CN105228258A - A kind of data transmission method and base station - Google Patents

Abstract

The invention discloses a kind of data transmission method, base station (eNB) calculates the positional information of UE according to the channel information of terminal (UE); According to calculating the positional information obtained, UE is matched; Carry out scheduling of resource according to pairing result, and calculate the precoding vector of UE; Transfer of data is carried out according to the precoding vector that resource and the calculating of described scheduling obtain.The present invention also also discloses a kind of base station.

Description

A kind of data transmission method and base station

Technical field

The present invention relates to the data transmission technology of communication system, particularly relate to a kind of data transmission method and base station.

Background technology

Collaborative multicast communication and reception (CoordinatedMulti-Pointtransmission/reception, CoMP) technology is applied to senior Long Term Evolution (AdvancedLongTermEvolution, LTE-Advanced) during system, high-speed data can be provided to cover, increase the throughput of community.Simultaneously, because the precoding technique in CoMP system can realize beam forming and the AF panel function to system, therefore, by choosing the interference in suitable pre-coding matrix suppression CoMP system, and then the spectrum efficiency of system and the throughput of edge customer can be improved.

In three-dimensional (3Division, 3D) LTE system, base station adopts multi-antenna array to carry out transfer of data, and more number of antennas can improve the performance of LTE-Advanced system to a greater degree; 3D dualbeam LTE system is that the realization of CoMP provides more wide space, has vital effect to the total throughput of raising LTE-Advanced community user.

3D dualbeam LTE system can produce the wave beam that two differences vertically tie up angle of radiation simultaneously in space, two wave beams can serve same user simultaneously, be called 3D Combined Treatment (JointProcessing, JP) technology, in order to improve the performance of user; Two wave beams also can serve different users, are called that 3D works in coordination with wave beam forming (CoordinatedBeamforming, CB) technology, in order to increase the number of users of serving in community, improve the throughput of community.Above-mentioned service mode is considered to the CoMP between two wave beams, that is: base station is by the CoMP between 3DCB technology or the inside and outside wave beam of 3DJP technology realization.But the angular distribution interval that in 3D dualbeam LTE system, user is vertically tieing up is very little, easily produces interference to other users, causes the performance of 3D dualbeam LTE system sharply to decline.

Summary of the invention

In view of this, the embodiment of the present invention is expected to provide a kind of data transmission method and base station, can reduce the interference between the vertical user tieed up in 3D dualbeam LTE system, improve the performance of 3D dualbeam LTE system.

The technical scheme of the embodiment of the present invention is achieved in that

The embodiment of the present invention provides a kind of data transmission method, comprising: eNB calculates the positional information of UE according to the channel information of UE; According to calculating the positional information obtained, UE is matched; Carry out scheduling of resource according to pairing result, and calculate the precoding vector of UE; Transfer of data is carried out according to the precoding vector that resource and the calculating of described scheduling obtain.

Preferably, before eNB calculates the positional information of UE, described method also comprises: the channel information obtaining UE.

Preferably, the described positional information according to calculating acquisition is carried out pairing to UE and is comprised: according to calculating the positional information obtained, two UEs minimum to the degree of correlation match.

Preferably, describedly carry out scheduling of resource comprise according to pairing result:

Collaborative wave beam forming service mode is adopted to the UE of successful matching, Combined Treatment service mode is adopted to the unsuccessful UE of pairing;

First Resourse Distribute is carried out to the UE being in collaborative wave beam forming service mode, then Resourse Distribute is carried out to the UE being in Combined Treatment service mode;

When the Long Term Evolution LTE system capacity being in Combined Treatment service mode is greater than scheduling resource, relatively be in the LTE system capacity of Combined Treatment service mode and be in the LTE system capacity of collaborative wave beam forming service mode, Resourse Distribute is carried out to the UE being in LTE system service mode capacious.

Preferably, the precoding vector of described calculating UE comprises: according to leakage signal noise ratio and the dry precoding vector calculating UE than maximum principle of letter.

The embodiment of the present invention also provides a kind of base station, comprising: computing module, matching module, processing module and transport module; Wherein,

Described computing module, for calculating the positional information of UE according to the channel information of UE;

Described matching module, matches to UE for calculating according to computing module the positional information obtained;

Described processing module, carries out scheduling of resource for the pairing result according to matching module, and calculates the precoding vector of UE;

Described transport module, carries out transfer of data for the precoding vector obtained according to resource and the calculating of described scheduling.

Preferably, described base station also comprises: acquisition module, for obtaining the channel information of UE.

Preferably, described matching module calculates according to computing module the positional information obtained and carries out pairing to UE and comprise: according to calculating the positional information obtained, two UEs minimum to the degree of correlation match.

Preferably, described processing module is carried out scheduling of resource comprise according to pairing result:

Collaborative wave beam forming service mode is adopted to the UE of successful matching, Combined Treatment service mode is adopted to the unsuccessful UE of pairing;

First Resourse Distribute is carried out to the UE being in collaborative wave beam forming service mode, then Resourse Distribute is carried out to the UE being in Combined Treatment service mode;

When the LTE system capacity being in Combined Treatment service mode is greater than scheduling resource, relatively be in the LTE system capacity of Combined Treatment service mode and be in the LTE system capacity of collaborative wave beam forming service mode, Resourse Distribute is carried out to the UE being in LTE system service mode capacious.

Preferably, processing module is according to leakage signal noise ratio and the dry precoding vector calculating UE than maximum principle of letter.

The data transmission method that the embodiment of the present invention provides and base station, eNB first calculates the positional information of UE according to the channel information of UE, then matches to UE according to calculating the positional information obtained; Then carry out scheduling of resource according to pairing result, and calculate the precoding vector of UE; The precoding vector finally obtained according to resource and the calculating of described scheduling carries out transfer of data.Positional information according to UE is matched to UE, carries out scheduling of resource, can reduce the interference power between UE according to pairing result; By carrying out scheduling of resource according to pairing result, not only increasing the performance of low signal-to-noise ratio UE in system, and adding the fairness of system.

Accompanying drawing explanation

Fig. 1 is the basic handling schematic flow sheet of embodiment of the present invention data transmission method;

Fig. 2 is the SINR distribution schematic diagram that the embodiment of the present invention is in the UE of different service modes;

Fig. 3 is the antenna configuration schematic diagram of eNB under embodiment of the present invention 3D dualbeam scene;

Fig. 4 is the wave beam schematic diagram that embodiment of the present invention eNB produces;

Fig. 5 is the detailed process schematic diagram of embodiment of the present invention data transmission method;

Fig. 6 is embodiment of the present invention UE pairing region schematic diagram;

Fig. 7 is the 3D dualbeam LTE system crossover region capacity schematic diagram that the embodiment of the present invention is in different service modes;

Fig. 8 is the composition structural representation of embodiment of the present invention base station.

Embodiment

In the embodiment of the present invention, eNB first calculates the positional information of UE according to the channel information of UE, according to calculating the positional information obtained, UE is matched again, then scheduling of resource is carried out according to pairing result, and calculating the precoding vector of UE, the precoding vector finally obtained according to resource and the calculating of described scheduling carries out transfer of data.

In the embodiment of the present invention, under 3D dualbeam scene, the basic handling flow process of data transmission method as shown in Figure 1, comprises the following steps:

Step 101, eNB calculates the positional information of UE according to the channel information of UE;

Wherein, described channel information comprises: the angle information between the intensity of 3D reference signal and UE and eNB;

Particularly, eNB first according to the distance of Strength co-mputation UE to the eNB of 3D reference signal, then determines the positional information of UE according to the angle between Distance geometry UE and the eNB between UE and eNB.

Step 102, matches to UE according to calculating the positional information obtained;

Here, eNB matches to two UE that the degree of correlation is minimum according to calculating the positional information obtained;

Particularly, eNB is according to calculating the positional information obtained, and according to UE to eNB apart from ascending order arrangement UE, two UEs minimum to the degree of correlation match, and namely match to two UE of lie farthest away between UE; When the hydraulic performance decline of UE reaches maximum number of pairs to certain signal-noise ratio threshold or UE quantity, eNB stops matching to UE;

Wherein, described certain signal-noise ratio threshold is relevant with the noise condition of CoMP system, and described maximum number of pairs can set as required flexibly.

Step 103, carries out scheduling of resource according to pairing result, and calculates the precoding vector of UE;

Particularly, adopt CB service mode to the UE of successful matching, the UE unsuccessful to pairing adopts JP service mode;

Because the UE being in CB service mode can be subject to the strong interference of another wave beam outside its served beams, cause the UE Signal to Interference plus Noise Ratio (SignaltoInterferenceplusNoiseRatio being in CB service mode, SINR) low, and the UE being in JP service mode does not exist the interference problem between this cells beam, so the SINR being in the UE of JP service mode is high.Be in the UE of independent JP service mode, be in the UE of independent CB service mode and by embodiment of the present invention data transmission method obtain be in JP service mode and CB service mode mixing UE SINR distribution map as shown in Figure 2, dotted line represents the SINR distribution curve of the UE being in JP service mode, chain-dotted line represents the SINR distribution curve of the UE being in CB service mode, and solid line represents the SINR distribution curve of the UE being in JP service mode and the mixing of CB service mode; Can find out, be in the UE of JP service mode SINR distribution the highest, be in the UE of CB service mode SINR distribution minimum, be in JP service mode and CB service mode mixing UE SINR distribution be in before between the two.

Therefore, when scheduling of resource, first Resourse Distribute is carried out to the UE being in CB service mode, then according to Proportional Fair criterion, Resourse Distribute is carried out to the UE being in JP service mode;

When the LTE system capacity being in JC service mode is greater than scheduling resource, compares the LTE system capacity being in JC service mode and the LTE system capacity being in CB service mode, Resourse Distribute is carried out to the UE being in LTE system service mode capacious.

When calculating is in the precoding vector of the UE of CB service mode, if the channel information that the precoding vector of user is the served beams of w, UE is H, then the leakage signal noise ratio (SignaltoLeakageandNoiseRadio, SLNR) of UE is: (1);

Wherein, N ₀represent the noise power of UE, H ₁represent the channel information of pairing UE; Now, the SLNR pre-coding matrix of UE optimum is:

$\begin{array}{c}{W}_{\mathrm{opt}}=\arg \max \mathrm{SLNR}=\arg \max \frac{{\left|\right|\mathrm{Hw}\left|\right|}^2}{N_0+{\left|\right|H_1\left|w\right|}^2}\\ =\max \mathrm{eigenvector}\left({(N_{0}I+H_1^H{H}_1)}^{-1}{H}_1^H{H}_1\right)\end{array}---\left(2\right);$

Wherein, represent channel matrix H ₁conjugate matrices.

When calculating is in the precoding vector of the UE of JP service mode, because inside and outside two beams serves are in same UE, therefore, between inside and outside two wave beams, there is not the interference between UE, only need calculate the optimum precoding vectors of two wave beams of UE respectively; If the channel information that the precoding vector of user is the served beams of w, UE is H, the precoding vector being in the UE optimum of JP service mode is:

W _opt＝argmax||Hw|| ²(3)。

Step 104, carries out transfer of data according to the precoding vector that resource and the calculating of described scheduling obtain;

Here, how eNB carries out transfer of data according to the resource of described scheduling and the precoding vector of calculating acquisition belongs to prior art, repeats no more here.

Before execution step 101, described method also comprises: eNB obtains the channel information of UE;

Particularly, eNB can the channel information of active obtaining UE, also can receive the channel information that UE initiatively sends.

In the embodiment of the present invention, under 3D dualbeam scene, the antenna configuration schematic diagram of eNB as shown in Figure 3, and the array antenna of eNB is divided into upper and lower two groups, and upper group of antenna is for generation of outer wave beam, and lower group antenna is for generation of interior wave beam; As shown in Figure 4, the detailed process of the present embodiment data transmission method as shown in Figure 5, comprises the following steps the wave beam schematic diagram that eNB produces:

Step 201, UE sends the channel information of self to eNB;

Here, UE obtains the channel information of self by the pilot signal that measurement eNB issues;

Wherein, described channel information comprises: the angle information between the intensity of 3D reference signal and UE and eNB.

Step 202, eNB calculates the positional information of UE according to the channel information of the UE received;

Wherein, described positional information comprises: the range information between UE and eNB and the angle between UE and eNB; Described positional information comprises: the range information between UE and eNB and the angle between UE and eNB;

Particularly, after eNB calculates the positional information of UE, the order ascending according to the distance between UE and eNB sorts to UE;

How eNB belongs to prior art according to the positional information of the channel information calculating UE of UE, repeats no more here.

Step 203, eNB matches to UE according to calculating the positional information obtained;

Particularly, if the distance of UE to eNB is d, two distance threshold are respectively d1 and d2, and d1 < d2; LTE microzonation is divided into the inner ring of area equation, crossover region, outer ring three part, outer ring UE is by outer beams serves, and inner ring UE is by interior beams serves; Under statistical significance, be in the inner ring UE within the scope of d < d1, be in the outer ring UE within the scope of d > d2 and be in the number of the crossover region UE within the scope of d1 < d < d2 all equal;

Here, only match to inner ring UE and outer ring UE, inner ring UE as shown in Figure 6, is divided into A and B two regions by UE pairing region schematic diagram, and outer ring UE is divided into C and D two regions; For enabling each UE realize maximum isolation, two UEs minimum to the degree of correlation match, that is: matched by the UE in UE and the D region in a-quadrant, and the UE in UE and the C region in B region matches; When not having unpaired inner ring UE or do not have unpaired outer ring UE or UE number to reach maximum number of pairs, eNB terminates the pairing to UE; Wherein, maximum number of pairs can be arranged as required flexibly.

Step 204, eNB carries out scheduling of resource according to pairing result, and calculates the precoding vector of UE;

Particularly, adopt CB service mode to the UE of successful matching, the UE unsuccessful to pairing adopts JP service mode; Because the UE being in CB service mode can be subject to the strong interference of another wave beam outside its served beams, cause the UE signal to noise ratio being in CB service mode low, and the UE being in JP service mode does not exist the interference problem between this cells beam, so the UE signal to noise ratio being in JP service mode is high; When scheduling of resource, first Resourse Distribute is carried out to the UE being in CB service mode, then according to Proportional Fair criterion, Resourse Distribute is carried out to the UE being in JP service mode;

When the UE capacity being in JC service mode is greater than scheduling resource, compares the UE capacity being in JC service mode and the UE capacity being in CB service mode, Resourse Distribute is carried out to the UE being in UE service mode capacious;

Wherein, how Resourse Distribute is carried out to UE and belong to prior art, repeat no more here.

When calculating is in the precoding vector of the UE of CB service mode, if the channel information that the precoding vector of user is the served beams of w, UE is H, then the leakage signal noise ratio (signaltoleakageandnoiseradio, SLNR) of UE is: (1);

Wherein, N ₀represent the noise power of UE, H ₁represent the channel information of pairing UE; Now, the SLNR pre-coding matrix of UE optimum is:

$\begin{array}{c}{W}_{\mathrm{opt}}=\arg \max \mathrm{SLNR}=\arg \max \frac{{\left|\right|\mathrm{Hw}\left|\right|}^2}{N_0+{\left|\right|H_1\left|w\right|}^2}\\ =\max \mathrm{eigenvector}\left({(N_{0}I+H_1^H{H}_1)}^{-1}{H}_1^H{H}_1\right)\end{array}---\left(2\right);$

Wherein, represent channel matrix H ₁conjugate matrices.

When calculating is in the precoding vector of the UE of JP service mode, because inside and outside two beams serves are in same UE, therefore, between inside and outside two wave beams, there is not the interference between UE, only need calculate the optimum precoding vectors of two wave beams of UE respectively; If the channel information that the precoding vector of user is the served beams of w, UE is H, the precoding vector being in the UE optimum of JP service mode is:

W _opt＝argmax||Hw|| ²(3)。

Step 205, carries out transfer of data according to the precoding vector that resource and the calculating of described scheduling obtain.

The 3D dualbeam LTE system crossover region capacity being in JP service mode and the mixing of CB service mode obtained by embodiment of the present invention data transmission method be in independent JP service mode, be in the 3D dualbeam LTE system crossover region capacity schematic diagram of independent CB service mode, as shown in Figure 7, dotted line represents the system crossover region capacity distribution curve being in JP service mode, chain-dotted line represents the system crossover region capacity distribution curve being in CB service mode, and solid line represents the system crossover region capacity distribution curve being in JP service mode and the mixing of CB service mode; Can find out, the system crossover region capacity being in JP service mode is greater than the system crossover region capacity being in JP service mode and the mixing of CB service mode, therefore, the UE throughput being in JP service mode is less than the UE throughput being in JP service mode and the mixing of CB service mode.

For realizing above-mentioned data transmission method, the embodiment of the present invention additionally provides a kind of base station, and the composition structure of described base station as shown in Figure 8, comprising: computing module 11, matching module 12, processing module 13 and transport module 14; Wherein,

Described computing module 11, for calculating the positional information of UE according to the channel information of UE;

Described matching module 12, matches to UE for calculating according to computing module 11 positional information obtained;

Described processing module 13, carries out scheduling of resource for the pairing result according to matching module 12, and calculates the precoding vector of UE;

Described transport module 14, carries out transfer of data for the precoding vector obtained according to resource and the calculating of described scheduling.

Further, described base station also comprises: acquisition module 15, for obtaining the channel information of UE;

Wherein, described channel information comprises: the angle information between the intensity of 3D reference signal and UE and eNB.

Further, described matching module 12 couples of UE carry out pairing and comprise: according to calculating the positional information obtained, two UEs minimum to the degree of correlation match.

Further, described processing module 13 is carried out scheduling of resource according to pairing result and is comprised: adopt CB service mode to the UE of successful matching, adopts JP service mode to the unsuccessful UE of pairing;

First Resourse Distribute is carried out to the UE being in CB service mode, then Resourse Distribute is carried out to the UE being in JP service mode;

When the LTE system capacity being in Combined Treatment service mode is greater than scheduling resource, compares the LTE system capacity being in JP service mode and the LTE system capacity being in CB service mode, Resourse Distribute is carried out to the UE being in LTE system service mode capacious.

Further, the precoding vector that described processing module 13 calculates UE comprises: processing module 13 is according to leakage signal noise ratio and the dry precoding vector calculating UE than maximum principle of letter.

It should be noted that, in actual applications, the function of described computing module 11, matching module 12, processing module 13, transport module 14 and acquisition module 15 can be realized by the central processing unit be positioned on base station (CPU) or microprocessor (MPU) or digital signal processor (DSP) or programmable gate array (FPGA).

The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.

Claims (10)

1. a data transmission method, is characterized in that, described method comprises:

Base station eNB calculates the positional information of UE according to the channel information of terminal UE;

According to calculating the positional information obtained, UE is matched;

Carry out scheduling of resource according to pairing result, and calculate the precoding vector of UE;

Transfer of data is carried out according to the precoding vector that resource and the calculating of described scheduling obtain.

2. data transmission method according to claim 1, is characterized in that, before eNB calculates the positional information of UE, described method also comprises: the channel information obtaining UE.

3. data transmission method according to claim 1, is characterized in that, describedly carries out pairing to UE comprise according to calculating the positional information obtained: according to calculating the positional information obtained, two UEs minimum to the degree of correlation match.

4. data transmission method according to claim 1, is characterized in that, describedly carries out scheduling of resource according to pairing result and comprises:

Collaborative wave beam forming service mode is adopted to the UE of successful matching, Combined Treatment service mode is adopted to the unsuccessful UE of pairing;

First Resourse Distribute is carried out to the UE being in collaborative wave beam forming service mode, then Resourse Distribute is carried out to the UE being in Combined Treatment service mode;

When the Long Term Evolution LTE system capacity being in Combined Treatment service mode is greater than scheduling resource, relatively be in the LTE system capacity of Combined Treatment service mode and be in the LTE system capacity of collaborative wave beam forming service mode, Resourse Distribute is carried out to the UE being in LTE system service mode capacious.

5. data transmission method according to claim 1, is characterized in that, the precoding vector of described calculating UE comprises: according to leakage signal noise ratio and the dry precoding vector calculating UE than maximum principle of letter.

6. a base station, is characterized in that, described base station comprises: computing module, matching module, processing module and transport module; Wherein,

Described computing module, for calculating the positional information of UE according to the channel information of UE;

Described matching module, matches to UE for calculating according to computing module the positional information obtained;

Described processing module, carries out scheduling of resource for the pairing result according to matching module, and calculates the precoding vector of UE;

Described transport module, carries out transfer of data for the precoding vector obtained according to resource and the calculating of described scheduling.

7. base station according to claim 6, it is characterized in that, described base station also comprises: acquisition module, for obtaining the channel information of UE.

8. base station according to claim 6, is characterized in that, described matching module calculates according to computing module the positional information obtained and carries out pairing to UE and comprise: according to calculating the positional information obtained, two UEs minimum to the degree of correlation match.

9. base station according to claim 6, is characterized in that, described processing module is carried out scheduling of resource according to pairing result and comprised:

Collaborative wave beam forming service mode is adopted to the UE of successful matching, Combined Treatment service mode is adopted to the unsuccessful UE of pairing;

First Resourse Distribute is carried out to the UE being in collaborative wave beam forming service mode, then Resourse Distribute is carried out to the UE being in Combined Treatment service mode;

When the LTE system capacity being in Combined Treatment service mode is greater than scheduling resource, relatively be in the LTE system capacity of Combined Treatment service mode and be in the LTE system capacity of collaborative wave beam forming service mode, Resourse Distribute is carried out to the UE being in LTE system service mode capacious.

10. base station according to claim 6, is characterized in that, the precoding vector that described processing module calculates UE comprises: processing module is according to leakage signal noise ratio and the dry precoding vector calculating UE than maximum principle of letter.