CN105322989B

CN105322989B - Pilot frequency sending method, pilot frequency measuring method and pilot frequency measuring device in MIMO (multiple input multiple output) system

Info

Publication number: CN105322989B
Application number: CN201510424642.9A
Authority: CN
Inventors: 陈润华; 高秋彬
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2014-07-30
Filing date: 2015-07-17
Publication date: 2021-10-12
Anticipated expiration: 2035-07-17
Also published as: WO2016015579A1; CN105322989A

Abstract

The invention discloses a pilot frequency sending and measuring method and device in an MIMO system. The pilot frequency sending method in the MIMO system comprises the following steps: carrying out beam forming on a pilot signal on a first pilot frequency resource of at least one P port configured by a base station, wherein different beam forming matrixes are adopted on different ports of the same first pilot frequency resource, and P is an integer not less than 2; and transmitting the beamformed pilot signal on the at least one P-port first pilot resource. Correspondingly, the invention can solve the problem of high cost of the CSI-RS resource.

Description

Pilot frequency sending method, pilot frequency measuring method and pilot frequency measuring device in MIMO (multiple input multiple output) system

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a pilot transmission method, a pilot measurement method, and a pilot measurement device in a mimo system.

Background

In existing cellular systems, the base station antenna arrays are typically arranged horizontally. Each antenna actually comprises a group of antenna elements, each group of antenna elements is controlled by one radio frequency unit together, and different groups of antenna elements are controlled by different radio frequency units. The beam at the transmitting end of the base station can be adjusted only in the horizontal direction, and the vertical direction is a fixed downward inclination angle, so that various beamforming/precoding techniques and the like are performed based on the channel information in the horizontal direction. In fact, since the wireless signal is propagated in three dimensions in space, the method of fixing the downtilt angle does not optimize the performance of the system. The beam adjustment in the vertical direction has important significance for reducing the inter-cell interference and improving the system performance.

With the development of antenna technology, active antennas capable of independent control of each antenna element have emerged in the industry. With this design, the antenna array will be enhanced from the current two-dimensional horizontal arrangement to the three-dimensional horizontal and vertical arrangement, i.e. the three-dimensional (3D) Multiple-Input Multiple-Output (MIMO) antenna technology. This antenna array approach enables dynamic adjustment of the beam in the vertical direction. Because each antenna element can be controlled individually, this antenna technique is also referred to as Full-Dimension (FD) MIMO.

To realize dynamic adjustment of a beam in a vertical direction and further realize three-dimensional beamforming/precoding, Channel State Information (CSI) reported by User Equipment (UE) needs to be relied on. However, the existing scheme actually combines the feedback of the vertical beamforming vector and the channel feedback in the horizontal dimension. The main technical problems of the scheme include:

combining the feedback of the beamforming vector of the vertical dimension with the channel feedback of the horizontal dimension, the cost of the pilot frequency resource required to be configured by the eNB is large; and

in order to enable the eNB to obtain the best information of the vertical beamforming vector, the UE needs to feed back all measurement results measured each time, which results in a large uplink feedback overhead.

Disclosure of Invention

The invention aims to provide a pilot frequency sending method, a pilot frequency measuring method and a pilot frequency measuring device in an MIMO system, and aims to solve the problem of high cost of CSI-RS resources.

The purpose of the invention is realized by the following technical scheme:

a pilot transmission method in a MIMO system, the method comprising:

carrying out beam forming on a pilot signal on a first pilot frequency resource of at least one P port configured by a base station, wherein different beam forming matrixes are adopted on different ports of the same first pilot frequency resource, and P is an integer not less than 2; and

and transmitting the beamformed pilot signals on the at least one P-port first pilot resource.

Based on the above application scenarios, in order to implement dynamic adjustment of a beam in a vertical direction, an existing scheme combines feedback of a beamforming vector in a vertical dimension with feedback of a channel in a horizontal dimension, so that overhead of a pilot resource required to be configured by an eNB is large. In the technical scheme provided by the embodiment of the invention, the feedback of the beam forming vector of the vertical dimension is not combined with the channel feedback of the horizontal dimension, but the first pilot frequency resource of the P port is configured, the first pilot frequency resource is only used for carrying out the feedback of the beam forming matrix, and the beam forming is carried out on different ports of the first pilot frequency resource of the P port by adopting different beam forming matrixes, so that the feedback of the beam forming matrix is realized, the dynamic adjustment of the beam (in the vertical direction or the horizontal direction) is further realized, and the expenditure of the pilot frequency resource is greatly reduced compared with the prior art.

As a non-limiting embodiment, the eNB configures a pilot resource of a P port to the UE, and the eNB uses different beamforming matrices for beamforming at different ports. The UE performs channel measurement on the configured P ports, selects n ports with the best measurement result, wherein n is an integer greater than or equal to 1, and may also be equal to P, and then notifies the selected port information to the eNB. And the eNB correspondingly carries out channel shaping according to the obtained n ports selected by the UE. The Channel measurement on the P ports may be Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), or Channel state information (Channel state information). When the UE selects n ports, preferably, n > -1 port with the best measurement result may be selected. The n ports fed back by the UE may have various implementation manners, for example, the best n-1 port is selected and the port index (index) thereof is reported, or n < P ports is selected and the selected port index is reported, so that the UE does not need to report all channel measurements on the P ports, but only reports the index of the n < P selected port resources, thereby reducing the uplink feedback overhead. In addition, because the UE measures P ports, the UE complexity is reduced compared to measuring P multi-port pilot resources. Alternatively, the UE may report the measurement quantities on all n-P ports without performing port selection. Because the UE measures P ports, the UE complexity is reduced compared to measuring P multi-port pilot resources.

Optionally, the method further comprises:

receiving information reported by user equipment after measurement is carried out on all or part of ports of the first pilot frequency resource of the at least one P port; and

and selecting at least one beamforming matrix from beamforming matrixes adopted on each port of the first pilot frequency resource of the at least one P port according to the information reported by the user equipment, so as to perform beamforming on a downlink signal sent to the user equipment by adopting the selected at least one beamforming matrix.

Optionally, the information reported by the ue is generated by the ue according to a measurement result of all or part of the ports of the first pilot resource at the at least one P port.

Optionally, the measurement result is a reference signal received power and/or a reference signal received quality and/or a channel state information measurement value; the measurement reporting information includes:

identification information of a port with the highest reference signal received power and/or reference signal received quality measurement value and/or channel state information measurement value; or

The identification information of the first L 'ports is arranged according to the descending order of the reference signal receiving power and/or the reference signal receiving quality measured value and/or the channel state information measured value, and L' is an integer less than the whole or partial port number; or

Reference signal received power and/or reference signal received quality and/or channel state information measurements for all or a portion of the ports of the P-port first pilot resource.

Based on any of the above method embodiments, optionally, the base station is further configured with at least one second pilot resource, and the method further includes:

adopting the selected at least one beamforming matrix to perform beamforming on a pilot signal on at least one second pilot resource configured by the base station; and

and sending the beamformed pilot signals on at least one second pilot resource configured by the base station.

A pilot transmission method in a MIMO system, the method comprising:

respectively carrying out beam forming on pilot signals on P first pilot frequency resources configured by a base station, wherein different beam forming matrixes are adopted on different first pilot frequency resources, and P is an integer not less than 2; and

and transmitting the pilot signals subjected to beam forming on the P first pilot resources respectively.

In order to realize the dynamic adjustment of the beam in the vertical direction, the existing scheme combines the feedback of the beamforming vector in the vertical dimension with the channel feedback in the horizontal dimension, and therefore, the overhead of the pilot frequency resource required to be configured by the eNB is large. In the technical solution provided in the embodiment of the present invention, the feedback of the beamforming vector in the vertical dimension is not combined with the channel feedback in the horizontal dimension, but P first pilot resources are configured, and these first pilot resources are only used for performing the feedback of the beamforming matrix, thereby reducing the overhead of the pilot resources. When P single-port first pilot resources are configured, the overhead of the pilot resources is greatly reduced.

As a non-limiting example, the eNB configures P multiport pilot resources to the UE, and the eN uses different beamforming on different pilot resources. And the UE performs channel measurement on the P configured pilot frequency resources, selects n pilot frequency resources with the best measurement result, wherein n is an integer greater than or equal to 1, and then feeds back the information of the selected pilot frequency resources to the eNB. And the eNB responds to the information of the n pilot frequency resources selected by the UE to carry out channel shaping. The Channel measurement on the pilot resource may be Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), or Channel state information (Channel state information). When the UE selects n pilot resources, it is preferable that n pilot resources with the best measurement result be selected. The information of the n pilot resources fed back by the UE may have various implementation manners, such as selecting the best n-1 pilot resource and reporting its resource index, or selecting n < P pilot resources and reporting the index of the selected resource, or feeding back the measurement result on the n < P pilot resources at the same time. Therefore, the UE only reports the indexes of n < P selected pilot frequency resources without reporting channel measurement on P pilot frequency resources, and the uplink feedback overhead is reduced.

Optionally, the method further comprises:

receiving information reported by the user equipment after the user equipment measures the P first pilot frequency resources; and

and selecting at least one beamforming matrix from the beamforming matrices used on the P first pilot frequency resources according to the information reported by the user equipment, so as to perform beamforming on the downlink signal sent to the user equipment by adopting the selected at least one beamforming matrix.

Optionally, the information reported by the ue is generated by the ue according to the measurement result on the P first pilot resources.

identification information of a first pilot frequency resource with the highest reference signal receiving power and/or reference signal receiving quality and/or channel state information measurement value; or

The identification information of the first L first pilot frequency resources is arranged in descending order according to the reference signal receiving power and/or the reference signal receiving quality and/or the measured value of the channel state information, wherein L is an integer less than P; or

Reference signal received power and/or reference signal received quality and/or channel state information measurements on the P first pilot resources.

Based on the same inventive concept as the method, an embodiment of the present invention provides a pilot transmission apparatus in a MIMO system, where the apparatus includes:

the first beamforming module is used for beamforming a pilot signal on a first pilot resource of at least one P port configured by a base station, different beamforming matrixes are adopted on different ports of the same first pilot resource, and P is an integer not less than 2; and

a first pilot signal sending module, configured to send a beamformed pilot signal on the at least one P-port first pilot resource.

According to the technical scheme provided by the embodiment of the invention, the feedback of the beam forming matrix with the vertical dimension is not combined with the channel feedback with the horizontal dimension, but the first pilot frequency resource of the P port is configured, the first pilot frequency resource is only used for carrying out the feedback of the beam forming matrix, and the beam forming is carried out on different ports of the first pilot frequency resource of the P port by adopting different beam forming matrixes, so that the feedback of the beam forming matrix is realized, the dynamic adjustment of the beam (in the vertical direction or the horizontal direction) is further realized, and compared with the prior art, the expense of the pilot frequency resource is greatly reduced.

Optionally, the apparatus further comprises:

a first measurement report information receiving module, configured to receive information reported after measurement is performed on all or a part of ports of the first pilot resource of the at least one P port by the user equipment; and

and the first beamforming matrix selection module is configured to select at least one beamforming matrix from beamforming matrices used at each port of the P port first pilot resource according to the information reported by the user equipment, so as to perform beamforming on a downlink signal sent to the user equipment by using the selected at least one beamforming matrix.

Optionally, the information reported by the ue is generated by the ue according to a measurement result on all or a part of the ports of the at least one P-port first pilot signal.

identification information of a port with the highest reference signal received power and/or reference signal received quality and/or channel state information measurement value; or

The identification information of the first L 'ports is arranged in descending order according to the reference signal receiving power and/or the reference signal receiving quality and/or the measured value of the channel state information, and L' is an integer less than the whole or partial port number; or

Based on any of the apparatus embodiments described above, optionally, the base station is further configured with at least one second pilot resource, and the apparatus further includes:

a second beamforming module, configured to perform beamforming on a pilot signal on at least one second pilot resource configured by the base station by using the selected at least one beamforming matrix; and

and a second pilot signal sending module, configured to send a beamformed pilot signal on at least one second pilot resource configured by the base station.

Based on the same inventive concept as the method, an embodiment of the present invention further provides a base station, in a mimo system, the base station is configured with at least one P port first pilot resource, P is an integer not less than 2, and the base station includes:

a processor configured to execute code with the following computer program: carrying out beam forming on a pilot signal on a first pilot frequency resource of at least one P port configured by a base station, wherein different beam forming matrixes are adopted on different ports of the same first pilot frequency resource, and P is an integer not less than 2; transmitting a beamformed pilot signal on the at least one P-port first pilot resource; and

a memory configured to hold code of the computer program.

Based on the same inventive concept as the method, an embodiment of the present invention further provides a pilot sending apparatus in a MIMO system, where the apparatus includes:

the third beamforming module is used for beamforming pilot signals on P first pilot resources configured by the base station, wherein different beamforming matrixes are adopted on different first pilot resources, and P is an integer not less than 2;

and a third pilot signal sending module, configured to send the beamformed pilot signals on the P first pilot resources, respectively.

The device provided by the embodiment of the invention does not combine the feedback of the vertical dimension wave beam forming matrix with the feedback of the horizontal dimension channel, but configures P first pilot frequency resources, and the first pilot frequency resources are only used for feeding back the vertical or horizontal wave beam forming matrix, thereby reducing the expense of the pilot frequency resources. When P single-port first pilot resources are configured, the overhead of the pilot resources is greatly reduced.

Optionally, the apparatus further comprises:

a second measurement report information receiving module, configured to receive information reported by the user equipment after the P first pilot resources are measured; and

and the second beamforming matrix selection module is configured to select at least one beamforming matrix from the beamforming matrices used in the P first pilot resources according to the information reported by the user equipment, so as to perform beamforming on a downlink signal sent to the user equipment by using the selected at least one beamforming matrix.

a fourth beamforming module, configured to perform beamforming on a pilot signal on at least one second pilot resource configured by the base station by using the selected at least one beamforming matrix;

and a fourth pilot signal sending module, configured to send a beamformed pilot signal on at least one second pilot resource configured by the base station.

Based on the same inventive concept as the method, an embodiment of the present invention provides a base station, in a mimo system, where the base station is configured with P first pilot resources, where P is an integer not less than 2, and the base station includes:

a processor configured to execute a computer program having the following functions: respectively carrying out beam forming on pilot signals on P first pilot frequency resources configured by the base station, wherein different beam forming matrixes are adopted on different first pilot frequency resources; respectively sending the pilot signals subjected to beam forming on the P first pilot resources;

a memory configured to hold code of the computer program.

The base station provided by the embodiment of the invention does not combine the feedback of the vertical dimension wave beam forming matrix with the feedback of the horizontal dimension channel, but configures P first pilot frequency resources, and the first pilot frequency resources are only used for feeding back the vertical or horizontal wave beam forming matrix, thereby reducing the expense of the pilot frequency resources. When P single-port first pilot resources are configured, the overhead of the pilot resources is greatly reduced.

A pilot frequency measurement method in a MIMO system comprises the following steps:

measuring all or part of ports of at least one P port first pilot frequency resource configured by a base station, wherein P is an integer not less than 2; and

and reporting after measurement is carried out on all or part of the ports of the first pilot frequency resource of the at least one P port.

According to the technical scheme provided by the embodiment of the invention, the feedback of the beam forming matrix with the vertical dimension is not combined with the channel feedback with the horizontal dimension, but the first pilot frequency resource of the P port is configured, and the first pilot frequency resource is only used for carrying out the feedback of the beam forming matrix, so that the feedback of the beam forming matrix is realized, the dynamic adjustment of the beam (in the vertical direction or the horizontal direction) is further realized, and the expense of the pilot frequency resource is greatly reduced compared with the prior art.

Optionally, reporting after performing measurement on all or part of the ports of the at least one P port first pilot resource, includes:

generating measurement report information according to the measurement result on all or part of the ports of the at least one P port first pilot frequency resource; and

and sending the measurement reporting information to the base station.

According to the technical scheme provided by the embodiment of the invention, the measurement result measured every time does not need to be fed back, and only the measurement report information generated according to the measurement result on the first pilot frequency resource of at least one P port needs to be fed back, so that the uplink feedback overhead is reduced.

Reference signal received power and/or reference signal received quality measurements for the all or a portion of the ports of the P-port first pilot resource.

respectively measuring P on P first pilot frequency resources configured by a base station to be an integer not less than 2; and

and reporting after the measurement is carried out on the P first pilot frequency resources.

According to the technical scheme provided by the embodiment of the invention, P first pilot frequency resources are configured instead of combining the feedback of the vertical-dimension wave beam forming matrix and the horizontal-dimension channel feedback, and the first pilot frequency resources are only used for feeding back the vertical or horizontal wave beam forming matrix, so that the expense of the pilot frequency resources is reduced. When P single-port first pilot resources are configured, the overhead of the pilot resources is greatly reduced.

Optionally, reporting after performing measurement on the P first pilot resources includes:

generating measurement report information according to the measurement results on the P first pilot frequency resources; and

and sending the measurement reporting information to the base station.

According to the technical scheme provided by the embodiment of the invention, the measurement result measured each time does not need to be fed back, and only the measurement report information generated according to the measurement result on all or part of the ports of the first pilot frequency resource needs to be fed back, so that the uplink feedback overhead is reduced.

Based on the same inventive concept as the method, an embodiment of the present invention further provides a pilot measurement apparatus in an MIMO system, including:

a first pilot measurement module, configured to perform measurement on all or a part of ports of at least one P port first pilot resource configured by a base station, where P is an integer not less than 2; and

a first measurement reporting module, configured to report after performing measurement on all or part of the ports of the at least one P port first pilot resource.

Optionally, the first measurement reporting module is specifically configured to:

generating measurement report information according to the measurement result on all or part of the ports of the at least one P port first pilot frequency resource; and sending the measurement reporting information to the base station.

Optionally, based on any of the apparatus embodiments above, the measurement result is a reference signal received power and/or a reference signal received quality and/or a channel state information measurement value; the measurement reporting information includes:

Based on the same inventive concept as the method, an embodiment of the present invention further provides a user equipment, including:

a processor configured to execute a computer program having the following functions: measuring all or part of ports of at least one P port first pilot frequency resource configured by a base station, wherein P is an integer not less than 2; reporting after measuring on all or part of the ports of the at least one P port first pilot frequency resource; and

a memory configured to hold code of the computer program.

Based on the same inventive concept as the method, the embodiment of the present invention further provides a pilot measurement apparatus in a MIMO system, the apparatus comprising:

a second pilot measurement module, configured to perform measurement on P first pilot resources configured by the base station, where P is an integer not less than 2; and

and a second measurement reporting module, configured to report after performing measurement on the P first pilot resources.

According to the technical scheme provided by the embodiment of the invention, P first pilot frequency resources are configured instead of combining the feedback of the beam forming matrix with the vertical dimension with the channel feedback with the horizontal dimension, and the first pilot frequency resources are only used for carrying out the feedback of the beam forming matrix, so that the expense of the pilot frequency resources is reduced. When P single-port first pilot resources are configured, the overhead of the pilot resources is greatly reduced.

Optionally, the second measurement reporting module is specifically configured to:

and sending the measurement reporting information to the base station.

a processor configured to execute a computer program having the following functions: respectively measuring P first pilot frequency resources configured by a base station, wherein P is an integer not less than 2; reporting after measuring on the P first pilot frequency resources; and

a memory configured to hold code of the computer program.

Drawings

Fig. 1 is a flowchart of a first pilot sending method according to an embodiment of the present invention;

fig. 2 is a flowchart of a second pilot sending method according to an embodiment of the present invention;

fig. 3 is a flowchart of a first pilot measurement method according to an embodiment of the present invention;

fig. 4 is a flowchart of a second pilot measurement method according to an embodiment of the present invention;

fig. 5a to fig. 5h are schematic diagrams of single-port first pilot resources under a conventional cyclic prefix according to an embodiment of the present invention;

fig. 6a to fig. 6h are schematic diagrams of single-port first pilot resources under an extended cyclic prefix according to an embodiment of the present invention;

fig. 7 is a schematic diagram of a first pilot sending apparatus according to an embodiment of the present invention;

fig. 8 is a schematic diagram of a second pilot sending apparatus according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a first pilot measurement apparatus according to an embodiment of the present invention; and

fig. 10 is a schematic diagram of a second pilot measurement apparatus according to an embodiment of the present invention.

Detailed Description

The following describes the embodiments of the present invention with reference to the drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.

The technical solutions provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings, and the examples are only for explaining the present invention and are not intended to limit the scope of the present invention.

In the MIMO system, a base station is configured with P K port first pilot frequency resources, P is an integer not less than 2, and K is an integer less than the row number or column number of a two-dimensional antenna array of the base station. Of course, as can be understood by those skilled in the art, the value of K is not limited to an integer smaller than the number of rows or columns of the two-dimensional antenna array of the base station, and other suitable values may be selected as needed. It is not excluded that the number of ports of different first pilot resources may be the same or different. The first pilot resource of one K port refers to a group of time frequency resources. The value of P is related to the number of beamforming matrices configured for the user equipment. Optionally, the value of P is the same as the number of beamforming matrices configured for the user equipment. If the beamforming matrix is used for beamforming in the vertical dimension, K is smaller than the number of columns of the two-dimensional antenna array of the base station, and if the beamforming matrix is used for beamforming in the horizontal dimension, K is smaller than the number of rows of the two-dimensional antenna array of the base station. Of course, as can be understood by those skilled in the art, the value of K is not limited to be less than the number of rows of the two-dimensional antenna array of the base station, and other suitable values may be selected as needed. It should be noted that the MIMO system in this application scenario may be, but is not limited to, a 3D/FD MIMO system, and may also be another MIMO system with antennas disposed in the vertical dimension.

Based on such a scenario, a pilot sending method in a MIMO system provided in the embodiment of the present invention is shown in fig. 1, and specifically includes the following operations:

step 100, performing beamforming on pilot signals on P K port first pilot resources configured by the base station, respectively, where different beamforming matrices are used on different first pilot resources. Here, K is a positive integer of 1 or more.

Namely, different beamforming matrixes are adopted to perform beamforming on the first pilot resources of different K ports.

And step 110, sending the beamformed pilot signals to the UE on the P K port first pilot resources, respectively.

In various embodiments of the present invention, the pilot Signal may be, but is not limited to, a CSI-RS, a Cell-specific Reference Signal (CRS), and the like.

The above-described processing may be implemented by, but not limited to, a base station.

The above processing procedure is suitable for dynamic adjustment of beamforming in the vertical direction, and certainly is also suitable for dynamic adjustment of beamforming in the horizontal direction.

In various embodiments of the present invention, a special case of beamforming is to use a beamforming matrix.

Based on the above application scenario, in order to implement dynamic adjustment of a beam in a vertical direction, an existing scheme is to combine feedback of a vertical-dimension beam forming matrix with feedback of a horizontal-dimension channel, so that an eNB needs to configure pilot resources of P M ports, where P is the number of vertical-dimension beam forming matrices, and M is the number of columns of a two-dimensional antenna array. In the technical solution provided in the embodiment of the present invention, the feedback of the vertical-dimension beamforming matrix is not combined with the feedback of the horizontal-dimension channel, but P first pilot resources are configured, and the first pilot resources are only used for performing the feedback of the (vertical or horizontal) beamforming matrix, so that the number of ports of the configured first pilot resources may be smaller than the number of rows or columns of the two-dimensional antenna array, thereby reducing the overhead of the pilot resources. When P single-port first pilot resources are configured, the overhead of the pilot resources is greatly reduced.

In the following embodiments of the present invention, the selection of the vertical beamforming matrix is taken as an example for explanation, and the method of the present invention may also be used for the selection of the horizontal beamforming matrix, and the method is the same and is not described again.

In the embodiment of the present invention, optionally, the method further includes: receiving information reported by UE after measurement on the P K port first pilot frequency resources; and selecting at least one beamforming matrix from the beamforming matrices used on the first pilot resources of the P K ports according to the information reported by the UE, so as to perform beamforming on the downlink signal sent to the UE by adopting the selected at least one beamforming matrix.

In the embodiment of the present invention, the information reported by the UE may be, but is not limited to, the information generated by the UE according to the measurement result on the P K port first pilot resources. Of course, the information reported by the UE may also be the measurement result on the first pilot resources of the P K ports.

The measurement result may be, but is not limited to, a Reference Signal Receiving Power (RSRP) and/or a Reference Signal Receiving Quality (RSRQ) and/or a channel state information measurement value. Taking RSRP and/or RSRQ measurement values as an example, the measurement report information may be, but is not limited to, any of the following:

identification information of a K port first pilot resource with the highest RSRP and/or RSRQ measurement value;

the identification information of the first L K port first pilot resources is arranged according to the descending order of the RSRP and/or the RSRQ measurement value, L is an integer smaller than P, and the identification information of the first pilot resources of the L K ports fed back is arranged according to the ascending order or the descending order of the corresponding RSRP and/or the corresponding RSRQ;

RSRP and/or RSRQ measurements on P K-port first pilot resources. Optionally, RSRQ and/or RSRQ measurements on the fed back P K-port first pilot resources are sorted in ascending or descending order.

The identification information of the K port first pilot resource may be, but is not limited to, an index of the K port first pilot resource.

In the embodiments of the present invention, there are various ways to select at least one of the P vertical beamforming matrices, and some of them are listed below.

And if the measurement reporting information comprises the identification information of the K port first pilot resource with the highest RSRP and/or RSRQ measurement value, selecting the vertical beam forming matrix used on the K port first pilot resource corresponding to the identification information.

If the measurement reporting information includes identification information of first L K-port first pilot resources arranged in descending order according to RSRP and/or RSRQ measurement values, at least one of the vertical beamforming matrices used on the K-port first pilot resources corresponding to the identification information may be selected.

And if the measurement reporting information comprises RSRP and/or RSRQ measurement values on P K-port first pilot resources, sequencing according to the RSRP and/or RSRQ measurement values, and selecting at least one vertical beam forming matrix used on the corresponding K-port first pilot resources.

On the premise of definitely utilizing the selected at least one vertical beamforming matrix to perform vertical beamforming on the downlink signal sent to the UE, in combination with the above illustration, those skilled in the art can obtain other selection manners without creative efforts.

Based on any of the above method embodiments, after at least one vertical beamforming matrix is selected, the selected vertical beamforming matrix may be used to solve other problems, such as beamforming, precoding, and the like for 3D/FD MIMO.

Taking beamforming of 3D/FD MIMO by using at least one selected vertical beamforming matrix as an example, the base station is further configured with at least one second pilot resource, and the corresponding implementation manner may be: performing vertical beamforming on a pilot signal on at least one second pilot resource configured by the base station by using the selected at least one vertical beamforming matrix (that is, performing vertical beamforming on a downlink signal sent to the UE by using the selected at least one vertical beamforming matrix); and transmitting the pilot signals subjected to vertical beamforming on at least one second pilot resource configured by the base station.

There are various implementation manners of performing vertical beamforming on the second pilot resource by using the selected vertical beamforming matrix, and the present invention is not limited to these embodiments, and only a few preferred embodiments are illustrated.

And if the base station selects one vertical beamforming matrix, performing vertical beamforming on pilot signals on all the second pilot resources by using the selected vertical beamforming matrix. And the UE performs measurement on the second pilot frequency resource and feeds back the measurement result. And performing beam forming on the 3D/FD MIMO antenna array according to the measurement result fed back by the UE, and further processing is not required to be performed on the beam forming of the 3D/FD MIMO antenna array.

Assuming that the base station configures two second pilot resources and selects two vertical beamforming matrices, the base station performs vertical beamforming on pilot signals on different second pilot resources by using different vertical beamforming matrices. The UE performs measurements on the two second pilot resources respectively, and feeds back measurement results measured on the two second pilot resources. And selecting a beam forming scheme of the 3D/FD MIMO antenna array according to the feedback result of the UE for respectively measuring the two second pilot frequency resources.

In the MIMO system, a base station is configured with at least one P port first pilot frequency resource, and P is an integer not less than 2. The first pilot resource of the P port refers to a group of time-frequency resources. The value of P is related to the number of beamforming matrices configured for the user equipment. Optionally, the value of P is the same as the number of beamforming matrices configured for the user equipment. The number of the configured P port first pilot frequency resources is less than the number of rows or columns of the two-dimensional antenna matrix. It should be noted that the MIMO system in this application scenario may be, but is not limited to, a 3D/FD MIMO system, and may also be another MIMO system with antennas disposed in the vertical dimension.

For example, the following description will be given by configuring one P port first pilot resource, and the implementation manner of configuring two or more P port first pilot resources may refer to the following description, which is not repeated herein.

Based on such a scenario, another pilot sending method in a MIMO system provided in the embodiment of the present invention is shown in fig. 2, and specifically includes the following operations:

step 200, performing beam forming on a pilot signal on a first pilot resource of at least one P port configured by the base station, where the number of the configured first pilot resources is less than the number of rows or columns of the two-dimensional antenna array of the base station, different beam forming matrixes are used on different ports of the same first pilot resource, and P is an integer not less than 2.

Step 210, sending the beamformed pilot signal on the first pilot resource of the P port.

Based on the above application scenario, in order to implement dynamic adjustment of a beam in a vertical direction, an existing scheme is to combine feedback of a vertical-dimension beam forming matrix with feedback of a horizontal-dimension channel, and therefore, an eNB needs to configure pilot resources of P M ports. In the technical scheme provided by the embodiment of the invention, the feedback of the beam forming matrix with the vertical dimension is not combined with the channel feedback with the horizontal dimension, but the first pilot frequency resource of the P port is configured, the first pilot frequency resource is only used for carrying out the feedback of the beam forming matrix, and the beam forming is carried out on different ports of the first pilot frequency resource of the P port by adopting different beam forming matrixes, so that the feedback of the beam forming matrix is realized, the dynamic adjustment of the beam (in the vertical direction or the horizontal direction) is further realized, and the expenditure of the pilot frequency resource is greatly reduced compared with the prior art.

Optionally, the technical solution provided in the embodiment of the present invention further includes:

In the embodiment of the present invention, the information reported by the UE may be, but is not limited to, the information generated by the UE according to the measurement result on all or part of the ports of the P port first pilot resource. Of course, the information reported by the UE may also be the measurement result on the first pilot resource of the P port.

Wherein the measurement result may be, but is not limited to, RSRP and/or RSRQ measurement values. Taking RSRP and/or RSRQ measurement values as an example, the measurement report information may be, but is not limited to, any of the following:

identification information of the port with the highest RSRP and/or RSRQ measurement value;

the identification information of the first L ' ports is arranged according to the descending order of the RSRP and/or the RSRQ measurement value, L ' is an integer less than the whole or partial port number, and the identification information of the fed back L ' ports is arranged according to the ascending order or the descending order of the corresponding RSRP and/or the corresponding RSRQ;

RSRP and/or RSRQ measurements for all or a portion of the ports of the P port first pilot resource. Optionally, RSRP and/or RSRQ measurements of all or part of the above ports of the fed back P port first pilot resource are arranged in ascending or descending order.

The identification information of the port of the P port first pilot resource may be, but is not limited to, an index of the port.

And if the measurement reporting information comprises the identification information of the port with the highest RSRP and/or RSRQ measurement value, selecting the vertical beam forming matrix used on the port corresponding to the identification information.

If the measurement report information includes identification information of the first L' ports arranged in descending order according to RSRP and/or RSRQ measurement values, at least one of the vertical beamforming matrices used on the ports corresponding to the identification information may be selected.

And if the measurement reporting information comprises the RSRP and/or the RSRQ measurement values of all or part of the ports of the first pilot frequency resource of the P port, selecting at least one of the vertical beam forming matrixes used on the corresponding port according to the sequence of the RSRP and/or the RSRQ measurement values. On the premise of definitely utilizing the selected at least one vertical beamforming matrix to perform vertical beamforming on the downlink signal sent to the UE, in combination with the above illustration, those skilled in the art can obtain other selection manners without creative efforts.

Based on any of the above method embodiments of fig. 2, after at least one vertical beamforming matrix is selected, the selected vertical beamforming matrix may be used to solve other problems, such as beamforming, precoding, and the like for 3D/FD MIMO. The specific implementation manner of the method may refer to the description of the above embodiments, and details are not described herein.

An embodiment of the present invention provides a pilot measurement method in an MIMO system, and as shown in fig. 3, the method specifically includes the following operations:

step 300, performing measurement on P K port first pilot resources configured by the base station, respectively, performing beamforming on different first pilot resources by using different beamforming matrixes, where P is an integer not less than 2, and K is an integer less than the number of rows or columns of the two-dimensional antenna array of the base station. Of course, as can be understood by those skilled in the art, the value of K is not limited to an integer smaller than the number of rows or columns of the two-dimensional antenna array of the base station, and other suitable values may be selected as needed. The number of ports of different first pilot resources may be the same or different.

The first pilot resources of P K ports configured by the base station may be obtained according to a predetermined convention, or the first pilot resources of P K ports configured by the base station may also be obtained through a high-level signaling or the like.

Identification information, subframe offset, period, and the like of the first pilot resource of each K port need to be obtained.

And step 310, reporting after measuring on the first pilot frequency resources of the P K ports.

In various embodiments of the invention, the measurement may be at least one of: RSRP measurement values, RSRQ measurement values, CSI, and the like.

According to the technical scheme provided by the embodiment of the invention, the feedback of the vertical-dimension beam forming matrix is not combined with the feedback of the horizontal-dimension channel, but P first pilot frequency resources are configured, and the first pilot frequency resources are only used for feeding back the vertical-dimension or horizontal-dimension beam forming matrix, so that the number of ports of the configured first pilot frequency resources can be smaller than the number of rows or columns of the two-dimensional antenna array, and the expense of the pilot frequency resources is reduced. When P single-port first pilot resources are configured, the overhead of the pilot resources is greatly reduced.

Optionally, the reporting after the measurement is performed on the first pilot resources of the P K ports includes:

generating measurement report information according to the measurement results on the P K port first pilot frequency resources; and

and sending the measurement reporting information to the base station.

According to the technical scheme provided by the embodiment of the invention, the measurement result measured every time does not need to be fed back, and only the measurement report information generated according to the measurement result on the first pilot frequency resources of the P K ports needs to be fed back, so that the uplink feedback overhead is reduced.

The pilot measurement feedback method is suitable for the first application scenario and is implemented in cooperation with the method shown in fig. 1. It should be noted that the above-mentioned pilot measurement feedback method is not limited to the above-mentioned first application scenario.

One preferred implementation of step 310 above is: and generating measurement report information according to the measurement result on the P K port first pilot frequency resources in a preset time period.

If the measurement result is an RSRP and/or RSRQ measurement value, the content specifically included in the measurement report information may refer to the description of the above embodiment, and is not described herein again.

As shown in fig. 4, another pilot measurement method in an MIMO system according to an embodiment of the present invention specifically includes the following operations:

step 400, measuring all or part of ports of at least one P port first pilot frequency resource configured by the base station, and performing beamforming on different ports of the same first pilot frequency resource by using different beamforming matrixes, wherein the number of the configured first pilot frequency resources is less than the number of rows or columns of a two-dimensional antenna array of the base station, and P is an integer not less than 2.

The first pilot resource of the P port configured by the base station may be obtained according to a predetermined convention, or the first pilot resource of the P port configured by the base station may be obtained through a high-level signaling or the like.

Wherein, the identification information, subframe offset, period, etc. of the first pilot resource of the P port need to be known.

And step 410, reporting after measuring on all or part of the ports of the at least one P port first pilot resource.

and sending the measurement reporting information to the base station.

In addition, if the base station is configured with only one P-port first pilot channel, then the UE need not be capable of processing multiple pilot resources.

A preferred implementation of the above step 410 is: and generating measurement report information according to the measurement result of all or part of the P port first pilot frequency resources in a preset time period.

Still taking the first scenario as an example, an implementation manner of implementing the embodiment of the present invention by cooperating a base station and a UE is described.

Assume that the base station has a set of vertical beamforming matrices, which may be written as V1, V2, … VP, for example, and configures P first pilot resources for a single port or multiple ports. And the base station uses different vertical beamforming matrixes to perform vertical beamforming on different first pilot resources. For example, vertical beamforming is performed on the ith first pilot resource by using a vertical beamforming matrix Vi. And the base station sends CSI-RS to the UE on the first pilot frequency resource after vertical beam forming. And the UE measures each first pilot frequency resource to obtain an RSRP measurement value on the first pilot frequency resource. And then the UE generates measurement report information according to the RSRP measured value on each first pilot frequency resource and sends the measurement report information to the base station. After receiving the measurement report information sent by the UE, the base station may obtain information of an optimal vertical beamforming matrix according to the received measurement report information, where the information may be an optimal vertical beamforming matrix (e.g., V1) or a group of better vertical beamforming matrices (e.g., { V1, V2 }).

Taking the single-port first pilot resource as an example, under a normal cyclic prefix (normal cyclic prefix), the single-port first pilot resource configured by the base station is as shown in fig. 5a to 5 h. Fig. 5a shows that the first pilot resource is allocated at port R15, fig. 5b shows that the first pilot resource is allocated at port R16, fig. 5c shows that the first pilot resource is allocated at port R17, fig. 5d shows that the first pilot resource is allocated at port R18, fig. 5e shows that the first pilot resource is allocated at port R19, fig. 5f shows that the first pilot resource is allocated at port R20, fig. 5g shows that the first pilot resource is allocated at port R21, and fig. 5h shows that the first pilot resource is allocated at port R22. Fig. 6a to 6h show the first pilot resources configured by the base station under the extended cyclic prefix (extended cyclic prefix). Fig. 6a shows that the first pilot resource is allocated at port R15, fig. 6b shows that the first pilot resource is allocated at port R16, fig. 6c shows that the first pilot resource is allocated at port R17, fig. 6d shows that the first pilot resource is allocated at port R18, fig. 6e shows that the first pilot resource is allocated at port R19, fig. 6f shows that the first pilot resource is allocated at port R20, fig. 6g shows that the first pilot resource is allocated at port R21, and fig. 6h shows that the first pilot resource is allocated at port R22.

Still taking the second scenario as an example, an implementation manner of implementing the embodiment of the present invention by matching a base station and a UE is described.

The base station is configured with a first pilot resource of one P port. The UE is configured to perform RSRP measurements on L ports of the first pilot resource. The base station is configured with a set of vertical beamforming matrices, which may be written as V1, V2, … VP, for example. And the base station adopts different vertical beam forming matrixes to carry out vertical beam forming on each port in the first pilot frequency resource of the P port. For example, the ith port performs vertical beamforming using a vertical beamforming matrix Vi. And the base station sends CSI-RS to the UE on the first pilot frequency resource after vertical beam forming. And the UE measures each port of the first pilot frequency resource to obtain an RSRP measuring value on the port. And then the UE generates measurement report information according to the RSRP measurement value on each port and sends the measurement report information to the base station. After receiving the measurement report information sent by the UE, the base station may obtain information of an optimal vertical beamforming matrix according to the received measurement report information, where the information may be an optimal vertical beamforming matrix (e.g., V1) or a group of better vertical beamforming matrices (e.g., { V1, V2 }).

Compared with the previous application scenario, the implementation manner corresponding to the second application scenario further reduces the pilot overhead. This is because: the pilot resource in LTE adopts CDM/FDM design, and each pilot port occupies two resource elements. In the implementation manner of the application scenario one, if P single-port first pilot resources are configured, the overhead of the first pilot resources is 2P resource elements; if N multi-port first pilot resources are configured, the overhead of the first pilot resources may be increased. Compared with the implementation mode of the second application scenario, only P resource elements are needed, and the overhead of the first pilot frequency resource is reduced by at least half.

Compared with the previous application scenario, the implementation manner corresponding to the second application scenario further reduces the pilot signaling overhead. In the implementation of the first application scenario, P first pilot resources require P high-layer signaling, but in the implementation of the second application scenario, only one high-layer signaling is required.

Based on the same inventive concept as the method, an embodiment of the present invention provides a pilot transmission apparatus in a MIMO system, as shown in fig. 7, the apparatus includes:

a third beamforming module 701, configured to perform beamforming on pilot signals on P K-port first pilot resources configured by the base station, where different beamforming matrices are used on different first pilot resources, P is an integer not less than 2, and K is an integer less than the number of rows or columns of the two-dimensional antenna array of the base station; and

a third pilot signal sending module 702, configured to send a beamformed pilot signal to the user equipment on the P K-port first pilot resources, respectively.

Optionally, the apparatus further comprises:

a second measurement report information receiving module, configured to receive information reported after the user equipment performs measurement on the P K port first pilot resources; and

and the second beamforming matrix selection module is configured to select at least one beamforming matrix from the beamforming matrices used in the P K-port first pilot resources according to the information reported by the user equipment, so as to perform beamforming on a downlink signal sent to the user equipment by using the selected at least one beamforming matrix.

Optionally, the information reported by the UE may be, but is not limited to, the information generated by the UE according to the measurement result on the P K port first pilot resources. Of course, the information reported by the UE may also be the measurement result on the first pilot resources of the P K ports.

Optionally, the measurement result is a reference signal received power and/or a reference signal received quality measurement value; the measurement reporting information includes:

identification information of a first pilot resource of a K port with the highest reference signal received power and/or reference signal received quality measurement value; or

The identification information of the first pilot frequency resources of the first L K ports is arranged in descending order according to the reference signal receiving power and/or the reference signal receiving quality measured value, wherein L is an integer less than P; or

Reference signal received power and/or reference signal received quality measurements on the P K port first pilot resources.

a fourth beamforming module, configured to perform beamforming on a pilot signal on at least one second pilot resource configured by the base station by using the selected at least one beamforming matrix; and

Based on the same inventive concept as the method, an embodiment of the present invention provides a base station, in a mimo system, the base station is configured with P K port first pilot resources, P is an integer not less than 2, and K is an integer less than the number of rows or columns of a two-dimensional antenna array of the base station, and the base station includes:

a processor configured to execute a computer program having the following functions: respectively carrying out beam forming on pilot signals on P K port first pilot resources configured by the base station, wherein different beam forming matrixes are adopted on different first pilot resources; respectively sending a pilot signal subjected to beam forming to user equipment on the P K port first pilot resources; and

a memory configured to hold code of the computer program.

In the base station provided in the embodiment of the present invention, the feedback of the vertical-dimension beamforming matrix is not combined with the feedback of the horizontal-dimension channel, but P first pilot resources are configured, and the first pilot resources are only used for performing the feedback of the vertical-dimension or horizontal-dimension beamforming matrix, so that the number of ports of the configured first pilot resources may be smaller than the number of rows or columns of the two-dimensional antenna array, thereby reducing the overhead of the pilot resources. When P single-port first pilot resources are configured, the overhead of the pilot resources is greatly reduced.

Based on the same inventive concept as the method, an embodiment of the present invention further provides a pilot transmitting apparatus in a MIMO system, as shown in fig. 8, the apparatus includes:

a first beamforming module 801, configured to perform beamforming on a pilot signal on a first pilot resource of at least one P port configured by a base station, where the number of the configured first pilot resources is less than the number of rows or columns of a two-dimensional antenna array of the base station, different beamforming matrices are used on different ports of the same first pilot resource, and P is an integer not less than 2; and

a first pilot signal sending module 802, configured to send a beamformed pilot signal to the user equipment on the at least one P-port first pilot resource.

According to the technical scheme provided by the embodiment of the invention, the feedback of the beam forming matrix with the vertical dimension is not combined with the channel feedback with the horizontal dimension, but the first pilot frequency resource of the P port is configured, the first pilot frequency resource is only used for feeding back the beam forming matrix with the vertical dimension or the horizontal dimension, and the beam forming is carried out on different ports of the first pilot frequency resource of the P port by adopting different beam forming matrixes, so that the feedback of the beam forming matrix with the vertical dimension or the horizontal dimension is realized, the dynamic adjustment of the beam in the vertical direction or the horizontal direction is further realized, and compared with the prior art, the expenditure of the pilot frequency resource is greatly reduced.

Optionally, the apparatus further comprises:

a first measurement report information receiving module, configured to report information after measurement is performed on all or a part of ports of the first pilot resource of the at least one P port; and

Optionally, the information reported by the ue is generated by the ue according to the measurement result on the P K port first pilot resources.

identification information of a port with the highest reference signal received power and/or reference signal received quality measurement value; or

The identification information of the first L 'ports is arranged according to the descending order of the reference signal receiving power and/or the reference signal receiving quality measured value, and L' is an integer less than the whole or partial port number; or

a processor configured to execute code with the following computer program: carrying out beam forming on pilot signals on at least one P port first pilot frequency resource configured by a base station, wherein the number of the configured first pilot frequency resources is less than the number of rows or columns of a two-dimensional antenna array of the base station, different beam forming matrixes are adopted on different ports of the same first pilot frequency resource, and P is an integer not less than 2; sending a beamformed pilot signal to the user equipment on the at least one P port first pilot resource; and

a memory configured to hold code of the computer program.

In the base station provided by the embodiment of the invention, the feedback of the beam forming matrix with the vertical dimension is not combined with the channel feedback with the horizontal dimension, but the first pilot frequency resource of the P port is configured, the first pilot frequency resource is only used for feeding back the beam forming matrix with the vertical dimension or the horizontal dimension, and the beam forming is carried out on different ports of the first pilot frequency resource of the P port by adopting different beam forming matrixes, so that the feedback of the beam forming matrix with the vertical dimension or the horizontal dimension is realized, the dynamic adjustment of the beam in the vertical direction or the horizontal direction is further realized, and compared with the prior art, the expense of the pilot frequency resource is greatly reduced.

Based on the same inventive concept as the method, an embodiment of the present invention further provides a pilot measurement apparatus in a MIMO system, as shown in fig. 9, including:

a second pilot measurement module 901, configured to perform measurement on P K port first pilot resources configured in a base station, where different beamforming matrices are used for beamforming on different first pilot resources, P is an integer no less than 2, and K is an integer less than the number of rows or columns of a two-dimensional antenna array of the base station; and

a second measurement reporting module 902, configured to report after performing measurement on the P K port first pilot resources.

According to the technical scheme provided by the embodiment of the invention, the feedback of the beam forming matrix with the vertical dimension is not combined with the channel feedback with the horizontal dimension, but P first pilot frequency resources are configured, and the first pilot frequency resources are only used for carrying out the feedback of the beam forming matrix, so that the number of ports of the configured first pilot frequency resources can be smaller than the number of rows or columns of the two-dimensional antenna array, and the expense of the pilot frequency resources is reduced. When P single-port first pilot resources are configured, the overhead of the pilot resources is greatly reduced.

Optionally, the second measurement reporting module 902 is specifically configured to:

and sending the measurement reporting information to the base station.

a processor configured to execute a computer program having the following functions: measuring on P K port first pilot frequency resources configured by a base station respectively, and performing beam forming on different first pilot frequency resources by adopting different beam forming matrixes respectively, wherein P is an integer not less than 2, and K is an integer less than the row number or column number of a two-dimensional antenna array of the base station; measuring and reporting the P K ports of the first pilot frequency resources; and

a memory configured to hold code of the computer program.

Based on the same inventive concept as the method, an embodiment of the present invention further provides a device for reporting pilot measurement in an MIMO system, where as shown in fig. 10, the device includes:

a first pilot measurement module 1001, configured to measure on all or a part of ports of at least one P port first pilot resource configured by a base station, where the number of the configured first pilot resources is smaller than the number of rows or columns of a two-dimensional antenna array of the base station, different ports of the same first pilot resource use different beamforming matrices to perform beamforming, and P is an integer not smaller than 2; and

a first measurement reporting module 1002, configured to report after performing measurement on all or part of the ports of the at least one P port first pilot resource.

Optionally, the first measurement reporting module 1002 is specifically configured to:

According to the technical scheme provided by the embodiment of the invention, the measurement result measured every time does not need to be fed back, and only the measurement report information generated according to the measurement result on all or part of the first pilot frequency resource of the P port needs to be fed back, so that the uplink feedback overhead is reduced.

Reference signal received power and/or reference signal received quality measurements for the all or a portion of the ports of the at least one P-port first pilot resource.

a processor configured to execute a computer program having the following functions: measuring all or part of ports of at least one P port first pilot frequency resource configured by a base station, wherein the number of the configured first pilot frequency resources is less than the number of rows or columns of a two-dimensional antenna array of the base station, different beam forming matrixes are adopted on different ports of the same first pilot frequency resource for beam forming, and P is an integer not less than 2; reporting after measuring on all or part of the ports of the at least one P port first pilot frequency resource; and

a memory configured to hold code of the computer program.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A pilot transmission method in a mimo system, comprising:

transmitting a beamformed pilot signal on the at least one P-port first pilot resource;

the method further comprises the following steps: receiving information reported by user equipment after measurement is carried out on all or part of ports of the first pilot frequency resource of the at least one P port; and

selecting at least one beamforming matrix from beamforming matrices adopted by each port of the at least one P port first pilot resource according to information reported by the user equipment, so as to perform beamforming on a downlink signal sent to the user equipment by adopting the selected at least one beamforming vector;

wherein the first pilot resource is only used for feedback of a beamforming matrix.

2. The method of claim 1, wherein the information reported by the UE is generated by the UE according to measurement results of all or a portion of the ports of the first pilot resources at the at least one P port.

3. The method according to claim 2, wherein the measurement result is a reference signal received power and/or a reference signal received quality and/or a channel state information measurement value;

wherein the measurement reporting information includes:

4. The method according to any of claims 1 to 3, wherein the base station is further configured with at least one second pilot resource,

wherein the method further comprises:

5. A pilot transmission method in a mimo system, comprising:

respectively sending the pilot signals subjected to beam forming on the P first pilot resources;

the method further comprises the following steps:

selecting at least one beamforming matrix from the beamforming matrices used on the P first pilot resources according to the information reported by the user equipment, so as to perform beamforming on a downlink signal sent to the user equipment by using the selected at least one beamforming matrix;

6. The method of claim 5, wherein the information reported by the UE is generated by the UE according to the measurement results on the P first pilot resources.

7. The method according to claim 6, wherein the measurement result is a reference signal received power and/or a reference signal received quality and/or a channel state information measurement value;

wherein the measurement reporting information includes:

8. The method according to any of claims 5 to 7, wherein the base station is further configured with at least one second pilot resource,

wherein the method further comprises:

9. A method for pilot measurement in a mimo system, comprising:

reporting after measuring on all or part of the ports of the at least one P port first pilot frequency resource;

reporting after the measurement is performed on all or part of the ports of the at least one P port first pilot resource, including:

sending the measurement report information to the base station;

10. The method according to claim 9, wherein the measurement result is a reference signal received power and/or a reference signal received quality and/or a channel state information measurement value;

wherein the measurement reporting information includes:

identification information of a port with the highest reference signal received power and/or reference signal received quality measurement value and/or channel state information; or

11. A method for pilot measurement in a mimo system, comprising:

respectively measuring P first pilot frequency resources configured by a base station, wherein P is an integer not less than 2; and

reporting after measuring on the P first pilot frequency resources;

reporting after the measurement is performed on the P first pilot frequency resources, including:

sending the measurement report information to the base station;

12. The method according to claim 11, wherein the measurement result is a reference signal received power and/or a reference signal received quality and/or a channel state information measurement value;

wherein the measurement reporting information includes:

13. A pilot transmitting apparatus in a mimo system, comprising:

a first pilot signal sending module, configured to send a beamformed pilot signal on the at least one P-port first pilot resource;

the device further comprises:

a first beamforming matrix selecting module, configured to select at least one beamforming matrix from beamforming matrices employed at each port of the P port first pilot resource according to information reported by the user equipment, so as to perform beamforming on a downlink signal sent to the user equipment by using the selected at least one beamforming matrix;

14. The apparatus of claim 13, wherein the information reported by the UE is generated by the UE according to measurement results on all or a portion of the at least one P-port first pilot signal.

15. The apparatus of claim 14, wherein the measurement result is a reference signal received power and/or a reference signal received quality and/or a channel state information measurement value;

wherein the measurement reporting information includes:

16. The apparatus of any of claims 13-15, wherein the base station is further configured with at least one second pilot resource,

wherein the apparatus further comprises:

17. A pilot transmitting apparatus in a mimo system, comprising:

the third beamforming module is used for beamforming pilot signals on P first pilot resources configured by the base station, wherein different beamforming matrixes are adopted on different first pilot resources, and P is an integer not less than 2; and

a third pilot signal sending module, configured to send the beamformed pilot signals on the P first pilot resources, respectively;

the device further comprises:

a second beamforming matrix selecting module, configured to select at least one beamforming matrix from the beamforming matrices used in the P first pilot resources according to the information reported by the user equipment, so as to perform beamforming on a downlink signal sent to the user equipment by using the selected at least one beamforming matrix;

18. The apparatus of claim 17, wherein the information reported by the ue is generated by the ue according to measurement results on the P first pilot resources.

19. The apparatus of claim 18, wherein the measurement result is a reference signal received power and/or a reference signal received quality and/or a channel state information measurement value;

wherein the measurement reporting information includes:

20. The apparatus of any of claims 17-19, wherein the base station is further configured with at least one second pilot resource,

wherein the apparatus further comprises:

21. A pilot measurement apparatus in a mimo system, comprising:

a first measurement reporting module, configured to report after performing measurement on all or part of the ports of the at least one P port first pilot resource;

the first measurement reporting module generates measurement reporting information according to measurement results on all or part of the ports of the at least one P port first pilot frequency resource; sending the measurement report information to the base station;

22. The apparatus of claim 21, wherein the measurement result is a reference signal received power and/or a reference signal received quality and/or a channel state information measurement value;

wherein the measurement reporting information includes:

23. A pilot measurement apparatus in a mimo system, comprising:

a second measurement reporting module, configured to report after performing measurement on the P first pilot resources;

the second measurement reporting module generates measurement reporting information according to the measurement results on the P first pilot frequency resources and sends the measurement reporting information to the base station;

24. The apparatus of claim 23, wherein the measurement result is a reference signal received power and/or a reference signal received quality and/or a channel state information measurement value;

wherein the measurement reporting information includes: