WO2017000263A1 - Procédé et dispositif d'émission de signal de référence - Google Patents

Procédé et dispositif d'émission de signal de référence Download PDF

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Publication number
WO2017000263A1
WO2017000263A1 PCT/CN2015/083004 CN2015083004W WO2017000263A1 WO 2017000263 A1 WO2017000263 A1 WO 2017000263A1 CN 2015083004 W CN2015083004 W CN 2015083004W WO 2017000263 A1 WO2017000263 A1 WO 2017000263A1
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WIPO (PCT)
Prior art keywords
time domain
cell
synchronization signal
domain symbols
user equipment
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PCT/CN2015/083004
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English (en)
Chinese (zh)
Inventor
马瑞泽大卫
官磊
马莎
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2015/083004 priority Critical patent/WO2017000263A1/fr
Priority to CN201580074671.5A priority patent/CN107210879B/zh
Publication of WO2017000263A1 publication Critical patent/WO2017000263A1/fr

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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

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a reference signal transmitting method and apparatus.
  • the spectrum deployed by the serving cell of the Long Term Evolution (LTE) system is the licensed spectrum, and the licensed spectrum is the spectrum that can be used after being purchased. Since the unlicensed spectrum is a spectrum that can be used without being purchased, the operation is performed. It is desirable to deploy a secondary serving cell of the unlicensed spectrum in the LTE system, so that the secondary serving cell of the unlicensed spectrum and the serving cell of the licensed spectrum perform carrier aggregation to serve the user equipment (User Equipment, UE).
  • An LTE system in which a secondary serving cell of an unlicensed spectrum is deployed may be referred to as an Unlicensed LTE (U-LTE) system.
  • U-LTE Unlicensed LTE
  • the base station Before the base station sends a signal on the channel where the secondary serving cell is located, it is required to perform Clear Channel Assessment (CCA) on the channel where the secondary serving cell is located according to the Listen-Before-Talk (LBT) principle.
  • CCA Clear Channel Assessment
  • LBT Listen-Before-Talk
  • the base station cannot temporarily transmit a signal on the channel; until the channel is found to be idle, the base station can send a signal on the channel, or the base station needs to perform a random backoff for a period of time, only in the fallback
  • the channel is idle during the time before the signal can be sent on the channel.
  • the Discovery Reference Signal is usually found by the Extended Synchronization Signal (PSS), the Secondary Synchronization Signal (SSS), and the Cell-specific Reference Signal (CRS). )composition.
  • PSS Extended Synchronization Signal
  • SSS Secondary Synchronization Signal
  • CRS Cell-specific Reference Signal
  • the base station performs CCA before the secondary serving cell sends the DRS, and finds that the channel of the base station to the UE is idle, the base station sends the DRS to the UE, but the base station may not currently have data to send to the UE.
  • the idle period of the (Orthogonal Frequency Division Multiplexing, OFDM) symbol, one OFDM symbol is about 70 microseconds long, and two to three OFDM symbols is 140 to 210 microseconds.
  • the wireless Fidelity (WI-FI) device or other carrier's U-LTE base station has a CCA window of about 10 microseconds, and during the idle period of 140 to 210 microseconds, other nearby WI-FI devices or The U-LTE base station of other operators starts to transmit information according to the CCA detection that the channel is idle.
  • the data scheduling is to occupy the time domain resources continuously. Since the idle time period is short and due to the LBT constraint, the neighboring WI-FI device or the U-LTE base station of other operators does not perform normal data scheduling at the current base station. Send a message.
  • the idle period between adjacent CRS symbols is energy-filled, and the padding signal may be a random signal or an existing reference signal.
  • performing energy filling results in a decrease in the utilization of unlicensed spectrum resources and affects the use of unlicensed spectrum resources by other devices.
  • Embodiments of the present invention provide a reference signal transmitting method and apparatus, which can accurately estimate RSSI and effectively improve utilization of spectrum resources.
  • a method for transmitting a reference signal including:
  • the first set of time domain symbols comprising a time domain symbol carrying a primary synchronization signal and a time domain symbol carrying a secondary synchronization signal
  • the second set of time domain symbols Include a time domain symbol carrying a cell-specific reference signal, and all of the time domain symbols included in the first set of time domain symbols and the second set of time domain symbols are consecutive in a time domain;
  • the primary synchronization signal and the secondary synchronization signal are transmitted in a first bandwidth of the first group of time domain symbols, or when the first cell is in a dormant state.
  • the primary synchronization signal and the secondary synchronization signal are transmitted in a second bandwidth of the first set of time domain symbols, the first bandwidth is smaller than the second bandwidth, and at least two are transmitted in the second bandwidth.
  • the primary synchronization signal and the secondary synchronization signal transmitted in the first bandwidth, the dormant state is that the first cell has no data transmission and has a first reference signal transmission, and the open state is the first
  • the cell has data or/and the first reference signal and the second reference signal, and the first cell is a secondary serving cell of the unlicensed spectrum or a serving cell of the licensed spectrum.
  • the method before the sending the first set of time domain symbols and the second set of time domain symbols to a user equipment, the method further includes:
  • the method After the sending the first group of time domain symbols and the second group of time domain symbols to the user equipment, the method also includes:
  • the time domain symbol is an orthogonal frequency division multiplexing OFDM symbol.
  • a reference signal receiving method including:
  • the base station Receiving a first group of time domain symbols and a second group of time domain symbols sent by the base station, where the first group of time domain symbols includes a time domain symbol carrying a primary synchronization signal and a time domain symbol carrying a secondary synchronization signal, the second group The time domain symbol includes a time domain symbol carrying a cell-specific reference signal, and all of the time domain symbols included in the first group of time domain symbols and the second group of time domain symbols are consecutive in a time domain;
  • the first bandwidth is smaller than the second bandwidth, and the primary synchronization signal and the secondary synchronization signal transmitted in at least two of the first bandwidths are transmitted in the second bandwidth, where the dormant state is the first a cell has no data transmission and has a first reference signal transmission, and the open state is that the first cell has data or/and the first reference signal and the second reference signal are transmitted, and the first cell is an unlicensed spectrum.
  • the secondary serving cell or the serving cell of the licensed spectrum is the primary synchronization signal and the secondary synchronization signal transmitted in at least two of the first bandwidths are transmitted in the second bandwidth
  • the determining that the first cell is in an open state includes:
  • determining that the first cell is in a dormant state includes:
  • the method before the receiving the first group of time domain symbols and the second group of time domain symbols sent by the base station, the method further includes:
  • the base station And receiving, by the base station, a first configuration message and a second configuration message, where the first configuration message is used to indicate that the user equipment configures a radio resource management measurement of a first frequency point, where the second configuration message is used to notify the The user equipment configures a time window for the user equipment, where the first frequency point is a frequency point where the first cell is located.
  • the method further includes:
  • a base station including:
  • a processing unit configured to generate a first group of time domain symbols and a second group of time domain symbols, where the first group of time domain symbols includes a time domain symbol carrying a primary synchronization signal and a time domain symbol carrying a secondary synchronization signal, where The two sets of time domain symbols include time domain symbols carrying cell specific reference signals, and all time domain symbols included in the first set of time domain symbols and the second set of time domain symbols are consecutive in time domain;
  • a sending unit configured to send the first group of time domain symbols and the second group of time domain symbols to a user equipment
  • the primary synchronization signal and the secondary synchronization signal are transmitted in a first bandwidth of the first group of time domain symbols, or when the first cell is in a dormant state.
  • the primary synchronization signal and the secondary synchronization signal are transmitted in a second bandwidth of the first set of time domain symbols, the first bandwidth is smaller than the second bandwidth, and at least two are transmitted in the second bandwidth.
  • the primary synchronization signal and the secondary synchronization signal transmitted in the first bandwidth, the dormant state is that the first cell has no data transmission and has a first reference signal transmission, and the open state is the first
  • the cell has data or/and the first reference signal and the second reference signal, and the first cell is a secondary serving cell of the unlicensed spectrum or a serving cell of the licensed spectrum.
  • the processing unit is further configured to:
  • the sending unit is further configured to:
  • the sending unit is further configured to:
  • the time domain symbol is an orthogonal frequency division multiplexing OFDM symbol.
  • a user equipment including:
  • a receiving unit configured to receive a first group of time domain symbols and a second group of time domain symbols sent by the base station, where the first group of time domain symbols includes a time domain symbol carrying a primary synchronization signal and a time domain symbol carrying a secondary synchronization signal,
  • the second set of time domain symbols includes a time domain symbol carrying a cell-specific reference signal, and all of the time domain symbols included in the first set of time domain symbols and the second set of time domain symbols are consecutive in a time domain;
  • a processing unit configured to determine that the first cell is in an on state, and the primary synchronization signal and the secondary synchronization signal occupy a first bandwidth of the first group of time domain symbols
  • the first bandwidth is smaller than the second bandwidth, and the primary synchronization signal and the secondary synchronization signal transmitted in at least two of the first bandwidths are transmitted in the second bandwidth, where the dormant state is the first a cell has no data transmission and has a first reference signal transmission, and the open state is that the first cell has data or/and the first reference signal and the second reference signal are transmitted, and the first cell is an unlicensed spectrum.
  • the secondary serving cell or the serving cell of the licensed spectrum is the primary synchronization signal and the secondary synchronization signal transmitted in at least two of the first bandwidths are transmitted in the second bandwidth
  • the processing unit is specifically configured to:
  • the receiving unit is further configured to:
  • the base station And receiving, by the base station, a first configuration message and a second configuration message, where the first configuration message is used to indicate that the user equipment configures a radio resource management measurement of a first frequency point, where the second configuration message is used to notify the The user equipment configures a time window for the user equipment, where the first frequency point is a frequency point where the first cell is located.
  • the processing unit is further configured to:
  • a base station including:
  • a processor configured to generate a first set of time domain symbols and a second set of time domain symbols, where the first set of time domain symbols includes a time domain symbol carrying a primary synchronization signal and a time domain symbol carrying a secondary synchronization signal, where The two sets of time domain symbols include time domain symbols carrying cell specific reference signals, and all time domain symbols included in the first set of time domain symbols and the second set of time domain symbols are consecutive in time domain;
  • a transmitter configured to send the first set of time domain symbols and the second set of time domain symbols to a user equipment
  • the primary synchronization signal and the secondary synchronization signal are transmitted in a first bandwidth of the first group of time domain symbols, or when the first cell is in a dormant state.
  • the primary synchronization signal and the secondary synchronization signal are transmitted in a second bandwidth of the first set of time domain symbols, the first bandwidth is smaller than the second bandwidth, and at least two are transmitted in the second bandwidth.
  • the primary synchronization signal and the secondary synchronization signal transmitted in the first bandwidth, the dormant state is that the first cell has no data transmission and has a first reference signal transmission, and the open state is the first The cell has data or / and the first reference
  • the test signal and the second reference signal transmission, the first cell is a secondary serving cell of the unlicensed spectrum or a serving cell of the licensed spectrum.
  • the processor is further configured to:
  • the transmitter is further configured to:
  • any one of the first to the second implementation manners in a third implementation manner, is further configured to:
  • the time domain symbol is an orthogonal frequency division multiplexing OFDM symbol.
  • a user equipment including:
  • a receiver configured to receive a first group of time domain symbols and a second group of time domain symbols sent by the base station, where the first group of time domain symbols includes a time domain symbol carrying a primary synchronization signal and a time domain symbol carrying a secondary synchronization signal,
  • the second set of time domain symbols includes a time domain symbol carrying a cell-specific reference signal, and all of the time domain symbols included in the first set of time domain symbols and the second set of time domain symbols are consecutive in a time domain;
  • a processor configured to determine that the first cell is in an on state, and the primary synchronization signal and the secondary synchronization signal occupy a first bandwidth of the first set of time domain symbols
  • the first bandwidth is smaller than the second bandwidth, and the primary synchronization signal and the secondary synchronization signal transmitted in at least two of the first bandwidths are transmitted in the second bandwidth,
  • the dormant state is that the first cell has no data transmission and has a first reference signal transmission
  • the open state is that the first cell has data or/and the first reference signal and the second reference signal transmission
  • the A cell is a secondary serving cell of an unlicensed spectrum or a serving cell of a licensed spectrum.
  • the processor is specifically configured to:
  • the receiver is further configured to:
  • the base station And receiving, by the base station, a first configuration message and a second configuration message, where the first configuration message is used to indicate that the user equipment configures a radio resource management measurement of a first frequency point, where the second configuration message is used to notify the The user equipment configures a time window for the user equipment, where the first frequency point is a frequency point where the first cell is located.
  • the processor is further configured to:
  • Embodiments of the present invention provide a reference signal transmitting method and apparatus.
  • energy filling is performed during an idle period between adjacent CRS symbols to transmit a reference signal.
  • the primary synchronization signal and the secondary synchronization signal are transmitted in the first bandwidth of the first group of time domain symbols, or when the first cell is in the sleep state, the primary synchronization signal And the secondary synchronization signal is transmitted in a second bandwidth of the first set of time domain symbols, the first bandwidth being less than the second bandwidth, and the second bandwidth transmitting the at least two of the a primary synchronization signal and the secondary synchronization signal, thereby transmitting a primary synchronization signal through different bandwidths according to different states of the cell
  • the secondary synchronization signal can accurately estimate the RSSI and effectively improve the utilization of spectrum resources.
  • FIG. 1 is a schematic diagram of a reference signal transmission provided by the prior art
  • FIG. 2 is a schematic diagram of a time-frequency position of a reference signal according to the prior art
  • FIG. 3 is a flowchart of a method for sending a reference signal according to an embodiment of the present invention
  • FIG. 4 is a flowchart of another method for transmitting a reference signal according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of still another method for transmitting a reference signal according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of another base station according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of another user equipment according to an embodiment of the present invention.
  • the base station transmits data and reference signals to the user equipment through the OFDMA time-frequency resources.
  • the data and the reference signal are transmitted according to the scheduling information sent by the base station.
  • the base station sends a control channel, where the control channel can carry scheduling information of the uplink data channel or the downlink data channel, where the scheduling information includes The control information such as the resource allocation information and the modulation and coding mode, the user equipment performs the downlink data channel reception or the uplink data channel transmission according to the scheduling information carried in the control channel.
  • time-frequency resources are divided into OFDM in the time domain dimension
  • the OFDM subcarriers in the symbol and frequency domain dimensions the smallest resource granularity is the Resource Element (RE), that is, the time-frequency grid point representing one OFDM symbol in the time domain and one OFDM subcarrier in the frequency domain.
  • the base station scheduling user equipment usually performs the resource block pair (RBP) granularity.
  • RBP resource block pair
  • One resource block pair occupies the length of one subframe in the time domain, and the width of the 12 OFDM subcarriers in the frequency domain, one The subframe includes 14 OFDM symbols.
  • the user equipment In order to maintain data transmission, or perform cell selection, reselection or handover, the user equipment needs to perform synchronization, cell identification, and radio resource management (RRM) measurement with the base station according to the reference signal sent by the base station.
  • the synchronization is further divided into initial coarse synchronization and time-frequency tracking fine synchronization.
  • the initial coarse synchronization is completed according to the PSS and SSS sent by the base station, and the time-frequency tracking fine synchronization is completed by the CRS sent by the base station.
  • Radio resource management measurements include measurements such as RSRP, RSRQ, and RSSI, which are currently done through CRS. As shown in FIG.
  • the reference signal time-frequency position diagram, the time-frequency position of the reference signal of the PSS, SSS, and CRS in the resource block pair shown in FIG. 2, the CRS of an antenna port is shown in FIG. A CRS including 2 or 4 antenna ports, and each subframe of the CRS on the carrier in the LTE active state is transmitted; the PSS/SSS transmission period is 5 ms.
  • a DRS is introduced based on the cell switching mechanism, and the DRS is composed of PSS/SSS and CRS, and the period of the DRS is long, and can be configured to be 40/80/160 ms, that is, the DRS is extended by the period.
  • PSS/SSS and CRS are composed for cell identification and RRM measurement.
  • the embodiment of the present invention provides a reference signal sending method, which is applied to a base station, as shown in FIG. 3, and includes:
  • Step 101 Generate a first set of time domain symbols and a second set of time domain symbols.
  • the first set of time domain symbols includes a time domain symbol carrying a primary synchronization signal and a time domain symbol carrying a secondary synchronization signal
  • the second set of time domain symbols includes a time domain symbol carrying a cell specific reference signal
  • the first The group time domain symbols and all time domain symbols included in the second set of time domain symbols are contiguous in the time domain. All of the time domain symbols included in the first set of time domain symbols and the second set of time domain symbols are consecutive in the time domain, and the first set of time domain symbols may be discontinuous, the second set of time domains
  • the symbol may not be continuous, but the The set of time domain symbols consisting of the first set of time domain symbols and the second set of time domain symbols is continuous.
  • Step 102 Send the first set of time domain symbols and the second set of time domain symbols to a user equipment.
  • the primary synchronization signal and the secondary synchronization signal are transmitted in a first bandwidth of the first group of time domain symbols, or when the first cell is in a dormant state.
  • the primary synchronization signal and the secondary synchronization signal are transmitted in a second bandwidth of the first set of time domain symbols, the first bandwidth is smaller than the second bandwidth, and at least two are transmitted in the second bandwidth.
  • the primary synchronization signal and the secondary synchronization signal transmitted in the first bandwidth, the dormant state is that the first cell has no data transmission and has a first reference signal transmission, and the open state is the first
  • the cell has data or/and the first reference signal and the second reference signal, and the first cell is a secondary serving cell of the unlicensed spectrum or a serving cell of the licensed spectrum.
  • energy filling is performed during an idle period between adjacent CRS symbols to transmit a reference signal.
  • the primary synchronization signal and the secondary synchronization signal are transmitted in the first bandwidth of the first group of time domain symbols, or when the first cell is in the sleep state, the primary synchronization signal And the secondary synchronization signal is transmitted in a second bandwidth of the first set of time domain symbols, the first bandwidth being less than the second bandwidth, and the second bandwidth transmitting the at least two of the The primary synchronization signal and the secondary synchronization signal, so that the primary synchronization signal and the secondary synchronization signal are transmitted through different bandwidths according to different states of the cell, can accurately estimate the RSSI, thereby effectively improving the utilization of the spectrum resources.
  • the embodiment of the present invention provides a reference signal receiving method, which is applied to a user equipment, as shown in FIG. 4, and includes:
  • Step 201 Receive a first group of time domain symbols and a second group of time domain symbols sent by the base station.
  • the first set of time domain symbols includes a time domain symbol carrying a primary synchronization signal and a time domain symbol carrying a secondary synchronization signal
  • the second set of time domain symbols includes a time domain symbol carrying a cell specific reference signal
  • Step 202 Determine that the first cell is in an open state, and the primary synchronization signal and the secondary synchronization signal occupy a first bandwidth of the first group of time domain symbols, or determine that the first cell is in a dormant state, and The primary synchronization signal and the secondary synchronization signal occupy a second bandwidth of the first set of time domain symbols.
  • the first bandwidth is smaller than the second bandwidth, and the primary synchronization signal and the secondary synchronization signal transmitted in at least two of the first bandwidths are transmitted in the second bandwidth, where the dormant state is the first a cell has no data transmission and has a first reference signal transmission, and the open state is that the first cell has data or/and the first reference signal and the second reference signal are transmitted, and the first cell is an unlicensed spectrum.
  • the secondary serving cell or the serving cell of the licensed spectrum is the primary synchronization signal and the secondary synchronization signal transmitted in at least two of the first bandwidths are transmitted in the second bandwidth
  • the present invention determines that the primary synchronization signal and the secondary synchronization signal are transmitted in the first bandwidth of the first group of time domain symbols when the cell is in the on state. Or, when the first cell is in the dormant state, the primary synchronization signal and the secondary synchronization signal are transmitted in the second bandwidth of the first group of time domain symbols, where the first bandwidth is smaller than the second bandwidth, and the second bandwidth is within the second bandwidth.
  • An embodiment of the present invention provides a reference signal sending method, as shown in FIG. 5, including:
  • Step 301 The base station sends a first configuration message and a second configuration message to the user equipment.
  • the first configuration message is used to indicate that the user equipment configures a radio resource management measurement of the first frequency point
  • the second configuration message is used to notify the user equipment to configure a time window for the user equipment, where the first The frequency point is the frequency point of the first cell.
  • Step 302 The user equipment receives the first configuration message and the second configuration message sent by the base station.
  • the first configuration message is used to indicate that the user equipment configures a radio resource management measurement of the first frequency point
  • the second configuration message is used to notify the user equipment to configure a time window for the user equipment, where the first The frequency point is the frequency point of the first cell.
  • the UE accesses the serving cell from the licensed spectrum, where the serving cell is a cell that grants a carrier on the spectrum.
  • the UE receives the first configuration information sent by the base station by using the serving cell, and configures the first frequency point of the secondary serving cell by using the first configuration information.
  • the base station may notify the UE to perform RRM measurement on the frequency of the unlicensed spectrum by using RRC dedicated signaling, where the frequency point may be the frequency of the secondary serving cell. It can also be other frequency points of the serving cell.
  • the UE may further receive, by using the serving cell, second configuration information that is sent by the base station, and configure, by using the second configuration information, a time window of the first frequency point, where the length of the time window may be 6 milliseconds (ms), and the first If all cells on the frequency point can occupy the channel, they need to send their respective DRSs in the common time window for the UE to perform detection and RRM measurement.
  • the time window is a set of time intervals in which a period occurs, for example, a period of 80 ms, and a time window of a measurement gap of 6 ms appears in each period.
  • Step 303 The base station performs an idle channel detection CCA on a channel of the base station to the first cell of the user equipment.
  • Step 304 The base station generates a first set of time domain symbols and a second set of time domain symbols.
  • the first set of time domain symbols includes a time domain symbol carrying a primary synchronization signal and a time domain symbol carrying a secondary synchronization signal
  • the second set of time domain symbols includes a time domain symbol carrying a cell specific reference signal
  • Step 305 The base station sends the first group time domain symbol and the second group time domain symbol to the user equipment.
  • the primary synchronization signal and the secondary synchronization signal are transmitted in a first bandwidth of the first group of time domain symbols, or when the first cell is in a dormant state.
  • the primary synchronization signal and the secondary synchronization signal are transmitted in a second bandwidth of the first set of time domain symbols, the first bandwidth is smaller than the second bandwidth, and at least two are transmitted in the second bandwidth.
  • the primary synchronization signal and the secondary synchronization signal transmitted in the first bandwidth, the dormant state is that the first cell has no data transmission and has a first reference signal transmission, and the open state is the first
  • the cell has data or/and the first reference signal and the second reference signal, and the first cell is an auxiliary device of the unlicensed spectrum.
  • a cell or a serving cell that grants spectrum.
  • the first reference signal is a DRS
  • the second reference signal is another reference signal (Reference Signal, RS).
  • Step 306 The user equipment receives the first group of time domain symbols and the second group of time domain symbols sent by the base station.
  • the first set of time domain symbols includes a time domain symbol carrying a primary synchronization signal and a time domain symbol carrying a secondary synchronization signal
  • the second set of time domain symbols includes a time domain symbol carrying a cell specific reference signal
  • Step 307 The user equipment determines a status of the first cell.
  • the state of the first cell is an open state or a dormant state, where the dormant state is that the first cell has no data transmission and has a first reference signal transmission, and the open state is that the first cell has data or/and The first reference signal and the second reference signal are transmitted.
  • the UE may receive the first indication message sent by the base station, receive the first indication message sent by the base station, determine, according to the first indication message, that the first cell is in an open state, and receive the sending by the base station. And the first indication message is determined, according to the first indication message, that the first cell is in a dormant state. For example by receiving indication information in a control channel on the serving cell.
  • the first bandwidth is smaller than the second bandwidth, and the primary synchronization signal and the secondary synchronization signal transmitted in at least two of the first bandwidths are transmitted in the second bandwidth, where the first cell is unauthorized.
  • Step 308 The user equipment performs synchronization and/or identification of the first cell according to the detected primary synchronization signal and the secondary synchronization signal.
  • the primary synchronization signal and the secondary synchronization signal occupy a first bandwidth of the first group of time domain symbols, and according to the detected primary synchronization signal and the secondary synchronization signal Performing synchronization and/or identification of the target cell
  • the synchronization signal performs synchronization and/or identification of the target cell.
  • Step 309 The user equipment performs radio resource management measurement on the first cell according to the detected cell-specific reference signal.
  • the first bandwidth is a narrowband bandwidth
  • the second bandwidth is a broadband bandwidth.
  • the primary synchronization signal and the secondary synchronization signal within the wideband bandwidth are frequency domain repeat replicas of the primary synchronization signal and the secondary synchronization signal within the narrowband bandwidth.
  • the narrowband bandwidth is a bandwidth of 6 resource blocks, and the transmitted PSS/SSS is a normal PSS/SSS; and the bandwidth of the carrier may be 20 MHz.
  • the first cell is in a dormant state, in order to satisfy the LBT principle on the unlicensed spectrum. That is, the transmitted signal should occupy at least 80% of the current carrier bandwidth, then the normal PSS/SSS needs to be extended to the entire carrier bandwidth.
  • the current narrowband transmitted PSS/SSS can be repeatedly extended in the frequency domain to at least the whole. 80% of the bandwidth may also be the frequency domain extended transmission of the SSS on the PSS symbol, and the frequency domain extended transmission of the PSS on the SSS symbol.
  • the PSS/SSS frequency domain is extended to ensure the LBT principle of the unlicensed spectrum is satisfied; when there is data transmission (such as the open state), the normal downlink data rate matching is maintained, And normal narrowband PSS/SSS transmission.
  • the primary synchronization signal and the secondary synchronization signal may be detected within a time window of the measurement gap.
  • the UE identifies the first cell and/or synchronizes the first cell according to the detected primary and secondary synchronization signals. And detecting the CRS of the first cell to perform RRM measurement on the first cell.
  • the time domain symbol of the PSS/SSS is continuous with the time domain symbol of the CRS, so as to prevent other neighboring nodes (WI-FI devices or U-LTE base stations) from starting in the idle gap between the current adjacent CRS symbols. Sending a signal causes the above RSSI overestimation problem.
  • the reference signal sending method according to the present invention is used in a wireless communication system, especially in a U-LTE system.
  • the mainstream deployment scenario is used by carrier aggregation of the serving cell on the licensed spectrum and the secondary serving cell on the unlicensed spectrum.
  • the serving cell and the secondary serving cell may be deployed in a common station, or may be a non-co-site deployment, and two There is an ideal return path between the service cells.
  • the present invention is not limited to the scenario of the above-mentioned carrier aggregation, and may also be deployed in a scenario where there is no ideal backhaul path between the two serving cells, for example, the backhaul delay is large, and the information cannot be quickly coordinated between the two serving cells.
  • a secondary serving cell that can be independently accessed may be deployed, that is, carrier aggregation with the serving cell is not required at this time.
  • a part of the time domain symbols may be intercepted from the original PSS/SSS and CRS to transmit the truncated PSS/SSS and CRS.
  • the PSS/SSS is still in symbol 0 and symbol 5 of subframe 0 or subframe 5 (the symbol order is ranked from 0)
  • the present invention only intercepts CRS symbols on one or both sides of the PSS/SSS, such as symbol 0 and/or symbol 7 of subframe 0 or subframe 5.
  • the specific PSS is located in the last symbol of the subframe 0 or the subframe 5, that is, the symbol 13, and The SSS is located in symbol 2 of subframe 1 or subframe 6.
  • the time domain symbol position of PSS/SSS unchanged, and ensure that there is a symbol CRS, that is, symbol 0 of subframe 1 or 6.
  • There is another time domain symbol between the symbols of the PSS/SSS that is, the symbol 1 of the subframe 1 or 6.
  • the symbol 1 There may be no CRS on the symbol 1, for example, the number of ports of the CRS is 1 or 2 (if the number of CRS ports is 4) , then there is also CRS) on the symbol 1, then the symbol 1 can be filled, such as filling an existing CRS or other reference signal or even a random signal.
  • the embodiment of the present invention provides a base station 40, as shown in FIG. 6, including:
  • the processing unit 401 is configured to generate a first group of time domain symbols and a second group of time domain symbols, where the first group of time domain symbols includes a time domain symbol carrying a primary synchronization signal and a time domain symbol carrying a secondary synchronization signal,
  • the second set of time domain symbols includes a time domain symbol carrying a cell-specific reference signal, and all of the time domain symbols included in the first set of time domain symbols and the second set of time domain symbols are consecutive in time domain;
  • the sending unit 402 is configured to send, to the user equipment, the first group of time domain symbols and the second group of time domain symbols,
  • the primary synchronization signal and the secondary synchronization signal are transmitted in a first bandwidth of the first group of time domain symbols, or when the first cell is in a dormant state.
  • the primary synchronization signal and the secondary synchronization signal are transmitted in a second bandwidth of the first set of time domain symbols, the first bandwidth is smaller than the second bandwidth, and at least two are transmitted in the second bandwidth.
  • the primary synchronization signal and the secondary synchronization signal transmitted in the first bandwidth, the dormant state is that the first cell has no data transmission and has a first reference signal transmission, and the open state is the first
  • the cell has data or/and the first reference signal and the second reference signal, and the first cell is a secondary serving cell of the unlicensed spectrum or a serving cell of the licensed spectrum.
  • energy filling is performed during an idle period between adjacent CRS symbols to transmit a reference signal.
  • the primary synchronization signal and the secondary synchronization signal are transmitted in the first bandwidth of the first group of time domain symbols, or when the first cell is in the sleep state, the primary synchronization signal And the secondary synchronization signal is transmitted in a second bandwidth of the first set of time domain symbols, the first bandwidth being less than the second bandwidth, and the second bandwidth transmitting the at least two of the The primary synchronization signal and the secondary synchronization signal, so that the primary synchronization signal and the secondary synchronization signal are transmitted through different bandwidths according to different states of the cell, can accurately estimate the RSSI, thereby effectively improving the utilization of the spectrum resources.
  • the processing unit 401 is further configured to:
  • the sending unit 402 is further configured to:
  • the time domain symbols are orthogonal frequency division multiplexed OFDM symbols.
  • An embodiment of the present invention provides a user equipment 50, as shown in FIG. 7, including:
  • the receiving unit 501 is configured to receive the first group of time domain symbols and the second group sent by the base station a time domain symbol, the first set of time domain symbols including a time domain symbol carrying a primary synchronization signal and a time domain symbol carrying a secondary synchronization signal, the second set of time domain symbols including a time domain symbol carrying a cell specific reference signal, All of the time domain symbols included in the first set of time domain symbols and the second set of time domain symbols are consecutive in time domain;
  • the processing unit 502 is configured to determine that the first cell is in an on state, and the primary synchronization signal and the secondary synchronization signal occupy a first bandwidth of the first group of time domain symbols,
  • the first bandwidth is smaller than the second bandwidth, and the primary synchronization signal and the secondary synchronization signal transmitted in at least two of the first bandwidths are transmitted in the second bandwidth, where the dormant state is the first a cell has no data transmission and has a first reference signal transmission, and the open state is that the first cell has data or/and the first reference signal and the second reference signal are transmitted, and the first cell is an unlicensed spectrum.
  • the secondary serving cell or the serving cell of the licensed spectrum is the primary synchronization signal and the secondary synchronization signal transmitted in at least two of the first bandwidths are transmitted in the second bandwidth
  • the present invention determines that the primary synchronization signal and the secondary synchronization signal are transmitted in the first bandwidth of the first group of time domain symbols when the cell is in the on state. Or, when the first cell is in the dormant state, the primary synchronization signal and the secondary synchronization signal are transmitted in the second bandwidth of the first group of time domain symbols, where the first bandwidth is smaller than the second bandwidth, and the second bandwidth is within the second bandwidth.
  • the processing unit 502 is specifically configured to:
  • the receiving unit 501 is further configured to:
  • the base station And receiving, by the base station, a first configuration message and a second configuration message, where the first configuration message is used to indicate that the user equipment configures a radio resource management measurement of a first frequency point, where the second configuration message is used to notify the The user equipment configures a time window for the user equipment, where the first frequency point is a frequency point where the first cell is located.
  • the processing unit 502 is further configured to:
  • An embodiment of the present invention provides a base station 60, as shown in FIG. 8, including:
  • the processor 601 is configured to generate a first group of time domain symbols and a second group of time domain symbols, where the first group of time domain symbols includes a time domain symbol carrying a primary synchronization signal and a time domain symbol carrying a secondary synchronization signal,
  • the second set of time domain symbols includes a time domain symbol carrying a cell-specific reference signal, and all of the time domain symbols included in the first set of time domain symbols and the second set of time domain symbols are consecutive in time domain;
  • a transmitter 602 configured to send, to the user equipment, the first set of time domain symbols and the second set of time domain symbols,
  • the primary synchronization signal and the secondary synchronization signal are transmitted in a first bandwidth of the first group of time domain symbols, or when the first cell is in a dormant state.
  • the primary synchronization signal and the secondary synchronization signal are transmitted in a second bandwidth of the first set of time domain symbols, the first bandwidth is smaller than the second bandwidth, and at least two are transmitted in the second bandwidth.
  • the primary synchronization signal and the secondary synchronization signal transmitted in the first bandwidth, the dormant state is that the first cell has no data transmission and has a first reference signal transmission, and the open state is the first
  • the cell has data or/and the first reference signal and the second reference signal, and the first cell is a secondary serving cell of the unlicensed spectrum or a serving cell of the licensed spectrum.
  • energy filling is performed during an idle period between adjacent CRS symbols to transmit a reference signal.
  • the primary synchronization signal and the secondary synchronization signal are transmitted in the first bandwidth of the first group of time domain symbols, Or, when the first cell is in a dormant state, the primary synchronization signal and the secondary synchronization signal are transmitted in a second bandwidth of the first group of time domain symbols, where the first bandwidth is smaller than the second bandwidth, and the second bandwidth is Transmitting the primary synchronization signal and the secondary synchronization signal transmitted in at least two of the first bandwidths, so that the primary synchronization signal and the secondary synchronization signal are transmitted through different bandwidths according to different states of the cell, and the RSSI can be accurately estimated, thereby effectively improving Utilization of spectrum resources.
  • the processor 601 is further configured to:
  • the transmitter 602 is also used to:
  • the transmitter 602 is also used to:
  • the time domain symbols are orthogonal frequency division multiplexed OFDM symbols.
  • An embodiment of the present invention provides a user equipment 70, as shown in FIG. 9, including:
  • the receiver 701 is configured to receive a first group of time domain symbols and a second group of time domain symbols sent by the base station, where the first group of time domain symbols includes a time domain symbol carrying a primary synchronization signal and a time domain symbol carrying a secondary synchronization signal.
  • the second set of time domain symbols includes a time domain symbol carrying a cell-specific reference signal, and all of the time domain symbols included in the first set of time domain symbols and the second set of time domain symbols are consecutive in time domain ;
  • the processor 702 is configured to determine that the first cell is in an on state, and the primary synchronization signal and the secondary synchronization signal occupy a first bandwidth of the first group of time domain symbols,
  • the first bandwidth is smaller than the second bandwidth, and at least two are transmitted in the second bandwidth.
  • the primary synchronization signal and the secondary synchronization signal transmitted in the first bandwidth, the sleep state is that the first cell has no data transmission and has a first reference signal transmission
  • the open state is the A cell has data or/and the first reference signal and a second reference signal
  • the first cell is a secondary serving cell of an unlicensed spectrum or a serving cell of a licensed spectrum.
  • the present invention determines that the primary synchronization signal and the secondary synchronization signal are transmitted in the first bandwidth of the first group of time domain symbols when the cell is in the on state. Or, when the first cell is in the dormant state, the primary synchronization signal and the secondary synchronization signal are transmitted in the second bandwidth of the first group of time domain symbols, where the first bandwidth is smaller than the second bandwidth, and the second bandwidth is within the second bandwidth.
  • the processor 702 is specifically configured to:
  • the receiver 701 is further configured to:
  • the base station And receiving, by the base station, a first configuration message and a second configuration message, where the first configuration message is used to indicate that the user equipment configures a radio resource management measurement of a first frequency point, where the second configuration message is used to notify the The user equipment configures a time window for the user equipment, where the first frequency point is a frequency point where the first cell is located.
  • the processor 702 is further configured to:
  • the disclosed apparatus and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may be physically included separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.
  • the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed.
  • the foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention se rapporte au domaine des communications sans fil. Conformément à un mode de réalisation, la présente invention concerne un procédé et un dispositif d'émission de signal de référence. L'invention peut prédire de manière précise un RSSI et augmenter de manière efficace l'utilisation de ressources de spectre de fréquence, et consiste : à générer un premier ensemble de symboles de domaine temporel et un second ensemble de symboles de domaine temporel, le premier ensemble de symboles de domaine temporel comprenant un symbole de domaine temporel transportant un signal de synchronisation primaire (PSS) et un symbole de domaine temporel transportant un signal de synchronisation secondaire (SSS), et le second ensemble de symboles de domaine temporel comprenant un symbole de domaine temporel transportant un signal de référence spécifique à une cellule ; à émettre à un équipement utilisateur le premier ensemble de symboles de domaine temporel et le second ensemble de symboles de domaine temporel ; lorsqu'une première cellule est activée, à émettre le PSS et le SSS dans une première bande passante du premier ensemble de symboles de domaine temporel ; ou, lorsque la première cellule est dormante, émettre le PSS et le SSS dans une seconde bande passante du premier ensemble de symboles de domaine temporel. Le procédé et le dispositif d'émission de signal de référence sont utilisés pour émettre des signaux de référence.
PCT/CN2015/083004 2015-06-30 2015-06-30 Procédé et dispositif d'émission de signal de référence WO2017000263A1 (fr)

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CN201580074671.5A CN107210879B (zh) 2015-06-30 2015-06-30 一种参考信号发送方法及装置

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