KR20140037692A - Method for estimating downlink and uplink, base station device and communication system - Google Patents
Method for estimating downlink and uplink, base station device and communication system Download PDFInfo
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- KR20140037692A KR20140037692A KR1020120104162A KR20120104162A KR20140037692A KR 20140037692 A KR20140037692 A KR 20140037692A KR 1020120104162 A KR1020120104162 A KR 1020120104162A KR 20120104162 A KR20120104162 A KR 20120104162A KR 20140037692 A KR20140037692 A KR 20140037692A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
- H04J11/0073—Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
- H04J11/0076—Acquisition of secondary synchronisation channel, e.g. detection of cell-ID group
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/32—Hierarchical cell structures
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Abstract
Description
The present invention relates to a downlink channel estimation method, an uplink channel estimation method, a base station apparatus, and a communication system.
Due to the introduction of Machine Type Communication (MTC) and the spread of smartphones, 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.
Therefore, a discussion on the introduction of small cells as a way to accommodate the explosive increase in wireless data traffic is being carried out by the wireless mobile communication standards group centered on the 3rd Generation Partnership Project (3GPP).
The introduction of small cells has attracted much attention as a method for efficiently using limited radio resources by maximizing local radio resource recycling through cell splitting gain.
In particular, a heterogeneous network overlapping a macro cell formed by a conventional macro eNB and forming a small cell by a low power eNB / RU / RRH. (Hereinafter referred to as 'Het-Net') has been proposed as the structure of the next generation wireless mobile communication network. As such, various cooperative communication schemes for terminals located in the cell boundary region in the Het-Net scenario are actively being discussed.
In this environment, in order to efficiently manage the allocated radio resources and to support the high transmission rate, the wireless base stations use a digital unit (hereinafter referred to as 'DU') and a radio unit (hereinafter referred to as 'RU' And each RU forms an independent cell, thereby trying to maximize the frequency reuse efficiency.
Here, the CCC (Cloud Communication Center) structure in which the radio resource management of the RU is performed in a data center that is a separate DU or cloud-based DU aggregation is various cooperative communication technologies between inter base stations (inter eNB / RU / RRH) in a Het-Net scenario. It is possible to apply.
As such, a cell is formed through a base station having only radio signal processing, and the CCC structure of the radio resource management in the cloud-based data center is interlinked in the Het-Net scenario due to the introduction of macro and small cells. It facilitates the application of various cooperative communication technologies between base stations (inter eNB / RU / RRH). Through this, it is possible to solve the inter-cell interference problem and to efficiently manage the context of the terminal.
In addition, due to the transmission power imbalance between RUs, Het-Net scenarios in which the cell sizes covered by the respective RUs vary, are becoming common. As such, as the heterogeneous network scenario is generalized, various interference control schemes and cooperative communication schemes have been proposed to solve the interference between the macro cell and the small cell. However, in order to provide such a complex interference control scheme and a cooperative communication scheme, complex channel measurement and feedback are required accordingly.
There is no perfect solution to the problem of interference between macro and small cells that use essentially the same frequency band. In addition, a problem of increasing the load of the core network due to the frequent handover of the terminal due to the introduction of a small cell has also emerged.
In such a situation, apart from the environment in which the same frequency band is shared between the macro cell and the small cell, the high frequency band to be newly allocated for the wireless mobile communication is allocated to the small cell to separate the frequency band used between the macro cell and the small cell. And the way to solve the interference problem between the macro cell has emerged. That is, a scenario is emerging that separates the frequency band 1 (f1) provided by the macro base station eNB / RU / RRH and the frequency band 2 (f2) provided by the small base station eNB / RU / RRH.
When the frequency bands of the small cell and the macro cell are separated in this way, the interference problem between the cells is expected to be largely solved, unlike when the same frequency band is shared.
In addition, frequency band 1 (f1) provided by the macro base station (eNB / RU / RRH) refers to system information and radio resource control (hereinafter referred to as 'RRC') for maintaining a connection of a terminal. It serves as an anchor carrier that provides mobility management such as transmission and handover of voice traffic requiring transmission and reception of control information and low data rate. The frequency band 2 (f2) provided by the small base station eNB / RU / RRH serves as a boosting carrier that provides transmission for data traffic requiring high data rates. Through this, carrier aggregation between frequency bands supported by each macro base station (eNB / RU / RRH) and small base station (eNB / RU / RRH) provides two purposes of improving data rate and minimizing system overhead. It was possible to achieve at the same time.
However, in order for inter-cell carrier aggregation between the macro cell and the small cell to be applied, an arbitrary terminal must belong to the macro cell coverage and also to the corresponding small cell coverage.
That is, to apply a carrier aggregation (CA) technique to a frequency band provided by a small base station (eNB / RU / RRH) by a terminal connected through a frequency band provided by a macro base station (eNB / RU / RRH). In order to determine whether the corresponding UE belongs to the small cell coverage, it should be possible to determine first. However, unless an independent terminal positioning algorithm (eg, GPS or LBS) is applied to determine whether the terminal enters the small cell coverage, the access to the small cell coverage is determined by the continuous small base station of the terminal. Channel measurement for the frequency band provided by eNB / RU / RRH is needed.
In other words, even if the UE does not belong to the small cell coverage to which the actual inter-cell CA cannot be applied, in order to apply inter-cell carrier aggregation later when entering the small cell coverage, periodically or Aperiodic channel measurements for the frequency band of the small cell should be performed.
This may lead to unnecessary battery consumption from the viewpoint of the macro cell terminal which does not enter the small cell coverage. In addition, the system-specific reference symbol (cell-specific RS (eg CRS)) for the channel estimation of the frequency band of the terminal is unnecessary overhead because the base station (eNB / RU / RRH) of the small cell must always transmit (overhead) occurs.
However, in order to apply an inter-cell CA, a terminal having access to a macro base station (eNB / RU / RRH) enters small cell coverage and can communicate with the corresponding small base station (eNB / RU / RRH). Should be. In order to determine whether to enter the small cell coverage as described above, the terminal connected to the macro base station (eNB / RU / RRH) must perform continuous channel estimation for the corresponding frequency band 2 (f2).
As such, continuous channel estimation of the frequency band 2 (f2) and reporting the result thereof are inefficient in terms of power consumption of the terminal.
In addition, the base station (eNB / RU / RRH) constituting the small cell is also inefficient in terms of system overhead because the cell-specific RS must be continuously transmitted for channel estimation of the UE.
The technical problem to be achieved by the present invention is the operating frequency of the small cell to transmit and receive a reference signal (RS, Reference Signal) for determining whether the UE enters the small cell in a network environment where the operating frequency of the macro cell and the small cell are different Downlink channel estimation method, uplink channel estimation method, base station apparatus, and communication system providing mobility management method based on out-band channel estimation based on operating frequency of non-macro cell To provide.
According to an aspect of the present invention, a method for estimating a downlink channel may be performed in a network environment in which a first cell of a first base station using a first frequency band and a second cell of a second base station using a second frequency band overlap. A method for estimating a downlink channel of a terminal, the method comprising: receiving, by the terminal, a reference signal for downlink channel estimation through a subframe of the first frequency band from the second base station; And transmitting a result of estimating a downlink channel with the second base station to the first base station based on the reference signal.
In this case, the first cell may be a macro cell, and the second cell may include one or more small cells that have narrower service coverage than the macro cell and exist in the macro cell.
In addition, the receiving step,
Receiving configuration information of the reference signal from the first base station; Receiving a reference signal from the second base station through a subframe of the first frequency band; And estimating a downlink channel with the second base station based on the configuration information and the reference signal.
In addition, the reference signal,
Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS), Channel State Information Reference Signal (CSI-RS), Cell-Specific Reference Signal (Cell-specific) It may include at least one of a Reference Signal (CRS) and a Position Reference Signal (PRS).
In addition, the receiving step,
Receiving configuration information of a virtual cell ID assigned by the second base station from the first base station; Receiving the Primary Synchronization Signal (PSS) and the Secondary Synchronization Signal (SSS) through the subframe of the first frequency band from the second base station; And
Estimating a downlink channel with the second base station based on the configuration information of the virtual cell ID, the primary synchronization signal (PSS) and the secondary synchronization signal (SSS). have.
In addition, the receiving step,
Receiving configuration information of a virtual cell ID assigned by the second base station from the first base station; Receiving the cell-specific reference signal (CRS) from the second base station through a subframe of the first frequency band; And estimating a downlink channel with the second base station based on the configuration information of the virtual cell ID and the cell-specific reference signal (CRS).
In addition, the receiving step,
Receiving configuration information of a channel state information reference signal (CSI-RS) for the channel state information from the first base station; Receiving a channel state information reference signal (CSI-RS) for the channel state information through the subframe of the first frequency band from the second base station; And the second base station based on configuration information of the channel state information reference signal (CSI-RS) for the channel state information and the channel state information reference signal (CSI-RS) for the channel state information. Estimating a downlink channel of the.
In addition, the receiving step,
Receiving configuration information of a position reference signal (PRS) from the first base station; Receiving the position reference signal (PRS) from the second base station through a subframe of the first frequency band; And estimating the position of the terminal based on configuration information of the position reference signal (PRS) and the position reference signal (PRS).
The transmitting to the first base station may include transmitting a result of estimating the location of the terminal to the first base station.
In addition, the receiving step,
Receiving configuration information of a position reference signal (PRS) from the first base station; Receiving the position reference signal (PRS) from the second base station through a subframe of the first frequency band; And estimating the position of the terminal based on configuration information of the position reference signal (PRS) and the position reference signal (PRS).
The transmitting to the first base station may include requesting carrier merging between the first frequency band and the second frequency band when the location of the terminal enters the second cell. Can be.
In addition, as a result of estimating the downlink channel with the second base station,
The base station control apparatus managing the first base station or the first base station and the second base station determines whether the terminal enters the second cell to determine whether to merge the carrier between the first frequency band and the second frequency band. It can be used to
In accordance with another aspect of the present invention, an uplink channel estimation method includes
An uplink channel estimation method of the second base station in a network environment in which a first cell of a first base station using a first frequency band and a second cell of a second base station using a second frequency band overlap. Acquiring, by a base station, configuration information of a sounding reference signal allocated by the first base station to the terminal; Receiving the sounding reference signal from the terminal through a subframe of the first frequency band; And estimating an uplink channel with the terminal based on the configuration information and the sounding reference signal.
At this time, after the estimating step,
Transmitting the result of estimating the uplink channel to the first base station;
The result of estimating the uplink channel may be determined by a base station control apparatus managing the first base station or the first base station and the second base station to determine whether to merge carriers between the first frequency band and the second frequency band. It may be used to determine whether the terminal enters the second cell.
Further, after the estimating step,
Detecting a geometry value; Determining whether the terminal enters the second cell based on the geometry value; And when entering the second cell, transmitting a second cell entry notification of the terminal to the first base station.
The first base station may determine whether to merge the carrier between the first frequency band and the second frequency band for the terminal entering the second cell.
In addition, the base station control apparatus for managing the first base station and the second base station receives the second cell entry notification from the first base station and the first frequency band for the terminal entering the second cell and the first Whether to merge carriers between two frequency bands may be determined.
According to another aspect of the present invention,
A base station apparatus for forming a second cell having a narrower service coverage than the first cell in a network environment in which a first cell using a first frequency band and a second cell using a second frequency band overlap. A first antenna for transmitting and receiving a radio signal of the frequency band with the terminal; A first radio signal processor for processing radio signals of the second frequency band; A second antenna for transmitting and receiving the radio signal of the first frequency band with the terminal; And a second radio signal processor processing the radio signal of the first frequency band.
In this case, the second antenna and the second radio signal processor,
A reference signal for downlink channel estimation may be transmitted to the terminal through a subframe of the first frequency band.
In addition, the base station apparatus,
The first base station may further include a downlink management unit that obtains reference signal configuration information allocated to the terminal and generates the reference signal.
In addition, the second antenna and the second wireless signal processing unit,
A sounding reference signal for uplink channel estimation may be received from the terminal through a subframe of the first frequency band.
In addition, the base station apparatus,
The apparatus may further include an uplink manager that obtains configuration information of a sounding reference signal allocated to the terminal by the first base station and estimates an uplink channel according to the sounding reference signal based on the configuration information.
Communication system according to another aspect of the present invention,
A first radio unit for forming a first cell using a first frequency band and transmitting configuration information of a reference signal for uplink channel estimation or downlink channel estimation to a terminal; A second radio unit which forms a second cell using a second frequency band and transmits and receives the reference signal with the terminal through a subframe of the first frequency band; And a digital unit physically separated from the first radio unit and the second radio unit, connected to a core system to receive and digitally process radio signals from the first radio unit and the second radio unit.
At this time, the first wireless unit,
The terminal receives a result of estimating a downlink channel with the second cell using the reference signal, and determines whether the terminal enters the second cell based on the result of estimating the downlink channel. When entering the second cell, carrier aggregation between the first frequency band and the second frequency band may be determined.
In addition, the first wireless unit,
The terminal receives a result of estimating a downlink channel with the second cell by using the reference signal and transmits the result to the digital unit;
The digital unit,
Based on the result of estimating the downlink channel, it may be determined whether the terminal enters the second cell, and when entering the second cell, carrier merging between the first frequency band and the second frequency band may be determined.
In addition, the reference signal is a position reference signal,
The first wireless unit,
The carrier merging request between the first frequency band and the second frequency band may be received from the terminal entering the second cell.
In addition, the second wireless unit,
Estimating an uplink link channel with the terminal based on a reference signal received from the terminal through a subframe of the first frequency band, and transmitting an estimation result to the first wireless unit,
The first wireless unit,
It is determined whether the terminal enters the second cell based on a result of estimating the uplink link with the terminal, and determines the carrier merging between the first frequency band and the second frequency band when entering the second cell. Can be.
In addition, the second wireless unit,
Estimating an uplink link channel with the terminal based on a reference signal received from the terminal through a subframe of the first frequency band, and transmitting an estimation result to the first wireless unit,
The digital unit,
Receiving a result of estimating an uplink link with the terminal through the first radio unit, it is determined whether the terminal enters the second cell, and when entering the second cell, the first frequency band and the first channel. Carrier merge between two frequency bands can be determined.
In addition, the second wireless unit
On the basis of the reference signal received from the terminal through the subframe of the first frequency band, the UL channel estimation and geometry values with the terminal are detected to determine whether the terminal enters the second cell, and the second cell. In case of entering the first radio unit to notify the entry of the second cell,
The first wireless unit or the digital unit,
Carrier merge between the first frequency band and the second frequency band for the terminal entering the second cell may be determined.
According to an embodiment of the present invention, a wireless signal processing apparatus capable of processing a frequency band of a macro cell, that is, an antenna and a signal processor, may be installed in a small cell using a different frequency band from the macro cell, thereby additionally adding to the terminal and the system. It is possible to determine whether a UE enters a small cell without incurring channel estimation overhead.
In addition, when the terminal enters a specific small cell, it is possible to indicate the efficient carrier aggregation for the frequency band of the small cell (initiation).
1 is a configuration diagram of a communication system 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 a downlink channel estimation method according to an embodiment of the present invention.
8 is a flowchart illustrating a downlink channel estimation method according to another embodiment of the present invention.
9 is a flowchart illustrating a downlink channel estimation method according to another embodiment of the present invention.
10 is a flowchart illustrating a downlink channel estimation method according to another embodiment of the present invention.
11 is a flowchart illustrating a downlink channel estimation method according to another embodiment of the present invention.
12 is a flowchart illustrating an uplink channel estimation method according to an embodiment of the present invention.
13 is a flowchart illustrating an uplink channel estimation method according to another embodiment of the present invention.
14 is a flowchart illustrating an uplink channel estimation method according to another embodiment of the present invention.
15 is a flowchart illustrating an uplink channel estimation method according to another embodiment of the present invention.
DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement 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, .
Now, a downlink channel estimation method, an uplink channel estimation method, a base station apparatus, 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.
Referring to FIG. 1, a communication system to which an embodiment of the present invention is applied includes a
In such a wireless communication system, a
The
In addition, in a communication system to which an embodiment of the present invention is applied, a cooperative multi-point scenario (CoMP scenario) for increasing uplink and downlink data rates of a terminal 600 located in a cell boundary region through cooperative communication between adjacent cells is performed. Coordinated Multi-Point scenario) 3 and 4 may be a cloud-based base station structure, as shown in FIG.
Referring to FIG. 2, a cloud-based base station structure includes a
A typical base station includes a processing unit corresponding to each of the
Here, the
The RU 900 is a part for amplifying a radio wave signal in a radio signal processing section of a base station and radiating it to an antenna. That is, the RU 900 converts a digital signal received from the
Referring back to FIG. 1, the
Here, although the
At this time, the
Here, the first frequency band F1 requires transmission and reception of system information and radio resource control (hereinafter referred to as 'RRC') information for maintaining a connection of the terminal 600 and a low data rate. It serves as an anchor carrier that provides mobility management such as transmission of voice traffic and handover. The second frequency band F2 serves as a booster carrier that provides transmission for data traffic requiring high data rates.
In this case, the first frequency band F1 is operated based on a long term evolution (LTE) frequency band, and the second frequency band F2 is an uplink subframe according to traffic distribution of uplink and uplink in a new high frequency band. And a form in which the ratio of the downlink subframe can be adaptively changed. Here, the high frequency band is more suitable for the small cell for supporting the radio access to the terminal fixed to some extent in a local position than the macro cell in which the movement of the terminal is performed in a wide range because the Doppler effect greatly affects the mobility of the terminal. And, this further increases the possibility for the band separation scenario between the macro cell and the small cell.
In addition, downlink (DL) means communication from the
In this way, carrier aggregation (CA) between the first frequency band F1 and the second frequency band F2 may be used to improve data rate and minimize system overhead.
In addition, the terminal 600 is the
The terminal 600 utilizes carrier aggregation of the second frequency band F2 in order to boost the data rate in addition to the first frequency band F1.
According to the cooperative multi-point (CoMP) scenario, the terminal 600 located in the cell boundary region is required to estimate an uplink channel and a downlink channel with the
Here, the terminal 600 located in the cell boundary region is defined as a terminal located in the
In this case, in order to estimate the uplink channel and the downlink channel, channel estimation is performed using a reference signal (RS) known between the
Meanwhile, the
Here, overhearing is a sensor network that operates in an asynchronous manner, in particular, in a media access control (Media Access Control) of the sensor network, the node that wants to transmit to the neighboring neighbor nodes to perform the operation that the data that they want to send or When transmitting data, neighboring neighbor nodes receive overhearing even though they do not need the signal according to the operation or transmission.
Now, a schematic configuration of the
First, referring to FIG. 3, the
Here, the
The
Here, the
The
The carrier merger 175 determines or performs carrier merge between the first frequency F1 and the second frequency F2 based on the downlink channel estimation result received through the
Next, referring to FIG. 4, the
Here, the
In addition, the
Here, the
In this case, when the macro cell is a frequency-division duplex (hereinafter, referred to as 'FDD'), the
In addition, when the macro cell is a time division duplex (hereinafter, referred to as TDD), the
The
The
The
The
5, the base
Here, the
The
The
The
The
6, the terminal 600 includes a
Here, the
The
Here, the
The
Next, a channel estimation method for determining whether the terminal 600 enters the small cell will be described in connection with the configuration of FIGS. 3 to 6. Here, the same reference numerals as the components of FIGS. 3 to 6 will be used.
First, a method of estimating a downlink channel will be described. A reference signal for downlink channel estimation may be various embodiments.
In this case, an embodiment in which a synchronization signal is used as a reference signal will be described.
7 is a flowchart illustrating a downlink channel estimation method according to an embodiment of the present invention.
Referring to FIG. 7, the
Here, the synchronization signal includes a primary synchronization signal (hereinafter, referred to as 'PSS') and a secondary synchronization signal (hereinafter, referred to as 'SSS') for downlink channel estimation.
In addition, the virtual cell ID may be differently assigned to each of the
Next, the
In addition, the
Here, when the
In this case, in step S105, the
In addition, in step S105, the
Next, the
Here, the
Next, the
Here, the
In addition, the virtual cell ID may be transmitted together with the report.
Next, the carrier merger 175 of the
Next, the carrier merger 175 of the
Here, the
Next, an embodiment in which a reference signal for channel state information (hereinafter, referred to as 'CSI-RS') is used as a reference signal will be described.
8 is a flowchart illustrating a downlink channel estimation method according to another embodiment of the present invention.
Referring to FIG. 8, the
Here, the CSI-RS configuration information includes virtual cell ID information for sequence generation, antenna port configuration information, RE mapping information, subframe configuration information (that is, subframe offset and periodicity). can do.
Next, the
In addition, the
Here, the
In this case, UE-specific higher layer signaling is defined for zero-power CSI configuration or non-zero power CSI-RS configuration.
Next, the
Next, the
Here, the
Next, the carrier merger 175 of the
Next, the carrier merger 175 of the
Here, the
Next, an embodiment using a cell-specific reference signal (hereinafter, referred to as 'CRS') as a reference signal will be described.
9 is a flowchart illustrating a downlink channel estimation method according to another embodiment of the present invention.
Referring to FIG. 9, the
Next, the
In addition, the
Here, when the
In this case, in step S305, the
In operation S305, the
Next, the
Next, the
Here, the
Next, the carrier merger 175 of the
Next, the carrier merger 175 of the
Here, the
Now, two embodiments using a position reference signal (hereinafter, referred to as 'PRS') as a reference signal will be described.
10 is a flowchart illustrating a downlink channel estimation method according to another embodiment of the present invention.
Referring to FIG. 10, the
Here, the PRS configuration information includes a virtual cell ID for generating a PRS sequence and determining a cell-specific frequency shift value, subframe configuration information for PRS transmission, and the like.
Next, the
In addition, the
Then, the
Next, the
Then, the carrier merger 175 of the
Next, the carrier merger 175 of the
Here, the
11 is a flowchart illustrating a downlink channel estimation method according to another embodiment of the present invention.
Referring to FIG. 11, the
Next, the
In addition, the
In addition, the
Then, the
Next, the
At this time, when the terminal 600 enters the
Then, the carrier merger 175 of the
Here, the carrier merging unit 175 of the
Now, a method of estimating an uplink channel using a sounding reference signal (hereinafter referred to as SRS) will be described.
12 is a flowchart illustrating an uplink channel estimation method according to an embodiment of the present invention.
Referring to FIG. 12, the
Here, the terminal specific SRS configuration information may be transmitted to the terminal 600 through higher layer signaling. In addition, in the present embodiment, it is defined as periodic SRS configuration information.
In addition, the
Subsequently, when a period according to UE-specific SRS configuration information arrives (S605), the
Then, the
Next, the
Here, the geometry may be any available information indicating channel quality, such as signal-to-noise ratio (SNR) or bit error rate (BER). For example, the average received signal power for the
Next, if it is determined that the
Then, the carrier merger 175 of the
Here, the
13 is a flowchart illustrating an uplink channel estimation method according to another embodiment of the present invention.
Referring to FIG. 13, the
Here, the terminal specific SRS configuration information may be transmitted to the terminal 600 through higher layer signaling. In addition, in the present embodiment, it is defined as periodic SRS configuration information.
In addition, the
After that, when a period according to UE-specific SRS configuration information arrives (S705), the
Then, the
Next, the
Next, when the predetermined period arrives or satisfies the predetermined threshold in step S711, the UL channel estimation result is reported to the
Then, the carrier merger 175 of the
Then, the carrier merger 175 of the
Here, the
14 is a flowchart illustrating an uplink channel estimation method according to another embodiment of the present invention.
Referring to FIG. 14, the
Here, the terminal specific SRS configuration information may be transmitted to the terminal 600 through higher layer signaling. In addition, in the present embodiment, it is defined as aperiodic SRS configuration information.
In addition, the
Next, the
Then, the
Next, the
Next, the
Next, if it is determined that the
Then, the carrier merger 175 of the
Here, the
15 is a flowchart illustrating an uplink channel estimation method according to another embodiment of the present invention.
Referring to FIG. 15, the
Here, the terminal specific SRS configuration information may be transmitted to the terminal 600 through higher layer signaling. In addition, in the present embodiment, it is defined as aperiodic SRS configuration information.
In addition, the
Next, the
Then, the
Then, the
Next, the
Next, when a predetermined period arrives in step S911 or satisfies the predefined threshold, the uplink channel estimation result is reported to the
Then, the carrier merger 175 of the
Then, the carrier merger 175 of the
Here, the
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 (26)
Receiving, by the terminal, a reference signal for downlink channel estimation from the second base station through a subframe of the first frequency band; And
Transmitting a result of estimating a downlink channel with the second base station based on the reference signal to the first base station;
Downlink channel estimation method comprising a.
Wherein the first cell is a macro cell, and the second cell includes one or more small cells that have narrower service coverage than the macro cell and exist within the macro cell.
Wherein the receiving comprises:
Receiving configuration information of the reference signal from the first base station;
Receiving a reference signal from the second base station through a subframe of the first frequency band; And
Estimating a downlink channel with the second base station based on the configuration information and the reference signal
Downlink channel estimation method comprising a.
The reference signal,
Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS), Channel State Information Reference Signal (CSI-RS), Cell-Specific Reference Signal (Cell-specific) A downlink channel estimation method comprising at least one of a reference signal (CRS) and a position reference signal (PRS).
Wherein the receiving comprises:
Receiving configuration information of a virtual cell ID assigned by the second base station from the first base station;
Receiving the Primary Synchronization Signal (PSS) and the Secondary Synchronization Signal (SSS) through the subframe of the first frequency band from the second base station; And
Estimating a downlink channel with the second base station based on the configuration information of the virtual cell ID, the primary synchronization signal (PSS) and the secondary synchronization signal (SSS);
Downlink channel estimation method comprising a.
Wherein the receiving comprises:
Receiving configuration information of a virtual cell ID assigned by the second base station from the first base station;
Receiving the cell-specific reference signal (CRS) from the second base station through a subframe of the first frequency band; And
Estimating a downlink channel with the second base station based on the configuration information of the virtual cell ID and the cell-specific reference signal (CRS)
Downlink channel estimation method comprising a.
Wherein the receiving comprises:
Receiving configuration information of a channel state information reference signal (CSI-RS) for the channel state information from the first base station;
Receiving a channel state information reference signal (CSI-RS) for the channel state information through the subframe of the first frequency band from the second base station; And
With the second base station based on the configuration information of the channel state information reference signal (CSI-RS) for the channel state information and the channel state information reference signal (CSI-RS) for the channel state information. Estimating a downlink channel
Downlink channel estimation method comprising a.
Wherein the receiving comprises:
Receiving configuration information of a position reference signal (PRS) from the first base station;
Receiving the position reference signal (PRS) from the second base station through a subframe of the first frequency band; And
Estimating the position of the terminal based on configuration information of the position reference signal (PRS) and the position reference signal (PRS);
The step of transmitting to the first base station,
Transmitting the result of estimating the location of the terminal to the first base station;
Downlink channel estimation method comprising a.
Wherein the receiving comprises:
Receiving configuration information of a position reference signal (PRS) from the first base station;
Receiving the position reference signal (PRS) from the second base station through a subframe of the first frequency band; And
Estimating the position of the terminal based on configuration information of the position reference signal (PRS) and the position reference signal (PRS);
The step of transmitting to the first base station,
Requesting carrier merging between the first frequency band and the second frequency band when the location of the terminal enters the second cell;
Downlink channel estimation method comprising a.
The result of estimating the downlink channel with the second base station is
The base station control apparatus managing the first base station or the first base station and the second base station determines whether the terminal enters the second cell for determining whether to merge the carrier between the first frequency band and the second frequency band. Downlink channel estimation method used.
Acquiring, by the second base station, configuration information of a sounding reference signal allocated by the first base station to the terminal;
Receiving the sounding reference signal from the terminal through a subframe of the first frequency band; And
Estimating an uplink channel with the terminal based on the configuration information and the sounding reference signal
Wherein the uplink channel estimation method comprises:
After the estimating step,
Transmitting the result of estimating the uplink channel to the first base station;
The result of estimating the uplink channel may be determined by a base station control apparatus managing the first base station or the first base station and the second base station to determine whether to merge carriers between the first frequency band and the second frequency band. The uplink channel estimation method used to determine whether the terminal enters the second cell.
After the estimating step,
Detecting a geometry value;
Determining whether the terminal enters the second cell based on the geometry value; And
When entering the second cell, transmitting the second cell entry notification of the terminal to the first base station;
And the first base station determines whether to merge carriers between the first frequency band and the second frequency band for a terminal entering the second cell.
The base station control apparatus managing the first base station and the second base station receives the second cell entry notification from the first base station and enters the first cell and the second frequency for the terminal entering the second cell. An uplink channel estimation method for determining whether to merge carriers between bands.
A first antenna for transmitting and receiving a radio signal of the second frequency band with a terminal;
A first radio signal processor for processing radio signals of the second frequency band;
A second antenna for transmitting and receiving the radio signal of the first frequency band with the terminal;
A second radio signal processor configured to process radio signals in the first frequency band
.
The second antenna and the second radio signal processor,
A base station apparatus for transmitting a reference signal for downlink channel estimation to the terminal through a subframe of the first frequency band.
A downlink manager configured to obtain reference signal configuration information allocated to the terminal by the first base station and to generate the reference signal
Base station apparatus further comprising.
The second antenna and the second radio signal processor,
And a base station apparatus for receiving a sounding reference signal for uplink channel estimation from the terminal through a subframe of the first frequency band.
An uplink manager configured to acquire configuration information of a sounding reference signal allocated to the terminal by the first base station and estimate an uplink channel according to the sounding reference signal based on the configuration information
Base station apparatus further comprising.
A second radio unit which forms a second cell using a second frequency band and transmits and receives the reference signal with the terminal through a subframe of the first frequency band; And
A digital unit that is physically separated from the first wireless unit and the second wireless unit, and is connected to a core system to receive and digitally process radio signals from the first wireless unit and the second wireless unit.
Communication system comprising a.
The first wireless unit,
The terminal receives a result of estimating a downlink channel with the second cell using the reference signal, and determines whether the terminal enters the second cell based on the result of estimating the downlink channel. And determine a carrier merge between the first frequency band and the second frequency band when entering a second cell.
The first wireless unit,
The terminal receives a result of estimating a downlink channel with the second cell by using the reference signal and transmits the result to the digital unit;
The digital unit,
A communication system that determines whether the terminal has entered the second cell based on the result of estimating the downlink channel, and determines carrier aggregation between the first frequency band and the second frequency band when entering the second cell. .
The reference signal is a location reference signal,
The first wireless unit,
And a carrier merging request between the first frequency band and the second frequency band from a terminal entering the second cell.
The second wireless unit,
Estimating an uplink link channel with the terminal based on a reference signal received from the terminal through a subframe of the first frequency band, and transmitting an estimation result to the first wireless unit,
The first wireless unit,
It is determined whether the terminal enters the second cell based on the result of estimating the uplink link with the terminal, and when the terminal enters the second cell, carrier merging between the first frequency band and the second frequency band is determined. Communication system.
The second wireless unit,
Estimating an uplink link channel with the terminal based on a reference signal received from the terminal through a subframe of the first frequency band, and transmitting an estimation result to the first wireless unit,
The digital unit,
Receiving a result of estimating an uplink link with the terminal through the first radio unit, it is determined whether the terminal enters the second cell, and when entering the second cell, the first frequency band and the first channel. A communication system for determining carrier aggregation between two frequency bands.
The second wireless unit
On the basis of the reference signal received from the terminal through the subframe of the first frequency band, the UL channel estimation and geometry values with the terminal are detected to determine whether the terminal enters the second cell, and the second cell. In case of entering the first radio unit to notify the entry of the second cell,
The first wireless unit or the digital unit,
And determine a carrier merge between the first frequency band and the second frequency band for the terminal entering the second cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020120104162A KR20140037692A (en) | 2012-09-19 | 2012-09-19 | Method for estimating downlink and uplink, base station device and communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020120104162A KR20140037692A (en) | 2012-09-19 | 2012-09-19 | Method for estimating downlink and uplink, base station device and communication system |
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| Publication Number | Publication Date |
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| KR20140037692A true KR20140037692A (en) | 2014-03-27 |
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| KR1020120104162A KR20140037692A (en) | 2012-09-19 | 2012-09-19 | Method for estimating downlink and uplink, base station device and communication system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016163857A1 (en) * | 2015-04-10 | 2016-10-13 | 삼성전자 주식회사 | Method for estimating channel by base station in mobile communication system and device therefor |
| WO2016175609A1 (en) * | 2015-04-30 | 2016-11-03 | 삼성전자 주식회사 | Apparatus and method for estimating downlink channel in wireless communication system |
-
2012
- 2012-09-19 KR KR1020120104162A patent/KR20140037692A/en not_active Application Discontinuation
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016163857A1 (en) * | 2015-04-10 | 2016-10-13 | 삼성전자 주식회사 | Method for estimating channel by base station in mobile communication system and device therefor |
| US10404493B2 (en) | 2015-04-10 | 2019-09-03 | Samsung Electronics Co., Ltd. | Method for estimating channel by base station in mobile communication system and device therefor |
| WO2016175609A1 (en) * | 2015-04-30 | 2016-11-03 | 삼성전자 주식회사 | Apparatus and method for estimating downlink channel in wireless communication system |
| CN107624235A (en) * | 2015-04-30 | 2018-01-23 | 三星电子株式会社 | Apparatus and method for estimating the downlink channel in wireless communication system |
| US10367659B2 (en) | 2015-04-30 | 2019-07-30 | Samsung Electronics Co., Ltd. | Apparatus and method for estimating downlink channel in wireless communication system |
| CN107624235B (en) * | 2015-04-30 | 2020-08-28 | 三星电子株式会社 | Apparatus and method for estimating downlink channel in wireless communication system |
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