KR20100103228A - Method of calibrating rot and multi channel transceiver for the same - Google Patents

Method of calibrating rot and multi channel transceiver for the same Download PDF

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Publication number
KR20100103228A
KR20100103228A KR1020090021744A KR20090021744A KR20100103228A KR 20100103228 A KR20100103228 A KR 20100103228A KR 1020090021744 A KR1020090021744 A KR 1020090021744A KR 20090021744 A KR20090021744 A KR 20090021744A KR 20100103228 A KR20100103228 A KR 20100103228A
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KR
South Korea
Prior art keywords
rssi
rot
channel
adjacent channels
transceiver
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KR1020090021744A
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Korean (ko)
Inventor
신현섭
Original Assignee
엘지에릭슨 주식회사
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Priority to KR1020090021744A priority Critical patent/KR20100103228A/en
Publication of KR20100103228A publication Critical patent/KR20100103228A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength

Abstract

PURPOSE: A thermal noise floor set up method and a multichannel transceiver for the same for measuring reference thermal noise of the multi channel transceiver are provided to properly control coverage by compensating the signal size of the transceiver as ROT. CONSTITUTION: An RSSI measuring device measures an RSSI(Received Signal Strength Indication) of the channel received signal. A controller(40) selects two adjacent channels based on the channel RSSI. The adjacent channel interval is established as the narrow-gap region. The controller changes RSSI of the narrow-gap region into an ROT(Rise over Thermal noise). A multichannel transceiver(100) relays the base station and mobile telecommunication terminal. An RF signal processing part(10) amplifies the transmission signal of the base station.

Description

METHOD OF CALIBRATING ROT AND MULTI CHANNEL TRANSCEIVER FOR THE SAME}

The present invention relates to a mobile communication system, and to a reference thermal noise measuring method and a multi-channel transceiver for the same.

In mobile communication systems, many repeaters are used to increase cell coverage and to eliminate shadow areas. The mobile communication terminals located in the service area (area A) of the base station can receive multi-frequency signals transmitted from the base station, but the area (area B) outside the service area of the base station is located in the area B due to relatively poor radio waves. Mobile communication terminals do not receive a multi-frequency signal transmitted from a base station. The multi-frequency signal transmitted from the base station for expanding the service area, that is, the cell coverage, is relayed by the repeater and transmitted to the mobile communication terminal of the area B. The signal transmitted from the mobile communication terminal of the area B is also relayed by the repeater and transmitted to the base station. As such, repeaters used for coverage expansion are changing from a radio frequency (RF) method to a digital baseband method.

In a CDMA mobile communication system, a transceiver may be used in conjunction with a repeater. The thermal noise signal size of each repeater affects the coverage size of the transceiver. Compared to conventional RF repeaters with only duplex and low noise amplifier (LNA), there are relatively more RF components in the transceiver. RF components have a large change in characteristics due to temperature difference, which also causes a significant change in thermal equilibrium noise. Therefore, when using a transceiver as a repeater, the Rise Over Thermal Noise (ROT) magnitude should be measured during service operation, and the radius of the cell (coverage) must be reflected when combining the signal received from the repeater (or base station). Can be adjusted accordingly.

In particular, since the ROT changes according to the change of day and night or the season, it is necessary to calculate the ROT accurately and periodically to maintain and improve the performance of the transceiver. Conventionally, ROT is calculated by reading a received signal strength indicator (RSSI) value of a transceiver in conjunction with a modem of a base station in a state where a call is arbitrarily interrupted. ROT also depends on the hardware characteristics of the RF component. Therefore, assuming that only a thermal balance noise signal is applied at a certain temperature, the ROT varies with the gain and noise figure of the RF component. In addition, since the ROT changes with temperature, the ROT should be newly calculated and compensated when the daily crossover is large or the seasonal change occurs.

In the presence of an arc, the ROT measurement is inaccurate, so in order to accurately calculate the relative value of ROT, it is necessary to know the ROT value without the arc accurately. To this end, conventionally, the ROT value is measured by switching to a measurement mode that excludes a call at night without a call in conjunction with a modem. However, the noise measured in the absence of a call is different from the ROT under the condition that there is a real call with thermal noise as well as other noise.

Provided are a method and a multichannel transceiver for measuring a reference thermal noise (ROT) of a multichannel transceiver during service operation without interrupting a call.

Multi-channel transceiver according to an embodiment of the present invention, the RSSI measuring device operable to measure the received signal strength indication (RSSI) of the received signal for each channel; And selecting two adjacent channels based on the RSSI for each channel, setting the adjacent channels to a narrow band region, converting the RSSI of the narrow band region to rise over thermal noise (ROT), and converting the ROT into a multi-channel transceiver. And a control unit operative to register with a new ROT. The multi-channel transceiver serves as a relay between the base station and the mobile communication terminal.

The multi-channel transceiver includes an RF signal processing unit operable to amplify and filter the transmission signal of the base station; An analog / digital converter (ADC) operable to convert the output signal of the RF signal processor into a digital signal; A plurality of baseband frequency converters operative to separate the output signal of the ADC into a multi-channel signal; A Frequency Allocation (FA) processing unit operable to amplify and filter the output signal of each of the baseband frequency converters; And a baseband variable frequency converter operable to downconvert the frequency band of the narrowband region.

The controller may calculate an average value of the RSSIs of two adjacent channels, select two adjacent channels having the smallest average value of the RSSI, and set the narrowband region. The controller may control the RSSI measurer to measure the RSSI of the narrowband region when the RSSI of each adjacent channel having the smallest RSSI average value is smaller than a reference RSSI.

In accordance with another aspect of the present invention, a method for setting reference row noise (ROT) of a multi-channel transceiver includes: setting a narrow band region between two adjacent channels among a plurality of channels; Measuring an RSSI of the narrowband region; Converting the RSSI of the narrow band region into rise over thermal noise (ROT); And registering the ROT as a new ROT of the multi-channel transceiver.

The setting of the narrow band region may include measuring a received signal strength indication (RSSI) of a received signal for each channel; Calculating the RSSI average of adjacent channels; Searching for two adjacent channels having the smallest RSSI average value; Determining whether an RSSI of each searched adjacent channel is smaller than a preset reference RSSI; And setting the narrow band region between the two adjacent channels if the RSSI of each of the searched adjacent channels is smaller than a reference RSSI.

After converting the RSSI of the narrowband region to the ROT, the method may further include determining whether the ROT is within a predetermined size range, and if the ROT is within a predetermined size range, converting the converted ROT into a new ROT of a multi-channel transceiver. You can register with

According to the present invention, the multi-channel transceiver can calculate the reference thermal noise (ROT) of the transceiver relatively accurately even during service operation without any interruption of the call. In addition, coverage can be properly adjusted by compensating for the signal size of the transceiver with a more accurately calculated ROT.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention.

1 is a schematic diagram illustrating transmission and reception of a multi-channel signal between a multi-channel transceiver 100 and a base station BS according to an embodiment of the present invention. The multi-channel signals FA 1 to FA n transmitted from the base station BS may be transmitted to the mobile communication terminal TA in the service area A, but may be transmitted to the mobile communication terminal TB in the service area B. I can't. The base station BS transmits a transmission signal Fα having a frequency different from that of the multi channel signals FA 1 to FA n to the multi channel transceiver 100. Signals between the base station (BS) and the transceiver 100 may be transmitted and received through the optical path, but is not limited thereto. For example, wireless transmission and reception are also possible. The frequency signal Fα transmitted from the base station BS is converted to the multi channel signals FA 1 to FA n in the multi channel transceiver 100 as a combination of the multi channel signals FA 1 to FA n , thereby providing a service area B. Is transmitted to the mobile communication terminal (TB). As such, the multi-channel transceiver according to the present invention serves as a relay between the base station and the mobile communication terminal.

The multi-channel transceiver of the present invention measures the strength of a received signal for each channel, that is, received signal strength indication (RSSI), selects two adjacent channels (3FA, 4FA) having a small RSSI as shown in FIG. The narrow band region (guard band) is set between (3FA and 4FA). The RSSI of the narrowband region is converted into an ROT, and if the ROT obtained from the RSSI is within a predetermined size range, the ROT is registered as a new ROT of the multi-channel transceiver.

To implement this, as shown in FIG. 3, the RF signal processor 10 of the multi-channel transceiver receiver according to the embodiment of the present invention amplifies and filters the transmission signal Fa of the base station BS, and converts the analog / digital converter. An analog digital converter (ADC) 20 converts an output signal of the RF signal processing unit 10 into a digital signal.

The output signal of the ADC 20 is separated into independent multi-channel signals FA 1 to FA n through the baseband frequency converters 31-1 to 31-n of the digital signal processor 30, and frequency (Frequency Allocation) It is input to the process parts 32-1 to 32-n. The FA processing units 32-1 to 32-n amplify and filter the signal before being transmitted to the modem (not shown). The baseband variable frequency converter 33 down-converts the frequency band of the narrow band region. The RSSI measuring unit 34 measures the RSSI of the channel-specific signals output from the FA processing units 32-1 to 32-n and the RSSI of the narrow band region.

The control unit 40 controls the RSSI measuring unit 34 to measure the RSSI of the frequency signal for each channel, selects two adjacent channels having a small RSSI, and sets a narrow band region between the selected adjacent channels. The narrowband region is an area where no signal exists between two adjacent channels. In order to ensure that the RSSI in the narrowband region indicates that the multi-channel transceiver is in thermal equilibrium, the signals of two adjacent channels are preferably as small as possible, even during call service. In an embodiment of the present invention, the controller 40 calculates an average value of RSSIs of two adjacent channels, and selects two adjacent channels having the smallest average value of RSSIs to set a narrow band region. For example, the RSSI of adjacent frequencies (channels) among the multi-channel signals 1FA to 7FA of FIG. 2 is averaged (RSI average of 1FA and 2FA, RSSI average of 2FA and 3FA, RSSI average of 3FA and 4FA, etc.), Neighboring channels 3FA and 4FA having the smallest RSSI average value are searched and a narrow band region is set between the channels 3FA and 4FA.

Since there is no communication signal in the ideal narrowband region, only reference thermal noise (ROT) can be measured. In practice, however, if the signals of the channels adjacent to the narrowband region are large, there is a signal leaking into the narrowband region. Therefore, the narrowband region should be set between two channels with the smallest RSSI. To this end, the controller 40 determines whether the RSSI of the adjacent channels 3FA and 4FA having the smallest RSSI average value is smaller than the preset reference RSSI as shown in FIG. 2, and if the RSSI of each of the adjacent channels 3FA and 4FA is smaller than the reference RSSI, The RSSI meter 34 is controlled to measure the RSSI of the narrow band region set between the adjacent channels 3FA and 4FA.

In addition, the controller 40 converts the RSSI of the narrow band region into the ROT. RSSI can be converted to ROT according to known techniques. For example, the following equation 1 or equation 2 can be used.

ROT (dB) = RSSI (dBm) -Thermal_Noise_Floor (dBm)

RoT = 10log (RSSI / P)

In Equations 1 and 2, RSSI includes noise as all wideband power at the measurement location. If the ROT converted from the RSSI is within a predetermined size range, the controller 40 registers the ROT converted from the RSSI as a new ROT of the multi-channel transceiver.

FIG. 4 is a flowchart illustrating a method of setting reference row noise (ROT) of the multi-channel transceiver shown in FIG. 3.

Under the control of the control unit 40, the RSSI measuring unit 34 measures the RSSI of the signal for each channel output from the FA processing units 32-1 to 32-n (ST41). The controller 40 calculates an RSSI average of adjacent channels.

The controller 40 searches for two adjacent channels 3FA and 4FA having the smallest RSSI average value as shown in FIG. 2 (ST42), and determines whether the RSSI of the adjacent channels 3FA and 4FA is smaller than the preset reference RSSI (ST43).

As a result of the step ST43, if the RSSI of the two channels 3FA and 4FA is not smaller than the reference RSSI, the ROT measurement procedure is terminated.

If the RSSI of each of the two channels 3FA and 4FA is smaller than the reference RSSI, a narrow band region is set between two adjacent channels 3FA and 4FA, and the RSSI of the narrow band region is measured (ST44).

The RSSI of the narrow band region is converted into an ROT (ST45), and it is determined whether the ROT converted from the RSSI is within a predetermined size range (ST46). If the ROT converted from the RSSI is within a certain size range, the ROT is registered as a new ROT of the multi-channel transceiver (ST47) and ends. With the newly registered ROT, the cell radius (coverage) of the multi-channel transceiver is adjusted.

According to the present invention, the ROT that changes from time to time depending on the environment, such as temperature, can be measured by the multi-channel transceiver alone, even in the presence of a call so that the cell radius can be adjusted.

Although the above methods have been described through specific embodiments, the above-described data transfer method may be embodied as computer readable codes on a computer readable recording medium. Computer-readable recording media include all kinds of recording devices that store data that can be read by a computer system. Examples of the computer-readable recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and may be implemented in the form of a carrier wave (for example, transmission via the Internet) . The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. In addition, functional programs, codes, and code segments for implementing the above embodiments can be easily deduced by programmers of the present invention.

In addition, while the present invention has been described in connection with some embodiments, it is to be understood that various modifications and changes can be made without departing from the spirit and scope of the invention as will be understood by those skilled in the art. You will need to know It is also contemplated that such variations and modifications are within the scope of the claims appended hereto.

1 is a schematic diagram showing multi-channel signal transmission and reception between a multi-channel transceiver and a base station according to an embodiment of the present invention.

2 is an explanatory diagram showing a narrow band region designated between adjacent channels;

Figure 3 is a block diagram showing the configuration of a receiver of a multi-channel transceiver according to an embodiment of the present invention.

4 is a flowchart illustrating a method of setting reference string noise of a multi-channel transceiver according to an exemplary embodiment of the present invention.

* Explanation of Reference Numbers *

100: multi-channel transceiver (100)

10: RF signal processing unit 10

20: analog / digital converter

30: baseband digital signal processor

31-1 to 31-n: baseband frequency converter

32-1 to 32-n: FA (Frequency Allocation) processing unit

33: baseband variable frequency converter

34: narrowband RSSI meter

Claims (8)

As a multi-channel transceiver, An RSSI meter operable to measure a received signal strength indication (RSSI) of a received signal for each channel; And Select two adjacent channels based on the RSSI for each channel, set a narrow band region between the adjacent channels, convert RSSI of the narrow band region to rise over thermal noise (ROT), and And a control unit operative to register with the ROT. The method of claim 1, The multi-channel transceiver serves as a relay between the base station and the mobile communication terminal. The method of claim 2, The multi-channel transceiver, An RF signal processor operable to amplify and filter the transmission signal of the base station; An analog / digital converter (ADC) operable to convert the output signal of the RF signal processor into a digital signal; A plurality of baseband frequency converters operative to separate the output signal of the ADC into a multi-channel signal; A Frequency Allocation (FA) processing unit operable to amplify and filter the output signal of each of the baseband frequency converters; And And a baseband variable frequency converter operative to downconvert the frequency band of the narrowband region. The method of claim 1, The control unit, Calculate an average value of RSSIs of two adjacent channels; And selecting two adjacent channels having the smallest average value of the RSSI to set the narrow band region between the selected adjacent channels. The method of claim 4, wherein The control unit, And if the RSSI of each adjacent channel having the smallest RSSI average value is smaller than a reference RSSI, controlling the RSSI meter to measure the RSSI of the narrowband region. As a method of setting reference row noise (ROT) of a multi-channel transceiver, Setting a narrow band region between two adjacent channels among the plurality of channels; Measuring an RSSI of the narrowband region; Converting the RSSI of the narrow band region into rise over thermal noise (ROT); And Registering the ROT as a new ROT of a multi-channel transceiver. The method of claim 6, Setting the narrowband region, Measuring a received signal strength indication (RSSI) of a received signal for each channel; Calculating the RSSI average of adjacent channels; Searching for two adjacent channels having the smallest RSSI average value; Determining whether an RSSI of each searched adjacent channel is smaller than a preset reference RSSI; And And if the RSSI of each of the retrieved adjacent channels is smaller than a reference RSSI, setting between the two adjacent channels as the narrow band region. The method according to claim 6 or 7, After converting the RSSI of the narrowband region to an ROT, determining whether the ROT is within a predetermined size range, And registering the converted ROT as a new ROT of a multi-channel transceiver when the ROT is within a predetermined size range.
KR1020090021744A 2009-03-13 2009-03-13 Method of calibrating rot and multi channel transceiver for the same KR20100103228A (en)

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