CN103178882A - Method and device for adjusting three dimensional (3D) multiple-input-multiple-output (MIMO) downward inclination angles and base station - Google Patents

Abstract

An embodiment of the invention provides a method and a device for adjusting 3D MIMO downward inclination angles and a base station. The method comprises the steps of dividing users into a plurality of user groups according to positions of users within an area covered by the base station and determining the antenna downward inclination angle corresponding to each of the user groups respectively for all user groups, thus, dynamic adjustment of antenna downward inclination angles in a cell can be achieved, at the same time when the cell user performance is improved, compared with respective determination of the antenna downward inclination angle for each of the users, the method has the advantages that the number of times for adjustment is reduced, and the system complexity can be reduced.

Description

A kind of 3D MIMO downdip adjusting method, device and base station

Technical field

The present invention relates to wireless communication field, relate in particular to a kind of three-dimensional multiple-input and multiple-output (3D MIMO, 3 Dimensions Multiple-Input-Multiple-Output) downdip adjusting method, device and base station.

Background technology

At Long Term Evolution (LTE, Long Term Evolution) in system, in order to make signal limitations in self cell coverage area, reduce simultaneously the interference to other co-frequency cells, making the downward-sloping certain angle of directional antenna beams figure is a kind of very effective method.This technology all can be brought the lifting of power system capacity to macrocellular or micro-cellular environment.Reasonably the angle of declination setting not only can improve quality and the capacity of system greatly, the base station can better be played a role, thereby better provide service for the wireless user.This technology has become the future communications standard, for example the part of LTE and senior Long Term Evolution (LTE-A, LTE-Advanced) standard.

3D MIMO technology can be controlled equivalent aerial waveform (being signal) on vertical direction effectively by base band signal process, is that future mobile communication system is effectively controlled the important means of disturbing and covering.Existing 3D MIMO antenna gain in the horizontal and vertical directions can be distinguished as depicted in figs. 1 and 2.The realization of 3D MIMO technology can have different algorithms, comprising 3D wave beam formation (Beamforming) technology and the simple equivalent angle of declination self adaptation adjustment technology of complexity.When equivalence angle of declination self adaptation adjustment technology refers on the specific frequency band/moment resource transmitted signal, by the mode of base band signal process, realize the self adaptation adjustment of equivalent vertical antenna pattern (pattern) (or beam direction) on current frequency band/moment.

But 3D MIMO technology is only applicable to the scene of following fixedly angle of declination at present: with respect to the 2DMIMO technology, in the horizontal direction, change its half-power beam width (HPBW), in vertical direction simultaneously, antenna array is shown the half-power beam width of an arrowband, and can by one fixedly angle of declination proofread and correct.

And in the application scenarios of fixing angle of declination, as shown in Figure 3, the main lobe of vertical antenna points to the position, somewhere on ground, residential quarter, and the vertical antenna gain of this position is maximum, and along with the expansion of distance to center of housing estate and edge, the vertical antenna gain will reduce gradually.Therefore, the poor-performing of center of housing estate and edge customer.

In order to strengthen the performance of center of housing estate and edge customer, in actual communication system, can be for each user, regulate angle of declination, although can make like this main lobe of vertical antenna point to this user, promote this user's performance, the complexity of system promotes excessive.

Summary of the invention

The embodiment of the present invention provides a kind of 3D MIMO downdip adjusting method, device and base station, is used for solving existing 3D MIMO technology and uses, in order to strengthen the performance of center of housing estate and edge customer, the problem that system complexity is higher.

A kind of 3D MIMO downdip adjusting method, described method comprises:

Determine the position at each user place in the coverage cell of base station;

According to each user's who determines position, described user is divided at least two user's groups;

For each user's group, determine that this user organizes corresponding angle of declination.

A kind of 3D MIMO angle of declination adjusting device, described device comprises:

Position determination unit be used for to be determined the position at each user place in the coverage cell of base station;

Grouped element is used for the position according to each user who determines, and described user is divided at least two user's groups;

The angle of declination determining unit is used for determining that for each user's group this user organizes corresponding angle of declination.

A kind of base station, this base station comprise described 3D MIMO angle of declination adjusting device.

The scheme that provides according to the embodiment of the present invention, in base station coverage area, the position at user place, the user is divided into a plurality of users group, determines respectively that for each user's group this user organizes corresponding Downtilt, realize dynamic adjustment at residential quarter internal antenna angle of declination with this, when improving the community user performance, with respect to determining respectively Downtilt for each user, can also reduce the adjustment number of times, thereby reduce system complexity.

Description of drawings

Fig. 1 is 3D MIMO horizontal direction antenna gain schematic diagram in prior art;

Fig. 2 is 3D MIMO vertical direction antenna gain schematic diagram in prior art;

Fig. 3 concerns schematic diagram for 3D MIMO angle of declination and the antenna gain that provides in prior art;

The 3D MIMO downdip adjusting method step schematic diagram of Fig. 4 for providing in the embodiment of the present invention one;

The 3D MIMO downdip adjusting method step schematic diagram of Fig. 5 for providing in the embodiment of the present invention two;

Fig. 6 organizes the division result schematic diagram for the user who provides in the embodiment of the present invention two;

The 3D MIMO angle of declination adjusting device structural representation of Fig. 7 for providing in the embodiment of the present invention three.

Embodiment

The present invention program is for the shortcoming of existing scheme, propose a kind of new scheme and improve 3D mimo system performance, its basic thought is: divide subregion (subcell) in the residential quarter, Dynamic Selection subregion angle of declination makes this zone user's main aerial gain can reach maximum.To find reasonable balance as prerequisite between systematic function and complexity, the dynamic adjustments angle of declination is completed the wave beam formation on a plurality of vertical direction in the residential quarter.The present invention program is applicable to the communication system relevant to the 3D mimo channel.

Below in conjunction with Figure of description and each embodiment, the present invention program is described.

Embodiment one,

The embodiment of the present invention one provides a kind of 3D MIMO downdip adjusting method, and the step of the method comprises as shown in Figure 4:

Step 101, determine the position at each user place in the coverage cell of base station.

Concrete, can receive the positional information of each reporting of user, thereby determine the position at each user place.

Step 102, divide into groups.

This step comprises, according to each user's who determines position, described user is divided at least two user's groups.

More excellent, in the time of can utilizing fixing angle of declination, the position of main lobe sensing place of vertical antenna and the distance between the base station as threshold value, are divided into groups to the user.Concrete, the position of main lobe sensing place of vertical antenna and the first distance between the base station in the time of can determining fixing angle of declination, and, determine the second distance between each user and base station, and can sort to the user according to the ascending order of second distance.

From first user of the rear acquisition of sorting, carry out successively following operation, until all users are divided to user's group:

Obtain after sorting, and be not divided to the user of user's group as reference user, from sorting after this reference user and not being divided to the user of user's group, determine and reference user between the 3rd distance less than the node users of described the first distance, reference user and each node users are divided into user's group, thereby realize the user that the geographical position comparatively approaches is divided into user's group.

More excellent, in the present embodiment, in the time of can also be take fixing angle of declination, the position of main lobe sensing place of vertical antenna be as the boundary, the user is divided into two user's groups, concrete, the position of main lobe sensing place of vertical antenna and the first distance between the base station in the time of can determining fixing angle of declination, will and the base station between second distance be divided into the first user group greater than the user of described the first distance, will and the base station between the second distance user that is not more than described the first distance be divided into second user's group.

Step 103, adjustment angle of declination.

This step comprises, for each user's group, determines that this user organizes corresponding angle of declination.

Concrete, can be for each user in this user's group, determine to make this user to obtain the sub-angle of declination of maximum antenna gain, respectively for each sub-angle of declination of determining, determine that this user organizes corresponding antenna gain summation, corresponding sub-angle of declination when the antenna gain summation is maximum is defined as this user and organizes corresponding angle of declination.

Wherein, can according to the distance between base station height, user's height and base station and user, determine to make this user to obtain the sub-angle of declination of maximum antenna gain.Concrete, can determine sub-angle of declination by following formula:

${\mathrm{\θ}}_{\mathrm{tilte}}=\arctan \left(\frac{h_{\mathrm{BS}}-h_{\mathrm{MS}}}{d}\right)$

Wherein:

θ _TilteRepresent the sub-angle of declination that this user is corresponding;

h _BSThe height of expression base station;

h _MSUser's height that expression is default;

D represents the distance between base station and this user.

The method that provides below by two pairs of embodiment of the present invention one of embodiment describes.Concrete, the position of main lobe sensing place of vertical antenna and the distance between the base station as threshold value, are grouped into example to the user and describe when utilizing fixing angle of declination.

Embodiment two,

The embodiment of the present invention 21 provides a kind of 3D MIMO downdip adjusting method, and the step of the method comprises as shown in Figure 5:

Step 201, determine each user's position.

Concrete, can according to the feedback information of each user in the coverage cell of base station, obtain user's positional information, for convenience of description with (UE _{Index, i}, UE _{Index, j}) positional information of recording user, wherein, index=1,2 ... n, i are the abscissa of user index positional information, and j is the ordinate of user index positional information.

Step 202, determine the distance between each user and base station.

In this step, can be according to the user's who obtains positional information, calculate the distance (being second distance) between user and base station, and according to the distance of distance, the user is sorted, for each user, can store sequence sequence number and the positional information of its correspondence, with n=10, be example according to ascending sequence of second distance, a kind of possible storage format is as shown in table 1:

The sequence sequence number

1

2

3

4

5

6

7

8

9

10

User ID

UE 1

UE 2

UE 4

UE 6

UE 7

UE 5

UE 3

UE l0

UE 8

UE 9

Abscissa

UE 1，i

UE 2，i

UE 4，i

UE 6，i

UE 7，i

UE 5，i

UE 3，i

UE l0，i

UE 8，i

UE 9，i

Ordinate

UE 1，j

UE 2，j

UE 4，j

UE 6，j

UE 7，j

UE 5，j

UE 3，j

UE l0，j

UE 8，j

UE 9，j

Table 1

Step 203, according to first the distance divide into groups.

In this step, in the time of can be with fixing angle of declination, the position of main lobe sensing place of vertical antenna and the first distance between the base station be divided into groups as threshold value.Concrete, can be according to customer location storage order in table 1, from the user that the sequence sequence number is 1, successively with the user in table 1 as reference user, if this reference user has been included in certain user organizes, skip this user, continue to seek next reference user; If this reference user is not included in certain user organizes, poll is arranged in this reference user back and is not divided to the user that the user organizes, if between the user who is polled to and reference user, distance (namely the 3rd apart from) is less than threshold value, itself and reference user are divided in a user organizes.

After all users were divided to user's group, grouping finished.The user organizes the division result can be as shown in Figure 6.

Step 204, for each user group, determine angle of declination.

in this step, for each user's group, can be according to the principle of the antenna gain maximum that makes the user, for each user, vertical angle (being sub-angle of declination) during this user is organized between each user and base station is according to the base station height, user height and both between the factors such as distance obtain, then use polling algorithm, respectively with the fixedly angle of declination of the angle that calculates in this user's group as this user's group, calculate user's antenna gain, can make this user organize the angle of all users' antenna gain summation maximum, namely can organize corresponding Downtilt as this user.

This method had both been selected angle of declination dynamically, again the angle of declination of some user's groups was fixed, and namely can find a rational balance between complexity and throughput of system.

The scheme that provides according to the embodiment of the present invention one and embodiment two, angle analysis from the user performance of considering simultaneously Cell Center User and Cell Edge User, can hang the self adaptation adjusting that high factor is carried out angle of declination according to customer location, cell size, antenna, the method can be when improving systematic function, reduce system complexity, find rational balance between both.

Based on same inventive concept, provide following device with the embodiment of the present invention one and embodiment two.

Embodiment three,

The embodiment of the present invention three provides a kind of 3D MIMO angle of declination adjusting device, and the structure of this device comprises as shown in Figure 7:

Position determination unit 11 is used for determining the position at each user place in the coverage cell of base station; The position that grouped element 12 is used for according to each user who determines is divided at least two user's groups with described user; Angle of declination determining unit 13 is used for determining that for each user's group this user organizes corresponding angle of declination.

The position of main lobe sensing place of vertical antenna and the first distance between the base station when described grouped element 12 specifically is used for definite fixedly angle of declination, will and the base station between second distance be divided into the first user group greater than the user of described the first distance, will and the base station between the second distance user that is not more than described the first distance be divided into second user's group.

The position of main lobe sensing place of vertical antenna and the first distance between the base station when described grouped element 12 specifically is used for definite fixedly angle of declination, and, determine the second distance between each user and base station, the order ascending according to second distance sorts to the user, from first user of the rear acquisition of sorting, carry out successively following operation, until all users are divided to user's group:

Obtain after sorting, and be not divided to the user of user's group as reference user, from sorting after this reference user and not being divided to the user of user's group, determine and reference user between the 3rd distance less than the node users of described the first distance, reference user and each node users are divided into user's group.

Concrete each user who is used for for this user's group of described angle of declination determining unit 13, determine to make this user to obtain the sub-angle of declination of maximum antenna gain, respectively for each sub-angle of declination of determining, determine that this user organizes corresponding antenna gain summation, corresponding sub-angle of declination when the antenna gain summation is maximum is defined as this user and organizes corresponding angle of declination.

Described angle of declination determining unit 13 is concrete for according to the distance between base station height, user's height and base station and user, determines to make this user to obtain the sub-angle of declination of maximum antenna gain.

Described angle of declination determining unit 13 is concrete for determining sub-angle of declination by following formula:

${\mathrm{\θ}}_{\mathrm{tilte}}=\arctan \left(\frac{h_{\mathrm{BS}}-h_{\mathrm{MS}}}{d}\right)$

Wherein:

θ _TilteRepresent the sub-angle of declination that this user is corresponding;

h _BSThe height of expression base station;

h _MSUser's height that expression is default;

D represents the distance between base station and this user.

Especially, the device that provides of the embodiment of the present invention three can be integrated in the base station.

Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of claim of the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.

Claims (13)

1. a three-dimensional multiple-input and multiple-output 3D MIMO downdip adjusting method, is characterized in that, described method comprises:

Determine the position at each user place in the coverage cell of base station;

According to each user's who determines position, described user is divided at least two user's groups;

For each user's group, determine that this user organizes corresponding angle of declination.

2. the method for claim 1, is characterized in that, according to each user's who determines position, described user is divided at least two user's groups, specifically comprises:

The position of main lobe sensing place of vertical antenna and the first distance between the base station during definite fixedly angle of declination;

Will and the base station between second distance be divided into the first user group greater than the user of described the first distance, will and the base station between the second distance user that is not more than described the first distance be divided into second user's group.

3. the method for claim 1, is characterized in that, according to each user's who determines position, described user is divided at least two user's groups, specifically comprises:

The position of main lobe sensing place of vertical antenna and the first distance between the base station during definite fixedly angle of declination; And, determine the second distance between each user and base station;

The order ascending according to second distance sorts to the user;

From first user of the rear acquisition of sorting, carry out successively following operation, until all users are divided to user's group:

Obtain after sorting, and be not divided to the user of user's group as reference user, from sorting after this reference user and not being divided to the user of user's group, determine and reference user between the 3rd distance less than the node users of described the first distance, reference user and each node users are divided into user's group.

4. described method as arbitrary in claim 1～3, is characterized in that, for each user's group, determines that this user organizes corresponding angle of declination, specifically comprises:

Each user in this user's group determines to make this user to obtain the sub-angle of declination of maximum antenna gain;

For each sub-angle of declination of determining, determine that this user organizes corresponding antenna gain summation respectively;

Corresponding sub-angle of declination when the antenna gain summation is maximum is defined as this user and organizes corresponding angle of declination.

5. method as claimed in claim 4, is characterized in that, each user in this user's group determines to make this user to obtain the sub-angle of declination of maximum antenna gain, specifically comprises:

According to the distance between base station height, user's height and base station and user, determine to make this user to obtain the sub-angle of declination of maximum antenna gain.

6. method as claimed in claim 5, is characterized in that, determines sub-angle of declination by following formula:

${\mathrm{\θ}}_{\mathrm{tilte}}=\arctan \left(\frac{h_{\mathrm{BS}}-h_{\mathrm{MS}}}{d}\right)$

Wherein:

θ _TilteRepresent the sub-angle of declination that this user is corresponding;

h _BSThe height of expression base station;

h _MSUser's height that expression is default;

D represents the distance between base station and this user.

7. a three-dimensional multiple-input and multiple-output 3D MIMO angle of declination adjusting device, is characterized in that, described device comprises:

Position determination unit be used for to be determined the position at each user place in the coverage cell of base station;

Grouped element is used for the position according to each user who determines, and described user is divided at least two user's groups;

The angle of declination determining unit is used for determining that for each user's group this user organizes corresponding angle of declination.

8. device as claimed in claim 7, it is characterized in that, described grouped element, the position of main lobe sensing place of vertical antenna and the first distance between the base station when specifically being used for definite fixedly angle of declination, will and the base station between second distance be divided into the first user group greater than the user of described the first distance, will and the base station between the second distance user that is not more than described the first distance be divided into second user's group.

9. device as claimed in claim 7, it is characterized in that, described grouped element, the position of main lobe sensing place of vertical antenna and the first distance between the base station when specifically being used for definite fixedly angle of declination, and, determine the second distance between each user and base station, the order ascending according to second distance sorts to the user, from first user of the rear acquisition of sorting, carry out successively following operation, until all users are divided to user's group:

Obtain after sorting, and be not divided to the user of user's group as reference user, from sorting after this reference user and not being divided to the user of user's group, determine and reference user between the 3rd distance less than the node users of described the first distance, reference user and each node users are divided into user's group.

10. device as claimed in claim 7, it is characterized in that, described angle of declination determining unit, concrete each user who is used for for this user's group, determine to make this user to obtain the sub-angle of declination of maximum antenna gain, respectively for each sub-angle of declination of determining, determine that this user organizes corresponding antenna gain summation, corresponding sub-angle of declination when the antenna gain summation is maximum is defined as this user and organizes corresponding angle of declination.

11. device as claimed in claim 10 is characterized in that, described angle of declination determining unit, and concrete being used for determines to make this user to obtain the sub-angle of declination of maximum antenna gain according to the distance between base station height, user's height and base station and user.

12. device as claimed in claim 11 is characterized in that, described angle of declination determining unit, and concrete being used for determined sub-angle of declination by following formula:

${\mathrm{\θ}}_{\mathrm{tilte}}=\arctan \left(\frac{h_{\mathrm{BS}}-h_{\mathrm{MS}}}{d}\right)$

Wherein:

θ _TilteRepresent the sub-angle of declination that this user is corresponding;

h _BSThe height of expression base station;

h _MSUser's height that expression is default;

D represents the distance between base station and this user.

13. a base station is characterized in that, described base station comprises described device as arbitrary in claim 7～12.

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