CN101965011A - Method and device for realizing selection of multiple antenna transmission modes - Google Patents

Abstract

The invention provides a method and device for realizing selection of multiple antenna transmission modes. The method of the invention comprises the following steps: a base station determines that multiple antenna access modes need switching according to system load; the base station selects a first user of a virtual multiple input multiple output (V-MIMO) mode, and selects a matched user of the V-MIMO mode; and the base station sends control information to the matched user adopting the V-MIMO mode. By the scheme of the invention, the system realizes selection between single-user multiple input multiple output (SU-MIMO)/multi-user multiple input multiple output (MU-MIMO) and V-MIMO of the multiple antenna transmission modes. The invention effectively exerts the effect of MU-MIMO, relieves the problem of excessive load in an LTE uplink, and acquires higher system throughput by fully using space resources.

Description

A kind of method and device of realizing the defeated model selection of multi-antenna transmitting

Technical field

The present invention relates to multiple-input, multiple-output (MIMO, Multi-Input Multi-Output) technology, refer to a kind of method and device of realizing the defeated model selection of multi-antenna transmitting especially.

Background technology

In order to realize the throughput of high speed data transfers and raising system, in 3G Long Term Evolution (LTE, Long Term Evolution) standard, introduced the MIMO technology that can make full use of space resources.

In order to solve the excessive problem of load effectively, make more user connecting system simultaneously, having proposed a kind of uplink multi-users among the LTE is virtual MIMO (V-MIMO with the pattern of frequency connecting system simultaneously, Virtual Multi-Input Multi-Output) pattern, transmit the degree of freedom that increases resource allocation by the space multi-user, the system that makes can obtain the multiuser multiplexing gain on the space.

V-MIMO is actually a kind of space division multiple access and inserts (SDMA Space Division Multiple Access) method.From realizing angle, V-MIMO allows a plurality of users' (number of users≤base station is equipped with antenna number) that singly go into to have more (SIMO, Single-Input Multi-Output) to send data on same time.From realizing effect, V-MIMO is actually a plurality of user's data has been carried out multiplexing on the space, and has introduced the receive diversity gain at receiving terminal.

In addition, in senior Long Term Evolution (LTE-A, LTE Advanced), also support MIMO user to adopt the mode of operation of multi-user's multiple-input, multiple-output (MU-MIMO, Multi-User Multi-Input Multi-Output) on identical time, to send.

In order to bring into play the effect of MU-MIMO effectively, need the system can be according to loading condition, be chosen in single user's multiple-input, multiple-output (SU-MIMO, Single User Multi-Input Multi-Output)/switch between MU-MIMO and V-MIMO, to alleviate the excessive problem of load in the LTE up link, by making full use of space resources, obtain higher throughput of system.

At present, not relevant public technology provides the scheme that realizes that the defeated pattern of multi-antenna transmitting is selected between SU-MIMO/MU-MIMO and V-MIMO.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of method that realizes the defeated model selection of multi-antenna transmitting, can be chosen between SU-MIMO/MU-MIMO and V-MIMO and switch, and with by making full use of space resources, obtains higher throughput of system.

Another object of the present invention is to provide a kind of device of realizing the defeated model selection of multi-antenna transmitting, be chosen between SU-MIMO/MU-MIMO and V-MIMO and switch,, obtain higher throughput of system with by making full use of space resources.

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

A kind of method that realizes the defeated model selection of multi-antenna transmitting, this method comprises:

The base station determines that according to the system load amount needs carry out the switching of many antennas access module;

First user of base station selected virtual multiple-input, multiple-output V-MIMO pattern, and select the pairing user of V-MIMO pattern;

The base station sends control information to the pairing user who adopts the V-MIMO pattern.

This method also comprises and sets in advance load-threshold value; The switching that described definite needs carry out many antennas access module comprises:

The system load amount is learnt by detection in described base station, and in the system load amount that obtains during greater than default load-threshold value, determining needs to use the V-MIMO pattern.

First user of described V-MIMO pattern is the non real-time type service-user that needs transferring large number of data.

First user of described selection V-MIMO pattern comprises:

At first, though select the single user of configuration singly to go into to have more SU-SIMO or be furnished with 2 antennas and adopt first user of the user of SU-SIMO patterns as the V-MIMO pattern; Secondly, select to dispose double antenna and use first user of the user of single user's multiple-input, multiple-output SUMIMO pattern transmission data as the V-MIMO pattern.

First user of described V-MIMO pattern is at first for adopting the user of dblast time-code BLAST mode;

First user of described V-MIMO pattern is secondly for adopting the user of space-time block coding STBC or public number dictionary CDD mode.

First user of described base station selected V-MIMO pattern specifically comprises:

The user of requested service is carried out the calculating of service priority, and the user that priority is high is dispatched on time domain and the frequency domain resource earlier;

From the user who is assigned to resource, select first user of V-MIMO pattern, form first alternative user's set { k ₁, k ₂K _N.

Utilize poll or proportional dispatching algorithm to realize the calculating of described service priority.

The described method of selecting the pairing user of V-MIMO pattern from candidate user is: adopt and to match algorithm based on restricted normalization F norm user and select the pairing user of V-MIMO pattern.

Described employing is matched algorithm based on restricted normalization F norm user and is selected the pairing user of V-MIMO pattern specifically to comprise:

Unallocated user to resource is formed the candidate match user set { g ₁, g ₂G _M, for described first alternative user's set { k ₁, k ₂K _NIn certain user k _n, calculated candidate pairing user gathers { g respectively ₁, g ₂G _MIn each user g ₁, g ₂..., g _MWith this user k _nCorrelation factor

Wherein, n ∈ [1, N], m ∈ [1, M], n ' ∈ { k ₁Shared subcarrier };

Ask average mode by a plurality of subcarriers, calculate the pairing factor

Wherein, N ' is user k _nAnd g _mShared subcarrier, and work as

The time, judge the user and can match the V-MIMO pattern that forms; When The time, the user does not match, process ends; Wherein, ξ _ThresholdingBe default pairing associated gate limit value;

To matching the user who forms the V-MIMO pattern, if the user is g _mSatisfy:

N ' ∈ { k wherein ₁Shared subcarrier }, this user g then _mBe user k _nAlternative pairing user; Perhaps, if the user is g _mSatisfy: Wherein,

N ' ∈ { k ₁Shared subcarrier }, this user g then _mBe user k _nAlternative pairing user;

User k _nAlternative pairing user form user k _nAlternative pairing user set { p ₁, p ₂..., p _q, and according to

Determine user k _nPairing user p _Kn

Described pairing user p _KnUse antenna transmission data;

If described pairing user p _KnBe equipped with 2 antennas, this method also comprises:

Carry out a day line options in advance, select wherein 1 antenna transmission data;

Perhaps, 2 antennas are calculated respectively, select a more standard compliant antenna as the antenna that sends data.

Described control information comprises: current multi-antenna transmission mode, antenna selection mode, pilot frequency mode, and Space Time Coding pattern.

A kind of device of realizing the defeated model selection of multi-antenna transmitting comprises detection module, the first selection module, second selection module and the configuration module, wherein,

Detection module is used for determining that according to the system load amount needs carry out the switching of many antennas access module, the user profile that is assigned to resource is exported to first select module, unallocated user profile to resource is exported to second select module;

First selects module, is used for selecting from the user who is assigned to resource who receives first user of V-MIMO pattern, and first user that will select exports to the second selection module;

Second selects module, is used for from the user of the unallocated resource that receives, and selects the pairing user of the V-MIMO pattern of matching with first user, and successful user profile of matching is exported to configuration module;

Configuration module is used for sending its control information to the pairing user who adopts the V-MIMO pattern.

The technical scheme that provides from the invention described above as can be seen, system is according to loading condition, realized that multi-antenna transmitting fails the selection of pattern between SU-MIMO/MU-MIMO and V-MIMO.Brought into play the effect of MU-MIMO effectively, alleviated the excessive problem of load in the LTE up link,, obtained higher throughput of system by making full use of space resources.

Description of drawings

Fig. 1 realizes the flow chart of the method for the defeated model selection of multi-antenna transmitting for the present invention;

Fig. 2 realizes the composition structural representation of the device of the defeated model selection of multi-antenna transmitting for the present invention;

Fig. 3 realizes the flow chart of SU-SIMO/MIMO pattern to the embodiment of the switching of V-MIMO pattern for the present invention;

Fig. 4 is the schematic diagram of the control information of base station transmission among the present invention.

Embodiment

Fig. 1 is the flow chart that the present invention realizes the method for the defeated model selection of multi-antenna transmitting, as shown in Figure 1, comprising:

Step 100: the base station determines that according to the system load amount needs carry out the switching of many antennas access module.

Such as, the system load amount can be learnt by detection in the base station, and in the system load amount that obtains during greater than default load-threshold value, determines need carry out the multiuser MIMO transmission and promptly use the V-MIMO pattern.Wherein, how the base station detects the realization of learning the system load amount belongs to technology as well known to those skilled in the art, repeats no more here.

By this step, can see, when system business is not busy, when promptly system can satisfy the customer service request by the scheduling of time domain and frequency domain resource, do not use multi-user V-MIMO pattern.

Step 101: first user of base station selected V-MIMO pattern, and select the pairing user of V-MIMO pattern.

In this step, the user who can be used as first user of V-MIMO pattern can be: the non real-time type service-user that needs transferring large number of data.Select first user's method to be:

At first, selecting the user of configuration single antenna is that single user singly goes into to have more (SU-SIMO) though or be furnished with 2 antennas and adopt first user (latter here used a day line options technology) of the user of SU-SIMO pattern as the V-MIMO pattern.Secondly, selection is disposed double antenna and is used single user's multiple-input, multiple-output SU-MIMO pattern to send the user of data.

In above-mentioned this class user, at first select to adopt the user of dblast time-code (BLAST, Bell-Lab Layered Space Time Code) mode; Secondly, select to adopt the user of space-time block coding (STBC, Space Time Block Coding) or public number dictionary (CDD, Common Digital Dictionary) mode.In a single day these users are selected as first user of V-MIMO pattern, then need to adopt day line options choice of technology to send the antenna of data.

In this step, can adopt and match algorithm based on restricted normalization F norm user and select can the vide infra description of embodiment of the pairing user of V-MIMO pattern, specific implementation.

Step 102: the base station sends control information to the pairing user who adopts the V-MIMO pattern.

Control information can comprise: current multi-antenna transmission mode, antenna selection mode, pilot frequency mode, and information such as Space Time Coding pattern.

By the inventive method, system is according to loading condition, realized that multi-antenna transmitting fails the selection of pattern between SU-MIMO/MU-MIMO and V-MIMO.Brought into play the effect of MU-MIMO effectively, alleviated the excessive problem of load in the LTE up link,, obtained higher throughput of system by making full use of space resources.

Fig. 2 fails the composition structural representation of the device of model selection for the present invention realizes multi-antenna transmitting, and as shown in Figure 2, apparatus of the present invention comprise detection module, the first selection module, second selection module and the configuration module, wherein,

Detection module is used for determining that according to the system load amount needs carry out the switching of many antennas access module, the user profile that is assigned to resource is exported to first select module, unallocated user profile to resource is exported to second select module.

First selects module, is used for selecting from the user who is assigned to resource who receives first user of V-MIMO pattern, and first user that will select exports to the second selection module.

Second selects module, is used for from the user of the unallocated resource that receives, and selects the pairing user of the V-MIMO pattern of matching with first user, and successful user profile of matching is exported to configuration module.

Configuration module is used for sending its control information to the pairing user who adopts the V-MIMO pattern.

Fig. 3 realizes the flow chart of SU-SIMO/MIMO pattern to the embodiment of the switching of V-MIMO pattern for the present invention, and as shown in Figure 3, present embodiment comprises:

Step 300: the system load amount is learnt greater than default load-threshold value by detection in the base station, determines to use the V-MIMO pattern to certain customers.

Step 301: the user of requested service is carried out the calculating of service priority, and the user that priority is high is dispatched on time domain and the frequency domain resource earlier.

In this step, can utilize poll or dispatching algorithm such as proportional, the user of requested service be carried out the calculating of service priority, and it is extremely low from height according to priority, the user is dispatched on time domain and the frequency domain resource, promptly extremely low from height according to priority, be the user resource allocation of requested service.

Step 302: first user who from the user who is assigned to resource, selects the V-MIMO pattern.

In this step,, from the user who is assigned to resource, select the first alternative user of V-MIMO pattern, form first alternative user's set { k according to the method for selecting first user in the step 101 ₁, k ₂K _N.

Need to prove first alternative user's set { k ₁, k ₂K _NIn the user only be the first alternative user of V-MIMO pattern, whether it finally adopts V-MIMO mode transfer data, also needs further determining of step 303.First alternative user's set { k ₁, k ₂K _NIn the user represent one group of one group of user after the ordering, this ordering can be at random, also can be to arrange according to the backward of user's service priority, can also be other default ranking criteria.

Step 303: adopt and to match algorithm based on restricted normalization F norm user and select first user's of V-MIMO pattern pairing user.Promptly be followed successively by first alternative user's set { k ₁, k ₂K _NIn user k ₁, k ₂... k _NSeek the pairing user.

In the present embodiment, to select the pairing user of V-MIMO pattern be that example is described to match algorithm based on restricted normalization F norm user.

With the unallocated set { g that forms to the user of resource ₁, g ₂G _MBe called the candidate and match user set.Match user set { g from the candidate ₁, g ₂G _MThe middle first alternative user's set { k that selects ₁, k ₂K _NIn certain first user (be assumed to be user k _n, 1≤n≤N and n are integer) the pairing user comprise:

At first, calculate user g ₁, g ₂..., g _MWith user k _nCorrelation factor: Wherein, n ∈ [1, N], m ∈ [1, M], n ' ∈ { k _nShared subcarrier }, as shown in Equation (1):

With

Represent user k respectively _nAnd g _mAnd the channel between the base station.For multicarrier system, can ask average mode to calculate correlation factor by a plurality of subcarriers, as shown in Equation (2):

${\stackrel{\‾}{\mathrm{\ξ}}}_{k_n{g}_m}=\frac{1}{N^{\′}}\underset{n^{\′}=1}{\overset{N^{\′}}{\mathrm{\Σ}}}{\mathrm{\ξ}}_{n^{\′},k_n{g}_m}---\left(2\right)$

Wherein, N ' is user k _nAnd g _m(1≤n≤N, 1≤m≤M, and n, m are integer) shared subcarrier.Introduced pairing associated gate limit value ξ _Thresholding, regulation is worked as The time, the user can match the V-MIMO pattern that forms;

The time, the user does not match, process ends.Here, when interference between each subscriber channel is all bigger, just be not suitable for adopting the V-MIMO mode to send data, therefore the pairing factor established a threshold value, judge user's send mode according to threshold value.

Need to prove that formula (2) is that formula (1) is asked on average each subcarrier and obtained.

Then, carry out threshold judgement, specific implementation can have following dual mode:

First kind of mode: severe judgement award of bid standard.That is, if for user g _mSatisfy: N ' ∈ { k ₁Shared subcarrier } }, this user g then _mBe user k _nAlternative pairing user.

The second way: wide judgement standard.That is, if for user g _mSatisfy:

N ' ∈ { k ₁Shared subcarrier } }, this user g then _mBe user k _nAlternative pairing user.

Match user set { g by said method from the candidate ₁, g ₂G _MIn the user k that selects _nAlternative pairing user, form user k _nAlternative pairing user set { p ₁, p ₂..., p _q.

At last, if the user is k _nAlternative pairing user set be empty, then select and match the user

If the user is k _nAlternative pairing user set for empty, so, user k _nDo not adopt the V-MIMO pattern, still use original mode transfer data.

Match user set { g from the candidate ₁, g ₂G _MIn the user that matched of eliminating, again from residue pairing user set, the method for the pairing user by above-mentioned selection first user is first alternative user's set { k ₁, k ₂K _NIn also do not carry out the user that chooses of pairing user and selected to match the user.

As first alternative user's set { k ₁, k ₂K _NIn all users, or the candidate matches user set { g ₁, g ₂G _MIn all users all carried out above-mentioned selection first user's pairing user's step after, finish this step.

Need to prove, in case the candidate matches user set { g ₁, g ₂G _MIn certain user be selected as the pairing user of V-MIMO pattern, then can only use antenna transmission data.For those users that are equipped with 2 antennas, two kinds of antenna preference patterns are arranged:

Pattern 1: carry out a day line options in advance, select and send the antenna that data are used.

Pattern 2: 2 antennas are all carried out corresponding calculated, select more standard compliant that antenna as the antenna that sends data.Wherein, the corresponding calculated that antenna is carried out belongs to technology as well known to those skilled in the art, selects certain antenna to calculate correlation factor respectively according to above-mentioned formula (1) or (2) as the user

Select that little root antenna of correlation factor as the antenna that sends data, perhaps respectively to every antenna calculating channel capacity, selective channel that root antenna capacious is as the antenna that sends data.

Step 304: the base station sends control information to the pairing user.

Fig. 4 as shown in Figure 4, in order to simplify description, only relates to the control information about switch mode for the schematic diagram of the control information of base station transmission among the present invention in the control information, comprising:

The 1st: current multi-antenna transmission mode position.0 expression SU-SIMO/MIMO pattern; 1 expression V-MIMO pattern.

The 2nd～3: antenna selection mode position.00 expression base station end does not consider which root antenna the user uses carry out data and send, and the antenna selection course is determined by the user; Perhaps the user has only disposed 1 transmit antennas; 01/10 expression base station notifies the user to use given antenna to carry out transfer of data; 11 expression users use 2 antennas to carry out transfer of data.

The 4th～5: the pilot frequency mode position, undetermined.

The 6th～8: Space Time Coding pattern position.Space Time Coding is not carried out in 000 expression; 001 expression STBC coding; 010 expression SFBC coding; 011 expression CDD coding; 100 expression VBLAST codings.Wherein, of particular note, when being 1 for the 1st,, then be considered as 00 if a day line options position is 11; If Space Time Coding position right and wrong 000 then are considered as 000.

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, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims (12)

1. method that realizes the defeated model selection of multi-antenna transmitting is characterized in that this method comprises:

The base station determines that according to the system load amount needs carry out the switching of many antennas access module;

First user of base station selected virtual multiple-input, multiple-output V-MIMO pattern, and select the pairing user of V-MIMO pattern;

The base station sends control information to the pairing user who adopts the V-MIMO pattern.

2. method according to claim 1 is characterized in that, this method also comprises and sets in advance load-threshold value; The switching that described definite needs carry out many antennas access module comprises:

The system load amount is learnt by detection in described base station, and in the system load amount that obtains during greater than default load-threshold value, determining needs to use the V-MIMO pattern.

3. method according to claim 1 is characterized in that, first user of described V-MIMO pattern is the non real-time type service-user that needs transferring large number of data.

4. method according to claim 3 is characterized in that, first user of described selection V-MIMO pattern comprises:

At first, though select the single user of configuration singly to go into to have more SU-SIMO or be furnished with 2 antennas and adopt first user of the user of SU-SIMO patterns as the V-MIMO pattern; Secondly, select to dispose double antenna and use first user of the user of single user's multiple-input, multiple-output SU-MIMO pattern transmission data as the V-MIMO pattern.

5. method according to claim 4 is characterized in that, first user of described V-MIMO pattern is at first for adopting the user of dblast time-code BLAST mode;

First user of described V-MIMO pattern is secondly for adopting the user of space-time block coding STBC or public number dictionary CDD mode.

6. method according to claim 5 is characterized in that, first user of described base station selected V-MIMO pattern specifically comprises:

The user of requested service is carried out the calculating of service priority, and the user that priority is high is dispatched on time domain and the frequency domain resource earlier;

From the user who is assigned to resource, select first user of V-MIMO pattern, form first alternative user's set { k ₁, k ₂K _N.

7. method according to claim 6 is characterized in that, utilizes poll or proportional dispatching algorithm to realize the calculating of described service priority.

8. method according to claim 6 is characterized in that, the described method of selecting the pairing user of V-MIMO pattern from candidate user is: adopt and to match algorithm based on restricted normalization F norm user and select the pairing user of V-MIMO pattern.

9. method according to claim 8 is characterized in that, described employing is matched algorithm based on restricted normalization F norm user and selected the pairing user of V-MIMO pattern specifically to comprise:

Unallocated user to resource is formed the candidate match user set { g ₁, g ₂G _M, for described first alternative user's set { k ₁, k ₂K _NIn certain user k _n, calculated candidate pairing user gathers { g respectively ₁, g ₂G _MIn each user g ₁, g ₂..., g _MWith this user k _nCorrelation factor

Wherein, n ∈ [1, N], m ∈ [1, M], n ' ∈ { k ₁Shared subcarrier };

Ask average mode by a plurality of subcarriers, calculate the pairing factor

Wherein, N ' is user k _nAnd g _mShared subcarrier, and work as

The time, judge the user and can match the V-MIMO pattern that forms; When

The time, the user does not match, process ends; Wherein, ξ _ThresholdingBe default pairing associated gate limit value;

To matching the user who forms the V-MIMO pattern, if the user is g _mSatisfy:

N ' ∈ { k wherein ₁Shared subcarrier }, this user g then _mBe user k _nAlternative pairing user; Perhaps, if the user is g _mSatisfy: Wherein,

N ' ∈ { k ₁Shared subcarrier }, this user g then _mBe user k _nAlternative pairing user;

User k _nAlternative pairing user form user k _nAlternative pairing user set { p ₁, p ₂..., p _q, and according to

Determine user k _nPairing user p _Kn

10. method according to claim 9 is characterized in that, described pairing user p _KnUse antenna transmission data;

If described pairing user p _KnBe equipped with 2 antennas, this method also comprises:

Carry out a day line options in advance, select wherein 1 antenna transmission data;

Perhaps, 2 antennas are calculated respectively, select a more standard compliant antenna as the antenna that sends data.

11. method according to claim 1 is characterized in that, described control information comprises: current multi-antenna transmission mode, antenna selection mode, pilot frequency mode, and Space Time Coding pattern.

12. a device of realizing the defeated model selection of multi-antenna transmitting is characterized in that, comprises detection module, the first selection module, second selection module and the configuration module, wherein,

Detection module is used for determining that according to the system load amount needs carry out the switching of many antennas access module, the user profile that is assigned to resource is exported to first select module, unallocated user profile to resource is exported to second select module;

First selects module, is used for selecting from the user who is assigned to resource who receives first user of V-MIMO pattern, and first user that will select exports to the second selection module;

Second selects module, is used for from the user of the unallocated resource that receives, and selects the pairing user of the V-MIMO pattern of matching with first user, and successful user profile of matching is exported to configuration module;

Configuration module is used for sending its control information to the pairing user who adopts the V-MIMO pattern.

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