KR102375631B1 - Method and apparatus for controlling modem - Google Patents

Abstract

The present invention relates to a method and apparatus for controlling a modem in a wireless communication system.
A method according to an embodiment of the present invention provides a method for controlling an operation of a modem in a terminal in a wireless communication system, the method comprising: generating at least one parameter related to the operation of the modem; storing the at least one parameter; generating modem control information based on specific information of the terminal; and controlling the modem based on the modem control information.

Description

Modem control method and apparatus in a wireless communication system {METHOD AND APPARATUS FOR CONTROLLING MODEM}

The present invention relates to a method and apparatus for controlling a modem in a wireless communication system.

In accordance with the rapid growth of the mobile communication industry, a next-generation wireless communication system capable of providing high-speed data and image services as well as a general voice service is emerging in the wireless communication system, and standardization work is being done for this.

In a wireless communication system, information on a wireless communication environment is measured and collected for operation control of a modem of a mobile terminal. For example, in a wireless communication system, a cell search and signal quality measurement for a base station surrounding a coverage area are continuously performed to select a base station with better reception performance and repeat the same.

As described above, the conventional modem acquires information necessary for transceiver operation control through the same method every time. Time delay according to repetitive operation and reliability of measurement information affect the performance of the modem.

Accordingly, there is a need for a method for improving the performance of a transceiver of a modem.

The present invention provides an apparatus and method for improving the performance of a transceiver of a modem in a wireless communication system.

The present invention provides an apparatus and method for improving the performance of a transceiver of a database-based modem in a wireless communication system.

A method according to an embodiment of the present invention provides a method for controlling a modem of a terminal in a wireless communication system, the method comprising: generating modem control information based on information related to a wireless communication environment; updating the priority of modem control information stored in the database of the terminal using any one of the changed time and location when any one of the time and the location is changed; and controlling the modem of the terminal based on the updated priority modem control information.

An apparatus according to an embodiment of the present invention provides an apparatus for controlling a modem of a terminal in a wireless communication system, comprising: a generator for generating modem control information based on information related to a wireless communication environment; and when any one of time and location is changed, the priority of the modem control information stored in the database of the terminal is updated using any one of the changed time and location, and the priority is updated based on the updated modem control information and a control unit for controlling the modem of the terminal.

The present invention can increase the reliability of measurement information in a wireless communication system and improve the transmission/reception performance of the terminal.

The present invention can reduce time delay due to repetitive operations in a wireless communication system and shorten access time to a base station.

1 is an example of a wireless communication system to which the present invention is applied;
2 is another example of a wireless communication system to which the present invention is applied;
3A and 3B are flowcharts illustrating a database-based information collection and modem control method according to an embodiment of the present invention;
4 is a block diagram illustrating an interface between a terminal modem and a database according to an embodiment of the present invention;
5 is an operation flowchart of a terminal according to a first embodiment of the present invention;
6 is an operation flowchart of a terminal according to a second embodiment of the present invention;
7 is an operation flowchart of a central management server (CMS) according to a first embodiment of the present invention;
8 is an exemplary diagram of a database according to the first and second embodiments of the present invention;
9 is a graph for comparing serving cell frequency offset estimation performance according to an embodiment of the present invention; and
10 is a graph comparing interference cell frequency offset estimation performance 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 this case, it should be noted that in the accompanying drawings, the same components are denoted by the same reference numerals as much as possible. In addition, detailed descriptions of well-known functions and configurations that may obscure the gist of the present invention will be omitted.

In addition, the terms or words used in the present specification and claims described below should not be construed as being limited to conventional or dictionary meanings, and the inventor uses the concept of terms to describe his invention in the best way. Based on the principle that it can be appropriately defined, it should be interpreted as meaning and concept consistent with the technical idea of the present invention.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

An embodiment of the present invention is a Long-Term Evolution (LTE) wireless communication system, Long-Term Evolution-Advanced (LTE-A, hereinafter referred to as 'LTE') LTE-A') a wireless communication system, a high speed downlink packet access (HSDPA, hereinafter referred to as 'HSDPA') a wireless communication system, and a high speed uplink packet access (high speed downlink packet access) uplink packet access: HSUPA, hereinafter referred to as 'HSUPA') wireless communication system, and high-speed packet data of the 3rd generation project partnership 2 (3 ^rd generation project partnership 2: 3GPP2, hereinafter referred to as '3GPP2') high rate packet data: HRPD, hereinafter referred to as 'HRPD') a wireless communication system, and a 3GPP2 wideband code division multiple access (WCDMA: Wideband Code Division Multiple Access, hereinafter referred to as 'WCDMA') wireless communication system; , 3GPP2 Code Division Multiple Access (CDMA: Code Division Multiple Access, hereinafter referred to as 'CDMA') wireless communication system, and the International Institute of Electrical and Electronics Engineers (IEEE: Institute of Electrical and Electronics Engineers, hereinafter referred to as 'IEEE') 802.16m communication system, Evolved Packet System (EPS, hereinafter referred to as 'EPS'), and Mobile Internet Protocol (Mobile Internet Protocol: Mobile IP, hereinafter referred to as 'Mobile IP') It goes without saying that it is applicable to various communication systems, such as a system.

The terminal in the present invention may be, as an example, a personal digital assistant (PDA) having a communication function, a smart phone, a mobile phone, a tablet computer, a notebook computer, and the like.

When a modem is powered on in a wireless communication system, transmission timing offset information and frequency offset information for a received signal are estimated and corrected through initial synchronization. In addition, cell identification information is collected and selected through a cell searcher. Thereafter, information on the selected serving cell is received, and signal strength of the corresponding cell and neighboring cells is continuously measured. After going through this series of processes, a cell connection is attempted.

In the LTE system, the terminal receives a primary synchronization channel (P-SCH) and a secondary synchronization channel (S-SCH) from the base station, synchronizes with the base station, and obtains information such as cell ID. there is. Thereafter, the terminal may receive a physical broadcast channel from the base station to obtain broadcast information in the cell. Meanwhile, the UE may receive a downlink reference signal (DL RS) in the initial cell search step to check the downlink channel state. The cell search process in this LTE system is also repeatedly performed in the same way.

After the initial cell search, the UE receives a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to information carried on the PDCCH to obtain more specific system information. can do.

In addition, after cell access, measurement of signal-to-noise ratio (SNR) related to signal quality and Doppler frequency and delay spread corresponding to statistical characteristics of a radio channel to improve reception performance This is done. As described above, the modem may store and manage various types of synchronization and measurement information including cell information. However, when the modem is powered off or switched to an idle mode, most of the information is initialized. In addition, in order to enter the connected mode again, the same process as above is performed every time, so an operation delay is unavoidable. In particular, in a cell-dense area, a longer measurement time may be required because synchronization and cell search time are delayed due to inter-cell interference, and reliability of various measurement information is highly likely to be deteriorated. In addition, even in poor communication environments such as cell shadow areas, abnormal repeater installation areas, areas with poor performance of base station equipment, and areas with unstable networks, the conventional modem cannot cope with the situation and suffers the same trial and error every time.

The time required for the repeated operation of the modem and the reliability of measurement information are directly related to the modem performance.

Therefore, according to the present invention, various operation-related information experienced by the modem (ie, modem control information) is separately stored and managed as a database, and control information of the modem is provided in advance before reaching a specific point in time or a specific location. The performance of the transceiver can be improved by reducing the required overall time loss and increasing the measurement reliability. Here, various operation-related information experienced by the modem includes, for example, cell information according to the spatial location of the terminal, transmission/reception signal strength and frequency offset for each cell, various radio channel measurement information, amount of interference according to time, optimal transmission signal strength and timing information, etc. includes

The present invention includes a method of classifying control information of a modem according to spatial location information and time information of a terminal, storing it through a memory, and managing it as a database.

The first embodiment of the present invention shows an example of a method in which a terminal transmits information managed by the database to an external central management server (CMS) of the terminal, and shares it with other terminal modems and updates the information. Here, the CMS may be a server built by a service provider or a server of a terminal/modem manufacturer. A first embodiment of the present invention proposes a method of acquiring modem control information required for modem control of a terminal through a separate database.

The second embodiment of the present invention shows an example of a modem control method in the case of establishing a database inside the terminal. That is, the second embodiment of the present invention proposes a method of acquiring modem control information required for modem control of the terminal through a database in the terminal.

According to an embodiment of the present invention, all information managed as a database is periodically transmitted in advance in consideration of the location and reference time of the terminal, and the modem can minimize time loss due to repetitive operation through such information as well as adjacent cells Reliability of various measurement values can be increased and reception performance can be improved by utilizing information on interference. In addition, even when the performance of the terminal is deteriorated or abnormal operation is performed due to the surrounding geographical environment or special communication situation, if information on a countermeasure is received in advance, trial and error can be reduced, thereby contributing to the improvement of the terminal's performance.

That is, the embodiment of the present invention provides various operation-related information experienced by the modem, for example, cell information according to the spatial location of the terminal, transmission/reception signal strength and frequency offset for each cell, various radio channel measurement information, the amount of interference over time, The purpose of this is to store optimal transmission signal strength and timing information in a separate memory and manage it as a database to provide performance improvement information in advance before reaching a specific location or a specific point in time.

When the memory is located only inside the modem, it is applicable only to the modem. However, if the database is integrated and managed through a separate server, information sharing with other modems is also possible.

Hereinafter, in the present specification, contents related to the present invention will be described in detail through examples.

1 shows an example of a wireless communication system to which the present invention is applied.

The wireless communication system of FIG. 1 includes three adjacent cells, that is, Cell 1 ( 10 ), Cell 2 ( 20 ), and Cell 3 ( 30 ) and three terminals connected to each cell, that is, UE 1 ( 11 ). ), including UE 2 (21), UE 3 (31).

Among the three terminals, UE 3 (31) is connected to Cell 3 (30) without interference. However, the UE 2 (21) connected to the Cell 2 (20) is being interfered with by the adjacent Cell 3 (30), the UE 1 (11) connected to the Cell 1 (10) is the adjacent Cell 2 (20). ) and Cell 3 (30).

In the cellular-based wireless communication system of FIG. 1 , it is shown that interference conditions may vary depending on the location of the terminal.

UE 1 11 and UE 2 21 of FIG. 1 estimate and remove interference of a control signal or data traffic signal at a cell boundary point. In this case, UE 1 11 and UE 2 21 measure their own coordinate information to obtain location information (modem control information). It can be seen from FIG. 1 that interference is small and large according to the acquired location information.

According to the first embodiment of the present invention, the acquired location information is transmitted to the CMS, managed by the SDB, and used to control the modem based on the priority of the modem control information updated by the CMS.

According to the second embodiment of the present invention, the acquired location information is stored and managed in the terminal's own IDB, and is used to control the modem based on the priority of the updated modem control information.

2 shows another example of a wireless communication system to which the present invention is applied.

In the wireless communication system of FIG. 2 , UE 1 11 located in the same position as in FIG. 1 is connected to Cell 3 30 rather than Cell 1 10 in a specific time interval. Since the data transmission traffic of Cell 1 ( 10 ) and Cell 2 ( 20 ) has relatively increased, it is advantageous for UE 1 ( 11 ) to access Cell 3 ( 30 ).

In the cellular-based wireless communication system of FIG. 2 , the amount of inter-cell traffic and interference conditions may vary according to a specific time.

UE 1 11 of FIG. 2 estimates and removes interference of a control signal or data traffic signal at a cell boundary point. At this time, UE 1 ( 11 ) and UE 2 ( 21 ) obtain time information (modem control information) by measuring a specific time. It can be seen from FIG. 2 that interference is small and large according to the acquired time information.

According to the first embodiment of the present invention, the acquired time information is transmitted to the CMS, managed by the SDB, and used to control the modem based on the priority of the modem control information updated by the CMS.

According to the second embodiment of the present invention, the acquired time information is stored and managed in the terminal's own IDB, and is used to control the modem based on the priority of the updated modem control information.

In the first and second embodiments of the present invention, if information on an interference situation as in the example of FIGS. 1 and 2 is obtained in advance, modem adaptation time to interference can be shortened and performance can be improved.

3A and 3B are flowcharts illustrating a database-based information collection and modem control method according to an embodiment of the present invention.

3A and 3B are flowcharts showing an example of a method of managing modem control information collected through UEs as a database and utilizing it.

Data 1 210 , Data 2 220 , and Data 3 230 to be described below are implemented in the form of a database.

First, information provided by UE 1 100 is stored in Data 1 210 in the CMS as follows. The location information 111 of the terminal by the location tracking unit 110 is stored in the Data 1 210 in the form of a coordinate value.

The cell information 121 by the cell search unit 120 is stored in the Data 1 210 in the form of a cell identification value (cell ID).

Various types of synchronization information 131 by the synchronization unit 130 are stored in Data 1 210 in the form of time offset and frequency offset values.

Various types of measurement information 141 by the measurement unit 140 are stored in the data 1 210 in the form of signal strength and channel statistical characteristic values.

Other modem control information 151 by the adaptive modem controller 150 is stored in the Data 1 210 in the form of a bitmap. At this time, the corresponding time information is also stored in Data 1 210 at the same time.

Although not described in FIGS. 3A and 3B , the information provided by the UE 1 100 further includes a channel estimator control parameter provided by the channel estimator and a demodulator control parameter provided by the demodulator.

Next, UE 1 100 may use information managed as a database as follows.

When the CMS 200 receives the new location information 112 of the terminal obtained from the location tracking unit 110, it transmits the information of the Data 2 220 to the UE 1 100 based on the statistical data for the corresponding time. do. The information of Data 2 220 includes a cell identification value that is the cell information 122, a time and frequency offset value that is the synchronization information 132, a signal strength and a channel statistical characteristic value that is the measurement information 142, and control information of the modem ( 152) and the like.

The adaptive modem controller 150 operates the cell search unit 120 , the synchronizer 130 , the measurement unit 140 and the like based on the information 122 , 132 , 142 , and 152 . shorten and improve measurement performance.

On the other hand, when the other UE 2 300 transmits the location information 311 obtained from the location tracking unit 310 to the CMS 200, the information of the Data 3 230 can be shared. In this case, the information of Data 3 230 includes a cell identification value that is the cell information 321 , a time and frequency offset value that is the synchronization information 331 , a signal strength and a channel statistical characteristic value that is the measurement information 341 , and modem control information. (351).

The adaptive modem control unit 350 reduces the operation time of the cell search unit, the synchronization unit, the measurement unit, etc. in the UE 2 300 and improves the measurement performance based on the information 321 , 331 , 341 , 351 . plays a role

The database shown in the example of FIGS. 3A and 3B includes information on not only downlink but also uplink signals. For example, the information on the uplink signal includes an optimal transmission timing and optimal signal strength of the uplink signal, and frequency offset information for a serving cell base station.

The position tracking units 110 and 310 shown in the example of FIGS. 3A and 3B may be implemented by a global positioning system (GPS) or an observed time difference of arrival (OTDOA) estimator. Also, the location tracking units 110 and 310 provide location information that may include time, speed, distance, and/or direction of the modem. The location information includes location, such as latitude and longitude coordinates, in relation to the time, direction and/or speed of the modem at the particular location.

4 is a block diagram illustrating an interface between a terminal modem and a database according to an embodiment of the present invention.

The location tracking unit 110 tracks the location information 111 of the terminal in the form of a coordinate value. The cell search unit 120 searches for the cell information 121 in the form of a cell identification value (cell ID).

The synchronization unit 130 manages and/or processes various types of synchronization information 131 in the form of time offset and frequency offset values.

The measurement unit 140 measures and/or manages the measurement information 141 in the form of a signal strength and a statistical characteristic value of a channel.

Referring to FIG. 4 , the information described in the example of FIGS. 3A and 3B may be managed as a shared database (SDB) 201 through the CMS 200, but an individual database (IDB) ( 190) can also be managed. That is, the adaptive modem control unit 150 is necessary for the location tracking unit 110 , the cell search unit 120 , the synchronization unit 130 , the measurement unit 140 , the channel estimation unit 160 , and the demodulator 170 . As in the first embodiment of the present invention, information is received from the SDB 201, or as in the second embodiment of the present invention, information is received from the IDB 190 and each block 110, 120, 130, 140 , 160, 170). In addition, the classifying unit 180 converts the output values of each block 110 , 120 , 130 , 140 , 160 , 170 and values necessary for operation control into grouping data to form the SDB 201 or the IDB 190 . forward to Here, the control information 151 necessary for operation control includes controlling the channel estimator 160 and the demodulator 170 .

5 is an operation flowchart of a terminal according to the first embodiment of the present invention.

In the first embodiment of the present invention, an example of a method in which the terminal transmits information managed by the database to a CMS external to the terminal to share and update information with other terminal modems is shown.

The terminal generates modem control information in step 501 . Here, the modem control information includes, for example, location information 111, cell information 121, synchronization information 131, measurement information 141, and other modem control information 151 described in FIG. 3A. Modem control information in the present invention can be utilized by combining the above modem control information.

The terminal transmits the modem control information generated in step 503 to the CMS.

Thereafter, the terminal receives updated information from the CMS in step 505 .

The updated information in the present invention may include new location information, new time information, and wireless communication environment information. Additionally, the updated information of the present invention may include other information in addition to new location information, new time information, and wireless communication environment information.

6 is an operation flowchart of a terminal according to a second embodiment of the present invention.

The second embodiment of the present invention shows an example of a modem control method in the case of establishing a database inside the terminal.

The terminal generates modem control information in step 601 . Here, the modem control information includes, for example, location information 111, cell information 121, synchronization information 131, measurement information 141, and other modem control information 151 described in FIG. 3A. In the present invention, modem control information can be combined and utilized.

The terminal determines whether specific information (eg, new location information) has been recognized and/or generated based on the received modem control information in step 603 . If new location information is not recognized and/or created, the corresponding information is not separately stored or managed. However, when new location information is recognized and/or generated, the terminal is stored and/or managed as an IDB in step 605 .

Thereafter, the terminal determines whether to update the priority of the modem control information of the terminal in step 607 .

If there is no need to update the priority of the modem control information of the terminal, it waits until there is a need to update (ie, it waits as a lower priority). However, if it is necessary to update the priority of the modem control information of the terminal, the terminal updates the priority of the modem control information of the terminal stored in step 609 .

Thereafter, in step 611 , the terminal controls the modem based on the updated modem control information.

In addition, although not shown in the flowchart, modem control information that is no longer used or is rarely used may be deleted under various judgment conditions.

7 is a flowchart illustrating an operation of a central management server (CMS) according to the first embodiment of the present invention.

Referring to FIG. 7 , the CMS receives modem control information generated from the terminal in step 701 .

The CMS determines whether specific information (eg, new location information) is recognized based on the received modem control information in step 703 . If new location information is not recognized, the CMS is not separately stored or managed.

However, when the new location information is recognized, the CMS is stored and/or managed as an SDB in step 705 .

Thereafter, the CMS determines whether to update the priority of the terminal's modem control information stored in the SDB in step 707 .

If there is no need to update the priority of the modem control information of the terminal, it waits until there is a need to update the priority of the modem control information of the terminal. However, if there is a need to update, the CMS updates the priority of the modem control information of the terminal stored in step 709 .

Thereafter, the CMS transmits the modem control information whose priority is updated in step 711 to the terminal.

In addition, although not shown in the flowchart, modem control information that is no longer used or is rarely used may be deleted under various judgment conditions.

8 is an exemplary diagram of a database according to the first and second embodiments of the present invention.

The database 800 according to the first and second embodiments of the present invention is an exemplary diagram of, for example, group 37. FIG.

For example, in the database 800, 0 is location, 1 is human, 10 is signal strength, 13 is signal-to-noise ratio (SNR), 14 is signal-to-interference ratio (SIR), 20 is maximum delay path, 21 is Doppler frequency, and 22 is Initial timing offset, 23 is initial frequency offset, 24 is channel status indicator, 30 is synchronization control parameter 0, 31 is synchronization control parameter 1, 32 is synchronization control parameter 2, 40 is channel estimator control parameter 0, 41 No. is channel estimator control parameter 1, No. 42 is channel estimator control parameter 2, No. 50 is demodulator control parameter 0, No. 51 is demodulator control parameter 1, No. 52 is demodulator control parameter 2, No. 60 is other control parameter 0, No. 61 is Other control parameters 1 and 62 consist of other control parameters 2, etc.

In the present invention, modem control information stored in the database can be combined and utilized.

In another embodiment of the present invention, it is possible to share information between terminals through a dedicated application of an operator or terminal. That is, in another embodiment of the present invention, by executing a specific application of the terminal, as shown in FIGS. 3A and 3B between terminals, the terminal location information 111, cell information 121, synchronization information 131, various measurement information ( 141), and other modem control information 151 may be transmitted/received.

When a specific application is executed in the terminal, at least one parameter related to the operation of the modem of the terminal is generated, and the at least one parameter is transmitted to the CMS. Thereafter, the CMS determines whether it is necessary to update the priority of the modem control information of the terminal based on the information in the SDB, and when it is necessary to update the priority, the modem control information with the updated priority is transmitted to the terminal. Thereafter, the terminal controls the modem based on the updated priority modem control information. The at least one parameter may include at least one of cell information according to the location of the terminal, transmission/reception signal strength for each cell, frequency offset, radio channel measurement information, interference amount information according to time, optimal transmission signal strength, and optimal transmission timing information. includes one

9 is a graph comparing serving cell frequency offset estimation performance according to an embodiment of the present invention.

9 shows the conventional estimation performance Conventional 910 for the serving cell frequency offset Target 900 A value targeted by the terminal's modem and the performance estimation performance Proposed 920 according to the present invention. Most of the frequency offset estimator (or synchronizer) passes through an infinite impulse response (IIR) filter to improve jitter performance. In order to estimate the value of A, which is , gradual tracking is performed starting with the initial value of C. Here, the value of C is mostly set to 0, and the overall convergence time takes T ₁ .

Meanwhile, the adaptive modem control unit 150 of the present invention sets an initial value using the serving cell frequency offset information B value obtained from the database, and then passes through the IIR filter. Therefore, the overall convergence time takes T ₂ , and the time by T _{1 -} T ₂ can be shortened compared to the conventional estimator.

10 is a graph comparing interference cell frequency offset estimation performance according to an embodiment of the present invention.

FIG. 10 shows the conventional estimation performance Conventional 1010 and the performance estimation performance Proposed 1020 according to the present invention with respect to the frequency offset target 1000 value A for an interference cell targeted by the modem of the terminal.

9 shows the tracking performance for a transient state, while FIG. 10 shows the jitter performance for a steady state. When there is an interfering cell, the signal of the serving cell rather interferes in the frequency offset estimation process for the interfering cell, and thus the estimation accuracy for the corresponding frequency offset is deteriorated. Therefore, steady-state jitter performance becomes a more important indicator than overall convergence time. In general, the larger the coefficient of the IIR filter, the shorter the convergence time and the lower the steady-state jitter performance. . Therefore, in the case of the conventional estimator, it is not possible to reduce the filter coefficients only for the steady-state jitter performance. However, since the adaptive modem control unit 150 of the present invention can apply the interference cell frequency offset information B value obtained from the database as an initial value, it is possible to improve steady-state jitter performance by reducing filter coefficients while the overall convergence time is reduced. can While the conventional estimated jitter value is σ ₁ , the estimated jitter value of the present invention is σ ₂ , and an error of σ _{1 -} σ ₂ can be reduced.

In addition to the frequency offset estimation technique shown in FIGS. 9 and 10 , various types of information obtained from the database may improve modem performance in various forms through the adaptive modem control unit 150 . For example, cell information (or cell identification information) shortens the time required to search for neighboring cells, and signal strength information according to location reduces the frequency of handovers to minimize unnecessary time loss as well as the overall data rate can also be improved. In addition, since the optimal timing information and frequency offset information for uplink transmission improve the reception performance of the base station, not only the uplink data rate improvement but also the downlink performance degradation due to the automatic repeat request (ARQ) response failure can be minimized. . In addition, statistical characteristic information of a radio channel such as Doppler frequency and delay spread may shorten a convergence time according to estimation and increase estimation accuracy, and may also improve the performance of a channel estimator that requires each estimated value. In this way, all information necessary for modem operation can be more effective in a cell-dense area with severe interference from adjacent cells.

In addition, when there is a shadow area of a cell in which communication is almost impossible, a countermeasure can be delivered in advance in case the terminal enters the shadow area. For example, if the channel state information is adjusted to inform in advance of the low quality state, the base station can change the TM (Transmission Mode) or lower the MCS (Modulation and Code Rate) to transmit a signal in a form that is easy to receive. In addition, the terminal itself quickly changes the communication method from 4G LTE to Wi-Fi or 3G high speed downlink packet access (HSDPA) through advance information on the shaded area, thereby reducing unnecessary frequent cell access attempts and power consumption. can also be minimized.

In addition, if there is a repeater around the terminal and the transmission timing delay of the repeater is abnormally large compared to the macro cell, signal quality deterioration due to timing synchronization error or intersymbol interference due to multipath channel delay ( Inter-symbol interference: It is possible to cope with the signal quality degradation caused by ISI in advance. For example, from the viewpoint of timing synchronization, if the terminal knows in advance the statistical characteristics of the repeater channel path, frequent transmission timing synchronization changes can be prevented, and the terminal with the ISI removal function can make a decision on whether to remove the ISI more quickly and be able to do it accurately.

In addition, if there is an abnormality in the measured SNR, such as an abnormal situation in which the reception performance is deteriorated even though the SNR is not low, or a situation in which a sudden SNR degradation phenomenon is repeated at a certain period, when the information is transmitted to the database, it is compared with the pattern existing in the database. When a similar pattern exists, control information for a countermeasure may be notified to the terminal.

In addition, even when the communication environment is poor for various reasons, such as an area where the performance of base station equipment is poor or an area with an unstable network, if information about a countermeasure of the terminal is provided in advance, a more rapid response is possible.

The terminal may collect the information through the IDB and update countermeasures for each type. For example, after all information set to be managed as a database is stored at regular time intervals and a communication situation similar to a predetermined special communication environment is detected, the predefined modem control method items can be implemented one by one in a predetermined order. there is.

If the performance of the selected control method does not satisfy a specific condition, the corresponding control method may be adjusted in such a way that the execution priority is lowered. The present invention can be implemented through a separate storage device for managing the database and a separate device for interpreting information stored in the database and determining setting values for controlling the modem for each communication situation and type. In addition, the setting values may be transmitted to the adaptive modem controller in the modem to directly change a register or registry value, and other devices in the modem may be controlled through a separate command.

In addition, the information may be managed as an SDB through the CMS to update countermeasures for each type. For example, the terminal transmits information determined to be managed as a database to the CMS at regular time intervals, and when a communication situation similar to a predetermined special communication environment is detected in the CMS, the result of the final processing method is transmitted to the terminal and the modem can be implemented so that it can be quickly controlled. As another example, the terminal may limit the transmission of the information to the CMS only in a special situation predetermined in advance to reduce the amount of data transmission. In this way, when the database is managed through the CMS, there is an advantage in that various empirical information of various terminals can be collected. In addition, the terminal may consider a method of periodically receiving and updating modem control methods for a special communication environment and countermeasures from the CMS. In this way, all information managed as a database is periodically delivered in consideration of the location and reference time of the terminal, and may include a wide range of information about the location of the terminal and a specific time range. In addition, a method of collecting and transmitting information managed as a database may be established as a communication standard, or may be provided to a terminal irrespective of a communication standard. Accordingly, the present invention can be differentiated by providing the database only to terminals subscribed to a specific product or service, thereby improving modem competitiveness.

Meanwhile, it will be appreciated that the method and apparatus for controlling a modem in a wireless communication system according to an embodiment of the present invention can be realized in the form of hardware, software, or a combination of hardware and software. Any such software, for example, whether erasable or rewritable, may be stored in a volatile or non-volatile storage device such as a ROM, or a memory such as, for example, RAM, a memory chip, device or integrated circuit. , or an optically or magnetically recordable storage medium such as a CD, DVD, magnetic disk, or magnetic tape, and at the same time may be stored in a machine (eg, computer) readable storage medium. A modem control method in a wireless communication system according to an embodiment of the present invention may be implemented by a computer or a mobile terminal including a controller and a memory, wherein the memory is a program including instructions for implementing embodiments of the present invention or It will be appreciated that this is an example of a machine-readable storage medium suitable for storing programs.

Accordingly, the present invention includes a program including code for implementing the apparatus or method described in any claim of the present specification, and a machine (computer, etc.) readable storage medium storing such a program. Also, such a program may be transmitted electronically through any medium such as a communication signal transmitted through a wired or wireless connection, and the present invention suitably includes the equivalent thereof.

In addition, in the wireless communication system according to an embodiment of the present invention, the modem control apparatus may receive and store the program from a program providing apparatus connected by wire or wirelessly. The program providing apparatus includes a program including instructions for the program processing apparatus to perform a modem control method in a preset wireless communication system, a memory for storing information necessary for a modem control method in a wireless communication system, and the like; It may include a communication unit for performing wired or wireless communication with the device, and a control unit for automatically transmitting a corresponding program to the transceiver at a request of the program processing device or automatically.

Meanwhile, although specific embodiments have been described in the detailed description of the present invention, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims described below as well as the claims and equivalents.

Claims (32)

A method of a terminal in a wireless communication system, comprising:
generating modem control information based on information related to a communication environment;
transmitting the modem control information to a server;
When the generated modem control information includes the location information of the terminal, the estimated location of the terminal is determined based on the location information of the terminal, and updated modem control related to the estimated location of the terminal from the server receiving information; and
and performing communication using the updated modem control information.
According to claim 1,
The modem control information is
The method of controlling a modem of a terminal, comprising at least one of cell information of the terminal, signal strength for each cell, a frequency offset, a timing offset, radio channel measurement information, and interference information. According to claim 1,
The method of controlling a modem of a terminal, characterized in that the database is provided in one of the inside of the terminal and the outside of the terminal.
delete According to claim 1,
The method of controlling a modem of a terminal, characterized in that it further comprises the step of determining whether any one of the time and the location of the terminal has been changed.
delete delete delete delete A method of a central management server in a wireless communication system, comprising:
Receiving modem control information based on information related to a communication environment from a terminal;
determining an estimated location of the terminal based on the location information of the terminal when the modem control information includes location information of the terminal; and
and transmitting, to the terminal, updated modem control information related to the estimated location of the terminal.
11. The method of claim 10,
The modem control information is
The modem control method of the central management server, characterized in that it includes at least one of cell information of the terminal, signal strength for each cell, frequency offset, timing offset, radio channel measurement information, and interference information.
12. The method of claim 11,
The database is a modem control method of a central management server, characterized in that provided in one of the inside of the terminal and the outside of the terminal.
delete 11. The method of claim 10,
The modem control method of the central management server, characterized in that it further comprises the step of determining whether any one of the time and location of the terminal has been changed.
delete In a terminal in a wireless communication system,
transceiver; and
A control unit comprising: the control unit:
Generate modem control information based on information related to the communication environment,
Transmitting the modem control information to the server through the transceiver,
When the generated modem control information includes the location information of the terminal, the estimated location of the terminal is determined based on the location information of the terminal, and updated modem control related to the estimated location of the terminal from the server receive information through the transceiver;
A modem control apparatus of a terminal for performing communication using the updated modem control information.
17. The method of claim 16,
The modem control information is
The apparatus for controlling a modem of a terminal, comprising at least one of cell information of the terminal, signal strength for each cell, frequency offset, timing offset, radio channel measurement information, and interference information. 17. The method of claim 16,
The database is a modem control apparatus for a terminal, characterized in that provided in one of the inside of the terminal and the outside of the terminal.
delete 17. The method of claim 16,
The control unit is
The modem control apparatus of the terminal, characterized in that it is further configured to determine whether any one of the time and the location of the terminal is changed.
delete delete delete delete A central management server device in a wireless communication system, comprising:
transceiver; and
A control unit comprising: the control unit:
Receive modem control information based on information related to a communication environment from a terminal through the transceiver,
When the modem control information includes the location information of the terminal, determining the estimated location of the terminal based on the location information of the terminal,
Central management server device for transmitting updated modem control information related to the estimated position of the terminal to the terminal through the transceiver.
26. The method of claim 25,
The modem control information is
The central management server device, characterized in that it includes at least one of cell information of the terminal, signal strength for each cell, frequency offset, timing offset, radio channel measurement information, and interference information.
26. The method of claim 25,
The central management server device, characterized in that the database is provided in one of the inside of the terminal and the outside of the terminal.
delete 27. The method of claim 26,
The control unit is
The central management server device, characterized in that it is further configured to determine whether any one of the time and location of the terminal has been changed.
delete According to claim 1,
The updated modem control information comprises at least one of channel state information (CSI), interference information, and downlink configuration information (DCI).
11. The method of claim 10,
The updated modem control information comprises at least one of channel state information (CSI), interference information, and downlink configuration information (DCI).

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