KR101472101B1 - Terminal unit, method for estimating uplink channel and communication system - Google Patents

Terminal unit, method for estimating uplink channel and communication system Download PDF

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KR101472101B1
KR101472101B1 KR1020120100066A KR20120100066A KR101472101B1 KR 101472101 B1 KR101472101 B1 KR 101472101B1 KR 1020120100066 A KR1020120100066 A KR 1020120100066A KR 20120100066 A KR20120100066 A KR 20120100066A KR 101472101 B1 KR101472101 B1 KR 101472101B1
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South Korea
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base station
random access
uplink channel
access channel
preamble
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KR1020120100066A
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Korean (ko)
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KR20140033773A (en
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박규진
이경준
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주식회사 케이티
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Priority to PCT/KR2012/011049 priority patent/WO2014038754A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

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  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

A terminal, an uplink channel estimation method, and a communication system. The UE includes an uplink channel manager for generating a physical random access channel preamble according to random access channel resource setting information allocated from a serving base station; And a communication unit for transmitting the physical random access channel preamble to a neighbor base station in response to a request from the uplink channel management unit. The physical random access channel preamble is used for estimating an uplink channel by the neighbor base station.

Description

TECHNICAL FIELD [0001] The present invention relates to a terminal, an uplink channel estimation method,

The present invention relates to a terminal, an uplink channel estimation method, and a communication system.

Due to the introduction of MTC (Machine Type Communication) and the spread of smart phones, the number of terminals requiring wireless connection is increasing rapidly. As a result, there is a growing demand for supporting a high data rate for each terminal. In this environment, in order to efficiently manage the allocated radio resources and to support the high data rate, the wireless service providers divide the base station into a digital unit (DU) and a radio unit (RU), and each RU forms an independent cell, In order to maximize.

In addition, a heterogeneous network (Het-Net) scenario in which the cell size covered by each RU is varied due to transmission power imbalance between RUs is becoming common.

In the heterogeneous network, various cooperative communication techniques between RUs for ensuring a high data rate for a UE located in a cell boundary region and independent uplink / downlink path establishment due to unbalanced uplink / downlink (i.e., An RU as a TP (Transmission Point) for transmitting a downlink signal and an RU as an RP (Reception Point) for receiving an uplink signal from the corresponding terminal are independently set).

However, in order to apply the evolved cooperative communication scheme, it is basically necessary to measure an uplink channel from a serving base station connected to an arbitrary terminal, as well as a measure of an uplink channel with the base station adjacent to the corresponding terminal.

In particular, a cooperative communication scheme between adjacent base stations has been proposed in a CoMP scenario in order to increase the uplink and downlink data rates of a UE located in a cell boundary region. In this case, in the case of a UE located in a cell boundary region, an uplink channel estimation scheme with neighboring base stations is required for cooperative communication.

In the current 3GPP LTE / LTE-A system, an arbitrary UE periodically or non-periodically transmits a Sounding Reference Signal (UL) signal for uplink channel state measurement for uplink channel estimation with a base station , SRS). Generally, in the case of the sounding reference signal (SRS) for measuring the uplink channel state, the RRC parameters transmitted from the serving BS to the serving BS are transmitted from the serving BS to the corresponding serving BS. The RRC parameters include cell-specific SRS subframe and SRS bandwidth, UE-specific SRS bandwidth, hopping patter, frequency domain position, periodicity, subframe configuration, antenna configuration, base sequence index and cyclic shift index. The UE transmits a sounding reference signal (SRS) according to a UE-specific parameter in an uplink subframe / bandwidth region satisfying a cell-specific parameter.

Accordingly, a method has been proposed in which the transmission of a sounding reference signal (SRS) of a UE located in a cell boundary region is performed not only by the serving BS but also by the neighbor BS, thereby enabling measurement of the uplink channel between the UE and the neighboring cell. In other words, there is a need to measure uplink channels with multiple base stations for cooperative communication, and a method has been proposed in which sounding reference signal (SRS) setup information is shared with neighboring base stations so that neighboring base stations can receive them.

However, since the conventional sounding reference signal SRS is generated on the basis of the physical cell ID of the base station to which the mobile station belongs, the neighboring base station having a different physical cell identifier receives a sounding reference signal (SRS) signal Is impossible. Also, when the cell size between adjacent cells is different in the heterogeneous network, it is also unclear whether the uplink signal of the UE having the TA value set based on the reception timing at the serving base station is synchronized with the adjacent base station.

Since the SRS setup information is determined by the parameters of the serving base station, even if the SRS setup information is shared with the neighbor base station, in order for the neighbor base station to receive the SRS, At least two of the following conditions must be satisfied.

1) Use the same cell ID between serving cell and neighbor cell (CoMP scenario 4)

2) The same uplink synchronization can be applied between the serving cell and adjacent cells in the cell boundary region.

As described above, the conventional SRS transmission scheme considering only the uplink channel estimation with a single base station can be considered as a sufficient uplink (uplink) scheme for supporting various cooperative communication schemes in a CoMP scenario and a Heterogeneous Network Channel estimation results are not provided. Also, since the application range of the uplink channel estimation method with a plurality of base stations limited to the limited scenario becomes narrow, it is necessary to design a plurality of uplink channel estimation techniques applicable to various cell deployment scenarios It is true.

SUMMARY OF THE INVENTION The present invention provides a terminal, an uplink channel estimation method, and a communication system for estimating a multi-uplink channel between a terminal and a plurality of base stations based on a random access channel (RACH).

According to an aspect of the present invention, a UE includes an uplink channel manager for generating a physical random access channel preamble according to random access channel resource setting information allocated from a serving base station; And a communication unit for transmitting the physical random access channel preamble to a neighbor base station in response to a request from the uplink channel management unit,

The physical random access channel preamble is used by the neighbor base station to estimate the uplink channel.

At this time,

And transmitting the physical random access channel preamble to the serving base station in response to a request from the uplink channel manager,

The physical random access channel preamble may be used by the serving base station to estimate the uplink channel.

Also, the uplink channel management unit may include:

And may request the communication unit to transmit the physical random access channel preamble periodically or non-periodically a plurality of times.

Also, the uplink channel management unit may include:

And may obtain the allocated random access channel resource setting information from the physical downlink control channel command received according to the random access procedure instruction from the serving base station.

In addition, the allocated random access channel resource setting information may include:

A preamble index, a physical random access channel resource index, and a physical random access channel mask index,

The uplink channel management unit includes:

Sets the physical random access channel preamble generated using the preamble index through a preamble index information area of a physical downlink control channel command according to physical random access channel configuration information, To the neighbor base station through the physical random access channel resource index set through the physical random access channel resource index.

Also, the uplink channel management unit may include:

And receive the physical random access channel configuration information through the cell specific system information of the serving base station.

Also, the uplink channel management unit may include:

The mobile station can acquire the allocated random access channel resource setting information from the mobility control information area of the received RBAC reconnection message according to a Fake Handover instruction from the serving base station.

In addition, the radio resource control connection re-

System information of the neighbor base station and the allocated random access channel resource setting information,

The random access channel resource setting information,

A preamble index, a preamble mask index, timer information, and maximum number of times of preamble transmission.

In addition, when the UE receives the RRC connection reconfiguration message including the allocated Random Access Channel resource configuration information, the UE requests the uplink channel management unit to generate and transmit the physical random access channel preamble, And a handover control unit for performing network re-entry through selection of an optimal cell when the timer according to the information expires.

The UE also requests the uplink channel manager to generate and transmit the physical random access channel preamble when the radio resource control access reconfiguration message including the allocated random access channel resource configuration information is received, And a handover controller for performing network re-entry through selection of an optimal cell if the number of transmissions of the random access channel preamble satisfies the preamble transmission maximum number information.

Also, the uplink channel management unit may include:

And receive a radio resource control signaling (RRC Signaling) message including the allocated random access channel resource configuration information from the serving base station.

Also, the uplink channel management unit may include:

The physical random access channel preamble may be transmitted to the neighbor base station through a resource area of a physical uplink shared channel of the neighbor base station.

Also, the uplink channel management unit may include:

And may transmit the physical random access channel preamble to the neighbor base station through a physical random access channel opportunity (PRACH opportunity) of the neighbor base station.

Also, the UE transmits a result of the downlink channel estimation to the serving BS periodically or non-periodically to the serving BS, and if the result of the downlink channel estimation satisfies the predefined threshold condition, And a downlink channel manager for transmitting a result of the downlink channel estimation to the neighbor base station to the neighbor base station.

According to another aspect of the present invention, an uplink channel estimation method is a method in which a base station control apparatus for controlling and managing a plurality of base stations estimates an uplink channel, Receiving an uplink channel estimation result between the UE and the neighbor BS using the random access channel preamble; And performing multi-uplink channel estimation for inter-cell cooperative communication using the uplink channel estimation result between the terminal and the adjacent base station.

In this case, the uplink channel estimation method may further include receiving an uplink channel estimation result between the serving base station and the mobile station using the random access channel preamble from the serving base station,

Wherein performing multi-uplink channel estimation comprises:

And performing multi-uplink channel estimation between the mobile station and a plurality of base stations based on uplink channel estimation results received from the serving base station and the neighboring base stations.

The step of performing the multi-uplink channel estimation may include:

Determining whether the UE is located in an area requiring inter-cell downlink cooperative communication, and determining whether to implement inter-cell downlink cooperative communication.

The step of performing the multi-uplink channel estimation may include:

And determining whether the terminal is handed over.

The step of performing the multi-uplink channel estimation may include:

And determining whether to perform uplink path reestablishment of the terminal transmitting the uplink to the neighboring base station while maintaining the downlink with the serving base station.

Also, before receiving the uplink channel estimation result between the UE and the neighbor BS,

Determining a target terminal requiring multi-uplink channel estimation; And instructing a serving base station connected to the target terminal to perform multi-uplink channel estimation.

In addition,

Receiving a downlink channel estimation result between the mobile station and the serving base station from the serving base station; And determining the target terminal based on the downlink channel estimation result.

In addition,

Receiving a downlink channel estimation result between the serving base station and the serving base station from the serving base station; Receiving a downlink channel estimation result between the neighbor base station and a neighbor base station requiring handover from the neighbor base station; And determining the target terminal based on the downlink channel estimation result between the serving base station and the neighbor base station.

In addition,

Receiving a cell interference signal in a specific frequency band from the neighbor base station; And determining the terminal scheduled as the target terminal in the specific frequency band in which the cell interference signal is generated.

According to another aspect of the present invention, a communication system includes a serving base station allocating a random access channel resource for uplink channel estimation to a terminal located in a cell boundary region; A physical random access channel preamble generated according to the random access channel resource allocated by the serving base station from the terminal and estimating an uplink channel with the terminal using the physical random access channel preamble; ; And a base station controller for receiving a result of estimating an uplink channel with the terminal from the neighbor base station and estimating a multi-uplink channel for inter-cell cooperative communication.

At this time,

And transmitting a result of estimating an uplink channel with the MS to the BS controller using the physical random access channel preamble received from the MS,

The base station control apparatus includes:

And perform multi-uplink channel estimation between the mobile station and a plurality of base stations based on uplink channel estimation results received from the serving base station and the adjacent base stations.

In addition, the serving base station and the neighbor base station,

And can be connected to the same base station controller or different base station controllers.

Also, the serving base station and the neighbor base station are radio signal processing devices forming respective independent cells, and the base station control device is connected to the serving base station and the neighbor base station to perform a base station control management function, And a cloud-based base station structure implemented as a concentrated virtual server.

In addition, the serving base station and the neighbor base station,

And each cell included in the inter-cell cooperative communication group for the terminal located in the cell boundary region can be formed.

In addition, a heterogeneous network in which the serving base station and the neighbor base station having cell coverage of different sizes are arranged in an overlapping manner can be formed.

In addition, the serving base station and the neighbor base station,

A macro cell and a plurality of small cells each having a cell radius smaller than that of the macro cell can be formed in the macro cell.

According to an embodiment of the present invention, a physical random access channel sequence (PRACH sequence) is used as a form of a reference signal for measuring an uplink channel state with an adjacent cell as well as an uplink channel with a serving cell connected to the terminal Thereby enabling multi-uplink channel estimation that is applicable to various heterogeneous networks (Het-Net) and CoMP scenarios.

Therefore, based on the uplink channel estimation result measured by the plurality of base stations, it is possible to provide a basis for determining whether or not the mobile terminal enters the cooperative communication area (cell boundary area). In addition, it is possible to provide an independent path setting scheme between the uplink and the downlink, in particular, a basis for providing a base channel estimation result for determining whether the uplink path is reset.

1 is a network configuration diagram to which an embodiment of the present invention is applied.
2 illustrates a cloud-based base station structure to which an embodiment of the present invention is applied.
3 is a block diagram illustrating a schematic configuration of a serving BS according to an embodiment of the present invention.
4 is a block diagram showing a schematic configuration of a neighbor base station according to an embodiment of the present invention.
5 is a block diagram showing a schematic configuration of a base station control apparatus according to an embodiment of the present invention.
6 is a block diagram showing a schematic configuration of a terminal according to an embodiment of the present invention.
7 is a flowchart illustrating an uplink channel estimation method according to an embodiment of the present invention.
8 is a flowchart illustrating an uplink channel estimation method according to another embodiment of the present invention.
9 is a flowchart illustrating an uplink channel estimation method according to another embodiment of the present invention.
10 is a flowchart illustrating a method of determining a target terminal according to an exemplary embodiment of the present invention.
11 is a flowchart illustrating a method of determining a target terminal according to another embodiment of the present invention.
12 is a flowchart illustrating a method of determining a target terminal according to another embodiment of the present invention.

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

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

Also, the terms " part, "" module," and " module ", etc. in the specification mean a unit for processing at least one function or operation and may be implemented by hardware or software or a combination of hardware and software have.

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

In this specification, a base station (BS) includes an access point (AP), a radio access station (RAS), a node B, an evolved NodeB (eNodeB) A base station (BTS), a mobile multihop relay (MMR) -BS, or the like, and may perform all or a part of functions of an access point, a radio access station, a Node B, an eNodeB, a base transceiver station, .

In the present invention, not only the downlink cooperation communication but also the independent uplink and downlink path establishment schemes will be referred to as cooperative communication for convenience of explanation.

Now, a terminal, an uplink channel estimation method, and a communication system according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram of a communication system to which an embodiment of the present invention is applied, FIG. 2 shows a cloud-based base station structure to which an embodiment of the present invention is applied, FIG. 3 is a schematic FIG. 4 is a block diagram illustrating a schematic configuration of a neighbor base station according to an embodiment of the present invention, FIG. 5 is a block diagram illustrating a schematic configuration of a base station control apparatus according to an embodiment of the present invention And FIG. 6 is a block diagram showing a schematic configuration of a terminal according to an embodiment of the present invention.

Here, FIG. 3 to FIG. 6 show only the configuration related to the embodiment of the present invention.

Referring to FIG. 1, a communication system to which an embodiment of the present invention is applied includes a first base station 100 having cell coverage of different sizes, and a second base station 200, It is a heterogeneous network (Het-Net). Here, although only two base stations are illustrated, they may include a plurality of base stations.

In this heterogeneous network, a macro cell 300 serving as a service area of the first base station 100 and a small cell 400 serving as a service area of the second base station 200 are overlapped. The small cell 400 covers an area smaller than the macro cell 300. A plurality of small cells 400 may exist in one macro cell 300. In other words, a small cell 400 such as a pico cell, a micro cell, and a femtocell is formed by overlapping low power RRH (Remote Radio Heads) Respectively.

In addition, a communication system to which an embodiment of the present invention is applied includes a CoMP scenario (Coordinated Multi- Point-to-Multipoint) scenario in which uplink and downlink data rates of a UE located in a cell boundary region are increased through cooperative communication between adjacent cells. Point scenario 3 and 4, which are shown in FIG.

Referring to FIG. 2, a cloud-based base station structure is divided into a general base station (DU) 800 and a radio signal processing unit (RU) 900. A typical base station includes a processing unit corresponding to each of the digital signal processing apparatus 800 and the radio signal processing apparatus 900 in one physical system, and one physical system is installed in the service area. On the other hand, according to the cloud-based base station structure, the digital signal processing device 800 and the wireless signal processing device 900 are physically separated and only the wireless signal processing device 900 is installed in the service area. And a digital signal processing apparatus 800 has a control management function for a plurality of radio signal processing apparatuses 900 forming respective independent cells. At this time, the digital signal processing apparatus 800 and the wireless signal processing apparatus 900 can be connected by an optical cable.

Here, the digital signal processing apparatus 800 is a part that performs digital signal processing and resource management control functions of the base station and is connected to a core system (not shown). It is installed in centralized areas such as Internet Data Center (IDC, Internet Data Center). In addition, the digital signal processing apparatus 800 can transmit various wireless technologies such as Wideband Code Division Multiple Access (WCDMA), Wireless Broadband Internet (WiBro) and Long Term Evolution (LTE) 800, so that a plurality of digital signal processing apparatuses 800 may be operated as one.

The radio signal processing apparatus 900 is a part for amplifying a radio wave signal in the radio signal processing section of the base station and radiating it to an antenna. That is, the radio signal processing apparatus 900 converts a digital signal received from the digital signal processing apparatus 800 into a radio frequency (RF) signal according to a frequency band and amplifies the signal.

Referring again to FIG. 1, the first base station 100 and the second base station 200 are implemented in the radio signal processing apparatus 900 of FIG. And can be referred to as eNB, RU, and RRH (Remote Radio Heads). In addition, the base station control apparatus 500 is implemented by the digital signal processing apparatus 800 of FIG. And is connected to and manages the first base station 100 and the second base station 200.

Although the first base station 100 and the second base station 200 are managed by the single base station controller 500, the first base station 100 and the second base station 200 may be controlled by different base station controllers Or may be managed by the device 500, respectively.

According to the cooperative multi-point (CoMP) scenario, the terminal 600 located in the cell boundary region is requested to estimate the uplink channel with the neighbor base station 200.

Here, the terminal 600 located in the cell boundary region is defined as a terminal located in the first cell 300 but located in an area that can be influenced by the second cell 400. The terminal 600 located in the cell boundary region transmits and receives signals not only to the currently connected first base station 100 but also to the second base station 200 as compared with the case where the terminal 700 located at the center of the second cell 400 transmits / And can also transmit and receive signals to and from the second base station 200, which is an adjacent base station.

Hereinafter, the first base station 100 will be referred to as a serving base station and the second base station 200 will be referred to as a neighbor base station based on the terminal 600 located in the cell boundary region.

A terminal 600 located in a cell boundary region receives a downlink physical channel and a physical signal from the serving base station 100 (1). Here, the downlink physical channel includes a Physical Downlink Shared Channel (PDSCH), a Physical Downlink Control Channel (PDCCH), and a Physical Broadcast Channel (PBCH). The physical signals include a CRS (Common Reference Signal), a PSS (Primary Synchronization Signal), a SSS (Secondary Synchronization Signal), a CSI RS (Channel State Information-Reference Signal) and a DM RS (DeModulation-Reference Signal).

The MS 600 located in the cell boundary region may determine the uplink physical channel state between the MS 600 and the serving BS 100 and the uplink physical channel state between the MS 600 and the second BS 200, Channel and physical signals to the serving base station 100 or to the second base station 200 (2). Here, the uplink physical channel includes a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), and a physical random access channel (PRACH), and the physical signal includes a sounding reference signal (SRS).

Here, the UE 600 located in the cell boundary region receives the Dedicated Physical Random Access Channel (DPCH) resource setting signal from the serving base station 100. The demodulated physical random access channel resource setup signal includes resource allocation information for uplink channel estimation with a neighboring cell. Then, the serving base station 100 transmits a demodulated physical random access channel resource setting signal to the target terminal, which is a target of multi-uplink estimation, according to an instruction from the base station controller 500.

Here, the target terminal is a multi-uplink estimation target terminal determined by the base station control apparatus 500, and eventually becomes the terminal 600 located in the cell boundary region. At this time, the multi-uplink channel estimation is defined as an uplink channel estimation between the target terminal 600 and two or more base stations.

Meanwhile, the UE 600 transmits a physical random access channel preamble (PRACH preamble) to the neighbor base station 200 according to a Dedicated Physical Random Access Channel resource setting signal. Then, the neighbor base station 200 estimates the uplink channel state with the terminal 600 based on the physical random access channel preamble, and reports the state to the base station controller 500.

Also, the UE 600 transmits a physical random access channel preamble (PRACH preamble) to the serving base station 100 according to a demodulated physical random access channel resource setting signal. Similarly, the serving base station 100 estimates the uplink channel state with the terminal 600 based on the physical random access channel preamble, and reports the state to the base station controller 500.

Then, the base station controller 500 performs multi-uplink channel estimation based on the respective uplink channel states reported from the serving base station 100 and the neighbor base station 200. That is, the uplink channel with the serving base station 100 to which the terminal 600 is currently connected, as well as the uplink channel with the neighbor base station 200, It is possible to determine whether to implement inter-cell downlink cooperative communication. Alternatively, handover of the terminal 600 can be implemented. Or UL path redirection of the terminal 600. [0064] Herein, the uplink path reestablishment refers to a state in which the downlink is maintained with the serving base station 100 and only the uplink is transmitted to the neighbor base station 200.

The outline of the configuration of the serving base station 100, the neighbor base station 200, the base station control device 500, and the terminal 600 will now be described.

3, the serving BS 100 includes a communication unit 110, a memory 130, and a processor 150.

Here, the communication unit 110 is connected to the processor 150 to transmit and receive a radio signal. The communication unit 110 may include a baseband circuit for processing a radio signal. The memory 130 is coupled to the processor 150 and stores various information for driving the processor 150. The memory 130 may be implemented as a medium such as a dynamic random access memory, a RAM such as a DRAM, a synchronous DRAM, or a static RAM. And memory 130 may be internal or external to processor 150 and may be coupled to processor 150 in a variety of well known ways.

The processor 150 may be implemented as a central processing unit (CPU) or other chipset, a microprocessor, etc., and the layers of the air interface protocol may be implemented by the processor 150. The processor 150 includes an allocating unit 251, an estimating unit 253, and a reporting unit 255.

The allocating unit 251 allocates a resource for uplink channel estimation between the terminal 600 and the neighboring cell 400 according to an instruction from the base station controller 500 and transmits a decoded physical random access channel resource setting signal And transmits it to the terminal 600.

The estimator 253 receives the physical random access channel preamble according to the demodulated physical random access channel resource setting signal from the terminal 600 and estimates the uplink channel state with the terminal 600. [

The reporting unit 255 receives the uplink channel estimation result from the estimation unit 253 and transmits the uplink channel estimation result to the base station controller 500.

4, the neighbor base station 200 includes a communication unit 210, a memory 230, and a processor 250. [

Here, the communication unit 210 is connected to the processor 250 to transmit and receive a radio signal. The communication unit 210 may include a baseband circuit for processing a radio signal. The memory 230 is coupled to the processor 250 and stores various information for driving the processor 250. Such memory 230 may be implemented in a medium such as RAM, such as dynamic random access memory, Rambus DRAM, synchronous DRAM, static RAM, and the like. And memory 230 may be internal or external to processor 250 and may be coupled to processor 250 in a variety of well known ways.

The processor 250 may be implemented as a central processing unit or other chipset, microprocessor, etc., and the layers of the air interface protocol may be implemented by the processor 250. The processor 250 includes a channel estimation unit 251, a cell interference measurement unit 253, and a reporting unit 255.

Here, the channel estimator 251 receives the physical random access channel preamble according to the demodulated physical random access channel resource setting signal from the terminal 600, and estimates the uplink channel state with the terminal 600.

The cell interference measuring unit 253 measures an interference signal due to neighboring cells. That is, through the backhaul network, a strong interference signal is measured according to a predefined criterion in a specific UL band.

The reporting unit 255 transmits the uplink channel estimation result received from the channel estimator 251 to the base station controller 500. And transmits the cell interference signal received from the cell interference measuring unit 253 to the base station controller 500.

5, the base station control apparatus 500 includes a communication unit 510, a memory 530, and a processor 550. [

Here, the communication unit 510 is connected to the processor 550 to transmit and receive a radio signal. The communication unit 510 may include a baseband circuit for processing a radio signal. The memory 530 is coupled to the processor 550 and stores various information for driving the processor 550. [ Such memory 530 may be implemented in a medium such as a dynamic random access memory, a RAM such as a Rambus DRAM, a synchronous DRAM, a static RAM, and the like. And memory 530 may be internal or external to processor 550 and may be coupled to processor 550 in a variety of well known ways.

The processor 550 may be implemented as a central processing unit or other chipset, microprocessor, etc., and the layers of the air interface protocol may be implemented by the processor 550. The processor 550 includes a target determination unit 551, an instruction unit 553, and a processing unit 555.

The target determining unit 551 determines a target terminal that requires a multi-uplink channel measurement indication.

At this time, the target determining unit 551 can determine the target terminal based on the measurement report. Generally, in a cellular system, in order to maximize frequency efficiency, a UE 600 periodically or non-periodically transmits a channel estimation result for a downlink channel through a PUCCH, which is an uplink control channel, to a channel quality indicator (CQI, Channel Quality Information) or channel state information (CSI, Channel State Information). In addition, if the downlink channel estimation result with the serving cell 300 becomes less than a predefined threshold value in order to support the handover according to the movement of the terminal 600, the terminal 600 Is defined to transmit the downlink channel estimation result for the neighboring cell 400 as well as the currently connected serving cell 300 through the PUSCH in the form of a measurement report RRC signaling.

Therefore, the target determining unit 551 determines whether the multi-up based on the downlink channel estimation result received through the channel quality indicator (CQI) or channel state information (CSI) reporting through the PUCCH or the measurement report AAL signaling through the PUSCH It is possible to determine the terminal 600 requiring the link channel estimation.

Also, the target determining unit 551 may determine the target terminal based on the neighbor base station request. That is, the multi-uplink channel estimation can be determined for the UE 600 scheduled in the uplink band where the cell interference is measured by receiving the cell interference signal from the neighbor base station 200.

The instruction unit 553 instructs the serving base station 100 and the neighboring base station 200 to perform multi-uplink channel estimation.

The processing unit 555 receives the uplink channel estimation results of the serving base station 100 and the neighbor base station 200 with the terminal 600 to perform multi-uplink channel estimation. That is, the uplink channel estimation result is compared and analyzed to determine whether the inter-cell downlink cooperative communication is implemented, whether the terminal 600 is handed over, and whether the uplink path reestablishment of the terminal 600 is implemented.

6, the terminal 600 includes a communication unit 610, a memory 630, and a processor 650. [

Here, the communication unit 610 is connected to the processor 650 to transmit and receive a radio signal. The communication unit 610 may include a baseband circuit for processing a radio signal. The memory 630 is coupled to the processor 650 and stores various information for driving the processor 650. [ Such memory 630 may be implemented in a medium such as a dynamic random access memory, a RAM such as a Rambus DRAM, a synchronous DRAM, a static RAM, and the like. And memory 630 may be internal or external to processor 650 and may be coupled to processor 650 by various well known means.

The processor 650 may be implemented as a central processing unit or other chipset, microprocessor, etc., and the layers of the air interface protocol may be implemented by the processor 650. [ The processor 650 includes an uplink channel management unit 651, a downlink channel management unit 653, and a handover control unit 655.

The uplink channel manager 651 generates a physical random access channel preamble according to the Dedicated Physical Random Access Channel resource setup signal received from the serving base station 100 and transmits the physical random access channel preamble to the serving base station 100 and the neighbor base station 200 do.

The downlink channel manager 653 periodically or non-periodically measures the downlink channel with the serving base station 100 and transmits the measured downlink channel to the serving base station 100. At this time, if the downlink channel estimation result is less than or equal to the predefined reference value, the downlink channel estimation result can be reported to the serving base station 100.

The downlink channel manager 653 estimates a downlink channel with the neighbor base station 200 and transmits the downlink channel to the neighbor base station 200.

The handover controller 655 performs a best cell selection according to a radio link failure procedure.

The method for estimating the uplink channel will be described with reference to the embodiments described above. Here, the description will be made in connection with the configurations of Figs. 1 to 6, and the same reference numerals are used.

7 is a flowchart illustrating an uplink channel estimation method according to an embodiment of the present invention.

Referring to FIG. 7, the target determining unit 551 of the base station control apparatus 500 determines a target terminal 600 requiring multi-uplink channel estimation (S101).

Here, the target terminal 600 may be a terminal located in a boundary region between two or more base stations managed by the base station control apparatus 500 itself. Or a terminal located in a boundary area between the base station control apparatus 500 itself and two or more base stations managed by another base station control apparatus.

Next, the instruction unit 553 of the base station control apparatus 500 transmits a multi-uplink channel estimation instruction (Initiation of multi) to the serving base station 100 and the neighbor base station 200 to which the target terminal 600 determined in step S101 is currently connected -UL channel measurement) (S103, S105).

Next, the allocation unit 151 of the serving base station 100 instructs a random access procedure by transmitting a physical downlink control channel (PDCCH) order to the target terminal 600 (S107).

At this time, the physical downlink control channel command (PDCCH order) includes physical random access channel (PRACH) resource allocation information, and the format is PDCCH format 1A. Here, the PDCCH format 1A is scrambled into a cell radio network temporary identifier (C-RNTI) of the target terminal 600.

The physical random access channel (PRACH) resource allocation information includes a preamble index (6 bits) for generating a dedicated PRACH preamble and a physical random access And a physical random access channel mask index (PRACH Mask Index, 4 bits), which is a value of a channel resource index (PRACH resource index).

Next, the uplink channel management unit 651 of the target terminal 600 transmits a dedicated PRACH preamble generated according to the physical random access channel (PRACH) resource allocation information received in step S107 To the adjacent base station 200 (S109).

At this time, the uplink channel manager 651 of the target terminal 600 transmits a preamble index information field of a physical downlink control channel (PDCCH) order according to the physical random access channel configuration information (PRACH configuration) And transmits the set preamble through a physical random access channel resource index (PRACH resource index) set through a physical random access channel mask index (PRACH Mask Index).

Here, the physical random access channel configuration (PRACH configuration) information is received through the cell-specific system information of the serving base station 100. The physical random access channel configuration information includes a physical random access channel configuration index (PRACH configuration index), a physical random access channel-frequency offset (PRACH-Frequency offset), and a random access channel-root sequence (RACH_ROOT_SEQUENCE) .

Next, the channel estimation unit 251 of the neighbor base station 200 estimates the uplink channel state with the target terminal 600 using the dedicated PRACH preamble (step S109) (S111). The reporting unit 255 of the neighboring base station 200 reports the estimation result to the base station controller 500 (S113).

As described above, the base station control apparatus 500 uses a dedicated PRACH preamble generated according to the dedicated PRACH resource information allocated by the serving base station 100, which is a Dedicated Physical Random Access Channel And obtain the uplink channel estimation result between the neighbor base station 200 and the target terminal 600 from the neighbor base station 200. [

In addition, the uplink channel manager 651 of the target terminal 600 generates a dedicated physical random access channel preamble (DPCM) generated according to the dedicated DPCCH resource allocation information received in step S107 PRACH preamble to the serving base station 100 (S115).

Then, the estimator 153 of the serving base station 100 estimates the uplink channel state with the target terminal 600 using the dedicated PRACH preamble (D11) received in step S115 (S117). The reporting unit 155 of the serving base station 100 reports the estimation result to the base station controller 500 (S119).

Then, the processing unit 555 of the base station control apparatus 500 estimates the multi-uplink channel between the target terminal 600 and the plurality of base stations based on the estimation result received in steps S113 and S119 (S121).

The processing unit 555 of the base station control apparatus 500 compares and analyzes the uplink channel estimation result between the serving base station 100 and the neighbor base station 200 and the terminal 600 received in steps S113 and S119, Whether or not downlink cooperation communication is implemented, whether the terminal 600 is handed over, and whether the uplink path reestablishment of the terminal 600 is implemented.

As described above, according to the steps S101 to S121, the target terminal 600 is controlled using a random access procedure based on a physical downlink control channel (PDCCH) order defined in the 3GPP LTE / LTE-A system Decoded physical random access channel preamble, and allows the adjacent base station 200 to receive the dedicated PRACH preamble.

At this time, the physical random access channel configuration (PRACH configuration) information and the physical downlink control channel order (PDCCH order) are values set in the serving base station 100 to which the target terminal 600 is currently connected. Therefore, the neighbor base station 200 transmits the cell-specific PRACH configuration information of the serving base station 100 to the target terminal 600 through the physical downlink control channel (PDCCH) It is necessary to know the preamble index and the physical random access channel mask index value and acquire it through the base station controller 500 or transmit the PRACH mask index to the neighbor base station 200 .

8 is a flowchart illustrating an uplink channel estimation method according to another embodiment of the present invention.

Referring to FIG. 8, the target determining unit 551 of the base station control apparatus 500 determines a target terminal 600 requiring multi-uplink channel estimation (S201).

The instruction unit 553 of the next base station control apparatus 500 transmits a multi-uplink channel estimation instruction to the serving base station 100 and the neighboring base station 200 to which the target terminal 600 determined in step S201 is currently connected , S205).

Next, the assigning unit 151 of the serving base station 100 instructs the target terminal 600 to perform a fake handover using radio resource control (RRC) signaling (S207).

At this time, a FEC handover is instructed using a RRC Connection Reconfiguration (RRC) reconnection message transmitted by the serving BS 100 in the conventional handover.

In addition, the assigning unit 151 of the serving BS 100 may include a physical random access channel configuration (PRACH configuration) information through the mobility control information region of the RRC Connection Reconfiguration message (PRACH) resource allocation information for generating the system information of the neighbor base station 200 and the dedicated PRACH preamble (Dedicated Physical Random Access Channel). Here, the physical random access channel (PRACH) resource allocation information includes a preamble index, a preamble mask index, a T304 timer setting information, a preamble TransMax, .

Next, the handover control unit 655 of the target terminal 600 performs a handover operation upon receiving a RRC Connection Reconfiguration message in step S207.

At this time, because the physical random access channel (PRACH) resource allocation information is included in the mobility control information area of the RRC Connection Reconfiguration message, the uplink channel management unit 651 generates a dedicated PRACH preamble according to the physical random access channel (PRACH) resource allocation information and transmits the preamble to the adjacent base station 200 (S209).

Next, the neighbor base station 200 estimates the uplink channel state with the target terminal 600 using the dedicated PRACH preamble received in step S209 (step S211). Then, the estimation result is reported to the base station control apparatus 500 (S213).

Also, the target terminal 600 generates a dedicated PRACH preamble according to the physical random access channel (PRACH) resource allocation information received in step S207, and transmits the dedicated PRACH preamble to the serving base station 100 (S215).

In step S217, the serving base station 100 estimates the uplink channel state with the target terminal 600 using the dedicated PRACH preamble received in step S215. Then, the estimation result is reported to the base station control apparatus 500 (S219).

In this way, the instruction unit 153 of the serving base station 100 transmits the RRC Connection Reconfiguration message in the mobility control information region of the RRC Connection Reconfiguration message in the fake handover scheme, A dedicated PRACH preamble transmission is instructed.

At this time, neither the serving base station 100 nor the neighboring base station 200 transmits any response message for the physical random access channel preamble transmission of the target terminal 600.

Meanwhile, the processing unit 555 of the base station control apparatus 500 estimates the multi-uplink channel between the target terminal 600 and the plurality of base stations based on the estimation result received in steps S213 and S219 (S221).

Thereafter, the handover control unit 655 of the target terminal 600 determines whether the conditions set in the RRC Connection Reconfiguration message are satisfied (S223). For example, whether the T304 timer expires according to the T304 timer value. Or whether the number of times of transmission of the dedicated PRACH preamble reaches a preamble Trans Max value.

Next, the handover control unit 655 of the target terminal 600 performs optimal cell selection (S225) according to a radio link failure procedure when the condition is satisfied in step S223, Re-enter the network.

At this time, since the handover controller 655 of the target terminal 600 is located in the downlink coverage of the serving base station 100, the handover controller 655 re-enters the cell of the serving base station 100 (S227).

9 is a flowchart illustrating an uplink channel estimation method according to another embodiment of the present invention.

Referring to FIG. 9, the target determining unit 551 of the base station control apparatus 500 determines a target terminal 600 requiring multi-uplink channel estimation (S301).

Next, the instruction unit 553 of the base station control apparatus 500 transmits a multi-uplink channel estimation instruction to the serving base station 100 and the neighbor base station 200 to which the target terminal 600 determined in step S301 is currently connected S303, S305).

Next, the allocation unit 151 of the serving base station 100 transmits a radio resource control signaling (RRC Signaling) message including physical random access channel (PRACH) resource allocation information to the target terminal 600 (S307).

Then, the uplink channel manager 651 of the target terminal 600 transmits a dedicated PRACH preamble generated according to the physical random access channel (PRACH) resource allocation information received in step S307 To the neighbor base station 200 (S309).

Here, according to one embodiment, the dedicated PRACH preamble may be set to be transmitted through the resource area of the physical uplink shared channel (PUSCH) of the neighbor base station 200 have. At this time, the RRC Signaling message includes time / frequency resource allocation information, a random access channel-route-sequence (RACH_ROOT_SEQUENCE), a preamble format, a preamble index index, and transmission power (Tx Power). At this time, the time / frequency resource allocation information includes a physical random access channel-frequency offset (PRACH-Frequency offset), a radio frame / subframe index for initial transmission, Periodicity information, and the like.

Also, according to another embodiment, the dedicated PRACH preamble may be configured to be transmitted via the physical random access channel opportunity (PRACH opportunity) of the neighbor base station 200. At this time, the RRC Signaling message includes PRACH configuration information, a preamble index, a Preamble Mask Index, power control information, periodicity information, and the like. Here, the physical random access channel configuration information includes a physical random access channel configuration index, a physical random access channel-frequency offset (PRACH-FrequencyOffset), a random access channel-root sequence (RACH_ROOT_SEQUENCE) .

Next, the channel estimation unit 251 of the neighbor base station 200 estimates the uplink channel state with the target terminal 600 using the physical random access channel preamble (PRACH Preamble) received in step S309 (S311) . Then, the estimation result is reported to the base station controller 500 (S313).

Also, the uplink channel manager 651 of the target terminal 600 transmits a dedicated PRACH preamble generated according to the physical random access channel (PRACH) resource allocation information received in step S307 To the serving base station 100 (S315).

Then, the estimator 153 of the serving base station 100 estimates the uplink channel state with the target terminal 600 using the dedicated PRACH preamble (D3) received in step S315 (S317). Then, the estimation result is reported to the base station controller 500 (S319).

Then, the processing unit 555 of the base station control apparatus 500 estimates the multi-uplink channel between the target terminal 600 and the plurality of base stations based on the estimation result received in steps S313 and S319 (S321).

As described above, according to steps S301 to S321, the channel estimation procedure with the neighbor base station 200 is newly defined through the physical random access channel preamble (PRACH preamble) in addition to the uplink channel estimation with the serving base station 100, You can define higher layer (RRC) signaling to transmit configuration information.

7, 8, and 9, the target terminal 600 may transmit a dedicated PRACH preamble (Dedicated Physical Random Access Channel) periodically or non-periodically a plurality of times.

7, 8, and 9, a description will be made of an embodiment in which the target decision unit 551 of the base station control apparatus 500 determines a terminal requiring multi-uplink channel estimation.

10 is a flowchart illustrating a method of determining a target terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 10, the downlink channel management unit 653 of the target terminal 600 estimates the downlink channel of the currently connected serving cell (S401). The serving base station 100 periodically or non-periodically reports the estimation result on the uplink control channel (PUCCH) (S403).

Then, the reporting unit 255 of the serving base station 100 reports the estimation result received in step S403 to the base station controller 500 (step S405).

Next, in step S407, the target determining unit 551 of the base station control apparatus 500 determines whether the corresponding terminal is a terminal requiring multi-uplink channel estimation based on the downlink channel estimation result received in step S405. For example, if the downlink channel estimation value satisfies a predefined threshold condition, the terminal can be determined to be a terminal located at a cell boundary and a terminal requiring a multi-uplink channel estimation indication can be determined.

11 is a flowchart illustrating a method of determining a target terminal according to another embodiment of the present invention.

Referring to FIG. 11, the downlink channel manager 653 of the target terminal 600 estimates the downlink channel of the currently connected serving cell (S501).

At this time, it is determined whether the estimation result satisfies the predefined condition (S503). For example, it is possible to determine whether a specific situation for supporting handover according to movement of a UE, that is, a downlink channel estimation result with a serving cell is below a predetermined threshold value.

Next, if the predefined condition is satisfied, the downlink channel management unit 653 of the target terminal 600 periodically or non-periodically reports the estimation result to the serving base station 100 via the uplink control channel (PUCCH) (S505). Then, the reporting unit 155 of the serving base station 100 reports the estimation result received in step S505 to the base station controller 500 (S507).

The downlink channel management unit 653 of the target terminal 600 estimates the downlink channel of the adjacent cell in step S509 and reports the estimation result to the adjacent base station 200 in step S511. Then, the reporting unit 255 of the neighboring base station 200 reports the estimation result received in step S511 to the base station control apparatus 500 (S513).

Then, the target determining unit 551 of the base station control apparatus 500 determines whether the corresponding terminal is a terminal requiring multi-uplink channel estimation based on the downlink channel estimation result received in steps S507 and S513 (S515) .

As described above, the UE is defined to transmit the downlink channel estimation result for the neighboring cell as well as the currently connected serving cell in the form of measurement report RRC signaling.

12 is a flowchart illustrating a method of determining a target terminal according to another embodiment of the present invention.

12, a cell interference measurement unit 253 of a neighbor base station 20 measures a strong interference signal for a specific uplink band (UL band) through a backhaul network (S601) , The measurement result is reported to the base station control device 500 (S603).

Then, in step S605, the target determining unit 551 of the base station control apparatus 500 determines a terminal requiring multi-uplink channel estimation based on the measurement result of the cell interference signal reported in step S603.

Therefore, a dedicated PRACH resource can be allocated to a UE scheduled in a specific uplink band in which a cell interference signal is detected, for a multi-uplink channel estimation.

The embodiments of the present invention described above are not implemented only by the apparatus and method, but may be implemented through a program for realizing the function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded.

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

Claims (30)

An uplink channel manager for generating a physical random access channel preamble according to the random access channel resource setting information allocated from the serving base station; And
And a communication unit for transmitting the physical random access channel preamble to a neighbor base station and the serving base station in response to a request from the uplink channel management unit,
Wherein the physical random access channel preamble is used for the uplink channel estimation by the neighbor base station and the serving base station and the multi-uplink channel with a plurality of base stations according to the uplink channel state estimated by the neighbor base station and the serving base station. This estimated terminal. delete The method according to claim 1,
The uplink channel management unit includes:
And requests the communication unit to transmit the physical random access channel preamble periodically or non-periodically a plurality of times. The method according to claim 1,
The uplink channel management unit includes:
And acquires the allocated random access channel resource setting information from a physical downlink control channel command received according to a random access procedure instruction from the serving base station. 5. The method of claim 4,
The random access channel resource setting information,
A preamble index, a physical random access channel resource index, and a physical random access channel mask index,
The uplink channel management unit includes:
Sets the physical random access channel preamble generated using the preamble index through a preamble index information area of a physical downlink control channel command according to physical random access channel configuration information, To the neighbor base station through the physical random access channel resource index set through the physical random access channel resource index. 6. The method of claim 5,
The uplink channel management unit includes:
And receiving the physical random access channel configuration information through the cell specific system information of the serving base station. The method according to claim 1,
The uplink channel management unit includes:
And acquires the allocated random access channel resource configuration information from the mobility control information area of the received RRC connection reconfiguration message according to a Fake Handover instruction from the serving base station. 8. The method of claim 7,
Wherein the radio resource control connection reconfiguration message comprises:
System information of the neighbor base station and the allocated random access channel resource setting information,
The random access channel resource setting information,
A preamble index, a preamble mask index, timer information, and maximum number of times of preamble transmission. 9. The method of claim 8,
Requesting generation and transmission of the physical random access channel preamble to the uplink channel management unit when a radio resource control connection reconfiguration message including the allocated random access channel resource configuration information is received, Upon expiration, a handover control unit
Further comprising: 9. The method of claim 8,
Requesting the uplink channel manager to generate and transmit the physical random access channel preamble when the radio resource control access reconfiguration message including the allocated random access channel resource configuration information is received, When the number of transmissions of the mobile station meets the preamble transmission maximum number of times information,
Further comprising: The method according to claim 1,
The uplink channel management unit includes:
And receiving a radio resource control signaling (RRC Signaling) message including the allocated random access channel resource configuration information from the serving base station. 12. The method of claim 11,
The uplink channel management unit includes:
And transmits the physical random access channel preamble to the neighbor base station through a resource area of a physical uplink shared channel of the neighbor base station. 12. The method of claim 11,
The uplink channel management unit includes:
And transmits the physical random access channel preamble to the neighbor base station through a physical random access channel opportunity (PRACH opportunity) of the neighbor base station. The method according to claim 1,
Periodically or non-periodically transmits a result of estimating a downlink channel with the serving base station to the serving base station, and if a result of the downlink channel estimation satisfies a predefined threshold condition, And a downlink channel manager for transmitting a result of the estimation of the link channel to the neighbor base station. A method for a base station control apparatus for controlling and managing a plurality of base stations,
Receiving an uplink channel estimation result between the terminal and the neighbor base station using a random access channel preamble allocated by a serving base station connected to the terminal from a neighbor base station;
Receiving an uplink channel estimation result between the serving base station and the serving base station using the random access channel preamble from the serving base station; And
Performing multi-uplink channel estimation for inter-cell coordinated communication between the terminal and a plurality of base stations based on uplink channel estimation results received from the serving base station and the neighboring base stations,
Wherein the uplink channel estimation method comprises: delete 16. The method of claim 15,
Wherein performing multi-uplink channel estimation comprises:
Determining whether the UE is located in an area requiring inter-cell downlink cooperation communication, and determining whether to implement inter-cell downlink cooperative communication. 16. The method of claim 15,
Wherein performing multi-uplink channel estimation comprises:
And determining whether the terminal is handed over. 16. The method of claim 15,
Wherein performing multi-uplink channel estimation comprises:
And determining whether to perform uplink path re-establishment of the UE transmitting the uplink to the neighboring base station while maintaining the downlink with the serving base station. 16. The method of claim 15,
Prior to receiving the uplink channel estimation result between the UE and the neighbor BS,
Determining a target terminal requiring multi-uplink channel estimation; And
A step of instructing a serving base station connected to the target terminal to perform multi-uplink channel estimation
Further comprising the steps of: 21. The method of claim 20,
Wherein the determining comprises:
Receiving a downlink channel estimation result between the mobile station and the serving base station from the serving base station; And
Determining the target terminal based on the downlink channel estimation result
Wherein the uplink channel estimation method comprises: 21. The method of claim 20,
Wherein the determining comprises:
Receiving a downlink channel estimation result between the serving base station and the serving base station from the serving base station;
Receiving a downlink channel estimation result between the neighbor base station and a neighbor base station requiring handover from the neighbor base station; And
Determining a target terminal based on downlink channel estimation results of the serving base station and the neighbor base stations,
Wherein the uplink channel estimation method comprises: 21. The method of claim 20,
Wherein the determining comprises:
Receiving a cell interference signal in a specific frequency band from the neighbor base station; And
Determining a terminal scheduled to the specific frequency band in which the cell interference signal is generated to be the target terminal
Wherein the uplink channel estimation method comprises: Allocating a random access channel resource for uplink channel estimation to a terminal located in a cell boundary region, receiving a physical random access channel preamble generated in the terminal according to the random access channel resource from the terminal, A serving BS for estimating an uplink channel with the MS using a channel preamble;
An adjacent BS receiving the physical random access channel preamble from the MS and estimating an uplink channel with the MS using the physical random access channel preamble; And
And a base station controller for estimating a multi-uplink channel for inter-cell coordinated communication between the terminal and a plurality of base stations by receiving a result of estimating an uplink channel with the terminal from the serving base station and the neighbor base station, respectively, system. delete 25. The method of claim 24,
The serving base station and the neighbor base station,
A communication system connected to the same base station control device or a different base station control device. 25. The method of claim 24,
The serving base station and the neighbor base station are connected to the serving base station and the neighboring base station to perform a base station control management function. Based base station structure that is implemented as a virtual server. 28. The method of claim 27,
The serving base station and the neighbor base station,
Each cell included in an inter-cell cooperative communication group for a terminal located in a cell boundary region. 29. The method of claim 28,
Wherein the serving base station and the neighbor base station having cell coverage of different sizes are arranged in a superposed manner. 30. The method of claim 29,
The serving base station and the neighbor base station,
A macro cell and a plurality of small cells having a cell radius smaller than that of the macro cell in the macro cell.
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