CN101599813A - Switching method and device - Google Patents

Abstract

The invention discloses a kind of switching method and device, this method comprises: determine that the user gathers, user set comprises that signal to noise ratio under the base station is higher than a plurality of users of the snr threshold that sets in advance; All users in user's set are matched in twos, obtain first user pair set; Determine the characteristic of channel index that each user is right in first user pair set, and the selective channel performance index to satisfy the reference user of predetermined condition right; According to each with reference to the right user of user group and and characteristic of channel index, in a predefined manner from reference user centering select the user to and form second user pair set, wherein, the user in second user pair set is not to comprising same subscriber each other; According to space diversity spectrum efficiency and the spatial reuse spectrum efficiency that each user is right in second user pair set, determine the mode of operation of each user in second user pair set.By the present invention, improved the transmission rate gain of data, the maximized limited system bandwidth of having utilized.

Description

Switching method and device

Technical field

The present invention relates to the communications field, relate in particular to a kind of switching method and device.

Background technology

Multiple-input and multiple-output (Multiple-Input Multiple-Out-put, abbreviating MIMO as) technology is an important breakthrough of intelligent antenna technology in the wireless mobile communications field, this technology can improve the capability of communication system and the availability of frequency spectrum exponentially under the situation that does not increase bandwidth, can also utilize multipath to alleviate multipath fading, and can eliminate channel disturbance effectively, improving the reliability of channel, reduce the error rate, is the key technology that the third generation mobile communication system adopts.

The essence of MIMO technology is space diversity and spatial reuse, and space diversity and spatial reuse respectively have unique advantage.Wherein, space diversity is mainly passed through diversity gain (that is, snr gain) and is realized,, utilize space diversity can improve coverage, the error rate certain in coverage, the user requires under certain situation, and diversity gain can improve message transmission rate; Spatial reuse is mainly realized by spatial multiplexing gain (that is, spectral efficiency gain), can promote spectrum efficiency by spatial reuse, can also improve the transmission rate of data.Under the situation of wireless channel real-time change, some constantly usage space diversity can realize bigger message transmission rate, and usage space is multiplexing constantly can realize higher data rate at some.

As can be seen, usage space diversity technique or space multiplexing technique all can not be used limited frequency band substantially separately, and maximized raising message transmission rate.

Summary of the invention

Consider that independent usage space diversity technique or space multiplexing technique in the correlation technique all can not use the problem of limited frequency band substantially and propose the present invention, for this reason, main purpose of the present invention is to provide a kind of switching method and device, to address the above problem.

According to an aspect of the present invention, provide a kind of switching method.

Switching method according to the embodiment of the invention comprises: determine that the user gathers, wherein, user set comprises that signal to noise ratio under the base station is higher than a plurality of users of the snr threshold that sets in advance; All users in user's set are matched in twos, obtain first user pair set; Determine the characteristic of channel index that each user is right in first user pair set, and the selective channel performance index to satisfy the reference user of predetermined condition right; According to each with reference to the right user of user group and and characteristic of channel index, in a predefined manner from reference user centering select the user to and form second user pair set, wherein, the user in second user pair set is not to comprising same subscriber each other; According to space diversity spectrum efficiency and the spatial reuse spectrum efficiency that each user is right in second user pair set, determine the mode of operation of each user in second user pair set.

One of below wherein, characteristic of channel index specifically comprises at least: the conditional number that the user is right, the determinant that the user is right.

Preferably, the right operation of selecting to satisfy predetermined condition according to the right conditional number of user of reference user is specially: the user that the right conditional number of selection user is less than or equal to the first predetermined channel performance index threshold value is right with reference to the user to conduct.

Preferably, the operation of determining the conditional number that the user is right is specially: utilize the pairing channel coefficients of two users of user's centering to form channel matrix, wherein, the channel coefficients of user's same antenna is positioned at the same row of matrix, by the singular value of channel matrix, determine the conditional number that the user is right.

Preferably, utilize the pairing channel coefficients of two users of user's centering to form channel matrix, by the singular value of channel matrix, determine that the operation of the conditional number that the user is right is specially: two pairing channel coefficients of user of the described user's centering of base station measurement are h ₁₁, h ₂₁..., h _N1, h ₁₂, h ₂₂..., h _N2..., h _1m..., h _Nm, wherein, n is the antenna number of described base station; Determine that the channel matrix that the pairing channel coefficients of described two users is formed is $H=\left[\begin{array}{cccc}{h}_{11}& h_{12}& \·\·\·& h_{1m}\\ \·& \·& \·& \·\\ \·& \·& \·& \·\\ \·& \·& \·& \·\\ h_{n1}& h_{n2}& \·\·\·& h_{\mathrm{nm}}\end{array}\right];$ Determine the maximum and the minimum value of described channel matrix singular value; Determine that the right conditional number of described user is

Wherein, λ ₁Be described maximum, λ ₃Be described minimum value, perhaps, λ ₂Be described maximum, λ ₁Be described minimum value.

Preferably, the right operation of selecting to satisfy predetermined condition according to the right matrix determinant of user of user is specially: select the right determinant of user right with reference to the user to conduct more than or equal to the user of the second predetermined channel performance index threshold value.

Preferably, the operation of determining the determinant that the user is right is specially: equal at the internal user's of user antenna amount under the situation of antenna amount of base station, utilize the pairing channel coefficients of two users of user's centering to form channel matrix, determine the determinant that the user is right.

Preferably, utilize the pairing channel coefficients of two users of user's centering to form channel matrix, determine that the operation of the determinant that the user is right is specially: determine that two pairing channel coefficients of user of described user's centering are respectively h ₁₁..., h _N1..., h _1n..., h _NnDetermine that the channel matrix that the pairing channel coefficients of described two users is formed is $H=\left[\begin{array}{ccc}{h}_{11}& \·\·\·& h_{1n}\\ \·& & \·\\ \·& \·\·\·& \·\\ \·& & \·\\ h_{n1}& \·\·\·& h_{\mathrm{nn}}\end{array}\right];$ Determine the value of the determinant that the user is right.

Preferably, the right processing of user that select to form second user pair set is specially: the user of the predetermined reference user centering selective channel performance index optimum that satisfies condition to right as current optimal user; From reference user centering remove current optimal user to and right with current optimal user to relevant user, and the reference user centering after removing selects current optimal user right, until the user of reference user centering to all being removed, wherein, relevantly be meant that two users are to having an identical user; Utilize the whole current optimal user of selecting to forming second user pair set.

Preferably, determine that the operation of each user's mode of operation in second user pair set is specially:, compare the size of its space diversity spectrum efficiency and its spatial reuse spectrum efficiency for each user in second user pair set; Under the situation of space diversity spectrum efficiency greater than the spatial reuse spectrum efficiency relatively, two users that determine this user's centering adopt the mode of operation of space diversity; Otherwise two users that determine this user's centering unite the mode of operation that adopts spatial reuse.

Preferably, the operation of determining the space diversity spectrum efficiency that each user is right is specially: right for each user in second user pair set, determine its two users that comprise first signal to noise ratio and second signal to noise ratio of correspondence under the space diversity mode of operation respectively, and obtain corresponding first modulation coding mode and second modulation coding mode according to first signal to noise ratio and second signal to noise ratio; Obtain the right space diversity spectrum efficiency of this user according to first modulation coding mode and second modulation coding mode.

Wherein, the operation of determining the spatial reuse spectrum efficiency that each user is right is specially: determine two users corresponding the 3rd signal to noise ratio and the 4th signal to noise ratio of difference under the spatial reuse mode of operation of user's centering, and obtain two users corresponding respectively the 3rd modulation coding mode and the 4th modulation coding modes according to the 3rd signal to noise ratio and the 4th signal to noise ratio; Obtain the right spatial reuse spectrum efficiency of user according to the 3rd modulation coding mode and the 4th modulation coding mode.

Preferably, with the user in second user pair set under the base station to user's mode of operation be configured to the mode of operation of space diversity.

According to a further aspect in the invention, provide a kind of switching implement device.

Switching implement device according to an embodiment of the invention comprises: first determination module, be used for determining user's set, and wherein, user's set comprises that signal to noise ratio under the base station is higher than a plurality of users of the snr threshold that sets in advance; First matching module is used for all users of user's set are matched in twos, obtains first user pair set; Second determination module is used for determining the right characteristic of channel index of each user of first user pair set, and the selective channel performance index to satisfy the reference user of predetermined condition right; Second matching module, be used for according to each with reference to the right user of user group and and characteristic of channel index, in a predefined manner from reference user centering select the user to and form second user pair set, wherein, the user in second user pair set is not to comprising same subscriber each other; Processing module is used for space diversity spectrum efficiency and the spatial reuse spectrum efficiency right according to each user of second user pair set, determines the mode of operation of each user in second user pair set.

By above-mentioned at least one technical scheme of the present invention, space diversity and spatial reuse are used in combination, make between diversity reception and spatial reuse, switching of system self-adaption, improved the transmission rate gain of data.

Description of drawings

Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:

Fig. 1 is the flow chart according to the switching method of the inventive method embodiment;

Fig. 2 is the virtual MIMO system schematic diagram according to the embodiment of the invention;

Fig. 3 is the detailed process flow chart according to the switching method of the inventive method embodiment;

Fig. 4 is the schematic diagram according to the switching implement device of apparatus of the present invention embodiment.

Embodiment

Describe the present invention in detail below in conjunction with accompanying drawing.

In embodiments of the present invention, require user's number to be at least two, and each receiving terminal BS disposes two reception antennas at least, basic thought of the present invention is: the requirement based on system judges whether and need match to the user, when needs match to the user, select the user's set that is not less than the lowest signal-to-noise threshold value P1 that sets in advance according to user's signal to noise ratio, for example, the value of P1 can be between 0～25dB; In user's set of satisfying the signal to noise ratio requirement, all users are made up, it is right that per two users form a user, it is right to form one or several users, and judge that the pairing channel condition of the right aggregate channel of each user satisfies predetermined characteristic of channel index, if satisfy condition, think that then this user is to having the possibility of pairing, for example, the value of P2 can be between 0～1, and it is right to pick out all users that satisfy condition, and it is right to determine the best user of the channel condition of aggregate channel, join in the successfully pairing set, determine user pair set with this method; For the user who the does not have pairing still working method of usage space diversity; Select suitable mode transfer data for the user in the user pair set,, then, otherwise still use original antenna transmission mode according to the high mode transfer of spectrum efficiency efficiency of selection of transmission data under two kinds of patterns if there is the demand of mode switch in system.

Method embodiment

According to the embodiment of the invention, provide a kind of switching method.

Fig. 1 is the flow chart according to the switching method of the embodiment of the invention, and as shown in Figure 1, this method may further comprise the steps:

Step S102 determines that the user gathers, and wherein, user set comprises that signal to noise ratio under the base station is higher than a plurality of users of the snr threshold that sets in advance;

Step S104 matches all users in user's set in twos, obtains first user pair set;

Step S106 determines the characteristic of channel index that each user is right in first user pair set, and the selective channel performance index to satisfy the reference user of predetermined condition right;

Step S108, according to each with reference to the right user of user group and and characteristic of channel index, in a predefined manner from reference user centering select the user to and form second user pair set, wherein, the user in second user pair set is not to comprising same subscriber each other;

Step S110 according to space diversity spectrum efficiency and the spatial reuse spectrum efficiency that each user is right in second user pair set, determines the mode of operation of each user in second user pair set.

Technical scheme by the embodiment of the invention provides is used in combination space diversity and spatial reuse, makes switching between diversity reception and spatial reuse of system self-adaption, has improved the transmission speed of data and the efficiency of operation of system.

One of below wherein, the characteristic of channel index among the step S106 specifically comprises at least: the conditional number that the user is right, the determinant that the user is right.

And, in step S106, the right operation of selecting to satisfy predetermined condition according to the right conditional number of user of reference user is specially: the user that the right conditional number of selection user is less than or equal to the first predetermined channel performance index threshold value is right with reference to the user to conduct, wherein, the operation of determining the conditional number that the user is right is specially: utilize the pairing channel coefficients of two users of user's centering to form channel matrix, wherein, the channel coefficients of user's same antenna is positioned at the same row of matrix, by the singular value of channel matrix, determine the conditional number that the user is right.

Wherein, the operation of determining the conditional number that the user is right is specially: two pairing channel coefficients of user of base station measurement user centering are h ₁₁, h ₂₁..., h _N1, h ₁₂, h ₂₂..., h _N2..., h _1m..., h _Nm, wherein, n is the antenna number of base station, m is user's a antenna number; Determine that the channel matrix that two pairing channel coefficients of user are formed is $H=\left[\begin{array}{cccc}{h}_{11}& h_{12}& \·\·\·& h_{1m}\\ \·& \·& \·& \·\\ \·& \·& \·& \·\\ \·& \·& \·& \·\\ h_{n1}& h_{n2}& \·\·\·& h_{\mathrm{nm}}\end{array}\right];$ Determine the maximum and the minimum value of described channel matrix singular value; Determine that the right conditional number of described user is

Wherein, λ ₁Be described maximum, λ ₂Be described minimum value, perhaps, λ ₂Be described maximum, λ ₁Be described minimum value.

In addition, in step S106, it is right to select to satisfy the user of predetermined condition according to the right matrix determinant of user, and concrete operations are: select the right determinant of user more than or equal to the user of the second predetermined channel performance index threshold value to as right with reference to the user.

And, in step S106, the operation of determining the determinant that the user is right is specially: equal at the internal user's of user antenna amount under the situation of antenna amount of base station, utilize the pairing channel coefficients of two users of user's centering to form channel matrix, determine the determinant that the user is right, wherein, the operation of determining the determinant that the user is right is specially: determine that two pairing channel coefficients of user of user's centering are respectively h ₁₁..., h _N1..., h _1n..., h _NnDetermine that the channel matrix that two pairing channel coefficients of user are formed is $H=\left[\begin{array}{ccc}{h}_{11}& \·\·\·& h_{1n}\\ \·& & \·\\ \·& \·\·\·& \·\\ \·& & \·\\ h_{n1}& \·\·\·& h_{\mathrm{nn}}\end{array}\right]$ Wherein, n is the antenna number of base station, and n also is two users' an antenna number summation; Determine the value of the determinant that the user is right.

Preferably, in step S108, the right processing of user that select to form second user pair set is specially: the user of the predetermined reference user centering selective channel performance index optimum that satisfies condition to right as current optimal user; From reference user centering remove current optimal user to and right with current optimal user to relevant user, and the reference user centering after removing selects current optimal user right, until the user of reference user centering to all being removed, wherein, relevantly be meant that two users are to having an identical user; Utilize the whole current optimal user of selecting to forming second user pair set.

Preferably, in step S110, determine that the operation of each user's mode of operation in second user pair set is specially:, compare the size of its space diversity spectrum efficiency and its spatial reuse spectrum efficiency for each user in second user pair set; Under the situation of space diversity spectrum efficiency greater than the spatial reuse spectrum efficiency relatively, two users that determine this user's centering adopt the mode of operation of space diversity; Otherwise two users that determine this user's centering unite the mode of operation that adopts spatial reuse.

Wherein, in step S110, the operation of determining the space diversity spectrum efficiency that each user is right is specially: right for each user in second user pair set, determine its two users that comprise first signal to noise ratio and second signal to noise ratio of correspondence under the space diversity mode of operation respectively, and obtain corresponding first modulation coding mode and second modulation coding mode according to first signal to noise ratio and second signal to noise ratio; Obtain the right space diversity spectrum efficiency of this user according to first modulation coding mode and second modulation coding mode; The operation of determining the spatial reuse spectrum efficiency that each user is right is specially: determine two users corresponding the 3rd signal to noise ratio and the 4th signal to noise ratio of difference under the spatial reuse mode of operation of user's centering, and obtain two users corresponding respectively the 3rd modulation coding mode and the 4th modulation coding modes according to the 3rd signal to noise ratio and the 4th signal to noise ratio; Obtain the right spatial reuse spectrum efficiency of user according to the 3rd modulation coding mode and the 4th modulation coding mode.

Preferably, in step S110, can with the user in second user pair set under the base station to user's mode of operation be configured to the mode of operation of space diversity.

In general, MIMO needs the sending and receiving end that many antennas are arranged, and in order to make the correlation between antenna little, certain required distance need be satisfied in the interval between these antenna.And the size of travelling carriage is limited, and according to the frequency range of using at present and planning, the size of travelling carriage can't satisfy the demand of many antennas, and the antenna of travelling carriage increases can cause rolling up of cost and power consumption, so travelling carriage generally has only an antenna.Use virtual MIMO technology so if desired, by a plurality of terminal cooperation way, wherein, the uplink coordinated cooperation that can support two MS, three MS, four MS, by distributing different Pilot patterns to distinguish different MS for different MS, Fig. 2 is exactly that two users match the structural representation that uses virtual MIMO.

Before implementing our bright implementation step, need set in advance following parameter: the lowest signal-to-noise threshold value VM_SNR_Thr=5dB of virtual MIMO, user's pairing period T 1 frame, period T 2 frames that the user is switched multi-antenna mode, the threshold T of characteristic of channel index (promptly, the first predetermined channel performance index threshold value mentioned above), the subcarrier ratio thresholding of characteristic of channel index thresholding is P (that is, mentioned above the second predetermined channel performance index threshold value).

Fig. 3 is the detailed process flow chart according to the switching method of the inventive method embodiment, in embodiments of the present invention, there are 6 to insert the user below certain BS, be respectively User1, User2, User3, User4, User5, User6, when these 6 initial connecting systems of user, all adopt the receive diversity pattern of system default to send data, as shown in Figure 3, this method may further comprise the steps:

Step S302, obtain above 6 users' signal to noise ratio, wherein, the signal to noise ratio of User1, User2, User3, User4, User5, User6 is respectively: SNR1=8dB, SNR2=15dB, SNRC=20dB, SNRD=-2dB, SNRE=30dB, SNR=0dB;

Step S304, according to these 6 users' signal to noise ratio, pick out the user of all signal to noise ratios greater than minimum threshold VM_SNR_Thr: User1, User2, User3, User5, wherein, User1, User2, User3, User5 form user's set;

Step S306, it is right that any two users among User1, User2, User3, the User5 are formed the user, the user who forms is to being: Pair1 (User1, User2), Pair2 (User1, User3), Pair3 (User1, User5), Pair4 (User2, User3), Pair5 (User2, User5), Pair6 (User3, User5), wherein, Pair1, Pair2, Pair3, Pair4, Pair5, Pair6 form first user pair set;

Step S308, judge that respectively the user is to the relation between the characteristic of channel index threshold of the characteristic of channel index of Pair1, Pair2, Pair3, Pair4, Pair5, Pair6 correspondence and setting, wherein, the characteristic of channel index that the user is right can be the right conditional number of user, also can be the right determinant of user, therefore for the relation between the characteristic of channel index threshold of judging characteristic of channel index that the user is right and setting, can adopt two kinds of methods to judge, be that example describes with the user to Pair1 below, the user that Pair1 comprises is what User2 of User1:

First kind of situation: choose the subcarrier set that User1 and User2 need adjudicate, for each subcarrier in the set, the channel matrix that User1 and User2 form is $H=\left[\begin{array}{cccc}{h}_{11}& h_{12}& \·\·\·& h_{1m}\\ \·& \·& \·& \·\\ \·& \·& \·& \·\\ \·& \·& \·& \·\\ h_{n1}& h_{n2}& \·\·\·& h_{\mathrm{nm}}\end{array}\right],$ Wherein, n is the antenna number of base station, and m is the total number of two users' antenna, obtains the maximum and the minimum value of the singular value of this channel matrix, is respectively λ ₁, λ ₂, according to λ ₁And λ ₂Calculate the conditional number of this channel matrix H

This conditional number be the user to Pair1 characteristic of channel index, if the conditional number of Pair1 smaller or equal to the threshold T of given characteristic of channel index, then Pair1 is that the user that satisfies condition is right;

For example, when the antenna number of User1 and User2 respectively be one, when the antenna number of base station is two, promptly when n=2, m=2, the channel coefficients of User1 correspondence is h ₁₁, h ₂₁, the channel coefficients of User2 correspondence is h ₁₂, h ₂₂, then the channel matrix of User1 and User2 composition is $H=\left[\begin{array}{cc}{h}_{11}& h_{12}\\ h_{21}& h_{22}\end{array}\right],$ The singular value that calculates this channel matrix is λ ₁, λ ₂, according to λ ₁, λ ₂Calculating the user to the conditional number of Pair1 is If λ ₁＞ ₂, then the user to the conditional number of Pair1 is

Determine that according to same method whether Pair2, Pair3, Pair4, Pair5, Pair6 be that the user that satisfies condition is right;

Second kind of situation: when the right number of transmission antennas summation of user equates with the reception antenna quantity of base station side, can utilize the relation between the characteristic of channel index threshold of right determinant of user and setting to judge whether the user satisfies condition, for example, the reception antenna quantity of base station side is two, when each user's number of transmission antennas was one, the channel matrix that User1 and User2 form was $H=\left[\begin{array}{ccc}{h}_{11}& \·\·\·& h_{1n}\\ \·& & \·\\ \·& \·\·\·& \·\\ \·& & \·\\ h_{n1}& \·\·\·& h_{\mathrm{nn}}\end{array}\right],$ Wherein, n is the antenna number of base station, and n also is two users' the total number of antenna, and this moment, H was upright matrix, and the determinant that the user is right is h ₁₁* ... * h _Nn-h _1n* ... * h _N1If the determinant of Pair1 is P more than or equal to the subcarrier ratio thresholding of the given characteristic of channel, then Pair1 is that the user that satisfies condition is right;

For example, when the antenna number of User1 and User2 respectively be one, when the antenna number of base station is two, promptly when n=2, m=2, the channel coefficients of User1 correspondence is h ₁₁, h ₂₁, the channel coefficients of User2 correspondence is h ₁₂, h ₂₂, then the channel matrix of User1 and User2 composition is $H=\left[\begin{array}{cc}{h}_{11}& h_{12}\\ h_{21}& h_{22}\end{array}\right],$ Calculating the user according to this channel matrix is h to the determinant of Pair1 ₁₁* h ₂₂-h ₁₂* h ₂₁

Determine that according to same method whether Pair2, Pair3, Pair4, Pair5, Pair6 be that the user that satisfies condition is right;

Step S310, suppose by step S308, Pair1, Pair4, Pair5, Pair6 are the user who satisfies condition that determines to (that is, reference user above to), and the subcarrier ratio that Pair1, Pair4, Pair5, Pair6 are corresponding respectively is P1, P4, P5, P6;

Step S312, sequence arrangement P1, P4, P5, P6 according to from big to small are made as P1＞P6＞P5＞P4, then at first select the Pair1 of P1 correspondence, other users that deletion is relevant with User2 with User1 then only are left Pair6 to Pair4 and Pair5 then, and the pairing user of final system is to being Pair1 and Pair6, for new pairing user to Pair1 and Pair6, wherein, Pair1 and Pair6 form second user pair set, and the data transfer mode of its acquiescence is a space diversity;

Step S314, after pairing is finished, the base station judges at first whether present frame should carry out switch decision, if present frame iFrame does not satisfy Mod (iFrame, T2)=0, then all users that do not matched use receive diversity transmission data, for the user of all pairings, use the affiliated right default data transmission means of user of this user; If present frame iFrame satisfy Mod (iFrame T2)=0, then arrives the switch decision cycle, and the base station is the spectrum efficiency of each user correspondence when using receive diversity and spatial reuse relatively, and its detailed process still describes with Pair1:

The snr value SIMO_SNR1 and the SIMO_SNR2 of correspondence that the base station at first obtains the signal to noise ratio VM_SNR1 of User1 and User2 associating usage space correspondence when multiplexing and VM_SNR2 and they when using receive diversity separately.Use VM_SNR1 and VM_SNR2 to remove to consult signal to noise ratio and Block Error Rate curve then, the modulation coding mode VM_UIUC1 and the VM_UIUC2 of correspondence when obtaining User1 and User2 use virtual MIMO.Utilize SIMO_SNR1 and SIMO_SNR2 to consult signal to noise ratio and Block Error Rate curve then, the modulation coding mode SIMO_UIUC1 and the SIMO_UIUC2 of correspondence when acquisition User1 and User2 use receive diversity separately;

Spectrum efficiency when then utilizing VM_UIUC1 and VM_UIUC2 to calculate the user: Eff_VM=2 to 1 use virtual MIMO * (Eff_VM_User1+Eff_VM_User2); Spectrum efficiency when utilizing SIMO_UIUC1 and SIMO_UIUC2 calculating User1 and User2 to use receive diversity separately: Eff_SIMO=Eff_SIMO_User1+Eff_SIMO_User2.If Eff_VM is greater than Eff_SIMO then the User1 of Pair1 and User2 use virtual MIMO, otherwise User1 and User2 use receive diversity to send data separately;

Use same process to carry out switching between receive diversity and the virtual MIMO for the user to Pair6.The data transfer mode of current switch decision should be as the data transfer mode of user to acquiescence, up to the switch decision cycle arrives or at least one user log off of user's centering or the arrival of system user pairing cycle next time.

In practical operation, multi-antenna mode switching cycle T2 can be set as required, when T2=0, the expression base station BS no longer carries out switch decision, and the user of the multiplexing mode of operation of usage space to all without exception the multiplexing mode of usage space transmit data.

Device embodiment

Fig. 4 shows the switching implement device schematic diagram according to the embodiment of the invention, and as shown in Figure 4, this device comprises:

First determination module 10 is used for determining user's set, and wherein, user's set comprises that signal to noise ratio under the base station is higher than a plurality of users of the snr threshold that sets in advance;

Second determination module 20 is used for all users of user's set are matched in twos, obtains first user pair set; This module can be connected to first determination module 10.

The 3rd determination module 30 is used for determining the right characteristic of channel index of each user of first user pair set, and the selective channel performance index to satisfy the reference user of predetermined condition right; This module can be connected to second determination module 20.

The 4th determination module 40, be used for according to each with reference to the right user of user group and and characteristic of channel index, in a predefined manner from reference user centering select the user to and form second user pair set, wherein, user in second user pair set wherein can utilize user's pair matcher as the 4th determination module 40 to not comprising same subscriber each other; This module can be connected to the 3rd determination module 30.

Processing module 50 is used for space diversity spectrum efficiency and the spatial reuse spectrum efficiency right according to each user of second user pair set, determines the mode of operation of each user in second user pair set, can utilize the switch decision device as processing module 50; This module can be connected to the 4th determination module 40.

Switching implement device by the embodiment of the invention provides is used in combination space diversity and spatial reuse, makes switching between diversity reception and spatial reuse of system self-adaption, has improved the transmission speed of data and the efficiency of operation of system.

As above, by means of switching method provided by the invention and/or device, space diversity and spatial reuse are used in combination, make between diversity reception and spatial reuse, switching of system self-adaption, improved the transmission rate gain of data, the maximized limited system bandwidth of having utilized, thus throughput of system improved greatly.

Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (14)

1. a switching method is characterized in that, comprising:

Determine that the user gathers, wherein, described user set comprises that signal to noise ratio under the base station is higher than a plurality of users of the snr threshold that sets in advance;

All users in described user's set are matched in twos, obtain first user pair set;

Determine the right characteristic of channel index of each user in described first user pair set, and the selective channel performance index to satisfy the reference user of predetermined condition right;

According to each with reference to the right user of user group and and characteristic of channel index, in a predefined manner from described with reference to user's centering select the user to and form second user pair set, wherein, the user in described second user pair set is not to comprising same subscriber each other;

According to space diversity spectrum efficiency and the spatial reuse spectrum efficiency that each user is right in described second user pair set, determine the mode of operation of each user in described second user pair set.

One of 2. method according to claim 1 is characterized in that, below described characteristic of channel index comprises at least: the conditional number that described user is right, the determinant that described user is right.

3. method according to claim 2 is characterized in that, the right operation of selecting to satisfy described predetermined condition according to the right conditional number of described user of reference user is specially:

The user that the right conditional number of selection user is less than or equal to the first predetermined channel performance index threshold value is right with reference to the user to conduct.

4. according to claim 2 or 3 described methods, it is characterized in that, determine that the operation of the conditional number that described user is right is specially:

Utilize the pairing channel coefficients of two users of described user's centering to form channel matrix, wherein, the channel coefficients of user's same antenna is positioned at the same row of described matrix, by the singular value of described channel matrix, determines the conditional number that described user is right.

5. method according to claim 4 is characterized in that, utilizes the pairing channel coefficients of two users of described user's centering to form channel matrix, by the singular value of described channel matrix, determines that the operation of the conditional number that described user is right is specially:

Two pairing channel coefficients of user of the described user's centering of described base station measurement are h ₁₁, h ₂₁..., h _N1, h ₁₂, h ₂₂..., h _N2..., h _1m..., h _Nm, wherein, n is the antenna number of described base station, m is user's a antenna number;

Determine that the channel matrix that the pairing channel coefficients of described two users is formed is

$H=\left[\begin{array}{cccc}{h}_{11}& h_{12}& \·\·\·& h_{1m}\\ \·& \·& \·& \·\\ \·& \·& \·& \·\\ \·& \·& \·& \·\\ h_{n1}& h_{n2}& \·\·\·& h_{\mathrm{nm}}\end{array}\right];$

Determine the maximum and the minimum value of described channel matrix singular value;

Determine that the right conditional number of described user is

Wherein, λ ₁Be described maximum, λ ₂Be described minimum value, perhaps, λ ₂Be described maximum, λ ₁Be described minimum value.

6. method according to claim 2 is characterized in that, is specially in the right operation of selecting to satisfy described predetermined condition according to the right matrix determinant of described user of user:

Select the right determinant of user right to conduct with reference to the user more than or equal to the user of the second predetermined channel performance index threshold value.

7. according to claim 2 or 6 described methods, it is characterized in that, determine that the operation of the determinant that described user is right is specially:

Equal in the internal user's of described user antenna amount sum to utilize the pairing channel coefficients of two users of described user's centering to form channel matrix under the situation of antenna amount of described base station, determine the determinant that described user is right.

8. method according to claim 7 is characterized in that, utilizes the pairing channel coefficients of two users of described user's centering to form channel matrix, determines that the operation of the determinant that described user is right is specially:

Determine that two pairing channel coefficients of user of described user's centering are respectively h ₁₁..., h _N1..., h _1n..., h _Nn, wherein, n is the antenna number of described base station;

Determine that the channel matrix that the pairing channel coefficients of described two users is formed is

$H=\left[\begin{array}{ccc}{h}_{11}& \·\·\·& h_{1n}\\ \·& & \·\\ \·& \·\·\·& \·\\ \·& & \·\\ h_{n1}& \·\·\·& h_{\mathrm{nn}}\end{array}\right];$

Determine the value of the determinant that described user is right.

9. method according to claim 1 is characterized in that, the right processing of selecting to form second user pair set of user is specially:

The user of the described predetermined reference user centering selective channel performance index optimum that satisfies condition to right as current optimal user;

From described with reference to user's centering remove described current optimal user to and right with described current optimal user to relevant user, and described after removing selects current optimal user right with reference to user's centering, until described user with reference to user's centering to all being removed, wherein, described being correlated with is meant that two users are to having an identical user;

Utilize the whole current optimal user of selecting to forming described second user pair set.

10. according to claim 2 or 5 described methods, it is characterized in that, determine that the operation of each user's mode of operation in described second user pair set is specially:

For each user in described second user pair set, compare the size of its space diversity spectrum efficiency and its spatial reuse spectrum efficiency;

Under the situation of described space diversity spectrum efficiency greater than described spatial reuse spectrum efficiency relatively, two users that determine this user's centering adopt the mode of operation of space diversity; Otherwise, determine that two users of this user's centering unite the mode of operation that adopts spatial reuse.

11. method according to claim 1 is characterized in that, determines that the operation of the space diversity spectrum efficiency that each user is right is specially:

Right for each user in described second user pair set, determine its two users that comprise first signal to noise ratio and second signal to noise ratio of correspondence under the space diversity mode of operation respectively, and obtain corresponding first modulation coding mode and second modulation coding mode according to described first signal to noise ratio and second signal to noise ratio;

Obtain the right space diversity spectrum efficiency of this user according to described first modulation coding mode and described second modulation coding mode.

12. method according to claim 1 is characterized in that, determines that the operation of the spatial reuse spectrum efficiency that each user is right is specially:

Determine two users corresponding the 3rd signal to noise ratio and the 4th signal to noise ratio of difference under the spatial reuse mode of operation of described user's centering, and obtain two users corresponding respectively the 3rd modulation coding mode and the 4th modulation coding modes according to described the 3rd signal to noise ratio and the 4th signal to noise ratio;

Obtain the right spatial reuse spectrum efficiency of described user according to described the 3rd modulation coding mode and described the 4th modulation coding mode.

13. method according to claim 1 is characterized in that, with the user in described second user pair set under the described base station to user's mode of operation be configured to the mode of operation of space diversity.

14. one kind switches implement device, it is characterized in that, comprising:

First determination module is used for determining user's set, and wherein, described user's set comprises that signal to noise ratio under the base station is higher than a plurality of users of the snr threshold that sets in advance;

Second determination module is used for all users of described user's set are matched in twos, obtains first user pair set;

The 3rd determination module is used for determining the right characteristic of channel index of described each user of first user pair set, and the selective channel performance index to satisfy the reference user of predetermined condition right;

The 4th determination module, be used for according to each with reference to the right user of user group and and characteristic of channel index, in a predefined manner from described with reference to user's centering select the user to and form second user pair set, wherein, the user in described second user pair set is not to comprising same subscriber each other;

Processing module is used for space diversity spectrum efficiency and the spatial reuse spectrum efficiency right according to described each user of second user pair set, determines the mode of operation of each user in described second user pair set.

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