WO2020140225A1 - Signalisation de référence pour gestion d'interférences voisines - Google Patents

Signalisation de référence pour gestion d'interférences voisines Download PDF

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Publication number
WO2020140225A1
WO2020140225A1 PCT/CN2019/070192 CN2019070192W WO2020140225A1 WO 2020140225 A1 WO2020140225 A1 WO 2020140225A1 CN 2019070192 W CN2019070192 W CN 2019070192W WO 2020140225 A1 WO2020140225 A1 WO 2020140225A1
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Prior art keywords
reference signal
base station
aspects
modulation symbol
transmitted
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PCT/CN2019/070192
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English (en)
Inventor
Huilin Xu
Tingfang Ji
Yiqing Cao
Yuwei REN
Alexandros MANOLAKOS
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Qualcomm Incorporated
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Priority to PCT/CN2019/070192 priority Critical patent/WO2020140225A1/fr
Priority to EP19907738.9A priority patent/EP3906734A4/fr
Priority to PCT/CN2019/130365 priority patent/WO2020140888A1/fr
Priority to CN201980086898.XA priority patent/CN113228758A/zh
Publication of WO2020140225A1 publication Critical patent/WO2020140225A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
    • H04B7/2656—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for structure of frame, burst
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference
    • H04J11/0056—Inter-base station aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03821—Inter-carrier interference cancellation [ICI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/26025—Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0026—Division using four or more dimensions
    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation
    • 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
    • H04L5/0091—Signaling for the administration of the divided path
    • 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
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0073—Allocation arrangements that take into account other cell interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • aspects of the present disclosure generally relate to wireless communication, and to techniques and apparatuses for reference signaling for neighbor interference management.
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts.
  • Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc. ) .
  • multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, orthogonal frequency-division multiple access (OFDMA) systems, single-carrier frequency-division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE) .
  • LTE/LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP) .
  • UMTS Universal Mobile Telecommunications System
  • a wireless communication network may include a number of base stations (BSs) that can support communication for a number of user equipment (UEs) .
  • a user equipment (UE) may communicate with a base station (BS) via the downlink and uplink.
  • the downlink (or forward link) refers to the communication link from the BS to the UE
  • the uplink (or reverse link) refers to the communication link from the UE to the BS.
  • a BS may be referred to as a Node B, a gNB, an access point (AP) , a radio head, a transmit receive point (TRP) , a new radio (NR) BS, a 5G Node B, and/or the like.
  • New radio which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP) .
  • NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL) , using CP-OFDM and/or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM) ) on the uplink (UL) , as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.
  • OFDM orthogonal frequency division multiplexing
  • CP-OFDM with a cyclic prefix
  • SC-FDM e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)
  • DFT-s-OFDM discrete Fourier transform spread OFDM
  • MIMO multiple-input multiple-output
  • a method of wireless communication may include communicating a reference signal for interference management between the first base station and a second base station, wherein respective time division duplexing (TDD) configurations of the first base station and the second base station conflict with each other; and performing an interference management operation based at least in part on the reference signal.
  • TDD time division duplexing
  • a first base station for wireless communication may include memory and one or more processors operatively coupled to the memory.
  • the memory and the one or more processors may be configured to communicate a reference signal for interference management between the first base station and a second base station, wherein respective TDD configurations of the first base station and the second base station conflict with each other; and perform an interference management operation based at least in part on the reference signal.
  • a non-transitory computer-readable medium may store one or more instructions for wireless communication.
  • the one or more instructions when executed by one or more processors of a first base station, may cause the one or more processors to communicate a reference signal for interference management between the first base station and a second base station, wherein respective TDD configurations of the first base station and the second base station conflict with each other; and perform an interference management operation based at least in part on the reference signal.
  • an apparatus for wireless communication may include means for communicating a reference signal for interference management between the apparatus and a base station, wherein respective TDD configurations of the apparatus and the base station conflict with each other; and means for performing an interference management operation based at least in part on the reference signal.
  • aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communication device, and processing system as substantially described herein with reference to and as illustrated by the accompanying specification and drawings.
  • Fig. 1 is a block diagram conceptually illustrating an example of a wireless communication network, in accordance with various aspects of the present disclosure.
  • Fig. 2 is a block diagram conceptually illustrating an example of a base station in communication with a user equipment (UE) in a wireless communication network, in accordance with various aspects of the present disclosure.
  • UE user equipment
  • Fig. 3 is a diagram illustrating an example of neighbor base station cross-link interference management, in accordance with various aspects of the present disclosure.
  • Fig. 4 is a diagram illustrating an example of a timing advance based design for a reference signal for neighbor interference management, in accordance with various aspects of the present disclosure.
  • Fig. 5 is a diagram illustrating an example of a cyclic prefix based design for a reference signal for neighbor interference management, in accordance with various aspects of the present disclosure.
  • Fig. 6 is a diagram illustrating an example of a symbol muting based design for a reference signal for neighbor interference management, in accordance with various aspects of the present disclosure.
  • Fig. 7 is a diagram illustrating another example of a symbol muting based design for a reference signal for neighbor interference management, in accordance with various aspects of the present disclosure.
  • Fig. 8 is a diagram illustrating examples of frequency-domain and time-domain configurations for a reference signal for neighbor interference management, in accordance with various aspects of the present disclosure.
  • Fig. 9 is a diagram illustrating an example process performed, for example, by a base station, in accordance with various aspects of the present disclosure.
  • Cross-link interference may occur between two or more base stations.
  • CLI may occur when a first base station’s downlink transmission is received by a second base station during an uplink slot of the second base station.
  • CLI may occur between two base stations that are time-synchronized with each other and that are remote from each other. This scenario may be referred to as remote interference.
  • Remote interference may occur due to atmospheric ducting under certain weather conditions. Remote interference may occur between base stations that are separated by hundreds of kilometers, or that are each macro cells. Remote interference may occur due to the propagation delay of the first base station’s downlink transmission being greater than a guard period between the downlink and the uplink.
  • CLI may occur between neighbor base stations or small cells.
  • the neighbor base stations may be associated with conflicting time division duplexing (TDD) uplink/downlink (UL-DL) configurations.
  • TDD time division duplexing
  • UL-DL uplink/downlink
  • a network controller may determine that a performance improvement associated with the conflicting TDD UL-DL configurations outweighs the interference that will be caused by the conflicting configurations, and may therefore configure the neighbor base stations to use the conflicting configurations.
  • Remote interference management may be performed using a reference signal (RS) , referred to herein as a RIM RS.
  • a victim base station may transmit the RIM RS when interference is detected so that an aggressor base station is alerted to the interference, or the aggressor base station may transmit the RIM RS so that the victim base station can identify the aggressor base station.
  • the RIM RS may be designed or generated based on particular constraints. For example, the RIM RS may be transmitted in a fixed location (e.g., without being adaptive to interference propagation delay) since the propagation delay may not be easily ascertained when the base stations are separated by a large distance.
  • the RIM RS may use a long cyclic prefix (CP) (e.g., twice the length of a typical CP) and a two OFDM symbol repetition scheme.
  • An OFDM symbol is referred to as a modulation symbol in some cases. This may allow a receiving base station to decode the RIM RS even when the RIM RS is associated with significant timing error.
  • the RIM RS may use all resource elements (REs) of a resource block (RB) (e.g., without using a comb) , so that the orthogonality of the OFDM waveform is preserved.
  • RB resource block
  • a network e.g., a network controller, a base station, and/or the like
  • the propagation delay between two base stations can be determined by the network (e.g., using geolocation techniques, ranging techniques, and/or the like) . Therefore, if the RIM RS is used for neighbor base station interference management, bandwidth and radio resources may be inefficiently utilized to transmit an overly constrained RS.
  • the RS may use a timing advance based design, wherein a timing advance is applied to the reference signal so that reference signals are time-aligned at a receiver base station.
  • a regular CP may be used when numerologies of the base stations match each other.
  • the RS may use a CP-based design, wherein a CP that is longer than a length of an OFDM symbol at a detector base station is used for the RS.
  • the CP may be at least as long as a largest BS-to-BS propagation delay among neighbor base stations.
  • the detector base station can receive the RS without inter-symbol interference using a regular uplink reception timing.
  • the RS may use a symbol muting and/or guard band approach, wherein certain OFDM symbols are muted and/or a guard band is used to prevent inter-carrier interference.
  • Inter-carrier interference may refer to interference due to a lack of orthogonality in an OFDM waveform, and may occur due to carrier frequency offsets, from Doppler spread due to channel time variation, and/or the like.
  • the RS for neighbor interference management may provide more efficient resource utilization than the RIM RS.
  • the symbol muting and/or guard band approach there may be no need to use a full RB (e.g., with no comb) to prevent ICI.
  • the timing advance based design the reliance on the long CP and multi-symbol repetition of the RIM RS may be avoided.
  • inter-symbol interference may be avoided without the use of multiple repetitions of the RIM RS or mitigation of timing error.
  • frequency resource utilization e.g., by using a comb instead of a full RB
  • time resource utilization e.g., by transmitting a single OFDM symbol and/or a regular CP
  • frequency resource utilization e.g., by using a comb instead of a full RB
  • time resource utilization e.g., by transmitting a single OFDM symbol and/or a regular CP
  • aspects may be described herein using terminology commonly associated with 3G and/or 4G wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems, such as 5G and later, including NR technologies.
  • Fig. 1 is a diagram illustrating a network 100 in which aspects of the present disclosure may be practiced.
  • the network 100 may be an LTE network or some other wireless network, such as a 5G or NR network.
  • Wireless network 100 may include a number of BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities.
  • a BS is an entity that communicates with user equipment (UEs) and may also be referred to as a base station, a NR BS, a Node B, a gNB, a 5G node B (NB) , an access point, a transmit receive point (TRP) , and/or the like.
  • Each BS may provide communication coverage for a particular geographic area.
  • the term “cell” can refer to a coverage area of a BS and/or a BS subsystem serving this coverage area, depending on the context in which the term is used.
  • a BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or another type of cell.
  • a macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription.
  • a pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription.
  • a femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs having association with the femto cell (e.g., UEs in a closed subscriber group (CSG) ) .
  • a BS for a macro cell may be referred to as a macro BS.
  • a BS for a pico cell may be referred to as a pico BS.
  • a BS for a femto cell may be referred to as a femto BS or a home BS.
  • a BS 110a may be a macro BS for a macro cell 102a
  • a BS 110b may be a pico BS for a pico cell 102b
  • a BS 110c may be a femto BS for a femto cell 102c.
  • a BS may support one or multiple (e.g., three) cells.
  • eNB base station
  • NR BS NR BS
  • gNB gNode B
  • AP AP
  • node B node B
  • 5G NB 5G NB
  • cell may be used interchangeably herein.
  • a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile BS.
  • the BSs may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in the access network 100 through various types of backhaul interfaces such as a direct physical connection, a virtual network, and/or the like using any suitable transport network.
  • Wireless network 100 may also include relay stations.
  • a relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send a transmission of the data to a downstream station (e.g., a UE or a BS) .
  • a relay station may also be a UE that can relay transmissions for other UEs.
  • a relay station 110d may communicate with macro BS 110a and a UE 120d in order to facilitate communication between BS 110a and UE 120d.
  • a relay station may also be referred to as a relay BS, a relay base station, a relay, etc.
  • Wireless network 100 may be a heterogeneous network that includes BSs of different types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc. These different types of BSs may have different transmit power levels, different coverage areas, and different impact on interference in wireless network 100.
  • macro BSs may have a high transmit power level (e.g., 5 to 40 Watts) whereas pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 Watts) .
  • a network controller 130 may couple to a set of BSs and may provide coordination and control for these BSs.
  • Network controller 130 may communicate with the BSs via a backhaul.
  • the BSs may also communicate with one another, e.g., directly or indirectly via a wireless or wireline backhaul.
  • network controller 130 may coordinate time division duplexing (TDD) uplink-downlink (UL-DL) configurations of base stations.
  • network controller 130 may manage interference between base stations.
  • UEs 120 may be dispersed throughout wireless network 100, and each UE may be stationary or mobile.
  • a UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, etc.
  • a UE may be a cellular phone (e.g., a smart phone) , a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, medical device or equipment, biometric sensors/devices, wearable devices (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (e.g., smart ring, smart bracelet)) , an entertainment device (e.g., a music or video device, or a satellite radio) , a vehicular component or sensor, smart meters/sensors, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium.
  • PDA personal digital assistant
  • WLL wireless local loop
  • MTC and eMTC UEs include, for example, robots, drones, remote devices, such as sensors, meters, monitors, location tags, etc., that may communicate with a base station, another device (e.g., remote device) , or some other entity.
  • a wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link.
  • Some UEs may be considered Internet-of-Things (IoT) devices, and/or may be implemented as may be implemented as NB-IoT (narrowband internet of things) devices. Some UEs may be considered a Customer Premises Equipment (CPE) .
  • UE 120 may be included inside a housing that houses components of UE 120, such as processor components, memory components, and/or the like.
  • any number of wireless networks may be deployed in a given geographic area.
  • Each wireless network may support a particular RAT and may operate on one or more frequencies.
  • a RAT may also be referred to as a radio technology, an air interface, etc.
  • a frequency may also be referred to as a carrier, a frequency channel, etc.
  • Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
  • NR or 5G RAT networks may be deployed.
  • a scheduling entity e.g., a base station
  • the scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, subordinate entities utilize resources allocated by the scheduling entity.
  • Base stations are not the only entities that may function as a scheduling entity. That is, in some examples, a UE may function as a scheduling entity, scheduling resources for one or more subordinate entities (e.g., one or more other UEs) . In this example, the UE is functioning as a scheduling entity, and other UEs utilize resources scheduled by the UE for wireless communication.
  • a UE may function as a scheduling entity in a peer-to-peer (P2P) network, and/or in a mesh network. In a mesh network example, UEs may optionally communicate directly with one another in addition to communicating with the scheduling entity.
  • P2P peer-to-peer
  • mesh network UEs may optionally communicate directly with one another in addition to communicating with the scheduling entity.
  • a scheduling entity and one or more subordinate entities may communicate utilizing the scheduled resources.
  • two or more UEs 120 may communicate directly using one or more sidelink channels (e.g., without using a base station 110 as an intermediary to communicate with one another) .
  • the UEs 120 may communicate using peer-to-peer (P2P) communications, device-to-device (D2D) communications, a vehicle-to-everything (V2X) protocol (e.g., which may include a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, and/or the like) , a mesh network, and/or the like.
  • V2X vehicle-to-everything
  • the UE 120 may perform scheduling operations, resource selection operations, and/or other operations described elsewhere herein as being performed by the base station 110.
  • Fig. 1 is provided merely as an example. Other examples may differ from what was described with regard to Fig. 1.
  • Fig. 2 shows a block diagram of a design 200 of base station 110 and UE 120, which may be one of the base stations and one of the UEs in Fig. 1.
  • Base station 110 may be equipped with T antennas 234a through 234t
  • UE 120 may be equipped with R antennas 252a through 252r, where in general T ⁇ 1 and R ⁇ 1.
  • a transmit processor 220 may receive data from a data source 212 for one or more UEs, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQIs) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS (s) selected for the UE, and provide data symbols for all UEs. Transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI) , etc. ) and control information (e.g., CQI requests, grants, upper layer signaling, etc. ) and provide overhead symbols and control symbols.
  • MCS modulation and coding schemes
  • Transmit processor 220 may also generate reference symbols for reference signals (e.g., the cell-specific reference signal (CRS) ) and synchronization signals (e.g., the primary synchronization signal (PSS) and secondary synchronization signal (SSS) ) .
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream.
  • TX transmit
  • MIMO multiple-input multiple-output
  • Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream.
  • Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively.
  • the synchronization signals can be generated with location encoding to convey additional information.
  • antennas 252a through 252r may receive the downlink signals from base station 110 and/or other base stations and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively.
  • Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a received signal to obtain input samples.
  • Each demodulator 254 may further process the input samples (e.g., for OFDM, etc. ) to obtain received symbols.
  • a MIMO detector 256 may obtain received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller/processor 280.
  • a channel processor may determine reference signal received power (RSRP) , received signal strength indicator (RSSI) , reference signal received quality (RSRQ) , channel quality indicator (CQI) , etc.
  • RSRP reference signal received power
  • RSSI received signal strength indicator
  • RSRQ reference signal received quality
  • CQI channel quality indicator
  • one or more components of UE 120 may be included in a housing.
  • a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports comprising RSRP, RSSI, RSRQ, CQI, etc. ) from controller/processor 280. Transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc. ) , and transmitted to base station 110.
  • modulators 254a through 254r e.g., for DFT-s-OFDM, CP-OFDM, etc.
  • the uplink signals from UE 120 and other UEs may be received by antennas 234, processed by demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by UE 120.
  • Receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to controller/processor 240.
  • Base station 110 may include communication unit 244 and communicate to network controller 130 via communication unit 244.
  • Network controller 130 may include communication unit 294, controller/processor 290, and memory 292.
  • Controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform one or more techniques associated with reference signaling for neighbor interference management, as described in more detail elsewhere herein.
  • controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform or direct operations of, for example, process 900 of Fig. 9 and/or other processes as described herein.
  • Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively.
  • a scheduler 246 may schedule UEs for data transmission on the downlink and/or uplink.
  • the stored program codes when executed by processor 280 and/or other processors and modules at UE 120, may cause the UE 120 to perform operations described with respect to process 900 of Fig. 9 and/or other processes as described herein.
  • the stored program codes when executed by processor 240 and/or other processors and modules at base station 110, may cause the base station 110 to perform operations described with respect to process 900 of Fig. 9 and/or other processes as described herein.
  • a scheduler 246 may schedule UEs for data transmission on the downlink and/or uplink.
  • base station 110 may include means for communicating a reference signal for interference management between base station 110 and a second base station, wherein respective TDD configurations of base station 110 and the second base station conflict with each other; means for performing an interference management operation based at least in part on the reference signal; means for dropping data of a modulation symbol; means for performing rate matching based at least in part on the reference signal; and/or the like.
  • such means may include one or more components of base station 110 described in connection with Fig. 2.
  • While blocks in Fig. 2 are illustrated as distinct components, the functions described above with respect to the blocks may be implemented in a single hardware, software, or combination component or in various combinations of components.
  • the functions described with respect to the transmit processor 264, the receive processor 258, and/or the TX MIMO processor 266 may be performed by or under the control of processor 280.
  • Fig. 2 is provided merely as an example. Other examples may differ from what was described with regard to Fig. 2.
  • Fig. 3 is a diagram illustrating an example 300 of neighbor base station cross-link interference, in accordance with various aspects of the present disclosure.
  • example 300 includes an aggressor base station (e.g., BS 110) and a victim base station (e.g., BS 110) .
  • the aggressor base station and the victim base station may be small cells.
  • the aggressor base station and the victim base station may be neighbors of each other (e.g., adjacent to each other, within a threshold distance of each other, etc. ) .
  • the aggressor base station and the victim base station may be part of a group of base stations or small cells, such as a group managed by a same network controller and/or the like.
  • the aggressor base station may be associated with a first TDD UL-DL configuration (shown as Config. ) .
  • the victim base station may be associated with a second TDD UL-DL configuration.
  • the first TDD UL-DL configuration and the second TDD UL-DL configuration may not be time-aligned with each other. This may cause cross-link interference at the victim base station from a downlink transmission of the aggressor base station during an uplink slot of the victim base station. This cross-link interference is shown by reference number 330.
  • the aggressor base station and/or the victim base station may perform an interference management operation to mitigate the cross-link interference.
  • the interference management operation may include an inter-cell interference coordination operation, such as a power adjustment, a mutually exclusive resource block allocation, a symbol shift, an almost blank subframe, a multimedia broadcast single frequency network operation, and/or the like.
  • the victim base station may identify the RS and may measure the strength of the RS. Based at least in part on the measurement, the victim base station may suggest that the network adjust the TDD UL-DL configuration of the aggressor base station to reduce the interference power.
  • the aggressor base station may use a more aggressive TDD UL-DL configuration that impacts more symbols of the victim base station.
  • the aggressor base station and/or the victim base station may perform the interference management operation based at least in part on a reference signal for neighbor interference management.
  • the reference signal for neighbor interference management is described in more detail in connection with Figs. 4-8.
  • the aggressor base station may transmit the reference signal for neighbor interference management.
  • the aggressor base station may transmit the reference signal for neighbor interference management so that victim base stations and/or a network controller can identify the aggressor base station.
  • the victim base station may transmit the reference signal for neighbor interference management.
  • the victim base station may transmit the reference signal for neighbor interference management to indicate that the victim base station is the victim of interference, and/or to permit the aggressor base station to determine that the aggressor base station is the source of the interference.
  • both the aggressor base station and the victim base station may transmit the reference signal for neighbor interference management.
  • Fig. 3 is provided as an example. Other examples may differ from what is described with respect to Fig. 3.
  • Fig. 4 is a diagram illustrating an example 400 of a timing advance based design for a reference signal for neighbor interference management, in accordance with various aspects of the present disclosure.
  • example 400 includes two transmitter base stations (BS #1 and BS #3) and a receiver base station (BS #2) .
  • a transmitter base station is a base station that is to transmit a reference signal.
  • a receiver base station is a base station that is to receive a reference signal.
  • a transmitter base station may be an aggressor base station or a victim base station.
  • a receiver base station may be an aggressor base station or a victim base station.
  • TDD UL-DL configurations of each base station are shown with “U” denoting an uplink OFDM symbol, “D” denoting a downlink OFDM symbol, and “X” denoting a flexible OFDM symbol.
  • Cyclic prefixes are shown by rectangles preceding each OFDM symbol.
  • An example of a cyclic prefix is shown by reference number 410.
  • the timing advance based design may use a regular cyclic prefix.
  • the timing advance based design may use a regular cyclic prefix according to a numerology (e.g., subcarrier spacing, etc. ) of the reference signal.
  • a timing advance may be applied to the reference signal for transmission.
  • the respective timing advances of the transmitter base stations are shown by reference numbers 420 and 430.
  • the timing advance may be applied so that the reference signal is time-aligned with an uplink signal at the receiver base station.
  • the timing advance of BS #1 may be determined based at least in part on the propagation delay indicated by reference number 440. This propagation delay may be determined by BS #1 or a network controller associated with BS #1 and/or BS #2.
  • the reference signals may arrive at BS #2 in time alignment with an uplink OFDM symbol of BS #2.
  • demodulation complexity at BS #2 is reduced in comparison to demodulating a reference signal over two or more symbols, and a cyclic prefix length and reference signal length of the reference signal may be reduced in comparison to approaches using a larger cyclic prefix or multiple transmissions of the reference signal.
  • the receiver base station may perform rate matching of the reference signal.
  • the receiver base station may perform resource-element-level rate matching of the reference signal, thereby conserving resources of the transmitter base station that would otherwise be used to perform rate matching.
  • Fig. 4 is provided as an example. Other examples may differ from what is described with respect to Fig. 4.
  • Fig. 5 is a diagram illustrating an example 500 of a cyclic prefix based design for a reference signal for neighbor interference management, in accordance with various aspects of the present disclosure.
  • a base station may transmit a reference signal using a cyclic prefix length that may (or may not) be longer than a regular cyclic prefix of a OFDM symbol.
  • the cyclic prefix is shown by reference number 510.
  • a length of the cyclic prefix may be based at least in part on a propagation delay between the transmitter base station (s) and the receiver base station (shown, for example, by reference number 520) .
  • the length, in time, of the cyclic prefix may be at least as long as a longest base station to base station propagation delay among BS #1, BS #2, and BS #3.
  • the reference signals may use the regular cyclic prefix length.
  • the reference signals may use the longer cyclic prefix.
  • the BS #2 may be capable of demodulating a reference signal without experiencing inter-symbol interference due to the reference signal fully overlapping one OFDM symbol of the BS #2.
  • the longer cyclic prefix may mitigate the propagation delay associated with the reference signal since front edge t of the longer cyclic prefix that is included in one OFDM symbol may still fall before the cyclic prefix of the symbol of the BS #2 .
  • efficiency and reliability of receiving the reference signal is improved without performing multiple transmissions of the reference signal or extending the reference signal over multiple OFDM symbols.
  • the transmitter base station may perform rate matching of the reference signal. For example, in the cyclic prefix based design and/or in one or more other designs described herein, the transmitter base station may perform resource-element-level rate matching of the reference signal, thereby conserving resources of the receiver base station that would otherwise be used to perform rate matching.
  • Fig. 5 is provided as an example. Other examples may differ from what is described with respect to Fig. 5.
  • Fig. 6 is a diagram illustrating an example 600 of a symbol muting based design for a reference signal for neighbor interference management, in accordance with various aspects of the present disclosure.
  • the symbol muting based design may mitigate inter-cell interference between the reference signal and a data or control communication of a receiver base station or a transmitter base station by muting OFDM symbol (s) of the data or control communication that partially overlap a reference signal. This may preserve the orthogonality of the waveform, thus eliminating inter-carrier interference.
  • Three cases of reference signal design using the symbol muting based design are shown in Fig. 6: a first case shown by reference numbers 610 and 620; a second case shown by reference numbers 630 and 640, and a third case shown by reference numbers 650 and 660.
  • the operations described in connection with Fig. 6 may be performed by a transmitter base station or a receiver base station.
  • the reference signal may partially overlap two OFDM symbols.
  • the reference signal and the two OFDM symbols may have the same numerology (e.g., the same subcarrier spacing) and may not be time-aligned.
  • the two OFDM symbols may be muted. “Muting” is referred to in some cases as “dropping. ”
  • dropping is referred to in some cases as “dropping. ”
  • the orthogonality of the waveform is preserved, thereby reducing inter-carrier interference.
  • the reference signal may collide with a single OFDM symbol.
  • the reference signal may have a larger numerology (e.g., a wider subcarrier spacing) than the single OFDM symbol, and may therefore be shorter in time than the single OFDM symbol in time.
  • the single OFDM symbol may be muted.
  • the orthogonality of the waveform is preserved, thereby reducing inter-carrier interference.
  • the reference signal may collide with multiple OFDM symbols.
  • the reference signal may have a smaller numerology (e.g., a narrower subcarrier spacing) than the multiple OFDM symbols, and may therefore be longer than the multiple OFDM symbols.
  • the reference signal collides with three OFDM symbols.
  • the reference signal may collide with any number of OFDM symbols based at least in part on the respective numerologies of the reference signal and the OFDM symbols.
  • the multiple OFDM symbols may be muted. Thus, the orthogonality of the waveform is preserved, thereby reducing inter-carrier interference.
  • a reference signal may be transmitted with a guard band in between the reference signal and a data or control transmission.
  • the guard band may be a frequency-domain guard band.
  • the guard band may provide improved resilience against frequency drift or frequency offset on the part of the transmitter base station. For example, if a frequency of a reference signal drifts due to Doppler effect, atmospheric conditions, and/or the like, the reference signal may provide inter-carrier interference with carriers that are close to the reference signal in frequency.
  • the guard band e.g., in addition to or as an alternative to the other aspects described herein
  • inter-carrier interference between the reference signal and other carriers may be reduced.
  • Fig. 6 is provided as an example. Other examples may differ from what is described with respect to Fig. 6.
  • Fig. 7 is a diagram illustrating an example 700 of a symbol muting based design for a reference signal for neighbor interference management, in accordance with various aspects of the present disclosure.
  • Example 700 is an example wherein a reference signal that fully overlaps (e.g., is coextensive with) a OFDM symbol is frequency division multiplexed with the OFDM symbol without muting the OFDM symbol. Thus, resource efficiency is improved relative to muting the OFDM symbol.
  • the operations described in connection with Fig. 7 may be performed by a transmitter base station or a receiver base station.
  • a reference signal may fully overlap a OFDM symbol.
  • the reference signal may have a same numerology as the OFDM symbol and may be aligned with the OFDM symbol in time.
  • the reference signal and the OFDM symbol may have a same length cyclic prefix.
  • the reference signal and the OFDM symbol may be frequency division multiplexed (e.g., without muting or dropping the OFDM symbol) .
  • the orthogonality of the waveform may be preserved without dropping the data or control transmission.
  • a reference signal may partially overlap a first OFDM symbol, and may fully overlap a second OFDM symbol.
  • the reference signal fully overlaps the second OFDM symbol (e.g., the later OFDM symbol) since the reference signal is aligned in time with the second OFDM symbol and has the same numerology as the second OFDM symbol.
  • the reference signal partially overlaps the first OFDM symbol (e.g., the earlier OFDM symbol) due to the longer cyclic prefix of the reference signal overlapping the first OFDM symbol.
  • the reference signal and the second OFDM symbol may be frequency division multiplexed, thereby improving bandwidth efficiency.
  • the first OFDM symbol may be dropped, thereby reducing inter-carrier interference between the first OFDM symbol and the reference signal and improving reliability of the reference signal.
  • Fig. 7 is provided as an example. Other examples may differ from what is described with respect to Fig. 7.
  • Fig. 8 is a diagram illustrating examples 800 of frequency-domain and time-domain configurations for a reference signal for neighbor interference management, in accordance with various aspects of the present disclosure.
  • Fig. 8 shows frequency domain configurations (shown as “ (a) Frequency domain” for each example) and time domain configurations (shown as “ (b) Time domain” for each example) .
  • each block may represent a subcarrier or a resource element.
  • a set of gray triangles may represent an OFDM symbol
  • a white trapezoid may represent the cyclic prefix for the OFDM symbol.
  • the triangular or trapezoidal shape of the OFDM symbols and cyclic prefixes is not intended to represent the waveform or other characteristics of the OFDM symbols or the cyclic prefixes.
  • a frequency domain comb may be used for the reference signal.
  • the frequency domain comb uses every fourth resource element or subcarrier (e.g., a comb offset of 4) , represented by the four shaded rectangles of the frequency domain configuration. Therefore, the OFDM symbol includes four repetitions of the reference signal, represented by the four triangles of the time domain configuration.
  • the frequency domain comb may conserve bandwidth resources while providing frequency diversity.
  • a comb offset may be used to convey information associated with the reference signal, such as a transmitter identifier, additional control information, and/or the like.
  • no frequency domain comb may be used for the reference signal, so all resource elements or subcarriers may be used for the reference signal.
  • the OFDM symbol is represented by a single triangle. This may reduce inter-carrier interference in comparison to using a frequency domain comb.
  • no frequency domain comb may be used for the reference signal, so all resource elements or subcarriers may be used for the reference signal.
  • two or more OFDM symbols may be used for the reference signal. In this case, each OFDM symbol may have a respective cyclic prefix. Thus, reliability of the reference signal and decoding complexity may be reduced in comparison to using a single OFDM signal with a regular cyclic prefix.
  • a frequency domain orthogonal cover code (OCC) and a time domain OCC may be used for the reference signal.
  • OCC frequency domain orthogonal cover code
  • a time domain OCC may be used for the reference signal.
  • an OCC may be used to convey information associated with the reference signal, such as a transmitter identifier, additional control information, and/or the like.
  • the configuration of the reference signal may be based at least in part on configuration information.
  • the configuration information may be provided by a network (e.g., network controller 130, base station 110, etc. ) .
  • the configuration information may indicate a starting symbol, a timing advance (e.g., for at least the timing advance based design) , a cyclic prefix length (e.g., for at least the cyclic prefix based design) , and/or the like.
  • the configuration information may indicate whether the reference signal is to use a single OFDM symbol or multiple OFDM symbols (e.g., with different sequences for each OFDM symbol) .
  • the configuration information may indicate whether a frequency domain comb is to be used and/or a comb offset (e.g., a resource element level comb offset) for the frequency domain comb.
  • the configuration information may indicate whether an OCC is to be used and/or may indicate a frequency domain OCC or a time domain OCC. In some aspects, the configuration information may indicate whether partially overlapping OFDM symbols are to be muted and/or a guard band to be used for the reference signal. In some aspects, the configuration information may indicate a rate matching configuration (e.g., whether rate matching is to be performed at the transmitter base station or the receiver base station) .
  • the configuration information may include information identifying a scrambling identifier, a transmission periodicity, a slot in which the reference signal is to be transmitted, a transmission sub-band for the reference signal, a transmission mini-band for the reference signal, an RB-symbol level rate matching configuration for the transmitter base station and or the receiver base station, a backhaul link for information exchange between the base stations, an interface for message exchange between the base stations and the network controller, and/or the like.
  • the configuration information may include other information relevant to configuring the operations described herein.
  • Fig. 8 is provided as an example. Other examples may differ from what is described with respect to Fig. 8.
  • Fig. 9 is a diagram illustrating an example process 900 performed, for example, by a base station, in accordance with various aspects of the present disclosure.
  • Example process 900 is an example where a first base station (e.g., BS 110) performs reference signaling for neighbor interference management.
  • a first base station e.g., BS 110
  • process 900 may include communicating a reference signal for interference management between a first base station and a second base station, wherein respective TDD configurations of the first base station and the second base station conflict with each other (block 910) .
  • the first base station e.g., using antenna 234, MOD/DEMOD 232, MIMO detector 236, receive processor 238, controller/processor 240, transmit processor 220, TX MIMO processor 230, and/or the like
  • Respective TDD configurations of the first base station and the second base station may conflict with each other. For example, a downlink symbol of the first base station may overlap an uplink symbol of the second base station, or vice versa.
  • process 900 may include performing an interference management operation based at least in part on the reference signal (block 920) .
  • the first base station e.g., using antenna 234, MOD/DEMOD 232, MIMO detector 236, receive processor 238, controller/processor 240, transmit processor 220, TX MIMO processor 230, and/or the like
  • Process 900 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.
  • the reference signal is associated with a timing advance value to cause the reference signal to align with a OFDM symbol timing of a recipient base station of the first base station and the second base station. In some aspects, the reference signal is associated with a timing advance value to cause the reference signal to align with another reference signal for interference management transmitted by another base station other than the first base station or the second base station. In some aspects, the reference signal is associated with a cyclic prefix of a length greater than a cyclic prefix of a data or control symbol of the first base station.
  • the reference signal is associated with a cyclic prefix that is at least as long, in time, as a longest propagation delay between the first base station and another base station. In some aspects, the reference signal is associated with a different numerology than at least one of a configured numerology of the first base station or a configurated numerology of the second base station. In some aspects, the first base station is associated with a different numerology than the second base station.
  • the reference signal partially overlaps a OFDM symbol of the first base station.
  • the first base station may drop data of the OFDM symbol.
  • the reference signal has a same numerology as the OFDM symbol and is not time-aligned with the OFDM symbol.
  • the reference signal has a larger numerology than the OFDM symbol and collides with the OFDM symbol in time.
  • the reference signal has a smaller numerology than the OFDM symbol, and the reference signal at least partially overlaps two or more OFDM symbols in time.
  • the reference signal is transmitted with a frequency-domain guard band between the reference signal and a data or control transmission.
  • the reference signal is fully overlapped with a OFDM symbol of the first base station in time, and the reference signal is frequency division multiplexed with the OFDM symbol.
  • the reference signal is configured based at least in part on information that indicates at least one of a scrambling identifier of the reference signal, a transmission periodicity of the reference signal, a slot in which the reference signal is to be transmitted, a sub-band in which the reference signal is to be transmitted, a mini-band in which the reference signal is to be transmitted, or a rate-matching configuration for the first base station or the second base station.
  • the reference signal is configured based at least in part on information that indicates at least one of a starting symbol of the reference signal, a timing advance of the reference signal, or a cyclic prefix length of the reference signal.
  • the reference signal is a single OFDM symbol in length. In some aspects, the reference signal is two or more OFDM symbols in length, and wherein the reference signal comprises different waveforms for the two or more OFDM symbols. In some aspects, the reference signal is transmitted using a frequency-domain comb. In some aspects, the reference signal is transmitted using a resource element-level comb offset. In some aspects, the resource element-level comb offset indicates a transmitter identifier or other control information. In some aspects, the reference signal is transmitted using an orthogonal cover code. In some aspects, the orthogonal cover code indicates a transmitter identifier or other control information.
  • the first base station may perform rate matching based at least in part on the reference signal.
  • process 900 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 9. Additionally, or alternatively, two or more of the blocks of process 900 may be performed in parallel.
  • ком ⁇ онент is intended to be broadly construed as hardware, firmware, or a combination of hardware and software.
  • a processor is implemented in hardware, firmware, or a combination of hardware and software.
  • satisfying a threshold may refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, and/or the like.
  • “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c) .

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Abstract

Selon divers aspects, l'invention se rapporte d'une manière générale à la communication sans fil. Selon certains aspects, une première station de base peut : communiquer un signal de référence pour une gestion d'interférences entre la première station de base et une seconde station de base, les configurations de duplexage par répartition dans le temps respectives de la première station de base et de la seconde station de base étant en conflit l'une avec l'autre ; et effectuer une opération de gestion d'interférences d'après au moins en partie le signal de référence. L'invention se présente également sous de nombreux autres aspects.
PCT/CN2019/070192 2019-01-03 2019-01-03 Signalisation de référence pour gestion d'interférences voisines WO2020140225A1 (fr)

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PCT/CN2019/130365 WO2020140888A1 (fr) 2019-01-03 2019-12-31 Signalisation de référence pour gestion d'interférences voisines
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