Method for communication in mimo network

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to wireless communication using a multiple-user multiple input, multiple output (MU-MIMO) system and discloses a method for communication in a network including a primary station and at least a first secondary station, wherein the first secondary station transmits to the primary station an indication of a first set of precoding vectors, and the number of first precoding vectors is greater than a preferred rank of transmission from the primary station to the first secondary station.

EFFECT: improved communication.

17 cl, 2 dwg

 

The technical field to which the invention relates

The present invention relates to a communication method in a communication network. More specifically the present invention relates to a method of communication between the primary station and one or more secondary stations in the MIMO (multiple inputs and multiple outputs). The present invention also relates to the primary stations and secondary stations, which can implement this method.

In particular, the present invention is relevant to all wireless networks, and, in the following description, a mobile telecommunications network, such as UMTS or LTE.

Prior art inventions

To increase available bandwidth in communication networks has been widely presented system is MIMO (multiple inputs and multiple outputs). To improve the efficiency of communication in the MIMO system, both transmitter and receiver use multiple antennas. Of course, this system provides a significant increase in throughput without additional bandwidth or transmit power through higher spectral efficiency (more bits per second per Hertz of bandwidth) and reliability of the communication line.

The multiplayer system is EMA MIMO (MU-MIMO) is an improved MIMO system, which station provides simultaneous communications with multiple users in one lane. In the illustrative embodiment of the invention, the mobile communications network comprises a primary station (base station or Node B (NodeB) or an enhanced Node B (eNodeB), which can communicate simultaneously with multiple secondary stations (mobile stations or subscriber equipment or UE) using MIMO streams through multiple antennas primary stations and multiple antennas secondary stations. For the formation of secondary flow stations provide primary station information associated with the state of the channel through the transmission of feedback of CSI information (information about the state of the channel) at the primary station. Such information CSI indicates the optimal or, at least, preferred to use a vector of pre-coding to maximize available data rate of the respective spatially separated data streams transmitted by the primary station. This vector pre-coding can be a set of values that will be applied to each antenna input of the primary station in the transmission direction of data flow on the antenna Deuteronomy is cnyh stations.

However, the use of signaled vector pre-coding system MU-MIMO may cause interference beam from another secondary station, which at that time communicates with the primary station. In addition, the secondary station will not be able to assess where the interfering station, and does the use of the vector pre-coding interference. Share vectors pre-coding, transmitted through the secondary stations, each secondary station will lead to excessive signaling, as well as requiring excessive power calculate each secondary station for forming does not create interference vectors pre-encoding.

The invention

The purpose of the invention is to provide an improved communication method in a network MU-MIMO, which resolves the aforementioned problems.

Another object of the invention is to provide means of communication, which does not lead to excessive signaling, but improves the quality of the channel by reducing the interference.

Another objective of the invention consists in the representation of a system comprising a primary station and a secondary station, which can maximize the throughput of the entire system.

For this purpose, in accordance with one aspect the invention, we propose a method of transmitting information in a network that includes a primary station and at least a first secondary station, in which the first secondary station transmits to the primary station, the indicator of the first set of vectors pre-encoding, and the number of first vectors pre-coding more preferred rank of the transmission from the primary station to the first secondary station.

Under the rank transmission is the number of spatially separated data streams in the MIMO system between the primary station and a particular secondary station. It should be noted that the rank cannot exceed the minimum number of antennas of the primary station and secondary station. For example, the secondary station having four antennas will not be able to take more than four spatially separated flows, so the rank of the connection does not exceed a value of 4. In addition, the primary station having sixteen antennas will not be able to transmit more than 16 rays. As an example, such a primary station can simultaneously transmit four MIMO transmission rank 4 four secondary stations, or a single MIMO transmission rank 4 on one secondary station along with two MIMO transmission rank 2 on the other two secondary stations and eight MIMO transmission rank 1 on eight other secondary stations.

As a consequence, the PE the primary station can generate another vector of pre-encoding, for example, based on a linear combination of a set of vectors, marked for communication. In the embodiment, the MU-MIMO primary station can generate a vector of pre-coding, which from the point of view of the secondary station may be close to optimal, but it does prevent interference between streams transmitted on different secondary stations. In a specific embodiment, the primary station selects a combination of vectors pre-coding, such a linear combination, which does not require much processing, so that the total transmission rate of all the transmission speeds of the United secondary stations was maximum.

In accordance with another aspect of the invention presents a secondary station which includes means for network communication with a primary station, the secondary station further comprises a transmission medium designed to transmit the indicator of the first set of vectors pre-coding on the primary station, and the number of first vectors pre-coding more preferred rank of the transmission from the primary station to the first secondary station.

These and other aspects of the invention will become apparent from and will be identified with reference to the following options for implementation.

Hereinafter the present invention will be described in more detail with illustrative reference to the accompanying drawings, which depict the following:

Figure 1 depicts a block diagram of a network in accordance with the scheme of forming a beam pattern that maximizes the transmission rate of one secondary station;

Figure 2 depicts a block diagram of a network in accordance with the embodiment of the invention.

Detailed description of the invention

The present invention relates to a communication network comprising a primary station and multiple secondary stations, which communicate with the primary station. For example, such a network is illustrated in figure 1 and 2, where the primary station or the base station 100 communicates through a wireless network with multiple secondary stations 101, 102, 103 and 104. In the illustrative example of the invention the secondary stations 101-104 are mobile stations or subscriber equipment UMTS network.

In accordance with the first embodiment of the invention, the primary station 100 has an antenna grid containing multiple antennas, and integrated amplifier voltage to the primary station 100 can perform the formation of a beam pattern that is similar to the formation of a beam pattern of MIMO. Typically, the primary station and eat four antennas. In the most advanced versions of LTE primary station can have 8, 16 or more antennas. Similarly, the secondary stations 101-104 have multiple antennas, for example 2 antennas for equipment UE that is compatible with the first version of LTE. In later versions, the secondary station can have 4, 8 or more antennas. Due to antenna arrays, the primary station 100 can generate beams of data streams, similar to the beams 150 and 151, shown in figure 1. For beam forming and MIMO communication it is necessary to form the vectors pre-coding, and for this formation requires information about the state of the channel and calculating as on the side of the secondary station and the primary station.

For example, in the first version of the LTE specifications secondary station configured to receive transmissions on the downlink in the system MU-MIMO, perform measurements of the downlink (usually using common reference signals without prior coding (CRS)), and transmit feedback information about the channel state (CSI) at the primary station eNodeB. It indicates preferred to use a vector of pre-coding for transmission on the downlink (indicator matrix pre-coding (PMI)and the associated CQI value (information about the quality of the channel, indicating for the expansion of modulation scheme and coding. In this example, transmission in downlink based on the code book that says that is used to transmit vectors pre-coding is selected from a finite set. The selected vector pre-coding is signaled to the secondary station to the secondary station can obtain the reference phase as the corresponding linear combination of the common reference signals (CRS).

The secondary station with one receiving antenna transmits feedback the index of one preferred vector pre-coding, which makes possible the transmission from the best quality or the most reliable transmission, for example, that maximizes its antenna signal-to-noise ratio (SINR). It may be based on pre-defined code book vectors forming the beam pattern transfer or direct quantization of the vector channel (CVQ). If the secondary station has two or more receiving antennas, the situation is more complicated, and the approach taken depends on the size of the code book that is available for transmission over the feedback of the quantized information CSI. What should be done in such a secondary station is transmitting on the reverse link of the full channel matrix (or, at least, its quantized version). However, this satr which require substantial service alarm and significant resources.

In the case of transmission of rank 2 can be sent via the feedback preferred matrix pre-coding. However, it is unsuitable for cases where the secondary station prefers the use of transmission of rank 1, for example, because of the limited rank matrix channel, when the secondary station is configured in MIMO mode, which supports only the transmission of rank 1, or when the primary station plans exclusively to the transmission rank 1.

As for the transmission of rank 1, with relatively small codebook feedback secondary station with two receiving antennas, it is advisable to determine a preferred vector of the pre-coding by obtaining the vector combining technique, which maximizes the ratio of the SINR for each vector beam forming pattern transfer in the code book. Typically, this preferred vector pre-coding can be a vector of the Association receive MMSE (minimum mean square estimation). Equipment UE may report the vector beam forming pattern transfer, which maximizes the ratio of the SINR.

For one thread to one secondary station this approach can be expressed as follows:

1. The received signal viragoes is as y=Hgx+n

where y is the received signal vector Nx1,

x is the transmitted signal vector 1x1,

g - vector of pre-encoding, Mx1,

H is the channel matrix, NxM,

n is the noise at each reception antenna, the Nx1 vector.

For convenience, H can be normalized to the noise differences were equal.

M is the number of transmit antennas at the eNB,

N is the number of receiving antenna at the UE,

2. For each possible g in the code book of size C calculates the weight vector w (1xN) receiving antenna, so that wy=x minimize the error E[x-x], that is:

w=(Hg)H((Hg)(Hg)H2I)-1.

3. Reported g that maximizes the ratio of the SINR, after computing the corresponding MMSE solution for the vector w. This is equivalent to message g to one receiving antenna, where g is chosen to maximize the accepted relationship for the effective SINR of the transmission channel Hm expressed by wH.

4. The eNB scheduler selects a couple of instances of equipment UE that tell orthogonal g (or, at least, g with low cross-correlation).

In the case of feedback based on vector quantization of the channel (CVQ) a similar approach can lead to one preferred vector pre-coding feedback. However, this depends on the assumption that the formation of the beam pattern is performed in predecisional station, and get closer to the actual relationship SINR.

The main drawback of the above approaches is that they do not maximize the total transmission rate in a cell using MU-MIMO, since by the choice of w, which allows different mating instances of equipment UE, but not maximizes the ratio of the SINR for each individual UE, can be achieved a higher overall transmission speed.

This can be illustrated in figure 1 through the beam 151 sent from the primary station 100 to the secondary station 101. Even if the beam 151 is a beam that maximizes the ratio of the SINR secondary station 101, it causes great interference on the secondary station 102. This secondary station 102 will not be able to communicate with a high ratio SINR due to the fact that the beam 151 is directed straight at her.

In addition, in some cases, it is impractical for the secondary station to calculate a single weight vector w that optimizes the ratio of the SINR, and hence, it is impractical to send feedback on a preferred vector of the pre-transfer encoding. Such cases include:

i) the case of a large code book feedback, in which a number of different optimizations and calculations relations SINR becomes excessive;

ii) cases in which W is the hexadecimal format of the station is not a known vector of pre-transfer encoding.

a. The formation of the beam of the directional diagrams of transmission to the primary station, where the reference phase is expressed through a pre-coded reference signals instead of CRS and indicator actually used vector pre-encoding; in this case, there are effectively an infinite number of available vectors pre-transfer encoding, for each of which the secondary station must obtain the optimal weight vector w;

b. feedback based on vector quantization of the channel when the assumption about the formation of the beam of the directional diagrams of the transmission zero may not necessarily be invalid.

One aspect of the invention is based on the fact that for the above-mentioned cases, it is possible a large number or even an infinite number w. This means that by changing w base station will be able to choose a couple of instances of equipment UE that maximize the total transmission rate, while maximising the transfer rate for any specific equipment UE is not required.

Illustrative variant of the first variant embodiment of the invention shown in figure 2, where the primary station 100 can direct the beam 151 so that it does not interfere with the secondary station 102. Even if the beam 151 does not provide Maxim is Ino possible values relationships SINR for the secondary station 101, the total transmission rate, which achieve for all secondary stations may be higher due to the secondary station 102 does not interfere with the beam 151 allocated to the other secondary stations, namely station 101.

To achieve such a result, in accordance with the first embodiment of the invention, it is assumed that the secondary station transmits feedback to the primary station a set of preferred vectors pre-coding, and the number of vectors pre-coding more preferred rank transmission. The primary station may determine a first preferred rank of the transfer and pre-configure the secondary station. It then allows informing secondary station on the number of required vectors pre-coding, which must be passed on the feedback to the primary station. It also solves the limitation of the computing requirements at the secondary station, which may be more limited compared to the computing power of the primary station.

However, it is possible to allow the secondary station is the preferred rank of the transmission depending on the state of the channel in such a way to allow optimal use of the channel. In this case, the secondary station signals p is Rechnoy station the preferred rank of the transfer.

In accordance with the first embodiment in the case of secondary stations or equipment UE two receiving antennas in the LTE network, each instance of the UE returns two vectors g1 and g2 pre-coding, even if the preferred transmission rank 1. Each vector g pre-encoding can be calculated by the above method, by selecting two preferably orthogonal vectors w1 and w2 receiving,who are famous or have a relationship that is known, it is possible a priori as the primary station and secondary station.

In accordance with a preferred embodiment of the first vector w1 receivingis calculated to maximize speed transmission for feedback approach based on the code book, as described above. The corresponding CQI value calculated using this value w,also passed on the feedback that provides sufficient information when no other secondary station at the same time not scheduled transmission. Then as orthogonal vectors w1,can be selected a second vector w2 (which provides sufficient information for the optimal planning another secondary station), and can also be calculated and passed to inverse the Oh connection, the second CQI value for this value of w. The secondary station transmits feedback corresponding values g1 and g2.

For two receiving antennas at the secondary station suitable alternative implementation may use the vectors w1=[1 1] and w2=[1-1] or [0 1] and [1 0], corresponding to the choice of the receiving antenna.

It should be noted that this illustrative variant implementation of the invention can be extended to the secondary station with N receiving antennas, then w is a vector of size 1xN. In this case, the secondary station can transmit feedback preferred vector pre-coding, the corresponding N vectors w. For example, if N=4, the secondary station can transmit feedback 4 preferred vector pre-coding corresponding to the vectors w1, w2, w3 and w4, each of which may be orthogonal to each other.

In accordance with a variant of the above example, the secondary station may send a reduced number of transmission on the feedback that is less than N vectors w. In this case (for example, for 2 vectors w) when selecting a specific vectors w can be taken into account correlation between receiving antennas to maximize the transmission of feedback information to the primary station.

For example, the choice of the vector w1 to maximize transfer speed possible majitel the mi for the formation of the vectors w2, w3, w4 will be[1 1 -1 -1], [1 -1 1 -1] and [1 -1 -1 1]. When using the vector w2 is likely that vector w3 or w4 is preferably (i.e. will provide eNodeB more information) to assume that the antennas are indexed in the order of the separation (and hence correlation).

Therefore, as an additional aspect of the invention, a secondary station selects a second vector w in accordance with the correlation between antennas (since the primary station does not need to know the relationship between the index of the antenna and the physical antenna on a secondary station).

In another embodiment, the secondary station selects and transmits feedback n vectors w, which have the highest ratio of SINR, where n<N.

As an additional example, if the vector w1 is selected as [1 1 1 1], the possible values for the vectors w2, w3 and w4can be[1 1 -1 -1], [1 -1 1 -1] and [1 -1 -1 1].

In the embodiment where N=2, the scheduler the primary station is released for any gAfor user a as a linear combination of g1 and g2, which are orthogonal gAand also received gBfor user B. This can be extended to N>2, where the secondary station reports two (or more) values of g, and eNB applies pre-coding, which is a linear combination of soobsheni the values.

If the secondary station reported N values of g corresponding to N values of w,what eNB provides some information about the overall channel matrix. However, this method has a few advantages over the known methods, because there is no need to identify the order receiving antennas, and the computational complexity are likely to be reduced for equivalent accuracy of the representation of the channel (i.e., N searching a codebook of size C in comparison with one search a codebook of size CN).

In a variant of the invention the primary station is a mobile terminal, such subscriber equipment, and the primary station is the base station that is similar to the eNodeB.

The invention can be applied to mobile telecommunications systems, such as UMTS, LTE and UMTS, LTE advanced, and, in some embodiments, to any communication system having a distribution of resources that will be performed dynamically or at least almost continuously.

In this specification and the claims singular element does not exclude the presence of many such elements. In addition, the word "comprising" does not exclude the presence of other elements or steps other than those listed.

Conclusion reference numbers in parentheses in the claims is intended for the marketer to understand, and not for purposes of limitation.

After reading the present disclosure specialists in the art will become apparent other modifications. Such modifications may involve other distinctive signs, which are already known in the prior art radio communication.

1. Way communication network, the said network includes a primary station and at least a first secondary station, in which the first secondary station transmits to the primary station, the indicator of the first set of vectors pre-coding, and the number of first vectors pre-coding more preferred rank of the transmission from the primary station to the first secondary station.

2. The method according to p. 1, in which the preferred rank transmission is signaled to the primary station by the first secondary station.

3. The method according to claim 1, in which the preferred rank of the transmission is configured by the primary station.

4. The method according to claim 1, in which the preferred rank of the transmission is determined in advance.

5. The method according to any one of claims 1 to 4, in which the first secondary station receives each vector pre-coding the first set in accordance with the excellent corresponding vector combining reception.

6. The method according to claim 5, in which the vectors Association reception are orthogonal and each other.

7. The method according to claim 5, in which the indicator transmission rate achievable at least one vector of pre-coding the first set and the corresponding vector combining reception is transmitted to the primary station.

8. The method according to claim 5, in which the indicators transmission speed attainable with each of the vectors pre-coding the first set and their corresponding vectors Association reception is transmitted to the primary station.

9. The method according to any one of claims 1 to 4, in which the number of first vectors pre-coding is less than the number of receiving antennas of a secondary station.

10. The method according to claim 9, in which the secondary station selects the first vectors of the pre-coding depending on at least one of correlation between a reception antenna of a secondary station and a corresponding relationship SINR for each vector pre-encoding.

11. The method according to any one of claims 1 to 4, optionally containing phase in which the primary station selects the first vector preview-transfer-encoding based on the combination of the first vector for pre-coding the first set.

12. The method according to claim 11, in which the said stage further comprises a stage on which the choice of the second vector preview-transfer-encoding based on the combination of Deut the x vectors pre-coding of the second set of vectors pre-encoding, the second set is indicated by the second secondary station, and the first vector of pre-coding transmission and the second vector preview-transfer-encoding chosen so that the total transmission rate the transmission rate of the first secondary station and a transfer rate of the second secondary station was the maximum.

13. The method according to item 12, in which the first vector of pre-coding transmission and a second vector of pre-coding transmission are essentially orthogonal.

14. The method according to any one of claims 1 to 4, in which each vector preview-transfer-encoding is a linear combination of vectors of the preliminary encoding of the corresponding set.

15. The secondary station containing means for network communication with a primary station, the secondary station further comprises a transmission medium, which is intended for transmission of the indicator of the first set of vectors pre-coding on the primary station, and the number of first vectors pre-coding more preferred rank of the transmission from the primary station to the first secondary station.

16. The primary station that contains a tool for communication in the network, at least one secondary station, the primary station further comprises Wed the rotary reception designed for reception of the indicator of the first set of vectors pre-coding at least one secondary station, and the number of first vectors pre-coding more preferred rank of the transmission from the primary station to the first secondary station, and a management tool that is designed to select the first vector preview-transfer-encoding based on the combination of the first vector for pre-coding the first set.

17. The system that contains the primary station in article 16, and at least one secondary station 15.



 

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55 cl, 3 dwg, 1 tbl

FIELD: physics.

SUBSTANCE: invention is related to device and method for beams shaping in telecommunication system of mobile communication CDMA with application of intellectual antennas technology, using specified device and method, multiple fixed beams are shaped in sector, and multiple fixed beams are used to shape traffic channel with narrow beams and common channel with sector beams in one and the same intellectual antenna system, and problem of phases discrepancy is solved in appropriate channels due to differences in time and temperature oscillations without application of complicated correcting technology. Since fixed beams in some area correlate and interact with each other, or considerably weaken due to correlative summation of space vectors of every fixed beam in process of common channels transfer in CDMA system with multiple antennas, then appropriate ratio is established between power of pilot channel and traffic channel in coverage area, and signal-noise ratio is increased for signals received by mobile communication station. As a result of addition of optical transceivers system between system of the main frequency band and system of radio frequency transceivers (TRX), the main frequency band system services more sectors. Radio frequency unit is located in close proximity to antennas, and consumed power is reduced accordingly.

EFFECT: increased throughput capacity and efficiency of CDMA system with multiple antennas.

15 cl, 6 dwg

FIELD: information technologies.

SUBSTANCE: separation of transmitting antennas with feedback is applied to special channel of downstream communications line, and separation of transmitting antennas without feedback is applied to control channel of downstream communications line in accordance with high-efficiency method of transmission over upstream communications line. The objective of present invention is to determine how the station with separation during transmission which implements advanced upstream communications line (EUL) should apply separation of transmitting antennas to level 1 confirmation information transmission channels (E-HICH), relative transmission rate channels (E-RGCH) and absolute transmission rate channels (E-AGCH).

EFFECT: providing communications system stability and reliability.

9 cl, 15 dwg

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