KR100939440B1 - System and Method for expanding service range of base station - Google Patents

Abstract

The present invention provides a system for extending a service range of a base station, wherein when downlink traffic including a synchronization indication signal is received from the base station by wire connection with the base station, the synchronization is acquired using the synchronization indication signal to obtain a corresponding downlink. At least one repeater for delaying link traffic by a pre-assigned transmission signal delay value, and an available diversity resource provided to the base station and each repeater by setting an available diversity resource and a transmission signal delay value for each base station and repeater. It is composed of an allocation device, by setting the transmission time difference of the signal for each of the base station and the repeater in the signal overlap environment between the base station and the repeater can reduce the performance degradation that can occur outside the service range of the base station and the repeater.

Repeater, Downlink, Base Station

Description

System and Method for expanding service range of base station

The present invention allocates a transmission signal delay value to each of the base station and the repeater in a signal overlapping environment between the base station and one or more repeaters connected by wire with the base station, wherein each repeater includes a synchronization indication signal transmitted from the base station. The present invention relates to a system and a method for extending a service range of a base station by delaying downlink traffic by the transmission signal delay value and transmitting the delayed downlink traffic.

When designing a multicell multimedia communication system based on orthogonal frequency-division multiplexing (OFDM), high frequency efficiency can be obtained, multi-antenna technology can be efficiently applied, and high hardware efficiency can be obtained in compensating broadband channel environment. In this way, it is possible to construct a broadband communication system with high economical efficiency.

Therefore, most of the next generation multi-cell multimedia communication systems such as WiMax and 3GPP LTE (LTE term evolution) adopt OFDM as a basic technology.

In case of using the OFDM technology, even if the signals are transmitted from multiple transmitters, all of these signals can be regarded as signal components if the sum of time intervals between the various transmitted signals observed at the receiving end is within the OFDM symbol cyclic prefix. It does not cause performance degradation, and the hardware complexity required to compensate for such a channel environment does not change significantly.

In a system network configuration environment in which a service range is extended by using a relay in a general multi-cell system, a signal overlap situation is indispensable, which can be a great advantage.

On the other hand, in an OFDM system in which channel coding is performed over the entire frequency domain, the higher the frequency selectivity of the channel, that is, the more multipaths of the channel, the higher and more stable signal decoding performance is. This is because when the frequency selectivity of the channel is low, at some point in time, due to the effects of fading, a signal of low magnitude may be received throughout the frequency band used. This is because the average received signal power of the entire frequency band is maintained at a relatively constant value even though the signal is small due to fading, so that fading loss recovery using channel coding is possible.

However, when designing a network environment that extends the service range by using a repeater or the like in a conventional multi-cell system, signal overlap between the parent base station and the relay is maintained because the wired connection time delay between the parent base station and the relay is kept the same. In the interval, all signals are received by the terminal at the same time, or the received signal between the parent base station and the relay is received at the same time in the overlapping area between the relays, even if there is some time gap between the received signals. Done.

In this case, a gain due to an increase in average signal power generated by receiving multiple transmission signals can be expected, but a gain in diversity gain for overcoming fading occurring in a propagation environment cannot be obtained.

Accordingly, an object of the present invention is to set the transmission time difference for the parent base station and the repeater network so that the diversity gain can be obtained evenly in the signal overlapping environment between the parent base station and the repeaters, so that it occurs outside the service range of the base station and the repeater. The present invention provides a system and method for extending the service range of a base station that can reduce performance degradation.

It is another object of the present invention to set high and stable multipath diversity gain by maximizing the transmission time difference value between each repeater and the base station and the transmission time difference value between the repeaters in the signal overlapping environment between the parent base station and the repeaters. The present invention provides a system and method for extending the service range of a base station capable of obtaining signal decoding performance.

It is another object of the present invention to provide a multipath diversity gain that maximizes the transmission signal time difference between multiple antennas when a base station and a repeater use multiple antennas in a signal overlapping environment between a parent base station and repeaters. The present invention provides a system and method for extending a service range.

According to an aspect of the present invention to achieve the above object, in the system for extending the service range of the base station, when the downlink traffic including the synchronization indication signal is received from the base station by a wired connection to the base station, Acquire synchronization using a synchronization indication signal to set at least one repeater for transmitting a corresponding downlink traffic by a pre-assigned transmission signal delay value, and then transmit available diversity resources and transmission signal delay values for each base station and each repeater. There is provided a system for extending the service range of the base station, characterized in that it comprises an available diversity resource allocation device provided to the base station and each repeater.

The apparatus for allocating available diversity resources obtains the number of available diversity resources by using the multipath time for each base station and each repeater and the guard interval length in an OFDM symbol, and neighbors the available diversity resources corresponding to the obtained number. Allocating so as not to overlap by the base station or the repeater.

The available diversity resource allocation apparatus sets the delay value such that the time obtained by subtracting the maximum propagation delay time from the arrival signal time at the communication terminal becomes the transmission signal time.

According to another aspect of the present invention, an available diversity resource allocation apparatus for allocating a transmission signal delay value to at least one repeater wired to the base station for extending the service range of the base station, the multiple times of the base station and each relay period Parameter collection unit for collecting the path time and the guard interval length in the OFDM symbol, the signal arrival time offset value is selected in consideration of the multi-path time collected by the parameter collector and the physical characteristics and hardware implementation characteristics of the channel, Available diversity resource number calculator configured to set a value obtained by dividing the guard interval length collected by the parameter collector by the selected offset value to the number of available diversity resources, and corresponds to the number set by the available diversity resource number calculator. Available diversity resources to neighboring base stations or among The diversity of available resource allocation apparatus, comprising groups diversity resource allocation assigning do not overlap by portion is provided.

An apparatus for allocating available diversity resources is provided, further comprising a transmission signal delay value setting unit for setting a transmission signal delay value for transmitting the corresponding downlink traffic to the communication terminal for the base station and each repeater.

The transmission signal delay value may be a delay value such that the time obtained by subtracting the maximum propagation delay time from the arrival signal time at the communication terminal becomes the transmission signal time.

The diversity resource allocator sets a diversity reuse coefficient in an area where signals overlap, and neighbors the available diversity resources corresponding to the number set by the available diversity resource count calculator based on the set diversity reuse coefficient. Allocating so as not to overlap by the base station or repeater.

The diversity reuse coefficient may be a value equal to or greater than the number of overlapping signals and equal to or smaller than the number of available diversity resources.

According to another aspect of the present invention, a repeater is connected to the base station by wire to expand the service range of the base station, and transmits the downlink traffic transmitted from the base station to the communication terminal through a wireless transceiver, the down from the base station The transmission signal delay value allocated by the wired interface unit for receiving link traffic and the available diversity resource allocation device is stored, and after delaying the downlink traffic received through the wired interface unit by the stored transmission signal delay value, Recognizing a synchronization signal in downlink traffic received through the wired interface unit by using a signal processor transmitted through a wireless transceiver and pre-stored frame structure information, and recognizing a synchronization signal for transmitting the recognized synchronization signal to the signal processor. Include wealth The repeater according to claim is provided.

The downlink traffic received through the wired interface unit includes a synchronization indication signal for recognizing synchronization.

The signal processor delays the downlink traffic by the transmission signal delay value by using the synchronization signal transmitted from the synchronization signal recognizer and then transmits the signal through the wireless transceiver.

According to another aspect of the present invention, a method for transmitting downlink traffic to a communication terminal in which each repeater is located in a signal overlap area in a system in which at least one repeater is wired to extend the service range of the base station, the base station When the downlink traffic is received from the mobile station, the synchronization signal in the downlink traffic is recognized using the synchronization indication signal included in the downlink traffic, and the corresponding downlink traffic is transmitted using the recognized synchronization signal. Provided is a method for transmitting downlink traffic for extending a service range of a base station, wherein the delay is delayed as much as it is transmitted to the communication terminal.

According to another aspect of the present invention, in the method for setting the transmission signal delay value for each repeater in a system in which at least one repeater is connected by wire to expand the service range of the base station, the multi-path time and OFDM of the base station and the repeater period Collects the guard interval length in the symbol, selects a signal arrival time offset value in consideration of the collected multipath time and the physical characteristics and hardware implementation characteristics of the channel, and converts the collected guard interval length into the selected offset value The divided value is set to the number of available diversity resources, the available diversity resources corresponding to the set number are allocated so as not to overlap with an adjacent base station or repeater, and the maximum propagation delay time between the base station and each relay period is used. To set the transmission signal delay value for each repeater Provided is a method for setting a transmission signal delay value for each repeater for extending a service range of a base station.

Allocating available diversity resources corresponding to the set number so as not to overlap by an adjacent base station or repeater sets a diversity reuse coefficient in an area where transmission signals overlap and sets the diversity reuse coefficient based on the set diversity reuse coefficient. This means that the available diversity resources corresponding to the set number are allocated not to be overlapped by neighboring base stations or repeaters.

As described above, according to the present invention, a signal transmission time difference is set for each of the base station and the repeater in the signal overlapping environment between the base station and the repeaters to reduce the performance degradation that may occur outside the service range of the base station and the repeater. It is possible to provide a system and method for extending the service range of a base station that can be reduced.

In addition, in the signal overlapping environment between the base station and the repeaters, the transmission time difference value between each repeater and the base station and the transmission time difference value of each of the repeaters are set to maximize the multipath diversity gain, thereby achieving high and stable signal decoding performance. It is possible to provide a system and method for extending the service range of a base station.

In addition, when the base station and the repeater uses multiple antennas in a signal overlapping environment between the parent base station and the repeaters, a signal transmission time difference value between the multiple antennas is used to extend the service range of the base station to maximize the multipath diversity gain. Systems and methods can be provided.

In addition, since the propagation environment is stabilized by obtaining diversity in downlink, all communication terminals can obtain high and stable communication link performance, so that communication at the edge of the service range provided by the base station and the repeater is provided. It is possible to provide a system and method for extending a service range of a base station in which a radio wave environment for terminals is improved, and service quality is improved, such as a reduction in service delay time and an improvement in real-time service quality.

In addition, since there is no need to change the communication standard between the system and the communication terminal can provide a system and method for extending the service range of the base station that can be flexibly applied to the system network configuration for performance improvement.

Details of the above-described objects and technical configurations of the present invention and the resulting effects thereof will be more clearly understood from the following detailed description based on the accompanying drawings.

1 is a conceptual diagram illustrating a system for extending a service range of a base station according to the present invention, and FIG. 2 is a diagram illustrating a configuration of a system for extending a service range of a base station according to the present invention.

Referring to FIG. 1, in order to extend the service range of the base station 100, at least one repeater 110a, 110b,... 110n, hereinafter referred to as 110, is connected to the base station 100 by wire.

In this case, when the base station 100 and the repeater 110 share the same frequency resources, the service ranges of the base station 100 and the repeater 110 overlap each other, and the communication terminal 120 existing in the overlapping area is the base station 100 and the repeater. A signal transmitted from each antenna of 110b is allowed to arrive with a specific time offset.

The service range extension system of the base station will be described in detail with reference to FIG. 2.

Referring to FIG. 2, a system for extending a service range of a base station includes diversity resources available to a base station 200, at least one repeater 210 connected by wire with the base station 200, the base station 200, and the repeater 210. It includes an available diversity resource allocation device 220 for allocating.

The available diversity resource allocation device 220 sets a transmission signal delay value for each of the base station 200 and the repeater 210 existing in the downlink signal overlapping area to maximize the multipath diversity gain. do.

That is, the available diversity resource allocation device 220 obtains the number of available diversity resources using the multipath time and the guard interval length in the ODFM symbol, and uses the available diversity resources corresponding to the obtained number as the base station. The repeater 210 connected with the 200 is allocated to be reused without being duplicated.

 Then, the available diversity resource allocation device 220 determines a transmission signal delay value to be generated in each of the transmission antennas of the base station 200 and the repeater 210 so that the reception signal timing of the diversity resource can occur in the repeater overlap region. Set it. When the signal is transmitted, the available diversity resource allocation apparatus 220 sets a transmission time delay value in consideration of the maximum propagation time required for radio wave propagation and the arrival of the signal at the communication terminal.

Then, the communication terminal existing in the signal overlap region receives a signal from the base station 200 and the repeater 210 with a specific time offset according to the transmission signal delay value set by the available diversity resource allocation apparatus 220. do.

Detailed description of the available diversity resource allocation apparatus 220 which performs the above role will be described with reference to FIG. 3.

The repeater 210 is connected to the base station 200 by wire in order to extend the service range of the base station 200, and transmits downlink traffic including a synchronization indication signal from the base station 200 through a wired interface unit. Receive. Here, the synchronization indication signal may be a signal capable of informing synchronization information such as frame synchronization and symbol synchronization with respect to the corresponding traffic.

That is, the base station 200 transmits the corresponding downlink traffic to each repeater connected by wire through the wired interface unit before transmitting the corresponding downlink traffic wirelessly. This is a necessary process for synchronizing the received signal in the overlapped area because a signal delay occurs while passing through the wired interface and the signal processing time in the repeaters 210 is required.

In addition, the repeater 210 stores the transmission signal delay value transmitted from the available diversity resource allocation apparatus 220, and when downlink traffic is transmitted from the base station 200, After the delay, the downlink traffic is transmitted through the wireless transceiver.

For a detailed description of the repeater 210 to perform the above role will be described with reference to FIG.

3 is a block diagram schematically illustrating a configuration of an apparatus for allocating available diversity resources according to the present invention.

Referring to FIG. 3, the apparatus for allocating available diversity resources includes a parameter collecting unit 300, an available diversity resource number calculating unit 310, a diversity resource allocating unit 320, and a transmission signal delay value setting unit 330. Include.

The parameter collecting unit 300 collects the multipath time of the base station and each relay period and the guard interval length in the OFDM symbol.

The available diversity resource number calculator 310 offsets the optimal diversity effect in the network in consideration of the multipath time collected by the parameter collector 300, the physical characteristics of the channel, the hardware implementation characteristics, and the like. The value is selected and a value obtained by dividing the guard interval length collected by the parameter collector 300 by the selected offset value is set to the number of available diversity resources. Here, the number of available diversity resources means the number of relative signal arrival times.

The diversity resource allocator 320 allocates the available diversity resources corresponding to the number calculated by the available diversity resource number calculator 310 so that the repeaters connected to the base station can be reused without overlapping.

That is, the diversity resource allocator 330 finds an area where the transmission signals of the most antennas overlap and sets the diversity reuse coefficient. Here, the diversity reuse coefficient is set to a value equal to or greater than the number of overlapping signals and equal to or smaller than the number of available diversity resources.

The diversity resource allocator 320 then uses the available diversity resources corresponding to the number calculated by the available diversity resource rewriting calculation unit 310 for each of the antennas of the base station and the repeater based on the set diversity reuse coefficient. It is allocated so that the repeater connected to the base station can be reused without overlapping.

The transmission signal delay value setting unit 330 sets a transmission signal delay value to be generated in the transmission antenna of each of the base station and the repeater so that the reception signal timing of the diversity resource can occur in the signal overlap region.

Setting the transmission signal delay value for each of the base station and the repeater is for synchronizing the reception signal in the overlap area. Here, the transmission signal delay value may be a delay value such that the time obtained by subtracting the maximum propagation delay time from the arrival signal time at the communication terminal becomes the transmission signal time.

The base station and the repeater delays by the time corresponding to the transmission signal delay value set by the transmission signal delay value setting unit 330, and then transmits the corresponding downlink traffic.

 Figure 4 is a block diagram schematically showing the configuration of a repeater according to the present invention.

Referring to FIG. 4, the repeater includes a wired interface unit 400 for interfacing with a base station, a wireless transceiver 410, a synchronization signal recognition unit 420, and a signal processor 430.

The signal processor 430 stores a transmission signal delay value allocated by the available diversity resource allocation apparatus.

Accordingly, the signal processing unit 430 delays downlink traffic received through the wired interface unit 400 by the stored transmission signal delay value, and then transmits it through the wireless transmission / reception unit 410. The downlink traffic received through the wired interface unit 400 includes a synchronization indication signal.

The sync signal recognition unit 420 generates a sync signal of a form required by the signal processor 430 using the prestored frame structure information and transmits the sync signal to the signal processor 430.

That is, the sync signal recognizer 420 recognizes frame sync and symbol sync of a signal temporarily stored in the signal processor 430 by using frame structure information, and then converts the recognized sync signal into the signal processor 430. To transmit.

Then, the signal processor 430 generates a signal delayed by a transmission signal delay value for each OFDM symbol by using the synchronization signal transmitted from the synchronization signal recognition unit 420 and transmits the signal through the wireless transceiver 410. .

5 is a flowchart illustrating a method for allocating available diversity resources for each repeater in order to expand the service range of a base station according to the present invention. FIG. 6 is a diagram for each transmission when there are four available diversity resources in a single path channel environment according to the present invention. 7 illustrates an example of signal delay processing performed by an antenna, and FIG. 7 illustrates an example of available diversity resource allocation when the diversity reuse coefficient is 3 and the number of available diversity resources is 3; 8 is an exemplary diagram of available diversity resource allocation when the diversity reuse coefficient is 4, the number of available diversity resources is 5, and two transmission antennas exist in each repeater.

Referring to FIG. 5, the apparatus for allocating available diversity resources collects a multipath time of a base station, each relay period, and a guard interval length in an OFDM symbol (S500).

Then, the available diversity resource allocation apparatus selects an offset value for achieving an optimal diversity effect in the network in consideration of the collected multipath time, physical characteristics of a channel, hardware implementation characteristics, and the like, and the collected guard interval The number of available diversity resources is set by dividing the length by the selected offset value (S502). The number of available diversity resources may be a value obtained by dividing the guard interval length by the offset.

)의 배수로 송신 신호 지연을 발생시키는 경우, OFDM 심볼간 간섭이 일어나 수신단 복호 성능 저하가 발생하지 않도록 하려면 오프셋의 3배까지 수신 신호를 지연시킬 수 있음을 알 수 있다. Referring to FIG. 6 for setting the number of available diversity resources, an offset value (

When the transmission signal delay is generated in multiples of), it can be seen that the received signal can be delayed up to three times the offset in order to prevent interference between OFDM symbols and deterioration of the receiver decoding performance.

That is, since the sum of the time intervals between the various transmission signals must be included within the OFDM symbol protection interval, the available diversity resources that can be used may be four from D0 to D3.

Referring to FIG. 5 again, after performing step 502, the apparatus for allocating available diversity resources allocates the available diversity resources corresponding to the set number so that the repeaters connected to the base station can be reused without overlapping (S504).

A method of allocating available diversity resources by the apparatus for allocating available diversity resources will be described with reference to FIGS. 7 and 8.

First, referring to FIG. 7, since the diversity reuse coefficient is 3 and the number of available diversity resources is three (D0, D1, and D2), D0 is allocated to the base station 700 and D1 is assigned to the first repeater 710. Allocation, D2 is allocated to the second repeater 720, D1 is allocated to the third repeater 730, and D0 is allocated to the fourth repeater 740.

Here, since the base station 700, the fourth repeater 740, the first repeater 710 and the third repeater 730 do not overlap each other, the same diversity resources can be allocated.

That is, since the diversity resources should not overlap in the overlapping area of the base station and the repeater, it can be seen that different diversity resources are allocated to each transmit antenna.

Next, referring to FIG. 8, the diversity reuse factor is 4, the number of available diversity resources is 5 (D0, D1, D2, D3, and D4), and two transmitting antennas exist in each relay, and the base station and the relay period It shows the case where there is one wired connection line of.

Therefore, D0 is allocated to the base station 800, each antenna of the first repeater 810 is assigned to D1, D2, and each antenna of the second repeater 820 is not overlapped with the base station 800 and the second repeater 820. D3, D4 assignment so as not to overlap with each antenna of the first repeater 810 and the third repeater 830, D1, so as not to overlap with each antenna of the second repeater 820 in each antenna of the third repeater 830 Allocate D2.

That is, since diversity resources should not overlap in an overlapping region of the base station and the repeater, different diversity resources should be allocated to each transmit antenna.

As described above, different diversity resources are allocated to each transmit antenna to maintain one wired connection line between the base station and the relay period, thereby economically configuring the infrastructure, and using four transmit antennas in the repeater service overlapping section. The performance effect in the base station that implements can be expected.

As described above, a method for allocating available diversity resources by the apparatus for allocating available diversity resources will be described with reference to FIG. 8.

After performing step 504, the available diversity resource allocation apparatus sets a transmission signal delay value to be generated in each transmission antenna of the base station or the repeater so that the reception signal timing of the diversity resource can occur in the signal overlap region (S506). .

The transmission signal delay value may be a delay value such that the time obtained by subtracting the maximum propagation delay time from the arrival signal time at the communication terminal becomes the transmission signal time.

The apparatus for allocating available diversity resources provides a corresponding transmission signal delay value set for each repeater.

9 is a flowchart illustrating an available diversity resource allocation method according to the present invention.

Referring to FIG. 9, the available diversity allocation apparatus finds an area where the transmission signals of most antennas overlap (S900) and sets a diversity reuse coefficient (S902).

The diversity reuse coefficient is set to a value equal to or greater than the number of overlapping signals and equal to or smaller than the number of available diversity resources.

Then, the available diversity allocation apparatus does not overlap the repeater connected to the base station with the available diversity resources corresponding to the number of available diversity resources preset in each of the transmission antennas of each base station or repeater based on the set diversity reuse coefficient. It allocates to be reusable without using (S904).

10 is a flowchart illustrating a method for transmitting downlink traffic by a repeater existing in an overlapping area according to the present invention.

Referring to FIG. 10, when the downlink traffic is received from the base station through the wired interface unit (S1000), the repeater determines whether a time corresponding to a pre-assigned transmission signal delay value has elapsed (S1002). The transmission signal delay value is a value set by the available diversity allocation device and may be different for each repeater.

If it is determined in step 1002 that the time corresponding to the transmission signal delay value has elapsed, the repeater wirelessly transmits the received downlink traffic through the antenna (S1004).

By the above process, the communication terminal existing in the overlapped area receives downlink traffic at specific time intervals from each repeater, so that signal overlap does not occur.

11 is a diagram illustrating a packet error rate performance test result according to the number of available diversity resources and an offset value according to the present invention.

Referring to FIG. 11, it can be seen that the performance is improved as the number of available diversity resources is increased, and the diversity performance can be greatly increased by using an appropriate offset value.

Diversity performance is represented by the slope of the curve. If the offset value is 0, the received signal is overlapped without offset, and there is no additional diversity gain, so the additional performance obtained by the difference in slope is increased even if the value of the available diversity resource is increased. none.

However, by using an appropriate offset value, it is possible to increase the magnitude of the gradient as the value of the available diversity resource increases.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

As described above, the system and method for extending the service range of the base station according to the present invention can be used in a technique capable of increasing the diversity gain in the signal overlap region.

1 is a conceptual diagram illustrating a system for extending a service range of a base station according to the present invention.

2 is a diagram illustrating a configuration of a system for extending a service range of a base station according to the present invention;

3 is a block diagram schematically illustrating a configuration of an apparatus for allocating available diversity resources according to the present invention;

 Figure 4 is a block diagram schematically showing the configuration of a repeater according to the present invention.

5 is a flowchart illustrating an available diversity resource allocation method for each repeater in order to extend a service range of a base station according to the present invention.

6 is a diagram illustrating an example in which signal delay processing is performed at each transmit antenna when there are four available diversity resources in a single path channel environment according to the present invention.

7 is an exemplary diagram of available diversity resource allocation when the diversity reuse coefficient is 3 and the number of available diversity resources is 3 according to the present invention.

8 is an exemplary diagram of available diversity resource allocation when the diversity reuse coefficient is 4, the number of available diversity resources is 5, and two transmission antennas exist in each repeater.

9 is a flowchart illustrating an available diversity resource allocation method according to the present invention.

10 is a flowchart illustrating a method in which a repeater existing in an overlapping area transmits downlink traffic according to the present invention.

11 illustrates packet error rate performance test results according to the number of available diversity resources and an offset value according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100, 200: base station 110, 210: repeater

120: communication terminal 220: available diversity resource allocation device

300: parameter collection unit 310: available diversity resource number calculation unit

320: diversity resource allocation unit 330: transmission signal delay value setting unit

400: wired interface unit 410: wireless transceiver

420: synchronization signal recognition unit 430: signal processing unit

Claims (14)

In the system for extending the service range of the base station, When the downlink traffic including the synchronization indication signal is received from the base station by wire connection with the base station, synchronization is obtained using the synchronization indication signal, and the downlink traffic is delayed by a pre-allocated transmission signal delay value. At least one repeater for sending out; and A delay value is set to a transmission time delay value so that a time obtained by subtracting the maximum propagation delay time from the signal diversity time of the base station and each repeater and the signal arrival time of the communication terminal is a transmission time delay value and provides the base station and each repeater. Diversity resource allocation device System for extending the service range of the base station comprising a. The method of claim 1, The apparatus for allocating available diversity resources obtains the number of available diversity resources by using the multipath time for each base station and each repeater and the guard interval length in an OFDM symbol, and neighbors the available diversity resources corresponding to the obtained number. System for extending the service range of the base station, characterized in that not allocated to the base station or the repeater. delete An apparatus for allocating diversity resources to allocate a transmission signal delay value to at least one repeater connected by wire to the base station for extending a service range of a base station, A parameter collecting unit for collecting the multipath time between the base station and each relay period and the guard interval length in an OFDM symbol; A signal arrival time offset value is selected in consideration of the multipath time collected by the parameter collector and the physical characteristics and hardware implementation characteristics of the channel, and the guard interval length collected by the parameter collector divided by the selected offset value. Available diversity resource number calculation unit for setting the number of available diversity resources; And Diversity resource allocator for allocating the available diversity resources corresponding to the number set by the available diversity resource number calculator so as not to overlap with an adjacent base station or repeater. Available diversity resource allocation apparatus comprising a. The method of claim 4, wherein And a transmission signal delay value setting unit for setting a transmission signal delay value for transmitting corresponding downlink traffic to a communication terminal for the base station and each relay. The method of claim 5, And the transmission signal delay value is a value such that a time obtained by subtracting a maximum propagation delay time from a signal arrival time at a communication terminal becomes a transmission signal time. The method of claim 4, wherein The diversity resource allocator sets a diversity reuse coefficient in an area where signals overlap, and neighbors the available diversity resources corresponding to the number set by the available diversity resource count calculator based on the set diversity reuse coefficient. The apparatus for allocating diversity resources according to claim 1, wherein the allocation is possible so as not to overlap the base station or the repeater. The method of claim 7, wherein And the diversity reuse coefficient is a value equal to or greater than the number of overlapping signals and equal to or smaller than the number of available diversity resources. delete delete delete delete In the system of the available diversity resource allocation device to set the transmission signal delay value for each repeater in a system in which at least one repeater is wired to extend the service range of the base station, Collecting the multipath time between the base station and the relay period and the guard interval length in an OFDM symbol; A signal arrival time offset value is selected in consideration of the collected multipath time, physical characteristics of a channel, and hardware implementation characteristics, and a value obtained by dividing the collected guard interval length by the selected offset value is set to the number of available diversity resources. Making; Allocating available diversity resources corresponding to the set number so as not to be overlapped by adjacent base stations or repeaters; and Setting a transmission signal delay value for each repeater using a maximum propagation delay time between the base station and each repeating period and providing the relay signal with a corresponding repeater; Transmission signal delay value setting method for each repeater for extending the service range of the base station comprising a. The method of claim 13, The step of allocating the available diversity resources corresponding to the set number so as not to overlap with an adjacent base station or repeater, Setting a diversity reuse coefficient in an area where the transmission signals overlap; And allocating the available diversity resources corresponding to the set number without overlapping by adjacent base stations or repeaters based on the set diversity reuse coefficient. How to set the signal delay value.

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