KR20180127867A - Dynamic multiplexing device and dynamic multiplexing control method - Google Patents

Abstract

The present invention relates to a dynamic multiplexing apparatus capable of consistently and optimally ensuring network performance, stability and service quality by dynamically changing output (signal transmission strength) for each antenna port and multiplexing method (1 : N) in a direction of optimizing network performance in a MIMO system, and a dynamic multiplexing control method. The dynamic multiplexing apparatus comprises: a collection part; a transmission strength optimization part; and a multiplexing part.

Description

[0001] DYNAMIC MULTIPLEXING DEVICE AND DYNAMIC MULTIPLEXING CONTROL METHOD [0002]

The present invention relates to a technique capable of dynamically changing a signal transmission intensity and a multiplexing scheme for each antenna port in a direction of optimizing network performance in an environment of transmitting and receiving signals through a plurality of antennas (ports).

In a multi-antenna system (hereinafter referred to as a MIMO system) for transmitting and receiving signals through a plurality of antennas (ports), various data layers are generated for increasing the capacity of the network, and mapping and precoding And precoding, and signals are output through the respective logical antenna ports. Signals of the respective logical antenna ports are mapped to the respective physical antenna ports and transmitted to the radio environment.

Assuming that four physical antennas (ports) are provided on the transmission apparatus side and four physical antennas (ports) are provided on the reception apparatus side as shown in FIG. 1, the following description will be made.

The transmitting apparatus side signal processing section 10 generates a plurality of data layers and performs a signal processing process such as mapping and precoding application of each data layer so that each of the four logical antenna ports Ant # 0, # 1, # 2 And # 3, and the signals of the respective logical antenna ports are transmitted to the radio environment through the mapped physical antenna ports Tx # 0, # 1, # 2, and # 3.

In this conventional MIMO system, the outputs (signal transmission intensities) of each of the antenna ports Tx # 0, # 1, # 2 and # 3 are uniformly fixed / operated and each logical antenna port is connected to each physical antenna port 1: 1 and the signal is transmitted.

In the MIMO system, there may be differences in signal magnitude (intensity) between the respective radio paths (hereinafter referred to as Paths) in terms of the transmit / receive antenna ports due to the physical radio environment.

In the conventional MIMO system, since the outputs (signal transmission intensities) of the antenna ports Tx # 0, # 1, # 2 and # 3 are uniformly fixed / operated, There is a problem that network performance and stability are degraded.

In addition, in the conventional MIMO system, each logical antenna port is mapped to each physical antenna port in a 1: 1 mapping so that a signal is transmitted. Therefore, even if a specific antenna port fails and signal transmission becomes impossible, there is a problem.

Therefore, in the present invention, a method of dynamically changing output (signal transmission intensity) and multiplexing scheme (1: N) for each antenna port is proposed from the viewpoint of optimizing network performance.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to dynamically change output (signal transmission intensity) and multiplexing scheme (1: N) for each antenna port from the viewpoint of optimizing network performance And to realize a plan that can be implemented.

According to a first aspect of the present invention, there is provided a dynamic multiplexing apparatus including: a collecting unit collecting performance information related to network performance; A transmission strength optimizer for performing an optimization operation for changing a signal transmission intensity based on the performance information for each of a plurality of antenna ports and re-changing a signal transmission strength according to whether the network performance is improved before the change; And a multiplexing unit for determining a multiplexing method for transmitting a signal through the plurality of antenna ports based on the performance information after the intensity of signal transmission for each antenna port is determined according to optimization performed for each of the plurality of antenna ports, .

Preferably, each time the performance information is collected, the quality information generated based on the collected performance information and the performance information may include at least one of a signal transmission intensity for each antenna port at the collection time at which the performance information is collected, And a storage unit for storing a data set in which at least one of the methods is mapped.

Preferably, the transmission strength optimizer searches the pre-stored data set for a data set having the highest similarity to the current signal strength of the antenna port and the current performance information collected by the collecting unit, for each of the plurality of antenna ports, For each of the plurality of antenna ports, a current signal transmission intensity of the antenna port to a signal transmission intensity of the antenna port in a data set having a quality value higher than a quality value generated based on the current performance information among the searched data sets have.

Preferably, the transmission intensity optimizing unit optimizes the quality of the data set in the data set immediately before the change based on the performance information collected by the collecting unit after changing the signal transmission intensity of the antenna port for each of the plurality of antenna ports, And if the quality value after change is higher than the quality value immediately before the change, it is determined that the network performance is improved from before the change, and the signal transmission The intensity can be determined as the changed signal transmission strength.

Preferably, the multiplexing unit changes the multiplexing scheme for the plurality of antenna ports based on the signal transmission strength for each antenna port determined by the optimization operation performed for each of the plurality of antenna ports and the performance information, It is possible to perform a multiplexing optimization operation for re-changing the multiplexing scheme depending on whether the performance is improved before the change.

Preferably, the multiplexing unit searches the pre-stored data set for a data set having the highest degree of similarity to the signal strength for each antenna port and the current performance information collected by the collecting unit, May be changed to a multiplexing scheme in a data set having a quality value higher than a quality value generated based on the current performance information among the searched data sets.

Preferably, the multiplexing unit checks whether the quality value generated based on the performance information collected by the collecting unit after changing the multiplexing scheme is higher than the quality value in the data set just before the change, Is higher than the quality value just before the change, it is determined that the network performance is improved before the change, and the multiplexing scheme according to the optimization operation can be determined as the post-change multiplexing scheme.

Preferably, the multiplexing scheme is based on a multiplexing matrix selected by the multiplexing unit, and the multiplexing matrix includes a mapping scheme for transmitting a signal of one logical antenna port through a plurality of antenna ports of the plurality of antenna ports A matrix element arrangement type predefined such that the signals can be transmitted through mutually orthogonal antenna ports and a matrix element arrangement type in which the total transmission strength of a signal transmitted through the plurality of antenna ports is And may have predefined weights for each matrix element that are predefined to be maximally accommodated within the limited total power strength.

Advantageously, the signal transmission intensity optimization operation for each of the plurality of antenna ports may be performed at predetermined optimization cycles or at the occurrence of a specific event in which the network performance is rapidly changed.

According to a second aspect of the present invention, there is provided a dynamic multiplexing control method including: a collection step of collecting performance information related to network performance; A transmission intensity optimizing step of performing an optimizing operation for changing a signal transmission intensity based on the performance information for each of a plurality of antenna ports and re-changing a signal transmission strength depending on whether the network performance is improved before changing after the change; And a multiplexing step of determining a multiplexing scheme for transmitting a signal through the plurality of antenna ports based on the performance information after determining an intensity of signal transmission for each antenna port by optimization performed for each of the plurality of antenna ports .

Preferably, the multiplexing step changes the multiplexing scheme for the plurality of antenna ports based on the signal transmission strength for each antenna port determined by the optimization operation performed for each of the plurality of antenna ports and the performance information, It is possible to perform a multiplexing optimization operation for re-changing the multiplexing scheme depending on whether the network performance is improved before the change.

Thus, according to the dynamic multiplexing apparatus and the dynamic multiplexing control method of the present invention, by changing the output (signal transmission intensity) and the multiplexing scheme (1: N) for each antenna port in the direction of optimizing the network performance in the MIMO system, It is possible to consistently guarantee not only the performance but also the stability and the service quality in an optimum manner.

1 is an exemplary diagram illustrating a mapping relationship between a logical antenna port and a physical antenna port in a conventional MIMO system.
2 is an exemplary diagram of a MIMO system to which the dynamic multiplexing apparatus of the present invention is applied.
3 is a diagram illustrating a mapping relationship between a logical antenna port and a physical antenna port in a MIMO system to which the dynamic multiplexing apparatus of the present invention is applied.
4 is a flow chart illustrating the dynamic multiplexing control method of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

First, the problems of the existing MIMO system related to the present invention will be briefly described with reference to FIG.

Fig. 1 shows a MIMO system in which it is assumed that four physical antennas (ports) are provided on the transmission apparatus side and four physical antennas (ports) are provided on the reception apparatus side.

1, according to the conventional MIMO system, the transmitter-side signal processing unit 10 generates a plurality of data layers, performs a signal processing process such as mapping and precoding of each data layer, And outputs signals through the four logical antenna ports Ant # 0, # 1, # 2 and # 3. The signal of each logical antenna port is transmitted to each of the mapped physical antenna ports Tx # 0, # 1, # 2, # 3) to the wireless environment.

In this conventional MIMO system, the outputs (signal transmission intensities) of each of the antenna ports Tx # 0, # 1, # 2 and # 3 are uniformly fixed / operated and each logical antenna port is connected to each physical antenna port 1: 1 and the signal is transmitted.

In the MIMO system, there may be differences in signal magnitude (intensity) between the respective radio paths (hereinafter referred to as Paths) in terms of the transmit / receive antenna ports due to the physical radio environment.

In the conventional MIMO system, since the outputs (signal transmission intensities) of the antenna ports Tx # 0, # 1, # 2 and # 3 are uniformly fixed / operated, There is a problem that the receiving apparatus (terminal) adversely affects the calculation of information such as highly reliable RSRP and SINR or adversely affects the consistency of the quality experienced by the receiving apparatus (terminal).

In addition, in the conventional MIMO system, there is a problem that network performance is deteriorated due to an imbalance in the signal size (intensity) between each path, which adversely affects the efficient operation of the total output (power intensity) determined in the transmitting apparatus.

In the conventional MIMO system, since each logical antenna port is mapped to each physical antenna port in a 1: 1 mapping and a signal is transmitted, even if a failure occurs in which a specific antenna port fails and signal transmission becomes impossible, The signal of a specific antenna port that fails is lost.

In a conventional MIMO system, when important information (e.g., CSR # 0) exists in a lost signal due to a failure of the specific antenna port, a serious problem situation (Out- of-Service.

Accordingly, the present invention proposes a method (dynamic multiplexing control method) capable of dynamically changing output (signal transmission intensity) and multiplexing scheme (1: N) for each antenna port from the viewpoint of optimizing network performance.

Hereinafter, a dynamic multiplexing apparatus for realizing a scheme proposed by the present invention will be described in detail with reference to FIG.

As shown in FIG. 2, the dynamic multiplexing apparatus 100 of the present invention is provided in a transmission apparatus, and is preferably provided between a logical antenna port and a physical antenna port.

A dynamic multiplexing apparatus (100) according to the present invention includes a collecting unit for collecting performance information related to a network performance, and a controller for changing signal transmission intensity based on the performance information for each of a plurality of antenna ports, A transmission strength optimizing unit 110 for optimizing the signal transmission intensity according to whether the contrast is improved or not; and a transmission intensity optimizing unit 110 for optimizing the signal strength of the antenna port, And a multiplexing unit 120 for determining a multiplexing scheme for transmitting signals through the plurality of antenna ports based on performance information.

The dynamic multiplexing apparatus 100 according to the present invention further includes a storage unit for storing a data set based on the collected performance information each time performance information is collected.

2, in the dynamic multiplexing apparatus 100 according to the present invention, the controller 130 performs the functions of the collecting unit and the storing unit.

In the case of FIG. 2, it is assumed that four physical antennas (ports) are provided on the transmitting apparatus side as an example. For convenience of explanation, four antenna ports Tx # 0 , # 1, # 2, # 3).

The control unit 130 collects performance information related to network performance.

In this case, the performance information refers to various information related to the network performance, for example, information such as a CQI (Channel Quality Indicator) reported from a receiving apparatus (terminal), and a BLER (Block Error Rate), a total throughput (T-put), a physical resource block (PRB) usage, and the like.

The controller 130 may collect performance information at every self-set collection period, or may collect performance information at every optimization period or at the occurrence of a specific event in which network performance changes rapidly, which will be described later.

While the optimizing operation is performed for each antenna port in the transmission strength optimizing unit 110, the controller 130 performs the optimizing operation for each antenna port and the multiplexing optimization operation in the multiplexing unit 120 It is desirable to newly collect the changed performance information every time the multiplexing scheme is changed.

Each time the performance information is collected, the controller 130 adds the quality of the generated performance information and the quality information generated based on this performance information to the signal strength of the antenna port at the collection time at which this performance information was collected, And a data set in which at least one of the multiplexing methods at the collection time at which the performance information is collected is mapped.

In this case, the control unit 130 stores a data set based on the collected performance information every time performance information is collected. In the case where there is a signal transmission intensity per antenna port and a multiplexing method is any (Data set) indicating the status of the network performance (performance information) and the score (quality value) converted into the numerical value of the network performance.

The transmission strength optimizing unit 110 changes the signal transmission intensity based on the performance information for each of the plurality of antenna ports Tx # 0, # 1, # 2, and # 3 and determines whether the network performance after the change is improved And performs an optimization operation of re-changing the signal transmission intensity depending on whether or not the signal transmission intensity is changed.

The transmission intensity optimizing unit 110 optimizes the signal transmission intensity for each of a plurality of antenna ports Tx # 0, # 1, # 2, and # 3 at predetermined optimization cycles or at the occurrence of a specific event in which the network performance changes rapidly It is desirable to perform an operation.

For example, the control unit 130 may request the transmission intensity optimizer 110 to perform an optimization operation when a predetermined optimization period is reached.

In addition, the control unit 130 may request the transmission intensity optimizer 110 to perform the optimization operation when a specific event in which the network performance is rapidly changed occurs.

In this case, the transmission strength optimizing unit 110 may perform a signal transmission intensity optimization operation for each of a plurality of antenna ports Tx # 0, # 1, # 2, and # 3 at the request of the controller 130 .

Here, the specific event in which the network performance changes rapidly is defined according to the setting method.

For example, it can be defined that when a T-put / PRB value of the performance information rapidly drops below a predetermined threshold value relative to the previous time, a specific event in which network performance changes rapidly occurs.

In this case, whenever the performance information is collected, the control unit 130 checks whether the T-put / PRB value drops sharply beyond a predetermined threshold value with respect to the previous time, and determines that a specific event has occurred , And may request the transmission intensity optimizer 110 to perform an optimization operation.

Meanwhile, in another example, the transmission strength optimizing unit 110 may be configured to optimize the number of antenna ports Tx # 0, # 1, # 2, # 3, 3) signal transmission intensity optimization operation can be performed.

Hereinafter, the process of optimizing the signal transmission intensity for each of the plurality of antenna ports Tx # 0, # 1, # 2, and # 3 in the transmission strength optimizer 110 will be described in detail.

First, a process of changing the signal transmission intensity during the signal transmission intensity optimization operation will be described.

The transmission strength optimizing unit 110 optimizes the current signal transmission intensity of the antenna port and the current performance information collected by the controller 130 (collecting unit) for each of the plurality of antenna ports Tx # 0, # 1, # 2, And the data set having the highest degree of similarity is retrieved from the pre-stored data set.

The transmission strength optimizing unit 110 calculates the current signal transmission intensity of the antenna port for each of the plurality of antenna ports Tx # 0, # 1, # 2 and # 3 based on the current performance information among the searched data sets To the signal transmission intensity of the corresponding antenna port in the data set having a quality value higher than the generated quality value.

For convenience of explanation, the antenna port Tx # 0 among the plurality of antenna ports Tx # 0, # 1, # 2, and # 3 will be described below as a representative.

The optimizer # 0, which is responsible for optimizing the signal transmission intensity for the antenna port Tx # 0 in the transmission strength optimizer 110, calculates the current signal transmission intensity of the antenna port Tx # 0 and the current signal transmission intensity of the antenna port Tx # And the data set having the highest degree of similarity is retrieved from the pre-stored data set, that is, the database-set data set.

The optimizer # 0 transmits the current signal transmission intensity of the antenna port Tx # 0 to the antenna port Tx # 0 in the data set having the quality value higher than the quality value generated based on the current performance information, Change to signal transmission strength.

There may be no data set having a higher quality value than the generated quality value based on the current performance information among the data sets retrieved earlier.

In this case, the optimizer # 0 reselects the current signal transmission intensity of the antenna port Tx # 0 and the current signal transmission intensity of the antenna port Tx # 0, It is preferable to change the signal transmission intensity of the antenna port Tx # 0 in the data set having a quality value higher than the quality value generated based on the current performance information among the re-searched data sets.

The other optimizers # 1, # 2 and # 3 in the transmission strength optimizing unit 110 also calculate the signal transmission strength for each of the antenna ports Tx # 1, # 2 and # 3 in the same manner as the optimizer # Can be changed.

Next, a process of determining whether or not the network performance is improved after changing the signal transmission intensity during the signal transmission intensity optimization operation will be described.

The transmission strength optimizing unit 110 may change the signal transmission intensity of the antenna port for each of the plurality of antenna ports Tx # 0, # 1, # 2, and # 3, Information on the basis of the quality value in the data set immediately before the change.

If the quality value after change is higher than the quality value just before the change for each of the plurality of antenna ports (Tx # 0, # 1, # 2, # 3) And determines the signal transmission intensity according to the optimization operation of the antenna port as the changed signal transmission intensity.

For convenience of explanation, the antenna port Tx # 0 among the plurality of antenna ports Tx # 0, # 1, # 2, and # 3 will be referred to as a representative.

As described above, the optimizer # 0 transmits the current signal transmission intensity of the antenna port Tx # 0 to the signal transmission intensity of the antenna port Tx # 0 in the data set having a quality value higher than the quality value generated based on the current performance information After the change, the control unit 130 confirms the generated quality value based on the newly collected performance information.

Then, the optimizer # 0 checks whether the quality value confirmed after changing the signal transmission intensity of the antenna port Tx # 0 is higher than the quality value in the data set just before the change.

That is, the score (quality value) obtained by converting the network performance after changing the signal transmission intensity of the antenna port Tx # 0 to a numerical value is compared with a score (quality value) obtained by converting the network performance before the change To confirm.

Optimizer # 0 determines that the network performance has not improved compared with the value before the change if the quality value after changing the signal transmission intensity of antenna port Tx # 0 is not higher than the quality value just before the change, The above-described change process of changing (re-changing) the network performance is repeatedly performed until the network performance is improved before the change.

Optimizer # 0 determines that the network performance is improved from before the change if the quality value after changing the signal transmission strength of the antenna port Tx # 0 is higher than the quality value just before the change, The transmission intensity can be determined as the signal transmission intensity after the current change, and the current signal transmission intensity optimization operation for the antenna port Tx # 0 can be completed.

The other optimizers # 1, # 2 and # 3 in the transmission strength optimizing unit 110 also calculate the signal transmission strength for each of the antenna ports Tx # 1, # 2 and # 3 in the same manner as the optimizer # After the change, it is determined whether or not the network performance is improved before the change, and the above-described change process of changing (re-changing) the signal transmission intensity according to the change is repeated until the network performance is improved before the change. .

As described above, the dynamic multiplexing apparatus 100 according to the present invention is configured such that the output (signal transmission intensity) of each of the antenna ports Tx # 0, # 1, # 2, and # 3 is uniformly fixed / Unlike the existing MIMO system, it uses the history (data set) of its own database and builds up the signal transmission intensity per antenna port (Tx # 0, # 1, # 2, # 3) / Can be determined optimally.

The multiplexing unit 120 determines the signal transmission strength for each antenna port by the optimization operation performed for each of the plurality of antenna ports Tx # 0, # 1, # 2, and # 3, And determines a multiplexing scheme for transmitting a signal through a plurality of antenna ports Tx # 0, # 1, # 2, and # 3 based on the collected current performance information.

Specifically, when the intensity of signal transmission per antenna port is determined by the optimization operation performed for each of the plurality of antenna ports Tx # 0, # 1, # 2, and # 3, the multiplexing unit 120 determines The multiplexing optimization operation is performed on the plurality of antenna ports Tx # 0, # 1, # 2, and # 3 based on the signal transmission strength and the current performance information collected by the control unit 130.

More specifically, the multiplexing unit 120 multiplexes a plurality of antenna ports Tx # 0, # 1, and # 2 based on the previously determined optimal signal strengths per antenna port and the current performance information collected by the controller 130 , # 3), and performs a multiplexing optimization operation for re-modifying the multiplexing scheme according to whether the network performance after the change is improved before the change.

At this time, it is preferable that the multiplexing unit 120 maintains the multiplexing scheme determined by the previously performed multiplexing optimization operation while the transmission intensity optimizer 110 performs the optimization operation for each antenna port.

Hereinafter, a process of performing a multiplexing optimization operation on a plurality of antenna ports Tx # 0, # 1, # 2, and # 3 in the multiplexing unit 120 will be described in detail.

First, a process of changing the multiplexing scheme during the multiplexing optimization operation will be described.

The multiplexing unit 120 searches a data set having the highest degree of similarity with the best-determined signal intensity for each antenna port and the current performance information collected from the control unit (collecting unit) 130 in a pre-stored or database- do.

The multiplexing unit 120 multiplexes the multiplexing scheme for the plurality of antenna ports Tx # 0, # 1, # 2, and # 3 with a quality value generated based on the current performance information among the searched data sets And changes to a multiplexing method in a data set having a high quality value.

In this case, the data set having the highest degree of similarity is assumed to have a degree of similarity of more than a certain level (for example, 80% or more), and the pre-stored data set, that is, the data having the highest degree of similarity There may not be a data set more than the assumed similarity level (for example, 80%) when searching the set.

For example, at the initial operation of the dynamic multiplexing apparatus 100 or immediately after the initial operation, the databaseized data set (history) may not be sufficient.

In this case, the multiplexing unit 120 sequentially and arbitrarily changes a changeable multiplexing scheme (e.g., 1: 1, 1: 2, 1: 3, 1: 4) It is possible to store and construct a sufficient data set (history) according to the newly collected performance information, and the multiplexing method when the quality value is the highest based on the data set stored while performing the process for a predetermined time is the optimum multiplexing method You can decide.

On the other hand, there may be no data set having a higher quality value than the quality value generated based on the current performance information among the previously retrieved data sets.

In this case, the multiplexing unit 120 re-searches the data set having the next highest degree of similarity to the signal strength of each antenna port and the current performance information, and then searches the plurality of antenna ports Tx # 0, # 1, # 2, 3) to a multiplexing scheme in the data set having a quality value higher than the quality value generated based on the current performance information among the data sets that have been re-searched previously.

At this time, the multiplexing scheme is based on the multiplexing matrix selected by the multiplexing unit 120.

Here, the multiplexing matrix may be configured to transmit (transmit) signals through mutually orthogonal antenna ports according to a mapping scheme (1: N) for how many of the plurality of antenna ports transmit the signal of one logical antenna port Defined matrix element layout and the predefined transmit power of the signals transmitted through the multiple antenna ports to be maximally accommodated within the limited total power strength depending on the signal transmit power per antenna port And has a weight for each matrix element.

For example, assuming that four antenna ports are provided on the transmission apparatus side equipped with the dynamic multiplexing apparatus 100 of the present invention and four antenna ports are provided on the reception apparatus side, the multiplexing matrix is 4 * 4 matrix.

At this time, the multiplexing matrix is a mapping method (1: N) for how many of the antenna ports of the four logical antenna ports (Tx # 0, # 1, # 2, # 3) Has a predefined matrix element arrangement such that the signals of one logical antenna port can be transmitted through mutually orthogonal antenna ports.

That is, the multiplexing matrix includes a matrix element arrangement type when the mapping method is 1: 2, a matrix element arrangement type when the mapping method is 1: 3, and a matrix element arrangement type when the mapping method is 1: It is defined.

In the multiplexing matrix, the total transmission intensity of signals transmitted through the four antenna ports Tx # 0, # 1, # 2, and # 3 is determined (limited) Has a weight for each matrix element predefined to be maximally accommodated within the total output (power intensity).

That is, in the multiplexing matrix, when the signal transmission intensity determined optimally for each of the antenna ports Tx # 0, # 1, # 2 and # 3 is 1: 1: 1: 1, , 1: 1: 2: 2, and 1: 3: 1: 2, the weight of each matrix element is predefined.

Accordingly, changing the multiplexing scheme may be performed by changing the multiplexing scheme so that the multiplexing unit 120 multiplexes the multiplexing scheme in the data set (specifically, the mapping scheme) having a higher quality value than the quality value generated based on the current performance information, Can be realized by selecting a multiplexing matrix based on the transmission strength.

Therefore, the multiplexing scheme in the data set having the quality value higher than the quality value generated based on the current performance information is 1: 2 in the mapping scheme, and when the best determined signal transmission intensity per antenna port is 1: 1: 1: 1 Assuming, the multiplexing unit 120 may be changed by selection of the multiplexing matrix (M _SPM), such as the following, multiplexing the multiplexing scheme to conform to the matrix (M _SPM).

As described above, the multiplexing matrix (M _SPM ) has a matrix element arrangement in which a signal of one logical antenna port is transmitted through two physical antenna ports, and a non-zero matrix element has a signal transmission intensity per antenna port (1: 1: 1: 1) have different weights for each matrix element.

The multiplexing unit 120, the above multiplexing matrix (M _SPM) for selection by multiplexing the multiplexing scheme matrix (M _SPM) when changing to conform to the, by the dynamic multiplexing apparatus 100 of the present invention, shown in Figure 3 A mapping relation between the logical antenna port and the physical antenna port is performed.

3, the transmitter-side signal processing unit 10 generates a plurality of data layers, performs a signal processing process such as mapping and precoding of each data layer, # 0, # 1, # 2, # 3). This is the same as the existing MIMO system.

At this time, by the dynamic multiplexing apparatus 100 of the present invention, the signal of the logical antenna port Ant # 0 is transmitted to the radio environment through the two antenna ports Tx # 0 and # 2 mapped to 1: 2 , The signal of the logical antenna port Ant # 1 is transmitted to the radio environment through the two antenna ports Tx # 1 and # 3 mapped to 1: 2, and the signal of the logical antenna port Ant # The signal of the logical antenna port Ant # 3 is transmitted through the two antenna ports Tx # 2 and # 0 mapped with 1: , # 1) to the wireless environment.

As described above, in the embodiment shown in FIG. 3, in the transmitting apparatus, signals are transmitted through the two physical antenna ports of each logical antenna port. That is, the receiving apparatus can receive signals corresponding to the two logical antenna ports through the respective antenna ports Rx # 0, # 1, # 2, and # 3.

Therefore, in the MIMO system in which the dynamic multiplexing apparatus 100 of the present invention is applied, each logical antenna port signal of the transmitting apparatus is transmitted to the receiving apparatus through multiple paths rather than a single path.

Next, a process of determining whether the network performance is improved after the multiplexing scheme change during the multiplexing optimization operation will be described.

The multiplexing unit 120 checks the generated quality value based on the performance information newly collected by the control unit 130 after changing the multiplexing scheme.

Then, the multiplexing unit 120 checks whether or not the quality value confirmed after changing the multiplexing scheme is higher than the quality value in the immediately preceding data set.

That is, the score (quality value) obtained by converting the network performance after the change of the multiplexing scheme into numerical values is checked whether or not the network performance before the change is higher than the score (quality value) converted into numerical values.

If the quality value after the multiplexing scheme change is not higher than the quality value just before the change, the multiplexing unit 120 determines that the network performance is not improved from before the change, and changes the multiplexing scheme Repeat until performance is improved before change.

If the quality value after the multiplexing scheme change is higher than the quality value just before the change, the multiplexing unit 120 determines that the network performance is improved from before the change, determines the multiplexing scheme according to the optimization operation as the post-change multiplexing scheme, The optimization operation can be completed.

As described above, the dynamic multiplexing apparatus 100 according to the present invention includes the logical antenna ports Ant # 0, # 1, # 2 and # 3 and the physical antenna ports Tx # 0, # 1, # 2, (1: N) in the direction of improving the network performance by utilizing the history (data set) which is built in and built in itself, unlike the existing MIMO system which maps 1: So that it can be determined optimally.

Particularly, in the present invention, by changing the multiplexing scheme between the logical antenna port and the physical antenna port by selecting a unitary multiplexing matrix, the mapping relationship between the logical antenna port and the physical antenna port is dynamically changed to 1: N It is possible to prevent the adverse influence on the orthogonality between the signals and to efficiently operate the receiving apparatus by maximally utilizing the (limited) total output (total power intensity) set in the transmitting apparatus.

In addition, in the present invention, a multiplexing optimization process for optimally determining a multiplexing scheme by dynamically changing a multiplexing scheme by performing multiplexing optimization secondarily by first performing signal transmission intensity optimization for each antenna port, The complexity of selecting the multiplexing matrix of the present invention can be remarkably reduced.

As described above, according to the dynamic multiplexing apparatus 100 of the present invention, the output (signal transmission intensity) of each of the antenna ports Tx # 0, # 1, # 2 and # 3 is uniformly fixed / Unlike the conventional MIMO system in which the ports Ant # 0, # 1, # 2 and # 3 and the physical antenna ports Tx # 0, # 1, # 2 and # 3 are mapped to 1: 1, (1: N) for each antenna port (Tx # 0, # 1, # 2, # 3) in the direction of improving the network performance by utilizing the built / It can be determined optimally.

Therefore, according to the present invention, the imbalance in the signal strength (strength) between each path in the MIMO system from the point of view of the transmitting / receiving antenna port is solved, so that the receiving apparatus (terminal) has a bad influence on the calculation of information such as RSRP and SINR, (Power intensity) set in the transmitting apparatus can be efficiently operated, and it is possible to efficiently operate the transmitting apparatus in a specific antenna port Even if a failure occurs, the logical antenna port signal is transmitted through multiple paths instead of a single path, so that it is possible to provide a normal service without an out-of-service condition.

As described above, in the present invention, the MIMO system dynamically changes the signal transmission intensity and the multiplexing scheme (1: N) for each antenna port in the direction of optimizing the network performance, thereby optimizing the network performance, It is possible to obtain an effect that can be guaranteed.

Hereinafter, a dynamic multiplexing control method according to a preferred embodiment of the present invention will be described in detail with reference to FIG. Hereinafter, for convenience of description, description will be made with reference to FIG. 2 and FIG. 3 described above.

According to the dynamic multiplexing control method of the present invention, the dynamic multiplexing apparatus 100 collects performance information related to network performance (SlOO).

The dynamic multiplexing apparatus 100 may collect performance information at each self-set collection period, or may collect performance information at each optimization period, which will be described later, or at the occurrence of a specific event in which network performance changes rapidly.

However, the dynamic multiplexing apparatus 100 may be configured to change the signal transmission intensity every time the signal transmission intensity is changed for each antenna port while performing the optimization operation for each antenna port as described later, and during the multiplexing optimization operation, It is desirable to newly collect the performance information after that.

According to the dynamic multiplexing control method of the present invention, the dynamic multiplexing apparatus 100 stores a data set based on the collected performance information each time performance information is collected, A history (data set) indicating how the network performance (performance information) is and the score (quality value) converted into numerical value is in a database can be constructed in the database (S100).

According to the dynamic multiplexing control method of the present invention, the dynamic multiplexing apparatus 100 determines whether a predetermined optimization cycle is reached or a specific event in which network performance changes rapidly (S110), and when the optimization cycle is reached When a specific event occurs (S110 Yes), the signal transmission intensity optimization operation can be performed for each of the plurality of antenna ports Tx # 0, # 1, # 2, and # 3 (S120, S130).

More specifically, in the dynamic multiplexing apparatus 100, for each of the plurality of antenna ports Tx # 0, # 1, # 2, and # 3, the current signal transmission intensity of the antenna port and the highest The data set is searched in the pre-stored data set (S120).

The dynamic multiplexing apparatus 100 generates the current signal transmission intensity of the antenna port for each of the plurality of antenna ports Tx # 0, # 1, # 2, and # 3 on the basis of the current performance information among the searched data sets To a signal transmission intensity of the corresponding antenna port in the data set having a quality value higher than the quality value of the antenna port (S120).

For convenience of explanation, the antenna port Tx # 0 among the plurality of antenna ports Tx # 0, # 1, # 2, and # 3 will be referred to as a representative.

Optimizer # 0, which is responsible for optimizing the signal transmission intensity for antenna port Tx # 0 in dynamic multiplexing device 100, calculates the current signal transmission intensity of antenna port Tx # 0 and the data with highest similarity to the collected current performance information The set is retrieved from the pre-stored data set, that is, the database-set data set.

The optimizer # 0 transmits the current signal transmission intensity of the antenna port Tx # 0 to the antenna port Tx # 0 in the data set having the quality value higher than the quality value generated based on the current performance information, Change to signal transmission strength.

There may be no data set having a higher quality value than the generated quality value based on the current performance information among the data sets retrieved earlier.

In this case, the optimizer # 0 reselects the current signal transmission intensity of the antenna port Tx # 0 and the current signal transmission intensity of the antenna port Tx # 0, It is preferable to change the signal transmission intensity of the antenna port Tx # 0 in the data set having a quality value higher than the quality value generated based on the current performance information among the re-searched data sets.

The other optimizers # 1, # 2 and # 3 in the dynamic multiplexing apparatus 100 also change the signal transmission intensity for each of the antenna ports Tx # 1, # 2 and # 3 in the same manner as the optimizer # .

Then, the dynamic multiplexing apparatus 100 determines a quality value based on the collected performance information after changing the signal transmission intensity of the antenna port for each of the plurality of antenna ports Tx # 0, # 1, # 2, Is higher than the quality value in the immediately preceding data set (S130).

The dynamic multiplexing apparatus 100 is configured such that if the quality value after change is higher than the quality value just before the change for each of the plurality of antenna ports Tx # 0, # 1, # 2, and # 3, (S130 Yes), and determines the signal transmission intensity according to the optimization operation of the antenna port as the changed signal transmission intensity (S140).

For convenience of explanation, the antenna port Tx # 0 among the plurality of antenna ports Tx # 0, # 1, # 2, and # 3 will be referred to as a representative.

Optimizer # 0, which is responsible for optimizing the signal transmission strength for antenna port Tx # 0 in dynamic multiplexing device 100, generates the current signal transmission strength of antenna port Tx # 0 based on the current performance information To the signal transmission intensity of the antenna port Tx # 0 in the data set having a quality value higher than the quality value of the data set, and then confirms the generated quality value based on the newly collected performance information.

Then, the optimizer # 0 determines whether the quality value confirmed after changing the signal transmission intensity of the antenna port Tx # 0 is higher than the quality value in the data set immediately before the change (S130).

That is, the score (quality value) obtained by converting the network performance after changing the signal transmission intensity of the antenna port Tx # 0 to a numerical value is compared with a score (quality value) obtained by converting the network performance before the change To confirm.

Optimizer # 0 determines that the network performance has not improved compared to the value before the change (No in S130) if the quality value after changing the signal transmission strength of the antenna port Tx # 0 is not higher than the quality value just before the change, (Re-changing) the signal transmission strength of the network performance is repeatedly performed until the network performance is improved before the change (S120, S130).

Optimizer # 0 determines that the network performance is improved compared to the value before the change if the quality value after the change of the signal transmission strength of the antenna port Tx # 0 is higher than the quality value just before the change (Yes in S130) The signal transmission intensity according to the optimization operation is determined as the signal transmission intensity after the current change, and the current signal transmission intensity optimization operation for the antenna port Tx # 0 can be completed (S140).

The other optimizers # 1, # 2 and # 3 in the dynamic multiplexing apparatus 100 also change the signal transmission intensity for each of the antenna ports Tx # 1, # 2 and # 3 in the same manner as the optimizer # After the network performance is improved, the signal transmission intensity is changed (re-changed) according to the change. The above-described modification process is repeated until the network performance is improved before the change, I will finish.

According to the dynamic multiplexing control method of the present invention, the dynamic multiplexing apparatus 100 primarily performs signal transmission intensity optimization for each antenna port, and then performs a multiplexing optimization operation (S150, S160).

More specifically, the dynamic multiplexing apparatus 100 searches for a data set having the highest degree of similarity with the previously determined signal transmission intensity per antenna port and the collected current performance information in a pre-stored or database-based data set do.

The dynamic multiplexing apparatus 100 multiplexes the multiplexing scheme for a plurality of antenna ports Tx # 0, # 1, # 2, and # 3 with a quality value generated based on the current performance information among the searched data sets To a multiplexing scheme in a data set having a higher quality value.

In this case, the data set having the highest degree of similarity is assumed to have a degree of similarity of more than a certain level (for example, 80% or more), and the pre-stored data set, that is, the data having the highest degree of similarity There may not be a data set more than the assumed similarity level (for example, 80%) when searching the set.

For example, at the initial operation of the dynamic multiplexing apparatus 100 or immediately after the initial operation, the databaseized data set (history) may not be sufficient.

In this case, the dynamic multiplexing apparatus 100 is capable of sequentially or arbitrarily changing a changeable multiplexing scheme (e.g., 1: 1, 1: 2, 1: 3, 1: 4) It is possible to store and construct a sufficient data set (history) according to the information, and it is possible to determine the multiplexing method when the quality value is the highest based on the data set stored while performing the process for a predetermined time, as an optimal multiplexing method.

On the other hand, there may be no data set having a higher quality value than the quality value generated based on the current performance information among the previously retrieved data sets.

In this case, the dynamic multiplexing apparatus 100 re-searches the data set having the next highest degree of similarity to the signal strength of each antenna port and the current performance information, and then searches the plurality of antenna ports Tx # 0, # 1, # 2, # 3) is changed to a multiplexing scheme in a data set having a quality value higher than the quality value generated based on the current performance information among the data sets re-searched earlier.

At this time, the multiplexing scheme follows the multiplexing matrix selected by the dynamic multiplexing apparatus 100. [

For example, assuming that four antenna ports are provided on the transmission apparatus side equipped with the dynamic multiplexing apparatus 100 of the present invention and four antenna ports are provided on the reception apparatus side, the multiplexing matrix is 4 * 4 matrix.

At this time, the multiplexing matrix is a mapping method (1: N) for how many of the antenna ports of the four logical antenna ports (Tx # 0, # 1, # 2, # 3) Has a predefined matrix element arrangement such that the signals of one logical antenna port can be transmitted through mutually orthogonal antenna ports.

In the multiplexing matrix, the total transmission intensity of signals transmitted through the four antenna ports Tx # 0, # 1, # 2, and # 3 is determined (limited) Has a weight for each matrix element predefined to be maximally accommodated within the total output (power intensity).

Accordingly, changing the multiplexing scheme in step S150 may be performed by a multiplexing scheme (in particular, a mapping scheme) in the data set having a quality value higher than the quality value generated based on the dynamic current performance information, And selecting the multiplexing matrix based on the multiplexing matrix.

Therefore, the multiplexing scheme in the data set having the quality value higher than the quality value generated based on the current performance information is 1: 2 in the mapping scheme, and when the best determined signal transmission intensity per antenna port is 1: 1: 1: 1 Assuming a dynamic multiplexing device 100, by selecting the next multiplexing matrix (M _SPM), such as can be changed to conform to the multiplexing scheme for multiplexing matrix (M _SPM).

When the dynamic multiplexing apparatus 100 changes the multiplexing scheme according to the multiplexing matrix M _SPM by selecting the upper multiplexing matrix M _SPM , the mapping of the logical antenna port and the physical antenna port as shown in FIG. 3 A relationship is established.

3, the transmitter-side signal processing unit 10 generates a plurality of data layers, performs a signal processing process such as mapping and precoding of each data layer, # 0, # 1, # 2, # 3). This is the same as the existing MIMO system.

At this time, by the dynamic multiplexing apparatus 100 of the present invention, the signal of the logical antenna port Ant # 0 is transmitted to the radio environment through the two antenna ports Tx # 0 and # 2 mapped to 1: 2 , The signal of the logical antenna port Ant # 1 is transmitted to the radio environment through the two antenna ports Tx # 1 and # 3 mapped to 1: 2, and the signal of the logical antenna port Ant # The signal of the logical antenna port Ant # 3 is transmitted through the two antenna ports Tx # 2 and # 0 mapped with 1: , # 1) to the wireless environment.

As described above, in the embodiment shown in FIG. 3, in the transmitting apparatus, signals are transmitted through the two physical antenna ports of each logical antenna port. That is, the receiving apparatus can receive signals corresponding to the two logical antenna ports through the respective antenna ports Rx # 0, # 1, # 2, and # 3.

Therefore, in the MIMO system in which the dynamic multiplexing apparatus 100 of the present invention is applied, each logical antenna port signal of the transmitting apparatus is transmitted to the receiving apparatus through multiple paths rather than a single path.

The dynamic multiplexing apparatus 100 confirms the generated quality value based on the newly collected performance information after changing the multiplexing scheme.

Then, the dynamic multiplexing apparatus 100 checks whether the quality value confirmed after changing the multiplexing scheme is higher than the quality value in the data set immediately before the change (S160).

That is, the score (quality value) obtained by converting the network performance after the change of the multiplexing scheme into numerical values is checked whether or not the network performance before the change is higher than the score (quality value) converted into numerical values.

The dynamic multiplexing apparatus 100 determines that the network performance is not improved as compared with the change before the quality value after the multiplexing scheme change is not higher than the quality value just before the change (S160 No), and tries to change (re-change) the multiplexing scheme A change process is repeatedly performed until the network performance is improved before the change (S150, S160).

If the quality value after the multiplexing scheme change is higher than the quality value just before the change, the dynamic multiplexing apparatus 100 determines that the network performance is improved from before the change (Yes in S160), and the multiplexing scheme according to the optimization operation is changed to the multiplexing scheme after the change , And the multiplexing optimization operation can be completed (S170).

Therefore, the transmitting apparatus to which the dynamic multiplexing apparatus 100 according to the present invention is applied is provided with an optimum antenna port signal transmission intensity and a multiplexing scheme (1: N) determined by dynamic / alteration in the direction of optimizing network performance, (S180).

As described above, according to the dynamic multiplexing control method of the present invention, the MIMO system can dynamically change the signal transmission intensity and the multiplexing scheme (1: N) for each antenna port in the direction of optimizing the network performance, But also the stability and the service quality can be ensured optimally and consistently.

The dynamic multiplexing control method according to an exemplary embodiment of the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

According to the operation method of the terminal device and the terminal device according to the present invention, since the output (signal transmission intensity) and the multiplexing method (1: N) for each antenna port are dynamically changed in the direction of optimizing the network performance in the MIMO system, It is an invention that is industrially applicable because it is beyond the limit of the existing technology, and it is not only the use of the related technology, but also the possibility of commercialization or operation of the applied device is sufficient and practically possible.

100: Dynamic multiplexing device
110: Transmission strength optimizing unit 120: Multiplexing unit
130:

Claims (11)

A collection unit for collecting performance information related to network performance;
A transmission strength optimizer for performing an optimization operation for changing a signal transmission intensity based on the performance information for each of a plurality of antenna ports and re-changing a signal transmission strength according to whether the network performance is improved before the change; And
And a multiplexing unit for determining a multiplexing scheme for transmitting a signal through the plurality of antenna ports based on the performance information after the signal transmission strength for each antenna port is determined by the optimization operation performed for each of the plurality of antenna ports And a multiplexer for multiplexing the multiplexed data. The method according to claim 1,
Wherein each time the performance information is collected, the quality value generated based on the collected performance information and the performance information includes at least one of a signal transmission intensity for each antenna port at the collection time at which the performance information is collected and a multiplexing method at the collection time Further comprising: a storage unit for storing a data set in which the mapped data is mapped. 3. The method of claim 2,
Wherein the transmission strength optimizing unit comprises:
Searching for a data set having the highest similarity to the current signal transmission intensity of the antenna port and the current performance information collected by the collecting unit in the pre-stored data set for each of the plurality of antenna ports,
For each of the plurality of antenna ports, a current signal transmission intensity of the antenna port to a signal transmission intensity of the antenna port in a data set having a quality value higher than a quality value generated based on the current performance information among the searched data sets And wherein the multiplexing unit multiplexes the multiplexed data. 3. The method of claim 2,
Wherein the transmission strength optimizing unit comprises:
After the signal transmission intensity of the antenna port is changed for each of the plurality of antenna ports, whether the quality value generated based on the performance information collected by the collection unit is higher than the quality value in the data set immediately before the change,
When the quality value after the change is higher than the quality value just before the change, it is determined that the network performance is improved from before the change, and the signal transmission intensity according to the optimization operation of the antenna port is compared with the changed signal transmission intensity And the dynamic multiplexing device determines the dynamic multiplexing. 3. The method of claim 2,
The multiplexing unit,
The multiplexing method for the plurality of antenna ports is changed based on the signal transmission intensity for each antenna port determined by the optimization operation performed for each of the plurality of antenna ports and the performance information and whether the network performance after the change is improved And performs a multiplexing optimization operation for re-modifying the multiplexing scheme according to the multiplexing scheme. 6. The method of claim 5,
The multiplexing unit,
Searching the pre-stored data set for a data set having the highest degree of similarity to the current transmit power of the antenna port and the current performance information collected by the collecting unit,
Wherein the multiplexing scheme for the plurality of antenna ports is changed to a multiplexing scheme in a data set having a quality value higher than a quality value generated based on the current performance information among the searched data sets. The method according to claim 6,
The multiplexing unit,
After the multiplexing scheme is changed, it is checked whether the quality value generated based on the performance information collected by the collection unit is higher than the quality value in the data set immediately before the change,
And determines that the network performance is improved before the change if the quality value after change is higher than the quality value just before the change, and determines the multiplexing method according to the optimization operation as the post-change multiplexing method. 6. The method of claim 5,
Wherein the multiplexing scheme is based on a multiplexing matrix selected by the multiplexing unit,
Wherein the multiplexing matrix comprises:
A matrix element arrangement type defined to enable the signals to be transmitted through mutually orthogonal antenna ports, according to a mapping scheme of how one of the plurality of antenna ports transmits a signal of one logical antenna port Wow,
Characterized in that the total transmission strength of signals transmitted through the plurality of antenna ports is weighted for each matrix element so as to be maximally accommodated within the limited total power intensity according to the signal transmission intensity for each antenna port A dynamic multiplexing device. The method according to claim 1,
The signal transmission intensity optimization operation for each of the plurality of antenna ports may include:
At predetermined preset optimization cycles or at the occurrence of a specific event in which network performance changes rapidly. A collection step of collecting performance information related to network performance;
A transmission intensity optimizing step of performing an optimizing operation for changing a signal transmission intensity based on the performance information for each of a plurality of antenna ports and re-changing a signal transmission strength depending on whether the network performance is improved before changing after the change; And
And a multiplexing step of determining a multiplexing scheme for transmitting a signal through the plurality of antenna ports based on the performance information after the strength of signal transmission for each antenna port is determined according to optimization performed for each of the plurality of antenna ports Wherein the dynamic multiplexing control method comprises: 11. The method of claim 10,
Wherein the multiplexing comprises:
The multiplexing method for the plurality of antenna ports is changed based on the signal transmission intensity for each antenna port determined by the optimization operation performed for each of the plurality of antenna ports and the performance information and whether the network performance after the change is improved And performing a multiplexing optimization operation for re-modifying the multiplexing scheme according to the multiplexing scheme.

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