KR101732157B1 - Apparatus and method for sniff in home femto-cell - Google Patents

Abstract

The sniff device sets an item to be obtained as a frequency band and a sniff result in order to sniff a signal having a different frequency band transmitted from one or more base stations and then transmits the signal transmitted from one or more base stations based on the set frequency band and the item . If it is confirmed that the sniffed result is obtained and the result is obtained, the service bandwidth is set and the service is executed with the set service bandwidth.

Description

[0001] Apparatus and method for sniffing in home femtocell [

The present invention relates to a sniffing apparatus and method in a home femtocell.

A home femtocell formed in an environment providing an LTE (Long Term Evolution) service, that is, a home base station, has a sniff function in a home base station for SON (Self Organizing Network) operation. The sniff function is used to detect equipment that transmits and receives signals around the home base station, and is used to detect signals such as macros, femtos, etc. in the home base station.

For the sniff, enter the information about the center frequency to sniff, the bandwidth and sniff of the sniffed devices (eg, RSRP, RSSI, RSRQ). In this case, when the devices to be sniffed use different frequency bandwidths, the home base station has to reboot each time at a different frequency band to sniff the signal, so that the system reboot time is long.

That is, it is assumed that a base station providing a service using a 10 MHz frequency band and a base station providing a service using a 20 MHz frequency band are mixed around the home base station. In this case, when the home base station sets the 10 MHz frequency band and sniffs the signal, the base station using the 20 MHz frequency band is not detected. Therefore, a base station using a 10 MHz frequency band is detected by setting the frequency band to 10 MHz. Also, the residential base station system is set to the 20 MHz frequency band through the reboot procedure, and it is troublesome to detect the base stations providing the service in the 20 MHz frequency band again.

Accordingly, the present invention provides a sniff device and method in a home femtocell.

According to another aspect of the present invention, there is provided a method of sniffing a signal in a home femtocell in which one or more base stations performing service in different frequency bands are mixed,

Setting an item to be obtained as a frequency band and a sniff result in order to sniff a signal having a different frequency band from the one or more base stations; Sniffing a signal transmitted from the one or more base stations based on the set frequency band and the item; Confirming that the sniffed result is obtained, and setting a service bandwidth when the result is obtained; And executing the service with the set service bandwidth.

Wherein the step of setting an item to be obtained as a result of the frequency band and the sniff comprises the steps of: setting a frequency band of a signal including a predetermined number of resource blocks for each of the transmitted signals as a frequency band to be sniffed; And setting result information obtained by sniffing each of the signals as an item.

The frequency band to be sniffed may correspond to a center frequency at which MIB (Master Information Blok) and SIB (System Information Block) can be obtained.

The result information may include Reference Signal Received Power (RSRP), Received Signal Strength Indicator (RSSI), and Reference Signal Received Quality (RSRQ).

Wherein the setting of the service bandwidth comprises: sniffing the signal to verify that the result is obtained; Increasing the count if the set item is not obtained as a result; Confirming whether the incremented count exceeds a predetermined value; And setting the base station including the sniff device to provide a service with a preset bandwidth if the increased count exceeds the predetermined value.

The step of executing the service may include the steps of acquiring the opening information from the sniffed result

. ≪ / RTI >

According to another aspect of the present invention, there is provided a home femtocell sniff device including one or more base stations for performing service in different frequency bands,

Comprising the steps of: sniffing a signal of a frequency band including a predetermined number of resource blocks among signals of different frequency bands transmitted from the one or more base stations, A sniff mode processing unit for determining a service bandwidth to be served; And a base station mode processor for transmitting / receiving signals to / from any one of the one or more base stations based on a service bandwidth determined by the sniff mode processing unit.

Wherein the sniff mode processing unit comprises: a bandwidth setting unit configured to set a bandwidth to sniff signals of different frequency bands transmitted from the one or more base stations; A sniff item setting unit for sniffing the signal and setting result information to be acquired; Based on a bandwidth set by the bandwidth setting unit, a signal transmitted from the one or more base stations, and confirms whether or not a result of sniffing is obtained to determine a frequency bandwidth to be used by the base station including the sniff device ; And a service band setting unit for providing a service in cooperation with any one of the one or more base stations or terminals based on the frequency bandwidth determined by the signal processing unit.

The signal processing unit may increase the count if the sniffed result is not obtained, check whether the increased count exceeds a preset value, and sniff the signal transmitted from the one or more base stations, You can decide to use it for service provision with a certain frequency bandwidth.

According to the present invention, since the narrow band signal is sniffed to obtain only the information necessary for the SON operation setting irrespective of the frequency bandwidth used by the devices around the home femtocell, the sniffing time and the number of performances can be shortened.

1 is a structural diagram of a home base station according to an embodiment of the present invention.
2 is a structural view of a sniff processing unit according to an embodiment of the present invention.
3 is a flowchart illustrating a sniff method according to an embodiment of the present invention.
4 is an exemplary view showing a sniff section according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

In this specification, a terminal includes a mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS) An access terminal (AT), and the like, and may include all or some of functions of a mobile terminal, a subscriber station, a mobile subscriber station, a user equipment, and the like.

In this specification, a base station (BS) is an access point (AP), a radio access station (RAS), a node B, a base transceiver station (BTS) Mobile Multihop Relay) -BS, and may include all or some of the functions of an access point, a radio access station, a Node B, a base transceiver station, and an MMR-BS.

Hereinafter, a sniff device and method in a home femtocell according to an embodiment of the present invention will be described with reference to the drawings. In an embodiment of the present invention, a home femtocell is referred to as a 'base station' for convenience of explanation.

1 is a structural diagram of a home base station according to an embodiment of the present invention.

1, the base station 100 includes a switch 110, a first amplifier 120, a divider 130, a second amplifier 140, a transceiver 150, a PHY / MAC processing ratio 160, And a sniff processing unit 170.

The duplexer 110 allows one antenna installed in the base station 100 to be used in common without interfering with a transmission signal or a reception signal having a different frequency band. The function of the switch 110 is already known, and a detailed description thereof will be omitted in the embodiment of the present invention.

The first amplifier 120 amplifies the received radio signal when receiving the radio signal transmitted from the base station 100 and other base stations adjacent to the base station 100 via the switch 110. The function of the first amplifier 120 is already known, and a detailed description thereof will be omitted in the embodiment of the present invention.

The divider 130 separates a signal transmitted from another adjacent base station and a signal transmitted from the base station 100 to another base station. Signals transmitted by other neighboring base stations are used for sniffing.

The second amplifier 140 amplifies a signal transmitted from another adjacent base station among the signals separated by the divider 130.

The transceiver 150 controls the signal receiving function not to be operated while the signal transmitter and the receiver are combined and transmits the signal to the other base station or the terminal while the signal is received from another adjacent base station So that it does not operate. The function of the transceiver 150 is already known, and a detailed description thereof will be omitted in the embodiment of the present invention.

The PHY / MAC processing unit 160 converts a radio signal transmitted from another adjacent base station into a digital signal, processes a signal in the MAC layer, or performs a signal processing function such as modulation / demodulation performed in the physical layer. The function of the PHY / MAC processing unit 160 is already known, and a detailed description thereof will be omitted in the embodiment of the present invention.

The sniff processing unit 170 is amplified by the second amplifier 140, sniffs a signal converted into a digital signal by the PHY / MAC processing unit 160, and determines an adjacent base station to which the base station 100 transmits / receives an actual signal And the like. When the sniff processing unit 170 sniffs a signal that has been digitally converted, the entire frequency band is not sniffed but sniffs only the preset bandwidth, which will be described together with the structure diagram of Fig.

2 is a structural view of a sniff processing unit according to an embodiment of the present invention.

2, the sniff processing unit 170 includes a base station mode processing unit 171 for performing communication with an adjacent base station, and a sniffing and sniffing result signal for communication with an adjacent base station, To the mode processing unit 171. The mode- The sniff mode processing unit includes a bandwidth setting unit 172, a sniff item setting unit 173, a signal processing unit 174, and a service band setting unit 175.

Based on the sniff result transmitted from the sniff mode processing unit, the base station mode processing unit 171 sets information to operate as a base station based on the sniff result transmitted from the sniff mode processing unit. Based on the set information, it transmits and receives signals to and from adjacent base stations. The base station function of the base station mode processing unit 171 is already known, and a detailed description thereof will be omitted in the embodiment of the present invention.

The bandwidth setting unit 172 sets a bandwidth for sniffing signals transmitted from neighboring base stations. In the embodiment of the present invention, the signal transmitted from the adjacent base stations is not entirely sniffed, but only the signal of the center frequency for the six resource blocks is sniffed. Here, the center frequency is a frequency bandwidth in which MIBs and SIBs are transmitted in common regardless of different bandwidths used by the neighboring base stations, and RSRP, RSSI, and SIB are transmitted through MIB (Master Information Block) RSRQ can be learned.

It is assumed that a first base station providing a service in a 10 MHz frequency band and a second base station providing a service in a 20 MHz frequency band are scattered around the base station 100. In this case, the first base station uses 50 resource block resources and the second base station uses 100 resource block resources.

If it is set to sniff the frequency at which 50 resource block resources are transmitted, 100 resource block resources can not decode the transmitted frequency. On the other hand, when setting the frequency at which the 100 resource block resources are transmitted to be sniffed, there is a disadvantage that the sniffing time is long. Therefore, in the embodiment of the present invention, approximately 6 resource block resources are commonly used at the center frequencies of two base stations. Therefore, in the embodiment of the present invention, for example, the center frequency at which six resource block resources are transmitted is sniffed .

The sniff item setting unit 173 inputs the result information to be acquired through the sniff. In the embodiment of the present invention, the center frequency is sniffed, and the signal transmitted from the adjacent base station is referred to as RSRP (Reference Signal Received Power) indicating the actually received reference signal power value, (Received Signal Strength Indicator) capable of receiving a value and RSRQ (Reference Signal Received Quality) information calculated by RSRP and RSSI will be described as an example.

The signal processing unit 174 sniffs only the band set by the bandwidth setting unit 172 and outputs the sniffed item setting result as a sniff result to the signal converted into the digital signal by the signal processing through the PHY / MAC processor 160 And obtains the RSRP, RSSI, and RSRQ set by the unit 173. Based on the acquired information, a base station to which signals are to be transmitted and received is selected among the at least one adjacent base stations, and it is determined to set the bandwidth to be used by the base station.

Further, when the signal processing unit 174 fails to obtain the sniffed result, the signal processing unit 174 increases the count by one. At this time, the speed can be increased up to a preset value. Further, the signal processing unit 174 acquires the opening information from the sniffed result when the bandwidth is set.

Herein, the start information includes the sniffed result information and information necessary for opening the base station to the adjacent base station. The sniffed result information includes RSRP, RSRQ, RSSI, cell ID of the base station transmitting the sniffed signal, TAC (Tracking Area Code), PCI (Physical Cell ID) do. Elements included in each information are already known for opening a communication service, and detailed description will be omitted in embodiments of the present invention.

The service band setting unit 175 sets a service band to be used by the base station 100 according to the bandwidth determined by the signal processing unit 174. [ And transmits the set service band information to the base station mode processing unit 171 so that the base station 100 requests the base station 100 to transmit / receive a signal to / from a neighboring base station or a terminal.

A method of sniffing a signal by the sniff processing unit 170 will be described with reference to Fig.

3 is a flowchart illustrating a sniff method according to an embodiment of the present invention.

3, the bandwidth setting unit 172 sets a band of a signal to be sniffed by the user (S100), and the sniff item setting unit 173 sets a signal input by the user An item about the result to be napped is set (S101). In the embodiment of the present invention, the band of the signal to be sniffed is set as sniffing the center frequency portion where the six resource blocks are transmitted, and as a result obtained by sniffing, RSRP, RSSI and RSRQ are obtained , But it is not necessarily limited thereto.

This will be described first with reference to FIG. 4, for example.

4 is an exemplary view showing a sniff section according to an embodiment of the present invention.

As shown in FIG. 4, only the signal of the center frequency part in which the MIB (Master Information Block) and the SIB (System Information Block), which are shaded, are transmitted is sniffed . A band that provides information obtainable through the sniff is included in the signal of the center frequency portion. Therefore, if only the center frequency part subjected to the shading processing is sniffed without having to sniff the entire signal, both RSRP, RSSI, and RSRQ can be obtained.

On the other hand, when the base station 100 completes preparation for sniffing a signal through steps S100 and S101 of FIG. 3, a signal transmitted from the base stations adjacent to the base station 100 is received (S102). At this time, adjacent base stations are in a state where the first base station and the second base station are mixed, and the base station 100 sniffs a signal to determine which base station 100 is to transmit / receive a signal in cooperation with which base station.

The signal processing unit 174 sniffs the signal received in step S102 to the items set in steps S100 and S101, and determines whether the RSRP, the RSSI, and the RSRQ are obtained as a result of the sniffing (S103). This may result in the sniffing of the signal but not the sniffed result.

Therefore, the signal processor 174 confirms that the sniffed result is obtained, and if the sniffed result is obtained, the base station 100 sets the bandwidth to be served by the base station 100 in cooperation with the neighbor base station based on the acquired result (S104) . In order to set a bandwidth to be serviced, a signal obtained by obtaining a result value indicating a value close to a preset reference in a plurality of obtained sniffed results is checked, and the bandwidth used by the base station, (100).

For example, if it is determined that a plurality of neighboring base stations interwork with a base station serving a bandwidth of 10 MHz, the signal processing unit 174 determines that the base station 100 uses 10 MHz for the bandwidth to be used by the base station 100. The base station 100 determines that the base station 100 uses a bandwidth of 20 MHz and the base station 100 determines to use the bandwidth of 20 MHz to use the bandwidth.

The base station mode processing unit 171 prepares to operate in the base station mode based on the service bandwidth set in step S104 (S105). As a result of the sniffing, the base station acquires the connection information with the neighboring base station (S106), and starts the service with the adjacent base station and the terminal based on the acquired information (S107).

On the other hand, if it is determined in step S103 that the result of the sniff item set in step S101 is not obtained after the sniffing of an arbitrary signal, the signal processor 174 increments the count by one (S108). Then, it is confirmed whether the increased count exceeds a predetermined value (S109). In the embodiment of the present invention, it is assumed that the predetermined value is " 3 ", so that if the result can not be obtained after the sniffing, the sniff is performed a predetermined number of times to obtain the result.

If the predetermined number is not exceeded, the signal processing unit 174 performs the procedure after step S102. However, if the count exceeds the preset number of times, the signal processing unit 174 sets the base station 100 to transmit / receive a signal to the bandwidth set in the initial base station 100 (S110). The predetermined bandwidth may be different depending on the base station 100, and thus is not limited to any one band. Then, the procedure after step S105 is performed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (10)

1. A method for sniffing a signal in a home femtocell in which one or more base stations, in which a sniff device performs service in different frequency bands,
Setting an item to be obtained as a result of a sniff and a frequency band that is a center frequency in each of the different frequency bands in order to sniff a signal having a different frequency band from the one or more base stations;
Receiving and sniffing a signal having a different frequency band from the one or more base stations based on the set frequency band and the item;
Confirming that the sniffed result is obtained, and setting a service bandwidth when the result is obtained; And
Executing the service with the set service bandwidth
≪ / RTI > The method according to claim 1,
Wherein the step of setting an item to be obtained as a result of the frequency band and the sniff comprises:
Setting a frequency band of a signal including a predetermined number of resource blocks for each of the transmitted signals as a frequency band to be sniffed; And
Setting the result information obtained by sniffing each of the signals as an item
≪ / RTI > 3. The method of claim 2,
Wherein the center frequency which is the frequency band to be sniffed corresponds to a frequency at which a MIB (Master Information Blok) and an SIB (System Information Block) can be obtained. 3. The method of claim 2,
Wherein the result information includes a reference signal received power (RSRP), a received signal strength indicator (RSSI), and a reference signal received quality (RSRQ). The method according to claim 1,
Wherein the setting of the service bandwidth comprises:
Sniffing the signal to verify that the result is obtained;
Increasing the count if the set item is not obtained as a result;
Confirming whether the incremented count exceeds a predetermined value; And
Setting the base station including the sniff device to provide a service with a preset bandwidth if the increased count exceeds the preset number
≪ / RTI > The method according to claim 1,
The step of executing the service comprises:
Obtaining the opening information from the sniffed result
≪ / RTI > 1. A sniff device in a home femtocell in which one or more base stations performing services in different frequency bands are mixed,
A predetermined number of resource blocks among signals of different frequency bands transmitted from the one or more base stations are included and a signal of a center frequency band which is a frequency band capable of obtaining MIB and SIB is sniffed, A sniff mode processing unit for determining a service bandwidth to be served by a base station including the sniff device based on a result of the sniff mode; And
And a base station mode processing unit for transmitting / receiving signals to / from any one of the one or more base stations based on a service bandwidth determined by the sniff mode processing unit
. 8. The method of claim 7,
The sniff mode processing unit,
A bandwidth setting unit configured to set a bandwidth to sniff signals of different frequency bands transmitted from the one or more base stations;
A sniff item setting unit for sniffing the signal and setting result information to be acquired;
Based on a bandwidth set by the bandwidth setting unit, a signal transmitted from the one or more base stations, and confirms whether or not a result of sniffing is obtained to determine a frequency bandwidth to be used by a base station including the sniff device for providing a service ; And
A service band setting unit for providing a service in cooperation with any one of the one or more base stations or terminals based on the frequency bandwidth determined by the signal processing unit;
The sneezing device 9. The method of claim 8,
The signal processing unit,
If the sniffed result is not obtained, the count is increased and the incremented count is checked to see if it exceeds a predetermined value, and the signal transmitted from the one or more base stations is sniffed or the service A sniff device for deciding what to use for delivery. 10. The method of claim 9,
Wherein the sniffed result includes RSRP, RSSI, and RSRQ.

Images