KR20160025907A - Apparatus and method for determining parameters in wireless communication environments - Google Patents

Apparatus and method for determining parameters in wireless communication environments Download PDF

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Publication number
KR20160025907A
KR20160025907A KR1020140113378A KR20140113378A KR20160025907A KR 20160025907 A KR20160025907 A KR 20160025907A KR 1020140113378 A KR1020140113378 A KR 1020140113378A KR 20140113378 A KR20140113378 A KR 20140113378A KR 20160025907 A KR20160025907 A KR 20160025907A
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South Korea
Prior art keywords
base station
cqi
preliminary
delta
channel quality
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KR1020140113378A
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Korean (ko)
Inventor
이범렬
장재선
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주식회사 케이티
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Priority to KR1020140113378A priority Critical patent/KR20160025907A/en
Publication of KR20160025907A publication Critical patent/KR20160025907A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/06—Testing, supervising or monitoring using simulated traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication

Abstract

The present invention relates to a method and device for determining a parameter in a wireless communications environment. In particular, the method for determining a parameter in a wireless communications environment according to an embodiment of the present invention comprises: a storing step of collecting and storing wireless environment information of a cell and a channel quality indicator (CQI) of a terminal device through a base station; calculating a preliminary base station CQI by applying a predetermined preliminary delta CQI to the stored channel quality information, re-determining a modulation and coding scheme (MCS) schedule of the base station according to the stored wireless environment information and the calculated preliminary base station CQI, and calculating a throughput of the base station according to the re-determined MCS schedule; and a parameter determining step of extracting a preliminary delta CQI for providing a maximum treatment speed from the calculated treatment speed, and changing the extracted preliminary delta CQI into a delta CQI of the base station.

Description

[0001] The present invention relates to a parameter setting method and a parameter setting apparatus in a wireless communication environment,

The present invention relates to a parameter setting method and a parameter setting apparatus in a wireless communication environment, and more particularly, to a parameter setting method and a parameter setting apparatus in a wireless communication environment capable of extracting parameters using statistics on wireless communication environment information will be.

Generally, a terminal device accesses a 3G communication network or an LTE (Long Term Evolution) communication network through a base station and receives a mobile communication service. Here, since the terminal apparatus and the base station are connected by wireless communication, the communication quality provided by the terminal apparatus varies depending on the wireless communication environment between the terminal apparatus and the base station. Therefore, in order to provide an optimum call quality or a communication speed, the base station can adjust a modulation and coding scheme (MCS) schedule for the terminal according to the characteristics of each cell.

Conventionally, parameters for MCS schedules and the like have been set by directly performing performance tests and parameter changes in an experimental environment (Test Bed) or an actual cell having the same radio environment condition as that of each cell. However, it is difficult to keep the control variables of the signal-to-interference plus noise ratio (SINR) and the base station signal power (RSRP) constant in the experimental environment or the actual cell, And it is difficult to carry out the experiment of FIG. Further, after each parameter is changed, a performance test or the like must be performed again to confirm the result, so that it takes a lot of time and effort to set the parameter.

The present application is intended to provide a parameter setting method and a parameter setting apparatus in a wireless communication environment capable of extracting parameters using statistics on wireless communication environment information.

A parameter setting method in a wireless communication environment according to an embodiment of the present invention includes: a storing step of collecting and storing radio environment information of a cell and channel quality indicator (CQI) of a terminal device; Calculating a preliminary base station CQI by applying a preset preliminary delta CQI to the stored channel quality information, resetting a Modulation and Coding Scheme (MCS) schedule of the base station according to the stored radio environment information and the calculated preliminary base station CQI, A simulation step of calculating a throughput of the base station according to the reset MCS schedule; And a parameter setting step of extracting a preliminary delta CQI that provides a maximum processing speed among the calculated processing rates, and changing the extracted preliminary delta CQI to a delta CQI of the base station.

The storing step may store at least one of a signal to interference plus noise ratio (SINR), a reference signal received power (RSRP), and an interference to the wireless environment information .

Here, the storing step may collect the radio environment information and the channel quality information for a predetermined reference period, and may store and store statistics for each day of the week or for each time period.

Here, the simulation step may calculate each of the preliminary base station CQIs using a plurality of preliminary delta CQIs, individually reset the MCS schedule for the preliminary base station CQI, and calculate a processing rate corresponding to the preliminary delta CQI have.

Here, the simulation step may calculate the spare base station CQI by adding the preliminary delta CQI to the channel quality information.

Here, the simulation step may derive the preliminary delta CQI using a predetermined random function.

Wherein the parameter setting step compares the maximum processing speed based on the extracted preliminary delta CQI with the current processing speed of the base station and if the maximum processing speed based on the preliminary delta CQI is larger than the current processing speed of the base station, The delta CQI can be changed to the delta CQI of the base station.

A method of setting a parameter in a wireless communication environment according to another embodiment of the present invention is a method of setting a parameter in a wireless communication environment in which a base station transmits a channel quality indicator (CQI) and a block error rate (BLER) A storage step of collecting and storing; Calculating a preliminary base station CQI by applying a predetermined preliminary delta CQI to the stored channel quality information, resetting a modulation and coding scheme (MCS) schedule of the base station according to the preliminary base station CQI and the block error rate, A simulation step of calculating a throughput of the base station according to a schedule; And a parameter setting step of extracting a preliminary delta CQI that provides a maximum processing speed among the calculated processing rates and setting the extracted delta CQI as a delta CQI in the base station.

A parameter setting apparatus in a wireless communication environment according to an embodiment of the present invention includes a database unit including radio environment information of a cell and channel quality indicator (CQI) of the terminal apparatus; And a preliminary delta CQI preset to the stored channel quality information to calculate a reserve base station CQI and reset a modulation and coding scheme (MCS) schedule of the base station according to the stored radio environment information and the calculated reserved base station CQI And a simulation unit for calculating a throughput of the base station according to the reset MCS schedule to extract a preliminary delta CQI that provides a maximum processing speed.

In addition, the means for solving the above-mentioned problems are not all enumerating the features of the present invention. The various features of the present invention and the advantages and effects thereof will be more fully understood by reference to the following specific embodiments.

According to the parameter setting method and the parameter setting apparatus in the wireless communication environment according to the embodiment of the present invention, the parameters can be extracted using the statistics on the wireless communication environment information.

According to the parameter setting method and parameter setting apparatus in the wireless communication environment according to the embodiment of the present invention, the parameter that can obtain the optimum effect can be efficiently extracted as compared with the method utilizing the conventional test bed .

According to the parameter setting method and the parameter setting apparatus in a wireless communication environment according to an embodiment of the present invention, parameter setting according to cell characteristics such as a downtown area and an outline area can be easily performed.

According to the parameter setting method and parameter setting apparatus in a wireless communication environment according to an embodiment of the present invention, parameters for each cell can be efficiently set by using a statistical transition.

1 is a schematic diagram illustrating an embodiment of a wireless communication system.
2 is a block diagram showing a parameter setting apparatus according to an embodiment of the present invention.
3 is a flowchart illustrating a parameter setting method according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order that those skilled in the art can easily carry out the present invention. In the following detailed description of the preferred embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In the drawings, like reference numerals are used throughout the drawings.

In addition, in the entire specification, when a part is referred to as being 'connected' to another part, it may be referred to as 'indirectly connected' not only with 'directly connected' . Also, to "include" an element means that it may include other elements, rather than excluding other elements, unless specifically stated otherwise.

1 is a schematic diagram showing a wireless communication system according to the present invention. Referring to FIG. 1, a wireless communication system may include a base station n and a terminal UE.

The terminal UE may be a GSM EDGE Radio Access Network (GERAN), a UMTS Terrestrial (UTRAN) terminal, a Personal Digital Assistant (PDA) Radio Access Network), or a LTE (Long Term Evolution) communication network. The terminal UE can be located inside the cell c and can access the wireless communication network through the base station n corresponding to each cell c. The cell c may be a local unit in which each base station n serves, and the large area may be composed of a plurality of small cells c. The base station (n) located in each cell (c) can perform a function of relaying the terminal device (UE) through a wireless communication network. Here, when the terminal UE moves from one cell to another, a handover may be performed between the base stations n corresponding to the respective cells. Accordingly, even when the terminal UE moves to different cells, the communication service for the terminal UE can be continuously provided.

Since the terminal UE and the base station n are connected by wireless communication, the communication quality provided by the terminal UE, the communication quality of the communication provided by the terminal UE, Speed and so on. That is, depending on the geographical characteristics such as the river or mountain included in each cell c, the degree of compactness of the high-rise building, the number of the UEs located inside, and the like, The size of noise or interference included in the communication signal between the base station n and the base station signal power (RSRP) can be changed. Therefore, the base station n may set different MCS (Modulation and Coding Scheme) schedules for the UEs according to the characteristics of the respective cells c, so that each of the UEs included in the cell c UEs to provide optimal throughput.

Specifically, the base station n can receive the channel quality indicator (CQI) from the terminal UE and collect wireless environment information such as noise and interference through a separate measuring device or the like have. In this case, the base station n may apply the delta CQI to the channel quality information (CQI) transmitted by the terminal UE to correct the channel quality information (CQI), and transmit the corrected channel quality information to the base station CQI Can be set. That is, the base station n may correct channel quality information according to the wireless communication environment, and then reset the MCS schedule of the base station n based on the base station CQI, which is the corrected channel quality information. The MCS schedule relates to a modulation scheme, a frequency channel, and a transmission rate allocated to each of the UEs, and the MCS schedule can be determined according to the base station CQI. Can be calculated.

Conventionally, parameter values such as delta CQI are set by directly performing performance tests and parameter changes in an experimental environment (Test Bed) or an actual cell having the same environmental conditions as those of each cell. However, it is difficult to keep the control variables of the signal-to-interference plus noise ratio (SINR) and the base station signal power (RSRP) constant in the experimental environment or the actual cell, There is a problem that it is difficult to carry out an experiment such as a test. In addition, after each delta CQI change, a performance test for confirming the result must be performed. Therefore, it takes a lot of time and effort to set the parameter.

2 is a block diagram showing a parameter setting apparatus 100 according to an embodiment of the present invention. 2, the parameter setting apparatus 100 according to an embodiment of the present invention may include a database unit 10 and a simulator unit 20, and the parameter setting apparatus 100 may include a base station n As shown in FIG.

Hereinafter, a parameter setting apparatus 100 according to an embodiment of the present invention will be described with reference to FIG.

The database unit 10 may store radio environment information of the cell and channel quality information (CQI) of the UE. The database unit 10 is capable of receiving radio environment information and channel quality information from a separate apparatus for collecting radio environment information of a cell or from a terminal apparatus UE, Quality information and the like can be stored. Here, the radio environment information may include signal-to-noise and interference ratio (SINR), interference, base station signal power (RSRP), and retransmission (Request Repeat), and the channel quality information (CQI) May measure the radio channel quality at the location where it is located and transmit it to the base station n.

Specifically, when the base station n provides a communication service to each terminal UE, the database unit 10 stores the radio environment information of the cell, channel quality information (CQI) transmitted from the terminal UE ), Delta CQI set by the base station, throughput of the base station, and the like can be collected and stored. Here, the database unit 10 may collect radio environment information, channel quality information (CQI), and the like during a predetermined reference period, and generate and store statistics on radio environment information and channel quality information during the reference period have. At this time, the database unit 10 can generate statistics on the radio environment information and the channel quality information for each cell on a day-by-day and a time-of-day basis. For example, SINR and RSRP included in the radio environment information After dividing, each 3-hour average can be saved as a statistical value. Alternatively, each radio environment information, channel quality information, and the like can be classified by each day of week, and an average of the day of week can be stored as a statistical value.

In addition, the database unit 10 may receive the channel quality information (CQI) and the block error rate (BLER) from the terminal UE, and may compare the channel quality information and the block error rate Can be collected and stored. Here, the channel quality information may be a value reflecting RSRP and SINR, and the block error rate may be a value reflecting retransmission and interference. In addition, the database unit 10 may store statistical values for the channel quality information and the block error rate instead of the channel quality information and the block error rate, and the statistical values may be values calculated for each cell, have.

The simulator unit 20 can perform simulation for deriving parameters based on radio environment information, channel quality information (CQI), and the like stored in the database unit 10. [ Specifically, the simulator 20 can calculate a spare base station CQI by applying a preset preliminary delta CQI to the channel quality information (CQI) stored in the database unit 10, (n). < / RTI > Here, the preliminary delta CQI may be a value that is arbitrarily set to extract an optimal processing rate, and a predetermined random function may be used to generate the preliminary delta CQI. The method of generating the preliminary delta CQI and the number of generated preliminary delta CQI may be different according to the input of the user. Therefore, the simulator 20 can reset the MCS schedule for each of the preliminary delta CQIs, and the radio environment information can always be constantly applied to the value stored in the database 10. That is, it is possible to perform simulation according to each preliminary delta CQI while maintaining the same control variables such as the same SINR and RSRP.

Thereafter, the simulator unit 20 can calculate the throughput of the base station n according to the reset MSC schedule by reflecting certain radio environment information stored in the database unit 10, It is possible to extract the preliminary delta CQI that provides the maximum processing speed among the throughputs according to the delta CQI. At this time, the simulator 20 can set the extracted preliminary delta CQI to the delta CQI of the base station n.

Meanwhile, according to the embodiment, the simulator unit 20 can extract the delta CQI based on the statistical value stored in the database unit 10. [ That is, the simulator 20 can derive a preliminary delta CQI value indicating an optimal processing rate by utilizing the statistical value. In this case, the simulator 20 calculates the preliminary delta CQI value for each cell, CQI can be set.

3 is a flowchart illustrating a parameter setting method in a wireless communication environment according to an embodiment of the present invention.

Referring to FIG. 3, a parameter setting method in a wireless communication environment according to an embodiment of the present invention may include a storing step S100, a simulation step S200, and a parameter setting step S300.

Hereinafter, a parameter setting method in a wireless communication environment according to an embodiment of the present invention will be described with reference to FIG.

In the storage step S100, the base station can collect and store the radio environment information of the cell and the channel quality information of the terminal device. Here, the radio environment information may include a Signal to Interference plus Noise Ratio (SINR), a Reference Signal Received Power (RSRP), an Interference, a Request Repeat have. The radio environment information may be collected from a measurement device separately provided in the cell, and the channel quality information may be received and collected from each terminal device included in the cell. In addition, in the storing step S100, the radio environment information and the channel quality information may be collected and stored for a predetermined reference period, and statistics on the radio environment information and channel quality information may be generated and stored for each day of the week or each time period. In the storing step (S100), the collected radio environment information and channel quality information may be stored in a storage means such as a database.

In the simulation step S200, the preliminary base station CQI may be calculated by applying a predetermined preliminary delta CQI to the stored channel quality information. Thereafter, the MCS schedule of the base station according to the calculated CQI can be reset by reflecting the radio environment information, and the processing speed of the base station according to the reset MCS schedule can be calculated. Here, the spare base station CQI may be calculated by adding a preliminary delta CQI to the channel quality information, and the preliminary delta CQI may be set to any value. For example, the preliminary delta CQI may be set to 0, 1, 2, 3, etc. Alternatively, the preliminary delta CQI may be derived by a predetermined random function or the like. Here, the method of generating the preliminary delta CQI and the number of generated preliminary delta CQIs may be set according to the input of the user.

Meanwhile, in the simulation step S200, the spare base station CQIs corresponding to the plurality of preliminary delta CQIs can be respectively calculated, and the MCS schedules according to the respective spare base station CQIs can be individually reset. Therefore, in the simulation step S200, the processing speed corresponding to each preliminary delta CQI can be calculated according to the individual MCS schedule for each spare base station CQI. Here, the MCS schedule may be set reflecting the stored radio environment information, and the control variables such as SINR and RSRP corresponding to the radio environment information may be maintained as a value stored in a storage means such as a database.

In the parameter setting step S300, a preliminary delta CQI that provides the maximum processing speed among the calculated processing rates may be extracted, and the extracted preliminary delta CQI may be changed to the delta CQI of the base station. Here, the parameter setting step S300 can extract the maximum processing speed based on the preliminary delta CQI excluding the delta CQI stored in the database. Thereafter, the maximum processing speed based on the preliminary delta CQI and the processing based on the delta CQI stored in the database The speed (current throughput) can be compared. In this case, the preliminary delta CQI can be set to the delta CQI of the base station only when the maximum processing speed by the preliminary delta CQI is faster than the processing speed by the delta CQI stored in the database (current processing speed).

According to another embodiment of the present invention, in the storing step, the base station can collect and store channel quality indicator (CQI) and block error rate (BLER) for a predetermined reference period from the terminal device. Here, the channel quality information may be a value reflecting RSRP and SINR, and the block error rate may be a value reflecting retransmission and interference. Here, the channel quality information and the block error rate may be statistical values for data measured over a predetermined reference period, and the statistical values may be values calculated for each cell, day of the week, and time.

Hereinafter, in the simulation step, the preliminary base station CQI may be calculated by applying a predetermined preliminary delta CQI to the stored channel quality information, and a modulation and coding scheme (MCS) schedule of the base station may be calculated according to the preliminary base station CQI and the block error rate. You can reset it. Accordingly, in the simulation step, the throughput of the base station according to the reset MCS schedule can be calculated, and the processing speed for each of the different preliminary delta CQIs can be calculated.

In the parameter setting step, a preliminary delta CQI that provides the maximum processing speed among the calculated processing speeds can be extracted, and the extracted delta CQI can be set as the delta CQI in the base station.

The present invention is not limited to the above-described embodiments and the accompanying drawings. It will be apparent to 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.

c: cell n: base station
UE: terminal device 10:
20: Simulation section 100: Parameter setting device
S100: Save step S200: Simulation step
S300: Parameter setting step

Claims (9)

A base station collecting and storing radio environment information of a cell and channel quality indicator (CQI) of a terminal apparatus;
Calculating a preliminary base station CQI by applying a preset preliminary delta CQI to the stored channel quality information, resetting a Modulation and Coding Scheme (MCS) schedule of the base station according to the stored radio environment information and the calculated preliminary base station CQI, A simulation step of calculating a throughput of the base station according to the reset MCS schedule; And
Extracting a preliminary delta CQI that provides a maximum processing rate among the calculated processing rates, and changing the extracted preliminary delta CQI to a delta CQI of the base station.
2. The method of claim 1,
(BS) in a wireless communication environment in which at least one of a signal to interference plus noise ratio (SINR), a reference signal received power (RSRP), and interference is stored as the wireless environment information How to set parameters.
2. The method of claim 1,
Collecting the radio environment information and channel quality information during a predetermined reference period, and collecting and storing statistics for each day of the week or each time period.
2. The method of claim 1, wherein the step of simulating
A parameter in a wireless communication environment for calculating respective preliminary base station CQIs using a plurality of preliminary delta CQIs and individually resetting an MCS schedule for the preliminary base station CQI to calculate a processing rate corresponding to the preliminary delta CQI, How to set it up.
2. The method of claim 1, wherein the step of simulating
And adding the preliminary delta CQI to the channel quality information to calculate the spare base station CQI.
2. The method of claim 1, wherein the step of simulating
And deriving the preliminary delta CQI using a predetermined random function.
The method according to claim 1, wherein the parameter setting step
Comparing the maximum processing speed based on the extracted preliminary delta CQI with a current processing speed of the base station, and if the maximum processing speed based on the preliminary delta CQI is greater than the current processing speed of the base station, CQI in a wireless communication environment.
A base station collecting and storing channel quality indicator (CQI) and block error rate (BLER) from a terminal device for a predetermined reference period;
Calculating a preliminary base station CQI by applying a predetermined preliminary delta CQI to the stored channel quality information, resetting a modulation and coding scheme (MCS) schedule of the base station according to the preliminary base station CQI and the block error rate, A simulation step of calculating a throughput of the base station according to a schedule; And
Extracting a preliminary delta CQI that provides a maximum processing rate among the calculated processing rates, and setting the extracted delta CQI as a delta CQI in the base station.
A database unit including radio environment information of the cell and channel quality indicator (CQI) of the terminal apparatus; And
Calculating a preliminary base station CQI by applying a preset preliminary delta CQI to the stored channel quality information, resetting a Modulation and Coding Scheme (MCS) schedule of the base station according to the stored radio environment information and the calculated preliminary base station CQI, And a simulation unit for calculating a throughput of the base station according to the reset MCS schedule to extract a preliminary delta CQI that provides a maximum processing speed.
KR1020140113378A 2014-08-28 2014-08-28 Apparatus and method for determining parameters in wireless communication environments KR20160025907A (en)

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