KR20140033774A - Method for estimating uplink channel and communication system - Google Patents
Method for estimating uplink channel and communication system Download PDFInfo
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- KR20140033774A KR20140033774A KR1020120100067A KR20120100067A KR20140033774A KR 20140033774 A KR20140033774 A KR 20140033774A KR 1020120100067 A KR1020120100067 A KR 1020120100067A KR 20120100067 A KR20120100067 A KR 20120100067A KR 20140033774 A KR20140033774 A KR 20140033774A
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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
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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
- H04L25/0226—Channel estimation using sounding signals sounding signals per se
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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
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
- H04L5/0035—Resource allocation in a cooperative multipoint environment
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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
An uplink channel estimation method and a communication system are provided. Here, the uplink channel estimation method includes a first sounding reference signal setting parameter for estimating an uplink channel with a serving base station, and a second sounding reference signal setting parameter for estimating an uplink channel with a neighboring base station, Receiving a second sounding reference signal setting parameter from the serving base station; Transmitting a first sounding reference signal generated based on the first sounding reference signal setting parameter to the serving base station; And transmitting a second sounding reference signal generated based on the second sounding reference signal setting parameter to the neighboring base station.
Description
The present invention relates to an uplink channel estimation method 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. 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.
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 Het-Net, various cooperative communication schemes between RUs to ensure a high data rate for a UE located in a cell boundary region, and an independent downlink path establishment due to an imbalance in coverage between the downlinks (that is, (RU) as a transmission point (hereinafter referred to as TP) for transmitting a downlink signal and a reception point (collectively referred to as 'RP' hereinafter) for receiving an uplink signal from the corresponding terminal, Is also proposed.
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 , Hereinafter referred to as " SRS ").
Generally, in the case of the SRS for measuring the uplink channel state, the UE transmits a radio resource control (RRC) parameter set from a serving BS to which the UE belongs . The RRC parameters include a cell-specific SRS subframe and SRS bandwidth, a UE-specific SRS bandwidth, a hopping pattern, a frequency domain position, domain position, periodicity, a subframe configuration, an antenna configuration, a base sequence index, and a cyclic shift index. have.
The UE transmits the SRS according to a UE-specific parameter in an uplink subframe / bandwidth region where a cell-specific parameter is satisfied.
Therefore, a scheme has been proposed in which the uplink channel measurement between the UE and the adjacent cell is possible by receiving the SRS transmission of the UE located in the cell boundary region not only in the serving BS but also in the neighbor BS. That is, the necessity of measuring an uplink channel with a plurality of base stations for cooperative communication has arisen, and a scheme has been proposed in which the SRS configuration information is shared with an adjacent base station so that it can be received by an adjacent base station.
However, since the conventional SRS is generated based on a physical cell ID (hereinafter, referred to as 'PCI') of a base station to which the UE belongs, it is impossible for other neighboring base stations to receive the SRS generated in the serving base station.
In addition, when the cell size between adjacent cells is different in the Het-Net, the uplink signal of the UE that has set up the uplink synchronization information (hereinafter, referred to as 'TA') based on the reception timing at the serving base station It is also unclear whether or not it is received synchronously with the adjacent base station.
Since the SRS setting information is determined by the parameters of the serving BS, even if the SRS setting information is shared with the neighbor BS, the neighbor BS must satisfy at least the following two conditions in order to receive the SRS.
1) Providing SRS sequence and resource allocation scheme that can be received in a plurality of cells
2) It is possible to apply the same uplink synchronization TA and Timing Alignment between the serving cell and the adjacent cell in the cell boundary region, or to set up a plurality of uplink synchronization (TA) settings in the UE
As described above, the conventional SRS transmission scheme considering only the uplink channel estimation with a single base station fails to provide a sufficient uplink channel estimation result to support various cooperative communication schemes in the CoMP scenario and HetNet.
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.
Also, the TA1 value, which is the uplink timing synchronization information with the serving base station, and the TA2 value, which is the timing synchronization information for transmitting the uplink signal to the adjacent base station, may be different from each other.
In particular, in the Het-Net, which is a generalized cell structure, even if the downlink synchronization between cells is coincident due to the difference of the inter-cell coverage, the uplink synchronization between the cells due to the difference of the propagation delay of the uplink Differences can occur. Therefore, even when a reference signal for uplink channel estimation is transmitted to an adjacent base station, it is necessary to acquire the uplink synchronization information TA2 from the neighbor base station.
SUMMARY OF THE INVENTION The present invention provides a method and a communication system for estimating an uplink channel of multiple cells using a sequential sounding reference signal transmission technique.
According to an aspect of the present invention, an uplink channel estimation method is a method for a UE to estimate an uplink channel. In addition to a first sounding reference signal configuration parameter for uplink channel estimation with a serving base station, Receiving a second sounding reference signal setting parameter for link channel estimation from the serving base station; Transmitting a first sounding reference signal generated based on the first sounding reference signal setting parameter to the serving base station; And transmitting a second sounding reference signal generated based on the second sounding reference signal setting parameter to the neighboring base station.
In this case,
And receiving the second sounding reference signal setting parameter from the serving base station through UE-specific radio resource control signaling.
In addition,
Receiving a sounding reference signal setting parameter from the serving base station through UE-specific radio resource control signaling including a sounding reference signal ID; And checking whether the sounding reference signal setting parameter is the second sounding reference signal setting parameter using the sounding reference signal ID.
In addition,
Receiving a sounding reference signal setting parameter from the serving base station through UE-specific radio resource control signaling; Receiving triggering information of an aperiodic sounding reference signal through a physical downlink control channel on which an indicator is defined; And checking whether the sounding reference signal setting parameter is the second sounding reference signal setting parameter using the indicator.
Also, before the step of allocating,
And receiving second uplink synchronization information that is uplink synchronization information with the neighbor base station in addition to first uplink synchronization information that is uplink synchronization information with the serving base station.
In addition, the step of receiving the second uplink synchronization information may include:
Transmitting a physical random access channel preamble to the neighbor base station; And receiving the second uplink synchronization information from the serving base station.
In addition, the step of transmitting to the neighbor base station,
Receiving a physical downlink control channel command including random access resource allocation information from the serving base station; And transmitting a physical random access channel preamble generated according to the random access resource allocation information to the neighbor base station,
Wherein the step of receiving the second uplink synchronization information comprises:
And receiving the random access channel response message including the second uplink synchronization information from the serving base station.
In addition, the step of transmitting to the neighbor base station,
Receiving random access resource allocation information from the serving base station through upper layer signaling; And transmitting a physical random access channel preamble generated according to the random access resource allocation information to the neighbor base station,
Wherein the step of receiving the second uplink synchronization information comprises:
And receiving the second uplink synchronization information through an upper layer signaling response message.
In addition,
Transmitting a physical random access channel preamble to the neighbor base station; And second uplink synchronization information, which is uplink synchronization information with the neighbor base station, and the second sounding reference signal configuration parameter, which are the uplink synchronization information from the serving base station to the serving base station, And receiving the data.
In addition, the step of transmitting to the neighbor base station,
Receiving a physical downlink control channel command including random access resource allocation information from the serving base station; And transmitting a physical random access channel preamble generated according to the random access resource allocation information to the neighbor base station,
Wherein the receiving of the second sounding reference signal setting parameter comprises:
Receiving the random access channel response message including the second uplink synchronization information and the second sounding reference signal configuration parameter.
In addition, the step of transmitting to the neighbor base station,
Receiving random access resource allocation information from the serving base station through upper layer signaling; And transmitting a physical random access channel preamble generated according to the random access resource allocation information to the neighbor base station,
Wherein the receiving of the second sounding reference signal setting parameter comprises:
And receiving an upper layer signaling response message including the second uplink synchronization information and the second sounding reference signal configuration parameter.
In addition, the step of transmitting to the serving base station,
Periodically or non-periodically transmitting the first sounding reference signal according to the first uplink synchronization information generated based on the first sounding reference signal setting parameter to the serving base station,
The method of
And transmitting the second sounding reference signal according to the second uplink synchronization information generated based on the second sounding reference signal setting parameter periodically or non-periodically to the neighboring base station.
According to another aspect of the present invention, there is provided a method of estimating an uplink channel by a serving base station, comprising: receiving a physical random access channel preamble from a terminal; And receiving second uplink synchronization information, which is uplink synchronization information with the neighbor base station, from the neighbor base station in addition to the first uplink synchronization information, which is uplink synchronization information with the serving base station, from the neighbor base station and transmitting the second uplink synchronization information to the terminal .
In this case,
And transmitting the second uplink synchronization information to the terminal through a response message including an uplink synchronization information ID field.
In addition, the step of transmitting to the terminal may include:
And transmitting the second uplink synchronization information to the mobile station through a response message having two or more uplink synchronization information ID regions determined according to cell overlapping degree.
In addition,
A random access channel response message or an upper layer signaling message.
The uplink channel estimation method further includes a second sounding reference signal setting parameter for uplink channel estimation with the neighbor base station in addition to the first sounding reference signal setting parameter for uplink channel estimation with the serving base station, To the terminal.
The step of allocating the second sounding reference signal setting parameter to the terminal may include:
Through the UE-specific radio resource control signaling including the sounding reference signal setting ID information area for distinguishing the first sounding reference signal setting parameter or the second sounding reference signal setting parameter from the second sounding reference signal, And assigning a signal setting parameter to the terminal.
The method further includes receiving a first sounding reference signal according to the first uplink synchronization information generated based on the first sounding reference signal setting parameter from the terminal; And transmitting a result of the uplink channel estimation based on the first sounding reference signal to the base station controller.
According to another aspect of the present invention, there is provided a method for estimating an uplink channel of an adjacent base station, comprising: receiving a physical random access channel preamble generated according to information allocated by a serving base station; Measuring uplink synchronization information between the mobile station and the neighboring base station using the physical random access channel preamble and transmitting the measured uplink synchronization information to the serving base station; Receiving a sounding reference signal generated according to the uplink synchronization information from the terminal; And reporting the uplink channel estimation result estimated using the sounding reference signal to the base station controller.
At this time, the sounding reference signal includes
And may be generated according to a sounding reference signal setting parameter for uplink channel estimation with the neighbor base station and the uplink synchronization information allocated by the serving base station.
According to another aspect of the present invention, in addition to a first sounding reference signal setting parameter for uplink channel estimation with a serving base station, a communication system further includes a second sounding reference signal setting parameter for uplink channel estimation with a neighbor base station A serving BS for receiving a first sounding reference signal generated based on the first sounding reference signal setting parameter from the MS and estimating an uplink channel; An adjacent base station for receiving a second sounding reference signal generated based on the second sounding reference signal setting parameter from the terminal and estimating an uplink channel; And a base station controller for estimating a multi-uplink channel for inter-cell cooperative communication using a result of estimating an uplink channel received from the serving base station and a result of estimating an uplink channel received from the neighbor base station .
At this time, the first sounding reference signal is generated according to first uplink synchronization information, the second sounding reference signal is generated according to second uplink synchronization information,
The serving base station may receive the second uplink synchronization information from the neighbor base station and may transmit the second uplink synchronization information to the terminal through a response message to the physical random access preamble received from the terminal .
In addition, the serving base station,
And transmits a response message including the second uplink synchronization information and the second sounding reference signal configuration parameter to the UE.
In addition, the serving base station,
And may transmit the second uplink synchronization information to the terminal through a response message including an uplink synchronization information ID field.
In addition, the serving base station,
And transmit the second sounding reference signal setting parameter to the UE through UE-specific RBOT signaling including the sounding reference signal ID.
In addition, the serving base station,
A physical downlink control channel including an indicator for identifying a sounding reference signal transmitted through the UE-specific radio resource control signaling may be transmitted to the UE.
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.
In addition, the serving base station and the neighbor base station,
Each of which is a radio signal processing apparatus for forming independent cells,
The base station control apparatus includes:
And a cloud-based base station structure implemented as a virtual server connected to the serving base station and the neighbor base station, performing a base station control management function, and installed in a central office of a communication company.
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 the embodiment of the present invention, not only the uplink channel estimation with the serving cell connected to the UE but also the SRS setup and transmission scheme for the uplink channel estimation with the adjacent cell. For this purpose, a second SRS setting scheme for uplink channel estimation with an adjacent base station and a transmission scheme of a terminal for the first SRS and the second SRS set are provided separately from the first SRS setting for the uplink channel estimation with the serving cell do. This enables multi-uplink channel estimation which can be applied universally in 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 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 process of acquiring uplink synchronization information (TA) according to an embodiment of the present invention.
FIG. 8 is a flowchart illustrating a process of acquiring uplink synchronization information (TA) according to another embodiment of the present invention.
9 is a flowchart illustrating a process of generating a PRACH preamble according to an embodiment of the present invention.
10 is a flowchart illustrating an uplink channel estimation method according to an embodiment of the present invention.
11 is a flowchart illustrating an uplink channel estimation method according to another embodiment of the present invention.
12 is a flowchart illustrating a method of determining a target terminal according to an embodiment of the present invention.
13 is a flowchart illustrating a method of determining a target terminal according to another embodiment of the present invention.
14 is a flowchart illustrating a method of determining a target terminal 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, 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.
Referring to FIG. 1, a communication system to which an embodiment of the present invention is applied includes a
In such a heterogeneous network, a
In addition, such a communication system includes Coordinated Multi-Point Scenarios (CoMPs) 3 and 4 (Coordinated Multi-Point Scenarios) for increasing the uplink and downlink data rates of the terminals located in the cell boundary region through cooperative communication between adjacent cells Based base station structure, which is 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
Referring again to FIG. 1, the
Although the
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
Here, the terminal 600 located in the cell boundary region is defined as a terminal located in the
Hereinafter, the
Here, the
The
At this time, the
Here, the target terminal is a multi-uplink estimation target terminal determined by the base
Meanwhile, the
Also, the
Then, the
That is, by estimating not only the uplink channel with the serving
Now, a schematic configuration of the serving
3, the serving
Here, the
The
Here, the
The uplink
The
The
In addition to the first SRS configuration parameter, the
The
4, the
Here, the
The
Here, the
The
The
The cell
5, the base
Here, the
The
The
At this time, the
For example, if the downlink channel estimation result with the serving
Therefore, the
Also, the
The
The
6, the
Here, the
The
Here, the uplink
The
The
The
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 a process of acquiring uplink synchronization information (TA) according to an embodiment of the present invention.
Referring to FIG. 7, the
Here, the
Next, the
Next, the
At this time, the physical downlink control channel command (PDCCH order) includes RACH 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
The RACH resource allocation information includes a PRACH preamble index (6 bits) and a PRACH mask index (Mask Index, 4 bits).
Then, the uplink
At this time, the uplink
Here, the PRACH configuration information is received through the cell-specific system information of the serving
Then, the uplink
The uplink
Here, the physical downlink control channel order (PDCCH order) and the PRACH configuration information are values set in the serving
Next, the uplink
Then, the uplink
Here, the 'TA ID' information area may be included in the RACH response message. In this case, the uplink
In this case, according to one embodiment, the 'TA ID' information region is allocated only to the serving
According to another embodiment, the 'TA ID' information area may be configured to allow two or more values to be set according to the number of TA values that the
As described above, according to the steps S101 to S121, the PRACH preamble is transmitted to the neighboring
8 is a flowchart illustrating a process of acquiring uplink synchronization information according to another embodiment of the present invention.
Referring to FIG. 8, the
Next, the
Next, the allocating
Next, the uplink
Then, the uplink
Also, the uplink
Next, the uplink
Then, the uplink
The process of generating the PRACH preamble by the uplink
At this time, each step shown in FIG. 9 may be added between steps S207 and S209 of FIG. And the upper layer signaling uses RRC signaling as an example.
9 is a flowchart illustrating a process of generating a PRACH preamble according to an embodiment of the present invention.
9, the uplink
Next, the uplink
If it is included, the uplink
If not included, the uplink
Next, the uplink
At this time, if included, the uplink
Next, a PRACH preamble for each TA ID is generated based on the information confirmed in step S311 (S313).
On the other hand, if it is not included, the PRACH preamble is generated based on the result of the analysis in step S305 or step S307 (S315).
A method for estimating a multi-uplink channel using SRS will be described with reference to FIGS. 10 and 11. FIG. At this time, the respective steps described in Figs. 10 to 11 are included after each step of Fig. 7 and Fig.
FIG. 10 is a flowchart illustrating an uplink channel estimation method according to an embodiment of the present invention, in which periodic SRS is transmitted.
Referring to FIG. 10, when a predetermined period according to the first SRS configuration parameter received from the serving
Here, the first SRS configuration parameter includes a UE-specific SRS configuration parameter received from the serving
Then, the uplink
Then, the
In addition, the
At this time, the additional second SRS configuration parameter includes all of the UE-specific SRS configuration parameters. Specifically, a cell-specific SRS subframe and an SRS bandwidth, a UE-specific SRS bandwidth, a hopping pattern, a frequency domain position ), A periodicity, a subframe configuration, an antenna configuration, a base sequence index, and cyclic shift index information .
If the UE-specific RRC signaling is the reconfiguration information for the first SRS configuration parameter with the established
To this end, according to one embodiment, the UE-specific RRC signaling includes an SRS ID information area and indicates whether it is the reconfiguration information for the first SRS configuration parameter or the second SRS configuration parameter Information.
At this time, the SRS ID information area may include the VCID (Virtual Cell ID) for reusing the TA ID information area or generating the SRS sequence.
In addition, according to another embodiment, the step S411 may be merged into the step S121 of FIG. 7 or the step S221 of FIG. The second SRS setup parameter may be included with the TA2 in the RACH response message or the higher layer signaling message. In this way, there is no need for a separate indicator for identifying the second SRS configuration parameter.
On the other hand, when a period according to the second SRS configuration parameter received in step S411 is reached (S413), the uplink
Then, the
Then, the
At this time, the first SRS and the second SRS are cyclically repeatedly transmitted as the periodic SRS set to the trigger type 0.
FIG. 11 is a flowchart illustrating an uplink channel estimation method according to another embodiment of the present invention, in which an aperiodic SRS is used as an embodiment.
11, an
Next, the non-periodic first SRS generated in step S501 is transmitted to the serving BS in step S503.
Next, the
Meanwhile, the
Next, the
10, the PDCCH may include only the triggering information, and may be configured to request non-periodic transmission for the first SRS using the SRS ID in the UE-specific RRC signaling, Or < / RTI >
Alternatively, step S509 may be merged into step S121 of FIG. 7 or step S221 of FIG. The second SRS setup parameter may be included with the TA2 in the RACH response message or the higher layer signaling message. In this way, there is no need for a separate indicator for identifying the second SRS configuration parameter.
Next, the uplink
Next, the uplink
Next, the
Then, the
7 and 8, a description will be made of an embodiment in which the
12 is a flowchart illustrating a method of determining a target terminal according to an embodiment of the present invention.
Referring to FIG. 12, the downlink
Then, the
Next, the
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.
13 is a flowchart illustrating a method of determining a target terminal according to another embodiment of the present invention.
Referring to FIG. 13, the
At this time, it is determined whether the estimation result satisfies the predefined condition (S703). 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
In addition, the downlink
Then, the
As described above, the downlink channel estimation result for the neighboring cell as well as the serving cell is defined to be transmitted in the form of measurement report RRC signaling.
14 is a flowchart illustrating a method of determining a target terminal according to another embodiment of the present invention.
Referring to FIG. 14, when the cell
Then, in step S805, the
Therefore, a dedicated PRACH resource for multi-uplink channel estimation can be allocated to a UE scheduled in a specific uplink band where a cell interference signal is detected.
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 (32)
Allocating a second sounding reference signal configuration parameter for uplink channel estimation with an adjacent base station from the serving base station in addition to a first sounding reference signal configuration parameter for uplink channel estimation with a serving base station;
Transmitting a first sounding reference signal generated based on the first sounding reference signal configuration parameter to the serving base station; And
Transmitting a second sounding reference signal generated based on the second sounding reference signal configuration parameter to the neighboring base station;
Wherein the uplink channel estimation method comprises:
Wherein the step of allocating comprises:
And receiving the second sounding reference signal setting parameter from the serving base station through UE-specific radio resource control signaling.
Wherein the step of allocating comprises:
Receiving a sounding reference signal setting parameter from the serving base station through UE-specific radio resource control signaling including a sounding reference signal ID; And
Checking whether the sounding reference signal setting parameter is the second sounding reference signal setting parameter using the sounding reference signal ID
Wherein the uplink channel estimation method comprises:
Wherein the step of allocating comprises:
Receiving a sounding reference signal setting parameter from the serving base station through UE-specific radio resource control signaling;
Receiving triggering information of an aperiodic sounding reference signal through a physical downlink control channel on which an indicator is defined; And
Determining whether the sounding reference signal setting parameter is the second sounding reference signal setting parameter using the indicator
Wherein the uplink channel estimation method comprises:
Before the step of being assigned,
In addition to the first uplink synchronization information, which is uplink synchronization information with the serving base station, receiving second uplink synchronization information, which is uplink synchronization information with the neighboring base station, in addition.
Further comprising the steps of:
The step of receiving the second uplink synchronization information,
Transmitting a physical random access channel preamble to the neighbor base station; And
Receiving the second uplink synchronization information from the serving base station
Wherein the uplink channel estimation method comprises:
The step of transmitting to the adjacent base station,
Receiving a physical downlink control channel command including random access resource allocation information from the serving base station; And
Transmitting the physical random access channel preamble generated according to the random access resource allocation information to the adjacent base station,
Wherein the step of receiving the second uplink synchronization information comprises:
And receiving the random access channel response message including the second uplink synchronization information from the serving base station.
The step of transmitting to the adjacent base station,
Receiving random access resource allocation information from the serving base station through upper layer signaling; And
Transmitting the physical random access channel preamble generated according to the random access resource allocation information to the adjacent base station,
Wherein the step of receiving the second uplink synchronization information comprises:
And receiving the second uplink synchronization information through an upper layer signaling response message.
Wherein the step of allocating comprises:
Transmitting a physical random access channel preamble to the neighbor base station; And
In addition to the first uplink synchronization information, which is uplink synchronization information with the serving base station, from the serving base station, additionally, the second uplink synchronization information, which is uplink synchronization information with the neighboring base station, and the second sounding reference signal configuration parameter are received. Steps to
Wherein the uplink channel estimation method comprises:
The step of transmitting to the adjacent base station,
Receiving a physical downlink control channel command including random access resource allocation information from the serving base station; And
Transmitting the physical random access channel preamble generated according to the random access resource allocation information to the adjacent base station,
Receiving the second sounding reference signal configuration parameter,
Receiving the random access channel response message including the second uplink synchronization information and the second sounding reference signal configuration parameter.
The step of transmitting to the adjacent base station,
Receiving random access resource allocation information from the serving base station through upper layer signaling; And
Transmitting the physical random access channel preamble generated according to the random access resource allocation information to the adjacent base station,
Receiving the second sounding reference signal configuration parameter,
And receiving an upper layer signaling response message including the second uplink synchronization information and the second sounding reference signal configuration parameter.
The step of transmitting to the serving base station,
Periodically or non-periodically transmitting the first sounding reference signal according to the first uplink synchronization information generated based on the first sounding reference signal setting parameter to the serving base station,
The transmitting to the neighbor base station,
And transmitting the second sounding reference signal according to the second uplink synchronization information generated based on the second sounding reference signal setting parameter periodically or non-periodically to the neighboring base station .
Receiving a physical random access channel preamble from a terminal; And
Receiving, from the neighbor base station, the second uplink synchronization information, which is uplink synchronization information with the neighbor base station, in addition to the first uplink synchronization information with the serving base station from the neighbor base station;
Wherein the uplink channel estimation method comprises:
The method of claim 1,
And transmitting the second uplink synchronization information to the terminal through a response message including an uplink synchronization information ID region.
The method of claim 1,
And transmitting the second uplink synchronization information to the terminal through a response message in which at least two uplink synchronization information ID regions determined according to the degree of cell overlap are set.
The response message includes:
A random access channel response message or an upper layer signaling message.
Allocating a second sounding reference signal configuration parameter for uplink channel estimation with an adjacent base station in addition to the first sounding reference signal configuration parameter for uplink channel estimation with the serving base station to the terminal;
Further comprising the steps of:
The step of allocating the second sounding reference signal setting parameter to the terminal includes:
The second sounding reference through a terminal specific radio resource control signaling including a sounding reference signal configuration ID information region for distinguishing whether the first sounding reference signal configuration parameter or the second sounding reference signal configuration parameter is included. Uplink channel estimation method comprising the step of assigning a signal configuration parameter to the terminal.
Receiving a first sounding reference signal according to the first uplink synchronization information generated based on the first sounding reference signal configuration parameter from the terminal; And
Transmitting a result of estimating an uplink channel based on the first sounding reference signal to a base station controller
Further comprising the steps of:
Receiving from the terminal a physical random access channel preamble generated according to the information allocated by the serving base station;
Measuring uplink synchronization information between the terminal and an adjacent base station using the physical random access channel preamble and transmitting the measured uplink synchronization information to the serving base station;
Receiving a sounding reference signal generated according to the uplink synchronization information from the terminal; And
Reporting the uplink channel estimation result estimated using the sounding reference signal to the base station controller
Wherein the uplink channel estimation method comprises:
The sounding reference signal,
Uplink channel estimation method generated according to a sounding reference signal configuration parameter for uplink channel estimation with the neighboring base station allocated by the serving base station and the uplink synchronization information.
An adjacent base station for receiving a second sounding reference signal generated based on the second sounding reference signal setting parameter from the terminal and estimating an uplink channel; And
A base station control apparatus for estimating a multi-uplink channel for inter-cell cooperative communication using a result of estimating an uplink channel received from the serving base station and a result of estimating an uplink channel received from the neighboring base station
≪ / RTI >
Wherein the first sounding reference signal is generated according to first uplink synchronization information, the second sounding reference signal is generated according to second uplink synchronization information,
The serving base station receives the second uplink synchronization information from the neighbor base station, and transmits the second uplink synchronization information to the terminal through a response message for the physical random access preamble received from the terminal. system.
The serving base station,
And transmits a response message including the second uplink synchronization information and the second sounding reference signal configuration parameter to the terminal.
The serving base station,
And transmits the second uplink synchronization information to the terminal through a response message including an uplink synchronization information ID field.
The serving base station,
And transmits the second sounding reference signal setting parameter to the terminal through UE-specific radio resource control signaling including a sounding reference signal ID.
The serving base station,
And transmits a physical downlink control channel including an indicator for identifying a sounding reference signal transmitted through the UE-specific radio resource control signaling to the UE.
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.
The serving base station and the neighbor base station,
Each of which is a radio signal processing apparatus for forming independent cells,
The base station control apparatus includes:
And a cloud-based base station structure that is connected to the serving base station and the adjacent base station, performs a base station control management function, and is implemented as a virtual server centrally installed in a communication station.
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.
Wherein the serving base station and the neighbor base station having cell coverage of different sizes are arranged in a superposed manner.
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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| KR1020120100067A KR101456700B1 (en) | 2012-09-10 | 2012-09-10 | Method for estimating uplink channel and communication system |
| PCT/KR2012/011069 WO2014038755A1 (en) | 2012-09-10 | 2012-12-18 | Method for estimating uplink channel and communication system |
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| WO2017179860A1 (en) * | 2016-04-10 | 2017-10-19 | 엘지전자 주식회사 | Method and device for transmitting data in wireless communication system |
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| KR102291457B1 (en) | 2014-09-03 | 2021-08-19 | 삼성전자주식회사 | Method and apparatus for estimating channel quality considering interference control and coordinated multi-point transmission and reception in cellular system |
| WO2016064061A1 (en) * | 2014-10-24 | 2016-04-28 | 엘지전자 주식회사 | Method for coordinating interference between cells in wireless communication system and apparatus for same |
| US11502761B2 (en) * | 2018-05-25 | 2022-11-15 | Qualcomm Incorporated | Enhanced RRM/CSI measurement for interference management |
| US10951283B2 (en) * | 2018-08-02 | 2021-03-16 | Qualcomm Incorporated | Paired sounding reference signal transmissions in multi-transmission/reception point operation |
| EP4075902A4 (en) * | 2019-12-31 | 2023-01-04 | Huawei Technologies Co., Ltd. | Sounding reference signal (srs) period configuration method and apparatus |
| CN116998195A (en) * | 2021-03-30 | 2023-11-03 | 苹果公司 | Neighbor cell Physical Random Access Channel (PRACH) and beam group based timing for Physical Downlink Control Channel (PDCCH) commands |
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| US8938247B2 (en) * | 2009-04-23 | 2015-01-20 | Qualcomm Incorporated | Sounding reference signal for coordinated multi-point operation |
| KR20130085357A (en) * | 2009-06-22 | 2013-07-29 | 알까뗄 루슨트 | Method and device for establishing uplink synchronization |
| CN102014476B (en) * | 2009-10-10 | 2013-09-04 | 电信科学技术研究院 | Uplink synchronization method, system and equipment |
| KR20110051969A (en) * | 2009-11-11 | 2011-05-18 | 주식회사 팬택 | Method and apparatus for transmission of reference signal and information for reference signal in coordinated multi-point transmission/reception system |
| KR101700956B1 (en) * | 2010-01-29 | 2017-01-31 | 삼성전자주식회사 | Method and apparatus for identifying a position of user euipment in a communication system |
| KR101080906B1 (en) * | 2010-09-20 | 2011-11-08 | 주식회사 이노와이어리스 | Apparatus for acquired preamble sequence |
| KR20120080492A (en) * | 2011-01-07 | 2012-07-17 | 주식회사 팬택 | Method and apparatus for transmitting and receiving aperiodic reference signal in communication systemwith multiple component carriers |
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| WO2017179860A1 (en) * | 2016-04-10 | 2017-10-19 | 엘지전자 주식회사 | Method and device for transmitting data in wireless communication system |
| US10708962B2 (en) | 2016-04-10 | 2020-07-07 | Lg Electronics Inc. | Method and device for transmitting data in wireless communication system |
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| WO2014038755A1 (en) | 2014-03-13 |
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