KR101457536B1 - Method and apparatus for reducing interference caused by peer to peer communication in wireless communication system - Google Patents

Method and apparatus for reducing interference caused by peer to peer communication in wireless communication system Download PDF

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KR101457536B1
KR101457536B1 KR1020070085338A KR20070085338A KR101457536B1 KR 101457536 B1 KR101457536 B1 KR 101457536B1 KR 1020070085338 A KR1020070085338 A KR 1020070085338A KR 20070085338 A KR20070085338 A KR 20070085338A KR 101457536 B1 KR101457536 B1 KR 101457536B1
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South Korea
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terminal
p2p
mobile communication
code
transmission power
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KR1020070085338A
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Korean (ko)
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KR20090020769A (en
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이상민
권일원
정영호
김형명
안우근
김대현
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삼성전자주식회사
한국과학기술원
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Abstract

The present invention relates to a method and apparatus for reducing interference due to peer-to-peer communication in a mobile communication system, and in particular, to a method of operating a peer-to-peer (P2P) terminal for reducing interference due to peer- The method comprising the steps of: receiving, by the P2P terminal, an uplink signal transmitted to a base station by a mobile communication terminal; calculating a link gain between the P2P terminal and the mobile communication terminal based on the received uplink signal; And determining whether P2P communication with another P2P terminal is possible based on the gain, thereby reducing interference to the mobile communication terminal during P2P communication.
Peer to Peer (P2P), ranging code, link gain.

Description

TECHNICAL FIELD The present invention relates to a method and apparatus for reducing interference due to peer-to-peer communication in a mobile communication system,

The present invention relates to P2P (Peer TO Peer) communication in a mobile communication system, and more particularly, to a method and apparatus for confirming a radio environment of a mobile communication terminal adjacent to a P2P terminal and reducing interference received by a mobile communication terminal due to P2P communication will be.

In the current mobile communication system, a mobile station researches a technique of communicating peer-to-peer (P2P) communication using a frequency band similar to mobile communication without using another frequency band . Here, the direct communication between the terminals without relaying the base station is referred to as P2P communication.

1 shows an example of P2P communication in a mobile communication system.

1, terminals located in inner regions 104, 105, and 106 of a cell in a first cell region 101, a second cell region 102, and a third cell region are allocated radio resources For example, a frequency), and a terminal (hereinafter, referred to as a P2P terminal) that performs P2P service among the terminals located at a cell edge portion reuses the same radio resources (reuses the same frequency) to perform P2P communication. P2P terminals located at the edge of the cell are distant from the base station, so that even if performing P2P communication, they do not interfere with the base station. Therefore, terminals in the hatched area 100 can perform P2P communication at the same frequency.

Here, when a P2P transmission is performed using the same resource as a mobile communication resource, there is a method of using a reception power level of a preamble of a downlink as a method for determining whether P2P communication is possible. For example, if the received power is low based on the received power of the downlink preamble received from the base station, the P2P terminal may determine that it is located at the edge of the cell and attempt P2P transmission. If the UE to transmit P2P uses the uplink time / frequency resource in the frame, it obtains the link gain value between the base station and the P2P terminal by using the reception power of the DL preamble and the transmission power level of the base station, The interference to the mobile communication uplink terminal can be minimized by controlling the power not reaching the base station.

However, if resources of a downlink frame are used for P2P communication, it may cause a large interference to a terminal receiving a mobile communication downlink service. That is, even if the link state between the P2P terminal and the base station is poor, the link between the mobile communication terminal receiving the packet from the base station and the P2P terminal may be good. The above problem will be described in detail with reference to FIG.

2 is a diagram illustrating an interference problem of a neighboring terminal in P2P communication in a conventional mobile communication system.

Referring to FIG. 2, a P2P mobile station in a coverage area 207 where a first cell area 203 and a second cell area 205 overlap each other measures a preamble signal of a downlink of a base station, (200), and will attempt P2P communication. Assuming that a mobile communication terminal adjacent to the area 207 receives downlink packet data from the base station, if the link gain between the mobile communication terminal and the peer-to-peer terminal is large, the mobile communication terminal can receive interference from the peer- Therefore, there is a problem that the downlink packet is not successfully received.

As described above, a method and apparatus for reducing interference by not recognizing mobile communication terminals capable of receiving interference in a P2P communication and controlling P2P communication or controlling a transmission power level are proposed.

According to a first aspect of the present invention, there is provided a method of operating a mobile communication terminal for reducing interference due to peer-to-peer communication in a mobile communication system, the method comprising: determining a transmission power level; Level code, and transmitting the selected code through an uplink channel. The code is used to determine whether or not P2P communication with another P2P terminal with an adjacent P2P terminal is performed Is used.

According to a second aspect of the present invention, there is provided a method of operating a peer-to-peer (P2P) terminal for reducing interference due to peer-to-peer communication in a mobile communication system, The method includes the steps of: receiving a code for transmitting to a base station, the P2P terminal calculating a link gain between the P2P terminal and the mobile communication terminal based on the received code; Determining whether or not P2P communication of the mobile communication terminal is possible, and the code is a code corresponding to the transmission power of the mobile communication terminal.

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According to a third aspect of the present invention, there is provided a mobile communication terminal apparatus for reducing interference due to peer-to-peer communication in a mobile communication system, the apparatus comprising: a power level determiner for determining a transmission power level; A code mapping unit for selecting a code corresponding to a transmission power level, and a control unit for transmitting the selected code on an uplink channel, wherein the code is used for determining whether P2P communication with another P2P terminal is performed in an adjacent P2P terminal Is used.

According to a fourth aspect of the present invention, there is provided a peer to peer (P2P) terminal apparatus for reducing interference due to peer-to-peer communication in a mobile communication system, The P2P terminal calculates a link gain between the P2P terminal and the mobile communication terminal based on the received code, and performs P2P communication with another P2P terminal based on the link gain And a link gain estimating unit for determining whether or not the mobile communication terminal is capable of transmitting the mobile communication terminal, and the code is a code corresponding to the transmission power of the mobile communication terminal.

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As described above, by recognizing the mobile communication terminal to be subjected to interference before P2P communication and determining the P2P communication availability in consideration of the link status to some extent or more with the mobile communication terminal and adjusting the transmission power level, There is an advantage of reducing interference. Also, because it is easy to implement without additional time / frequency resources, it is easy to apply to existing mobile communication system environments. In the case where the mobile communication terminal itself generates and transmits a control message with a code corresponding to the transmission power level, the mobile communication terminal itself transmits the control message without performing the relay operation of the base station and using the resources of the uplink and the downlink, The communication terminal can be recognized.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 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 of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

Hereinafter, a method and apparatus for minimizing interference by determining whether P2P communication is possible by recognizing a neighboring mobile communication terminal in peer-to-peer communication in a mobile communication system or adjusting a transmission power level will be described.

FIG. 3 is a flowchart of a mobile communication terminal operation for minimizing interference due to P2P communication in the mobile communication system according to the first embodiment of the present invention. Here, it is assumed that a P2P terminal uses a CDMA signaling slot such as a ranging channel of a broadband wireless communication system (IEEE 802.16 d / e) system as shown in FIG. 8 to identify a neighboring terminal. The ranging code is a code for requesting a power level adjustment, a handover request, a resource request, and the like for assisting an initial terminal operation. A CDMA code is assigned to perform a contention based wireless connection in a time / frequency / code space .

Referring to FIG. 3, if the CDMA ranging is required in step 300, the mobile communication terminal proceeds to step 302 and determines a transmission power level size.

When a terminal receiving (or receiving) service from a mobile communication base station performs CDMA ranging (initial ranging, handover ranging, periodic ranging, and bandwidth request ranging), a transmission power level must first be determined. If an appropriate transmission power level is maintained through communication with the base station, the transmission power may be transmitted at a power corresponding to the transmission power level. If the initial ranging is attempted, the transmission level may be reduced to a minimum level permitted by the system.

In step 304, the mobile communication terminal selects a transmission code according to the transmission power level. In other words, when the transmission power level is determined, one of the codes corresponding to the code group corresponding to each transmission power level is selected and used as the ranging code.

Referring to FIG. 9, the N code groups have a mapping relationship with a transmission power level, respectively. That is, code group 1 is mapped to a transmit power level of 23 dBm, code group 2 is mapped to a transmit power level of 22 Bm, code group 3 is mapped to a transmit power level of 21 dBm, code group N is mapped to a transmit power level of 23 dBm, Lt; / RTI > Therefore, if the transmission power level is determined to be 21 dBm in step 302, in step 304, one of the codes corresponding to the code group 3 is selected in a predetermined rule or randomly. As shown in FIG. 9, it is assumed that a mapping rule of a transmission power level corresponding to a code group and a corresponding code group is shared by all mobile communication terminals and P2P terminals.

In step 306, the mobile communication terminal transmits a ranging code selected in the ranging message. That is, as shown in FIG. 8, the selected code transmits the selected code using the ranging channel of the front portion 808 of the uplink 802. [ The implementation of the ranging channel may vary depending on the system. At this time, the mobile communication base station receiving the ranging code can perform the ranging process with the mobile communication terminal. On the other hand, the P2P mobile station receiving the ranging code transmits the ranging code to the neighboring mobile communication terminal .

Here, since it is a matter of interest that the ranging code of the mobile communication terminal is successfully received by the receiver of the P2P terminal in the case of the P2P terminal, the ranging process of the mobile communication terminal that transmitted the ranging code and the mobile communication base station has been successfully performed The P2P terminal performs the operation of FIG. 4 as follows.

Thereafter, the algorithm of the present invention terminates.

4 is a flowchart illustrating an operation of a P2P mobile terminal for minimizing interference to a neighbor mobile communication terminal in the mobile communication system according to the first embodiment of the present invention.

Referring to FIG. 4, in step 400, the P2P terminal receives an uplink ranging code in a frame.

Then, in step 402, the P2P terminal measures the received power of the ranging code.

Then, the P2P terminal detects a ranging code that is successfully received in step 404. Here, when detecting the ranging code, an output value of a correlator can be used. A reference code used in the correlator starts to obtain a correlation value from a code corresponding to a maximum transmit power value usable by the UE do. It is intended to stop the code detection process when a terminal having a specific link gain or more is detected by using the code corresponding to high transmission power as a reference code. That is, once a link gain signal of a specific value or more is detected, the P2P terminal can not perform P2P transmission, so that no more code detection is required. This can reduce the burden on the terminal required for ranging code detection.

In a mobile communication system based on a repeater, when a code of a terminal is detected in a peer-to-peer (P2P) terminal, it is necessary to distinguish whether the terminal belonging to the mobile communication base station or the terminal to which the terminal belonging to the relay belongs. It is necessary to have a different ranging code set by assigning the ranging codes seed values of the ranging codes to different values.

Then, the P2P terminal refers to the ranging code detected in step 406 and estimates the level of the power used by the mobile communication terminal which transmitted the code obtained by the receiver, based on the mapping rule of the code group and the transmission power level according to the code group .

Then, the P2P terminal calculates a link gain between the mobile communication terminal and the P2P terminal that received the ranging code based on the estimated transmission power value of the terminal, which is estimated from the code received in step 408, using Equation (2) do.

Figure 112007061439015-pat00001

Here,

Figure 112007061439015-pat00002
Is the terminal index,
Figure 112007061439015-pat00003
The terminal
Figure 112007061439015-pat00004
Is the received power of
Figure 112007061439015-pat00005
The terminal
Figure 112007061439015-pat00006
Is the transmission power of
Figure 112007061439015-pat00007
Is a link gain including a distance between the base station and the terminal k, attenuation, shadowing, and the like.

Then, in step 410, the P2P terminal checks the status of the neighboring mobile communication terminal using the link gain information, and determines whether P2P communication is possible, and performs P2P communication. That is, when there is a terminal with a specific link gain value or more in a channel with its neighboring mobile communication terminal, the P2P transmission attempt is stopped, and the channel information is periodically updated, so that the neighboring terminal does not exist, It tries to transmit P2P after waiting until it becomes small.

Thereafter, the algorithm of the present invention terminates.

As described above with reference to FIG. 3 to FIG. 4, in order to operate the above-described embodiment, a mapping relation between the ranging code and the transmission power to be used must be established as shown in FIG. Also, in order for the P2P UE to efficiently learn the neighboring terminal while consuming a small amount of power, the transmission of the ranging code using the mapping rule with the ranging code-to-transmit power is not applied to all the uplink frames, Or a predetermined period of time such as several hundred milliseconds, and applies the same to a specific uplink frame, so that the P2P terminal can grasp the mobile communication terminal more efficiently. Here, the terminal at the edge of the cell does not perform the ranging only for a predetermined period, but performs the ranging access using the mapping relation between the ranging code given in a predetermined specific period and the used transmission power. By doing this, neighboring terminals can be grasped without affecting the ranging process defined in the existing system.

According to the implementation, when the mobile communication terminal desires to have a low SINR (Signal-to-Interference-plus-Noise Ratio) or a higher quality service, the mobile communication terminal transmits a control message to the P2P terminal in advance It is possible to prevent adjacent P2P terminals from transmitting packets. At this time, the mobile communication terminal directly transmits a control message using a code indicating its own transmission power level. A detailed description will be given in Fig. 5 below.

5 is a flowchart illustrating an operation of a mobile communication terminal for minimizing interference due to P2P communication in a mobile communication system according to a second embodiment of the present invention.

Referring to FIG. 5, if a higher quality of service is requested in step 500, the mobile communication terminal proceeds to step 502 and generates a code including required transmission power.

In step 504, the mobile communication terminal transmits the code on a reverse control channel.

In other words, in a mobile communication system, when a signaling cycle is defined in advance and a mobile communication terminal desiring a high quality service transmits a code corresponding to an uplink transmission power at a pre-transmission period. At this time, in the case of a P2P terminal having a packet to be transmitted, it is possible to update information of a neighboring terminal by checking whether there is a code to be transmitted through an uplink control channel for each signaling period.

Here, a Reverse Transmission Power Indication Channel (R-TPICH) can be defined.

If the control message including the R-TPICH is directly transmitted to the P2P UEs, additional time / frequency resources for transmitting the control message are required if there is a CDMA signal segment such as IEEE 802.20 MBTDD / MBFDD (The IEEE 802.20 MBTDD / MBFDD system defines a Walsh code with a length of 1024.) Instead, it is necessary to define the transmission level, which is meaningful for each code, using several of the CDMA codes.

Since the terminal participating in the R-TPICH transmission will participate only in some terminals located at the edge of the mobile communication service, interference with the uplink transmission may be minimized if the terminal transmits at a power level that does not affect the interference to the mobile communication uplink . Also, since the link gain does not change significantly with time, the number of times of control message transmission can be minimized.

Thereafter, the algorithm of the present invention terminates.

5 is a flowchart illustrating a P2P mobile communication terminal operation for minimizing interference due to P2P communication in the mobile communication system according to the second embodiment of the present invention. Is omitted.

In summary, when the transmitted code is successfully received by the P2P terminal, the transmission power level can be estimated from the code detected from the received signal, and the link gain information is obtained based on the estimated transmission power level information. The P2P terminals participate in the P2P transmission based on the information of the neighboring terminals by referring to the link gain information.

FIG. 6 is a flowchart illustrating a P2P mobile communication method for minimizing interference to a neighboring mobile communication terminal in a mobile communication system according to a third embodiment of the present invention. Here, the third embodiment is a method of directly obtaining the link gain from the received power by equalizing the transmission power when the cell edge mobile communication terminal transmits the control signal in the uplink. A mobile communication terminal that can receive interference by a P2P transmission can be regarded as a terminal having poor channel state with a base station. In order to avoid interference by the P2P transmission, such a terminal (the terminal having a received signal power or a SINR less than a certain level) transmits the same transmission power value to each uplink. Considering that the control signal of the mobile communication terminal must be capable of signal reception and restoration to the mobile communication base station in the uplink and that the mobile communication terminals which need to reduce the interference by the P2P transmission are adjacent to the edge of the cell It is assumed that the maximum transmission power of the terminal or a correspondingly high transmission power level is used.

Referring to FIG. 6, when the P2P terminal is located at the edge of the cell at step 600, the P2P terminal proceeds to step 602 and collects the same transmission power information of the terminal at the cell edge from the base station. The fixed transmission power may be provided from the base station, and a predetermined value may be defined and used.

In step 604, the P2P terminal measures the received power of the uplink control signal.

Then, in step 606, the P2P terminal collects link gain information using the same transmission power and received power measurement values. That is, the link gain can be calculated as a difference between the same transmission power level and the reception power level.

Then, in step 608, the P2P terminal refers to the link gain information to check whether P2P communication is possible.

Thereafter, the algorithm of the present invention terminates.

FIG. 7 is a flowchart illustrating a P2P mobile communication method for minimizing interference to a neighboring mobile communication terminal in a mobile communication system according to a fourth embodiment of the present invention.

If the P2P transmission is performed with a transmission power that does not reach the mobile communication base station by utilizing the size of the existing downlink preamble, transmission that does not affect the mobile communication terminal using the uplink slot is possible. However, when P2P transmission is to be performed in the mobile communication downlink slot, determining P2P transmission as the size of the DL preamble may cause a problem as shown in FIG. On the other hand, even if the size of the downlink preamble is large, even if the signal strength of the uplink terminals is small, the interference to the mobile communication terminal can be minimized even if the P2P transmission is performed in the mobile communication downlink slot. This is based on two facts of the communication system environment as follows. First, when a signal of a terminal transmitting on an uplink channel is received, if the received power of the signal is below a predetermined threshold, it can be determined that the distance between the P2P terminal and the mobile communication terminal using the uplink is sufficiently large . Also, since a mobile communication terminal receiving a signal through a downlink has a high possibility of transmitting a data packet (e.g., voice, video communication) or a control signal through an uplink corresponding to the downlink, It can be assumed that the mobile communication terminal is a terminal to receive data through the downlink. Based on the above two assumptions, based on the received power of the signal received from the terminal transmitting the uplink, the participation in the P2P transmission of the mobile communication downlink slot is determined, and the interference to the mobile communication downlink service terminal is determined Can be minimized.

Referring to FIG. 7, in step 700, the P2P terminal measures a signal strength of an uplink channel.

Then, the P2P terminal confirms whether the signal strength measured in step 702 is less than or equal to the threshold value, and proceeds to step 704 to perform P2P communication when it is equal to or smaller than the threshold value. If it is larger than the threshold value, the process proceeds to step 700.

11 is a diagram of a terminal apparatus for minimizing interference due to P2P communication in a mobile communication system according to an embodiment of the present invention.

11, the UE includes an RF processor 1100, an OFDM receiver 1102, a controller 1104, an OFDM transmitter 1106, an RF processor 1108, a received power measurement unit 1110, A code mapping unit 1114;

The RF processor 1100 converts an RF (Radio Frequency) signal received through an antenna into a baseband analog signal. The OFDM receiver 1102 converts the analog signal from the RF processor 1100 into sample data and outputs the sampled data. Then, the sample data is transformed into frequency domain data by Fast Fourier Transform (FFT), and data of subcarriers to be actually received are selected from the frequency domain data and output. The OFDM receiver 1102 demodulates and decodes data according to a predetermined modulation level (MCS level), and outputs the demodulated and decoded data to the controller 1104.

The control unit 1104 performs a process on the information provided from the OFDM receiver 1102 and provides the result to the OFDM transmitter 1106. In addition to the present invention, correlation is performed to detect a ranging code and provide it to the code mapping unit 1114. Also, the controller 1104 receives the link gain information from the link gain estimator 1112, and determines whether or not the P2P communication is performed to control the P2P communication.

If the control unit 1104 wants to actively notify the mobile communication terminal of a low SINR value or a high quality service of its own presence so as not to be interfered with by a P2P terminal, And signals a code containing its own transmission power level using information to be transmitted. The P2P terminal receiving this signal collects information of the neighboring terminals and refers to it when determining whether P2P transmission is possible.

The OFMD transmitter 1106 codes and modulates data from the controller 1104 according to a predetermined modulation level (MCS level). Then, the modulated data is subjected to Inverse Fast Fourier Transform (IFFT) to output sample data (OFDM symbol). Then, the sample data is converted into an analog signal and output to the RF processor 1108. The RF processor 1108 converts the analog signal into an RF (Radio Frequency) signal and transmits the signal through an antenna.

Here, the controller 1104 receives information necessary for performing a general mobile communication protocol process to a corresponding component of the physical layer or generates a control signal to a corresponding component of the physical layer. The controller 1104 may control the transmitter and the receiver in a TDD (Time Division Duplex) mode or an FDD (Frequency Division Duplex) mode. In addition, the controller 1104 receives information necessary for performing the processing of the inter-terminal P2P communication protocol to a corresponding component of the physical layer or generates a control signal to the corresponding component of the physical layer.

The received power measurement unit 1110 receives a signal of the uplink control channel from the OFDM receiver 1102, measures the received power, and provides measurement results to the link gain estimation unit 1112.

When performing the ranging by the controller 1104, the power level determining unit 1116 determines an appropriate transmission power level. If an appropriate transmission power level is maintained through communication with the base station, the power corresponding to the value is determined. If the initial ranging is attempted, the minimum transmission level allowed by the system is determined. If the mobile communication terminal directly informs the P2P terminal of its existence as shown in FIG. 5, it decides a high quality service as a desired level of transmission power.

The code mapping unit 1114 selects one of the codes corresponding to the code group corresponding to the transmission power level determined by the power level determination unit 1116 and outputs the selected code to the control unit 1104. Also, the controller 1104 receives the ranging code detected by the controller 1104, and outputs an estimated transmission power value corresponding to the detected ranging code to the link gain estimator 1112. That is, the code mapping unit 1114 determines which code is used according to the transmission power level used by each terminal, and is responsible for determining which code is used by the mobile communication terminal from the received signal.

The link gain estimation unit 1112 receives the measured reception power from the reception power measurement unit 1110 and the estimated transmission power value from the code mapping unit 1114 and calculates a link gain to be supplied to the control unit 1104 Output.

The controller 1104 controls the reception power measurement unit 1110, the link gain estimation unit 1112, the code mapping unit 1114 and the power level determination unit 1116 as a protocol control unit. . The link gain estimating unit 1112, the code mapping unit 1114, and the power level determining unit 1116. The power level determining unit 1116 may be configured to perform the functions of the received power measuring unit 1110, the link gain estimating unit 1112, In the present invention, these are separately configured to distinguish the respective functions. Therefore, in the actual implementation, all of them can be processed by the control unit 1104, and only a part of them can be processed by the control unit 1104.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

1 is a diagram illustrating an example of P2P communication in a mobile communication system,

2 is a diagram illustrating an interference problem of a neighboring terminal in P2P communication in a conventional mobile communication system,

3 is a flowchart of a mobile communication terminal operation for minimizing interference due to P2P communication in the mobile communication system according to the first embodiment of the present invention.

FIG. 4 is a flowchart illustrating an operation of a P2P terminal for minimizing interference to a neighboring mobile communication terminal in the mobile communication system according to the first embodiment of the present invention;

5 is a flowchart of a mobile communication terminal operation for minimizing interference due to P2P communication in a mobile communication system according to a second embodiment of the present invention.

FIG. 6 is a flowchart of a P2P mobile terminal operation for minimizing interference to a neighbor mobile communication terminal in a mobile communication system according to a third embodiment of the present invention;

FIG. 7 is a flowchart illustrating a P2P mobile communication method for minimizing interference to a neighboring mobile communication terminal in a mobile communication system according to a fourth embodiment of the present invention;

8 shows a frame structure used in a broadband wireless communication system,

Fig. 9 is an example of selecting one code in a code group corresponding to each power level,

10 is an exemplary diagram for defining a code corresponding to each power level,

11 is a diagram of a terminal apparatus for minimizing interference due to P2P communication in a mobile communication system according to an embodiment of the present invention.

Claims (28)

  1. A method of operating a mobile communication terminal for reducing interference due to peer-to-peer communication in a mobile communication system,
    Determining a transmission power level;
    Selecting a code corresponding to the transmission power level;
    And transmitting the selected code through an uplink channel,
    Wherein the code is used to determine whether or not P2P communication with another P2P terminal is performed in an adjacent P2P terminal.
  2. The method according to claim 1,
    Wherein the code includes a ranging code previously mapped to the determined transmission power level and is transmitted on an uplink ranging channel.
  3. The method according to claim 1,
    Wherein the transmission power level is determined as a minimum transmission power level according to whether an initial ranging event is generated or is determined as an existing transmission power level used for communication with a base station.
  4. A method of operating a peer to peer (P2P) terminal for reducing interference due to peer-to-peer communication in a mobile communication system,
    Receiving, by the P2P terminal, a code transmitted from a mobile communication terminal to a base station through an uplink;
    Calculating a link gain between the P2P terminal and the mobile communication terminal based on the received code;
    And determining whether P2P communication with another P2P terminal is possible based on the link gain,
    Wherein the code is a code corresponding to a transmission power of the mobile communication terminal.
  5. 5. The method of claim 4,
    Calculating a link gain between the P2P terminal and the mobile communication terminal based on the received code,
    Measuring a received power of the received code;
    Estimating a transmission power level corresponding to the code;
    And calculating a link gain between the P2P terminal and the mobile communication terminal based on a difference between the measured reception power level and the estimated transmission power level.
  6. 5. The method of claim 4,
    And controlling transmission power of the P2P terminal based on the link gain when the P2P communication is enabled.
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  9. 5. The method of claim 4,
    Calculating a link gain between the P2P terminal and the mobile communication terminal based on the received code;
    Measuring a received power of the received code;
    And calculating a link gain based on a difference between the measured reception power and the fixed transmission power of the mobile communication terminal.
  10. 10. The method of claim 9,
    Further comprising the step of acquiring fixed transmission power information of the mobile communication terminal.
  11. 10. The method of claim 9,
    Wherein the mobile communication terminal is a terminal located at an edge of a cell area and is capable of receiving and restoring a signal to a base station and the fixed transmission power is determined considering interference from an adjacent P2P terminal.
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  13. 5. The method of claim 4,
    Calculating a link gain between the P2P terminal and the mobile communication terminal based on the received uplink signal,
    And measuring the strength of the detected received signal,
    Determining whether P2P communication with another P2P terminal is possible based on the link gain,
    And performing P2P communication when the measured signal strength is equal to or less than a preset threshold value.
  14. 14. The method of claim 13,
    The mobile communication terminal receives the downlink signal based on the power of the uplink signal when the measured signal strength is equal to or smaller than a preset threshold value, the distance is away from the P2P terminal to enable P2P communication, To the P2P terminal.
  15. A mobile communication terminal apparatus for reducing interference due to peer-to-peer communication in a mobile communication system,
    A power level determination unit for determining a transmission power level,
    A code mapping unit for selecting a code corresponding to the transmission power level,
    And a controller for transmitting the selected code through an uplink channel,
    Wherein the code is used for determining whether or not P2P communication with another P2P terminal is performed in an adjacent P2P terminal.
  16. 16. The method of claim 15,
    Wherein the code includes a ranging code previously mapped to the determined transmission power level and is transmitted on an uplink ranging channel.
  17. 16. The method of claim 15,
    Wherein the transmission power level is determined as a minimum transmission power level according to whether an initial ranging event is generated or is determined as an existing transmission power level used for communication with a base station.
  18. A peer to peer (P2P) terminal apparatus for reducing interference due to peer-to-peer communication in a mobile communication system,
    A controller for receiving a code transmitted from a mobile communication terminal to a base station through an uplink;
    And a link gain estimator for calculating a link gain between the P2P terminal and the mobile communication terminal based on the received code and determining whether P2P communication with another P2P terminal is possible based on the link gain,
    Wherein the code is a code corresponding to a transmission power of the mobile communication terminal.
  19. 19. The method of claim 18,
    The control unit measures a received power of the received code, estimates a transmission power level corresponding to the code,
    Wherein the link gain estimator calculates a link gain between the P2P terminal and the mobile communication terminal based on a difference between the measured reception power level and the estimated transmission power level.
  20. 19. The method of claim 18,
    Wherein the controller controls transmission power of the P2P terminal based on the link gain when the P2P communication is enabled.
  21. delete
  22. 16. The method of claim 15,
    Wherein the power level determining unit determines the transmission power as a transmission power level satisfying a service quality,
    Wherein the control unit transmits a code corresponding to the transmission power level through an uplink control channel.
  23. 19. The method of claim 18,
    Further comprising a received power measurement unit for measuring the power of the received code,
    Wherein the link gain estimator calculates a link gain based on a difference between the measured received signal power and a fixed transmit power of the mobile communication terminal.
  24. 24. The method of claim 23,
    Wherein the controller acquires fixed transmission power information of the mobile communication terminal.
  25. 24. The method of claim 23,
    Wherein the mobile communication terminal is a terminal located at an edge of a cell region and is capable of receiving and restoring a signal to a base station and the fixed transmission power is determined in consideration of interference from an adjacent P2P terminal.
  26. delete
  27. 19. The method of claim 18,
    And an OFDM receiver for detecting an uplink signal transmitted by the mobile communication terminal,
    Wherein the link gain estimator measures the strength of the detected received signal and performs P2P communication when the measured signal strength is equal to or smaller than a preset threshold value.
  28. 28. The method of claim 27,
    The mobile communication terminal receives the downlink signal based on the power of the uplink signal when the measured signal strength is equal to or smaller than a preset threshold value, the distance is away from the P2P terminal to enable P2P communication, To-peer terminal device.
KR1020070085338A 2007-08-24 2007-08-24 Method and apparatus for reducing interference caused by peer to peer communication in wireless communication system KR101457536B1 (en)

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KR101282538B1 (en) * 2009-12-18 2013-07-04 한국전자통신연구원 Ranging up-signal pre-distortion system and method
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US10149256B2 (en) 2012-07-05 2018-12-04 Lg Electronics Inc. Method for controlling power for device-to-device (D2D) communication in wireless communication system and apparatus for same

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