KR20110133785A - System and method for processing signal in a wireless network - Google Patents

Abstract

PURPOSE: A call processing system in a wireless network and method thereof are provided to solve interference problems between a femto signal and a macro signal by improving handover rates about a femto cell and a macro cell. CONSTITUTION: A macro base station(100) divides the frequency band of a macro cell into two or more frequency domains. The macro base station uses data FA(Frequency Allocation) in order to process a data call using one or more frequency domains. A femto cell base station(200) processes the data call occurred in the femto cell using femto cell data FA including the frequency domain the same as the data FA of the macro base station. A voice call occurred at a portable terminal is processed.

Description

SYSTEM AND METHOD FOR PROCESSING SIGNAL IN A WIRELESS NETWORK}

The present invention relates to call processing in a wireless network, and more particularly, to process a data call of a mobile communication terminal in a macro cell including a plurality of femto cells into a frequency domain having the same frequency band in a femto cell and a macro cell. The present invention relates to a call processing system and method in a wireless network capable of processing a voice call into a frequency domain used in a macro cell.

As the technology of mobile communication evolves into the 2G, 3G, and 4G generations, the increase in transmission speed for wireless Internet access has become an important development factor.

In particular, WCDMA High Speed Packet Access (HSPA) guarantees a transmission speed that can provide a practical wireless Internet environment to users, and is currently commonly used in mobile communication networks.

In addition, wireless data services in the mobile communication market have recently been introduced through the launch of various wireless Internet terminals such as iPhones and smart phones, and data-driven marketing such as wireless data subscriptions and wireless data services for corporations. Is becoming more and more active.

However, the biggest limitation in the activation of such wireless data service is the capacity of the network providing the actual wireless data service, which is mainly limited by the limited channel capacity of the base station itself and the limitation of the wireless capacity in the coverage managed by the base station. The cause may be. In other words, the maximum radio capacity that can be given to all user terminals in one base station area is proposed, and thus, the actual transmission rate per subscriber decreases when data service is activated and more users use it at higher speed.

To solve this problem, devices that manage separate small cells such as micro cells, pico cells, femto cells, etc. have their own capacity with separate channel resources in a smaller area. To provide users with the system, the method of increasing the traffic capacity of the entire network level is being developed.

In particular, a femto cell refers to a small base station for mobile communication, i.e., a small base station having a low output, used indoors such as a home or an office, and provides a wired / wireless convergence service by connecting a mobile phone and the Internet to a user. Typically, the service area in a femto cell is about 20m radius. The femto cell improves the call quality in the room that the coverage of the macro cell does not cover or divides the macro cell load in the overload area, and has advantages such as reducing the communication cost for the user.

Femtocells use specialized technologies such as automatic self-configuration, addressing interference issues between macro and femtocells through automatic network planning as well as IP address configuration and security configuration. Doing. At this time, for automatic cell configuration, the femtocell should be able to operate in a detection mode during initialization or periodically. The detection mode acts as a terminal capable of searching for neighboring macro cells and femto cells to generate a neighbor cell list, set power saving control, frequency, and the like. You can share this information.

In the case of such a femto cell, a call of the mobile communication terminal in the area is processed using a femto frequency, which is a single carrier, and in the case of a macro cell, a call of the mobile communication terminal in the area is processed using a macro frequency, which is a multi-carrier.

However, in the case of a mobile communication network using a femto cell, since femto frequency signals and macro frequency signals are mixed, interference problems between femto frequency signals and macro frequency signals, handover problems, etc. exist as technical difficulties, and thus they are commonly used in commercial networks. There is a problem that can not be. For example, when the mobile communication terminal is handed over from the femto cell area to the macro cell area, there is a problem in that the handover does not occur or the success rate is lowered because the handover is performed while transitioning from the femto frequency, which is a single carrier, to one of the macro frequencies, which is a multicarrier. .

SUMMARY OF THE INVENTION An object of the present invention is to solve a conventional problem as described above, and an object of the present invention is to process a data call of a mobile communication terminal in a femto cell area using a frequency domain for processing a data call in a macro cell, and includes a macro including a femto cell. A call processing system and method in a wireless network capable of distributing and receiving data traffic in a femtocell having a separate channel capacity by processing voice calls of all mobile communication terminals in a cell using areas other than the frequency domain. To provide.

The object of the present invention is not limited to those mentioned above, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

A call processing system in a wireless network according to an embodiment of the present invention is a call processing system in a wireless network including a macro cell having at least one femto cell, and divides a frequency band of the macro cell into at least two frequency domains. A macro base station used as a data FA for processing a data call using at least one or more of the divided frequency domains, and a data base for a femto cell having the same frequency domain as the data FA in the macro base station. It includes a femto cell base station for processing a data call generated in the.

Call processing system in a wireless network according to an embodiment of the present invention can process a voice call generated in the mobile communication terminal in the femto cell to the frequency domain excluding the data FA.

In a call processing system in a wireless network according to an embodiment of the present invention, the macro base station uses the data FA when the mobile communication terminal to which the data call is connected through the data FA for the femto cell is handed over to the macro cell. The data call of the mobile communication terminal can be connected.

A call processing method in a wireless network according to an embodiment of the present invention is a call processing method in a wireless network composed of a macro cell having at least one femto cell, and at least two frequency bands of a frequency band managed by the macro cell. And use at least one or more of the divided frequency bands as a data FA for processing a data call, and if there is a voice call request of a mobile communication terminal in the femto cell area, the remaining frequency bands except for the data FA Processing the voice call using the data call; and processing a data call for the femto cell having the same frequency band as the frequency band of the data FA when a data call request is received from the mobile communication terminal in the femto cell area. do.

According to an exemplary embodiment of the present invention, a call processing method in a wireless network may process a data call of a mobile communication terminal using the data FA when the mobile communication terminal to which a data call is connected in the femto cell is handed over to the macro cell. have.

According to the present invention, a data call of a mobile communication terminal in a femto cell region is processed using a frequency domain for processing a data call in a macro cell, and voice calls of all mobile communication terminals in a macro cell including a femto cell are excluded from the frequency domain. By using another area, data traffic can be distributed and accommodated in femto cells having a separate channel capacity, thereby increasing the capacity for data traffic in terms of the entire network.

In addition, since the frequency bands of the data-first FA used by the femto cell and the macro cell are the same, the mobile communication terminal can perform the handover without the frequency transition process, thereby increasing the success rate of the handover. The interference problem between the macro signal and the femto signal can be solved.

1 and 2 are diagrams for explaining a preferred frequency allocation technique applied to an embodiment of the present invention.
3 is a diagram illustrating a wireless network structure for explaining a call processing system according to an exemplary embodiment of the present invention.
4 is a view for explaining the interference between signals during call processing of the call processing system according to an embodiment of the present invention.
5 is a flowchart illustrating a call processing process of a mobile communication terminal in a wireless network system according to an embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

In the following description 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. The following terms are defined in consideration of the functions in the embodiments of the present invention, which may vary depending on the intention of the user, the intention or the custom of the operator. Therefore, the definition should be based on the contents throughout this specification.

Combinations of each block of the accompanying block diagram and each step of the flowchart may be performed by computer program instructions. These computer program instructions may be mounted on a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment such that instructions executed through the processor of the computer or other programmable data processing equipment may not be included in each block or flowchart of the block diagram. It will create means for performing the functions described in each step. These computer program instructions may be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular manner, and thus the computer usable or computer readable memory. It is also possible for the instructions stored in to produce an article of manufacture containing instruction means for performing the functions described in each block or flowchart of each step of the block diagram. Computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operating steps may be performed on the computer or other programmable data processing equipment to create a computer-implemented process to create a computer or other programmable data. Instructions that perform processing equipment may also provide steps for performing the functions described in each block of the block diagram and in each step of the flowchart.

In addition, each block or step may represent a portion of a module, segment or code that includes one or more executable instructions for executing a specified logical function (s). It should also be noted that in some alternative embodiments, the functions mentioned in the blocks or steps may occur out of order. For example, the two blocks or steps shown in succession may in fact be executed substantially concurrently or the blocks or steps may sometimes be performed in the reverse order, depending on the functionality involved.

Prior to the description, an embodiment of the present invention uses preferred frequency allocation based technology, which is a frequency operation technique, for increasing capacity and improving quality in a macro network.

The preferred frequency allocation scheme is a structure in which CS calls, such as voice and video calls, and PS calls for wireless data are separated into respective frequency assignments, that is, dedicated frequencies of voice preference and data preference, as shown in FIG. It is a frequency operation method that can allocate channel separately to manage channel resource according to each characteristic and improve overall capacity and quality by reducing interference between voice / data call.

If the mobile communication terminal accesses the data call under the frequency allocation operating condition, the call is first connected to the data priority frequency, and in the case of voice, the voice is allocated to the voice frequency, and as a result, it is separated and operated for each frequency. In addition, as shown in FIG. 2, data or voice frequency allocation additionally supports a function of accommodating different types of calls by using mutual frequency allocation when load increases due to a plurality of mobile communication terminals. That is, when the frequency domain FA4, which processes data calls at the call processing frequencies operated by FA1, FA2, FA3, and F4, becomes full load, the other frequency domains FA1, FA2, and FA3 can accept the data call. will be

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

3 is a diagram illustrating a wireless network structure for explaining a call processing system according to an exemplary embodiment of the present invention.

As shown in FIG. 3, a wireless network according to an embodiment of the present invention includes a macro cell 1000 that represents a cell of a general cellular system, a macro base station 100 that manages the macro cell 1000, and A cell having a size smaller than that of the macro cell 1000 includes a femto cell 2000 that supports a small environment of a single house or a room of a single house and a femto base station 200 that manages the femto cell 2000. Here, the macro base station 100 may be an evolved NodeB (eNB), and the femto base station 200 may be a home evolved NodeB (eNB).

The femto cell 2000 is not only able to serve indoor and outdoor shadow areas, for example, in-building areas such as coffee shops, restaurants, offices, theaters, underground stores, shopping malls, etc., but also to provide a higher level of data service to more users. .

The macro base station 100 that manages the macro cell 1000 uses a specific frequency domain, for example, FA4, as a frequency domain for processing a data call, and uses FA1, FA2, and FA3 as a frequency domain for processing a voice call. That is, the macro base station 100 processes the voice call request of the mobile communication terminal in the macro cell 1000 using the voice priority FA1, FA2, FA3, and the pure macro except the femtocell 2000 using the data priority FA4. Processes the data call of the mobile communication terminal in the cell 1000 area.

The macro base station 100 processes data and voice calls by dividing a frequency band first using a frequency allocation technique, that is, processes a voice call or processes a data call using a plurality of macro frequency regions which are multicarriers. In other words, the macro base station 100 uses the frequency bands of FA1, FA2, FA3 to process voice calls, and uses the frequency band of FA4 to process data calls.

The femto base station 200 that manages the femto cell 2000 processes only data calls of mobile communication terminals in the femto cell 2000 area, that is, the same frequency as FA4 allocated by the macro base station 100 to process data calls. A data call request of a mobile communication terminal is processed using FA4 having a band.

In addition, when there is a voice call request from the mobile communication terminal in the femto cell 2000, the voice call is processed using the FA1, FA2, FA3 frequency bands of the macro base station 100.

In other words, the femto base station 200 in the femto cell 2000 processes the data call using a signal having the same frequency band as FA4 managed by the macro base station 100, and the macro base station 100 processes the femto cell 2000. The voice call request of the mobile communication terminal in the macro cell 1000 area including) is processed using FA1, FA2, and FA3.

As such, the femto base station 200 processes only a data call request of a mobile communication terminal in the femto cell 2000 using a femto frequency that is a single carrier.

The mobile communication terminal 10 according to an embodiment of the present invention recognizes the data priority FA signal managed by the femto base station 200 and the voice priority FA signal and data priority FA signal managed by the macro base station 100, The data priority FA managed by the femto base station 200 is used to process a data call in the femto cell 2000 area, and the voice priority FA signal managed by the macro base station 100 is used to process the voice call. That is, since the mobile communication terminal 10 knows the voice priority FA and the data priority FA, it uses a macro signal (voice priority FA) managed by the macro base station 100 in the case of a voice call, and finds only the data priority FA in the case of a data call. As shown in FIG. 2, a femto signal (data priority FA managed by the femto base station 200) is added to a macro signal (data priority signal managed by the macro base station 100) within the femto cell 2000 region. Because of the large size, the femto signal is used.

When the femto base station 200 and the macro base station 100 use the same frequency band FA4 to process the data call, interference between the femto frequency and the macro frequency may occur, but the embodiment of the present invention is illustrated in FIG. 4. Likewise, when the mobile communication terminal 10 in the femto cell 2000 region wants to connect a data call, the FA4 output from the femto base station 200 is more than the FA4 signal for data call processing output from the macro base station 100. Since the signal is relatively large, the mobile communication terminal 10 acquires an FA4 signal transmitted from the femto base station 200 in the femto cell 2000 area, connects a data call, and in the case of a voice call, the data is transmitted from the femto base station 200. Since only a signal for processing a call is provided, the mobile communication terminal 10 uses a frequency for voice call processing provided from the macro base station 100. Using the signal of FA1, FA2, FA3, connect a voice call.

A handover procedure in a wireless network system according to an embodiment of the present invention will be described below.

In the femtocell 2000 according to an embodiment of the present invention, a mobile communication terminal uses only a frequency band FA1, FA2, FA3 that processes a voice call managed by the macro base station 100 in the macro cell 1000. Since a voice call of the mobile communication terminal handed over from the femto cell 2000 to the macro cell 1000 is not required, a separate handover procedure is not required. In the case of a data call, the data call is processed in the macro cell 1000. Since the frequency band for processing and the frequency band for processing a data call in the femto cell 2000 are the same, handover is possible without a frequency shift.

According to an embodiment of the present invention, the femto base station 200 processes the data call of the mobile communication terminal in the femto cell 2000 area, and of all the mobile communication terminals in the macro cell 1000 including the femto cell 2000. By processing the voice call in the macro base station 100, the data traffic can be distributed and accommodated in the femtocell 2000 having a separate channel capacity, thereby increasing the capacity for data traffic in terms of the entire network.

A process of processing a call of a mobile communication terminal in a cell area by the wireless network system having the above configuration will be described with reference to FIG. 5.

5 is a flowchart illustrating a call processing process of a mobile communication terminal in a wireless network system according to an embodiment of the present invention.

Prior to description, FIG. 5 illustrates a case where the mobile communication terminal 10 performs a call processing to the femto cell 2000 area and is handed over to the macro cell 1000 as an example.

As shown in FIG. 5, the mobile communication terminal 10 receives radio resource information FA1, FA2, FA3, and FA4 from the macro base station 100 of the macro cell 1000 in step S500, and then, in the macro cell 1000. It is aware of the information of available radio resources.

In this state, when the mobile communication terminal 10 has a voice call processing request (S502) in the femto cell 2000 area, the macro base station 100 requests a voice call of the mobile communication terminal 10 in the femto cell 2000 area. Is processed after receiving using one of FA1, FA2 and FA3 (S504).

On the other hand, when the mobile communication terminal 10 requests data call processing in the femtocell 2000 region (S506), the signal (FA1 for data femtocell) of the FA4, which is a data priority FA managed by the femto base station 200, is a macro. Since it is larger than FA4, which is a data priority FA managed by the base station 100, the mobile communication terminal 10 requests a data call using the data priority FA for femto cell managed by the femto base station 200, and thus the femto base station 200 ) Processes the data call request using the data priority FA for the femto cell (S508).

Meanwhile, when the mobile communication terminal 10 to which the data call is connected is handed over from the femto cell 2000 area to the macro cell 1000 area (S510), the femto base station 200 performs the macro base station 100 through a handover procedure. The mobile communication terminal 10 requests the handover by transmitting the information of the mobile communication terminal 10. Accordingly, the mobile communication terminal 10 accesses a data call using a data priority FA managed by the macro base station 100 and then performs a data service. It is provided (S512).

According to an embodiment of the present invention, since the frequency bands of the data-first FA used by the femto cell 2000 and the macro cell 1000 are the same, the mobile communication terminal 10 can perform a handover without performing a frequency transition process. It can increase the success rate of the over.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. For example, those skilled in the art can change the material, size, etc. of each component according to the application field, or combine or replace the disclosed embodiments in a form that is not clearly disclosed in the embodiments of the present invention, but this also It does not depart from the scope of the invention. Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, and that these modified embodiments are included in the technical idea described in the claims of the present invention.

10: mobile communication terminal
100: macro base station 200: femto cell base station
1000: macro cell 2000: femto cell

Claims (5)

A call processing system in a wireless network consisting of a macro cell having at least one femto cell, the call processing system comprising:
A macro base station dividing a frequency band of the macro cell into at least two frequency domains and using the data FA as a data FA for processing a data call using at least one or more of the divided frequency domains;
And a femto cell base station for processing a data call generated in the femto cell using a data FA for a femto cell having the same frequency domain as the data FA of the macro base station.
Call Processing System in a Wireless Network.
The method of claim 1,
A voice call generated in a mobile communication terminal in the femto cell is processed in a frequency domain except for the data FA.
Call Processing System in a Wireless Network.
The method of claim 1,
The macro base station connects a data call of the mobile communication terminal using the data FA when the mobile communication terminal to which the data call is connected through the data FA for the femto cell is handed over to the macro cell.
Call Processing System in a Wireless Network.
A call processing method in a wireless network system consisting of a macro cell having at least one femto cell,
Dividing a frequency band managed by the macro cell into at least two frequency bands, and using at least one or more of the divided frequency bands as a data FA for processing a data call;
Processing a voice call by using a frequency band other than the data FA when there is a voice call request of a mobile communication terminal in the femto cell area;
If there is a data call request of the mobile communication terminal in the femto cell area, using the femto cell data FA having the same frequency band as that of the data FA;
Call processing method in wireless network.
The method of claim 4, wherein
When the mobile communication terminal connected to the data call in the femto cell is handed over to the macro cell to process the data call of the mobile communication terminal using the data FA
Call processing method in wireless network.

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