power within the coverage area.
  • FIG. 3 illustrates an apparatus for transmitting a signal according to an embodiment of the present invention.
  • the apparatus includes a processor 301 and a transceiver 302, wherein:
  • the processor 301 is configured to determine a direction of a beam and a transmit power of the beam;
  • the transceiver 302 is configured to transmit a signal in a direction of the beam according to a transmit power of the beam, where the beam includes at least a first beam and a second beam, where a transmit power of the first beam is less than The transmit power of the second beam; wherein the direction of the first beam is directed to an area covered by overlapping of different cells; wherein, the direction of the second beam does not point to an area covered by overlapping of different cells.
  • the overlapping coverage area of the different cells includes: an area corresponding to a beam whose vertical inclination is less than a preset threshold.
  • the direction of the beam includes a vertical tilt angle, which is specifically an angle between a main lobe direction of the beam and a projection of the main lobe direction of the beam at a horizontal plane.
  • the processor 301 is configured to determine, according to a direction of the beam, a transmit power of the beam.
  • the determining, by the processor 301, the transmit power of the beam according to the direction of the beam where the processor 301 is configured to set a transmit power value corresponding to the beam according to a direction of the beam;
  • the processor 301 is configured to set, according to a direction of a beam, a transmit power of the beam relative to The ratio of the reference power values; or
  • the processor 301 is configured to set, according to a direction of a beam, an attenuation value of a transmit power of the beam relative to a reference power value; or
  • the processor 301 is configured to set an increment value of a transmit power of the beam relative to a reference power value according to a direction of the beam.
  • the transmit power of the beam directed to the overlapping coverage area of the different cell is smaller than the transmit power of the beam not directed to the overlapping coverage area of the different cell, thereby reducing the Different cells overlap the interference power in the coverage area.
  • the apparatus includes a determining module 401 and a transmitting module 402, where:
  • a determining module 401 configured to determine a direction of the beam and a transmit power of the beam
  • a transmitting module 402 configured to transmit a signal in a direction of the beam according to a reflected power of the beam, where the beam includes at least a first beam and a second beam, where a transmit power of the first beam is smaller than a Transmitting power of the second beam; wherein, the direction of the first beam is directed to an area covered by overlapping of different cells; wherein, the direction of the second beam does not point to an area covered by overlapping of different cells.
  • the area covered by the different cells overlaps: the area corresponding to the beam whose vertical inclination is less than a preset threshold; wherein the direction of the beam includes a vertical inclination, and the vertical inclination is specifically a main lobe direction of the beam. An angle with the projection of the main lobe direction of the beam at a horizontal plane.
  • the determining module 401 is configured to determine, according to a direction of the beam, a transmit power of the beam.
  • the determining module 401 is configured to determine, according to the direction of the beam, the transmit power of the beam, where the determining module 401 is configured to set the beam pair according to a direction of the beam. The value of the transmit power; or
  • the determining module 401 is configured to set a ratio of a transmit power of the beam to a reference power value according to a direction of the beam; or
  • the determining module 401 is configured to set, according to a direction of the beam, an attenuation value of the transmit power of the beam relative to a reference power value; or
  • the determining module 401 is configured to set an increment value of a transmit power of the beam relative to a reference power value according to a direction of the beam.
  • the transmit power of the beam directed to the overlapping coverage area of the different cell is smaller than the transmit power of the beam not directed to the overlapping coverage area of the different cell, thereby reducing the Different cells overlap the interference power in the coverage area.
  • the embodiment of the invention provides a method for reducing the interference when the communication device is received in the overlapping area of the cell coverage, and also reduces the transmission power of the communication device of the serving cell.
  • the implementation steps of the method proposed in the embodiment of the present invention include:
  • the first communications device determines a transmit power of the beam according to a direction of the beam.
  • the first communications device transmits a signal according to a transmit power of the beam.
  • the beam is formed by a first communication device
  • the direction of the beam includes a vertical tilt angle
  • an optional vertical tilt angle is defined by an angle between a main lobe direction of the beam and a horizontal projection of the main lobe direction of the beam.
  • the first device may form at least a first beam and a second beam, where a vertical tilt angle of the first beam is smaller than a vertical tilt angle of the second beam, and a transmit power of the first beam is smaller than a second beam power.
  • another method for defining the tilt angle in the vertical direction is the angle between the main lobe direction of the beam and the positive direction of the z-axis of the Cartesian coordinate system.
  • the Cartesian coordinate system includes two orthogonal x, y, and z axes, wherein the z axis is perpendicular to the ground, and the positive direction is directed from the ground to the sky.
  • an area corresponding to a beam having a small vertical dip angle includes an edge area of the cell, and an edge area of the cell is also adjacent.
  • the edge area of the cell so in the real scene, the scene of overlapping coverage of the cell is inevitable.
  • the beams formed by the different first communication devices are mutually interfered signals; if the transmit power of the beam in the overlapping coverage area of the corresponding cell is increased, the second communication device in the area receives the signal of the signal.
  • the dry-to-noise ratio is not improved, and the channel capacity is not improved.
  • the transmit power of the beam in the overlapping coverage area of the corresponding cell is reduced, the interference power of the received signal of the second communication device in the area is decreased, although the transmit power may be due to the useful signal. It also drops, resulting in no improvement in the signal to interference and noise ratio, but the first communication device saves power and the energy utilization rate is improved.
  • the beam configuration for a smaller vertical dimension tilt is lower than the beam with a larger vertical dimension tilt, which not only reduces the transmit power.
  • the interference power in the overlapping coverage area of the cell also saves the transmission power of the first communication device used to serve the cell.
  • FIG. 6 shows another possible real-life scenario: the first high-rise building 601 and the second high-rise building 602 are included in the scene, and the first base station 603 and the second base are respectively disposed at different heights of the first high-rise building 601.
  • the base station 604 is configured to provide services for users of different heights of the second high-rise building 602.
  • the first base station 603 and the second base station 604 are set according to the vertical dimension inclination of the beam, and the beam corresponding to the beam having the smaller vertical inclination angle has a larger transmission power than the beam with the larger vertical inclination angle of the beam.
  • the transmit power of the beam so that the interference power in the overlapping coverage area of the cell can be reduced, and the transmission power of the first base station 603 and the second base station 604 can be saved.
  • Embodiment 1 Since the present embodiment is a description of a specific scenario in conjunction with Embodiment 1, the method of acquiring the direction of the beam by the first communication device in Embodiment 1, the method of determining the transmission power of the beam according to the direction of the beam, and the like, It is also applicable in this embodiment, and this embodiment will not be described again.
  • FIG. 7 shows a typical scenario in a mobile communication network.
  • the base station in FIG. 7 corresponds to the first communication device
  • the user equipment UE in FIG. 7 corresponds to the second communication device, of course.
  • the specific form of the first communication device or the second communication device may be changed in combination with other scenarios, and the present invention does not limit this.
  • the scenario shown in FIG. 7 includes: a base station set point, where one or more base stations may be set at the base station set point; and the base station set point is a vertex, and one or more base stations form multiple sectors, which is specific in this scenario.
  • the first sector, the second sector, and the third sector are included, each sector covering a range of 120°.
  • the first UE 701 and the second UE 702 are also included in the scenario.
  • the first UE 702 is located at an intermediate position of the first sector, and the second UE 702 is located at a boundary position of the first sector and the second sector.
  • a base station forming a sector may generate a plurality of beams in a horizontal dimension direction based on a beamforming technique, and a plurality of beams in different horizontal dimension directions cover a sector range of 120°. Since the beam always has a certain width, in a specific implementation process, there may be overlapping coverage at the boundary position of the sector, that is, in the scenario of FIG. 7, located in the first sector and the second sector.
  • the second UE 702 at the border location may simultaneously receive the beam included in the first sector and the beam included in the second sector. Similar to the situation of the UE in the cell overlap coverage area in Embodiment 2, the second UE 702 in this scenario suffers from a serious interference problem, in other words, the sector may have co-channel interference in the adjacent overlapping coverage area.
  • the method provided by the embodiment of the present invention can be used to solve the above problem, that is, to reduce the interference when the communication device is received in the sector coverage overlap region, and also reduce the transmission power of the communication device of the serving cell.
  • the implementation steps of the method proposed in the embodiment of the present invention include:
  • the first communications device determines a transmit power of the beam according to a direction of the beam.
  • the first communications device transmits a signal according to a transmit power of the beam.
  • the beam is formed by a first communication device
  • the direction of the beam includes a horizontal direction angle
  • an optional definition of the horizontal direction angle includes: a main lobe direction of the beam, and a common boundary between a sector where the beam is located and an adjacent sector a minimum angle; wherein the adjacent sector has a common vertex with the sector in which the beam is located, and the first communication device is located at the common vertex.
  • the common vertex corresponds to a base station setting point in the scene shown in FIG.
  • the first communication device may form at least a first beam and a second beam with different angles in a horizontal direction, where a horizontal direction angle of the first beam is smaller than a horizontal direction angle of the second beam, and a transmit power of the first beam is smaller than a first The transmit power of the two beams. More specifically, the direction of the first beam is closer to the common boundary between the sectors, and the direction of the second beam is farther away from the common boundary between the sectors with respect to the direction of the first beam, and the direction of the beam is more set. The transmit power of the first beam is less than the transmit power of the second beam.
  • the first sector is formed by a first base station
  • the second sector may be, but is not limited to, formed by the first base station.
  • the first UE 701 is located at a position close to the center of the first sector.
  • the first base station forms a beam with a larger horizontal angle to serve the first UE 701 or a UE located near the first UE 701; the second UE 702 is in the first fan.
  • the location of the area close to the boundary, correspondingly, the first base station forms a beam with a smaller horizontal direction to serve the second beam UE 702 or the UE in the vicinity of the second UE 702.
  • the second UE 702 Since the second UE 702 is at the boundary position between the first sector and the second sector, the beam corresponding to the area of the second sector and the beam with the smaller angle in the horizontal direction of the first sector are simultaneously received.
  • the two beams are mutually interfering signals; if the transmit power of the two beams is increased, the signal to interference and noise ratio of the received signal of the second UE 702 in the area is not improved, and the channel capacity is not improved;
  • the transmit power of both beams is reduced, and the power of the interference signal in the received signal of the second UE 702 is reduced, although the signal to interference and noise ratio is not improved because the power of the useful signal may decrease at the same time, the first base station at the base station set point Since the transmission power is reduced, that is, power is saved, the energy utilization rate is improved.
  • the lower reflected power of a beam configuration for a smaller horizontal dimension angle relative to a beam with a larger horizontal dimension angle not only reduces the interference power in the sector overlap coverage area, but also saves
  • the sector provides the transmit power of the serving first communication device, thereby increasing energy utilization.
  • Embodiment 1 Since the present embodiment is a description of a specific scenario in conjunction with Embodiment 1, the method of acquiring the direction of the beam by the first communication device in Embodiment 1, the method of determining the transmission power of the beam according to the direction of the beam, and the like, It is also applicable in this embodiment, and this embodiment will not be described again.
  • Embodiments of the present invention provide a method for controlling beam transmit power based on Embodiment 1.
  • the steps of the method of the embodiment of the present invention include:
  • the first communications device indicates a PMI according to a precoding matrix sent by the second communications device, and selects a precoding matrix from the codebook.
  • the method before performing step 901, the method further includes: determining, by the second communications device, the precoding matrix according to the reference signal of the first communications device, and transmitting, to the first communications device, the corresponding The precoding matrix of the precoding matrix indicates the PMI.
  • the codebook applied or stored on the second communications device may be a subset of the codebook applied or stored on the first communications device, and the first communications device may be configured according to the PMI sent by the second communications device.
  • a precoding matrix selected by the second communication device is determined in a codebook of the first communication device.
  • the first communications device determines, according to the precoding matrix, a direction and a transmit power of a corresponding beam.
  • the codebook includes at least a first precoding matrix and a second precoding matrix, where a direction of a beam corresponding to the first precoding matrix is different from a direction of a beam corresponding to the second precoding matrix, Transmit power of a beam corresponding to the first precoding matrix and the second precoding matrix pair The transmit power of the applied beam is different.
  • the precoding matrix W in the codebook satisfies:
  • the V is a power-normalized precoding matrix, that is,
  • 2 1, and ⁇ is a power factor, which may be 1.2, 1.0, 0.8, 0.5, 0.25, etc., which is not limited in the present invention.
  • the power normalized precoding matrix V is related to the direction of the corresponding beam.
  • the first communication device includes four antenna elements having a uniform pitch in the vertical dimension, the spacing between the antenna elements is d, d ⁇ 0, and the wavelength of the transmitted signal is ⁇ . If the first communication device forms a beam, the vertical dimension of the transmitted signal leaves the exit angle as Then, the corresponding power normalized precoding matrix V is:
  • the vertical dimension of the beam formed by the first communication device may be determined according to V.
  • the precoding matrix W in the codebook may be composed of horizontally and vertically precoding vectors.
  • W H is a precoding vector of a horizontal dimension
  • W V is a precoding vector of a vertical dimension
  • ⁇ is the power factor.
  • the embodiment of the present invention does not limit the number and distribution form of the antenna elements in the antenna array of the first communication device.
  • a method for determining a corresponding beam direction and a transmit power according to the precoding matrix is: the first communications device determines a direction of the corresponding beam according to a phase of the precoding matrix, according to the pre The amplitude or power of the coding matrix determines the transmit power of the corresponding beam.
  • the first communication device determines the direction of the beam according to the phase of the precoding matrix, that is, determines the precoding matrix V according to the power of the precoding matrix W.
  • the first communication device determines the transmit power of the beam according to the amplitude or power of the precoding matrix, that is, determines the beam according to the power factor ⁇ of the precoding matrix W.
  • the transmit power more specifically, the power factor ⁇ may be the attenuation or amplification of a reference power value, or the power factor ⁇ directly corresponds to a transmit power value, which is not limited in this embodiment.
  • the transmission power of the beam can be flexibly set according to the direction of the beam.
  • the flexible configuration method provides a feasible method for reducing mutual interference between communication equipment networks, improving network capacity, and reducing power consumption. .
  • the direction of the beam corresponding to the precoding matrix in the codebook is related to the transmit power of the beam, and the specific related manner may be related to a specific application scenario.
  • the codebook of the first base station 401 includes at least a first precoding matrix W 1 and a second precoding matrix W 2 , the first The vertical direction tilt angle of the beam corresponding to the precoding matrix is smaller than the vertical direction tilt angle of the beam corresponding to the second precoding matrix, and the transmit power of the beam corresponding to the first precoding matrix is smaller than the corresponding one of the second precoding matrix The transmit power of the beam.
  • the phase of the first precoding matrix W 1 corresponds to the direction of its corresponding beam
  • the power factor of W 1 corresponds to the transmission power of its corresponding beam
  • the phase of the second precoding matrix W 2 corresponds to the direction of its corresponding beam
  • the power factor of W 2 corresponds to the transmit power of its corresponding beam.
  • the codebook is formed of a first base station sector includes at least a first precoding matrix W 1 and second precoding matrix W 2,
  • the horizontal direction angle of the beam corresponding to the first precoding matrix is smaller than the horizontal direction angle of the beam corresponding to the second precoding matrix
  • the transmit power of the beam corresponding to the first precoding matrix is smaller than the second pre The transmit power of the beam corresponding to the coding matrix.
  • the phase of the first precoding matrix W 1 corresponds to the direction of its corresponding beam
  • the power factor of W 1 corresponds to the transmission power of its corresponding beam
  • the phase of the second precoding matrix W 2 corresponds to the direction of its corresponding beam
  • the power factor of W 2 corresponds to the transmit power of its corresponding beam.
  • Embodiment 1 Since the present embodiment is a description of a specific scenario in conjunction with Embodiment 1, the method of acquiring the direction of the beam by the first communication device in Embodiment 1, the method of determining the transmission power of the beam according to the direction of the beam, and the like, It is also applicable in this embodiment, and this embodiment will not be described again.
  • the embodiment of the invention provides a method for controlling beam transmit power.
  • the steps of the method include:
  • the second communications device selects a precoding matrix from the codebook according to the reference signal sent by the first communications device.
  • the second communications device sends, to the first communications device, a precoding matrix indicating PMI corresponding to the precoding matrix, where the PMI is used to instruct the first communications device to determine a corresponding precoding matrix.
  • the codebook includes at least a first precoding matrix and a second precoding matrix, where a direction of a beam corresponding to the first precoding matrix is different from a direction of a beam corresponding to the second precoding matrix, The transmit power of the beam corresponding to the first precoding matrix is different from the transmit power of the beam corresponding to the second precoding matrix.
  • the reference signal may include a channel state information reference signal (CSI RS) or a demodulation reference signal (demodulation RS, DM RS) or a cell-specific reference. Signal (cell-specific RS, CRS).
  • the second communication device can receive radio resource control (Radio) Resource Control (RRC) signaling or downlink control information DCI) or resource configuration of the reference signal based on the cell identity ID and a reference signal is obtained in the corresponding resource or subframe.
  • Radio Radio Resource Control
  • DCI downlink control information
  • the selecting, by the second communications device, the precoding matrix from the codebook according to the reference signal sent by the first communications device may include: the second communications device according to the A reference indication is determined, the rank indication corresponding to the number of available transport layers; the second communication device selecting a precoding matrix from the codebook according to the rank indication.
  • the precoding matrix W in the codebook satisfies:
  • the V is a power-normalized precoding matrix, that is,
  • 2 1, and ⁇ is a power factor, which may be 1.2, 1.0, 0.8, 0.5, 0.25, etc., which is not limited in the present invention.
  • the power normalized precoding matrix V is related to the direction of the corresponding beam.
  • the first communication device includes four antenna elements having a uniform pitch in the vertical dimension, the spacing between the antenna elements is d, d ⁇ 0, and the wavelength of the transmitted signal is ⁇ . If the first communication device forms a beam, the vertical dimension of the transmitted signal leaves the exit angle as Then, the corresponding power normalized precoding matrix V is:
  • the vertical dimension of the beam formed by the first communication device may be determined according to V.
  • the precoding matrix W in the codebook may be composed of horizontally and vertically precoding vectors.
  • W H is a precoding vector of a horizontal dimension
  • W V is a precoding vector of a vertical dimension
  • ⁇ is the power factor.
  • the embodiment of the present invention does not limit the number and distribution form of the antenna elements in the antenna array of the first communication device.
  • the method for selecting, by the second communications device, the precoding matrix from the codebook according to the reference signal sent by the first communications device comprises: obtaining, by the second communications device, the channel according to the reference signal It is estimated that a precoding matrix is selected from the codebook based on predefined criteria, such as channel capacity or throughput maximization criteria or chord minimization criteria.
  • predefined criteria such as channel capacity or throughput maximization criteria or chord minimization criteria.
  • the method for selecting, by the second communications device, the precoding matrix from the codebook according to the reference signal sent by the first communications device comprises: selecting a pre-selected from the codebook subset according to the reference signal Encoding matrix.
  • the codebook subset is predefined; or a codebook subset reported by the second communications device.
  • the second communications device sends, to the first communications device, a precoding matrix indicating PMI corresponding to the precoding matrix, where the PMI is used to indicate the first communications.
  • the device determines the corresponding precoding matrix, and the method includes: sending the precoding matrix indication PMI to the base station, and sending the precoding matrix indication PMI to the base station, where the PMI may only include one specific value.
  • Another optional method includes transmitting a precoding matrix indication PMI 1 and PMI 2 to the first communication device.
  • the precoding matrix indicates that PMI 1 and PMI 2 may have different time domains or frequency domain granularity; or PMI 1 and PMI 2 respectively represent channel characteristics of different periods or bandwidths, or based on different subframe periods. Or the subband size is obtained. Further, the precoding matrix indicates that PMI 1 and PMI 2 may be transmitted to the first communication device in different time periods.
  • the sending by the first communication device, the precoding matrix indication PMI, where the second communication device is a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH)
  • the second communication device is a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH)
  • PUCCH physical uplink control channel
  • PUSCH physical uplink shared channel
  • the transmission power of the beam can be flexibly set according to the direction of the beam.
  • the flexible configuration method provides a feasible method for reducing mutual interference between communication equipment networks, improving network capacity, and reducing power consumption. .
  • the direction of the beam corresponding to the precoding matrix in the codebook is related to the transmit power of the beam, and the specific related manner may be related to a specific application scenario.
  • the codebook of the first base station 401 includes at least a first precoding matrix W 1 and a second precoding matrix W 2 , the first The vertical direction tilt angle of the beam corresponding to the precoding matrix is smaller than the vertical direction tilt angle of the beam corresponding to the second precoding matrix, and the transmit power of the beam corresponding to the first precoding matrix is smaller than the corresponding one of the second precoding matrix The transmit power of the beam.
  • the phase of the first precoding matrix W 1 corresponds to the direction of its corresponding beam
  • the power factor of W 1 corresponds to the transmission power of its corresponding beam
  • the phase of the second precoding matrix W 2 corresponds to the direction of its corresponding beam
  • the power factor of W 2 corresponds to the transmit power of its corresponding beam.
  • the codebook is formed a first base station sector includes at least a first precoding matrix W 1 and second precoding matrix W 2,
  • the horizontal direction angle of the beam corresponding to the first precoding matrix is smaller than the horizontal direction angle of the beam corresponding to the second precoding matrix
  • the transmit power of the beam corresponding to the first precoding matrix is smaller than the second pre The transmit power of the beam corresponding to the coding matrix.
  • the phase of the first precoding matrix W 1 corresponds to the direction of its corresponding beam
  • the power factor of W 1 corresponds to the transmission power of its corresponding beam
  • the phase of the second precoding matrix W 2 corresponds to the direction of its corresponding beam
  • the power factor of W 2 corresponds to the transmit power of its corresponding beam.

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

Abstract

L'invention concerne un procédé et un dispositif de transmission de signaux, le procédé comprenant les étapes suivantes : une station de base détermine les directions de faisceaux et les puissances de transmission des faisceaux ; selon les puissances de transmission des faisceaux, la station de base transmet des signaux dans les directions des faisceaux. Les faisceaux comprennent au moins un premier faisceau et un deuxième faisceau, la puissance de transmission du premier faisceau est inférieure à la puissance de transmission du deuxième faisceau, la direction du premier faisceau pointe vers une zone de couverture superposée de cellules différentes, et la direction du deuxième faisceau ne pointe pas vers la zone de couverture superposée de cellules différentes. Selon la présente invention, la puissance de transmission du faisceau pointant vers la zone de couverture superposée de cellules différentes est inférieure à la puissance de transmission du faisceau qui ne pointe pas vers la zone de couverture superposée de cellules différentes, et la puissance d'interférence à l'intérieur de la zone de couverture superposée de cellules différentes est ainsi réduite.
PCT/CN2014/088354 2014-10-11 2014-10-11 Procédé et dispositif de transmission de signaux, et système WO2016054819A1 (fr)

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CN114503639B (zh) * 2019-07-19 2024-03-12 株式会社Ntt都科摩 终端以及无线通信方法
CN113939017A (zh) * 2020-06-29 2022-01-14 华为技术有限公司 有效全向辐射功率控制方法、装置及存储介质

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