KR20160013506A - Methods for measuring a channel status and Apparatuses thereof - Google Patents
Methods for measuring a channel status and Apparatuses thereof Download PDFInfo
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- KR20160013506A KR20160013506A KR1020150081830A KR20150081830A KR20160013506A KR 20160013506 A KR20160013506 A KR 20160013506A KR 1020150081830 A KR1020150081830 A KR 1020150081830A KR 20150081830 A KR20150081830 A KR 20150081830A KR 20160013506 A KR20160013506 A KR 20160013506A
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- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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Abstract
The present invention relates to a method and an apparatus for measuring a channel state of a specific frequency band. More particularly, the present invention relates to a method for accurately measuring a channel state of a cell or a carrier using an unlicensed spectrum and a method for reporting measured channel state information to a base station. In particular, the present invention provides a method for measuring a channel state of a terminal, comprising: receiving measurement configuration information for channel state measurement of an unlicensed spectrum cell from a base station; Comprising the steps of: measuring a channel condition of a license-exempt band cell based on information and transmitting a channel status measurement result of a license-exempt band cell to a base station, wherein the license- Method and apparatus.
Description
The present invention relates to a method and an apparatus for measuring a channel state of a specific frequency band. More particularly, the present invention relates to a method for accurately measuring a channel state of a cell or a carrier using an unlicensed spectrum and a method for reporting measured channel state information to a base station.
As the communication system evolved, consumers such as businesses and individuals became using a wide variety of wireless terminals. The current mobile communication system such as LTE (Long Term Evolution) and LTE-Advanced of the 3GPP series is a high-speed and large-capacity communication system capable of transmitting and receiving various data such as video and wireless data beyond voice- It is required to develop a technique capable of transmitting large-capacity data in accordance with the above-described method. On the other hand, techniques are being discussed which allow carrier merging to be applied to various deployment scenarios as a result of the introduction of multiple cells or small cell deployments.
On the other hand, the carrier merging technique is a technique for merging one or more element carriers to transmit and receive data to improve the data transmission / reception ratio. In the terminal, the available frequency is increased and high-capacity data can be processed at a high speed.
However, the frequency for the mobile communication network is limited, and there is a limitation in providing a high-speed large-capacity data transmission / reception rate to a large number of users in a situation where the number of mobile communication subscribers is increased.
In addition, different frequency bands are used by different wireless communication systems depending on the policy, resulting in poor compatibility.
In order to solve the above-described problems, the present invention proposes a method and an apparatus for accurately measuring a channel state in a license-exempted band cell.
Also, the present invention proposes a method and apparatus for preventing frequency waste due to transmission of a reference signal for measuring a channel state of a license-exempt band cell.
Also, the present invention proposes a method and an apparatus for measuring a channel state according to a time interval of a license-exempted band cell and accurately measuring a channel state reflecting an interference signal of another communication system.
According to another aspect of the present invention, there is provided a method of measuring a channel state of a terminal, the method comprising: receiving measurement configuration information for channel state measurement of an unlicensed spectrum cell from a base station; Measuring the channel condition of the license-exempt band cell based on the type of the interval and the measurement configuration information, and transmitting the channel status measurement result of the license-exempt band cell to the base station, wherein the license- A method of using the frequency of the license-exempt band is provided.
According to another aspect of the present invention, there is provided a method of controlling a channel state measurement of a terminal in a base station, the method comprising: setting measurement configuration information for channel state measurement of an unlicensed spectrum cell; transmitting measurement configuration information; Receiving a measured channel condition measurement result of an unlicensed band cell based on a type of the interval in which the status measurement is performed and measurement configuration information, wherein the unlicensed band cell uses the frequency of the license-exempt band shared by the one or more communication systems ≪ / RTI >
According to another aspect of the present invention, there is provided a terminal for measuring a channel state, comprising: a receiver for receiving measurement configuration information for channel status measurement of an unlicensed spectrum cell from a base station; And a transmitter for transmitting the channel status measurement result of the license-exempted band cell to the base station, wherein the license-exempt band cell uses the frequency of the license-exempt band shared by the one or more communication systems And provides a terminal device.
According to another aspect of the present invention, there is provided a base station for controlling channel state measurement of a terminal, the base station including: a controller for setting measurement configuration information for channel state measurement of an unlicensed spectrum cell; a transmitter for transmitting measurement configuration information; And a receiving unit for receiving a result of measuring the channel condition of the license-exempted band cell measured based on the type of the interval and the measurement configuration information, wherein the license-exclusioning cell is a base station device that uses the frequency of the license- Lt; / RTI >
The present invention distinguishes and performs channel state measurement for each section of a license-exempt band cell, thereby providing an effect of accurately recognizing the state of the corresponding frequency band on the terminal side and using a license-unlicensed band cell of better quality.
Further, the present invention provides the effect that the base station can grasp the utilization state (load information) of the corresponding license-exempted band frequency at the terminal location based on the reported measurement results, and can set an optimal license-exempt band cell for the terminal.
1 is an exemplary diagram illustrating a layer 2 structure for downlink carrier merging.
FIG. 2 is an exemplary diagram illustrating a layer 2 structure for uplink carrier merging.
3 is a diagram for explaining an operation in which a terminal performs communication using a license band and a license-exempt band.
4 is an exemplary diagram for explaining a usable period in a license-exempt band cell.
5 is a diagram for explaining a terminal operation according to an embodiment of the present invention.
6 is a diagram for explaining a channel state measurement operation of a UE according to another embodiment of the present invention.
7 is a diagram for explaining transmission of a channel state measurement result according to another embodiment of the present invention.
8 is a view for explaining the operation of a base station according to another embodiment of the present invention.
9 is a diagram for explaining a configuration of a terminal according to another embodiment of the present invention.
10 is a diagram for explaining a configuration of a base station according to another embodiment of the present invention.
Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.
The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data and the like. A wireless communication system includes a user equipment (UE) and a base station (BS, or eNB). The user terminal in this specification is a comprehensive concept of a terminal in wireless communication. It is a comprehensive concept which means a mobile station (MS), a user terminal (UT), an SS (User Equipment) (Subscriber Station), a wireless device, and the like.
A base station or a cell generally refers to a station that communicates with a user terminal and includes a Node-B, an evolved Node-B (eNB), a sector, a Site, a BTS A base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell.
That is, in the present specification, a base station or a cell has a comprehensive meaning indicating a part or function covered by BSC (Base Station Controller) in CDMA, Node-B in WCDMA, eNB in LTE or sector (site) And covers various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, and small cell communication range.
Since the various cells listed above exist in the base station controlling each cell, the base station can be interpreted into two meanings. i) the device itself providing a megacell, macrocell, microcell, picocell, femtocell, small cell in relation to the wireless region, or ii) indicating the wireless region itself. i indicate to the base station all devices that are controlled by the same entity or that interact to configure the wireless region as a collaboration. An eNB, an RRH, an antenna, an RU, an LPN, a point, a transmission / reception point, a transmission point, a reception point, and the like are exemplary embodiments of a base station according to a configuration method of a radio area. ii) may indicate to the base station the wireless region itself that is to receive or transmit signals from the perspective of the user terminal or from a neighboring base station.
Therefore, a base station is collectively referred to as a base station, collectively referred to as a megacell, macrocell, microcell, picocell, femtocell, small cell, RRH, antenna, RU, low power node do.
Herein, the user terminal and the base station are used in a broad sense as the two transmitting and receiving subjects used to implement the technical or technical idea described in this specification, and are not limited by a specific term or word. The user terminal and the base station are used in a broad sense as two (uplink or downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are not limited by a specific term or word. Here, an uplink (UL, or uplink) means a method of transmitting / receiving data to / from a base station by a user terminal, and a downlink (DL or downlink) .
There are no restrictions on multiple access schemes applied to wireless communication systems. Various multiple access schemes such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, Can be used. An embodiment of the present invention can be applied to asynchronous wireless communication that evolves into LTE and LTE-Advanced via GSM, WCDMA, and HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB. The present invention should not be construed as limited to or limited to a specific wireless communication field and should be construed as including all technical fields to which the idea of the present invention can be applied.
A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.
In systems such as LTE and LTE-Advanced, the uplink and downlink are configured on the basis of one carrier or carrier pair to form a standard. The uplink and the downlink are divided into a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel, a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control Channel (EPDCCH) Transmits control information through the same control channel, and is configured with data channels such as PDSCH (Physical Downlink Shared CHannel) and PUSCH (Physical Uplink Shared CHannel), and transmits data.
On the other hand, control information can also be transmitted using EPDCCH (enhanced PDCCH or extended PDCCH).
In this specification, a cell refers to a component carrier having a coverage of a signal transmitted from a transmission point or a transmission point or transmission / reception point of a signal transmitted from a transmission / reception point, and a transmission / reception point itself .
The wireless communication system to which the embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-point transmission / reception system in which two or more transmission / reception points cooperatively transmit signals. antenna transmission system, or a cooperative multi-cell communication system. A CoMP system may include at least two multipoint transmit and receive points and terminals.
The multi-point transmission / reception point includes a base station or a macro cell (hereinafter referred to as 'eNB'), and at least one mobile station having a high transmission power or a low transmission power in a macro cell area, Lt; / RTI >
Hereinafter, a downlink refers to a communication or communication path from a multipoint transmission / reception point to a terminal, and an uplink refers to a communication or communication path from a terminal to a multiple transmission / reception point. In the downlink, a transmitter may be a part of a multipoint transmission / reception point, and a receiver may be a part of a terminal. In the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of multiple transmission / reception points.
Hereinafter, a situation in which a signal is transmitted / received through a channel such as PUCCH, PUSCH, PDCCH, EPDCCH, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH, EPDCCH and PDSCH are transmitted and received'.
In the following description, an indication that a PDCCH is transmitted or received or a signal is transmitted or received via a PDCCH may be used to mean transmitting or receiving an EPDCCH or transmitting or receiving a signal through an EPDCCH.
That is, the physical downlink control channel described below may mean a PDCCH, an EPDCCH, or a PDCCH and an EPDCCH.
Also, for convenience of description, EPDCCH, which is an embodiment of the present invention, may be applied to the portion described with PDCCH, and EPDCCH may be applied to the portion described with EPDCCH according to an embodiment of the present invention.
Meanwhile, the High Layer Signaling described below includes RRC signaling for transmitting RRC information including RRC parameters.
The eNB performs downlink transmission to the UEs. The eNB includes a physical downlink shared channel (PDSCH) as a main physical channel for unicast transmission, downlink control information such as scheduling required for reception of a PDSCH, A physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission in a Physical Uplink Shared Channel (PUSCH). Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.
In mobile communication systems, support for mobility of a terminal is essential. In order to support mobility, the UE can continuously measure the signal quality of a serving cell currently being served and the signal quality of neighboring cells surrounding a serving cell. The measured result is transmitted to the base station under a special condition, and the base station can support the mobility of the mobile station by instructing the mobile station to hand over to the neighboring cell based on the measurement result transmitted by the mobile station.
The channel state measurement in this specification means signal quality measurement for the serving cell or neighboring cells described above and should be understood in the same sense as channel quality measurement or signal quality measurement. Also, the channel state measurement result means the measurement result of the channel state and is used in the same meaning as the measurement result, the channel quality measurement result, or the signal quality measurement result.
The terminal determines the measurement object according to the measurement configuration information set by the base station and reports the measurement result. The UE receiving the message including the measurement configuration information performs channel state measurement operation according to the measurement configuration information and transmits the channel state measurement result generated as a result of the measurement operation to the base station.
As an example, the measurement configuration information may include the following parameters.
- Measurement objects: Information about the objects that the terminal should measure. For example, the measurement objects set in the terminal are respectively an intra-frequency measurement object, an inter-frequency measurement object, or an inter-RAT measurement object inter -RAT measurement object). For intra-frequency and inter-frequency measurements, the measurement object is one LTE carrier frequency.
Reporting configuration: Includes information on base station reporting time of the channel condition measurement result including the measurement result of the UE. For example, the terminal includes setting information on when to report to the base station about the channel state measurement result generated as a result of measuring the channel state based on the measurement configuration information.
- Measurement identities: Contains information about the ID that links a specific measurement object to a specific reporting configuration.
- Quantity configurations: Includes measurement quantities and configuration information for filtering measurement results.
- Measurement gaps: This is the part where data transmission / reception of the corresponding terminal is not performed, and includes information on the time allocated for the terminal to perform measurement operation purely.
The terminal receives the above-described measurement configuration information and measures the channel status of the measurement target using each information included in the measurement configuration information. The UE can transmit the channel status measurement result to the BS using the measurement configuration information and the measured result.
Meanwhile, the UE may apply Layer 3 filtering using Equation (1) below before transmitting the measured channel condition measurement result to the BS.
Each parameter in Equation (1) means the following value.
M n : Measurement result most recently received from the physical layer.
F n : updated filtered measurement results used for measurement reporting.
F n -1 : Previously filtered measurement result, however, when the first measurement result is received by the physical layer, F 0 is set to M 1
a = 1/2 (k / 4) , k is a filter coefficient (filterCoefficient)
The UE can transmit the measurement result of the channel state through the filtering according to Equation (1) and transmit it to the base station. Through this, the BS can check the channel state measurement result of the UE and set up a carrier merge or a dual connectivity configuration in the UE. In addition, the base station can control activation or non-activation of a cell or a carrier configured in the base station or control addition / modification of a cell or a carrier using the channel state measurement result.
Meanwhile, according to the introduction of carrier aggregation (CA) technology, radio resources for uplink or downlink data transmission can be allocated to a single terminal through a plurality of carriers or serving cells. Accordingly, it is possible to support an improved data transmission rate in comparison with existing communication systems operating in a single carrier or serving cell.
As CA technology is supported, CA-enabled UEs that are in the coverage of a base station that supports CAs are allowed to connect to the primary cell through an initial RRC connection / configuration procedure (RRC connection / configuration procedure) ) And addition / release of a secondary cell through an RRC connection reconfiguration process. In addition, the CA-capable UE can additionally use up to five CCs or serving cells through a process of activation / deactivation of scell through MAC CE (Control Element) signaling.
1 is an exemplary diagram illustrating a layer 2 structure for downlink carrier merging. FIG. 2 is an exemplary diagram illustrating a layer 2 structure for uplink carrier merging.
Also, in the case of a UE to which a CA is applied, separate HARQ entities are defined for each CC or serving cell at the time of uplink or downlink data transmission, as shown in FIGS. 1 and 2, The HARQ procedure can be operated.
As each HARQ entity is defined for each CC or serving cell and the HARQ procedure is independently performed for each CC or serving cell, a transport block (TB) in which initial transmission is performed through an arbitrary CC or serving cell And the retransmission is performed through the same CC or serving cell.
< In the license-exempt zone LTE Connection using communication technology ( Licensed Assisted Access using LTE in unlicensed spectrum )>
Mobile telecommunication carriers in each country constitute a wireless cell by exclusively using licensed spectrum frequencies licensed from the government, and provide wireless communication services to the user terminals based on the constitution. Therefore, it is desired to provide high spectral efficiency through technologies such as MIMO, ICIC and CoMP with a radio access technology (RAT) for efficiently using a limited frequency band. In addition, a carrier merging (CA) technique capable of supporting a higher data rate by merging a plurality of carriers existing in a continuous or non-continuous frequency band has been studied.
However, with the recent introduction of mobile devices with high processing power, including smartphones and tablets, mobile traffic of users is rapidly increasing. Therefore, each wireless communication service provider needs a plurality of frequency resources in order to cover the improved mobile traffic. However, licensed band frequency resources are limited or there is a limit depending on the policy situation of each country.
In this situation, there is an increasing need for providing LTE / LTE-A services through an unlicensed spectrum, which is used to provide short-range wireless communication services such as WiFi and Bluetooth.
However, in the case of license-exempt bands, unlike licensed bands, many users, including individuals within the regulations of each country, are freely available for the provision of wireless telecommunication services, rather than wireless channels exclusively available to arbitrary operators .
Therefore, signal interference and coexistence with other communication systems may occur when LTE / LTE-Advanced services are provided through the license-exempt band. For example, when a mobile communication service such as LTE is to be provided using a license-exempt band, co-existence with various short-range wireless communication protocols such as WiFi, Bluetooth, NFC, Problems can arise. In addition, co-existence problems may occur with each LTE provider. Therefore, a method for solving such a problem is needed.
For example, when providing an LTE / LTE-A service through a license-exempted band, a wireless channel or a power level of a carrier to be used before transmitting a radio signal in order to avoid interference or collision between the respective wireless communication services ) To support a radio channel access method based on LBT (Listen Before Talk) for determining whether the corresponding radio channel or carrier can be used. In this case, if the specific radio channel or carrier of the unlicensed band is in use by another wireless communication protocol or another service provider, there is a possibility that the LTE / LTE-Advanced service through the corresponding bandwidth may be restricted. Therefore, unlike the LTE / LTE-Advanced service through the licensed band, the user can not guarantee the desired QoS in the LTE / LTE-Advanced service through the license-exempt band.
3 is a diagram for explaining an operation in which a terminal performs communication using a license band and a license-exempt band.
Referring to FIG. 3, in the case of LTE / LTE-A service provision through the license-exempted band, a licensed-assisted access (LTE) scheme through carrier aggregation with a carrier or cell configured through a license band Service provision may be considered. In this case, the primary carrier supports the FDD or TDD frame structure through the license band, and the secondary carrier configured through the license-exempt band is used for the downlink only Lt; / RTI > Or a secondary carrier configured through a license-exempt band, it may be a form supporting both the uplink and the downlink. That is, the terminal performs the carrier merging to perform the communication, and the primary carrier can process both the uplink and the downlink using the license band dedicated for the mobile communication system. On the other hand, the terminal may process only the downlink dedicated data using a frequency using the license-exempt band as the secondary carrier. Alternatively, the terminal may process both the uplink and downlink data through the secondary carrier.
Hereinafter, for the convenience of understanding, a cell configured through the license-exempt band of FIG. 3 will be referred to as a license-exclusion band cell. It should be noted, however, that this is for convenience of description, and is not limited to the name, and may be used to include all the cells of the mobile communication system using the license-exempt band frequency. That is, a license-exempt band cell refers to a cell using an unlicensed band frequency shared by one or more communication systems.
The present invention relates to a method for stably handling data retransmission that may occur in a time period when a frequency of a license-unlicensed band can not be used when communication is performed in a license-exempt band cell using frequencies of an unlicensed band shared by a plurality of communication systems And an apparatus.
4 is an exemplary diagram for explaining a usable period in a license-exempt band cell.
Referring to FIG. 4, in the case of a license-exempted band cell formed by a licensee through a license-exempt band frequency, the corresponding frequency band may be a license-exempt band cell formed by another business entity or another wireless access technology such as WiFi or Bluetooth Access Technology, RAT) system, so the corresponding frequency band can not be used exclusively. Accordingly, when the corresponding frequency band is available through LBT (Listen before talk), it is possible to configure the license-exempt band cell through the frequency band of the license-exempt band for a specific time period to support the terminal. However, even if the license-exempt band cell is configured through the license-exempt band frequency, the frequency band should be emptied for another service provider or another communication system for a specific time after a predetermined time.
In the present invention, for convenience of understanding, as shown in FIG. 4, a time period in which an operator configures a license-exempt band cell in an arbitrary frequency band and can support a terminal of the corresponding provider is referred to as a license- And the time period in which the license-exempted band cell can not be constructed in the frequency band is referred to as the license-exempted band cell inaccessible period. However, this is also for convenience of explanation, and does not limit the name.
For example, information on an available period of a license-exempted band cell can be indicated by a base station through a cell of a licensed spectrum such as PCell of the terminal. The information on the available period of the license-exempt band cell may include information on the start time of the available period or the period of the available period.
In order to construct a license-exempted band cell through the licensed band cell, the base station can set the terminal to perform channel quality measurement on the license-exempted band cell.
The base station transmits a reference signal (RS) to an unlicensed band cell in an available period, and the terminal performs channel state measurement (e.g., RSRP, RSRQ) of the corresponding cell.
However, since the base station and the mobile station are spaced apart from each other locally, the scope of detecting radio signals of an unlicensed spectrum frequency is different from each other. Therefore, the base station needs to receive reports from the terminal about the channel status information using the license-exempt band frequency.
It may be difficult to measure the accurate channel state when the UE performs channel state measurement only in an available period of an unlicensed band cell configured in the UE. For example, interfering signals from other irregular and unpredictable other communication systems (e.g., WLAN terminal, AP, etc.) may not be included in the channel state measurement results. In this case, the channel state measurement result of the corresponding cell may not properly reflect the actual channel state of the UE. In particular, if the available period is short, there is a greater possibility that the measured channel state value of the corresponding cell is inaccurate.
In addition, since the unlicensed band frequency use state information (load information) information can not be accurately known at the location of the terminal, the communication between the base station and the terminal may not be smooth.
In addition, even if the license-exempt band cell is not transmitting data, the BS must transmit only the RS by reserving a long time to measure the quality of the license-exempt band cell. In this case, the corresponding frequency can not be used in another RAT such as WLAN Frequency waste occurs.
In order to solve the above problems, the present invention proposes a method and apparatus for performing channel state measurement by distinguishing an available period and an unavailable period of a license-exempt band cell. Through this, the base station can accurately grasp the state of the corresponding frequency band at the side (position) of the terminal, and can use the unlicensed band cell of better quality.
In addition, the present invention can determine the utilization state (load information) and the like of the corresponding license-exempt band frequency at the terminal location based on the reported measurement results, and thus can set an optimum license-exclusion band cell for the terminal.
5 is a diagram for explaining a terminal operation according to an embodiment of the present invention.
A method for measuring a channel state of a terminal according to an exemplary embodiment of the present invention includes receiving measurement configuration information for channel state measurement of an unlicensed spectrum cell from a base station, And measuring the channel condition of the license-exempt band cell based on the measurement configuration information, and transmitting the channel status measurement result of the license-exclusion band cell to the base station.
Referring to FIG. 5, the terminal of the present invention includes receiving measurement configuration information for channel state measurement of an unlicensed spectrum cell from a base station (S510). For example, the terminal may receive measurement configuration information for channel state measurement of frequencies constituting an unlicensed band cell from a base station. The license-exempted band cell may be composed of one or more frequency bands, and the frequency band of the license-exempted band cell means a frequency band shared by other communication systems. The terminal may receive measurement configuration information through the licensed band cell.
On the other hand, the measurement configuration information may include set information that is classified according to the type of the time point at which the UE performs channel state measurement. For example, the measurement configuration information may include measurement configuration information for channel state measurement in the available interval and measurement configuration information for channel state measurement in the unavailable interval. As described above, the measurement configuration information divided and set according to the channel state measurement interval may be set differently from the measurement object, the measurement method, and the like. That is, some or all of the parameters constituting the measurement configuration information may be set differently according to the respective types of intervals.
The type of the interval during which the UE performs the channel status measurement may be classified into an available interval in which the license-exempted bandwidth cell can use the license-exempted bandwidth frequency and an unavailable interval in which the license-exempted bandwidth cell can not use the license-exempted bandwidth frequency. The unavailable interval means the time interval of the license-exempt band frequency occupied by another communication system or other mobile communication provider.
The terminal includes a step of measuring a channel state of the license-exempt band cell based on the type of the interval in which the channel state measurement is performed and the measurement configuration information (S520). For example, the UE measures the channel status using the received measurement configuration information. In this case, the UE distinguishes whether a time point of performing the channel state measurement operation is an available period or an unusable period, and performs channel state measurement using measurement configuration information set according to each interval type. That is, the UE can perform a channel state measurement operation classified according to the type of the interval to which the channel state measurement time point belongs. The UE performs a channel state measurement operation separately set for each channel state measurement interval, thereby obtaining accurate channel state measurement results.
Specifically, if the unlicensed band cell is available, the UE performs channel state measurement using the measured configuration information at the time when the channel state measurement operation is performed. In this case, one or more of the RSSI, RSRP, RSRQ and energy detection described above may be performed. If the UE determines that the unlicensed band cell is not available at the time the channel status measurement operation is performed, the UE may not perform the channel status measurement operation. That is, the UE first determines whether the corresponding license-exempted bandwidth cell is available or not available at the time of performing the channel state measurement operation, and performs a channel state measurement operation only when the corresponding license- can do.
The terminal includes a step of transmitting the channel status measurement result of the license-exempt band cell to the base station (S530). The UE performs an operation classified according to the type of the channel state measurement interval at the time of performing the channel state measurement operation, and transmits the result of the channel state measurement to the base station. For example, the channel state measurement result may include indication information indicating a measurement period in which the channel state measurement result is a measurement result. That is, the channel state measurement result may include indication information indicating the type of the interval in which the channel state measurement is performed. The base station can confirm through the indication information of the received channel state measurement result that the measurement result information is the information measured in the time interval of the license-exempted band cell. Specifically, the instruction information may be composed of 1 bit, but is not limited thereto.
Hereinafter, the terminal detailed operation of the present invention will be described with reference to Figs. 6 and 7. Fig.
6 is a diagram for explaining a channel state measurement operation of a UE according to another embodiment of the present invention.
Referring to FIG. 6, the terminal receives measurement configuration information for measurement of a license-unlicensed band cell or license-exempt band frequency from the base station (S610). The measurement configuration information may be received via higher layer signaling. For example, the measurement configuration information may be received in a form in which a license-exempt band is added to "MeasConfig ", which is an existing information element (IE) of the RRC Connection Reconfiguration message. Or the measurement configuration information may be received via a newly defined information element.
For example, a measurement object for a license-exempt band in the measurement configuration information received by the terminal may be set to one or a plurality of license-exempt band frequencies (s).
Alternatively, the measurement configuration information received by the terminal may be differently set as an available period and an unavailable period for a license-exempt band cell or frequency set as a measurement object. For example, the measurement configuration information may be set to a different value depending on the type of interval at which the measurement is performed with respect to the license-exempt band cell or frequency set as the measurement target. For example, the value to be measured may be set to any one of energy detection, noise level measurement, SINR, Received Signal Strength Indicator (RSSI), RSRP and RSRQ of the corresponding frequency or cell.
The terminal can determine the type of the license-exempt band cell at the time when the channel state measurement of the license-exempted band cell is performed (S620). For example, it is possible to determine whether a received reference signal for channel state measurement is received in an available section of a license-exempt band cell or in an unavailable section. The terminal, as described above, knows information on available or unavailable intervals of a license-exempt band cell. Accordingly, when performing channel state measurement based on the measurement configuration information, the UE can check the type of the period to which the channel state measurement time point belongs.
Thereafter, the UE divides the available and unavailable intervals based on the received measurement configuration information (S630, S640).
For example, if the UE belongs to the available interval, the UE can perform the channel status measurement operation using the measurement configuration information of the available interval (S630). For example, the terminal may perform RSSI, Reference Signal Received Power (RSRP) or Reference Signal Received Quality (RSRQ) measurements on a license-exempt band cell or frequency.
In another example, when the UE belongs to the unavailable period, the UE may perform the channel status measurement operation using the measurement configuration information of the unavailable period (S640). For example, the terminal may perform RSSI, energy detection, or noise level measurement on a license-exempt band cell or frequency.
In addition to this, the UE can receive RSSI, RSRP (Reference Signal Received Power), and RSRQ (Radio Link Control) regardless of RSSI, energy detection, noise level measurement, (Reference Signal Received Quality) measurement operation.
In addition, the channel status measurement operation of the terminal can be performed by dividing the detailed operation such as layer 3 filtering according to each of the available section and the unavailable section of the license-exempt band cell according to the measurement configuration information.
Include instruction information in channel state measurement results
The terminal of the present invention transmits the measurement result of the channel state to the base station by the above-described method. In this case, the base station needs to know which channel the result of the channel condition measurement is measured in which time zone of the license-exempted band cell.
To this end, the terminal of the present invention can transmit the channel status measurement result together with the indication information indicating the measurement result of the measurement result in which the measurement result is performed. For example, if the time point at which the channel state measurement operation is performed is a usable period, the value of the indication information may be set to 0 and stored together with the channel state measurement result. If the time when the channel state measurement operation is performed is in an unavailable period, the value of the indication information is set to 1 and stored together with the channel state measurement result. In transmitting the channel status measurement result to the base station, the terminal may transmit the stored indication information according to the reporting condition of the measurement configuration information.
The operation of the specific terminal will be described with reference to FIG.
7 is a diagram for explaining transmission of a channel state measurement result according to another embodiment of the present invention.
Referring to FIG. 7, the terminal of the present invention receives measurement configuration information for measurement of an unlicensed band cell or license-exempt band frequency from a base station (S710). The measurement configuration information may be received via higher layer signaling. For example, the measurement configuration information may be received in a form in which a license-exempt band is added to "MeasConfig ", which is an existing information element (IE) of the RRC Connection Reconfiguration message. Or the measurement configuration information may be received via a newly defined information element.
For example, a measurement object for a license-exempt band in the measurement configuration information received by the terminal may be set to one or a plurality of license-exempt band frequencies (s).
Alternatively, the measurement configuration information received by the terminal may be differently set as an available period and an unavailable period for a license-exempt band cell or frequency set as a measurement object. For example, the measurement configuration information may be set to a different value depending on the type of interval at which the measurement is performed with respect to the license-exempt band cell or frequency set as the measurement target. For example, the value to be measured may be set to any one of energy detection, noise level measurement, SINR, RSSI, RSRP, and RSRQ of the corresponding frequency or cell. As described above, the measurement configuration information may be set differently according to the interval to which the channel state measurement time point belongs.
The UE can perform the channel state measurement operation according to the measurement configuration information and the interval type of the channel state measurement time (S720). A method of separately performing channel state measurement operations is described with reference to FIG.
The UE determines in which interval the channel state measurement is performed (S730). If the channel state measurement is performed in the available period of the license-exempt band cell, the measurement result information and the information indicating the available period can be stored. Conversely, when the channel state measurement is performed in the unusable section of the license-exempted band cell, information indicating the measurement result information and the unavailable section can be stored.
After transmitting the channel state measurement result to the base station, the terminal may transmit indication information indicating the available time in the channel state measurement result (S740). Or if the corresponding channel state measurement is performed in the unavailable interval, the indication information indicating the unavailable interval may be included in the channel state measurement result and transmitted (S750). The transmission of the channel state measurement result of the terminal may be performed periodically or may occur when the set condition is satisfied. The channel state measurement result transmission operation can be performed differently according to the instruction information. For example, the channel state measurement result transmitted together with the indication information indicating the available interval is transmitted periodically, and the channel state measurement result transmitted together with the indication information indicating the unavailable interval may be transmitted upon occurrence of the event have. Of course, the opposite case may also work. In addition, when the channel condition measurement result reporting condition of the measurement configuration information is set differently for each interval, the transmission operation of the channel condition measurement result may be performed according to the reporting condition. There is no specific limit to the specific method by which the transmission operation of the channel state measurement result is classified according to the instruction information value.
In the above description, the instruction information is included in the channel state measurement result, but the channel state measurement result and the instruction information may be transmitted together. That is, the indication information may be included in the channel state measurement result or may be transmitted in connection with the channel state measurement result. There is no limit to the specific transmission method of the instruction information.
The operation of the base station capable of performing all of the operations of the present invention described above will be described with reference to the drawings.
8 is a view for explaining the operation of a base station according to another embodiment of the present invention.
The base station according to another exemplary embodiment of the present invention includes a step of setting measurement configuration information for channel state measurement of a license-exempt band cell, a step of transmitting measurement configuration information, a type of a section in which channel state measurement is performed, And receiving a channel state measurement result of the license-exempted band cell measured based on the channel state measurement result.
Referring to FIG. 8, the base station of the present invention includes setting measurement configuration information for channel state measurement of a license-exempt band cell (S810). As described above, the measurement configuration information can be divided and set according to the type of the section in which the channel state measurement is performed. For example, a measurement object for a license-exempt band in the measurement configuration information received by the terminal may be set to one or a plurality of license-exempt band frequencies (s). Alternatively, the measurement configuration information received by the terminal may be differently set as an available period and an unavailable period for a license-exempt band cell or frequency set as a measurement object. For example, the measurement configuration information may be set to a different value depending on the type of interval at which the measurement is performed with respect to the license-exempt band cell or frequency set as the measurement target. For example, the value to be measured may be set to any one of energy detection, noise level measurement, SINR, RSSI, RSRP, and RSRQ of the corresponding frequency or cell.
The base station includes a step of transmitting the set measurement configuration information to the terminal (S820). For example, measurement configuration information may be transmitted via higher layer signaling. For example, the measurement configuration information may be transmitted in a form in which a license-exempt band is added to "MeasConfig", which is an existing information element (IE) of the RRC Connection Reconfiguration message. As another example, the measurement configuration information may be transmitted via a newly defined information element.
The base station includes receiving the channel state measurement result of the license-unlicensed band cell measured based on the type of the interval in which the channel state measurement is performed and the measurement configuration information (S830). As described above, the type of the interval in which the channel status measurement is performed can be divided into the available interval in which the license-exempted bandwidth cell can use the license-exempted bandwidth frequency and the unavailable interval in which the license-exempted bandwidth cell can not use the license-exempted bandwidth frequency. On the other hand, the channel state measurement result includes the measured configuration information classified according to the type of the section in which the channel state measurement is performed, and the measurement result according to the divided measurement operation based on the type of the section in which the channel state measurement is performed.
For example, the channel state measurement result may include the measured result information using the measurement configuration information of the available interval when the time point for channel state measurement belongs to the available interval. In this case, the channel state measurement result may include RSSI, reference signal received power (RSRP), or reference signal received quality (RSRQ) measurement information in a license-exempt band cell or frequency.
In another example, the channel status measurement result may include the measurement result information using the measurement configuration information of the unavailable interval when the time point for channel status measurement belongs to the unavailable interval. In this case, the channel state measurement result may include RSSI, energy detection or noise level measurement information in the license-exempt band cell or frequency.
As another example, it is possible to determine whether the channel state measurement result is an available period, and may include only measurement results (e.g., RSRP and RSRQ) for the channel state measured only in the available period. That is, the UE determines whether the corresponding license-exempted bandwidth cell is a usable period at a time point for channel state measurement, and can perform a channel state measurement operation only when the UE is in an available period.
In addition to this, the channel status measurement result includes RSSI, RSRP (Reference Signal), RSSI, Energy Detection, Noise Level Measurement, and RSRP, which are measured according to each interval measurement method set by the measurement configuration information, Received Power) and RSRQ (Reference Signal Received Quality) measurement results.
Also, the channel state measurement result may include a result of performing detailed operations such as layer 3 filtering according to each of the available section and the unavailable section of the license-exempt band cell.
If necessary, the channel state measurement result may include indication information indicating the type of the interval in which the channel state measurement is performed. The indication information may indicate information on the time point at which the measurement result of the corresponding channel condition is measured. As described with reference to Fig. 7, the indication information may be included in the channel state measurement result or may be separately received. The indication information may include information indicating whether the corresponding channel condition measurement result is measured in the available interval or in the unavailable interval. For example, the indication information may be set to 1 bit having values of 0 and 1, and each value may indicate an available section and an unavailable section of a license-exempt band cell.
In addition, the base station of the present invention can perform all the operations of the base station necessary for performing the above-described present invention.
9 and 10, a configuration of a terminal and a base station that performs all of the above-described present invention will be briefly described.
9 is a diagram for explaining a configuration of a terminal according to another embodiment of the present invention.
9, a
Receiving
In addition, as described above, the measurement configuration information may include information that is set differently according to the interval in which the channel state measurement is performed. For example, one or more of the measurement object, the measurement method, and the report condition for each of the channel state measurement sections may be set differently from the measurement configuration information.
In addition, the
The
In addition, the
In addition, the
The
In addition, the
10 is a diagram for explaining a configuration of a base station according to another embodiment of the present invention.
10, a
The
In addition, the
The
The receiving
For example, the channel state measurement result may include the measured result information using the measurement configuration information of the available interval when the time point for channel state measurement belongs to the available interval. In this case, the channel state measurement result may include RSSI, reference signal received power (RSRP), or reference signal received quality (RSRQ) measurement information in a license-exempt band cell or frequency.
In another example, the channel status measurement result may include the measurement result information using the measurement configuration information of the unavailable interval when the time point for channel status measurement belongs to the unavailable interval. In this case, the channel state measurement result may include RSSI, energy detection or noise level measurement information in the license-exempt band cell or frequency.
As another example, it is possible to determine whether the channel state measurement result is an available period, and may include only measurement results (e.g., RSRP and RSRQ) for the channel state measured only in the available period. That is, the UE determines whether the corresponding license-exempted bandwidth cell is a usable period at a time point for channel state measurement, and can perform a channel state measurement operation only when the UE is in an available period.
In addition to this, the channel status measurement result includes RSSI, RSRP (Reference Signal), RSSI, Energy Detection, Noise Level Measurement, and RSRP, which are measured according to each interval measurement method set by the measurement configuration information, Received Power) and RSRQ (Reference Signal Received Quality) measurement results. Also, the channel state measurement result may include a result of performing detailed operations such as layer 3 filtering according to each of the available section and the unavailable section of the license-exempt band cell.
The receiving
In addition, the
As described above, according to the present invention, the channel state measurement is separately performed for each section of the license-exempted band cell, the state of the corresponding frequency band on the terminal side can be accurately grasped and the license- Lt; / RTI > Further, the present invention provides the effect that the base station can grasp the utilization state (load information) of the corresponding license-exempted band frequency at the terminal location based on the reported measurement results, and can set an optimal license-exempt band cell for the terminal.
The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.
Claims (24)
Receiving measurement configuration information for channel state measurement of an unlicensed spectrum cell from a base station;
Measuring a channel state of the license-exempt band cell based on the type of the interval in which the channel state measurement is performed and the measurement configuration information; And
And transmitting a channel state measurement result of the license-exempt band cell to the base station,
Wherein the license-exempt band cell utilizes the frequency of the license-exempt band shared by one or more communication systems.
The type of the section in which the channel state measurement is performed is,
Wherein the unlicensed band cell is divided into an available period in which the license-exempt band frequency is available and an unavailable interval in which the license-exempt band cell is not available in the license-exclusion band frequency.
Wherein the measurement configuration information comprises:
Wherein the channel state information includes information set separately for each type of a section in which the channel state measurement is performed.
Wherein the measuring the channel condition comprises:
Wherein the channel state measurement operation is performed according to a type of the measurement configuration information and the interval in which the channel state measurement is performed, the channel state measurement operation being classified according to the type of the interval in which the channel status measurement is performed.
Wherein the measuring the channel state comprises: determining whether a period in which the channel state measurement is performed is an available period or an unavailable period; And
If the interval in which the channel state measurement is performed is a usable interval, measures a channel condition of the license-exempted bandwidth cell, and if the interval in which the channel condition measurement is performed is an unavailable interval, ≪ / RTI >
The channel state measurement result includes:
And indication information indicating a type of a section in which the channel state measurement is performed.
Setting measurement configuration information for channel state measurement of a license-unlicensed spectrum cell;
Transmitting the measurement configuration information; And
Receiving a channel state measurement result of the license-exempt band cell measured based on the type of the interval in which the channel state measurement is performed and the measurement configuration information,
Wherein the license-exempt band cell utilizes the frequency of the license-exempt band shared by one or more communication systems.
The type of the section in which the channel state measurement is performed is,
Wherein the unlicensed band cell is divided into an available period in which the license-exempt band frequency is available and an unavailable interval in which the license-exempt band cell is not available in the license-exclusion band frequency.
Wherein the measurement configuration information comprises:
Wherein the channel state measurement is performed separately for each type of the interval in which the channel state measurement is performed.
The channel state measurement result includes:
Wherein the measurement is performed according to a measurement operation that is classified based on the measurement configuration information and the type of a section in which the channel state measurement is performed, the measurement configuration information being classified according to the type of the section in which the channel state measurement is performed.
The channel state measurement result includes:
Wherein the channel state measurement includes only the measured result when the interval in which the channel state measurement is performed is an available interval.
The channel state measurement result includes:
And indication information indicating a type of a section in which the channel state measurement is performed.
A receiving unit for receiving measurement configuration information for channel status measurement of an unlicensed spectrum cell from a base station;
A controller for measuring a channel state of the license-exclusion band cell based on the type of the interval in which the channel status measurement is performed and the measurement configuration information; And
And a transmitter for transmitting a channel status measurement result of the license-exempt band cell to the base station,
Wherein the license-exempt band cell utilizes a frequency of an unlicensed band shared by one or more communication systems.
The type of the section in which the channel state measurement is performed is,
Wherein the unlicensed band cell is divided into an available period in which the license-exempt band frequency is available and an unavailable interval in which the license-exclusion band cell is not available in the license-exclusion band frequency.
Wherein the measurement configuration information comprises:
And the channel state information includes information set separately for each type of the period in which the channel state measurement is performed.
Wherein,
Wherein the channel state measurement operation is performed according to a type of the measurement configuration information and the interval in which the channel state measurement is performed, the channel state measurement operation being classified according to the type of the interval in which the channel status measurement is performed.
Wherein,
Determining whether an interval in which the channel state measurement is performed is an available interval or an unavailable interval,
If the interval in which the channel state measurement is performed is a usable interval, measures a channel condition of the license-exempted bandwidth cell, and if the interval in which the channel condition measurement is performed is an unavailable interval, .
The channel state measurement result includes:
And indication information indicating a type of a section in which the channel state measurement is performed.
A control unit for setting measurement configuration information for channel state measurement of an unlicensed spectrum cell;
A transmitter configured to transmit the measurement configuration information; And
And a receiving unit for receiving a channel state measurement result of the license-exempted band cell measured based on the type of the interval in which the channel state measurement is performed and the measurement configuration information,
Wherein the license-exempt band cell utilizes the frequency of the license-exempt band shared by one or more communication systems.
The type of the section in which the channel state measurement is performed is,
Wherein the unlicensed band cell is divided into an available period in which the license-exempt band frequency is available and an unavailable interval in which the license-exempt band cell is not available.
Wherein the measurement configuration information comprises:
And the channel state measurement is performed according to a type of a section in which the channel state measurement is performed.
The channel state measurement result includes:
Wherein the measurement is performed according to a measurement operation that is classified based on the measurement configuration information and the type of a section in which the channel state measurement is performed, the measurement configuration information being classified according to the type of the section in which the channel state measurement is performed.
The channel state measurement result includes:
Wherein the channel condition measurement includes only a measurement result when the interval in which the channel condition measurement is performed is an available interval.
The channel state measurement result includes:
And indication information indicating a type of a section in which the channel state measurement is performed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/KR2015/006479 WO2016013775A1 (en) | 2014-07-25 | 2015-06-25 | Channel state measuring method and device thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20140095000 | 2014-07-25 | ||
| KR1020140095000 | 2014-07-25 |
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| KR20160013506A true KR20160013506A (en) | 2016-02-04 |
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| KR1020150081830A KR20160013506A (en) | 2014-07-25 | 2015-06-10 | Methods for measuring a channel status and Apparatuses thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017150911A1 (en) * | 2016-03-02 | 2017-09-08 | Samsung Electronics Co., Ltd. | Method and apparatus for uplink channel accessin wireless communication system |
| WO2020045874A1 (en) * | 2018-08-30 | 2020-03-05 | Lg Electronics Inc. | Method and apparatus for restricting measurement based on result of a reference measurement in wireless communication system |
| WO2020096274A1 (en) * | 2018-11-08 | 2020-05-14 | 엘지전자 주식회사 | Method for reporting channel state information in unlicensed band and device for same |
| US10868619B2 (en) | 2017-06-29 | 2020-12-15 | Lg Electronics Inc. | Method and user equipment for performing measurement, and method and base station for configuring measurement |
-
2015
- 2015-06-10 KR KR1020150081830A patent/KR20160013506A/en unknown
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017150911A1 (en) * | 2016-03-02 | 2017-09-08 | Samsung Electronics Co., Ltd. | Method and apparatus for uplink channel accessin wireless communication system |
| US10349392B2 (en) | 2016-03-02 | 2019-07-09 | Samsung Electronics Co., Ltd. | Method and apparatus for uplink channel accessing wireless communication system |
| US10868619B2 (en) | 2017-06-29 | 2020-12-15 | Lg Electronics Inc. | Method and user equipment for performing measurement, and method and base station for configuring measurement |
| WO2020045874A1 (en) * | 2018-08-30 | 2020-03-05 | Lg Electronics Inc. | Method and apparatus for restricting measurement based on result of a reference measurement in wireless communication system |
| US11564118B2 (en) | 2018-08-30 | 2023-01-24 | Lg Electronics Inc. | Method and apparatus for restricting measurement based on result of a reference measurement in wireless communication system |
| WO2020096274A1 (en) * | 2018-11-08 | 2020-05-14 | 엘지전자 주식회사 | Method for reporting channel state information in unlicensed band and device for same |
| US11979348B2 (en) | 2018-11-08 | 2024-05-07 | Lg Electronics Inc. | Method for reporting channel state information in unlicensed band and device for same |
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