WO2016119466A1 - Procédé et dispositif de traitement pour signal de découverte - Google Patents

Procédé et dispositif de traitement pour signal de découverte Download PDF

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WO2016119466A1
WO2016119466A1 PCT/CN2015/089193 CN2015089193W WO2016119466A1 WO 2016119466 A1 WO2016119466 A1 WO 2016119466A1 CN 2015089193 W CN2015089193 W CN 2015089193W WO 2016119466 A1 WO2016119466 A1 WO 2016119466A1
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ucds
transmission
period
subframe
signal
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PCT/CN2015/089193
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English (en)
Chinese (zh)
Inventor
徐汉青
赵亚军
莫林梅
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中兴通讯股份有限公司
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Priority claimed from CN201510170359.8A external-priority patent/CN106162922B/zh
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP15879664.9A priority Critical patent/EP3253165A4/fr
Priority to US15/546,855 priority patent/US10555243B2/en
Publication of WO2016119466A1 publication Critical patent/WO2016119466A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to the field of communications, and in particular to a method and apparatus for processing a discovery signal.
  • LTE-U Long Term Evolution – Unlicensed
  • WiFi Wireless Fidelity
  • LTE-U Long Term Evolution – Unlicensed
  • the LTE-U system may also be referred to as an LTE Licensed Assisted Access (LAA) system.
  • LAA LTE Licensed Assisted Access
  • the LBT/CCA will restrict the LAA reference signal from being sent before occupying the unlicensed carrier.
  • ETSI European Telecommunications Standards Institute
  • SCS Short Control Signalling
  • management and control frames eg ACK/NACK signals
  • SCS transmission has strict limits: if SCS is used, the short signaling transmission duty of the adaptive device does not exceed 5%, which is 2.5 ms, during the observation period of 50 ms.
  • the use of unlicensed carriers also needs to solve the problems of cell discovery, synchronization, and radio resource management (Radio Resource Management, RRM for short).
  • the discovery signal (Discovery Signal, DS for short) defined by 3GPP Rel-12 can be used as a research reference. .
  • the DS composition defined by Rel-12 is: Primary/Secondary Synchronization Signal (PSS/SSS) and Cell-specific Reference Signal (Cell-specific Reference Signal, referred to as CRS), Channel State Information-Reference Signal (CSI-RS) can be configured.
  • PSS/SSS Primary/Secondary Synchronization Signal
  • CRS Cell-specific Reference Signal
  • CSI-RS Channel State Information-Reference Signal
  • the DS duration in each cycle in Frequency Division Duplex (FDD) mode can be 1 to 5 consecutive subframes.
  • the DS duration can be 2 to 5 consecutive subframes in Time Division Duplex (TDD) mode.
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • the CRS is transmitted through the antenna port 0 on all the downlink subframes and the downlink subframe part of the special subframe (DwPTS).
  • the PSS is transmitted on the first subframe of each cycle of the FDD or the second subframe of each cycle of the TDD.
  • the SSS is sent on the first subframe of each cycle.
  • the non-zero-power CSI-RS is transmitted on zero or more subframes per cycle.
  • the existing DS duration is at least 1 subframe.
  • the CRS occupies the symbol 0, the symbol 4, the symbol 7 and the symbol 11, the SSS occupies the symbol 5, the PSS occupies the symbol 6, and the CSI-RS can Match. If CSI-RS is not configured, the DS spans at least 12 symbols and actually occupies at least 6 symbols.
  • the existing DS duration is at least 2 subframes, and in these 2 subframes, the CRS occupies symbol 0, symbol 4, symbol 7, and symbol 11 in the first subframe and the second subframe.
  • the SSS occupies the symbol 13 of the first subframe.
  • the PSS occupies the symbol 2 of the second subframe.
  • the CSI-RS can be configured. If the CSI-RS is not configured, the DS spans at least 26 symbols, and it actually occupies at least 10 symbols.
  • the use of unlicensed carriers has its particularity. There is a limitation of the LBT/CCA mechanism and the maximum occupied duration before use.
  • the DS internal multi-symbol discontinuous transmission involves multiple occupations (if sent by symbol) or occupied for too long (once).
  • the problem of reserving the entire DS duration and the need to send an occupied or reserved signal requires redesigning the pattern of the discovered signal to reduce the number of occupations or the duration of the occupation.
  • SCS For SCS transmission mode without LBT/CCA in Europe, SCS has strict time requirements, that is, within 50 ms observation period, the short signaling transmission duty of adaptive devices does not exceed 5%, which is 2.5 ms. This also requires reducing the length of DS occupancy, and the discontinuous transmission of multiple symbols within the DS also causes multiple interferences to users who are competing for resources or occupied resources. Therefore, it is also necessary to redesign the pattern of the discovery signal to reduce the occupation time and avoid causing multiple interferences to other devices, and at the same time let a part of the SCS resources be used for other necessary short signaling.
  • the discovery signal in the unlicensed carrier in the related art needs to be redesigned, and the resource occupancy of the discovery signal is minimized and multiple interference is avoided under the premise of satisfying and matching the special requirements of the unlicensed carrier. The problem arises.
  • the embodiments of the present invention provide a method and a device for processing a discovery signal, so as to solve at least the problem that the discovery signal in the related art is applied to an unlicensed carrier, and the problem of redesigning the discovery signal is required.
  • a method of processing a discovery signal is provided.
  • the processing method for the discovery signal includes: performing at least one of the following operations on each component signal of the discovery signal: determining a configuration manner of each component signal; performing pattern modification on each component signal; determining each component signal or modifying through the pattern The subsequent transmission method of each component signal.
  • performing pattern modification on each component signal comprises: selecting and retaining symbols of adjacent or similar time domains in each component signal according to existing time-frequency resource locations of each component signal to form a discovery signal (UCDS) in the unlicensed carrier.
  • the transmission is performed; or, the time-frequency resource positions of the constituent signals are modified so that the constituent signals are adjacent or close to each other in the time domain, and the modified symbols are used to form the UCDS for transmission.
  • UCDS discovery signal
  • modifying the time-frequency resource location of each component signal comprises: modifying a time domain location of each component signal.
  • the UCDS comprises at least one of: a primary synchronization signal (PSS); a secondary synchronization signal (SSS); a cell-specific reference signal (CRS); a channel state information-reference signal (CSI-RS); a position reference signal (PRS)
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • CRS cell-specific reference signal
  • CSI-RS channel state information-reference signal
  • PRS position reference signal
  • PSS, SSS, CRS, and PRS are used for cell discovery and/or synchronization
  • CRS and CSI-RS are used for radio resource management (RRM) measurements and/or CSI measurements.
  • RRM radio resource management
  • the UCDS comprises a modified form of a single signal or a modified form of at least two signals in the PSS, SSS, CRS, PRS, CRS and CSI-RS.
  • the sending manner includes one of the following: periodic sending; aperiodic triggering sending; and periodic sending and hybrid sending in combination with aperiodic triggering.
  • the transmitting manner further includes: switching between a conventional discovery signal transmission mode of each component signal and a UCDS transmission mode of each component signal after the pattern modification.
  • the periodic transmission includes one of: transmitting UCDS at each periodic point by short control signaling (SCS); transmitting UCDS normally at the current periodic point in the case of competing to an unlicensed carrier; In the case of an unlicensed carrier, the UCDS is stopped once at the current cycle point, and waits for the next cycle point. If the unlicensed carrier has not been contending at the next cycle point, the UCDS continues to be sent once; In the case of a carrier, the UCDS is normally transmitted at the current periodic point; if the unlicensed carrier is not contending, the UCDS is stopped once at the current periodic point, and the UCDS is supplementally transmitted after the next time the non-authorized carrier is contending. , supplemental transmission UCDS is sent for irregular periods.
  • SCS short control signaling
  • the periodic transmission includes one of the following: the UCDS is sent according to the preset transmission parameter set by the LBT or the idle channel evaluation C-A, wherein the preset transmission parameter set includes at least one of the following: period, offset, and duration. Time, number of bursts; in the case of competing to an unlicensed carrier, transmitting UCDS at the current point in time; in the case of not competing to an unlicensed carrier, stopping sending UCDS once at the current period, and at the next point in time In the previous time period, if the content is re-competed to the unlicensed carrier, the UCDS continues to be sent, wherein the UCDS continues to be sent in an irregular periodic transmission, and the next time point is after the current time point, and the current time point and the next time point are both
  • the preset transmission parameter set includes at least one of the following: a period, an offset, a duration, and a number of bursts.
  • the sending policy of the UCDS includes one of the following: shortening the sending period of the UCDS; and using the sending window to increase the sending opportunity of the UCDS, wherein the design of the sending window includes one of the following: the sending window is located before the preset time point, and the sending window After the preset time point, the sending window includes a preset time point, where the preset time point is determined by the preset sending parameter set, and the preset sending parameter set includes at least one of the following: a period, an offset, a duration, and a number of bursts; The first period and the second period are used to transmit the UCDS, wherein the first period is greater than the second period, and the second period is used to supplement the sending of the UCDS in the second period if the first period fails to successfully send the UCDS.
  • the transmission window is determined by the base station and sent by the base station to the terminal; or, in the case of using the first period and the second period to cooperate with the transmission of the UCDS, the first period and The second period is determined by the base station and transmitted by the base station to the terminal.
  • the aperiodic triggering transmission uses the authorized carrier or the unlicensed carrier to notify the user equipment (UE) whether the secondary cell (SCell) corresponding to the UE sends the configuration information of the UCDS and/or the UCDS.
  • UE user equipment
  • SCell secondary cell
  • the trigger signal for triggering the SCell to transmit the UCDS is sent by using a wired or wireless manner between the cells.
  • the configuration information of whether the SCell sends the UCDS and/or sends the UCDS is notified to the UE by radio resource control (RRC) signaling, medium access control (MAC) signaling or physical layer signaling.
  • RRC radio resource control
  • MAC medium access control
  • the SCell triggers the UCDS trigger signal and/or informs the UE of the time-frequency resource location of whether the SCell sends the UCDS signaling in a pre-configured or dynamically selected manner.
  • the configuration manner includes one of the following: an independent configuration manner and a combined configuration manner.
  • each component signal adopts an independent configuration manner
  • each component signal independently configures a period, an offset, a duration, a subframe position, and a time-frequency pattern.
  • each component signal is configured with a uniform period, offset, duration, wherein each component signal has a different subframe position and/or time-frequency configuration.
  • the UCDS subframe is a periodic subframe and/or a non-periodic subframe, wherein the UCDS subframe is a subframe in which the UCDS is transmitted or a subframe in which the UE assumes that the UCDS exists.
  • the UCDS meets the LAA single RRM measurement performance.
  • the condition that the UCDS satisfies the LAA single RRM measurement performance includes one of: transmitting at least two UCDS occasions or UCDS bursts in one UCDS transmission period, wherein at least two UCDS occasions or UCDS bursts are continuously transmitted in the time domain. Or discontinuous transmission; the measurement signal/symbol is transmitted on the discontinuous symbol in the UCDS composed of the modified symbols.
  • a processing apparatus for discovering a signal is provided.
  • a processing device for discovering a signal includes: a processing module configured to perform at least one of: performing a configuration on each component signal of the discovery signal: determining a configuration manner of each constituent signal; performing pattern modification on each constituent signal; determining each component The transmission method of the signal or each component signal modified by the pattern.
  • the processing module is configured to select and retain symbols in the time-domains adjacent to or adjacent to each other in the constituent signals according to the existing time-frequency resource positions of the constituent signals of the discovery signal to form a UCDS for transmission; or, for each component signal
  • the frequency resource location is modified so that the constituent signals are adjacent or close to each other in the time domain, and the modified symbols are used to form the UCDS for transmission.
  • the processing module is arranged to modify the time domain position of each of the constituent signals.
  • the UCDS comprises at least one of: PSS; SSS; CRS; CSI-RS; PRS; wherein PSS, SSS, CRS and PRS are used for cell discovery and/or synchronization, CRS and CSI-RS are used for RRM measurement and / or CSI measurement.
  • the UCDS comprises a modified form of a single signal or a modified form of at least two signals in the PSS, SSS, CRS, PRS, CRS and CSI-RS.
  • the sending manner includes one of the following: periodic sending; aperiodic triggering sending; and periodic sending and hybrid sending in combination with aperiodic triggering.
  • the transmitting manner further includes: switching between a conventional discovery signal transmission mode of each component signal and a UCDS transmission mode of each component signal after the pattern modification.
  • the periodic transmission includes one of: transmitting the UCDS at each periodic point through the SCS; transmitting the UCDS normally at the current periodic point in the case of competing to the unlicensed carrier; and not competing for the unlicensed carrier in the case of not competing for the unlicensed carrier
  • the periodic point stops transmitting UCDS once, and after the next time it contends to the unlicensed carrier, the supplementary UCDS is sent, wherein the supplementary sending UCDS is sent in an irregular period.
  • the periodic transmission includes one of the following: the UCDS is sent according to the preset transmission parameter set by the LBT or the idle channel evaluation C-A, wherein the preset transmission parameter set includes at least one of the following: period, offset, and duration. Time, number of bursts; in the case of competing to an unlicensed carrier, transmitting UCDS at the current point in time; in the case of not competing to an unlicensed carrier, stopping sending UCDS once at the current period, and at the next point in time In the previous time period, if the content is re-competed to the unlicensed carrier, the UCDS continues to be sent, wherein the UCDS continues to be sent in an irregular periodic transmission, and the next time point is after the current time point, and the current time point and the next time point are both
  • the preset transmission parameter set includes at least one of the following: a period, an offset, a duration, and a number of bursts.
  • the sending policy of the UCDS includes one of the following: shortening the sending period of the UCDS; and using the sending window to increase the sending opportunity of the UCDS, wherein the design of the sending window includes one of the following: the sending window is located before the preset time point, and the sending window After the preset time point, the sending window includes a preset time point, where the preset time point is determined by the preset sending parameter set, and the preset sending parameter set includes at least one of the following: a period, an offset, a duration, and a number of bursts; The first period and the second period are used to transmit the UCDS, wherein the first period is greater than the second period, and the second period is used to supplement the sending of the UCDS in the second period if the first period fails to successfully send the UCDS.
  • the transmission window is determined by the base station and sent by the base station to the terminal; or, in the case of using the first period and the second period to cooperate with the transmission of the UCDS, the first period and The second period is determined by the base station and transmitted by the base station to the terminal.
  • the aperiodic triggering transmission uses the authorized carrier or the unlicensed carrier to notify the user equipment UE whether the SCell corresponding to the UE sends the UCDS and/or sends the configuration information of the UCDS.
  • the trigger signal for triggering the SCell to transmit the UCDS is sent by using a wired or wireless manner between the cells.
  • the configuration information of whether the SCell sends the UCDS and/or sends the UCDS is notified to the UE by using RRC signaling, MAC signaling, or physical layer signaling.
  • the SCell triggers the UCDS trigger signal and/or informs the UE of the time-frequency resource location of whether the SCell sends the UCDS signaling in a pre-configured or dynamically selected manner.
  • the configuration manner includes one of the following: an independent configuration manner and a combined configuration manner.
  • each component signal adopts an independent configuration manner
  • each component signal is independently configured with a period, Offset, duration, sub-frame position, time-frequency pattern.
  • each component signal is configured with a uniform period, offset, duration, time-frequency pattern, wherein each component signal has a different subframe position and/or time-frequency configuration.
  • the UCDS subframe is a periodic subframe and/or a non-periodic subframe, wherein the UCDS subframe is a subframe in which the UCDS is transmitted or a subframe in which the UE assumes that the UCDS exists.
  • the UCDS meets the LAA single RRM measurement performance.
  • the condition that the UCDS satisfies the LAA single RRM measurement performance includes one of: transmitting at least two UCDS occasions or UCDS bursts in one UCDS transmission period, wherein at least two UCDS occasions or UCDS bursts are continuously transmitted in the time domain. Or discontinuous transmission; the measurement signal/symbol is transmitted on the discontinuous symbol in the UCDS composed of the modified symbols.
  • each component signal of the discovery signal determines a configuration mode of each component signal; performing pattern modification on each component signal; determining each component signal or each component signal modified by the pattern
  • the transmission method solves the problem that the discovery signal applied to the unlicensed carrier in the related art has many problems, and needs to redesign the discovery signal, thereby reducing the occupation time and avoiding multiple interferences to other devices.
  • FIG. 1 is a flow chart of a method of processing a discovery signal according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram showing the position of each UCDS signal in the time domain in the method 1 according to the first embodiment of the present invention
  • FIG. 3 is a schematic diagram showing the location of resource elements of a CRS in Method 1 according to a preferred embodiment of the present invention
  • FIG. 4 is a schematic diagram showing the position of each UCDS signal in the time domain in the second method according to the preferred embodiment of the present invention.
  • FIG. 5 is a schematic diagram showing the location of resource elements of a CRS in Method 2 according to a preferred embodiment of the present invention
  • FIG. 6 is a schematic diagram showing the position of each UCDS signal in the time domain in the third method according to the preferred embodiment of the present invention.
  • FIG. 7 is a schematic diagram showing the location of resource elements of a CRS in Method 3 according to a preferred embodiment of the present invention.
  • FIG. 8 is a schematic diagram of resource element locations of a CRS antenna port 1 in accordance with a preferred embodiment of the present invention.
  • FIG. 9 is a schematic diagram showing the position of each UCDS signal in the time domain in the method 1 according to the second preferred embodiment of the present invention.
  • FIG. 10 is a schematic diagram showing the location of resource elements of a CRS in Method 1 according to a preferred embodiment 2 of the present invention
  • FIG. 11 is a schematic diagram showing the position of each UCDS signal in the time domain in the second method according to the second preferred embodiment of the present invention.
  • FIG. 12 is a schematic diagram showing the location of resource elements of a CRS in method 2 according to a preferred embodiment 2 of the present invention.
  • FIG. 13 is a schematic diagram showing the position of each UCDS signal in the time domain according to a preferred embodiment 3 of the present invention.
  • FIG. 14 is a schematic diagram showing the position of another UCDS signal in the time domain according to a preferred embodiment 3 of the present invention.
  • 15 is a schematic diagram showing the position of each UCDS signal in the time domain according to a preferred embodiment 4 of the present invention.
  • 16 is a schematic diagram showing the position of each UCDS signal in the time domain according to a preferred embodiment 5 of the present invention.
  • Figure 17 is a block diagram showing the structure of a processing device for discovering signals according to an embodiment of the present invention.
  • FIG. 1 is a flow chart of a method of processing a discovery signal in accordance with an embodiment of the present invention. As shown in FIG. 1, the method may include the following processing steps:
  • Step S102 Perform at least one of the following operations on each component signal of the discovery signal: determining a configuration manner of each component signal; performing pattern modification on each component signal; and determining a transmission manner of each component signal or each constituent signal modified by the pattern.
  • the discovery signal in the related art has many problems in applying to an unlicensed carrier, and it is necessary to redesign the discovery signal.
  • the method shown in FIG. 1 is used to process at least one of a configuration mode, a design mode, and a transmission mode of each component signal of the discovery signal, thereby solving various problems in the related art that the discovery signal is applied to an unlicensed carrier.
  • the problem of redesigning the discovery signal is required, thereby reducing the occupation time and avoiding multiple interferences to other devices.
  • pattern modification of each component signal may include one of the following operations:
  • Operation 1 According to the existing time-frequency resource location of each component signal of the discovery signal, select and retain the symbols in the time domain that are adjacent or close to each other in the constituent signals to form a discovery signal in the unlicensed carrier (Unlicensed Carrier– Discovery Signal (referred to as UCDS) for sending;
  • UCDS Unlicensed Carrier– Discovery Signal
  • Operation 2 Modify the time-frequency resource position of each component signal so that the positions of the component signals in the time domain are adjacent or similar, and use the modified symbols to form a UCDS for transmission.
  • the above discovery signals exist in the following two design ways:
  • Manner 1 According to the existing time-frequency resource position of each component signal of the discovery signal, symbols of adjacent or similar time domains in each component signal are selected and retained to form a UCDS for transmission.
  • the existing discovery signal duration is 1 subframe (FDD mode).
  • the CRS occupies symbol 0, symbol 4, symbol 7, symbol 11, SSS occupies symbol 5, PSS occupies symbol 6, CSI-RS It can be configured. If CSI-RS is not configured, the DS spans at least 12 symbols, which actually occupy at least 6 symbols.
  • the CRS can be selected to be transmitted on symbol 4, and symbol 0, symbol 7, and symbol 11 are not transmitted.
  • the SSS still occupies the symbol 5, and the PSS occupies the symbol 6. Therefore, the UCDS here is composed of CRS, PSS/SSS, and occupies symbol 4, symbol 5, and symbol 6. DS spans 3 symbols and its actual occupancy is also 3 symbols.
  • this method does not change or move the time domain position of the constituent signals, only selects and retains them, and sends signals that are close to each other; the advantage is that it is compatible with the prior art and has less changes.
  • Manner 2 Modify the time-frequency resource location of each component signal, especially the time domain location, such that the positions of the constituent signals in the time domain are adjacent or similar.
  • the modified symbols form the UCDS for transmission.
  • the existing discovery signal duration is 1 subframe (FDD mode).
  • the CRS occupies symbol 0, symbol 4, symbol 7, symbol 11, SSS occupies symbol 5, PSS occupies symbol 6, CSI-RS It can be configured. If CSI-RS is not configured, the DS spans at least 12 symbols, and it actually occupies at least 6 symbols.
  • the CRS can be selected to be transmitted on symbol 7, and not transmitted at symbol 0, symbol 4, or symbol 11.
  • SSS and PSS are changed to be sent on symbols 8 and 9, respectively. Therefore, UCDS occupies symbol 7, symbol 8, and symbol 9.
  • the time domain patterns of the UCDS component signals such as CRS, PSS, SSS, CSI-RS, etc. can be modified in the existing format such that the positions of the constituent signals in the time domain are adjacent or similar.
  • the CRS signal or the CSI-RS signal in the UCDS may be continuously transmitted before the PSS/SSS or continuously after the PSS/SSS, and may be continuously transmitted between the PSS and the SSS when the PSS and the SSS symbols are not adjacent.
  • the modification of the frequency domain resource is mainly applied to the scenario in which the signal in the UCDS occupies the same symbol, and needs to be in the frequency domain resource. Staggered.
  • the second method has the advantage of ensuring that all symbols of the UCDS can be transmitted continuously or in close proximity, which is more flexible and can control the number of symbols occupied by each component signal.
  • the modification of the above-mentioned frequency domain resources may also involve the problem that the use of the unlicensed carrier needs to occupy 80% of the nominal bandwidth.
  • the synchronization signal PSS/SSS only occupies 6 RBs in the middle of the frequency domain. Even if the base station can compete for the unlicensed carrier usage right to transmit the synchronization signal, it is likely to be preempted by other devices or base stations. Therefore, it can be in the frequency domain. Send PSS and/or SSS repeatedly.
  • the first mode cannot ensure that all the signals occupying the symbol positions in the UCDS are adjacent or similar, and the number of symbols occupied by the signals in the first mode may be limited.
  • the LBT/CCA mechanism is required to send the UCDS. If the channel is busy, UCDS cannot be sent normally, that is, UCDS may not be sent for a long time. At this time, RRM measurement performance and synchronization performance cannot be maintained. Therefore, UCDS is better able to satisfy LAA single RRM measurement performance ( Single-shot measurement).
  • UCDS For the UCDS pattern determined by the above mode one or the above mode two, it has been possible to ensure that the symbols in the UCDS are transmitted continuously (or similarly). To ensure UCDS single measurement performance, UCDS can be transmitted repeatedly and continuously.
  • the UCDS transmission period is 80ms (or aperiodic transmission), and there is a UCDS occasion (or burst) in one cycle.
  • the UCDS occasion duration is 1ms, and the UCDS is internal.
  • the time domain of each symbol in the 1ms pattern is continuous.
  • two or more UCDS occasions can be sent in one UCDS transmission period. These occasions (or bursts) are preferably consecutive in the time domain (the possibility of non-continuous repeated transmission is not excluded) ). For example: within 80ms, there are 2ms to send UCDS, which is 2ms continuous in the time domain. These 2ms can be called 2 UCDS bursts or 2 UCDS occasions. Of course, multiple UCDS occasions that are repeatedly transmitted in the time domain can be collectively referred to as one UCDS occasion.
  • the transmission mode of the known signal may be modified by using the above method 2, and the measurement signal/symbol is transmitted on the discontinuous symbol in the discovery signal.
  • the existing authorized carrier discovery signal duration can be 1 subframe (FDD mode).
  • the CRS can occupy symbol 0, symbol 4, symbol 7, and symbol 11, and the SSS can occupy the symbol 5, and the PSS.
  • the symbol 6 can be occupied, and the CSI-RS can be configured.
  • the measurement signals CRS and/or CSI-RS may also be transmitted on idle symbols such as symbol 1, symbol 2, symbol 3, symbol 8, symbol 9, symbol 10.
  • the existing discovery signal undergoes the above modified pattern as a UCDS pattern, which ensures that the symbols in the UCDS are continuously transmitted in the time domain, and also ensures the single measurement performance of the CDS.
  • the discontinuous symbols in the UCDS subframe can be modified in the above two ways, or The measurement signal/symbol is filled to satisfy or enhance the measurement performance.
  • the discontinuous symbols in the UCDS subframe can be modified or filled with measurement signals/symbols in the above two ways to satisfy or enhance the measurement performance. It can also be sent according to the original mode of each signal in the UCDS subframe, and the discontinuous symbols are not modified or filled, and the data mapping can be used to ensure continuous transmission in the time domain without affecting data transmission.
  • the unlicensed carrier device for example, LAA or WIFI
  • the unlicensed carrier resources are easily preempted, and the interference to other sites can be ignored.
  • the discovery signal is transmitted through the LBT/CCA or the discovery signal is directly transmitted through the SCS, and the problems such as the occupation time, multiple preemption, and multiple interference of the signal are weakened.
  • the traditional discovery signal DS can be used. It is better to use the traditional discovery signal DS for discovery, synchronization and measurement.
  • the two transmission modes of the discovery signal include the Rel-12 discovery signal transmission mode and the UCDS transmission mode.
  • the authorized carrier cell such as a PCell and/or an unlicensed carrier cell (eg, an unlicensed carrier access point or other access point) needs to transmit a discovery signal, and/or a discovery signal corresponding to the discovery signal before the access point transmits the discovery signal.
  • the configuration information is sent to the access point, and/or the UE.
  • the above UCDS may include but is not limited to at least one of the following:
  • PSS Primary synchronization signal
  • SSS secondary synchronization signal
  • CRS Cell-specific reference signal
  • CSI-RS Channel state information - reference signal
  • PSS, SSS, CRS and PRS are used for cell discovery and/or synchronization
  • CRS and CSI-RS are used for RRM measurement and/or CSI measurement.
  • the UCDS component signal may include not only at least one of the above signals, but also a modified form of the foregoing signal.
  • the foregoing sending manner may include but is not limited to one of the following:
  • Mode 1 Periodically, the UCDS can transmit according to a preset fixed period, offset, duration, and number of bursts.
  • the above method 1 can be further divided into the following three ways:
  • UCDS is sent at each cycle point through SCS, regardless of whether the cycle point is already occupied;
  • the short control signaling SCS mentioned in the present invention does not only refer to the SCS in the ETSI specification, but generally does not need to perform the idle channel assessment (CCA) and the first listen (LBT), but can directly send Short-term signal, channel function.
  • the signal and channel are transmitted within the SCS duration.
  • the LAA access point does not need to perform the Clear Channel Assessment (CCA) and the Listen After (LBT) function. Therefore, in order to ensure the friendly coexistence of different systems and devices in the unlicensed frequency band, the SCS transmission time is best. Need to meet certain regulatory requirements.
  • Some regions and countries may have additional names and definitions for SCS, collectively referred to herein as SCS. In some regions and countries, SCS may not be defined. For these regions and countries, SCS and similar rules may be defined (for example, the requirements for the length of transmission, and the duration of the fixed period of observation shall not be greater than the set ratio) for the non-occupied period.
  • the signal is sent.
  • the UCDS can be normally sent at the periodic point; if there is no competition to the unlicensed carrier, the UCDS is stopped once at the periodic point, and waits for the next periodic point, if the next periodic point If you have not competed for resources, you will continue to stop.
  • the UCDS can be normally sent at the periodic point; if there is no contention to the unlicensed carrier, the UCDS is stopped once at the periodic point, and the supplementary transmission is sent after the next time the non-authorized carrier is contending However, it is not required to be sent at a periodic point, that is, delayed transmission, which is actually an irregular periodic transmission.
  • Periodic transmission needs to be determined by an authorized carrier (eg, PCell) or other unlicensed carrier, or notify the SCell and/or UEs about the SCells sending UCDS (including at least one of the following: period, offset, duration, port, Power, burst (burst), the UE may detect the UCDS according to the determined transmission pattern or measurement pattern of the UCDS (including at least one of the following: period, offset, duration, port, power, number of bursts).
  • an authorized carrier eg, PCell
  • UEs including at least one of the following: period, offset, duration, port, Power, burst (burst)
  • burst burst
  • Manner 2 Aperiodic triggered transmission, which can trigger acyclic transmission of UCDS by, for example, PCell.
  • Aperiodic transmission requires an authorized carrier such as a PCell or other unlicensed carrier to inform the UE whether the SCell transmits UCDS and/or transmits configuration information of the UCDS.
  • the trigger signal that triggers the SCell to send the UCDS can be sent by wired or wireless mode between cells.
  • UCDS may have different effects on the constituent signals, it may trigger only one signal, multiple signals, or all the signals that the UCDS may constitute a signal, or a modified form of the above signals.
  • the information informing the UE whether the SCell transmits the UCDS and/or the configuration of transmitting the UCDS may be transmitted through RRC signaling, MAC signaling, or physical layer signaling (for example, DCI).
  • the neighboring cell is notified of the information about the UCDS sent by the SCell, and the measurement impact on the neighboring cell and the local cell is reduced.
  • the time-frequency resource location that triggers the SCell to transmit the UCDS trigger signal and/or informs the UE whether the SCell sends the UCDS signaling may be pre-configured or dynamically selected.
  • the pre-configured information may have a set period, subframe, symbol, resource element, etc., and the SCell and/or the UE only need to detect the trigger signal and/or signaling at these pre-configured points. Dynamic selection requires SCell and/or UE for blind detection.
  • Mode 3 Mixed mode transmission, that is, combination of periodic transmission and trigger transmission.
  • the sparse UCDS can be periodically sent through the SCS.
  • the PCell triggers the SCell to send the UCDS on the unlicensed carrier.
  • the hybrid mode transmits information that also needs to determine or notify the above two transmission modes, for example, information including a transmission pattern of the UCDS, a measurement pattern, and whether the UCDS is sent or not, and the SCell.
  • the SCell may send all the constituent signals of the UCDS, or may only transmit one or several constituent signals in the UCDS, because the requirements of the UCDS constituent signals are inconsistent, such as: synchronization requirements and RRM measurement.
  • Demand-dependent UCDS signals are not the same.
  • the SCell sends a pattern of UCDS (including at least one of the following: period, duration, offset) and can be adjusted as necessary.
  • each component signal of the UCDS can be independently configured, and of course, it can also be configured in combination.
  • the UCDS component signals can independently configure the period, offset, duration, subframe position, and time-frequency pattern. There may also be a constraint relationship between the constituent signals.
  • the UCDS may include PSS, SSS, CRS, CSI-RS, and each signal may be independently configured.
  • the CRS period is a multiple of the PSS and/or SSS period; or, the PSS and/or SSS period is a multiple of the CRS period; or, the CSI-RS period is a multiple of the CRS period; or, the CRS period is a multiple of the CSI-RS period; or, CSI-
  • the RS period is a multiple of the PSS and/or SSS period; alternatively, the PSS and/or SSS period is a multiple of the CSI-RS period.
  • the subframe position of each signal may be defined by a relationship, for example, the constraint CRS is located in a subframe in which the PSS and/or SSS are transmitted; or the CRS is located in a subframe in which the CSI-RS is transmitted; or, the CSI-RS is located.
  • UCDS can configure a uniform period, offset, duration, number of bursts, and so on.
  • the UCDS component signals may have different subframe positions and/or time-frequency configurations, such as subframes, symbols, and resource elements.
  • the period of UCDS (for example: including PSS, SSS and CRS, CSI-RS, other signals can be matched or not) can be configured as 40ms, 80ms, 160ms; duration can be configured from 1 subframe to 5 subframes; Within each duration of the period, each component signal of the UCDS may have different configuration or subframe information, for example, the PSS and/or the SSS may be sent only once, the CRS may be sent multiple times, and the CSI-RS and the PSS and/or the SSS have a subframe. Or a symbol offset relationship, and sub-frame or symbol information of each constituent signal.
  • a UCDS subframe may be defined as a subframe in which a UCDS is transmitted or a subframe in which a UE assumes that a UCDS exists.
  • the UCDS subframe may be one, two or more subframes.
  • the UCDS subframe may be periodic, non-periodic, or both.
  • each constituent signal of the UCDS in each embodiment is also applicable to the case where each constituent signal is transmitted as a UCDS alone, or a case where two, three, or a plurality of signal combinations are transmitted as UCDS.
  • the UCDS may include the PSS, the SSS, and the CRS.
  • the CRS time-frequency domain pattern designed in the first embodiment is also applicable to the scenario where the UCDS only includes the CRS.
  • the UCDS may include PSS, SSS, and CRS, and there is one symbol before the SSS and PSS symbols to transmit the CRS.
  • CRS with 2 symbols or multiple adjacent/similar symbols before the SSS and PSS symbols; or, there is 1 symbol after the SSS and PSS symbols to transmit CRS (ie, method 2 in the first embodiment) Or, there are 2 or more adjacent/similar symbols to transmit the CRS after the SSS and PSS symbols; or, there are equal or unequal numbers of symbols before and after the SSS and PSS symbols to transmit the CRS (ie, the method in the preferred embodiment 1) three).
  • the UCDS can include PSS, SSS, and CRS.
  • the PSS and SSS are sent on adjacent symbols, while the CSI-RS is not configured to transmit.
  • the preferred embodiment can include the following methods:
  • the SSS and the PSS are transmitted in the first subframe of the UCDS subframe or a certain subframe symbol 5 and symbol 6 after the offset.
  • the CRS is transmitted in the UCDS subframe symbol 4. That is, the symbols for transmitting UCDS are symbol 4, symbol 5, and symbol 6.
  • the CRS may be sent or transmitted multiple times in all downlink subframes or UCDS subframes.
  • SSS and PSS can be sent only once in a duration of UCDS.
  • the UCDS duration is 2 subframes in the UCDS period, or the UCDS is 2 subframes in one trigger transmission.
  • the symbols for transmitting the UCDS are: symbol 4, symbol 5, symbol 6 and symbols in the second subframe in the first subframe. 4;
  • the PSS/SSS is offset by one subframe, that is, symbol 4 in the first subframe and symbol 4, symbol 5, and symbol 6 in the second subframe.
  • FIG. 2 is a schematic diagram showing the position of each signal of the UCDS in the time domain in the method 1 according to the first embodiment of the present invention. As shown in Figure 2, it shows the transmission of UCDS in the time domain.
  • FIG. 3 is a schematic diagram showing the location of resource elements of a CRS in Method 1 according to a preferred embodiment of the present invention. As shown in FIG. 3, it indicates the time-frequency domain position of the CRS in the subframe. There may be an offset in the frequency domain location.
  • the resource element RE(k, l) of the CRS transmitted in FIG. 3 is (3, 4), (9, 4), where k is the frequency domain number of the resource element, and l is the resource.
  • the time domain number of the element if sorted according to the symbol of the subframe, the value of l is 0 to 13; of course, there may be 3 RE offsets in the frequency domain, namely (0, 4), (6, 4); In addition, there may be one, two, etc. RE offsets in the frequency domain.
  • the SSS and the PSS may be transmitted in the first subframe of the UCDS subframe or a certain subframe symbol 5 and symbol 6 after the offset.
  • the CRS is transmitted in the UCDS subframe symbol 7 (or symbol 0 of the second slot, the same below). That is, the symbols for transmitting UCDS are symbol 5, symbol 6, and symbol 7.
  • the CRS may be sent or transmitted multiple times in all downlink subframes or UCDS subframes.
  • SSS and PSS can be sent only once in a duration of UCDS.
  • the UCDS duration in the UCDS period is 2 subframes or the UCDS is 2 subframes in one trigger transmission.
  • the symbols for transmitting the UCDS are: symbol 5, symbol 6, symbol 7 and symbol 7 in the second subframe in the first subframe.
  • PSS/SSS is offset by one subframe, that is, symbol 7 in the first subframe and symbol 5, symbol 6, and symbol 7 in the second subframe.
  • FIG. 4 is a schematic diagram showing the position of each UCDS signal in the time domain in the second method according to the preferred embodiment 1 of the present invention. As shown in Figure 4, it shows the transmission of UCDS in the time domain.
  • FIG. 5 is a schematic diagram showing the location of resource elements of a CRS in Method 2 according to a preferred embodiment of the present invention. As shown in FIG. 5, it indicates the time-frequency domain position of the CRS in the subframe. There may be an offset in the frequency domain location.
  • the resource element RE(k, l) of the CRS transmitted in FIG. 5 is (0, 7), (6, 7); of course, there may be three RE offsets in the frequency domain, that is, (3, 7), ( 9,7); In addition, there may be one, two equal RE offsets in the frequency domain.
  • the SSS and the PSS may be transmitted in the first subframe of the UCDS subframe or a certain subframe symbol 5 and symbol 6 after the offset.
  • the CRS is transmitted in UCDS subframe symbols 4 and 7. That is, the symbols for transmitting the UCDS are symbol 4, symbol 5, symbol 6, and symbol 7.
  • the CRS may be sent or transmitted multiple times in all downlink subframes or UCDS subframes.
  • SSS, PSS can be UCDS is only sent once in a duration.
  • the UCDS duration is 2 subframes in the UCDS period, or the UCDS is 2 subframes in one trigger transmission.
  • the symbols for transmitting the UCDS are: symbol 4, symbol 5, symbol 6, symbol 7, and second sub-frame in the first subframe.
  • symbol 4, symbol 7; or, PSS/SSS is offset by one subframe, that is, symbol 4, symbol 7 in the first subframe and symbol 4, symbol 5, symbol 6, symbol 7 in the second subframe.
  • FIG. 7 is a schematic diagram showing the location of resource elements of a CRS in Method 3 according to a preferred embodiment of the present invention. As shown in FIG. 7, it indicates the time-frequency domain position of the CRS in the subframe. There may be an offset in the frequency domain location.
  • the resource element RE(k, l) of the CRS transmitted in FIG. 7 is (3, 4), (9, 4), (0, 7), (6, 7); There may be 3 RE offsets in the frequency domain, namely (0, 4), (6, 4), (3, 7), (9, 7); in addition, there may be one, 2 in the frequency domain. Equal RE offsets.
  • the CRS in the above three methods may be single port transmission, or may be two-port or multi-port transmission.
  • the RE format of single port transmission is shown in Figure 3, Figure 5 and Figure 7. 8 is a schematic diagram of resource element locations of CRS antenna port 1 in accordance with a preferred embodiment of the present invention. As shown in FIG. 8, it shows the RE format of port 1, in which the port 0 of the dual port is the same as the RE format of the single port.
  • port 1 also has the same number of RE offsets on the basis of FIG.
  • the UCDS can include PSS, SSS, and CRS.
  • PSS and SSS are sent in non-adjacent symbols.
  • CSI-RS is not configured to send.
  • the preferred embodiment can include the following methods:
  • the SSS is transmitted in the symbol 13 of the first subframe, and the PSS is transmitted in the symbol 2 of the second subframe.
  • the CRS is transmitted in symbol 0 of the second subframe. That is, the symbol for transmitting the UCDS is the symbol 13 of the first subframe, the symbol 0 of the second subframe, and the symbol 2.
  • FIG. 9 is a schematic diagram showing the position of each UCDS signal in the time domain in the first method according to the second preferred embodiment of the present invention. As shown in Figure 9, it shows the transmission of UCDS in the time domain.
  • FIG. 10 is a schematic diagram showing the location of resource elements of a CRS in Method 1 according to a preferred embodiment 2 of the present invention. As shown in FIG. 10, it indicates the time-frequency domain position of the CRS in the subframe. There may be an offset in the frequency domain location.
  • the resource element RE(k, l) of the CRS transmitted in FIG. 10 is (0, 0), (6, 0); of course, there may be three RE offsets in the frequency domain, that is, (3, 0), ( 9,0); In addition, there may be one, two equal RE offsets in the frequency domain.
  • the SSS can be transmitted in the symbol 13 of the first subframe, and the PSS is transmitted in the symbol 2 of the second subframe.
  • the CRS is transmitted in symbol 0 and symbol 1 of the second subframe. That is, the symbol for transmitting the UCDS is the symbol 13 of the first subframe, the symbol 0 of the second subframe, the symbol 1, and the symbol 2.
  • FIG. 11 is a schematic diagram showing the position of each UCDS signal in the time domain in the second method according to the second preferred embodiment of the present invention. As shown in Figure 11, it shows the transmission of UCDS in the time domain.
  • FIG. 12 is a schematic diagram showing the location of resource elements of a CRS in Method 2 according to a preferred embodiment 2 of the present invention. As shown in FIG. 12, it indicates the time-frequency domain position of the CRS in the subframe. There may be an offset in the frequency domain location.
  • the resource elements RE(k, l) of the CRS transmitted in FIG. 12 are (0, 0), (6, 0), (3, 1), (9, 1); of course, there may be 3 in the frequency domain.
  • RE offset that is, (3, 0), (9, 0), (0, 1), (6, 1); in addition, there may be one, two equal RE offsets in the frequency domain.
  • the CRS in the above two methods may be single port transmission, or may be two port or multi port transmission.
  • the RE format for single port transmission is shown in Figure 10 and Figure 12.
  • port 0 has the same RE format as the single port, and the RE format of port 1 can be offset by 3 REs in the frequency domain on a single port basis.
  • port 1 also has the same number of RE offsets.
  • the UCDS may include PSS, SSS, CRS, CSI-RS.
  • PSS and SSS are sent in adjacent symbols.
  • the transmission mode and the time domain/frequency domain pattern of the PSS, the SSS, and the CRS may be consistent with the various methods or the like described in the first preferred embodiment.
  • the CSI-RS can be transmitted in accordance with the method specified in 3GPP standard 36.211. That is, the UCDS may include: PSS, SSS, CRS, CSI-RS.
  • the base station does not transmit the CSI-RS in the time domain location where the PSS, SSS, and CRS are transmitted, or the UE assumes that there is no CSI-RS signal in the time domain location of the PSS, SSS, and CRS in the UCDS.
  • the SSS and the PSS are transmitted in the subframe symbol 5 and the symbol 6. If the CSI-RS is configured to be transmitted in the same subframe as the symbol 5 or the symbol 6, a collision occurs, so the base station may not transmit the CSI-RS in the subframe;
  • the frequency domain position of the CSI-RS may be changed to avoid the frequency domain position of the PSS, the SSS, and the CRS.
  • the SSS and the PSS are transmitted in the subframe symbol 5 and the symbol 6.
  • the CSI-RS is configured to be transmitted in the same subframe as the symbol 5 or the symbol 6, a collision occurs.
  • the CRS-RS may not be transmitted in the 6 RBs occupied by the SSS and the PSS, and the other frequency domains of the symbols 5 and 6.
  • the resource sends a CSI-RS.
  • the offset value between the CSI-RS and the SSS is set to n subframes, and the offset value needs to be notified to the UE.
  • the CSI-RS configuration in the existing 3GPP 36.211 Table 6.10.5.2-1 is restricted, and the configuration format in the existing configuration that makes the symbol position of the CSI-RS adjacent or close to the symbols occupied by other constituent signals in the UCDS is reserved. .
  • FIG. 13 is a schematic diagram showing the position of each UCDS signal in the time domain according to a preferred embodiment 3 of the present invention. As shown in FIG. 13, symbol 8 may transmit CRS or not transmit UCDS signals.
  • the existing CSI-RS time domain configuration is modified such that the symbol location of the CSI-RS is adjacent or close to the symbol occupied by other constituent signals in the UCDS.
  • the CSI-RS configuration can be modified to be transmitted on symbol 0, symbol 1 (symbol 7, symbol 8 of the subframe) of slot 1.
  • FIG. 14 is a schematic diagram showing the position of each UCDS signal in the time domain according to a preferred embodiment 3 of the present invention. As shown in FIG. 14, the UCDS occupies the symbol 4, the symbol 5, the symbol 6, the symbol 7, and the symbol 8. Of course, on the basis of FIG. 12, the CSI-RS changes the configuration, and is transmitted on the symbol 8 and the symbol 9, that is, the UCDS. Occupied symbol 5, symbol 6, symbol 7, symbol 8, symbol 9.
  • the UCDS may include PSS, SSS, CRS, CSI-RS.
  • PSS and SSS are sent in non-adjacent symbols.
  • the transmission mode and the time domain/frequency domain pattern of the PSS, the SSS, and the CRS may be consistent with the various methods or the like described in the above preferred embodiment 2.
  • the CSI-RS can be transmitted in accordance with the method specified in 3GPP standard 36.211. That is, the UCDS may include: PSS, SSS, CRS, CSI-RS.
  • the base station does not transmit the CSI-RS in the time domain location where the PSS, SSS, and CRS are transmitted, or the UE assumes that there is no CSI-RS signal in the time domain location of the PSS, SSS, and CRS in the UCDS.
  • the SSS and the PSS are transmitted in the symbol 13 (the first subframe) and the symbol 2 (the latter subframe). If the CSI-RS is configured to transmit on one of the corresponding symbols of the two subframes or one of the symbols, a collision may occur, so the base station may not transmit the CSI-RS in such subframes.
  • the frequency domain position of the PSI, the SSS, and the CRS are avoided by changing the frequency domain position of the CSI-RS.
  • the SSS and the PSS are transmitted in the symbol 13 (the first subframe) and the symbol 2 (the latter subframe). If the CSI-RS is configured to be sent on the corresponding symbols of the two subframes, a collision occurs. In this case, the CSI-RSs are not transmitted in the 6 RBs occupied by the SSS and the PSS, and the CSI-RS is transmitted in other frequency domain resources.
  • the offset value between the CSI-RS and the SSS is set to n subframes, and the offset value needs to be notified to the UE.
  • the CSI-RS configuration in the existing 3GPP 36.211 Table 6.10.5.2-1 is restricted, and the configuration format in the existing configuration that makes the symbol position of the CSI-RS adjacent or close to the symbols occupied by other constituent signals in the UCDS is reserved. .
  • the existing CSI-RS time domain configuration is modified such that the symbol location of the CSI-RS is adjacent or close to the symbol occupied by other constituent signals in the UCDS.
  • FIG. 15 is a diagram showing the position of each signal of the UCDS in the time domain according to a preferred embodiment 4 of the present invention. As shown in FIG. 15, the UCDS occupies the symbols 13, 0, 1, 2, and 3, wherein the symbol 13 is a symbol for transmitting the SSS in the previous subframe, and the other symbols are located in the next subframe. Other similar methods can exist as well, and are not enumerated here.
  • FIG. 16 is a schematic diagram showing the position of each UCDS signal in the time domain according to a preferred embodiment 5 of the present invention.
  • the UCDS may include PSS, SSS, CRS, and PRS.
  • PSS and SSS are sent in non-adjacent symbols.
  • the time domain resources occupied by CRS and PRS can remain unchanged. That is, the CRS occupies the symbols 0, 4, 7, and 11 in the subframe.
  • the PRS occupies symbols 3, 5, 6, 8, 9, 10, 12, 13 in the subframe.
  • SSS occupies symbol 1.
  • PSS occupies symbol 2.
  • the manner in which the UCDS is periodically transmitted through the LBT/CCA is mainly directed to the above.
  • the UCDS can be sent according to a periodic opportunity, that is, the UCDS can be transmitted according to a preset fixed period, offset, duration, and number of bursts.
  • the preset transmission parameters may include one or more of the plurality of parameters described above. However, it is necessary to satisfy the LBT/CCA success condition before it can be sent.
  • the UCDS can be normally sent at a preset transmission time point (the preset time point refers to a period of time determined by a parameter such as the period, offset, etc.); if there is no competition To the unlicensed carrier, the UCDS is stopped at this point in time. However, before the next time point and for a period of time after the current time point, if the unlicensed carrier is contending, the transmission may continue, but the UCDS is not required to be sent at a preset time point, in other words, it may be delayed. This method of transmission is actually an irregular periodic transmission.
  • the period of time is not necessarily limited to a preset time point, and may be set before a preset time point or include a preset time point.
  • the preset time points may be continuous in the time domain, and of course may be discontinuous in the time domain.
  • Method 1 Shorten the transmission cycle of UCDS.
  • the period of the existing discovery signal of the authorized carrier may be 40 ms, 80 ms, or 160 ms, and the transmission period of the UCDS may be set to be 10 ms, 20 ms, or 40 ms.
  • the UCDS transmission period is 10ms, then the probability of successfully sending UCDS once in a period of time (for example, within 160ms) will increase greatly.
  • the UCDS transmission window can be designed to increase the UCDS transmission opportunity.
  • the UCDS send window can be located after or before the preset time point of the UCDS, and the UCDS send window can also include the preset time point.
  • the UCDS transmission window and the preset time point may be continuous in the time domain or discontinuous in the time domain.
  • the UCDS transmission window is a time period in which a UCDS can be sent after a preset time point starting position, that is, the UCDS transmission window duration includes a preset time point.
  • the UCDS transmit window can be periodic, ie there is one UCDS transmit window in each UCDS cycle. If the UCDS does not compete for resources at a preset time point, it may continue to attempt to transmit within the UCDS transmission window after this time point before the next preset time point. If the transmission is successful, the next transmission opportunity needs to wait until Preset at the next point in time. If there is no contention in the UCDS transmission window, that is, the UCDS fails to be sent in the UCDS transmission window, the next transmission opportunity needs to wait until the next time point is preset.
  • Manner 3 In order to increase the success rate of UCDS transmission, and the UE detection cannot be too complicated, a dual-cycle setting may be considered. In addition to the preset long period, a short period is set to attempt to supplement the transmission of the UCDS. If the transmission fails at the periodic point of the preset long period, the UCDS may continue to be attempted to be transmitted at the periodic point of the subsequent short period. If the transmission succeeds at the preset long-period periodic point, the next transmission opportunity needs to wait until the next preset long-period periodic point, that is, the periodic transmission point at which the subsequent short period does not need to be performed.
  • the preset transmission parameter may include one or more of the above multiple parameters, and then the UCDS may transmit the time point as subframe 0, subframe 80, subframe 160, and the like.
  • the ability to send UCDS at these periodic points depends on the results of the LBT/CCA. For example, if the UCDS contends to the unlicensed carrier usage rights of subframe 0, the UCDS is sent successfully. However, if the subframe 80 does not compete for the unlicensed carrier, the base station cannot successfully transmit the UCDS in the subframe 80, and can only continue to wait for the next opportunity to contend for the subframe 160 resource to transmit the UCDS.
  • a shorter UCDS transmission period can be designed, for example, the UCDS transmission period is 40 ms.
  • the UCDS transmission window can be designed to be 20 ms, that is, the UCDS transmission time point is between (0ms-20ms), (80ms-100ms), (160ms-180ms), and the like.
  • UCDS can attempt to send within a preset point in time and time window. If the UCDS contends to the resource usage right of the subframe 0, the UCDS is successfully transmitted, and the next transmission opportunity of the UCDS is the subframe 80. If the UCDS does not compete to the subframe 80 to transmit the UCDS, then the LBT/CCA is continued to be executed within (80ms-100ms), attempting to transmit the UCDS.
  • the short period of the supplementary transmission UCDS can be designed to be 10 ms. If the UCDS contends to the resource usage right of the subframe 0, the UCDS is successfully transmitted, and the next transmission opportunity of the UCDS is the subframe 80. If the UCDS does not compete with the subframe 80 to transmit the UCDS, the UCDS may be transmitted by competing for the subframes 90, 100, and the like. For example, if the right to use the subframe 90 is contending and the UCDS is successfully sent, the next UCDS transmission opportunity is Subframe 160.
  • UCDS transmissions can send UCDS in frame alignment, subframe alignment, or symbol alignment.
  • UCDS is sent in frame alignment. For example, if the UCDS is sent in the transmission window of the foregoing mode 2, if the base station does not compete for resources at the time of the subframe 80, the base station does not need to wait until the next preset time point subframe 160, and can continue to compete (80ms-100ms) UCDS transmission window. The right to use the inner sub-frame 90. If it is contented, the UCDS can be sent in subframe 90.
  • the advantage of frame alignment is that there is no need to change the existing transmission time of each component symbol in UCDS. Domain location, for example: Existing PSS/SSS generally requires FDD to be sent on subframe 0 and subframe 5. Frame alignment may not change the subframe position they transmit; however, it has the disadvantage that the UCDS transmission may have fewer chances to be tried and the transmission probability is high.
  • the UCDS is sent in sub-frame alignment. For example, if the UCDS is sent in the transmission window of the foregoing mode 2, if the base station does not compete for resources at the time of the subframe 80, the base station may continue to compete for the subframes 81, 82, ..., 99 to attempt to transmit the UCDS.
  • This type of transmission involves the location of the subframes that make up the signal transmission, but the position of the symbols within the subframe can be changed.
  • the UCDS transmission opportunity in this way is higher than the above-mentioned UCDS mode according to frame alignment.
  • the base station can perform the CCA at any time. If there is no contention to the resource at the initial time of the subframe 80, the CCA may continue to be executed at the next moment to contend for the resource, and if the resource is contending, the UCDS is transmitted according to the symbol alignment. This method is the most flexible, and the UCDS transmission opportunity is higher than the first two transmission modes, but the existing symbol time domain position of each component signal in the UCDS needs to be changed.
  • the reserved signal may be a modified form of a symbol or symbol of a signal/channel such as CRS, CSI-RS, PSS/SSS, PRS, PDSCH, PDCCH, SRS, PUCCH, UCDS, for example: SIB or DCI/UCI information, etc. It carries information such as PLMN ID, carrier information (carrier number, carrier frequency, carrier usage status), LBT parameters (for example, whether to perform LBT, frame structure, etc.), the length of the reserved signal, and the like.
  • the UCDS transmission has a preset time point (can be determined by one or more of a preset period, offset, duration, number of bursts, UCDS transmission window, supplementary transmission short period, etc.), but due to non- The particularity of the authorized carrier causes the LBT/CCA to be in a position of uncertainty.
  • the location of the successful LBT/CCA and the length of time that can be occupied are related to the UCDS transmission location, duration, etc., and can be sent as follows:
  • Manner 1 After the LBT/CCA succeeds, if the starting point (ie, the LBT/CCA successful position) that the base station can transmit is later than the preset time point of the UCDS, only part of the UCDS symbol can be sent (that is, the UCDS is truncated according to the timing relationship. ); instead of sending the UCDS immediately, the complete UCDS may be sent according to the above symbol alignment (or subframe alignment, or frame alignment), and the blank signal may be sent between the LBT/CCA success location and the UCDS transmission location. Or UCDS part of the symbol.
  • Mode 3 When the LBT/CCA is successful, if the base station can transmit longer than a single UCDS burst Long, after sending a UCDS burst, the UCDS, or part of the UCDS symbol, or measurement signal, or control information can be repeatedly transmitted to satisfy the performance of the UCDS single measurement.
  • Figure 17 is a block diagram showing the structure of a processing device for discovering signals according to an embodiment of the present invention.
  • the processing device for the discovery signal may include: a processing module 10 configured to perform at least one of: performing a configuration on each component signal of the discovery signal: determining a configuration manner of each component signal; and performing pattern modification on each component signal; Determine the transmission method of each component signal or each component signal modified by the pattern.
  • the processing module 10 is configured to select and retain a symbol UCDS of each component signal that is adjacent or close to each other in the time domain according to the existing time-frequency resource location of each component signal of the discovery signal; or, for each component signal
  • the time-frequency resource location is modified so that the constituent signals are adjacent or close to each other in the time domain, and the modified symbols are used to form the UCDS for transmission.
  • the device shown in FIG. 17 solves the problem that the discovery signal applied to the unlicensed carrier in the related art has many problems, and needs to redesign the discovery signal, thereby reducing the occupation time and avoiding multiple interferences to other devices. .
  • the above UCDS may include but is not limited to at least one of the following:
  • PSS Primary synchronization signal
  • SSS secondary synchronization signal
  • CRS Cell-specific reference signal
  • CSI-RS Channel state information - reference signal
  • PSS, SSS, CRS and PRS are used for cell discovery and/or synchronization
  • CRS and CSI-RS are used for RRM measurement and/or CSI measurement.
  • the UCDS component signal may include not only at least one of the above signals, but also a modified form of the foregoing signal.
  • the foregoing sending manner may include but is not limited to one of the following:
  • Mode 1 Periodically, the UCDS can transmit according to a preset fixed period, offset, and duration.
  • the above method 1 can be further divided into the following three ways:
  • UCDS is sent at each cycle point through SCS, regardless of whether the cycle point is already occupied;
  • the UCDS can be normally sent at the periodic point; if there is no competition to the unlicensed carrier, the UCDS is stopped once at the periodic point, and waits for the next periodic point, if the next periodic point If you have not competed for resources, you will continue to stop.
  • the UCDS can be normally sent at the periodic point; if there is no contention to the unlicensed carrier, the UCDS is stopped once at the periodic point, and the supplementary transmission is sent after the next time the non-authorized carrier is contending However, it is not required to be sent at a periodic point, that is, delayed transmission, which is actually an irregular periodic transmission.
  • Periodic transmission needs to be determined by an authorized carrier (eg, PCell) or other unlicensed carrier, or notify the SCell and/or UEs about the SCells sending UCDS (including at least one of the following: period, offset, duration, port, Power), the UE may detect the UCDS according to the determined transmission pattern or measurement pattern of the UCDS (including at least one of the following: period, offset, duration, port, power).
  • an authorized carrier eg, PCell
  • the UE may detect the UCDS according to the determined transmission pattern or measurement pattern of the UCDS (including at least one of the following: period, offset, duration, port, power).
  • Manner 2 Aperiodic triggered transmission, which can trigger acyclic transmission of UCDS by, for example, PCell.
  • Aperiodic transmission requires an authorized carrier such as a PCell or other unlicensed carrier to inform the UE whether the SCell transmits UCDS and/or transmits configuration information of the UCDS.
  • the trigger signal that triggers the SCell to send the UCDS can be sent by wired or wireless mode between cells.
  • UCDS may have different effects on the constituent signals, it may trigger only one signal, multiple signals, or all the signals that the UCDS may constitute a signal, or a modified form of the above signals.
  • the information informing the UE whether the SCell transmits the UCDS and/or the configuration of transmitting the UCDS may be transmitted through RRC signaling, MAC signaling, or physical layer signaling (for example, DCI).
  • the time-frequency resource location that triggers the SCell to transmit the UCDS trigger signal and/or informs the UE whether the SCell sends the UCDS signaling may be pre-configured or dynamically selected.
  • the pre-configured information may have a set period, subframe, symbol, resource element, etc., and the SCell and/or the UE only need to detect the trigger signal and/or signaling at these pre-configured points. Dynamic selection requires SCell and/or UE for blind detection.
  • Mode 3 Mixed mode transmission, that is, combination of periodic transmission and trigger transmission.
  • the sparse UCDS can be periodically sent through the SCS.
  • the PCell triggers the SCell to send the UCDS on the unlicensed carrier.
  • the hybrid mode transmits information that also needs to determine or notify the above two transmission modes, for example, information including a transmission pattern of the UCDS, a measurement pattern, and whether the UCDS is sent or not, and the SCell.
  • the SCell can transmit all the constituent signals of the UCDS, or can only transmit the UCDS.
  • the reason for one or several of the constituent signals is that different requirements have different requirements for the UCDS component signals.
  • the synchronization requirements are different from the UCDS signals that the RRM measurement requirements depend on.
  • the SCell sends a pattern of UCDS (including at least one of the following: period, duration, offset) and can be adjusted as necessary.
  • each component signal of the UCDS can be independently configured, and of course, it can also be configured in combination.
  • the UCDS component signals can independently configure the period, offset, duration, subframe position, and time-frequency pattern. There may also be a constraint relationship between the constituent signals.
  • the UCDS may include PSS, SSS, CRS, CSI-RS, and each signal may be independently configured.
  • the CRS period is a multiple of the PSS and/or SSS period; or, the PSS and/or SSS period is a multiple of the CRS period; or, the CSI-RS period is a multiple of the CRS period; or, the CRS period is a multiple of the CSI-RS period; or, CSI-
  • the RS period is a multiple of the PSS and/or SSS period; alternatively, the PSS and/or SSS period is a multiple of the CSI-RS period.
  • the subframe position of each signal may be defined by a relationship, for example, the constraint CRS is located in a subframe in which the PSS and/or SSS are transmitted; or the CRS is located in a subframe in which the CSI-RS is transmitted; or, the CSI-RS is located.
  • UCDS can be configured with a uniform period, offset, duration, time-frequency pattern, and so on.
  • the UCDS component signals may have different subframe positions and/or time-frequency configurations, such as subframes, symbols, and resource elements.
  • the period of UCDS (for example: including PSS, SSS and CRS, CSI-RS, other signals can be matched or not) can be configured as 40ms, 80ms, 160ms; duration can be configured from 1 subframe to 5 subframes; Within each duration of the period, each component signal of the UCDS may have different configuration or subframe information, for example, the PSS and/or the SSS may be sent only once, the CRS may be sent multiple times, and the CSI-RS and the PSS and/or the SSS have a subframe. Or a symbol offset relationship, and sub-frame or symbol information of each constituent signal.
  • a UCDS subframe may be defined as a subframe in which a UCDS is transmitted or a subframe in which a UE assumes that a UCDS exists.
  • the UCDS subframe may be one, two or more subframes.
  • the UCDS subframe may be periodic, or may be a subframe that triggers transmission of the UCDS, or both.
  • the discovery signal in the related art has many problems in applying to the unlicensed carrier, and the problem of redesigning the discovery signal is required, thereby reducing the occupation time and avoiding multiple interferences to other devices.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, thereby Storing them in a storage device is performed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that herein, or separately fabricated into individual integrated circuit modules, or Multiple of these modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.
  • the method and apparatus for processing a discovery signal provided by the embodiment of the present invention have the following beneficial effects: avoiding redesigning the discovery signal, reducing the occupation time, and avoiding causing multiple interferences to other devices.

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

Abstract

L'invention concerne un procédé et un dispositif de traitement pour un signal de découverte. Dans le procédé, au moins une des opérations suivantes est effectuée sur chaque signal constitutif d'un signal de découverte: déterminer une méthode de configuration de chaque signal constitutif; effectuer une modification de motif sur chaque signal constitutif; et déterminer une méthode de transmission de chaque signal constitutif ou de chaque constituant ayant été soumis à la modification de motif. Selon la solution technique décrite dans la présente invention, une durée d'occupation est raccourcie et un brouillage multiple vis-à-vis d'autres dispositifs est évité.
PCT/CN2015/089193 2015-01-27 2015-09-08 Procédé et dispositif de traitement pour signal de découverte WO2016119466A1 (fr)

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CN111010743A (zh) * 2019-12-16 2020-04-14 北京理工大学 非授权频谱占空比共存方式中WiFi系统性能保证方法
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CN113949493B (zh) * 2020-07-17 2023-07-25 大唐移动通信设备有限公司 一种信息传输方法、设备、装置及介质

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