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WO2021146983A1 - Périodes de trames fixes mal alignées (ffps) de multiples dispositifs de communication sans fil - Google Patents

Périodes de trames fixes mal alignées (ffps) de multiples dispositifs de communication sans fil Download PDF

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Publication number
WO2021146983A1
WO2021146983A1 PCT/CN2020/073717 CN2020073717W WO2021146983A1 WO 2021146983 A1 WO2021146983 A1 WO 2021146983A1 CN 2020073717 W CN2020073717 W CN 2020073717W WO 2021146983 A1 WO2021146983 A1 WO 2021146983A1
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Prior art keywords
wireless communication
communication device
lbt
ffp
bandwidth
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PCT/CN2020/073717
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English (en)
Inventor
Changlong Xu
Jing Sun
Xiaoxia Zhang
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Qualcomm Inc
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Qualcomm Inc
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Priority to PCT/CN2020/073717 priority Critical patent/WO2021146983A1/fr
Publication of WO2021146983A1 publication Critical patent/WO2021146983A1/fr
Anticipated expiration legal-status Critical
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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
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]

Definitions

  • FIG. 1 illustrates a wireless communication network according to one or more aspects of the present disclosure.
  • FIG. 2 illustrates a frame based equipment (FBE) scheme according to one or more aspects of the present disclosure.
  • FBE frame based equipment
  • FIG. 8 is a block diagram of a user equipment (UE) according to one or more aspects of the present disclosure.
  • FIG. 10 is a flow diagram of a communication method according to one or more aspects of the present disclosure.
  • An OFDMA network may implement a radio technology such as evolved UTRA (E-UTRA) , Institute of Electrical and Electronics Engineers (IEEE) 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM and the like.
  • E-UTRA evolved UTRA
  • IEEE Institute of Electrical and Electronics Engineers
  • GSM Global System for Mobile communications
  • LTE long term evolution
  • UTRA, E-UTRA, GSM, UMTS and LTE are described in documents provided from an organization named “3rd Generation Partnership Project” (3GPP)
  • cdma2000 is described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) .
  • 5G networks contemplate diverse deployments, diverse spectrum, and diverse services and devices that may be implemented using an OFDM-based unified, air interface.
  • LTE and LTE-A are further enhancements considered in addition to development of the new radio technology for 5G NR networks.
  • SCS may occur with 15 kHz, for example over 5, 10, 20 MHz, and the like bandwidth (BW) .
  • BW bandwidth
  • SCS may occur with 30 kHz over 80/100 MHz BW.
  • the SCS may occur with 60 kHz over a 160 MHz BW.
  • the SCS may occur with 120 kHz over a 500 MHz BW.
  • An FFP may include a COT followed by an idle period.
  • the COT may include one or more transmission periods, which can be used for UL and/or DL transmissions.
  • the idle period may be defined as being at an end of the FFP, and a BS may perform LBT during the idle period for communicating DL and/or UL transmissions in the next FFP.
  • a COT may include an LBT gap between transmission periods of the COT.
  • the BSs may be unable to communicate DL or UL signals during the aligned idle periods of the FFPs, wasting resources. To use these resources, the BSs may configure the FFPs such that the idle periods of different BSs are staggered.
  • misalign FFPs of different wireless communication devices e.g., misalign FFPs of different BSs, misalign FFPs of different transmission-reception points (TRPs) , misalign FFPs for different component carriers used by the different BSs or TRPs, misalign FFPs for different LBT bandwidths, etc.
  • TRPs transmission-reception points
  • misalign FFPs for different component carriers used by the different BSs or TRPs misalign FFPs for different LBT bandwidths, etc.
  • the starting point of a first FFP of a first wireless communication device is different from the starting point of a second FFP of a second wireless communication device.
  • An advantage of misaligning the first FFP and the second FFP may allow the first wireless communication device to communicate DL and/or UL transmissions during an idle period of the second wireless communication device.
  • an idle period is intended to provide time for the given wireless communication device to perform an LBT for communicating DL or UL signals in the next FFP.
  • An end of an LBT gap in a first FFP of a first wireless communication device may correspond to a starting point of a second FFP of a second wireless communication device. Additionally, the LBT gap of the first wireless communication device may at least partially or wholly overlap with at least a portion of the idle period of the second wireless communication device.
  • An advantage of such a scheme may be that the second wireless communication device is more likely to pass LBT if, for example, the first wireless communication device refrains from transmitting a downlink (DL) communication during the LBT gap. Accordingly, the overall service interruption time is not limited by the idle periods of the FFPs.
  • a small cell such as a femto cell, would also generally cover a relatively small geographic area (e.g., a home) and, in addition to unrestricted access, may also provide restricted access by UEs having an association with the femto cell (e.g., UEs in a closed subscriber group (CSG) , UEs for users in the home, and the like) .
  • a BS for a macro cell may be referred to as a macro BS.
  • a BS for a small cell may be referred to as a small cell BS, a pico BS, a femto BS or a home BS. In the example shown in FIG.
  • the BSs 105d and 105e may be regular macro BSs, while the BSs 105a-105c may be macro BSs enabled with one of three dimension (3D) , full dimension (FD) , or massive MIMO.
  • the BSs 105a-105c may take advantage of their higher dimension MIMO capabilities to exploit 3D beamforming in both elevation and azimuth beamforming to increase coverage and capacity.
  • the BS 105f may be a small cell BS which may be a home node or portable access point.
  • a BS 105 may support one or multiple (e.g., two, three, four, and the like) cells.
  • the network 100 may support synchronous or asynchronous operation.
  • the BSs may have similar frame timing, and transmissions from different BSs may be approximately aligned in time.
  • the BSs may have different frame timing, and transmissions from different BSs may not be aligned in time.
  • the UEs 115 are dispersed throughout the wireless network 100, and each UE 115 may be stationary or mobile.
  • a UE 115 may also be referred to as a terminal, a mobile station, a subscriber unit, a station, or the like.
  • a UE 115 may be a cellular phone, a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wireless local loop (WLL) station, or the like.
  • PDA personal digital assistant
  • WLL wireless local loop
  • a UE 115 may be a device that includes a Universal Integrated Circuit Card (UICC) .
  • a UE may be a device that does not include a UICC.
  • UICC Universal Integrated Circuit Card
  • the UEs 115 that do not include UICCs may also be referred to as IoT devices or internet of everything (IoE) devices.
  • the UEs 115a-115d are examples of mobile smart phone-type devices accessing network 100.
  • a UE 115 may also be a machine specifically configured for connected communication, including machine type communication (MTC) , enhanced MTC (eMTC) , narrowband IoT (NB-IoT) and the like.
  • MTC machine type communication
  • eMTC enhanced MTC
  • NB-IoT narrowband IoT
  • the UEs 115e-115h are examples of various machines configured for communication that access the network 100.
  • the UEs 115i-115k are examples of vehicles equipped with wireless communication devices configured for communication that access the network 100.
  • the BSs 105 may also communicate with a core network.
  • the core network may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions.
  • IP Internet Protocol
  • At least some of the BSs 105 (e.g., which may be an example of a gNB or an access node controller (ANC) ) may interface with the core network through backhaul links (e.g., NG-C, NG-U, etc. ) and may perform radio configuration and scheduling for communication with the UEs 115.
  • the BSs 105 may communicate, either directly or indirectly (e.g., through core network) , with each other over backhaul links (e.g., X1, X2, etc. ) , which may be wired or wireless communication links.
  • UE 115f e.g., a thermometer
  • UE 115g e.g., smart meter
  • UE 115h e.g., wearable device
  • the network 100 may also provide additional network efficiency through dynamic, low-latency TDD/FDD communications, such as vehicle-to-vehicle (V2V) communications among the UEs 115i-115k, vehicle-to-everything (V2X) communications between a UE 115i, 115j, or 115k and other UEs 115, and/or vehicle-to-infrastructure (V2I) communications between a UE 115i, 115j, or 115k and a BS 105.
  • V2V vehicle-to-vehicle
  • V2X vehicle-to-everything
  • V2I vehicle-to-infrastructure
  • the network 100 utilizes OFDM-based waveforms for communications.
  • An OFDM-based system may partition the system BW into multiple (K) orthogonal subcarriers, which are also commonly referred to as subcarriers, tones, bins, or the like. Each subcarrier may be modulated with data.
  • the SCS between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may be dependent on the system BW.
  • the system BW may also be partitioned into subbands or LBT bandwidths. In other instances, the SCS and/or the duration of TTIs may be scalable.
  • the BSs 105 can assign or schedule transmission resources (e.g., in the form of time-frequency resource blocks (RB) ) for downlink (DL) and uplink (UL) transmissions in the network 100.
  • DL refers to the transmission direction from a BS 105 to a UE 115
  • UL refers to the transmission direction from a UE 115 to a BS 105.
  • the communication can be in the form of radio frames.
  • a radio frame may be divided into a plurality of subframes or slots, for example, about 10. Each slot may be further divided into mini-slots. In a FDD mode, simultaneous UL and DL transmissions may occur in different frequency bands.
  • each subframe includes an UL subframe in an UL frequency band and a DL subframe in a DL frequency band.
  • a subframe may also be referred to as a slot.
  • UL and DL transmissions occur at different time periods using the same frequency band.
  • a subset of the subframes (e.g., DL subframes) in a radio frame may be used for DL transmissions and another subset of the subframes (e.g., UL subframes) in the radio frame may be used for UL transmissions.
  • a UE 115 may transmit sounding reference signals (SRSs) to enable a BS 105 to estimate an UL channel.
  • Control information may include resource assignments and protocol controls.
  • Data may include protocol data and/or operational data.
  • the BSs 105 and the UEs 115 may communicate using self-contained subframes.
  • a self-contained subframe may include a portion for DL communication and a portion for UL communication.
  • a self-contained subframe can be DL-centric or UL-centric.
  • a DL-centric subframe may include a longer duration for DL communication than for UL communication.
  • An UL-centric subframe may include a longer duration for UL communication than for DL communication.
  • the network 100 may be an NR network deployed over a licensed spectrum.
  • the BSs 105 can transmit synchronization signals (e.g., including a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) ) in the network 100 to facilitate synchronization.
  • the BSs 105 can broadcast system information associated with the network 100 (e.g., including a master information block (MIB) , remaining system information (RMSI) , and other system information (OSI) ) to facilitate initial network access.
  • MIB master information block
  • RMSI remaining system information
  • OSI system information
  • a UE 115 attempting to access the network 100 may perform an initial cell search by detecting a PSS from a BS 105.
  • the PSS may enable synchronization of period timing and may indicate a physical layer identity value.
  • the UE 115 may then receive a SSS.
  • the SSS may enable radio frame synchronization, and may provide a cell identity value, which may be combined with the physical layer identity value to identify the cell.
  • the PSS and the SSS may be located in a central portion of a carrier or any suitable frequencies within the carrier.
  • the UE 115 may receive a MIB, which may be transmitted in the physical broadcast channel (PBCH) .
  • the MIB may include system information for initial network access and scheduling information for RMSI and/or OSI.
  • the UE 115 may receive RMSI, OSI, and/or one or more system information blocks (SIBs) .
  • the RMSI and/or OSI may include radio resource control (RRC) information related to random access channel (RACH) procedures, paging, control resource set (CORESET) for physical downlink control channel (PDCCH) monitoring, physical UL control channel (PUCCH) , physical UL shared channel (PUSCH) , power control, and SRS.
  • RRC radio resource control
  • SIB1 may contain cell access parameters and scheduling information for other SIBs.
  • the UE 115 can perform a random access procedure to establish a connection with the BS 105. After establishing a connection, the UE 115 and the BS 105 can enter a normal operation stage, where operational data may be exchanged. For example, the BS 105 may schedule the UE 115 for UL and/or DL communications. The BS 105 may transmit UL and/or DL scheduling grants to the UE 115 via a PDCCH. The scheduling grants may be transmitted in the form of DL control information (DCI) .
  • DCI DL control information
  • the network 100 may operate over a system BW or a component carrier (CC) BW.
  • the network 100 may partition the system BW into multiple BWPs (e.g., portions) .
  • a BS 105 may dynamically assign a UE 115 to operate over a certain BWP (e.g., a certain portion of the system BW) .
  • the assigned BWP may be referred to as the active BWP.
  • the UE 115 may monitor the active BWP for signaling information from the BS 105.
  • the BS 105 may schedule the UE 115 for UL or DL communications in the active BWP.
  • the network 100 may be an NR network deployed over a licensed or unlicensed spectrum.
  • the network 100 may operate over a shared channel, which may include shared frequency bands or unlicensed frequency bands, for example, at about 3.5 gigahertz (GHz) , sub-6 GHz or higher frequencies in the mmWav band.
  • a wireless communication device may share resources in the shared communication medium and may employ a listen-before-talk (LBT) procedure to reserve transmission opportunities (TXOPs) in the shared medium for communications.
  • TXOPs may be non-continuous in time and may refer to an amount of time a station can send frames when it has won contention for the wireless medium.
  • Each TXOP may include a plurality of slots and one or more medium sensing periods.
  • a TXOP may also be referred to as channel occupancy time (COT) .
  • COT channel occupancy time
  • the UE 115 may perform an UL transmission or receive a DL transmission from the BS 105. If the channel is not available (performance of the LBT results in an LBT fail) , the UE 115 may back off and perform the LBT procedure again at a later point in time.
  • the FFP may be restricted to particular values (e.g., 1 ms, 2 ms, 2.5 ms, 4 ms, 5 ms, or 10 ms) .
  • the idle period and the FFP may have fixed durations and/or predetermined times.
  • each idle period may include one or more OFDM symbols, and each FFP may include one or more subframes, slots, or TTIs.
  • the FFP may be defined in units of slots (e.g., about 250 microseconds ( ⁇ s) long) .
  • the FFP structure is pre-determined and known by the BSs (e.g., BS 202 and 204 below in FIG. 2) .
  • the BSs may be time-synchronized when operating in the shared spectrum.
  • an idle period for a given SCS may be provided by the equation ⁇ ceiling (minimum idle period allowed by regulations /Ts) ⁇ , where Ts is the symbol duration for the given SCS, and a PRACH resource is considered invalid if it overlaps with the idle period of an FFP when the FBE operation is indicated.
  • An example of the minimum idle period allowed by regulations may be provided by the equation ⁇ maximum (5%of FFP, 100 ⁇ s) .
  • Other examples of minimum idle periods allowed by regulations are within the scope of the present disclosure.
  • FIG. 2 illustrates an FBE scheme 200 according to one or more aspects of the present disclosure.
  • the x-axis represents time in some constant units.
  • the y-axis represents frequency in some constant units.
  • the scheme 200 may be employed by a BS 202, a BS 204, and the UE 115.
  • the BS 202, 204 may correspond to the BS 105 in FIG. 1.
  • FIG. 2 illustrates a plurality of FFPs, each FFP including a COT followed by an idle period.
  • a COT may include one or more transmission periods and one or more LBT gaps.
  • the BS performs an LBT before the start of the FFP during an idle period of the previous FFP.
  • a BS 202 and/or a BS 204 may contend for a medium and perform an LBT.
  • An idle period may also be referred to as an idle duration or a contention period.
  • the pattern-filled boxes of FIG. 2 may represent transmission of PDCCH and/or PDSCH and/or reception of PUCCH and/or PUSCH in a transmission period. While an entire transmission period is pattern-filled, in aspects, a transmission may occur only in a corresponding portion of the transmission period (e.g., in a slot or mini-slot of the transmission period) .
  • the BS 202 and the BS 204 may operate in the same frequency band 206 (e.g., BWP) , but may operate in different LBT bandwidths.
  • An LBT bandwidth may also be referred to as a subband in the present disclosure.
  • the FBE scheme 200 may partition the frequency band 206 into a plurality of LBT bandwidths 208 and 210.
  • the frequency band 206 and the LBT bandwidths 208 and 210 may have any suitable BWs.
  • the frequency band 206 may have a BW of about 40 MHz and may be partitioned into two LBT bandwidths 208 and 210, where each LBT bandwidth may have a BW of about 20 MHz.
  • the BS 202 and the BS 204 may have misaligned FFPs.
  • the FFPs for different LBT bandwidths are misaligned.
  • a first FFP is misaligned with a second FFP if the starting point of the first FFP is different from the starting point of the second FFP.
  • the FFP structure may include a COT followed by an idle period.
  • an FFP 214 a has a starting point at time T0
  • an FFP 214 b has a starting point at time T2
  • an FFP 214 c has a starting point at time T4.
  • the FFP 214 of the BS 202 includes a COT 216 followed by an idle period 218.
  • the BS 202, 204 may configure a time difference 250 between the FFP starting points of the BSs.
  • the time difference 250 may be fixed or predetermined.
  • the time difference 250 is configured between the starting point of the FFP 214 a (of BS 202) and the starting point of the FFP 224 b (of BS 204)
  • the time difference 250 is configured between the starting point of the FFP 214 b (of BS 202) and the starting point of the FFP 224 c (of BS 204)
  • the time difference 250 is configured between the starting point of the FFP 214 c (of BS 202) and the starting point of the FFP 224 d (of BS 204) .
  • An LBT gap 222, 242 may be configured between transmission periods in an FFP.
  • the BS 202 may configure the LBT gap 222 b between transmission periods 220 b1 and 220 b2 in the FFP 214 b .
  • the BS 202 may transmit to a UE 115, a DL communication during a portion of the COT 216 b outside the LBT gap 222 b .
  • the BS 202 may transmit to a UE 115, the DL communication during the transmission periods 220 b1 and/or 220 b2 .
  • An end of the LBT gap 222 b of the BS 202 may correspond to a starting point of the FFP 224 c of the BS 204.
  • the BS 204 may have a higher likelihood of the LBT resulting in an LBT pass compared to if the BS 202 does not refrain from transmitting a DL communication during the LBT gap 222 b .
  • the BS 202 may refrain from transmitting a DL communication during the LBT gap 222 b , thus increasing the likelihood that if the BS 204 performs an LBT during the idle period 228 b at least partially overlapping with the LBT gap 222 b , the LBT will result in an LBT pass.
  • the BS 204 may perform LBT in the LBT bandwidth 210 for communicating DL and/or UL transmissions in the next FFP 224 c for up to a maximum COT 226 c .
  • the BS 204 performs a one-shot LBT during the idle period 228 b , which occurs before the start time T3 of the FFP 224 c and is included in the FFP 224 b immediately preceding the FFP 224 c .
  • a first FFP immediately precedes a second FFP if the first FFP precedes the second FFP and no other FFPs are located between the first and second FFPs.
  • the BS 204 skips the FFP 224 c and contends for the medium again during an idle period 228 c , which is included in the FFP 224 c but occurs before the start of the next FFP 224 d .
  • the BS 204 reserves a COT 226 c and communicates DL and/or UL signals during a transmission period 240 c1 and/or a transmission period 240 c2 in the FFP 224 c .
  • the BS 204 may share the COT 226 c with the UE 115 by transmitting PDCCH at the beginning of the FFP 224 c to the UE 115, where the PDCCH includes information about the COT 226 c .
  • the UE 115 may receive the PDCCH and perform LBT to share the COT 226 c with the BS 204.
  • the BS 204 may refrain from transmitting a DL communication during the LBT gap 242 b , thus increasing the likelihood that if the BS 202 performs an LBT during the idle period 218 b at least partially overlapping with the LBT gap 242 b , the LBT will result in an LBT pass.
  • the BS 202 may perform LBT in the LBT bandwidth 210 for communicating DL and/or UL transmissions in the next FFP 222 b for up to a maximum COT 216 b .
  • the BS 204 performs a one-shot LBT during the idle period 218 b .
  • Each BS may be aware of the FFP structure (e.g., FFP duration, LBT gaps, a fixed time period between the start of FFPs of the BSs operating in the LBT bandwidths, idle periods, transmission periods, etc. ) in which the BS is communicating DL and/or UL transmissions. Accordingly, the BS 202, 204 may schedule the time difference 250 between the start of FFPs of the BS and another BS, the LBT gaps, the idle periods, and/or the transmission periods during an FFP of the BS 202, 204.
  • FFP structure e.g., FFP duration, LBT gaps, a fixed time period between the start of FFPs of the BSs operating in the LBT bandwidths, idle periods, transmission periods, etc.
  • a BS may refrain from transmitting a DL communication during an LBT gap in the FFP. It may be advantageous for the BS to schedule a UE for UL transmissions during the LBT gap and receive the UL transmission during the LBT gap.
  • FIG. 3 illustrates an FBE scheme 300 in which the BS receives UL data during an LBT gap according to one or more aspects of the present disclosure.
  • the x-axis represents time in some constant units.
  • the y-axis represents frequency in some constant units.
  • the scheme 300 may be employed by the BS 202, the BS 204, and the UE 115.
  • FIG. 3 illustrates the FFP 214 and FFP 224, as discussed above in FIG. 2.
  • the pattern-filled boxes of FIG. 3 may represent transmission of PDCCH and/or PDSCH and/or reception of PUCCH and/or PUSCH in a transmission period. While an entire transmission period is pattern-filled, in aspects, a transmission may occur only in a corresponding portion of the transmission period (e.g., in a slot or mini-slot of the transmission period) .
  • the BS 202 may transmit to the UE 115, a DL communication (via a PDCCH) during a portion of the FFP 214 b outside the LBT gap 222 b .
  • the BS 202 may transmit the DL communication during the transmission period 220 b1 , where the DL communication indicates an UL scheduling grant for transmission of UL control information (UCI) and/or UL data.
  • the UE 115 may receive the DL communication indicating the UL scheduling grant for transmitting an UL communication during an UL period (e.g., during the LBT bandwidth 222a) for the FFP 214 a in the LBT bandwidth 208.
  • the BS 202 receives the UL transmission during the idle period 228 b of the BS 204. Additionally, an end of the UL transmission (e.g., transmission of the UL data 302 b ) corresponds to a starting point of the FFP 224 c of the BS 204.
  • the BS 202 is described as transmitting an UL scheduling grant to a UE 115 and receiving UL data 302 b from the UE 115, it should be understood that the BS 204 may transmit an UL scheduling grant to a UE 115 and receiving UL data from the UE 115. In some aspects, the BS 202, 204 may perform similar actions in relation to transmitting an UL scheduling grant to a UE 115 and receiving UL data 302 a , 302 c , 304 b , and/or 304 c from the UE 115.
  • a BS 202, 204 may determine an energy detection threshold for acquiring a COT.
  • the BS 202, 204 may contend for the COT by performing an LBT in a shared channel. Upon passing the LBT, the COT may begin. Accordingly, the BS 202, 204 may acquire the COT based on the energy detection threshold.
  • the BS 202, 204 acquires the COT based on the energy detection threshold if the BS 202, 204 performs LBT using the energy detection threshold and acquires the COT if the LBT results in an LBT pass.
  • the BS 204 may detect energy based on the UL transmission in the LBT bandwidth 208, but does not detect energy above the energy detection threshold when performing the LBT in the LBT bandwidth 210. Accordingly, the BS 204 may acquire the COT despite detection of energy based on the UL transmission in the LBT bandwidth 208.
  • the maximum transmit power of the BS 202, 204 may be higher (e.g., 1 dB, 5 dB, 10 dB, or otherwise) than the maximum transmit power of the UE 115.
  • the receive power at the BS 204 may be lower than the energy detection threshold for the LBT.
  • the power leaked to the LBT bandwidth 210 may be low enough to not trigger detection of energy that is above the energy detection threshold. Accordingly, the UL transmission from the UE 115 may not affect the LBT of the BS 204 when attempting to acquire a COT during the FFP 224 c .
  • the UL transmission in the LBT bandwidth 208 may cause the LBT of the BS 204 to fail. It may be desirable to control the transmit power of the UE 115.
  • the BS 202 may instruct the UE 115 to reduce a transmit power for transmission of the UL communication (e.g., the UL data 302 b ) to increase the likelihood that the LBT performed by the BS 204 during the idle period 228 b results in an LBT pass.
  • FIG. 4 is a signaling diagram of a wireless communication method 400 for reducing the transmit power of the UE according to one or more aspects of the present disclosure.
  • the method 400 may be implemented between a BS 405 and a UE 415.
  • the BS 405 may be similar to the BS 105, 202, or 204 and the UE 415 may be similar to the UE 115. Additionally, the BS 405 and the UE 415 may operate in a network such as the network 100.
  • the method 400 includes a number of enumerated actions, but embodiments of the method 400 may include additional actions before, after, and in between the enumerated actions. In some aspects, one or more of the enumerated actions may be omitted or performed in a different order.
  • the BS 505 transmits an indication to the UE 415 to reduce a transmit power of the UE 415.
  • the UE 415 reduces the transmit power of the UE 415.
  • the UE 415 transmits UL data in accordance with the reduced transmit power of the UE 415.
  • the BS 505 receives the UL data in accordance with the reduced transmit power of the UE 415.
  • the BS 505 may receive the UL data during an LBT gap that overlaps with an idle period of another BS.
  • the BS 405 may use a power control enhancement. For example, the BS 405 may transmit to the UE 415, DCI with an indication for the UL transmission to have a different open loop adjustment. The BS 405 may adjust the open loop adjustment parameter to indicate to the UE 415 to reduce the transmit power. In some aspects, the BS 405 transmits DCI indicating to the UE 415 to adjust the transmit power of the UE 415.
  • FIG. 5 illustrates a DCI configuration of a DCI 500 according to one or more aspects of the present disclosure.
  • PDCCH carries the DCI 500, which contains scheduling information 504 (e.g., for the UL and/or DL data channels) and other control information 506 for the UE 115 or a group of UEs.
  • the control information 506 includes a power control field 508 storing a value that indicates to the UE 115 whether to adjust the transmit power of the UE 115. If the power control field 508 stores a positive value, the UE 115 may determine to increase the transmit power of the UE 115. If the power control field 508 stores zero, the UE 115 may determine to maintain the transmit power of the UE 115 at the current level.
  • UE 115 may determine to reduce the transmit power of the UE 115.
  • the BS 202 may store a negative value in the power control field 508 and may transmit the DCI 500 including the power control field 508 to the UE 115.
  • the UE 115 receives the DCI 500 and determines that the power control field 508 stores a negative value.
  • the UE 115 reduces a transmit power of the UE 115.
  • the UE 115 may transmit UL data in accordance with the reduced transmit power.
  • the BS 202 may receive the UL data in accordance with the reduced transmit power of the UE 115.
  • the BS 202 may limit the scheduling of the UEs 115 during the LBT gaps to those UEs without an LBT blocking issue. In some instances, the BS 202 may determine whether a physical location of the UE 115 exceeds a distance threshold from the BS 204. If the physical location of the UE 115 exceeds the distance threshold from the BS 204, then the UE 115 may be physically far enough from the BS 204 such that UL transmissions by the UE 115 to the BS 202 will not adversely affect an LBT performed by the BS 204. The BS 202 may determine whether to transmit an UL scheduling grant for the UL data based on whether the physical location of the UE 115 exceeds the distance threshold from the BS 204.
  • the BS 202 may transmit to the UE 115, the UL scheduling grant in response to a determination that the physical location of the UE exceeds the distance threshold from the BS 204. Conversely, the BS 202 may refrain from transmitting to the UE 115 or determine to not transmit to the UE 115, the UL scheduling grant in response to a determination that the physical location of the UE does not exceed the distance threshold from the BS 204.
  • any of the FBE schemes discussed in the present disclosure may apply to transmission reception points (TRPs) , to wireless communication devices operating in different component carriers, or to more than two LBT bandwidths.
  • the BS 202 is a TRP
  • the BS 204 is a TRP.
  • the BS 202 and the BS 204 operate on different component carriers (e.g., component carrier A and component carrier B) .
  • the BS 202 may reduce the transmit power of UL communications (e.g., UL data) to increase the likelihood of an LBT pass for the LBT performed by the BS 204, the component carrier on which the BS 204 operates, or the LBT bandwidth 210 of the BS 204.
  • UL communications e.g., UL data
  • the reduction of the transmit power by the BS 202 is for the UL transmission scheduled at the same time as the LBT time of the other component carrier on which the BS 204 operates or the LBT bandwidth 210.
  • the reduction of the transmit power by a first TRP is for the UL transmission scheduled at the same time as the LBT time of the other component carrier on which the second TRP operates or the LBT bandwidth 210.
  • FIG. 6 is a block diagram of a BS 600 according to one or more aspects of the present disclosure.
  • the BS 600 may be a BS 105 as discussed in relation to FIG. 1, a BS 202 or BS 204 as discussed in relation to FIG. 2, FIG. 3, and/or FIG. 5, and/or a BS 405 as discussed in relation to FIG. 4.
  • the BS 600 may include a processor 602, a memory 604, an FFP module 608, a communication module 609, a transceiver 610 including a modem subsystem 612 and an RF unit 614, and one or more antennas 616. These elements may be in direct or indirect communication with each other, for example via one or more buses.
  • the processor 602 may include a central processing unit (CPU) , a digital signal processor (DSP) , an application specific integrated circuit (ASIC) , a controller, a field programmable gate array (FPGA) device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.
  • the processor 602 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • the memory 604 may include a cache memory (e.g., a cache memory of the processor 602) , random access memory (RAM) , magnetoresistive RAM (MRAM) , read-only memory (ROM) , programmable read-only memory (PROM) , erasable programmable read only memory (EPROM) , electrically erasable programmable read only memory (EEPROM) , flash memory, solid state memory device, hard disk drives, other forms of volatile and non-volatile memory, or a combination of different types of memory.
  • the memory 604 includes a non-transitory computer-readable medium.
  • the memory 604 may store, or have recorded thereon, instructions 606.
  • the FFP module 608 and/or the communication module 609 may be implemented via hardware, software, or combinations thereof.
  • the FFP module 608 and/or the communication module 609 may be implemented as a processor, circuit, and/or instructions 606 stored in the memory 604 and executed by the processor 602.
  • the FFP module 608 and/or the communication module 609 can be integrated within the modem subsystem 612.
  • the FFP module 608 and/or the communication module 609 can be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the modem subsystem 612.
  • the FFP module 608 and/or the communication module 609 may be used for various aspects of the present disclosure, for example, aspects of FIGs. 1-5 and 9.
  • the FFP module 608 may be configured to configure an LBT gap during a first FFP of the BS 600, where an end of the LBT gap corresponds to a starting point of a second FFP of a second BS different from the BS 600.
  • the communication module 609 may be configured to refrain from transmitting a first DL communication during the LBT gap.
  • the communication module 609 may be configured to transmit to a UE 115, a second DL communication during a portion of the first FFP outside the LBT gap.
  • the transceiver 610 may include the modem subsystem 612 and the RF unit 614.
  • the transceiver 610 can be configured to communicate bi-directionally with other devices, such as the UEs 115 and/or 415 and/or another core network element.
  • the modem subsystem 612 may be configured to modulate and/or encode data according to a MCS, e.g., a LDPC coding scheme, a turbo coding scheme, a convolutional coding scheme, a digital beamforming scheme, etc.
  • the RF unit 614 may be configured to process (e.g., perform analog to digital conversion or digital to analog conversion, etc.
  • modulated/encoded data e.g., grants, COT-SI, structure of an FFP, etc.
  • modulated/encoded data e.g., grants, COT-SI, structure of an FFP, etc.
  • the RF unit 614 may be further configured to perform analog beamforming in conjunction with the digital beamforming.
  • the modem subsystem 612 and/or the RF unit 614 may be separate devices that are coupled together at the BS 600 to enable the BS 600 to communicate with other devices.
  • the RF unit 614 may provide the modulated and/or processed data, e.g. data packets (or, more generally, data messages that may contain one or more data packets and other information) , to the antennas 616 for transmission to one or more other devices. This may include, for example, transmission of information to complete attachment to a network and communication with a camped UE 115 or 415 according to some aspects of the present disclosure.
  • the antennas 616 may further receive data messages transmitted from other devices and provide the received data messages for processing and/or demodulation at the transceiver 610.
  • the transceiver 610 may provide the demodulated and decoded data (e.g., structure of a FFP, DCI, UL data, etc. ) to the FFP module 608 and/or the communication module 609 for processing.
  • the antennas 616 may include multiple antennas of similar or different designs in order to sustain multiple transmission links.
  • the transceiver 610 is configured to receive an UL communication signal (e.g., UL data) and transmit a DL communication signal, by coordinating with the FFP module 608.
  • the BS 600 can include multiple transceivers 610 implementing different RATs (e.g., NR and LTE) .
  • the BS 600 can include a single transceiver 610 implementing multiple RATs (e.g., NR and LTE) .
  • the transceiver 610 can include various components, where different combinations of components can implement different RATs.
  • FIG. 7 is a block diagram of a TRP 700 according to one or more aspects of the present disclosure.
  • the TRP 700 may be similar to a BS 105 as discussed in relation to FIG. 1, a BS 202 or BS 204 as discussed in relation to FIG. 2, FIG. 3 and/or FIG. 5, and/or a BS 405 as discussed in relation to FIG. 4.
  • the TRP 700 may include a processor 702, a memory 704, an FFP module 708, a communication module 709, a transceiver 710 including a modem subsystem 712 and an RF unit 714, and one or more antennas 716. These elements may be in direct or indirect communication with each other, for example via one or more buses.
  • the processor 702 may have various features as a specific-type processor. For example, these may include a CPU, a DSP, an ASIC, a controller, a FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.
  • the processor 702 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • the memory 704 may include a cache memory (e.g., a cache memory of the processor 702) , RAM, MRAM, ROM, PROM, EPROM, EEPROM, flash memory, a solid state memory device, one or more hard disk drives, memristor-based arrays, other forms of volatile and non-volatile memory, or a combination of different types of memory.
  • the memory 704 may include a non-transitory computer-readable medium.
  • the memory 704 may store instructions 706.
  • the instructions 706 may include instructions that, when executed by the processor 702, cause the processor 702 to perform operations described herein, for example, aspects of FIGs. 1-5 and 9. Instructions 706 may also be referred to as code, which may be interpreted broadly to include any type of computer-readable statement (s) as discussed above with respect to FIG. 6.
  • the FFP module 708 and/or the communication module 709 may be implemented via hardware, software, or combinations thereof.
  • the FFP module 708 and/or the communication module 709 may be implemented as a processor, circuit, and/or instructions 706 stored in the memory 704 and executed by the processor 702.
  • the FFP module 708 and/or the communication module 709 can be integrated within the modem subsystem 712.
  • the FFP module 708 and/or the communication module 709 can be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the modem subsystem 712.
  • the FFP module 708 and/or the communication module 709 may be used for various aspects of the present disclosure, for example, aspects of FIGs. 1-5 and 9.
  • the FFP module 708 may be configured to configure an LBT gap during a first FFP of the TRP 700, where an end of the LBT gap corresponds to a starting point of a second FFP of a second TRP different from the TRP 700.
  • the communication module 709 may be configured to refrain from transmitting a first DL communication during the LBT gap.
  • the communication module 709 may be configured to transmit to a UE 115, a second DL communication during a portion of the first FFP outside the LBT gap.
  • the transceiver 710 may include the modem subsystem 712 and the RF unit 714.
  • the transceiver 710 can be configured to communicate bi-directionally with other devices, such as the UEs 115 and/or 415 and/or another core network element.
  • the modem subsystem 712 may be configured to modulate and/or encode data according to a MCS, e.g., a LDPC coding scheme, a turbo coding scheme, a convolutional coding scheme, a digital beamforming scheme, etc.
  • the RF unit 714 may be configured to process (e.g., perform analog to digital conversion or digital to analog conversion, etc.
  • modulated/encoded data e.g., grants, COT-SI, structure of an FFP, etc.
  • modulated/encoded data e.g., grants, COT-SI, structure of an FFP, etc.
  • the RF unit 714 may be further configured to perform analog beamforming in conjunction with the digital beamforming.
  • the modem subsystem 712 and/or the RF unit 714 may be separate devices that are coupled together at the TRP 700 to enable the TRP 700 to communicate with other devices.
  • the RF unit 714 may provide the modulated and/or processed data, e.g. data packets (or, more generally, data messages that may contain one or more data packets and other information) , to the antennas 716 for transmission to one or more other devices. This may include, for example, transmission of information to complete attachment to a network and communication with a camped UE 115 or 415 according to some aspects of the present disclosure.
  • the antennas 716 may further receive data messages transmitted from other devices and provide the received data messages for processing and/or demodulation at the transceiver 710.
  • the transceiver 710 may provide the demodulated and decoded data (e.g., structure of a FFP, DCI, UL data, etc. ) to the FFP module 708 and/or the communication module 709 for processing.
  • the antennas 716 may include multiple antennas of similar or different designs in order to sustain multiple transmission links.
  • the transceiver 710 is configured to receive an UL communication signal (e.g., UL data) and transmit a DL communication signal, by coordinating with the FFP module 708.
  • the TRP 700 can include multiple transceivers 710 implementing different RATs (e.g., NR and LTE) .
  • the TRP 700 can include a single transceiver 710 implementing multiple RATs (e.g., NR and LTE) .
  • the transceiver 710 can include various components, where different combinations of components can implement different RATs.
  • FIG. 8 is a block diagram of a UE 800 according to one or more aspects of the present disclosure.
  • the UE 800 may be a UE 115 discussed in relation to FIG. 1, FIG. 2, FIG. 3, and/or FIG. 5 and/or may be a UE 415 discussed in relation to FIG. 4.
  • the UE 800 may include a processor 802, a memory 804, an FFP module 808, a communication module 809, a transceiver 810 including a modem subsystem 812 and a radio frequency (RF) unit 814, and one or more antennas 816.
  • RF radio frequency
  • the processor 802 may have various features as a specific-type processor. For example, these may include a CPU, a DSP, an ASIC, a controller, a FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.
  • the processor 802 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • the memory 804 may include a cache memory (e.g., a cache memory of the processor 802) , RAM, MRAM, ROM, PROM, EPROM, EEPROM, flash memory, a solid state memory device, one or more hard disk drives, memristor-based arrays, other forms of volatile and non-volatile memory, or a combination of different types of memory.
  • the memory 804 may include a non-transitory computer-readable medium.
  • the memory 804 may store instructions 806.
  • the instructions 806 may include instructions that, when executed by the processor 802, cause the processor 802 to perform operations described herein, for example, aspects of FIGs. 1-. Instructions 806 may also be referred to as code, which may be interpreted broadly to include any type of computer-readable statement (s) as discussed above with respect to FIG. 6.
  • the FFP module 808 and/or the communication module 809 may be implemented via hardware, software, or combinations thereof.
  • the FFP module 808 and/or the communication module 809 may be implemented as a processor, circuit, and/or instructions 806 stored in the memory 804 and executed by the processor 802.
  • the FFP module 808 and/or the communication module 809 can be integrated within the modem subsystem 812.
  • the FFP module 808 and/or the communication module 809 can be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the modem subsystem 812.
  • the FFP module 808 and/or the communication module 809 may be used for various aspects of the present disclosure, for example, aspects of FIGs. 1-5.
  • the FFP module 808 may be configured to receive the structure of an FFP.
  • the communication module 809 may be configured to receive from a BS or a TRP, a DL communication during a portion of a FFP outside the LBT gap.
  • the DL communication indicates an UL scheduling grant for an UL transmission.
  • the UE 600 may receive the DL communication and transmit an UL communication (e.g., UCI and/or UL data) based on the UL scheduling grant indicated in the DL communication.
  • the BS or the TRP that transmitted the DL communication may receive the UL communication during the LBT gap.
  • the FFP module 808 may be configured to receive from a BS or TRP, an UL scheduling grant for transmitting an UL communication during an UL period for a first FFP in a first LBT bandwidth, the UL period at least partially overlapping with an idle period of a second FFP in a second LBT bandwidth different from the first LBT bandwidth.
  • the communication module 809 may be configured to transmit to the BS or the TRP, the UL communication during the UL period.
  • the first FFP may belong to the BS 202
  • the second FFP may belong to the BS 204.
  • the transceiver 810 may include the modem subsystem 812 and the RF unit 814.
  • the transceiver 810 can be configured to communicate bi-directionally with other devices, such as the BS 105, BS 202, BS 204, BS 405, BS 600, and/or TRP 700.
  • the modem subsystem 812 may be configured to modulate and/or encode the data from the memory 804 and/or the FFP module 808 according to a MCS, e.g., a LDPC coding scheme, a turbo coding scheme, a convolutional coding scheme, a digital beamforming scheme, etc.
  • the RF unit 814 may be configured to process (e.g., perform analog to digital conversion or digital to analog conversion, etc.
  • the RF unit 814 may be further configured to perform analog beamforming in conjunction with the digital beamforming. Although shown as integrated together in transceiver 810, the modem subsystem 812 and the RF unit 814 may be separate devices that are coupled together at the UE 800 to enable the UE 800 to communicate with other devices.

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

Abstract

L'invention se rapporte aux communications sans fil dans un système, et concerne des systèmes et des procédés de communications sans fil. Un premier dispositif de communication sans fil peut configurer un intervalle d'écoute avant de parler (LBT) pendant une première période de trame fixe (FFP) du premier dispositif de communication sans fil. Une extrémité de l'intervalle LBT peut correspondre à un point de départ d'une seconde FFP d'un second dispositif de communication sans fil. Le premier dispositif de communication sans fil peut s'abstenir de transmettre une première communication de liaison descendante (DL) pendant l'intervalle LBT. Le premier dispositif de communication sans fil peut transmettre à un équipement utilisateur (UE) une seconde communication de DL pendant une partie de la première FFP à l'extérieur de l'intervalle LBT.
PCT/CN2020/073717 2020-01-22 2020-01-22 Périodes de trames fixes mal alignées (ffps) de multiples dispositifs de communication sans fil Ceased WO2021146983A1 (fr)

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