CN101459942A - Method and mobile terminal for determining transmission end of base station - Google Patents

Abstract

The embodiment of the invention discloses a method for determining a base station transmitting end, which comprises: taking all base stations BS or all antennae of all BS with centralized activation as candidate transmitting ends, selecting one candidate transmitting end combination with optimum space channel conditions from combinations composed of the candidate transmitting ends as a transmitting end combination, determining to provide services for an MS by the transmitting end combination when the space channel conditions of the transmitting end combination are judged to be better than the space channel conditions of all candidate transmitting ends to the mobile terminal MS. The embodiment of the invention also discloses the mobile terminal for determining the base station transmitting end, the mobile terminal comprises a selecting module, a judging module and a transmitting end determining module, and an optimum transmitting end can be determined dynamically through applying the method and the mobile terminal.

Description

A kind of method of definite transmission end of base station and portable terminal

Technical field

The present invention relates to moving communicating field, particularly a kind of method of definite transmission end of base station and portable terminal.

Background technology

Switching is portable terminal (Mobile Station, MS) moved to the process of the area of coverage of another BS by the area of coverage of a base station (Base Station), switching flow comprises that the area of coverage selects, switches decision, initialization and be synchronized to step such as target coverage district.The area of coverage here can be the sub-district that BS covers, and also can be the sector that BS covers, thereby cell selecting comes down to MS to the selection of the BS of communication with it.

Switch and mainly comprise two kinds of switching modes, i.e. hard handover approach and soft handoff.Wherein, for soft handoff, often need MS to safeguard a BS tabulation that is called Active Set, this Active Set is the signal strength signal intensity by MS search neighbor bss, and select according to the threshold value of setting that the bigger BS of signal strength signal intensity obtains, at present, mainly contain two kinds of soft handover methods:

First kind of soft handover method, (Macro Diversity Handover, MDHO), promptly a plurality of BS provide service for a MS simultaneously, the Active Set of these BS compositions MS to be called grand diversity switching.MS can upgrade Active Set at set intervals.In the MDHO process, MS will communicate with all BS in the Active Set and synchronously, promptly in down link, all BS in the Active Set are a MS service simultaneously, and in up link, all BS that the data message that MS sends will be activated concentrated receive simultaneously.

Another kind of soft handover method, be called fast base station and switch (Fast Base Station Switching, FBSS), the difference of FBSS and MDHO is, in the FBSS handoff procedure, though all BS carry out synchronously in mobile subscriber and the Active Set, but it only and one of them BS communicate, MS needs constantly to monitor the signal strength signal intensity of BS in the Active Set, and from current Active Set, select the BS that signal strength signal intensity is the strongest as target BS, and can pass through channel or other message, as the channel quality indicating channel (Channel QualityIndication Channel, CQICH) CQICH or terminal handoff request message (Mobile MS Handoverrequest message, MOB_MSHO-REQ), notify this target BS, provide service for MS by this target BS.

On the other hand, along with multiple-input and multiple-output (Multiple-Input Multiple-Output, MIMO) development of technology, each BS all has a plurality of antennas, BS becomes complicated more to the channel conditions between MS, thereby in the communication system of using the MIMO technology, when switching, be difficult to provide higher data speed.Such as, for MDHO, the antenna of all target BS is formed an antenna pond, when channel variation is frequent, the target BS that present frame is selected may be optimum, but because channel variation will no longer be optimum selection at next frame, shown in Fig. 1-a, Fig. 1-b and Fig. 1-c.All BS that the hypothesis activation collection comprises are BS1 and BS3, and when first frame, the channel conditions of BS1 and BS3 antenna is good, shown in Fig. 1-a.And at second frame, BS1 channel conditions variation, but because not renewal of Active Set, thereby still use BS1 and BS3 to provide service to MS, shown in Fig. 1-b.At the 3rd frame, the channel conditions of BS1, BS2 and BS3 all changes, and still use BS1 and BS3 to provide service to MS this moment, shown in Fig. 1-c.As seen when the channel conditions variation was faster than the renewal Active Set, communication system can't use optimum BS and MS to communicate.

And for FBSS, though when channel conditions changes, MS can select another BS to provide service as next target BS for MS, but, because the antenna distance of same BS is nearer, interferes with each other sometimes, the antenna of same BS has certain correlation in other words, such combination of antennas is not to be optimum, thereby higher data speed can't be provided.

The inventor is in realizing process of the present invention, find that there are the following problems at least in the prior art: all use the system of selection of select target BS in advance in the handoff procedure at present, and the target BS of selecting can't adaptive channel complexity change, that is to say, determine the method for transmission end of base station at present, can not determine out the optimum transmit end that service is provided to MS, thereby need the raising transmitting power or reduce traffic rate to guarantee normal communication, influence capability of communication system.

Therefore, portable terminal is determined the method for transmission end of base station at present, can't dynamically determine best transmitting terminal.

Summary of the invention

In view of this, the embodiment of the invention provides a kind of method of definite transmission end of base station, and this method can dynamically be determined best transmitting terminal.

The embodiment of the invention also provides a kind of portable terminal of definite transmission end of base station, and this portable terminal can be determined best transmitting terminal.

For achieving the above object, the technical scheme of the embodiment of the invention specifically is achieved in that

A kind of method of definite transmission end of base station, this method comprises:

All antennas of all BS in the Active Set or described all BS as the candidate transmitting end, from the combination that is made of described candidate transmitting end, are selected a candidate transmitting end combination of space channel situation optimum and made up as transmitting terminal;

When the space channel situation of judging the combination of described transmitting terminal was better than all candidate transmitting ends to the space channel situation of mobile terminal MS, determining to be made up by described transmitting terminal provided service to MS.

A kind of portable terminal of definite transmission end of base station, this portable terminal comprises:

Select module, be used for all antennas with all BS of Active Set or described all BS, from the combination that constitutes by described candidate transmitting end, select a candidate transmitting end combination of space channel situation optimum and make up as transmitting terminal as the candidate transmitting end;

Judge module is used to judge whether the space channel situation of the transmitting terminal combination that described selection module obtains is better than the space channel situation of all candidate transmitting ends to MS;

The transmitting terminal determination module is used for when judge module shows that the space channel situation of transmitting terminal combination is better than all BS of described Active Set to the space channel situation of MS, and determining to be made up by described transmitting terminal provides service to MS.

As seen from the above technical solution, determine the method and the portable terminal of transmission end of base station in the embodiment of the invention, constituting a combination of antennas or a BS combination of selecting the channel conditions optimum the combination by all antennas from all BS of Active Set or described all BS makes up as transmitting terminal, when being better than single BS or individual antenna, be combined as MS by this transmitting terminal service is provided, thereby can dynamically determine best transmitting terminal.

Description of drawings

Fig. 1-a is the preselected schematic diagram of MDHO antenna during first frame in the prior art;

Fig. 1-b is the preselected schematic diagram of MDHO antenna during second frame in the prior art;

Fig. 1-c is the preselected schematic diagram of MDHO antenna during the 3rd frame in the prior art;

Fig. 2 is the method flow schematic diagram of definite transmission end of base station of adopting in the embodiment of the invention;

Fig. 3-a is a schematic diagram of selecting the BS combination in the first embodiment of the invention;

Fig. 3-b is a schematic diagram of selecting single BS in the first embodiment of the invention;

Fig. 4 is a method flow diagram of determining transmission end of base station in the first embodiment of the invention;

Fig. 5 is a schematic diagram of selecting combination of antennas in the second embodiment of the invention;

Fig. 6 is a method flow diagram of determining transmission end of base station in the second embodiment of the invention;

The mobile terminal structure schematic diagram of Fig. 7 for adopting in the embodiment of the invention.

Embodiment

For the purpose, technical scheme and the advantage that make the embodiment of the invention is clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the embodiment of the invention is described in further detail.

The embodiment of the invention determines that the method for transmission end of base station comprises: with all antennas of all BS in the Active Set or described all BS as the candidate transmitting end, from the combination that constitutes by described candidate transmitting end, select a candidate transmitting end combination of space channel situation optimum and make up as transmitting terminal; When the space channel situation of judging the combination of described transmitting terminal was better than all candidate transmitting ends to the space channel situation of mobile terminal MS, determining to be made up by described transmitting terminal provided service to MS.Fig. 2 is a method flow schematic diagram of determining transmission end of base station in the embodiment of the invention.As shown in Figure 2, specifically may further comprise the steps:

Step 201: all antennas of all BS in the Active Set or all BS as the candidate transmitting end, are constituted the combination of candidate transmitting end to the candidate transmitting end.

In this step, the method that the candidate transmitting end is made up is: the candidate transmitting end is carried out combination in any, the numerical value of candidate transmitting end number for setting in the combination of candidate transmitting end.Such as, when the candidate makes a start end when the BS, 4 base stations are arranged in the Active Set, be respectively A, B, C and D, when the BS number in setting the BS combination is 2, the BS combination of forming by AC, BC, AB, AD, BD and CD can be arbitrarily made with, when the BS number in setting the BS combination is 3, the BS combination of forming by ABC, BCD, ABD and ACD can be arbitrarily made with.

Step 202: from the combination that constitutes by the candidate transmitting end, select a candidate transmitting end combination of space channel situation optimum and make up as transmitting terminal.

In this step, the method for selecting candidate transmitting end combination of space channel situation optimum has multiple, can carry out the comparison of space channel situation by the minimum euclidean distance of candidate transmitting end relatively.This method will be done in the back and specify.

When the candidate transmitting end is combined as combination of antennas, also can obtain the minimum combination of antennas of Antenna Correlation by comparing the Antenna Correlation in each combination of antennas.Here Antenna Correlation refers to: transmitting antenna can be used covariance Cov (H to the degree of the phase mutual interference of each interchannel of reception antenna ₁, H ₂) represent, wherein, H ₁And H ₂Be respectively the channel response sequence h of n the transmitting antenna of i BS to m reception antenna of MS _{I_mn}In arbitrarily different two channel response sequences.By following formula, find out two combination of antennas of channel relevancy minimum: $i^{*},j^{*}=\arg \underset{i,m,n}{\min }\left(\mathrm{Cov}(H_1,H_2)\right).$

Step 203: when the space channel situation of transmitting terminal combination was better than all single candidate transmitting ends to the space channel situation of MS, determining to be made up by transmitting terminal provided service to MS.

In this step,, provide service to MS by the transmitting terminal combination when the minimum euclidean distance of transmitting terminal combination during greater than the maximum of the average channel response mould of single candidate transmitting end square.Perhaps according to the comparative result of Antenna Correlation, provide service to MS by a combination of antennas of channel relevancy minimum.

If the transmitting terminal of selecting is combined as the BS combination, then provide service to MS by all BS in this BS combination.If the transmitting terminal of selecting is combined as combination of antennas, then provide service with all days alignment MS in this combination of antennas.

First preferred embodiment of transmission end of base station is determined in following mask body introduction, and present embodiment is unit with the base station, and MS can select two or more BS to use the SM mode to transmit data as target BS, shown in Fig. 3-a.MS also can select the best BS of space channel situation to transmit data as single target BS by the STBC mode, shown in Fig. 3-b.Fig. 4 is the method flow schematic diagram of first embodiment of the invention, as shown in Figure 4, specifically may further comprise the steps:

Step 401: computing activation is concentrated the average channel response of each BS.

Present embodiment makes h _iBe i the channel response on all antennas of base station, such as, for 2 * 2MIMO system, the channel response on i all antenna of base station as shown in Equation (1):

$h_i=\left[\begin{array}{cc}{h}_{i\_11}& h_{i\_12}\\ h_{i\_21}& h_{i\_22}\end{array}\right]---\left(1\right)$

Wherein, h _{I_mn}Represent the channel response of n the antenna of i BS to m the antenna of MS.In the present embodiment, MS utilizes frequency pilot sign can measure the descending mimo channel response h of BS _{I_mn}

Make p _iBe the average channel response of base station, then p _iCan represent by formula (2):

$p_i=\sqrt{\mathrm{trace}(h_i\·h_i^{*})}---\left(2\right)$

Wherein,

Be the transposition of h, trace (x) is for asking the mark of matrix x, i.e. diagonal of a matrix element sum.For 2 * 2MIMO system, can obtain formula (3) by formula (2):

$p_i=\sqrt{{\left|h_{i\_11}\right|}^2+{\left|h_{i\_12}\right|}^2{\left|h_{i\_21}\right|}^2{\left|h_{i\_22}\right|}^2}---\left(3\right)$

Promptly to evolution again after square summation of the channel response mould on all antennas of this base station.

Step 402:, relatively obtain the maximum of BS average channel response mould square according to the average channel response of each BS.

Present embodiment makes d _RefThe maximum of expression average channel response mould square then is expressed as formula (4):

$d_{\mathrm{ref}}=\underset{i}{\max }\left({\left|p_i\right|}^2\right)---\left(4\right)$

Step 403: two BS that selection was not made up from Active Set, the minimum euclidean distance in signal calculated space.

In the present embodiment, suppose that the BS number that sets in advance is two, when the BS combination comprised i BS and j BS, the average channel response of establishing i BS was p _i, the average channel response of j BS is p _j, the minimum euclidean distance d of this BS combination _{I, j}Obtain by formula (5):

d _i，j＝min(d _i，j，1，d _i，j，2，d _i，j，3) (5)

Wherein, d _{I, j, 1}=| p _i| ², d _{I, j, 2}=| p _j| ², d _{I, j, 3}=| p _i| ²+ | p _j| ²-2p _iP _jHere | x| ²The square value of the mould of expression x.

Step 404: judge whether all BS all in twos combination calculation go out the minimum euclidean distance of signal space, if then execution in step 405, otherwise, execution in step 403.

Step 405: the maximum that relatively obtains the minimum euclidean distance of signal space in the BS combination

In the present embodiment, find in BS combination the maximum of minimum euclidean distance between two BS, and obtain BS combination this moment (i according to formula (6) ^*, j ^*):

$\{i^{*},j^{*}\}\text{=arg}\underset{\{i,j\}}{\max }\left(d_{i,j}\right)---\left(6\right).$

Step 406: judge Whether greater than d _Ref, if then select

Two corresponding BS are as target BS, otherwise, with d _RefA corresponding BS is as target BS.

In the present embodiment, suppose the corresponding relation of the number of the data transfer mode that sets in advance and target BS, be specially: target BS is during at least two, multiplexing (the SM of usage space, Spatial Multiplexing) data transfer mode, when described target BS is one, use space-time block coding (STBC) transmission means.

Then inciting somebody to action

And d _RefAfter comparing, if satisfy $d_{i^{*},j^{*}}<d_{\mathrm{ref}},$ d _RefA corresponding BS is as target BS and use the STBC data transfer mode to provide service to MS.If $d_{i^{*},j^{*}}\&GreaterEqual;d_{\mathrm{ref}},$ Just select Two corresponding BS are as target BS, and use the SM data transfer mode to provide service to MS, and the SM data transfer mode is divided into a plurality of streams with data, and each stream all uses the low-order-modulated mode, transmits such as QPSK.

Step 407: report the sign of target BS and the data transfer mode of use.

The sign (ID) and the MIMO data transfer mode of the target BS that present embodiment, MS are chosen by the CQICH channel feedback also can be fed back by other channel.Here, the MIMO data transfer mode is: SM or STBC transmission means.The total length of feedback information is that the ID length of BS adds 1 (bit) that is used to refer to the MIMO transmission mode.MOB_MSHO-REQ message or other message be can certainly lead to and Target id and MIMO data transfer mode reported.

Present embodiment is when selecting at least two target BS, use the SM mode to transmit data, at this moment, multiple target BS is divided into a plurality of banishing on a plurality of BS with data to be transmitted, thereby can use the low-order-modulated mode to reach higher data speed, thereby improve the transmission performance of MS.

Certainly, present embodiment can be according to setting the BS number that comprises in the BS combination, from Active Set, select BS such as 3,4 and carry out combination in any, then each BS combination that obtains is compared, obtain the pairing BS combination of maximum of the minimum euclidean distance of signal space in the BS combination.

Second preferred embodiment of transmission end of base station determined in following mask body introduction, and present embodiment is unit with the antenna, and MS can select at least two antenna transmission data on the different B S, as shown in Figure 5.

Fig. 6 is a method flow schematic diagram of determining transmission end of base station in the second embodiment of the invention, as shown in Figure 6, specifically may further comprise the steps:

Step 601: computing activation is concentrated the average channel response of each antenna of each BS.

In the present embodiment, i represents basic station number, and m represents the reception antenna sequence number of portable terminal, and u represents the antenna sequence number of base station, q _{I, n}When being the average channel response of u antenna of i BS, q then _{I, u}Satisfy formula (7):

$q_{i,u}^2=\underset{m}{\mathrm{\&Sigma;}}\left({\left|h_{i\_\mathrm{mu}}\right|}^2\right)---\left(7\right)$

That is to say,

Equal many channel response quadratic sums of antenna, such as, when two reception antennas being arranged for MS then the average channel response mould of u antenna of i BS square be: $q_{i,u}^2={\left|h_{i\_1u}\right|}^2+{\left|h_{i\_2u}\right|}^2.$

Step 602:, relatively obtain the maximum of the average channel response mould square of antenna according to the average channel response of each antenna.

Present embodiment, order

The maximum of expression average channel response mould square then is expressed as formula (8):

$d_{\mathrm{ref}}^{\&prime;}=\underset{i,u}{\max }\left(q_{i,u}^2\right)---\left(8\right)$

Step 603: two antennas that selection was not made up from Active Set, the minimum euclidean distance in signal calculated space.

Present embodiment, the antenna number of supposing to set in advance in the combination of antennas is two, and the combination of antennas selected of hypothesis is when comprising v antenna of u the antenna of i BS and j BS, the average channel response of establishing u the antenna of i antenna BS is q _{I, u}, the average channel response of v the antenna of j BS is q _{J, v}, the minimum euclidean distance d of this combination of antennas _{I, j}Obtain by formula (9):

d _i，j＝min(d _i，j，1，d _i，j，2，d _i，j，3) (9)

Wherein, d _{I, j, 1}=| q _{I, u}| ², d _{I, j, 2}=| q _{J, v}| ², d _{I, j, 3}=| q _{J, v}| ²+ | q _{J, v}| ²-2q _{I, u}Q _{J, v}

In the present embodiment, two antennas selecting can be to belong to a BS, also can belong to two different B S respectively.

Step 604: judge whether all antennas all in twos combination calculation go out the minimum euclidean distance of signal space, if then execution in step 605, otherwise, execution in step 603.

Step 605: the maximum that relatively obtains minimum euclidean distance in the combination of antennas.

In the present embodiment, find maximum d between two BS combinations _{I, j}, and obtain BS combination this moment (i according to formula (10) ^*, j ^*):

$\{i^{*},j^{*}\}\text{=arg}\underset{\{i,j\}}{\max }\left(d_{i,j}\right).$

Step 606: judge

Whether greater than If then will

Two corresponding transmission end of base station that the antennas conduct is selected, otherwise, will

The transmission end of base station that corresponding antenna conduct is selected.

In the present embodiment, will

With

Compare, satisfying $d_{i^{*},j^{*}}<d_{\mathrm{ref}}^{\&prime;}$ The time,

BS under the corresponding antenna is as target BS. $d_{i^{*},j^{*}}\&GreaterEqual;d_{\mathrm{ref}}^{\&prime;}$ The time, if i ^*And j ^*Be two antennas on the same base station, then with this base station as target BS.If i ^*And j ^*Be two antennas on the different base station, then with these two BS as target BS, can use the SM transmission means that data are divided into a plurality of streams this moment, each stream all uses low-order modulation scheme transmission.

Certainly, present embodiment can be according to setting the antenna number that comprises in the combination of antennas, from all antennas of Active Set, select antennas such as 3,4,5 and carry out combination in any, then each combination of antennas that obtains is compared, obtain the pairing combination of antennas of maximum of the minimum euclidean distance of signal space in the BS combination.

In the present embodiment, by comparing the minimum euclidean distance of combination of antennas to MS, simultaneously, compare by minimum euclidean distance with individual antenna, from Active Set, select the combination of antennas of channel conditions optimum, and the SM data-transmission mode by adopting at a plurality of BS, can be by using the low-order-modulated mode and reducing through-put power, to reduce the phase mutual interference of minizone, finally provide capability of communication system.

The mobile terminal structure schematic diagram of Fig. 7 for adopting in the embodiment of the invention, this portable terminal comprises:

Select module 710, all antennas of all BS in the Active Set or all BS as the candidate transmitting end, from the combination that is made of described candidate transmitting end, are selected a candidate transmitting end combination of space channel situation optimum and made up as transmitting terminal.

Judge module 720 judges whether the space channel situation of the transmitting terminal combination that selection module 710 obtains is better than the space channel situation of all candidate transmitting ends to MS.

Transmitting terminal determination module 730, when judge module 720 showed that the space channel situation of transmitting terminal combination is better than all BS in the described Active Set to the space channel situation of MS, determining to be made up by described transmitting terminal provided service to MS.

Portable terminal can also comprise:

Target BS determination module 740 is used for the BS of the transmitting terminals combination determined according to transmitting terminal determination module 730 or the antenna of BS, determines target BS.

Transmission means determination module 750, BS in the transmitting terminals combination of determining according to transmitting terminal determination module 730 or the antenna of BS, with the data transfer mode of STBC transmission means, with the data transfer mode of spatial reuse data SM transmission means as the antenna use of different B S as the antenna use of identical BS.

Sending module 760 utilizes the sign of the target BS that the described target BS determination module 740 of control channel or information reporting determines and the data transfer mode that transmission means determination module 750 is determined.

Particularly, select module 710 to comprise:

Assembled unit 711 carries out combination in any to the candidate transmitting end, the numerical value of candidate transmitting end number for setting in the combination of candidate transmitting end.

Each candidate transmitting end that comparing unit 712, comparison combination unit 711 obtain is combined to the space channel situation of MS.

Performance element 713 according to the comparative result of comparing unit 712, is selected a candidate transmitting end combination of space channel situation optimum and is made up as transmitting terminal.

When comparing the space channel situation for the employing minimum euclidean distance, comparing unit 712 comprises:

Channel calculation subelement 714 according to each antenna of each BS that measures channel response to the MS reception antenna, calculates the average channel response of each candidate transmitting end.

Euclidean distance computation subunit 715, the average channel response of each the candidate transmitting end that obtains according to channel calculation subelement 714, calculate the minimum euclidean distance of each candidate transmitting end combination, the numerical value that the candidate transmitting end number in the combination of candidate transmitting end equals to set in advance.

Euclidean distance is subelement 716 relatively, is used for the minimum euclidean distance of each candidate transmitting end combination that comparison Euclidean distance computation subunit 715 calculates, and obtains a candidate transmitting end combination of minimum euclidean distance maximum.

Performance element 713, the candidate transmitting end combination of the minimum euclidean distance maximum that Euclidean distance comparison subelement 716 is obtained is made up as the transmitting terminal of selecting.

Judge module 720 comprises:

Whether first performance element 721, the minimum euclidean distance of judging transmitting terminal combination be greater than the maximum of the average channel response mould of single candidate transmitting end square.

First identifying unit 722, when being used for minimum euclidean distance that judged result at first performance element 721 shows described transmitting terminal combination, judge that the space channel situation of described transmitting terminal combination is better than the space channel situation of described all candidate transmitting ends to MS greater than the maximum of the average channel response mould of single candidate transmitting end square.

When the candidate transmitting end was combined as combination of antennas, when comparing the space channel situation for the employing Antenna Correlation, comparing unit 712 comprised:

First correlation is subelement relatively, is used for the Antenna Correlation of each combination of antennas of comparison, obtains a candidate transmitting end combination of Antenna Correlation minimum.

Performance element 713, the combination of antennas of the correlation minimum that the first correlation comparison subelement is relatively obtained is as the transmitting terminal combination of selecting.

In sum, the embodiment of the invention, by comparing the space channel situation of candidate transmitting end to MS, simultaneously, compare selection by space channel situation, can from Active Set, select the combination of antennas or the BS combination of channel conditions optimum with single candidate transmitting end, and the SM data-transmission mode by adopting at a plurality of BS, can further improve data transmission performance, capability of communication system finally is provided.

The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (17)

1, a kind of method of definite transmission end of base station is characterized in that, this method comprises:

All antennas of all base station BSs in the Active Set or described all BS as the candidate transmitting end, from the combination that is made of described candidate transmitting end, are selected a candidate transmitting end combination of space channel situation optimum and made up as transmitting terminal;

When the space channel situation of judging the combination of described transmitting terminal was better than all candidate transmitting ends to the space channel situation of mobile terminal MS, determining to be made up by described transmitting terminal provided service to MS.

2, method according to claim 1, it is characterized in that, a described candidate transmitting end combination selecting space channel situation optimum is made up as transmitting terminal and is comprised: described candidate transmitting end is carried out combination in any, the numerical value of candidate transmitting end number for setting in the described candidate transmitting end combination; Relatively each described candidate transmitting end is combined to the space channel situation of MS; Selecting a candidate transmitting end combination of a space channel situation optimum makes up as transmitting terminal.

3, method according to claim 2, it is characterized in that, the space channel situation that each candidate transmitting end of described comparison is combined to MS comprises: according to each antenna of each BS that measures channel response to the MS reception antenna, calculate the average channel response of each candidate transmitting end; According to the average channel response of described each candidate transmitting end, calculate the minimum euclidean distance of each candidate transmitting end combination; The minimum euclidean distance of each the candidate transmitting end combination that relatively calculates obtains a candidate transmitting end combination of minimum euclidean distance maximum.

4, method according to claim 3 is characterized in that, it is 2 BS combination that described candidate transmitting end is combined as the BS number; If a BS who selects arbitrarily is combined as i BS and j BS, the average channel response of i BS is p _i, the average channel response of j BS is p _j, the minimum euclidean distance d of described calculating BS combination _{I, j}For: d _{I, j}=min (d _{I, j, 1}, d _{I, j, 2}, d _{I, j, 3}), wherein, d _{I, j, 1}=| p _i| ², d _{I, j, 2}=| p _j| ², d _{I, j, 3}=| p _i| ²+ | p _j| ²-2p _iP _j

5, method according to claim 3 is characterized in that, it is 2 combination of antennas that described candidate transmitting end is combined as the antenna number; If u antenna that a combination of antennas of selecting arbitrarily is i BS and v the antenna of j BS, the average channel response of u the antenna of i antenna BS is q _{I, u}, the average channel response of v the antenna of j BS is q _{J, v}, the minimum euclidean distance d of the described combination of antennas of described calculating _{I, j}For: d _{I, j}=min (d _{I, j, 1}, d _{I, j, 2}, d _{I, j, 3}), wherein, d _{I, j, 1}=| q _{I, u}| ², d _{I, j, 2}=| q _{J, v}| ², d _{I, j, 3}=| q _{I, u}| ²+ | q _{I, v}| ²-2q _{I, u}Q _{J, v}

6, according to claim 2,3,4 or 5 described methods, it is characterized in that, the space channel situation of judging the combination of described transmitting terminal is better than all candidate transmitting ends and comprises to the space channel situation of MS: judge that minimum euclidean distance that described transmitting terminal makes up is whether greater than the maximum of the average channel response mould of single candidate transmitting end square, if judge that then the space channel situation of described transmitting terminal combination is better than the space channel situation of described all candidate transmitting ends to MS.

7, method according to claim 2 is characterized in that, described candidate transmitting end is combined as combination of antennas, and the space channel situation that each described candidate transmitting end of described comparison is combined to MS comprises:

The Antenna Correlation of each combination of antennas relatively obtains a combination of antennas of Antenna Correlation minimum.

8, method according to claim 1, it is characterized in that, determine by the transmitting terminal combination after MS provides service described, this method further comprises: according to BS in the described transmitting terminal combination or the antenna of BS, determine target BS and corresponding data transfer mode.

9, method according to claim 8, it is characterized in that, the data transfer mode of described definite correspondence comprises: with the data transfer mode of STBC transmission means as the antenna use of identical BS, with the data transfer mode of spatial reuse data SM transmission means as the antenna use of different B S.

10, method according to claim 9 is characterized in that, described determine target BS and corresponding data transfer mode after, further comprise: sign and the corresponding data transfer mode of utilizing control channel or the described target BS of information reporting.

11, method according to claim 10 is characterized in that, described control channel is channel quality indicating channel CQICH;

Described message comprises: terminal handoff request message MOB_MSHO-REQ message.

12, a kind of portable terminal of definite transmission end of base station is characterized in that, this portable terminal comprises:

Select module, be used for all antennas with all BS of Active Set or described all BS, from the combination that constitutes by described candidate transmitting end, select a candidate transmitting end combination of space channel situation optimum and make up as transmitting terminal as the candidate transmitting end;

Judge module is used to judge whether the space channel situation of the transmitting terminal combination that described selection module obtains is better than the space channel situation of all candidate transmitting ends to MS;

The transmitting terminal determination module is used for when judge module shows that the space channel situation of transmitting terminal combination is better than all BS of described Active Set to the space channel situation of MS, and determining to be made up by described transmitting terminal provides service to MS.

13, portable terminal according to claim 12 is characterized in that, described selection module comprises:

Assembled unit carries out combination in any to described candidate transmitting end, the numerical value of candidate transmitting end number for setting in the described candidate transmitting end combination;

Each candidate transmitting end that comparing unit, more described assembled unit obtain is combined to the space channel situation of MS;

Performance element according to the comparative result of described comparing unit, is selected a candidate transmitting end combination of space channel situation optimum and is made up as transmitting terminal.

14, portable terminal according to claim 13 is characterized in that, described comparing unit comprises:

The channel calculation subelement is used for calculating the average channel response of each candidate transmitting end according to each antenna of each BS of measuring channel response to the MS reception antenna;

The Euclidean distance computation subunit, the average channel response that is used for each candidate transmitting end of obtaining according to described channel calculation subelement, calculate the minimum euclidean distance of each candidate transmitting end combination, the numerical value that the candidate transmitting end number in the described candidate transmitting end combination equals to set in advance;

Euclidean distance is subelement relatively, is used for the minimum euclidean distance of each candidate transmitting end combination that more described Euclidean distance computing unit calculates, and obtains a candidate transmitting end combination of minimum euclidean distance maximum;

Described performance element, the candidate transmitting end combination of the minimum euclidean distance maximum that described Euclidean distance comparison subelement is obtained is made up as the transmitting terminal of selecting.

15, portable terminal according to claim 12 is characterized in that, described judge module comprises:

Whether first performance element, the minimum euclidean distance that is used to judge described transmitting terminal combination be greater than the maximum of the average channel response mould of single candidate transmitting end square;

First identifying unit, when being used for minimum euclidean distance that judged result at described first performance element shows described transmitting terminal combination, judge that the space channel situation of described transmitting terminal combination is better than the space channel situation of described all candidate transmitting ends to MS greater than the maximum of the average channel response mould of single candidate transmitting end square.

16, portable terminal according to claim 13 is characterized in that, described candidate transmitting end is combined as combination of antennas, and described comparing unit comprises:

First correlation is subelement relatively, is used for the Antenna Correlation of each combination of antennas of comparison, obtains a candidate transmitting end combination of Antenna Correlation minimum;

Described performance element, the combination of antennas of the correlation minimum that the first correlation comparison subelement is relatively obtained is as the transmitting terminal combination of selecting.

17, portable terminal according to claim 12 is characterized in that, described portable terminal further comprises:

The target BS determination module is used for determining target BS according to the BS of described transmitting terminal combination or the antenna of BS;

The transmission means determination module, be used for according to the BS of described transmitting terminal combination or the antenna of BS, with the data transfer mode of STBC transmission means, with the data transfer mode of spatial reuse data SM transmission means as the antenna use of different B S as the antenna use of identical BS.

Sending module is used to utilize the sign of the target BS that control channel or the described target BS determination module of information reporting determine and the data transfer mode that described transmission means determination module is determined.

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