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WO2016129809A1 - Procédé d'occupation de canal dans un système de communication sans fil à partage de spectre - Google Patents

Procédé d'occupation de canal dans un système de communication sans fil à partage de spectre Download PDF

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Publication number
WO2016129809A1
WO2016129809A1 PCT/KR2016/000225 KR2016000225W WO2016129809A1 WO 2016129809 A1 WO2016129809 A1 WO 2016129809A1 KR 2016000225 W KR2016000225 W KR 2016000225W WO 2016129809 A1 WO2016129809 A1 WO 2016129809A1
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WIPO (PCT)
Prior art keywords
unlicensed band
channel
subframe
base station
prach
Prior art date
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PCT/KR2016/000225
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English (en)
Korean (ko)
Inventor
엄중선
유성진
정회윤
박승근
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Electronics and Telecommunications Research Institute ETRI
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Electronics and Telecommunications Research Institute ETRI
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Priority claimed from KR1020160000274A external-priority patent/KR20160098031A/ko
Application filed by Electronics and Telecommunications Research Institute ETRI filed Critical Electronics and Telecommunications Research Institute ETRI
Publication of WO2016129809A1 publication Critical patent/WO2016129809A1/fr
Anticipated expiration legal-status Critical
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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 a channel occupancy method of a wireless communication system, and in particular, a licensed band wireless communication system according to a protocol such as Long Term Evolution (LTE) is an unlicensed band system and an unlicensed license according to a protocol such as a wireless local area network (WLAN).
  • LTE Long Term Evolution
  • WLAN wireless local area network
  • the present invention relates to a channel occupancy method of a frequency coexisting wireless communication system when a band is to be used jointly.
  • the 3rd Generation Partnership Project (3GPP) is developing a standard technology for utilizing the LTE system operating in the existing licensed band in the unlicensed band of 5GHz. Scenarios for aggregating and operating carriers in licensed and unlicensed bands are considered first.Duplex in licensed and unlicensed bands also consider modes considering both downlink or uplink and downlink of FDD (Frequency Division Duplexing). Doing.
  • the LTE system to be operated in the unlicensed band considers a resource access method considering List-Before-Talk (LBT) in order to occupy fairness resources between the existing wireless fidelity (WiFi) system and other LTE cells. By defining the duty cycle (duty cycle), etc., it is expected to limit the continuous occupancy of resources by a specific cell.
  • LBT List-Before-Talk
  • a base station eNodeB
  • eNodeB may transmit a defined signal, but in case of uplink, a plurality of terminals should transmit a signal.
  • a guard period is provided so that uplink (UL, uplink) signals arrive at a base station at the same time. It is defined to transmit a signal accordingly. If the WiFi system intends to occupy a channel during this GP period, it may be difficult for the LTE system to transmit data.
  • an object of the present invention is to, in the channel occupancy of a frequency shared wireless communication system, 1) resources of the unlicensed band without collision or interference with unlicensed band systems such as WiFi
  • the present invention provides a structure of a unlicensed band frame using a special subframe and a preamble configuration and transmission method of a PRACH (Physical Random Access Channel) channel in order to occupy the network. 2) An uplink is allocated so that the unlicensed band system does not occupy the channel first.
  • a signal transmission method for occupying a channel in a GP (Guard Period) section is provided.
  • a UE is classified into Cross Carrier Scheduling using a licensed band and Self Scheduling using a downlink of an unlicensed band.
  • the channel occupancy method for using the unlicensed band as a secondary in the wireless communication system using the licensed band for achieving the above object to use
  • DwPTS downlink pilot time slot
  • GP guard period
  • UpPTS uplink pilot time slot
  • the base station does not transmit a signal in the DwPTS section (No-Tx), or transmits control signals, data transmission, carrier sensing, Transmitting a signal to a user terminal using the interval for any one or more of back-offs;
  • a physical random access channel (PRACH) preamble for UL synchronization in a consecutive period of the No-Tx interval, the GP interval, and the UpPTS interval a physical random access channel
  • the user terminal may stop transmission of the PRACH preamble at a symbol or subframe boundary.
  • the DwPTS interval When the DwPTS interval is No-Tx, it includes a case where user terminals transmit the PRACH preamble from before the GP interval.
  • the user terminal includes a case in which the PRACH preamble is transmitted only in the GP interval or the UpPTS interval.
  • the user terminal includes a case of transmitting the PRACH preamble using a part of the unlicensed band or the entire unlicensed band.
  • the user terminal may be configured such that the No-Tx section or the rest period by the GP is not occupied by the unlicensed band system after the end of the signal transmission of the DwPTS.
  • the PRACH preamble or the UL subframe may be transmitted after a fixed offset of a predetermined length or less is provided within a GP interval.
  • the user terminal may transmit the PRACH preamble to a corresponding channel of the unlicensed band according to the index information from the base station that scheduled the unlicensed band uplink resource.
  • the base station informs the PRACH channel allocation information of the unlicensed band including the index information using a predetermined message or a PDCCH signal
  • the user terminal corresponds to the unlicensed band channel corresponding to the subframe index of the allocated unlicensed band.
  • the PRACH preamble may be transmitted by occupying.
  • the base station may transmit the message or the PDCCH signal in a licensed or unlicensed band.
  • the base station further informs the bit information indicating whether the number of consecutive UL subframes after the UpPTS through the PRACH channel allocation information, the user terminal is assigned to the first UL subframe after the UpPTS
  • the PRACH preamble may be transmitted in consecutive periods among the No-Tx interval, the GP interval and the UpPTS interval.
  • the user terminal may access and occupy the corresponding unlicensed band channel within a UL window section of a predetermined length.
  • a channel occupancy method for coexisting with an unlicensed band system and using an unlicensed band as a secondary includes a DL (Downlink) subframe and an UL (Uplink) subframe. Between frames, a special subframe consisting of a downlink pilot time slot (DwPTS) for transmitting a DL signal, a guard period (GP) for variable length, and an uplink pilot time slot (UpPTS) for a UL signal transmission are used. Determining, by the base station, either Self Scheduling or Cross Carrier Scheduling to occupy an uplink channel of the band;
  • DwPTS downlink pilot time slot
  • GP guard period
  • UpPTS uplink pilot time slot
  • the DwPTS signal including information about the unlicensed band UL channel within the UL window period is transmitted based on the transmission from the licensed band to the user terminal.
  • Uplink data may be received.
  • uplink data based on detecting a physical random access channel (PRACH) preamble of an unlicensed band received from the user terminal within the UL window period Can be received.
  • PRACH physical random access channel
  • the PRACH preamble may be transmitted in consecutive periods of the No-Tx interval, the GP interval, and the UpPTS interval. .
  • the PRACH preamble is transmitted to the special subframe in the special subframe within the UL window period notified from the base station.
  • the uplink data may be transmitted to the base station.
  • the uplink data may be transmitted to the base station.
  • a channel occupancy method for coexisting with an unlicensed band system and using an unlicensed band as a secondary includes a DL (Downlink) subframe and an UL (Uplink) subframe. Between frames, a special subframe consisting of a downlink pilot time slot (DwPTS) for transmitting a DL signal, a guard period (GP) for variable length, and an uplink pilot time slot (UpPTS) for a UL signal transmission are used.
  • DwPTS downlink pilot time slot
  • GP guard period
  • UpPTS uplink pilot time slot
  • the base station Determining, by the base station, one of Self Scheduling or Cross Carrier Scheduling to occupy a downlink channel of a band; in the Self Scheduling, the base station includes a signal for occupying an unlicensed band resource at a predetermined transmission time point. Transmitting one subframe data to a user terminal through an unlicensed band; And subframe data generated by the base station in a cross carrier scheduling, including an unlicensed band resource occupancy signal at a predetermined transmission time when the unlicensed band system does not occupy the unlicensed band to a user terminal through an unlicensed band and a licensed band. Transmitting.
  • the data is loaded in all slots of the corresponding subframe, or the subframe data is generated so that the data is loaded only in the second slot of the corresponding subframe.
  • the user terminal may receive and demodulate unlicensed band downlink data based on the unlicensed band resource occupancy signal for receiving and detecting an unlicensed band downlink signal from the base station during an unlicensed band activation period.
  • the unlicensed band frame structure of the present invention using a special subframe and the preamble configuration and transmission method of the PRACH (Physical Random Access Channel) channel are unlicensed bands such as WiFi. It can occupy unlicensed resources without conflict or interference with the system.
  • an uplink- allocated terminal does not allow an unlicensed band system to occupy a channel first. It is possible to reliably occupy this unlicensed band channel.
  • the system is classified into Cross Carrier Scheduling using a licensed band and Self Scheduling using a downlink of an unlicensed band.
  • the frequency coexistence wireless communication system of the present invention can stably occupy non-contiguous unlicensed band resources.
  • 1 shows a special subframe of an existing LTE system.
  • FIG. 2 shows a configuration table of a special subframe of an existing LTE system.
  • FIG. 3 is a view for explaining an environment of a frequency shared wireless communication system according to an embodiment of the present invention.
  • FIG. 4A shows a special subframe according to an embodiment of the present invention.
  • 4B shows a case in which a UL subframe is included in a special subframe according to an embodiment of the present invention.
  • 5 to 8 show various embodiments of DwPTS in a special subframe of the present invention.
  • 9 to 12 show configuration examples of UpPTS and PRACH of the special subframe of the present invention.
  • 13A and 13B illustrate a PRACH preamble applied to the present invention.
  • 16 shows examples for describing a PRACH preamble transmission time point according to an embodiment of the present invention.
  • FIG 17 shows an example of a T-PRACH configuration of an unlicensed band special subframe without downlink data transmission according to an embodiment of the present invention.
  • FIG. 19 shows an example in which PRACH information to be used by a UE is delivered directly or indirectly from a PCell PDCCH according to an embodiment of the present invention.
  • 20 is an example of PRACH information to be used indirectly by a UE from a PDCCH to which a PCell PUSCH is allocated according to an embodiment of the present invention.
  • 21 is another example of PRACH information to be used indirectly by a UE from a PDCCH to which a PCell PUSCH is allocated according to an embodiment of the present invention.
  • FIG. 22 illustrates examples of a time point and a signal for transmitting uplink data according to transmission time information of a DwPTS according to an embodiment of the present invention.
  • FIG. 23 shows an uplink resource allocation sequence of an NB in a frequency common wireless communication system according to an embodiment of the present invention.
  • 24 is a flowchart illustrating a UL data transmission sequence of a UE in a frequency shared wireless communication system according to an embodiment of the present invention.
  • FIG. 25 is a diagram illustrating downlink channel occupancy and data transmission sequence of an NB in a frequency common wireless communication system according to an embodiment of the present invention.
  • FIG. 26 illustrates a downlink data reception order of a UE in a frequency shared wireless communication system according to an embodiment of the present invention.
  • FIGS. 5 to 8 further illustrate various embodiments of DwPTS in addition to FIGS. 5 to 8 in a special subframe of the present invention.
  • 28A-28J further illustrate various embodiments of UpPTS and PRACH in addition to FIGS. 9-12 in the special subframe of the present invention.
  • 1 shows a special subframe of an existing LTE system.
  • 2 shows a configuration diagram of a special subframe of an existing LTE system.
  • the special subframe of the existing LTE system as shown in Figure 1 DwPTS of the DL (Downlink, downlink) signal, UpPTS of the UL (Uplink, uplink) signal, and uplink / downlink propagation It is composed of GP (Guard period) considering the propagation time.
  • Downlink Pilot Time Slot (DwPTS) and GP are composed of the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols as shown in FIG. 2 according to the Cyclic Prefix (CP) configuration conditions, and Uplink Pilot Time Slot (UpPTS) is configured as one or two OFDM symbols. It is composed.
  • OFDM Orthogonal Frequency Division Multiplexing
  • CP Cyclic Prefix
  • UpPTS Uplink Pilot Time Slot
  • the DwPTS is used to transmit a control signal (Cntl) and to transmit data such as a primary synchronization signal (PSS), a physical downlink shared channel (PDSCH), and a reference signal.
  • UpPTS is used to transmit a Physical Random Access Channel (PRACH) for UL synchronization and a Sounding Reference Signal (SRS) for UL channel state estimation.
  • PRACH Physical Random Access Channel
  • SRS Sounding Reference Signal
  • GP is a fixed time from the base station (NB) point of view, but from the viewpoint of each user terminal (UE) is a different length by the radio wave arrival time according to the distance between the NB and the UE. That is, since the UE must transmit the UL transmission signal to the NB at the correct timing, in the NB, the far-away UE transmits the signal first compared to the UE close to the NB.
  • FIG 3 is a view for explaining the environment of the frequency shared wireless communication system 100 according to an embodiment of the present invention.
  • the common frequency use wireless communication system 100 is a wireless local area network (WLAN) according to a protocol such as a base station (NB), user terminal (s) (UE), and WiFi. ) Systems and the like.
  • WLAN wireless local area network
  • NB base station
  • UE user terminal
  • WiFi Wireless Fidelity
  • the NB may be in the form of a mobile communication base station Node B, an eNB, a home-eNB, a relay station, a remote radio head (RRH), an access point (AP), or the like.
  • the NB relays a UE in a macrocell to a mobile communication service through a backhaul in a licensed band according to a mobile communication protocol such as Long Term Evolution (LTE).
  • LTE Long Term Evolution
  • the WLAN system may be in the form of an access point (AP) that forms a small cell such as a pico cell, a femto cell, and the like.
  • the WLAN system relays a UE in the small cell using a license-free band (for example, 5 GHz band) according to a protocol such as WLAN to receive WLAN communication services such as the Internet through a sidehaul.
  • a license-free band for example, 5 GHz band
  • 4A shows a special subframe according to an embodiment of the present invention.
  • 4B shows a case in which a UL subframe is included in a special subframe according to an embodiment of the present invention.
  • a licensed assisted access (LAA) in order to coexist with an unlicensed band system and use an unlicensed band as a secondary, a licensed assisted access (LAA), Special
  • the subframe includes a DwPTS of a DL signal, an UpPTS of an UL signal, and a GP (Guard period) in consideration of propagation time of an uplink / downlink.
  • LAA licensed assisted access
  • a period for not transmitting a signal (No-Tx), carrier sensing for sensing a channel ( It is used for any one or more of the Carrier Sensing section, the back-off section for accessing the channel through the back-off counter.
  • the presence, location, and size (length) of each section for each function constituting the DwPTS section may be variously made.
  • the GP length may also be variable, and its length may be known according to predetermined configuration information, or may be calculated computationally when the DwPTS and UpPTS lengths are defined.
  • the UE may perform a Clear Channel Assessment (CCA) or Extended CCA function for searching for an optimal channel.
  • CCA Clear Channel Assessment
  • Extended CCA Extended CCA function for searching for an optimal channel.
  • FIG. 5 carrier sensing, back-off, reserved signal (or preamble) section in a DL subframe.
  • DwPTS with control signal / data DwPTS with control signal / data
  • FIG. 6 DwPTS with control signal / data
  • FIG. 7 DwPTS with carrier sensing, back-off, preamble section
  • FIG. 8 DwPTS with No-Tx, Reserved Signal (or Preamble) (or Preamble) (or Preamble)
  • PDCCH, PDSCH Packet Control Signal
  • FIGS. 27A-27L DwPTS with No-Tx, Reserved Signal
  • control signals such as a PDCCH, data such as a PDSCH and a reference signal, carrier sensing in a DL subframe and a DwPTS, back-off, reserved signal (or preamble), and no-tx. It will be appreciated that combinations comprising one or more of these may be suitably dispersed and used.
  • the uplink channel occupancy signal Reserved Signal (or Preamble) a signal used for the DL may include a signal for indicating that the resource for the UL or DwPTS.
  • UpPTS is used to transmit a Physical Random Access Channel (PRACH) preamble for UL synchronization and a Sounding Reference Signal (SRS) for UL channel state estimation.
  • PRACH Physical Random Access Channel
  • SRS Sounding Reference Signal
  • UpPTS may be composed of a plurality of OFDM symbols, and additionally, UL subframes may be included after UpPTS as shown in FIG. 4B, and transmission of data such as PUSCH (Physical Uplink Shared Channel) and PUCCH (Physical Uplink Control) through UL subframes. Control signal such as a channel) can be transmitted.
  • PRACH is a channel for transmitting a PRACH preamble.
  • the PRACH preamble may be transmitted during the GP after the DwPTS, and the transmission time may be configured to be shorter than the minimum time required for the WLAN system such as WiFi to occupy the channel.
  • UpPTS may be composed of an SRS and a PRACH, and the PRACH may be allocated for various purposes unlike the PRACH of the existing license band.
  • one or more UL subframes may be allocated, and data may be transmitted to UL from a second slot of two slots of the special subframe according to the size of DwPTS. In this case, RBs of consecutive uplink slots and subframes may be allocated to the same UE.
  • FIG. 9 to 12 An example configuration of UpPTS and PRACH of a special subframe for unlicensed band use in the frequency common wireless communication system 100 of the present invention is shown in Figs. 9 to 12, and more embodiments are shown in Figs. 28A to 28J. It is.
  • a general PRACH in which a plurality of UEs UE1, UE2, and UE3 can use an entire section of a special subframe for UL channel access is possible.
  • T-PRACH Trusted-PRACH
  • Synch-PRACH for periodic UL synchronization, etc.
  • T-PRACH is a channel that can be used for each UE to occupy resources in the UpPTS and GP intervals.
  • the PRACH is configured to be larger than the SC-FDM symbol size or may not be transmitted according to an uplink symbol boundary according to a transmission time difference. Therefore, the PRACH is a channel capable of stopping transmission on a sample basis.
  • the PRACH may be transmitted in the form of PRACH Format (Configuration) 0,1,2,3,4 (see FIGS. 13A and 13B), and the T-PRACH may be allocated to an UpPTS or may be transmitted only to a GP.
  • PRACH preamble transmission may be stopped in consideration of resource allocation with SRS and Uplink TS in the UpPTS.
  • the UE may stop transmission at the symbol or subframe boundary in the PRACH Preamble transmission of the unlicensed band.
  • the SYNCH-PRACH is transmitted in an UpPTS section of the same RB as the T-PRACH or consists of an RB defined separately from the SRS in the UpPTS, and can be used to periodically perform unlicensed uplink synchronization.
  • FIG. 10 illustrates a case where a plurality of UEs UE1, UE2, and UE3 simultaneously transmit PRACH preambles to a plurality of PRACHs. Even when the PRACH is transmitted in the DwPTS of FIG. 10, the T-PRACH and the SYNCH-PRACH may be transmitted in the UpPTS period.
  • FIG. 11 is a schematic diagram assuming only a general PRACH, indicating that UEs may transmit a PRACH preamble prior to a GP interval when the DwPTS before the GP is a No-Tx interval. This may be the case when the last section is No-Tx after DL data is transmitted to the DwPTS, or when the UEs randomly access and occupy the channel without any transmission to the DwPTS.
  • UEs can transmit a PRACH preamble using consecutive periods among No-Tx intervals, GP intervals, and UpPTS intervals.
  • a PRACH is allocated to an unlicensed band full channel rather than some subbands.
  • a UE transmits a new PRACH Preamble, a UE transmits a plurality of PRACH preambles, or a plurality of UEs. Preamble can be transmitted.
  • the UE of the present invention as shown in Figure 13a and 13b, CP (Cyclic Prefix), Sequence, GT (Guard Time) in the PRACH Format (Configuration) 0, 1, 2, 3, 4 of the licensed band, such as the existing LTE ),
  • the PRACH preamble having a preamble length and the like can be transmitted.
  • the UE of the present invention SC-FDM (Single-carrier Frequency-division Multiplexing) symbol length of the new configuration (new configuration) generated by allocating samples to 15KHz subcarrier interval (1 / 15k)
  • PRACH preambles in a cyclic manner (Cyclic) in the form of a sequence (e.g., 2048 samples) (see FIG. 14) or a sequence in which a predetermined variable sample length (e.g., a natural number N samples) is added thereto.
  • the conventional PRACH preamble is configured by defining the subcarrier spacing smaller than the normal 15KHz spacing, in the present invention can configure a PRACH preamble of 15KHz subcarrier spacing and use it cyclically.
  • the sequence may be an Nzc-point Zadoff-Chu sequence and may be generated by all or part of information defined by a system information block of the NB.
  • Such a new configuration may be a PRACH preamble generated using a plurality of RBs, rather than a PRACH preamble constrained by an existing 6RB (Resource Block). Therefore, it is also possible to generate a preamble signal having the full channel bandwidth of the unlicensed band.
  • 16 shows examples for describing a PRACH preamble transmission time point according to an embodiment of the present invention.
  • the UE may transmit the PRACH preamble within a predetermined time based on a time point when the signal transmission of the DwPTS is terminated. Accordingly, in the unlicensed band, UEs may have a predetermined length, for example, within a GP interval from the termination time point such that the No-Tx interval or the idle period by the GP after the end of signal transmission of the DwPTS is not occupied by the WLAN system. It is possible to transmit a PRACH preamble or an uplink subframe after a fixed offset of DIFS (Distributed Interframe Space) length (34 ⁇ s) or less.
  • DIFS Distributed Interframe Space
  • the T-PRACH is a channel through which a preamble generated by an existing configuration or a new configuration is transmitted during a period of No-Tx of a GP or a DwPTS. As shown in FIGS. 9 and 10, the T-PRACH stops preamble transmission at an UpPTS start point or a symbol unit boundary of an UpPTS. Means a PRACH channel. SRS and Synch-PRACH may be allocated to the UpPTS section, and PRACH preamble transmission may be stopped in the UpPTS section even when the PRACH Preamble signal is longer than the UpPTS section.
  • Synch-PRACH is for the purpose of periodic synchronization of the uplink of the unlicensed band and is similar to the conventional PRACH Preamble Configuration 4 (see FIG. 13B).
  • the preamble to be defined and transmitted as Synch-PRACH may be configured 4 and may transmit a new preamble sequence (see FIGS. 14 and 15).
  • the unlicensed band uplink may belong to the same technical architecture group (TAG) as the uplink Timing Advance of the licensed band, so the approximate time synchronization can be set to the preamble as before, but to compensate for errors due to the characteristics of the channel, Synch- The PRACH may be transmitted.
  • TAG technical architecture group
  • the PRACH channel is a channel for randomly selecting and transmitting a preamble by the UE.
  • channel transmission power and PRACH resources must be determined in advance.
  • a predetermined total RB or multiple RBs of 6 RB or more may be configured as PRACH channels.
  • the time domain of the PRACH channel is allocated to the UpPTS interval and the UE should perform timing advance, the T-PRACH may be allocated only to the GP interval before the UpPTS. If there is an RB to which an SRS is allocated in the UpPTS, it may be defined that a T-PRACH is allocated to a GP interval.
  • the UE may randomly select all or some subbands of the PRACH resources and transmit preambles, and may provide index information (eg, UCI, uplink control information, uplink control information) of the PDCCH from the NB that has scheduled the unlicensed band uplink resource. It may be utilized to identify and apply a PRACH channel index for each UE.
  • the UE may calculate the PRACH channel through the PDCCH information.
  • the NB may determine a PRACH preamble to be transmitted among the Normal PRACH, T-PRACH, and Synch-PRACH, or the UE may arbitrarily determine and transmit one of three PRACHs.
  • the T-PRACH may be transmitted in the No-Tx or GP interval and the Synch-PRACH may be transmitted in the UpPTS interval (see FIGS. 17 and 18).
  • the NB may designate a PRACH channel through a predetermined message.
  • each UE may be statically allocated, and a UE not allocated with UL may transmit a T-PRACH if necessary.
  • 80% or more of the total channel bandwidth must be occupied, so UEs may transmit the T-PRACH in the full band (Full-T PRACH) without allocating PRACH resources for the T-PRACH (see FIG. 18).
  • PRACH resources may be allocated in every 6RB unit, and a UE to transmit a preamble may be designated for each PRACH.
  • 17 and 18 illustrate a T-PRACH configuration example of a new special subframe considering only the case of uplink transmission without downlink data transmission. This indicates a structure in which UEs can transmit a PRACH preamble and uplink resources after transmitting a channel reserved signal after performing carrier sensing and back-off by the NB during DwPTS.
  • the PRACH Preamble may be transmitted by the UE after the downlink signal ends and before the WLAN system occupies the channel.
  • channel sensing and / or back-off may be performed as necessary and a PRACH preamble may be transmitted. At this time, it may occupy the entire channel bandwidth (Full-T PRACH), or may occupy only part of the subbands and transmit.
  • the UE is a fixed resource or subframe.
  • the PRACH preamble may be transmitted according to a specified pattern for each frame.
  • the NB may be informed of the number of subframes to be used during the uplink burst through the UL grant information.
  • One of the methods is to transmit the number of subframes in the UCI information of the PDCCH.
  • the NB may not transmit a response signal according to the detection of another UE that is not correct, and thus the same back-off value to the UEs. Can be used. To this end, when allocating resources, the NB may inform all scheduled UEs of a back-off counter value.
  • the PRACH channel for the UE to transmit the preamble may be randomly selected by the UE, or may inform the channel index through the PDCCH in the NB.
  • the PRACH channel may be directly allocated in the PDCCH, the location information of the uplink PUSCH (in the next subframe), or the index information (eg, UCI, Uplink Control Information, uplink control information) of the PDCCH scheduling the PUSCH. It can be determined using the information.
  • 19 shows an example in which PRACH information to be used by a UE is delivered directly or indirectly from a PCell PDCCH according to an embodiment of the present invention.
  • 20 is an example of PRACH information to be used indirectly by a UE from a PDCCH to which a PCell PUSCH is allocated according to an embodiment of the present invention.
  • 21 is another example of PRACH information to be used indirectly by a UE from a PDCCH to which a PCell PUSCH is allocated according to an embodiment of the present invention.
  • a PRACH channel is allocated according to whether a cell of a PCell (Primary Cell) of a licensed band or a SCell (Secondary Cell) of an unlicensed band is used.
  • the scheduling scheme in the NB for notifying the PDCCH may be different.
  • the UE when the NB schedules in the PCell and informs the UE of PRACH channel allocation information of an unlicensed band in which a predetermined message or index information is included in a PDCCH signal, the UE attaches to a subframe index of the allocated unlicensed band.
  • PRACH Preamble can be transmitted by occupying the corresponding channel, but when the channel is difficult to occupy in the subframe index of the actually allocated unlicensed band, the unlicensed band channel is accessed in the uplink in the UL window section of a predetermined length (eg, UpPTS / UL section) to occupy (see Figs. 19 and 20). If, as shown in FIG.
  • a special subframe is configured after the DL subframe in the unlicensed band and then allocated a UL subframe, the NB unlicensed band to the UE with a predetermined message in the unlicensed band SCell or index information of the PDCCH. May notify the PRACH channel assignment of the.
  • UEs may designate and occupy channels of uplink subframes after the unlicensed band UpPTS according to parameters defined in the system.
  • UEs may transmit data by occupying the same channel for a certain number of subframes.
  • the NB may further include a bit for acknowledging the first of consecutive UL subframes after the UpPTS, or a bit information for acknowledging the order thereof. Can be notified.
  • the UE checks the position of the UL subframe allocated to the UE from the special subframe (PDCCH, etc.), and if it is allocated to the first UL subframe after UpPTS, as described above, No-Tx,
  • the PRACH preamble may be transmitted in a GP or UpPTS period.
  • FIG. 22 illustrates examples of a time point and a signal for transmitting uplink data according to transmission time information of a DwPTS according to an embodiment of the present invention.
  • Special Subframe may be utilized as Request To Send (RTS), Clear To Send (CTS), and the like.
  • RTS Request To Send
  • CTS Clear To Send
  • DwPTS interval signal may be used as a signal for RTS (notifying to send data)
  • CTS Clear To Send
  • the NB may designate a UE to which UpPTS should be transmitted when receiving a corresponding DwPTS only for a specific UE.
  • the UE may receive data from the NB in a DL subframe according to a predetermined signal of the DwPTS, and according to transmission time information included in the predetermined signal of the DwPTS, the UE should transmit uplink data.
  • the corresponding signal UpPTS or UL subframe signal
  • FIG. 23 is a diagram illustrating an uplink resource allocation order of an NB in a frequency common wireless communication system 100 according to an embodiment of the present invention.
  • an NB may activate or deactivate an unlicensed band cell to a UE that will utilize an unlicensed band.
  • the NB determines that allocation of an uplink channel is necessary for the UE to use the unlicensed band according to a predetermined algorithm (S110).
  • the NB determines any one of Self Scheduling or Cross Carrier Scheduling, and transmits corresponding information to the UE to request activation of an unlicensed band cell (S120).
  • NB is a UL resource in a (N + k + i) subframe of the unlicensed band in a predetermined subframe of the unlicensed band, for example, the (N + i) th subframe. And allocate a (N + k + i-1) subframe between the DL and the UL as a special subframe (S140).
  • N and k may be positive integers
  • i may be 0 or positive integers.
  • the NB may notify the UE of the information allocated in the DwPTS section in the Special Subframe, which is the (N + k + i-1) subframe, through a predetermined message or a PDCCH signal in the unlicensed band (S141).
  • each UE is informed of the number of subframes to be continuously occupied with the corresponding RB information, so that each UE can use multiple UL subframes in one scheduling.
  • Each UE detects, receives, and stores the signals defined above in the activated unlicensed band cell, transmits the PRACH preamble, SRS as described above to the NB, occupies the unlicensed band, and acquires UL data through the corresponding unlicensed band occupation. Can be transmitted.
  • the NB may receive PRACH Preamble and SRS to determine time synchronization and channel state to receive and demodulate data.
  • NB is UL in a predetermined subframe of the licensed band, for example, in the (N + i) th subframe, in the (N + m + i) subframe of the unlicensed band.
  • a resource (PUSCH channel) is allocated (S150).
  • m may be a positive integer.
  • the NB may inform the UE of the determined UL Window and UL resource (PUSCH channel) information through a predetermined message.
  • the NB senses the allocated unlicensed band channel (UL resource) and occupies the channel in advance (or occupied) from (N + i) to (N + m + i-1) subframes (S160).
  • the NB may notify the UE of UL resource (PUSCH channel) information, etc. allocated as above in the DwPTS section through a predetermined message or a PDCCH signal (S177).
  • PUSCH channel UL resource
  • S177 a PDCCH signal
  • each UE is informed of the number of subframes to be continuously occupied with the corresponding RB information, so that each UE can use multiple UL subframes in one scheduling.
  • the UE may not transmit data in the allocated subframe, but may transmit data in the entire allocated subframe or may transmit data only in the second slot.
  • the NB may receive the SRS from the UE, determine the channel state, and receive and demodulate uplink data of the next UL subframe (S178).
  • steps S180 to S184 when sensing an unlicensed band channel (UL resource) allocated by the NB and failing to occupy the channel in advance from (N + i) to (N + m + i-1) subframes (S160), steps S180 to S184.
  • the above scheduling is canceled and the corresponding information is deleted ( S185).
  • the NB When receiving the unlicensed PRACH preamble (see S267) from the UE in the special subframe period (S182), the NB receives the SRS in the UpPTS period from the UE to determine the channel state to receive uplink data of the next UL subframe. It can be demodulated (S186).
  • 24 is a flowchart illustrating an uplink data transmission sequence of a UE in a frequency shared wireless communication system 100 according to an embodiment of the present invention.
  • the UE upon receiving an unlicensed band cell activation request (see S120) from an NB, the UE transmits a corresponding response (S210).
  • the UE receives an unlicensed band downlink PDCCH signal (see S140 and S141) from the NB (S230).
  • the UE in case of self scheduling (S231), if the UE is allocated the first UL subframe after the DL (first UL subframe after the Special Subframe) (S232), as described above in the Special Subframe, No-Tx interval, GP interval, In operation S233, the PRACH preamble is transmitted to the NB using a consecutive period of the UpPTS period. Accordingly, the UE may transmit SRS, UL data, etc. through the corresponding unlicensed band occupation (S234).
  • the UE receives a predetermined message (see S150) from the NB and confirms scheduling information (S240). That is, the UE may identify the UL Window (a) and identify (or calculate) UL resource (PUSCH channel) information, that is, an uplink subframe initial allocation position (N + m + i) subframe.
  • UEs can transmit a PRACH Preamble (eg, normal PRACH T-PRACH, Sync-PRACH) to the NB (S267). Subsequently, the UE may transmit an SRS and the like in addition to the PRACH preamble in the UpPTS period to the NB, and may transmit uplink data of the allocated UL subframe to the NB (S268).
  • PRACH Preamble eg, normal PRACH T-PRACH, Sync-PRACH
  • the UE senses the allocated unlicensed band channel and does not occupy the corresponding channel from (N + i) to (N + m + i-1) in advance (S250), as in steps S270 to S274, n If the DwPTS is not received from the NB from (N + i) to UL Window (a) while increasing from 0 to 1, the storage of the corresponding scheduling information is canceled and deleted (S275).
  • the UE When receiving the DwPTS (see S177) from the NB (S272), the UE transmits the PRACH Preamble (eg, T-PRACH, Sync-PRACH) to the NB (S276), after which the UE PRACH Preamble in the UpPTS period to the NB
  • the SRS may be transmitted and uplink data of the allocated UL subframe may be transmitted to the NB (S268).
  • FIG. 25 is a diagram illustrating downlink channel occupancy and data transmission sequence of an NB in a frequency common wireless communication system according to an embodiment of the present invention.
  • the NB determines that unlicensed band downlink resource allocation is necessary (S310), the NB determines one of Self Scheduling or Cross Carrier Scheduling, and transmits the relevant information to the UE to exempt the license. Request activation of the band cell (S320).
  • the NB performs carrier sensing on whether the unlicensed band can be occupied in advance and according to a predetermined back-off counter value (S332), the signal for occupying the unlicensed band resource (or preamble).
  • the transmission possible point of time (subframe) is checked (S332).
  • the NB may check or calculate a data processing time for an unlicensed band resource occupying signal in consideration of a transmittable time point (subframe), and confirm or calculate a signal length (number of OFDM symbols) that can be transmitted in a corresponding subframe period. (S333).
  • the NB determines the transmission time (subframe) and the length of the signal of the final unlicensed band resource occupancy signal (S334), and performs back-off with the CCA searching for the optimal channel.
  • the signal (or preamble) for occupying the corresponding unlicensed band resource at the transmission time point (subframe) is performed.
  • Subframe data including the transmission is transmitted to the UE through the unlicensed band (S337).
  • the scheduling scheme is Cross Carrier Scheduling (S330)
  • the NB refers to the generation of the Explicit PDCCH (including the actual amount of resources used) in the licensed band cell (340)
  • the NB checks or calculates a data processing time for an unlicensed band resource occupancy signal in consideration of a transmittable time point (subframe), and checks or calculates a signal length (number of OFDM symbols) that can be transmitted in a corresponding subframe period.
  • Subframe data including the corresponding unlicensed band resource occupancy signal (or preamble) is generated (S352).
  • data may be loaded in a fixed slot usage method of the unlicensed band, that is, the entire slot of the subframe, and may be generated so that the data is loaded only in the second slot which is the rear part of the subframe.
  • the NB When the corresponding subframe data is generated (S352) and the unlicensed band is used, the NB performs back-off with CCA searching for an optimal channel (S353), and the back-off counter value is reduced to 0, and another WLAN system If the unlicensed band is not occupied (S354), the subframe data including the unlicensed band resource occupancy signal (or preamble) is transmitted to the UE through the unlicensed band at the transmission time (subframe) (S355). ).
  • the corresponding subframe data is transmitted when the subframe data including the unlicensed band resource occupancy signal (or preamble) is transmitted through the unlicensed band. It is possible to transmit to the UE through the licensed band (S356).
  • the NB performs carrier sensing on whether the unlicensed band can be occupied in advance.
  • the transmission time point (subframe) of the unlicensed band resource occupancy signal (or preamble) is checked according to a predetermined back-off counter value (S361).
  • the NB checks or calculates a data processing time for an unlicensed band resource occupancy signal in consideration of a transmittable time point (subframe), and checks or calculates a signal length (number of OFDM symbols) that can be transmitted in a corresponding subframe period.
  • Subframe data including the corresponding unlicensed band resource occupancy signal (or preamble) is generated (S352).
  • an unlicensed band selection method of the unlicensed band that is, the data may be loaded in the entire slot of the subframe, and in this case, the data may be generated only in the second slot that is later in the subframe, or arbitrarily slot without slot allocation.
  • the selected and used subframe data may be generated.
  • the NB When the corresponding subframe data is generated (S362) and the unlicensed band is used, the NB performs back-off with the CCA searching for the optimal channel (S363), and the back-off counter value is reduced to 0, and another WLAN system If the unlicensed band is not occupied (S364), the subframe data including the unlicensed band resource occupancy signal (or preamble) is transmitted to the UE through the unlicensed band at the transmission time (subframe) (S365). ).
  • the subframe data including the unlicensed band resource occupancy signal (or preamble) is transmitted through the unlicensed band according to channel conditions.
  • Subframe data may be transmitted to the UE through the licensed band (S366).
  • FIG. 26 illustrates a downlink data reception order of a UE in a frequency shared wireless communication system according to an embodiment of the present invention.
  • the UE upon receiving an unlicensed band cell activation request (see S320) from an NB, the UE transmits a corresponding response (S410).
  • the UE receives the unlicensed band downlink signal from the NB (S421), and the subframe data including the unlicensed band resource occupancy signal (or preamble) (see S337). Is detected (S422). Based on this, the UE may receive and demodulate downlink data from the NB (S423).
  • the scheduling scheme is Cross Carrier Scheduling (S420)
  • the UE refers to the Explicit PDCCH from the NB (S430)
  • the UE receives a downlink signal from the NB (S440).
  • the unlicensed band resource occupancy signal (or preamble) S355 / S356, which is Cross Carrier Scheduling information in NB, may be extracted and received and demodulated based on the unlicensed band downlink data (S441).
  • the UE when the UE does not reference the Explicit PDCCH from the NB (S430), during the unlicensed band cell activation period, the UE receives a downlink signal from the NB (S450) and the unlicensed band resource which is Cross Carrier Scheduling information in the NB.
  • the occupied signal (or preamble) S365 / S366 is extracted and the unlicensed band downlink signal is received based on this (S451).
  • the unlicensed band downlink data may be received and demodulated according to the cross carrier scheduling information (S453).
  • WiFi may be configured by a preamble configuration and transmission method of an unlicensed band frame structure and a physical random access channel (PRACH) channel using the special subframe. It can occupy unlicensed band resources without collision or interference with unlicensed band systems.
  • PRACH physical random access channel
  • an uplink- allocated terminal does not allow an unlicensed band system to occupy a channel first. It is possible to reliably occupy this unlicensed band channel.
  • the system is classified into Cross Carrier Scheduling using a licensed band and Self Scheduling using a downlink of an unlicensed band.
  • the frequency coexistence wireless communication system of the present invention can stably occupy non-contiguous unlicensed band resources.

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

Abstract

La présente invention concerne une occupation de canal dans un système de communication sans fil à partage de spectre, et comprend : 1) un procédé de configuration et d'émission d'une structure de trame pour bande sans licence à l'aide d'une sous-trame spéciale et un préambule de canal d'accès aléatoire physique (PRACH) pour occuper des ressources dans une bande sans licence sans collision ni interférence de la part d'un système de bande sans licence tel que WiFi, etc. 2) un procédé d'émission de signal pour occuper un canal dans un intervalle de période de garde (GP) dans le cas d'un terminal auquel une liaison montante est attribuée, de sorte qu'un système de bande sans licence ne peut ne pas occuper le canal en premier ; et 3) un procédé de planification de ressources en liaison montante à partir de la perspective d'une station de base et d'un terminal, en tenant compte des circonstances d'occupation de ressources discrète d'une bande sans licence, en séparant la planification de porteuse croisée à l'aide d'une bande sous licence d'une part et la planification automatique à la ide d'une liaison descendante d'une bande sans licence d'autre part.
PCT/KR2016/000225 2015-02-09 2016-01-11 Procédé d'occupation de canal dans un système de communication sans fil à partage de spectre Ceased WO2016129809A1 (fr)

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KR10-2015-0019619 2015-02-09
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KR10-2016-0000274 2016-01-04
KR1020160000274A KR20160098031A (ko) 2015-02-09 2016-01-04 주파수 공동사용 무선통신시스템의 채널점유 방법

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Publication number Priority date Publication date Assignee Title
US12114367B2 (en) 2015-08-26 2024-10-08 Panasonic Intellectual Property Corporation Of America Random access procedure for unlicensed cells
CN109586874A (zh) * 2017-09-29 2019-04-05 中国移动通信有限公司研究院 一种特殊子帧的配置方法、检测方法、基站及终端
CN109586874B (zh) * 2017-09-29 2021-08-06 中国移动通信有限公司研究院 一种特殊子帧的配置方法、检测方法、基站及终端
CN111630927A (zh) * 2018-01-23 2020-09-04 高通股份有限公司 Nr-ss lbt间隙优化
CN111630927B (zh) * 2018-01-23 2023-06-02 高通股份有限公司 Nr-ss lbt间隙优化
US11870633B2 (en) 2018-01-23 2024-01-09 Qualcomm Incorporated NR-SS LBT gap optimizations
CN112586058A (zh) * 2018-07-27 2021-03-30 Oppo广东移动通信有限公司 无线通信方法和设备
CN112586058B (zh) * 2018-07-27 2023-11-17 Oppo广东移动通信有限公司 无线通信方法和设备
CN112335322A (zh) * 2018-08-09 2021-02-05 松下电器（美国）知识产权公司 涉及改进的非授权小区的不连续接收的用户设备和基站
CN112335322B (zh) * 2018-08-09 2024-03-26 松下电器（美国）知识产权公司 涉及改进的非授权小区的不连续接收的用户设备和基站
CN114270744A (zh) * 2019-03-20 2022-04-01 沃达丰Ip许可有限公司 多个无线电接入技术干扰减少

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