CN105900493A - Method and device for transmitting signals, and system - Google Patents

Method and device for transmitting signals, and system Download PDF

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Publication number
CN105900493A
CN105900493A CN201480021266.2A CN201480021266A CN105900493A CN 105900493 A CN105900493 A CN 105900493A CN 201480021266 A CN201480021266 A CN 201480021266A CN 105900493 A CN105900493 A CN 105900493A
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power
base station
transmit power
transmitting
different cells
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CN201480021266.2A
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CN105900493B (en
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张雷鸣
刘鹍鹏
刘江华
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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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

Abstract

Provided in an embodiment of the invention are a method and a device for transmitting signals, the method comprising: a base station determines the directions of beams and the transmission powers of the beams; according to the transmission powers of the beams, the base station transmits signals on the directions of the beams. The beams at least comprise a first beam and a second beam, the transmission power of the first beam is less than the transmission power of the second beam, the direction of the first beam points to an overlapping coverage area of different cells, and the direction of the second beam does not point to the overlapping coverage area of different cells. According to the present invention, the transmission power of the beam pointing to the overlapping coverage area of different cells is less than the transmission power of the beam not pointing to the overlapping coverage area of different cells, and interference power within the overlapping coverage area of different cells is thereby reduced.

Description

Method, device and system for transmitting signal Technical Field
The embodiment of the invention relates to the communication technology, in particular to the technical field of beam forming.
Background
Beamforming, also known as spatial filtering, is a signal processing technique that uses an array of sensors to directionally transmit and receive signals. Beamforming techniques allow signals at certain angles to achieve constructive interference and signals at other angles to achieve destructive interference by adjusting parameters of the basic elements of the phased array. Beamforming can be used for both signal transmitting and receiving ends.
In the field of mobile communication, beamforming technology has been widely applied with the popularization of Multiple Input Multiple Output (MIMO) systems. With beamforming techniques, a MIMO system can obtain diversity gain and array gain, which are collectively referred to as beamforming gain.
In order to obtain a larger beamforming gain, on the one hand the number of antennas in the antenna array is increased, which makes it possible to form a narrower beam; on the other hand, the distribution form of the antenna array is evolved from the traditional one-dimensional linear array to a two-dimensional planar array and a three-dimensional array, so that the beam forming can be adjusted not only in one direction or dimension, but also in multiple directions or dimensions.
In a real application scenario, there may be regions of overlapping coverage between the coverage areas of adjacent cells or sectors in the mobile communication network, in which the signals of different cells or sectors received by the user equipment become interference with each other. Taking Long Term Evolution (LTE) system as an example, LTE is a typical Interference limited system, and for a UE in the LTE system, its Signal to Interference plus Noise Ratio (SINR) is dominated by Signal power and Interference power. When the UE of the LTE system is in the overlapping coverage area of the adjacent cell or sector, the signals participating in the overlapping coverage interfere with each other, and no matter which cell or sector the UE selects, the signal of another cell or sector interferes with the normal communication of the UE, thereby reducing the quality of communication.
In summary, a problem with the prior art is that there is interference within the overlapping coverage areas of cells or sectors.
Disclosure of Invention
The embodiment of the invention provides a method, a device and a system for transmitting signals, which are used for solving the problem that interference exists in the overlapping coverage range of cells or sectors in the prior art.
In a first aspect, an embodiment of the present invention provides a method for sending a signal, where the method includes:
the base station determines the direction of a beam and the transmitting power of the beam;
the base station transmits signals in the direction of the beam according to the transmitting power of the beam;
wherein the beams comprise at least a first beam and a second beam, wherein the transmit power of the first beam is less than the transmit power of the second beam;
wherein the direction of the first beam points to an area covered by different cells in an overlapping way;
wherein the direction of the second beam points to a region outside the region of overlapping coverage of different cells.
In a second aspect, an embodiment of the present invention provides an apparatus for transmitting a signal, the apparatus including 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 used for transmitting signals in the direction of the beam according to the transmitting power of the beam;
wherein the beams comprise at least a first beam and a second beam, wherein the transmit power of the first beam is less than the transmit power of the second beam;
wherein the direction of the first beam points to an area covered by different cells in an overlapping way;
wherein the direction of the second beam does not point to an area of overlapping coverage of different cells.
In a third aspect, an embodiment of the present invention provides an apparatus for transmitting a signal, where the apparatus includes a determining module, configured to determine a direction of a beam and a transmission power of the beam;
a transmitting module, configured to transmit a signal in a direction of the beam according to a reflected power of the beam;
wherein the beams comprise at least a first beam and a second beam, wherein the transmit power of the first beam is less than the transmit power of the second beam;
wherein the direction of the first beam points to an area covered by different cells in an overlapping way;
wherein the direction of the second beam does not point to an area of overlapping coverage of different cells.
According to the scheme of the embodiment of the invention, the base station determines the direction of the beam and the transmission power of the beam, the beam at least comprises a first beam and a second beam, the transmission power of the first beam is smaller than that of the second beam, and the direction of the first beam is in the area outside the area overlapped and covered by different cells, so that the transmission power of the beam pointing to the area overlapped and covered by different cells is smaller than that of the beam not pointing to the area overlapped and covered by different cells, therefore, the interference of the first beam in the area overlapped and covered to other beams in the area is small, and the interference power in the area overlapped and covered by different cells is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed in the prior art or the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a diagram of an application scenario of a mobile communication system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method of transmitting a signal according to an embodiment of the present invention;
FIG. 3 is a block diagram of an apparatus for transmitting signals according to an embodiment of the present invention;
FIG. 4 is a block diagram of an apparatus for transmitting signals according to an embodiment of the present invention;
FIG. 5 is a flow chart of a method of transmitting a signal according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an application scenario provided in accordance with an embodiment of the present invention;
fig. 7 is a schematic diagram of an application scenario provided in accordance with an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method, a device and a system for transmitting signals, wherein when a base station transmits signals, a beam pointing to a cell overlapping coverage area uses smaller transmission power, and the effect of reducing interference in the cell overlapping coverage area is realized.
Example 1
Fig. 1 depicts an application scenario of a mobile communication system according to an embodiment of the present invention, where the scenario includes a first base station 101, a second base station 102, and a first terminal 103. Wherein, the cells formed by the first base station 101 and the second base station 102 have overlapping coverage areas directly; the first terminal 103 is located within the overlapping coverage area.
During communication, if a first terminal 103 in the overlapping coverage area selects to communicate with the first base station 101, a transmission signal of the second base station 102 may interfere with communication between the first terminal 103 and the first base station 101; and vice versa.
In order to reduce the interference problem in the overlapping coverage areas between different cells or different sectors, an embodiment of the present invention provides a method for transmitting a signal, where a base station mentioned in the embodiment of the present invention may be a communication device supporting beamforming technology, and specifically 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 relay. Fig. 2 shows the steps of a method of an embodiment of the invention, comprising:
step 201, a base station determines the direction of a beam and the transmitting power of the beam;
step 202, the base station transmits signals in the direction of the wave beam according to the transmitting power of the wave beam;
wherein the beams comprise at least a first beam and a second beam, wherein the transmit power of the first beam is less than the transmit power of the second beam;
wherein the direction of the first beam points to an area covered by different cells in an overlapping way;
wherein the direction of the second beam points to a region outside the region of overlapping coverage of different cells.
Wherein the base station forms at least a first beam and a second beam, the direction of the first beam being different from the direction of the second beam, the transmit power of the first beam being different from the transmit power of the second beam.
In a specific implementation process, since the transmission power of the beam pointing to the overlapping coverage area of different cells in the beams formed by the base station is smaller than the transmission power of the beam not pointing to the overlapping coverage area of different cells, the power of the received signal is relatively small for the user equipment located in the overlapping coverage area of different cells. Since in the cell overlapping coverage area, as described above, when the received power of a signal becomes smaller, the interference power with respect to other signals also decreases in response, thereby achieving the effect of reducing the interference power.
Optionally, the vertical direction inclination angle is smaller than the area corresponding to the wave beam with the preset threshold; the beam direction comprises a vertical direction inclination angle, and the vertical direction inclination angle is specifically an included angle between a main lobe direction of the beam and a projection of the main lobe direction of the beam on a horizontal plane. In a specific implementation, for the scenario shown in fig. 1, the base stations are distributed over the earth's surface. For a beam formed by a base station, the smaller the inclination angle of the vertical direction of the beam is, the longer the irradiation distance of the beam is; in other words, if the vertical tilt angle of the beam is smaller, the beam is directed to a position closer to the overlapping coverage area between different cells, and if the vertical tilt angle of the beam is smaller than a certain threshold, the region corresponding to the beam is considered to be the overlapping coverage area between different cells. The method of setting the threshold value to set the transmission power of the beam according to the angle of the beam is easy to realize in engineering.
The embodiment of the invention does not limit the different directions and different transmitting powers between any two beams formed by the base station, and also does not limit the base station to form at least two beams at the same time.
Optionally, the base station determines the transmission power of the beam according to the direction of the beam. Specific methods may include one or a combination of the following:
① the base station sets the transmit power value corresponding to the beam based on the direction of the beam, for example, the base station sets a reflected power of 1 watt for the first beam based on the direction of the first beam and sets a transmit power of 2 watts for the second beam based on the direction of the second beam.
② the base station sets the ratio of the transmission power of the beam relative to the reference power value according to the direction of the beam, for example, the base station sets the ratio of the relative reference power value for the first beam to 0.8 according to the direction of the first beam, sets the ratio of the relative reference power value for the second beam to 1.2 according to the direction of the second beam, and sets the transmission power of the first beam to 0.8 watt and the transmission power of the second beam to 1.2 watt according to the direction of the second beam.
③ the base station sets the attenuation of the transmitted power of the beam with respect to a reference power level based on the direction of the beam, e.g., the base station sets the attenuation of the first beam with respect to the reference power level to 6dB based on the first beam direction, the base station sets the attenuation of the second beam with respect to the reference power level to 3dB based on the second beam direction, and the reference power level is 1 watt, i.e., 30dBm, then the transmitted power of the first beam is 24dBm, i.e., 0.25 watt, and the transmitted power of the second beam is 27dBm, i.e., 0.5 watt.
④ the base station sets the transmit power of the beam to a delta value relative to a reference power value based on the direction of the beam, e.g., the base station sets the delta value relative to the reference power value to 3dB for a first beam based on a first beam direction, the base station sets the delta value relative to the reference power value to 6dB for a second beam based on a second beam direction, the reference power value is 1 watt, i.e., 30dBm, then the transmit power of the first beam is 33dBm, i.e., 2 watts, and the transmit power of the second beam is 36dBm, i.e., 4 watts.
Optionally, in a specific implementation process, before implementing step 101, the method may further include: the base station acquires the direction of the beam. The method for the base station to acquire the direction of the beam comprises at least two methods: determining the direction of the beam according to a predefined manner; and the base station determines the direction of the wave beam according to the message sent by the user equipment UE.
Specifically, the method for the base station to determine the direction of the beam according to the predefined mode may include: the base station actively forms the beam, and because the base station forms the beam according to the built-in parameters or rules, the base station already has the information related to the beam direction, so that the beam direction can be determined; and the base station reads the phase and/or amplitude information of each current antenna oscillator or antenna oscillator group, and calculates the direction of the wave beam according to the read information.
Specifically, the base station communicates with the UE and the direction of the beam may be determined by a message transmitted by the UE. Optionally, the base station may determine the direction of the beam according to the beam sequence number sent by the UE; optionally, the base station may determine the direction of the beam according to the antenna port number sent by the UE; optionally, the base station may determine the direction of the beam according to the precoding matrix sequence number sent by the UE.
Optionally, in a specific implementation process, the method for forming a beam by the base station may include: the base station is formed by weighting values on the antenna elements, where the weighting values may be phase weighting values and/or amplitude weighting values. Specifically, one possible implementation is: the base station comprises an antenna array, wherein the antenna array consists of a plurality of antenna elements; the base station realizes constructive interference or destructive interference of electromagnetic signals radiated at different antenna elements by adjusting the phase and/or amplitude of a feed source signal exciting each antenna element, thereby forming a beam in a certain direction.
According to the method of the embodiment of the invention, in the beams formed by the base station, the transmitting power of the beams pointing to the overlapped coverage areas of different cells is less than that of the beams not pointing to the overlapped coverage areas of different cells, so that the interference power in the overlapped coverage areas of different cells is reduced.
Example 2
Fig. 3 shows 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 signals in the direction of the beam according to the transmission power of the beam; wherein the beams comprise at least a first beam and a second beam, wherein the transmit power of the first beam is less than the transmit power of the second beam; wherein the direction of the first beam points to an area covered by different cells in an overlapping way; wherein the direction of the second beam does not point to an area of overlapping coverage of different cells.
Optionally, the areas covered by the different cells in an overlapping manner include: and the vertical direction dip angle is smaller than the area corresponding to the wave beam with the preset threshold value.
The beam direction comprises a vertical direction inclination angle, and the vertical direction inclination angle is specifically an included angle between a main lobe direction of the beam and a projection of the main lobe direction of the beam on a horizontal plane.
Optionally, the processor 301 is configured to determine the transmission power of the beam according to the direction of the beam.
Optionally, the processor 301 is configured to determine the transmit power of the beam according to the direction of the beam, including: the processor 301 is configured to set a transmission power value corresponding to a beam according to a direction of the beam; or
The processor 301 is configured to set a ratio of a transmission power of a beam with respect to a reference power value according to a direction of the beam; or
The processor 301 is configured to set an attenuation value of the transmission power of the beam with respect to a reference power value according to the direction of the beam; or
The processor 301 is configured to set an increment value of the transmission power of the beam with respect to a reference power value according to the direction of the beam.
According to the method of the embodiment of the invention, in the formed beams, the transmitting power of the beams pointing to the overlapped coverage areas of different cells is less than that of the beams not pointing to the overlapped coverage areas of different cells, so that the interference power in the overlapped coverage areas of different cells is reduced.
Example 3
Fig. 4 shows an apparatus for transmitting a signal according to an embodiment of the present invention, the apparatus includes a determining module 401 and a transmitting module 402, where:
a determining module 401, configured to determine a direction of a 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 the reflected power of the beam; wherein the beams comprise at least a first beam and a second beam, wherein the transmit power of the first beam is less than the transmit power of the second beam; wherein the direction of the first beam points to an area covered by different cells in an overlapping way; wherein the direction of the second beam does not point to an area of overlapping coverage of different cells.
Optionally, the areas covered by the different cells in an overlapping manner include: the vertical direction inclination angle is smaller than the area corresponding to the wave beam with the preset threshold value; the beam direction comprises a vertical direction inclination angle, and the vertical direction inclination angle is specifically an included angle between a main lobe direction of the beam and a projection of the main lobe direction of the beam on a horizontal plane.
Optionally, the determining module 401 is configured to determine the transmission power of the beam according to the direction of the beam.
Optionally, the determining module 401 is configured to determine, according to the direction of the beam, the transmission power of the beam by: the determining module 401 is configured to set a transmission power value corresponding to a beam according to a direction of the beam; or
The determining module 401 is configured to set a ratio of the transmission power of the beam to a reference power value according to the direction of the beam; or
The determining module 401 is configured to set an attenuation value of the transmission power of the beam relative to a reference power value according to the direction of the beam; or
The determining module 401 is configured to set an increment value of the transmission power of the beam with respect to a reference power value according to the direction of the beam.
According to the method of the embodiment of the invention, in the formed beams, the transmitting power of the beams pointing to the overlapped coverage areas of different cells is less than that of the beams not pointing to the overlapped coverage areas of different cells, so that the interference power in the overlapped coverage areas of different cells is reduced.
Example 4
Embodiments of the present invention provide a method for reducing interference when receiving by a communication device located in a cell coverage overlap area, and at the same time, reducing the transmission power of the communication device serving the cell. The implementation steps of the method provided by the embodiment of the invention comprise:
501, a first communication device determines the transmitting power of a wave beam according to the direction of the wave beam;
502, the first communication device transmits signals according to the transmission power of the beam;
wherein the beam is formed by a first communication device;
the beam direction includes a vertical direction inclination angle, and an optional definition method of the vertical direction inclination angle is an included 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, a vertical direction tilt angle of the first beam being smaller than a vertical direction tilt angle of the second beam, a transmit power of the first beam being smaller than a transmit power of the second beam.
Optionally, another method for defining the tilt angle in the vertical direction is to use an angle between the main lobe direction of the beam and the positive direction of the z-axis of the rectangular coordinate system. The rectangular coordinate system comprises X, Y and Z axes which are orthogonal pairwise, wherein the Z axis is perpendicular to the ground, and the positive direction is pointed to the sky by the ground.
With reference to the scenario in fig. 1, in a specific implementation process, a region corresponding to a beam with a smaller vertical-dimension inclination angle in a beam formed by the first communication device includes an edge area of the local cell; the edge area of the local cell is often also the edge area of the adjacent cell, so the situation of cell overlapping coverage inevitably occurs in a real scene. In a cell overlapping coverage area, beams formed by different first communication equipment are mutually interference signals; if the transmitting power of the wave beam in the overlapping coverage area of the corresponding cell is increased, the signal-to-interference-and-noise ratio of the signal received by the second communication equipment in the area is not increased, and the channel capacity is not increased; if the transmission power of the beam in the overlapping coverage area of the corresponding cell is reduced, the interference power of the signal received by the second communication equipment in the overlapping coverage area is reduced, although the signal-to-interference-and-noise ratio is not improved because the transmission power of the useful signal may also be reduced, the first communication equipment saves power, and the utilization rate of energy is improved.
Thus, by controlling or adjusting the transmit power of the beam according to the vertical dimension tilt of the beam-a beam configuration for a smaller vertical dimension tilt having a lower transmit power relative to a beam with a larger vertical dimension tilt not only reduces the interference power in the overlapping coverage area of the cell, but also saves the transmit power of the first communication device serving the cell.
In a specific implementation, in conjunction with a specific implementation scenario, it may not be possible to set a smaller transmit power for beams with smaller vertical dimension tilt angles, and it may even be the opposite. Fig. 6 shows another possible reality scenario: the scene comprises a first high-rise building 601 and a second high-rise building 602, wherein a first base station 603 and a second base station 604 are respectively arranged at different heights of the first high-rise building 601 to provide services for users at different heights of the second high-rise building 602. Then, according to the above analysis, it can be known that the first base station 603 and the second base station 604 are set according to the vertical dimension tilt angles of the beams, and the transmission power corresponding to the beam with the smaller tilt angle in the vertical direction of the beam is greater than the transmission power corresponding to the beam with the larger tilt angle in the vertical direction of the beam, so that the effects of reducing the interference power in the cell overlapping coverage area and saving the transmission power of the first base station 603 and the second base station 604 can be obtained.
Since this embodiment is described with reference to embodiment 1 for a specific scenario, the descriptions about the method for acquiring the beam direction by the first communication device, the method for determining the transmission power of the beam according to the beam direction, and the like in embodiment 1 are also applicable in this embodiment, and this embodiment is not described again here.
Example 5
In this embodiment, on the basis of embodiment 1, the contents of the embodiment of the present invention are described with reference to a specific scenario. Fig. 7 shows a typical scenario in a mobile communication network, corresponding to the description in embodiment 1, where the base station in fig. 7 corresponds to a first communication device, and the user equipment UE in fig. 7 corresponds to a second communication device, although in combination with other scenarios, the specific form of the first communication device or the second communication device may vary, and the present invention is not limited to this.
Fig. 7 shows a scenario including: a base station set point, at which one or more base stations may be located; with a base station set point as a vertex, one or more base stations form a plurality of sectors, specifically including a first sector, a second sector, and a third sector in this scenario, and each sector covers a range of 120 °. The scenario also includes a first UE701 and a second UE 702. The first UE702 is located in the middle of the first sector, and the second UE702 is located at the border between the first sector and the second sector.
In a scene, a base station forming a sector can generate a plurality of beams in the horizontal dimension direction based on a beam forming technology, and the plurality of beams in different horizontal dimension directions cover a sector range of 120 degrees. Since the beam always has a certain width, in a specific implementation process, there may be overlapping coverage at the boundary position of the sectors, that is, in the scenario of fig. 7, the second UE702 located at the boundary position of the first sector and the second sector may receive the beam included in the first sector and the beam included in the second sector at the same time. Similar to the situation of the UE in the cell overlapping coverage area in embodiment 2, the interference problem suffered by the second UE702 in this scenario is serious, in other words, there may be co-channel interference in the sector in the adjacent overlapping coverage area.
The method provided by the embodiment of the invention can be used for solving the problems, namely reducing the interference problem when the communication equipment in the sector coverage overlapping area receives, and simultaneously reducing the transmission power of the communication equipment of the serving cell. The implementation steps of the method provided by the embodiment of the invention comprise:
801, a first communication device determines the transmission power of a beam according to the direction of the beam;
802, said first communication device transmitting signals according to the transmission power of said beam;
wherein the beam is formed by a first communication device;
wherein the direction of the beam comprises a horizontal direction angle, an optional definition of the horizontal direction angle comprising: the main lobe direction of the wave beam and the minimum included angle of the common boundary of the sector where the wave beam is located and the adjacent sector; the adjacent sectors and the sector where the beam is located have a common vertex, and the first communication device is located at the common vertex. Wherein the common vertex corresponds to a base station set point in the scenario illustrated in fig. 7.
The first communication device may form at least a first beam and a second beam with different angles in a horizontal direction, wherein the horizontal direction angle of the first beam is smaller than the horizontal direction angle of the second beam, and the transmission power of the first beam is smaller than that of the second beam. 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 further away from the common boundary between the sectors with respect to the direction of the first beam, and the transmission power of the first beam is set smaller than that of the second beam with respect to the direction of the first beam.
In conjunction with the scenario of fig. 7, in a specific implementation, the first sector is formed by the first base station, and the second sector may be, but is not limited to being, formed by the first base station. The first UE701 is located near the center of the first sector, and accordingly, the first base station forms a beam with a larger horizontal angle to serve the first UE701 or UEs located near the first UE 701; the second UE702 is located in a position where the first sector is close to the boundary, and accordingly, the first base station forms a beam with a smaller angle in the horizontal direction to serve the second beam UE702 or UEs located near the second UE 702.
The second UE702 is located at the boundary position between the first sector and the second sector, and therefore receives the beam corresponding to the area in the second sector and the beam with the smaller horizontal direction angle in the first sector at the same time. The two beams are mutually interference signals; if the transmission power of the two beams is increased, the signal-to-interference-and-noise ratio of the received signal of the second UE702 in the area is not increased, and the channel capacity is not increased; if the transmission power of the two beams is reduced, the power of the interference signal in the received signal of the second UE702 is reduced, and although the signal to interference plus noise ratio is not improved because the power of the useful signal may be reduced at the same time, the first base station at the base station set point saves power because the transmission power is reduced, and the utilization rate of energy is improved.
Therefore, by controlling or adjusting the transmission power of the beam according to the horizontal dimension angle of the beam, the beam configuration for the smaller horizontal dimension angle has lower reflection power relative to the beam for the larger horizontal dimension angle, so that not only the interference power in the sector overlapping coverage area is reduced, but also the transmission power of the first communication device for serving the sector is saved, thereby improving the energy utilization rate.
Since this embodiment is described with reference to embodiment 1 for a specific scenario, the descriptions about the method for acquiring the beam direction by the first communication device, the method for determining the transmission power of the beam according to the beam direction, and the like in embodiment 1 are also applicable in this embodiment, and this embodiment is not described again here.
Example 6
The embodiment of the invention provides a method for controlling the transmitting power of a beam on the basis of the embodiment 1. The method of the embodiment of the invention comprises the following steps:
901, selecting a precoding matrix from a codebook by the first communication device according to a precoding matrix indicator PMI sent by the second communication device;
optionally, in a specific implementation process, before performing step 901, the method further includes that the second communication device determines a precoding matrix according to a reference signal of the first communication device, and sends a precoding matrix indicator PMI corresponding to the precoding matrix to the first communication device.
In a specific implementation process, the codebook applied or stored in the second communication device may be a subset of the codebook applied or stored in the first communication device, and the first communication device may determine, according to the PMI sent by the second communication device, the precoding matrix selected by the second communication device in the codebook of the first communication device.
902, said first communication device determines the direction and the transmitting power of the corresponding beam according to said pre-coding matrix;
the first communication equipment transmits the wave beam according to the direction and the transmitting power of the wave beam corresponding to the precoding matrix;
the codebook at least comprises a first precoding matrix and a second precoding matrix, the direction of a beam corresponding to the first precoding matrix is different from the direction of a beam corresponding to the second precoding matrix, and the transmission power of the beam corresponding to the first precoding matrix is different from the transmission power of the beam corresponding to the second precoding matrix.
In a specific implementation process, optionally, the precoding matrix W in the codebook satisfies:
W＝αV
wherein V is a pre-coding matrix with normalized power, i.e., having | | V | Y2For example, as shown in fig. 10, the first communication device includes four antenna elements with uniform spacing in the vertical dimension, and the antenna elements are shown as four antenna elements with uniform spacing, and the antenna elements are shown as antenna elements in fig. 10The distance between the two is d, d is not equal to 0, and the wavelength of the transmitted signal is lambda. If the vertical dimension transmission signal departure angle of the beam formed by the first communication device is, the corresponding power normalization precoding matrix V is:
correspondingly, if the power normalized precoding of the precoding matrix selected by the first communication device is V as described above, the vertical dimension transmit signal departure angle of the beam formed by the first communication device may be determined according to V
As another example, the precoding matrix W in the codebook may be composed of horizontal and vertical precoding vectors, where WHPrecoding vectors, W, for the horizontal dimensionVIs the precoding vector for the vertical dimension, is the kr-medical product operation, and α is the power factor.
The embodiment of the invention does not limit the number and the distribution form of the antenna arrays in the antenna array of the first communication device.
In a specific implementation process, optionally, a method for determining a corresponding beam direction and transmit power according to the precoding matrix is that the first communication device determines a direction of a corresponding beam according to a phase of the precoding matrix, and determines transmit power of the corresponding beam according to an amplitude or power of the precoding matrix, as can be known from the description of the above two examples, optionally, the first communication device determines a direction of the beam according to the phase of the precoding matrix, that is, a process determined according to a power normalization precoding matrix V of the precoding matrix W, which is not described herein in the above example, and a method for determining transmit power of the beam according to the amplitude or power of the precoding matrix, that is, determines transmit power of the beam according to the power factor α of the precoding matrix W, more specifically, the power factor α may be attenuation or amplification of a reference power value, or the power factor α directly corresponds to a transmit power value, which is not limited in this embodiment.
Based on the method for determining the direction of the beam and the transmission power of the beam through the precoding matrix, the transmission power of the beam can be flexibly set according to the direction of the beam. Compared with the prior art that the transmitting power of the wave beam cannot be adjusted according to the direction of the wave beam, the method for flexibly configuring the wave beam provides a feasible method for reducing mutual interference among communication equipment networks, improving network capacity and reducing power consumption.
In a specific implementation process, the direction of a beam corresponding to a precoding matrix in a codebook is related to the transmission power of the beam, and a specific related manner may be related to a specific application scenario. For example, in combination with the scenario of fig. 1 and the description of the scenario of fig. 1 in embodiment 4, the codebook of the first base station 401 at least includes the first precoding matrix W1And a second precoding matrix W2The vertical direction inclination of the beam corresponding to the first precoding matrix is smaller than the vertical direction inclination of the beam corresponding to the second precoding matrix, and the transmission power of the beam corresponding to the first precoding matrix is smaller than the transmission power of the beam corresponding to the second precoding matrix. More specifically, the first precoding matrix W1Corresponds to the direction of its corresponding beam, W1The power factor of (a) corresponds to the transmit power of its corresponding beam; second precoding matrix W2Corresponds to the direction of its corresponding beam, W2Corresponding to the transmit power of its corresponding beam. According to the method provided by the embodiment, the effects of reducing the transmission power and the interference power in the cell overlapping area in the embodiment 4 can be achieved, and the method can be combined with the existing method for selecting the beam according to the precoding matrix, so that the method has a wide application prospect.
For another example, with reference to the scenario of fig. 7 and the description of the scenario of fig. 7 in embodiment 4, the codebook of the base station forming the first sector includes at least the first precoding matrix W1And a second precoding matrix W2And 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, and the transmission power of the beam corresponding to the first precoding matrix is smaller than the transmission power of the beam corresponding to the second precoding matrix. More specifically, the first precoding matrix W1Corresponds to the direction of its corresponding beam, W1Corresponding to the power factor of its corresponding beamA transmit power; second precoding matrix W2Corresponds to the direction of its corresponding beam, W2Corresponding to the transmit power of its corresponding beam. According to the method provided by the embodiment, the effects of reducing the transmission power and the interference power in the cell overlapping area in the embodiment 3 can be achieved, and the method can be combined with the existing method for selecting the beam according to the precoding matrix, so that the method has a wide application prospect.
Since this embodiment is described with reference to embodiment 1 for a specific scenario, the descriptions about the method for acquiring the beam direction by the first communication device, the method for determining the transmission power of the beam according to the beam direction, and the like in embodiment 1 are also applicable in this embodiment, and this embodiment is not described again here
Example 7
The embodiment of the invention provides a method for controlling the transmitting power of a beam, which comprises the following steps:
1001, selecting a precoding matrix from a codebook by a second communication device according to a reference signal sent by a first communication device;
1002, the second communication device sends, to the first communication device, a precoding matrix indicator PMI corresponding to the precoding matrix, where the PMI is used to indicate the first communication device to determine a corresponding precoding matrix;
the codebook at least comprises a first precoding matrix and a second precoding matrix, the direction of a beam corresponding to the first precoding matrix is different from the direction of a beam corresponding to the second precoding matrix, and the transmission power of the beam corresponding to the first precoding matrix is different from the transmission power of the beam corresponding to the second precoding matrix.
Optionally, in the process of implementing step 1001, the Reference Signal may include a channel state information Reference Signal (CSI RS), a demodulation Reference Signal (DM RS), or a cell-specific Reference Signal (CRS). The second communication device may obtain the Resource configuration of the reference signal by receiving Radio Resource Control (RRC) signaling or downlink Control information DCI) or based on the cell identification ID and obtain the reference signal in the corresponding Resource or subframe.
Optionally, in the specific implementation process of step 1001, selecting, by the second communication device, a precoding matrix from a codebook according to the reference signal sent by the first communication device may include: the second communication device determines a rank indication according to the reference signal, the rank indication corresponding to the number of available transmission layers; and the second communication equipment selects a precoding matrix from a codebook according to the rank indication.
Optionally, in the process of the specific implementation step 1001, the precoding matrix W in the codebook satisfies:
W＝αV
wherein V is a pre-coding matrix with normalized power, i.e., having | | V | Y2For example, as shown in fig. 10, the first communication device includes four antenna elements with uniform spacing in the vertical dimension, the spacing between the antenna elements is d, d ≠ 0, and the wavelength of the transmission signal is λ, if the vertical dimension transmission signal departure angle of the beam formed by the first communication device is the same, the corresponding power-normalized precoding matrix V is:
correspondingly, if the power normalized precoding of the precoding matrix selected by the first communication device is V as described above, the vertical dimension transmit signal departure angle of the beam formed by the first communication device may be determined according to V
As another example, the precoding matrix W in the codebook may be composed of horizontal and vertical precoding vectors, where WHPrecoding vectors, W, for the horizontal dimensionVIs the precoding vector for the vertical dimension, is the kr-medical product operation, and α is the power factor.
The embodiment of the invention does not limit the number and the distribution form of the antenna arrays in the antenna array of the first communication device.
Optionally, in the process of implementing step 1001, the method for selecting, by the second communication device, a precoding matrix from the codebook according to the reference signal sent by the first communication device includes: the second communication device obtains a channel estimate from the reference signal, and selects a precoding matrix from the codebook based on a predefined criterion, such as a criterion of maximizing channel capacity or throughput or a chordal distance minimization criterion. Selecting a precoding matrix based on a predefined criterion is prior art and is not described herein.
Optionally, in the process of implementing step 1001, the method for selecting, by the second communication device, a precoding matrix from the codebook according to the reference signal sent by the first communication device includes: and selecting a precoding matrix from a codebook subset according to the reference signal. Optionally, the subset of codebooks is predefined; or a subset of the codebook reported by the second communications device.
Optionally, in the process of implementing step 1002, the second communication device sends, to the first communication device, a precoding matrix indicator PMI corresponding to the precoding matrix, where the PMI is used to indicate the first communication device to determine the corresponding precoding matrix, and an optional method includes: the sending of the PMI to the base station includes sending the PMI to the base station, where the PMI may only include one specific value, and at this time, the PMI directly indicates the precoding matrix W, for example, 256 different precoding matrices are shared, and then the PMI may be set to 0, …, and 255 may respectively indicate the precoding matrices W with the labels of 0, 1, and … 255;
another optional method includes transmitting a precoding matrix indication, PMI, to the first communication device1And PMI2. Further, the precoding matrix indicates PMI1And PMI2May have different time domain or frequency domain granularity; or PMI1And PMI2Respectively, representing different periods or bandwidths, or derived based on different subframe periods or subband sizes. Further, the precoding matrix indicates PMI1And PMI2May be differentThe time period is transmitted to the first communication device.
Optionally, the sending of the PMI to the first communication device may be that the second communication device sends the PMI to the first communication device through a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH).
Based on the method for determining the direction of the beam and the transmission power of the beam through the precoding matrix, the transmission power of the beam can be flexibly set according to the direction of the beam. Compared with the prior art that the transmitting power of the wave beam cannot be adjusted according to the direction of the wave beam, the method for flexibly configuring the wave beam provides a feasible method for reducing mutual interference among communication equipment networks, improving network capacity and reducing power consumption.
In a specific implementation process, the direction of a beam corresponding to a precoding matrix in a codebook is related to the transmission power of the beam, and a specific related manner may be related to a specific application scenario. For example, in combination with the scenario of fig. 4 and the description of the scenario of fig. 4 in embodiment 4, the codebook of the first base station 401 at least includes the first precoding matrix W1And a second precoding matrix W2The vertical direction inclination of the beam corresponding to the first precoding matrix is smaller than the vertical direction inclination of the beam corresponding to the second precoding matrix, and the transmission power of the beam corresponding to the first precoding matrix is smaller than the transmission power of the beam corresponding to the second precoding matrix. More specifically, the first precoding matrix W1Corresponds to the direction of its corresponding beam, W1The power factor of (a) corresponds to the transmit power of its corresponding beam; second precoding matrix W2Corresponds to the direction of its corresponding beam, W2Corresponding to the transmit power of its corresponding beam. According to the method provided by the embodiment, the effects of reducing the transmission power and the interference power in the cell overlapping area in the embodiment 2 can be achieved, and the method can be combined with the existing method for selecting the beam according to the precoding matrix, so that the method has a wide application prospect.
For another example, with reference to the scenario of fig. 7 and the description of the scenario of fig. 7 in embodiment 5, the codebook of the base station forming the first sector at least includes the first precoding matrix W1And a second precoding matrix W2And 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, and the transmission power of the beam corresponding to the first precoding matrix is smaller than the transmission power of the beam corresponding to the second precoding matrix. More specifically, the first precoding matrix W1Corresponds to the direction of its corresponding beam, W1The power factor of (a) corresponds to the transmit power of its corresponding beam; second precoding matrix W2Corresponds to the direction of its corresponding beam, W2Corresponding to the transmit power of its corresponding beam. According to the method provided by the embodiment, the effects of reducing the transmission power and the interference power in the cell overlapping area in the embodiment 3 can be achieved, and the method can be combined with the existing method for selecting the beam according to the precoding matrix, so that the method has a wide application prospect.

Claims (12)

  1. A method of transmitting a signal, comprising:
    the base station determines the direction of a beam and the transmitting power of the beam;
    the base station transmits signals in the direction of the beam according to the transmitting power of the beam;
    wherein the beams comprise at least a first beam and a second beam, wherein the transmit power of the first beam is less than the transmit power of the second beam;
    wherein the direction of the first beam points to an area covered by different cells in an overlapping way;
    wherein the direction of the second beam does not point to an area of overlapping coverage of different cells.
  2. The method of claim 1, wherein the areas of overlapping coverage of different cells comprise:
    the vertical direction inclination angle is smaller than the area corresponding to the wave beam with the preset threshold value;
    the beam direction comprises a vertical direction inclination angle, and the vertical direction inclination angle is specifically an included angle between a main lobe direction of the beam and a projection of the main lobe direction of the beam on a horizontal plane.
  3. Method according to claim 1 or 2, wherein the base station determines the transmit power of the beam depending on the direction of the beam.
  4. The method of claim 3, wherein the base station determines the transmit power of the beam according to the direction of the beam, comprising:
    the base station sets a transmitting power value corresponding to the wave beam according to the direction of the wave beam; or
    The base station sets the ratio of the transmitting power of the wave beam relative to a reference power value according to the direction of the wave beam; or
    The base station sets an attenuation value of the transmission power of the beam relative to a reference power value according to the direction of the beam; or
    The base station sets an increment value of the transmission power of the beam relative to a reference power value according to the direction of the beam.
  5. An apparatus for transmitting a signal, 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 used for transmitting signals in the direction of the beam according to the transmitting power of the beam;
    wherein the beams comprise at least a first beam and a second beam, wherein the transmit power of the first beam is less than the transmit power of the second beam;
    wherein the direction of the first beam points to an area covered by different cells in an overlapping way;
    wherein the direction of the second beam does not point to an area of overlapping coverage of different cells.
  6. The apparatus of claim 5, wherein the region of overlapping coverage of different cells comprises:
    the vertical direction inclination angle is smaller than the area corresponding to the wave beam with the preset threshold value;
    the beam direction comprises a vertical direction inclination angle, and the vertical direction inclination angle is specifically an included angle between a main lobe direction of the beam and a projection of the main lobe direction of the beam on a horizontal plane.
  7. The apparatus of claim 5 or 6, wherein the processor is configured to determine the transmit power of the beam according to the direction of the beam.
  8. The apparatus of claim 7, wherein the processor configured to determine the transmit power of the beam based on the direction of the beam comprises:
    the processor is used for setting a transmitting power value corresponding to the wave beam according to the direction of the wave beam; or
    The processor is configured to set a ratio of a transmit power of a beam relative to a reference power value according to a direction of the beam; or
    The processor is configured to set an attenuation value of a transmission power of a beam relative to a reference power value according to a direction of the beam; or
    The processor is configured to set an increment value of a transmit power of a beam with respect to a reference power value according to a direction of the beam.
  9. An apparatus for transmitting a signal, comprising:
    a determining module for determining a direction of a beam and a transmit power of the beam;
    a transmitting module, configured to transmit a signal in a direction of the beam according to a reflected power of the beam;
    wherein the beams comprise at least a first beam and a second beam, wherein the transmit power of the first beam is less than the transmit power of the second beam;
    wherein the direction of the first beam points to an area covered by different cells in an overlapping way;
    wherein the direction of the second beam does not point to an area of overlapping coverage of different cells.
  10. The apparatus of claim 9, wherein the region of overlapping coverage of different cells comprises:
    the vertical direction inclination angle is smaller than the area corresponding to the wave beam with the preset threshold value;
    the beam direction comprises a vertical direction inclination angle, and the vertical direction inclination angle is specifically an included angle between a main lobe direction of the beam and a projection of the main lobe direction of the beam on a horizontal plane.
  11. The apparatus of claim 9 or 10, wherein the determining module is configured to determine the transmit power of the beam according to the direction of the beam.
  12. The apparatus of claim 11, wherein the means for determining the transmit power of the beam according to the direction of the beam comprises:
    the determining module is used for setting a transmitting power value corresponding to the wave beam according to the direction of the wave beam; or
    The determining module is used for setting the ratio of the transmitting power of the beam relative to a reference power value according to the direction of the beam; or
    The determining module is used for setting an attenuation value of the transmitting power of the beam relative to a reference power value according to the direction of the beam; or
    The determining module is used for setting an increment value of the transmitting power of the beam relative to a reference power value according to the direction of the beam.
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