KR20110093686A - Method for controlling transmitting power of control channel of csg pico base station - Google Patents

Method for controlling transmitting power of control channel of csg pico base station Download PDF

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Publication number
KR20110093686A
KR20110093686A KR1020110011769A KR20110011769A KR20110093686A KR 20110093686 A KR20110093686 A KR 20110093686A KR 1020110011769 A KR1020110011769 A KR 1020110011769A KR 20110011769 A KR20110011769 A KR 20110011769A KR 20110093686 A KR20110093686 A KR 20110093686A
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KR
South Korea
Prior art keywords
base station
pico base
macro
macro terminal
terminal
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KR1020110011769A
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Korean (ko)
Inventor
김동희
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한국전자통신연구원
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Priority to US13/024,746 priority Critical patent/US20110194513A1/en
Publication of KR20110093686A publication Critical patent/KR20110093686A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/283—Power depending on the position of the mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/06—Reselecting a communication resource in the serving access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A method of controlling the transmit power of a control channel transmitted from a pico base station is disclosed. The pico base station may control the transmission power of the control channel according to the position of the macro terminal adjacent to the pico base station. If the macro terminal is located within the coverage of the pico base station, the pico base station can reduce the transmit power of the control channel so that the macro terminal can receive the control signal from the macro base station without the influence of interference.

Description

Control channel power control method of closed Pico base station {METHOD FOR CONTROLLING TRANSMITTING POWER OF CONTROL CHANNEL OF CSG PICO BASE STATION}

The following embodiments relate to a control channel power control technique of a pico base station, and more particularly, to a technique of controlling control channel power of a pico base station based on a location of a macro terminal.

A network in which a macro base station and a pico base station use the same frequency resource is called a heterogeneous network. In such a network, there is interference between a macrocell including a macro base station and a picocell including a pico base station.

Interference in the data channel can be controlled using interference avoidance techniques such as Inter-Cell Interference Canceling (ICIC). However, it is very difficult to control interference in a control channel transmitted using the same frequency and the same time interval.

On the other hand, a pico base station to which all terminals are accessible, such as an Open Pico Base Station (OSG), may allow handover of the macro terminal when the macro terminal connected to the macro base station approaches. Therefore, the problem of interference of the control channel is not serious.

However, a pico base station to which only a specific terminal is connected, such as a closed pico base station (CSG), does not allow handover of the macro terminal even when the macro terminal connected to the macro base station approaches.

Therefore, the macro terminal must transmit data to the macro base station even within the coverage of the pico base station. Within the coverage of the pico base station, since the macro terminal can receive a very strong interference signal from the pico base station, the communication quality is degraded.

One side of exemplary embodiments provides a technique by which a macro terminal can maintain a connection with a macro base station even near a pico base station.

Another side of the exemplary embodiments provides a method and apparatus that can reduce the effects of interference in the vicinity of a pico base station.

According to one side of the exemplary embodiment, determining whether the macro terminal connected to the macro base station is located within the coverage of the pico base station and controlling the transmission power of the control channel transmitted in at least one frequency band according to the determination Provided is a method for controlling power of a pico base station comprising a step.

According to yet another aspect of an exemplary embodiment, a method of operating a macro terminal, the method comprising: generating signal quality information of a reference signal received from a pico base station, transmitting the signal quality information to a macro base station, and the signal quality The information is used to determine whether the macro terminal is located within the coverage of the pico base station, and when the macro terminal is located within the coverage of the pico base station, at least one of a plurality of frequency bands allocated to the pico base station There is provided a method of operating a macro terminal, the method including receiving an interference signal having a reduced strength with respect to the above frequency band.

According to another aspect of the exemplary embodiment, the step of receiving the signal quality of the reference signal received from the pico base station by the macro terminal from the macro terminal, the macro terminal is based on the signal quality of the reference signal of the pico base station And determining whether the mobile station is located within coverage, wherein the macro terminal is configured to receive an interference signal whose strength is reduced for at least one or more frequency bands from the plurality of frequency bands allocated to the pico base station according to the determination. A method of operating a macro base station for receiving is provided.

According to one side of the exemplary embodiments, the macro terminal may maintain a connection with the macro base station even near the pico base station.

According to another side of the exemplary embodiments can reduce the effect of interference in the vicinity of the pico base station.

1 is a diagram illustrating an operation of a macro base station and a pico base station according to one side of an exemplary embodiment.
Fig. 2 is a flow chart illustrating step by step a control channel power control method according to another exemplary embodiment.
Fig. 3 is a flow chart illustrating step by step a control channel power control method according to another exemplary embodiment.
Fig. 4 is a flow chart illustrating step by step a method of operating a pico base station according to another exemplary embodiment.
Fig. 5 is a flowchart illustrating a specific method for determining whether a macro terminal is located within the coverage of a pico base station according to another exemplary embodiment.
Fig. 6 is a flowchart illustrating a step-by-step method of operating a macro terminal according to another exemplary embodiment.
Fig. 7 is a flowchart illustrating a step-by-step method of operating a macro terminal according to another exemplary embodiment.
Fig. 8 is a flowchart illustrating a step-by-step method of operating a macro base station according to another exemplary embodiment.

1 is a diagram illustrating an operation of a macro base station and a pico base station according to one side of an exemplary embodiment.

The pico base station 130 is a base station that transmits data using some or all of the frequencies allocated to the macro base station 110 within the coverage of the macro base station 110. According to one side, the coverage 140 of the pico base station 130 may be included in the coverage 120 of the macro base station 110.

The macro base station 110 and the pico base station 130 use the same frequency band. For the following description, it is assumed that the macro base station 110 and the pico base station 130 use the same frequency band f1 and f2. According to one side, the macro base station 110 and the pico base station 130 may transmit a control channel using both frequency bands f1 and f2. According to one side, the primary frequency band of the macro base station 110 may be f1, the secondary frequency band of the macro base station 110 may be f2. The macro base station 110 and the macro terminal 150 may transmit data using f1 or f2. In this case, the primary frequency band of the pico base station 130 may be f2, and the secondary frequency band of the pico base station 130 may be f1. The pico base station 130 may transmit data to the pico terminal connected to the pico base station using f1 or f2.

According to one side, the macro base station 110 may allocate a lower power than the control channel transmitted in the frequency band transmitted in the primary frequency band for the control channel transmitted in the secondary frequency band.

According to another aspect, the pico base station 130 may not transmit the control channel at all by allocating a transmission power of '0' to the control channel transmitted in the secondary frequency band.

In this case, the macro terminal 150 connected to the macro base station 110 may receive a control channel from the macro base station 110 using f1, which is the primary frequency band of the macro base station 110. Also, in this case, the pico base station 130 may not transmit a control channel at all for f1 which is the secondary frequency band of the pico base station 130.

Even when the macro terminal 160 is located within the coverage 140 of the pico base station 130, if the macro terminal 160 uses only the frequency band f1, the macro terminal 160 receives an interference signal from the pico base station 130. You can't. Therefore, the macro terminal 160 may communicate with the macro base station without interference of the control channel.

According to one side, the pico base station 130 may transmit a control channel using both the primary frequency band f2 of the pico base station 130 and the secondary frequency band f1 of the pico base station 130. If it is determined that the macro terminal 160 is located within the coverage of the pico base station, the pico base station 130 transmits a control channel using only the primary frequency band f2 of the pico base station 130, and the pico base station 130 The control channel may not be transmitted using f1, the secondary frequency band of.

Fig. 2 is a flow chart illustrating step by step a control channel power control method according to another exemplary embodiment.

In step 240, the pico base station 240 transmits a reference signal to the macro terminal 220. According to one side, a pilot signal, etc. that the macro terminal 220 already knows the pattern may be used as the reference signal.

In step 241 the macro terminal generates a signal quality for the received reference signal. According to one side, the macro terminal 220 may generate a reference signal received power (RSRP) of the reference signal or a signal-to-noise ratio (SNR) of the reference signal as signal quality.

In step 242, the macro terminal 220 transmits the signal quality to the macro base station 210.

In step 250, the macro base station 210 determines whether the macro terminal 220 is located within the coverage of the pico base station 230. According to one side, the macro base station 210 may determine whether the macro terminal 220 is located within the coverage of the pico base station 230 based on the signal quality received from the macro terminal 220.

According to one side, the macro base station 210 may compare the signal quality with a predetermined threshold. If the macro terminal 220 is located within the coverage of the pico base station 230, the macro terminal 220 may receive a strong interference signal from the pico base station 230, in this case, the macro terminal 220 is a pico base station The strength of the reference signal received from 230 may be higher than a predetermined threshold. Alternatively, the signal-to-noise ratio of the reference signal received by the macro terminal 220 from the pico base station 230 may be higher than a predetermined threshold.

According to one side, when the signal quality received from the macro terminal 220 is higher than the predetermined threshold, the macro base station 210 determines that the macro terminal 220 is located within the coverage of the pico base station 230 and The macro terminal 220 may generate information about whether the macro terminal 220 is located within the coverage of the pico base station 230.

In step 251, the macro base station 210 transmits information about whether the macro terminal 220 is located within the coverage of the pico base station 230 to the pico base station 230. According to one side, the macro base station 210 and the pico base station 230 may be connected using the S1 or X2 interface. In this case, the macro base station 210 may transmit information about whether the macro terminal 220 is located within the coverage of the pico base station 230 to the pico base station 230 using the S1 interface or the X2 interface. The pico base station 230 may determine that the macro terminal 220 is located within the coverage of the pico base station 230 based on information on whether the macro terminal 220 is located within the coverage of the pico base station 230. .

In step 260, the pico base station 230 is handed over to the primary frequency band f2 of the pico base station 230 for pico terminals connected to the pico base station 230 using the secondary frequency band f1 of the pico base station 230. To control. When the handover is completed, all pico terminals connected to the pico base station 230 are connected to the pico base station 230 using the primary frequency band f2 of the pico base station 230.

In step 270 the pico base station 230 reduces the transmit power for the secondary frequency band f1 of the pico base station 230. According to one side, the pico base station 230 may control the control channel is not transmitted at all by controlling the transmission power of the control channel to '0'.

In operation 280, the macro terminal 220 receives a control channel from the macro base station 210 using f1, which is a primary frequency band of the macro base station 210. Since the strength of the control channel transmitted by the pico base station 230 using f1 is very small or '0', the macro terminal 220 receives the control channel of the reduced strength from the pico base station 230. That is, the strength of the interference signal received from the pico base station 230 is reduced.

Fig. 3 is a flow chart illustrating step by step a control channel power control method according to another exemplary embodiment.

Steps 340 to 350 are similar to steps 240 to 250 of FIG. 2, and thus detailed descriptions thereof will be omitted.

If it is determined in step 350 that the macro terminal 320 is located within the coverage of the pico base station 330, the macro base station transmits a random access command to the macro terminal 320 in step 360.

In step 361, the macro terminal 320 transmits a random access preamble to the pico base station 361. According to one side, the random access command may include information on the random access preamble to be transmitted by the macro terminal 320. According to one side, the random access preamble transmitted by the macro terminal 320 is any of the random access preambles assigned to the macro base station 310, the allocated to the macro terminal 320 located within the coverage of the pico base station 330 It may be a connection preamble. In this case, the pico base station 330 may determine that the macro terminal 320 is located within the coverage of the pico base station 330 based on the random access preamble received from the macro terminal 320.

Since steps 370 to 390 are similar to steps 260 to 280 in FIG. 2, a detailed description thereof will be omitted.

Fig. 4 is a flow chart illustrating step by step a method of operating a pico base station according to another exemplary embodiment.

In step 410, the pico base station connects with the first pico terminal using the first frequency band. Here, the first frequency band may be the secondary frequency band of the pico base station. The first frequency band is a primary frequency band of the macro base station, and the macro terminal and the macro base station may be connected using the first frequency band.

In step 420, the pico base station connects with the second pico terminal using the second frequency band. Here, the second frequency band may be a primary frequency band of the pico base station.

In step 430, the pico base station determines whether the macro terminal is located within the coverage of the pico base station. A detailed determination method of whether the macro terminal is located within the coverage of the pico base station will be described in detail with reference to FIG. 5.

In step 440, the pico base station hands over the connected first pico terminal to the second frequency band using the first frequency band. If the first pico terminal hands over to the second frequency band, the pico base station does not need to transmit the control signal using the first frequency band.

In step 450 the pico base station reduces the transmit power of the control signal transmitted using the first frequency band. According to one side, the pico base station may control the transmission power of the control signal transmitted by using the first frequency band to '0'.

In step 450, the macro terminal is connected to the macro base station using a first frequency band which is a primary frequency band of the macro base station. Since the pico base station does not transmit a weak strength control signal or a control signal using the first frequency band, the macro terminal may receive the control signal from the macro base station without being affected by the interference signal.

In operation 450, the pico base station may transmit a control signal to the first pico terminal and the second pico terminal using a second frequency band which is a primary frequency band of the pico base station.

Fig. 5 is a flowchart illustrating a specific method for determining whether a macro terminal is located within coverage of a pico base station according to another exemplary embodiment.

FIG. 5A is a diagram for explaining a method of determining a location of a macro terminal based on information directly received by a pico base station from a macro base station. According to one side, the macro base station generates information on the position of the macro terminal based on the signal quality received from the macro terminal. According to one side, the macro base station and the pico base station may be directly connected using the S1 interface or X2 interface. The pico base station directly receives information on the location of the macro terminal from the macro base station, and may determine whether the macro terminal is located within the coverage of the pico base station based on the information on the location of the macro terminal.

FIG. 5B is a diagram for explaining a method of determining a position of a macro terminal by a pico base station based on a random access preamble received from the macro terminal. According to one side, the macro base station may determine the position of the macro terminal based on the signal quality received from the macro terminal.

If it is determined that the macro terminal is located within the coverage of the pico terminal, the macro base station may send a random access command to the macro terminal to the macro terminal.

The macro terminal may transmit the random access preamble to the pico base station according to the random access command. When the pico base station receives the random access preamble from the macro terminal, the pico base station may determine that the macro terminal is located within the coverage of the pico base station.

According to one side, the random access preamble transmitted by the macro terminal may be a preamble allocated to the macro terminal among the random access preambles that can be received by the pico base station. Therefore, if the pico base station receives the preamble assigned to the macro terminal, the pico base station may determine that the macro terminal is located within the coverage of the pico base station.

According to one side, the macro base station may transmit a random access command to the macro terminal using a handover indication message, an L1 / L2 indicator, or the like.

According to one side, the random access command includes information on the random access preamble to be transmitted by the macro terminal, the macro terminal may transmit the random access preamble with reference to the information on the random access preamble included in the random access command.

Fig. 6 is a flowchart illustrating a step-by-step method of operating a macro terminal according to another exemplary embodiment.

In step 610, the macro terminal receives a reference signal from the pico base station. According to one side, a pilot signal or the like that the macro terminal already knows the pattern may be used as the reference signal.

In step 620, the macro terminal generates the signal quality of the reference signal. According to one side, RSRP (Reference Signal Received Power) of the reference signal or Signal to Noise Ratio (SNR) of the reference signal may be generated as signal quality information.

In operation 620, the macro terminal transmits the signal quality of the generated reference signal to the macro base station. The macro base station may determine whether the macro terminal is located within the coverage of the pico base station based on the signal quality of the reference signal, and generate information on the position of the macro terminal.

According to one side, the macro base station and the pico base station may be directly connected using the S1 interface or X2 interface. The macro base station may directly transmit information on the location of the macro terminal to the pico base station.

In step 630, the pico base station may control the transmission power of the control channel based on the information on the position of the macro terminal. According to one side, the pico base station may reduce the transmission power of the control channel, or control the transmission power of the control channel to '0'.

The control channel that the macro terminal receives from the pico base station is an interference signal. Accordingly, the macro terminal may receive an interference signal of reduced strength from the pico base station.

According to one side, the pico base station may transmit a control channel using a plurality of frequency bands. In this case, the pico base station may select at least one or more frequency bands from among the plurality of frequency bands, and control the transmission power of the control channel transmitted using the selected frequency band. According to one side, the pico base station may control the transmission power of the control channel by selecting a frequency band to which the macro terminal and the macro base station is connected.

Fig. 7 is a flowchart illustrating a step-by-step method of operating a macro terminal according to another exemplary embodiment.

According to one side, the macro base station and the pico base station may not be directly connected using the S1 interface or the X2 interface.

In this case, the macro base station may determine whether the macro terminal is located within the coverage of the pico base station based on the signal quality of the reference signal and transmit a random access command to the macro base station to the macro terminal.

In step 710, the macro terminal receives a random access command for the pico base station.

In step 720, the macro terminal transmits the random access preamble to the pico base station according to the random access command. The pico base station may determine the location of the macro terminal based on the random access preamble.

According to one side, the pico base station determines that the macro terminal is located within the coverage of the pico base station based on the random access preamble, it is possible to reduce the power of the control channel transmitted to the macro terminal.

In step 630, the macro terminal may receive an interference signal of reduced strength from the pico base station.

Fig. 8 is a flowchart illustrating a step-by-step method of operating a macro base station according to another exemplary embodiment.

In step 810, the macro terminal generates a signal quality of the reference signal received from the pico base station, the macro base station receives the generated signal quality from the macro terminal.

According to one side, the macro base station may receive a reference signal received power (RSRP) of the reference signal or a signal to noise ratio (SNR) of the reference signal as the signal quality in the macro terminal.

In step 820, the macro base station determines whether the macro terminal is located within the coverage of the pico base station. According to one side, the macro base station may determine the position of the macro terminal by comparing the signal quality received from the macro terminal with a threshold.

According to one side, the signal quality may be the reception strength of the reference signal. In this case, the macro base station may compare the reception strength of the reference signal with a predetermined first threshold. If the reception strength of the reference signal is greater than the first threshold, the macro base station may determine that the macro terminal is located within the coverage of the pico base station.

According to another aspect, the signal quality may be a signal-to-noise ratio of the reference signal received by the macro terminal from the pico base station. In this case, the macro base station may compare the signal-to-noise ratio of the reference signal with a predetermined second threshold. If the signal-to-noise ratio of the reference signal is greater than the second threshold, the macro base station may determine that the macro terminal is located within the coverage of the pico base station.

According to one side, the macro base station and the pico base station may be directly connected using the S1 interface or X2 interface. If it is determined that the macro terminal is located within the coverage of the pico base station, the macro base station may directly transmit information about the position of the macro terminal to the pico base station.

According to another aspect, when it is determined in step 830 that the macro terminal is located within the coverage of the pico base station, the macro base station may transmit a random access command to the macro terminal to the macro terminal. The macro terminal may transmit the random access preamble to the pico base station according to the random access command. The pico base station may determine that the macro terminal is located within the coverage of the pico base station based on the random access preamble.

When the pico base station recognizes the position of the macro terminal, the pico base station may control the power of the control channel transmitted to the macro terminal. According to one side, the pico base station may transmit a control channel using a plurality of frequency bands. In this case, the pico base station may control the transmit power of the control channel transmitted in the frequency band in which the macro terminal is connected to the macro base station. According to one side, the pico base station may control the transmission power of the control channel to '0' to minimize the strength of the interference signal transmitted to the macro terminal.

According to one side, the pico base station may be connected to the pico terminals using a plurality of frequency bands. In this case, the pico base station determines a frequency band from which the macro terminal is connected to the macro base station among the plurality of frequency bands. The pico base station may instruct the connected pico terminals to handover to another frequency band using the frequency band. When the pico terminals handover, the pico base station may not transmit a control signal using the corresponding frequency band. Therefore, the pico base station may reduce the transmission power of the control channel transmitted in the corresponding frequency band, or control to '0'.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

110: macro base station
120: coverage of the macro base station
130: pico base station
140: coverage of the pico base station
150, 160: macro terminal

Claims (17)

Determining whether a macro terminal connected to the macro base station is located within the coverage of the pico base station; And
Controlling transmission power of a control channel transmitted in at least one frequency band according to the determination
Power control method of the pico base station comprising a. The method of claim 1,
Receiving information about whether the macro terminal is located within the coverage of the pico base station from the macro base station;
Further comprising:
The determining may include determining whether the macro terminal is located on the basis of information on whether the macro terminal is located within the coverage of the pico base station. The method of claim 2,
The information on whether the macro terminal is located within the coverage of the pico base station is generated based on the signal quality of the reference signal received by the macro terminal from the pico base station. The method of claim 3,
And a signal quality of the reference signal is a reference signal received power (RSRP) of the reference signal or a signal to noise ratio (SNR) of the reference signal. The method of claim 1,
The determining may include determining that the macro terminal is located within the coverage of the pico base station when the random access preamble is received from the macro terminal. The method of claim 5,
The macro terminal receives a random access command generated based on the signal quality of a reference signal received from the pico base station from the macro base station, and transmits the random access preamble according to the random access command. Power control method. The method of claim 5,
And the random access preamble is allocated to the macro terminal. The method of claim 1,
Connecting to a first pico terminal using a first frequency band and connecting to a second pico terminal using a second frequency band; And
Handover the first pico terminal connected to the second frequency band using the first frequency band according to the determination;
Further comprising:
The controlling of the transmit power may include reducing a transmit power of a control channel transmitted using the first frequency band. In the operating method of the macro terminal,
Generating signal quality information of a reference signal received from the pico base station;
Transmitting the signal quality information to a macro base station; And
The signal quality information is used to determine whether the macro terminal is located within the coverage of the pico base station, and when the macro terminal is located within the coverage of the pico base station, among the plurality of frequency bands allocated to the pico base station. Receiving an interference signal having a reduced strength for at least one or more frequency bands
Operation method of a macro terminal comprising a. 10. The method of claim 9,
And a signal quality of the reference signal is a reference signal received power (RSRP) of the reference signal or a signal to noise ratio (SNR) of the reference signal. 10. The method of claim 9,
If the macro terminal is located within the coverage of the pico base station,
Receiving a random access command from the macro base station; And
Transmitting a random access preamble to the pico base station according to the random access command;
Further comprising:
The receiving of the interference signal may include receiving the interference signal based on the random access preamble. 10. The method of claim 9,
If the macro terminal is located within the coverage of the pico base station,
And the pico base station receives information on the location of the macro terminal from the macro base station and reduces the strength of the interference signal based on the information on the location of the macro terminal. Receiving a signal quality of a reference signal received from the pico base station by the macro terminal from a macro terminal;
Determining whether the macro terminal is located within the coverage of the pico base station based on the signal quality of the reference signal
Including,
And wherein the macro terminal receives, from the pico base station, an interference signal whose strength is reduced for at least one or more frequency bands among the plurality of frequency bands allocated to the pico base station according to the determination. The method of claim 13,
The signal quality of the reference signal is a method of operating a macro base station which is a reference signal received power (RSRP) or a signal to noise ratio (SNR) of the reference signal. The method of claim 13,
The determining may include determining that the macro terminal is located within the coverage of the pico base station when the signal quality is greater than a predetermined threshold. The method of claim 13,
If the macro terminal is determined to be within the coverage of the pico base station, transmitting the determination result to the pico base station
Method of operation of a macro base station further comprising. The method of claim 13,
If it is determined that the macro terminal is within the coverage of the pico base station, transmitting a random access command to the macro terminal to the macro terminal.
Further comprising:
And the pico base station reduces the strength of the interference signal based on a random access preamble transmitted by the macro terminal to the pico base station according to the random access command.
KR1020110011769A 2010-02-10 2011-02-10 Method for controlling transmitting power of control channel of csg pico base station KR20110093686A (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2015152502A1 (en) * 2014-03-31 2015-10-08 인텔렉추얼디스커버리 주식회사 Wireless communication system and method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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US10805974B2 (en) 2014-03-31 2020-10-13 Intellectual Discovery Co., Ltd. Wireless communication system and method

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