WO2020057581A1 - Gestion d'interférence à distance à l'aide d'un signal de balise - Google Patents

Gestion d'interférence à distance à l'aide d'un signal de balise Download PDF

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Publication number
WO2020057581A1
WO2020057581A1 PCT/CN2019/106593 CN2019106593W WO2020057581A1 WO 2020057581 A1 WO2020057581 A1 WO 2020057581A1 CN 2019106593 W CN2019106593 W CN 2019106593W WO 2020057581 A1 WO2020057581 A1 WO 2020057581A1
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WIPO (PCT)
Prior art keywords
base station
reference signal
beacon signal
beacon
signal
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PCT/CN2019/106593
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English (en)
Inventor
Yuwei REN
Yu Zhang
Huilin Xu
Tingfang Ji
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Qualcomm Incorporated
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Publication of WO2020057581A1 publication Critical patent/WO2020057581A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • 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
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • 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
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/10—Dynamic resource partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • aspects of the present disclosure generally relate to wireless communication, and more particularly to techniques and apparatuses for remote interference management (RIM) using a beacon signal.
  • RIM remote 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, and/or the like) .
  • 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) .
  • 3GPP Third Generation Partnership Project
  • 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
  • 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 transmitting a beacon signal based at least in part on detecting remote interference from at least one other base station; and transmitting a reference signal based at least in part on the beacon signal.
  • a 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 transmit a beacon signal based at least in part on detecting remote interference from at least one other base station; and transmit a reference signal based at least in part on the beacon 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 base station, may cause the one or more processors to transmit a beacon signal based at least in part on detecting remote interference from at least one other base station; and transmit a reference signal based at least in part on the beacon signal.
  • an apparatus for wireless communication may include means for transmitting a beacon signal based at least in part on detecting remote interference from at least one base station; and means for transmitting a reference signal based at least in part on the beacon signal.
  • a method of wireless communication may include receiving a beacon signal from at least one other base station, wherein the beacon signal is associated with remote interference due to a transmission by the base station; and monitoring a resource for a reference signal based at least in part on the beacon signal.
  • a 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 receive a beacon signal from at least one other base station, wherein the beacon signal is associated with remote interference due to a transmission by the base station; and monitor a resource for a reference signal based at least in part on the beacon 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 base station, may cause the one or more processors to receive a beacon signal from at least one other base station, wherein the beacon signal is associated with remote interference due to a transmission by the base station; and monitor a resource for a reference signal based at least in part on the beacon signal.
  • an apparatus for wireless communication may include means for receiving a beacon signal from at least one base station, wherein the beacon signal is associated with remote interference due to a transmission by the apparatus; and means for monitoring a resource for a reference signal based at least in part on the beacon signal.
  • 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 remote interference between an aggressor base station and a victim base station, in accordance with various aspects of the present disclosure.
  • Fig. 4 is a diagram illustrating an example of reference signal transmission for remote interference management, in accordance with various aspects of the present disclosure.
  • Fig. 5 is a diagram illustrating an example of remote interference management using a beacon signal, in accordance with various aspects of the present disclosure.
  • Fig. 6 is a diagram illustrating an example process performed, for example, by a base station, in accordance with various aspects of the present disclosure.
  • Fig. 7 is a diagram illustrating an example process performed, for example, by a base station, in accordance with various aspects of the present disclosure.
  • 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, and/or the like.
  • Wireless network 100 may be a heterogeneous network that includes BSs of different types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/or the like. 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.
  • 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, and/or the like.
  • 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, a medical device or equipment, a biometric sensor or device, a wearable device (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, sensors, meters, monitors, location tags, and/or the like, 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 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, and/or the like.
  • a frequency may also be referred to as a carrier, a frequency channel, and/or the like.
  • 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.
  • 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 is 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) and/or the like) and control information (e.g., CQI requests, grants, upper layer signaling, and/or the like) 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 and/or the like) 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 and/or the like) 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 and/or the like) 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) , and/or the like.
  • 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, and/or the like) 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, and/or the like) , and transmitted to base station 110.
  • modulators 254a through 254r e.g., for DFT-s-OFDM, CP-OFDM, and/or the like
  • 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 remote interference management using a beacon signal, 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 600 of Fig. 6, process 700 of Fig. 7, 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.
  • base station 110 may include means for transmitting a beacon signal based at least in part on detecting remote interference from at least one other base station; means for transmitting a reference signal based at least in part on the beacon signal; means for receiving a beacon signal from at least one other base station, wherein the beacon signal is associated with remote interference due to a transmission by the base station; means for monitoring a resource for a reference signal based at least in part on the beacon signal; means for receiving the reference signal; means for performing a remote interference management operation based at least in part on the reference signal; means for monitoring the set of resources; means for performing a blind search of the resource; means for periodically monitoring for the beacon signal, wherein receiving the beacon signal is based at least in part on periodically monitoring for the beacon signal; means for receiving a plurality of beacon signals; and/or the like.
  • such means may include one or more components of base station 110 described in connection with Fig. 2.
  • Fig. 2 is provided merely as an example. Other examples may differ from what is described with regard to Fig. 2.
  • the downlink signal of a base station is observable within and around the edges of coverage areas of cells provided by the base station.
  • the downlink signal of the base station may propagate far beyond the coverage area (e.g., by tens of kilometers, hundreds of kilometers, and/or the like) , due to atmospheric ducting, reflections by mountains, the ocean surface, or clouds, and/or the like.
  • the downlink signal of the base station may create interference for another base station.
  • the base station that transmits the downlink signal may be referred to as an aggressor base station and the base station that receives the downlink signal may be referred to as a victim base station.
  • TDD time division duplexing
  • the victim base station, the aggressor base station, and/or another node may perform one or more remote interference management (RIM) operations to mitigate remote interference.
  • RIM remote interference management
  • the one or more RIM operations may be based at least in part on reference signals that may be transmitted by the victim base station and/or the aggressor base station.
  • the aggressor base station may transmit a reference signal (e.g., periodically) that may allow the victim base station to identify the interference from the aggressor base station.
  • the victim base station may transmit a reference signal (e.g., the same as or different from the aggressor base station’s reference signal) that indicates that the aggressor base station is to perform a RIM operation.
  • a reference signal e.g., the same as or different from the aggressor base station’s reference signal
  • the detection of the reference signal may be based at least in part on a blind search approach, wherein the aggressor base station may blindly search a set of resources (e.g., based at least in part on an ergodic detection procedure) based at least in part on potential sequences for the reference signal until a reference signal is identified or not identified.
  • a blind search approach wherein the aggressor base station may blindly search a set of resources (e.g., based at least in part on an ergodic detection procedure) based at least in part on potential sequences for the reference signal until a reference signal is identified or not identified.
  • the beacon signal may be transmitted by a victim base station that has detected interference from an aggressor base station.
  • the aggressor base station upon detecting or receiving the beacon signal, may determine that a reference signal (e.g., a reference signal for remote interference management) is to follow, and may monitor a resource associated with the reference signal accordingly. For example, the aggressor base station may not monitor the resource when the beacon signal has not been received, may skip some monitoring occasions when the beacon signal has not been received, and/or the like.
  • the aggressor base station may identify the resource, or a set of resources that includes the resource, based at least in part on the beacon signal. In this way, monitoring resources (e.g., time, monitoring energy, computational resource, and/or the like) of the aggressor base station are preserved. Furthermore, remote interference between the victim base station and the aggressor base station may be reduced.
  • Fig. 3 is a diagram illustrating an example 300 of remote interference between an aggressor base station and a victim base station, 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 may be physically distant from the victim base station (e.g., by tens of kilometers, hundreds of kilometers, and/or the like) .
  • the aggressor base station and the victim base station have the same TDD configuration. This may mean that the aggressor base station and the victim base station’s downlink periods, uplink periods, and gap periods are aligned in time.
  • a downlink signal transmitted by the aggressor base station may reach the victim base station.
  • the downlink signal may be reflected, may travel via an atmospheric duct, and/or the like.
  • the downlink signal may be associated with a delay. This may be a propagation delay due to the finite speed of light, material delays between the aggressor base station and the victim base station, and/or the like.
  • the downlink signal from the aggressor base station may collide with an uplink reception of the victim base station.
  • the victim base station may detect the downlink signal during the uplink period of the victim base station’s frame configuration.
  • the downlink signal may cause interference for the uplink reception of the victim base station.
  • the victim base station may transmit a beacon signal and a reference signal to the aggressor base station.
  • the beacon signal may indicate that the victim base station is to subsequently transmit a reference signal.
  • the reference signal may indicate that the victim base station is experiencing remote interference from the aggressor base station and/or may indicate that the aggressor base station is to perform one or more operations to mediate the remote interference.
  • 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 reference signal transmission for remote interference management, in accordance with various aspects of the present disclosure.
  • example 400 includes a transmitting base station (shown as Tx BS) (e.g., BS 110) , and a receiving base station (shown as Rx BS) (e.g., BS 110) .
  • Tx BS transmitting base station
  • Rx BS receiving base station
  • the transmitting base station is the aggressor base station
  • the receiving base station is the victim base station.
  • the aggressor base station may transmit a first reference signal (shown as RS1) .
  • the first reference signal may identify the aggressor base station.
  • the aggressor base station may transmit the first reference signal periodically.
  • the aggressor base station may transmit the first reference signal on demand, in connection with an instruction from another device, and/or the like.
  • the victim base station may monitor for the first reference signal. For example, the victim base station may monitor for the first reference signal to determine whether interference is associated with the aggressor base station (e.g., whether the interference is remote interference) and/or to identify the aggressor base station. Assume that the victim base station detects the first reference signal.
  • the victim base station may transmit a second reference signal (shown as RS2) .
  • the victim base station may transmit the second reference signal to the aggressor base station.
  • the victim base station may transmit the second reference signal to each aggressor base station from which interference was detected (e.g., based at least in part on first reference signals of each aggressor base station) .
  • the second reference signal may or may not be different from the first reference signal in terms of sequence, resource allocation, signal type, and/or the like.
  • the victim base station may select the second reference signal, such as a resource for the second reference signal or a sequence used to generate the second reference signal.
  • the victim base station may be allocated the second reference signal, such as the resource for the second reference signal or the sequence used to generate the second reference signal.
  • the first reference signal and the second reference signal may be generated using respective sequences.
  • the sequences may be selected from the same set of sequences.
  • the sequences may be selected from a partially overlapping set of sequences.
  • the sequences may be selected from different sets of sequences.
  • the first reference signal and/or the second reference signal may be referred to as a reference signal for remote interference management, a remote interference management reference signal, and/or the like.
  • the aggressor base station may monitor for the second reference signal.
  • the aggressor base station may monitor for the second reference signal using a blind search technique with regard to resources in which the second reference signal may be transmitted. In some aspects, this may involve hundreds or thousands of hypotheses for different sequences that may be used to generate the second reference signal. This may use significant time, network resources, and processor resources of the aggressor base station.
  • Some techniques and apparatuses described herein provide for the transmission of a beacon signal before transmission of the second reference signal.
  • the beacon signal may be transmitted before the second reference signal, and the monitoring for the second reference signal shown by reference number 440 may be performed based at least in part on the beacon signal.
  • the aggressor base station may know when a second reference signal is to be received, and may otherwise avoid scanning for the second reference signal, thereby conserving time, network resources, and processor resources of the aggressor base station.
  • 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 remote interference management using a beacon signal, in accordance with various aspects of the present disclosure.
  • example 500 includes an aggressor base station (BS) (e.g., BS 110) and a set of M victim base stations (BSs) (e.g., BSs 110) .
  • BS aggressor base station
  • BSs victim base stations
  • the operations described in connection with example 500 are equally applicable for a single aggressor base station and multiple victim base stations, multiple aggressor base stations and multiple victim base stations, and multiple aggressor base stations and a single victim base station.
  • the victim base station (s) and the aggressor base station (s) of example 500 are described in the singular as a victim base station and an aggressor base station.
  • the aggressor base station may transmit a downlink transmission, which may be received by the victim base station.
  • the downlink transmission may interfere with an uplink communication of the victim base station (e.g., from a UE that is covered by the victim base station) .
  • the victim base station may receive downlink transmissions from multiple aggressor base stations.
  • multiple victim base stations may receive downlink transmissions from a single aggressor base station, or from multiple aggressor base stations.
  • the victim base station may detect remote interference from the aggressor base station. For example, the victim base station may identify the downlink transmission as associated with the aggressor base station. In some aspects, the victim base station may identify the downlink transmission as associated with the aggressor base station based at least in part on a reference signal of the downlink transmission (e.g., the first reference signal of Fig. 4) . For example, the aggressor base station may transmit the reference signal (e.g., periodically, based at least in part on a sequence, and/or the like) , and the victim base station may detect the reference signal to identify the aggressor base station.
  • a reference signal of the downlink transmission e.g., the first reference signal of Fig. 4
  • the aggressor base station may transmit the reference signal (e.g., periodically, based at least in part on a sequence, and/or the like) , and the victim base station may detect the reference signal to identify the aggressor base station.
  • the victim base station may transmit a beacon signal to the aggressor base station.
  • the multiple victim base stations may transmit respective beacon signals to the aggressor base stations.
  • the victim base station may transmit a beacon signal to the multiple aggressor base stations (e.g., the same beacon signal or different beacon signals) .
  • the victim base station may transmit the beacon signal (and/or the corresponding reference signal) to the aggressor base station over an air interface.
  • the victim base station may provide the beacon signal (and/or the corresponding reference signal) to the aggressor base station in another fashion, such as over a backhaul or via an operation/administration/management device.
  • the beacon signal may be generated using a particular sequence.
  • the particular sequence may be used to generate beacon signals for all victim base stations.
  • the beacon signal may include or be based at least in part on an existing reference signal, such as a pilot signal, a sounding reference signal, an uplink control channel reference signal, and/or the like.
  • the beacon signal may indicate information for detecting the reference signal to be subsequently transmitted by the base station.
  • the reference signal may be generated using a sequence.
  • the beacon signal may identify the sequence, or may identify a set of sequences from which the sequence is to be selected.
  • the beacon signal may identify a resource in which the reference signal is to be transmitted, or may identify a set of resources including the resource in which the reference signal is to be transmitted. In this way, the beacon signal may reduce the number of hypotheses or blind search occasions that the aggressor base station may need to monitor to detect the reference signal, thereby conserving network and processor resources.
  • the victim base station eliminates the need for the aggressor to monitor all reference signal resources or sequences without the knowledge of whether a reference signal is coming.
  • the aggressor base station may detect the beacon signal based at least in part on monitoring for the beacon signal. For example, the aggressor base station may monitor for the beacon signal. In some aspects, the aggressor base station may monitor for the beacon signal periodically. For example, the aggressor base station may monitor a periodically reoccurring resource for the beacon signal. In some aspects, the aggressor base station may monitor for multiple beacon signals. For example, the aggressor base station may monitor for different resources, different sequences, and/or the like, to detect the multiple beacon signals. Thus, the aggressor base station may identify interference with regard to multiple victim base stations.
  • the victim base station may transmit a reference signal (e.g., the second reference signal of Fig. 4) based at least in part on the beacon signal.
  • the victim base station may transmit the reference signal using a resource based at least in part on the beacon signal.
  • the beacon signal may identify the resource, or may identify a set of resources that includes the resource.
  • the victim base station may generate the reference signal.
  • the victim base station may generate the reference signal using a sequence, which may be identified by the beacon signal or which may be selected from a set of sequences identified by the beacon signal. In this way, the victim base station may generate a reference signal that is detectable to the aggressor base station in accordance with the beacon signal that was transmitted to the aggressor base station.
  • the aggressor base station may detect the reference signal.
  • the aggressor base station may detect the reference signal based at least in part on monitoring a resource or a sequence associated with the reference signal.
  • monitoring the resource or the sequence may be triggered by the beacon signal.
  • the resource or the sequence may be identified by the beacon signal, or may be of a set of resources or sequences identified by the beacon signal.
  • the beacon signal reduces the number of blind search candidates to be scanned for the reference signal, thereby conserving resources of the aggressor base station.
  • the aggressor base station may perform a RIM operation based at least in part on the reference signal. For example, the aggressor base station may transmit another reference signal (e.g., another first reference signal) , may reduce a transmission power, may change a beam direction, may change a frame structure, and/or the like. In some aspects, the aggressor base station may provide information to another device, such as a network device, an operation/administration/management device, and/or the like, to facilitate remote interference management.
  • another reference signal e.g., another first reference signal
  • the aggressor base station may provide information to another device, such as a network device, an operation/administration/management device, and/or the like, to facilitate remote interference management.
  • the aggressor base station may monitor for another beacon signal. As further shown, when no beacon signal has been received, the aggressor base station may not monitor for a corresponding reference signal. Thus, network and processor resources of the aggressor base station are conserved. In some aspects, the aggressor base station may still monitor for a reference signal when no beacon has been received. For example, the aggressor base station may skip a subset of monitoring occasions, may monitor a subset of resources, and/or the like.
  • 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 process 600 performed, for example, by a base station, in accordance with various aspects of the present disclosure.
  • Example process 600 is an example where a base station (e.g., BS 110, the victim base station of Fig. 3, the victim base station of Fig. 4, and/or the victim base station of Fig. 5) performs remote interference management using a beacon signal.
  • a base station e.g., BS 110, the victim base station of Fig. 3, the victim base station of Fig. 4, and/or the victim base station of Fig. 5
  • process 600 may include transmitting a beacon signal based at least in part on detecting remote interference from at least one other base station (block 610) .
  • the base station e.g., using controller/processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and/or the like
  • the base station may transmit the beacon signal based at least in part on detecting remote interference from at least one other base station (e.g., an aggressor base station) .
  • the base station may transmit the beacon signal based at least in part on detecting a reference signal (e.g., a first reference signal) transmitted by the at least one other base station.
  • a reference signal e.g., a first reference signal
  • process 600 may include transmitting a reference signal based at least in part on the beacon signal (block 620) .
  • the base station e.g., using controller/processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and/or the like
  • may transmit a reference signal e.g., the second reference signal described elsewhere herein
  • the base station may transmit the reference signal after transmitting the beacon signal.
  • the base station may transmit and/or generate the reference signal using a resource or sequence identified or indicated by the beacon signal.
  • Process 600 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 indicates that the at least one other base station is to perform a remote interference management operation.
  • the beacon signal is selected from a set of beacon signals.
  • the beacon signal uses a configuration common to a set of base stations.
  • the base station is one of a plurality of base stations that have detected remote interference and the beacon signal is one of a plurality of different beacon signals corresponding to the plurality of base stations.
  • the beacon signal is based at least in part on at least one of a pilot signal, a sounding reference signal, or another type of reference signal.
  • the beacon signal uses a dedicated sequence.
  • the dedicated sequence is known to the base station and the one or more other base stations.
  • the beacon signal identifies a resource for the reference signal. In a ninth aspect, alone or in combination with any one or more of the first through eighth aspects, the beacon signal identifies resources for a set of reference signals including the reference signal. In a tenth aspect, alone or in combination with any one or more of the first through ninth aspects, the beacon indicates the reference signal or a sequence to be used for the reference signal. In an eleventh aspect, alone or in combination with any one or more of the first through tenth aspects, the beacon signal indicates a set of reference signals or sequences from which the reference signal or a sequence used to generate the reference signal is selected.
  • the remote interference is from a downlink communication of the at least one other base station and the remote interference interferes with an uplink communication of the base station.
  • the base station and the at least one other base station are associated with a same time division duplexing (TDD) configuration.
  • TDD time division duplexing
  • process 600 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 6. Additionally, or alternatively, two or more of the blocks of process 600 may be performed in parallel.
  • Fig. 7 is a diagram illustrating an example process 700 performed, for example, by a base station, in accordance with various aspects of the present disclosure.
  • Example process 700 is an example where a base station (e.g., BS 110, the aggressor base station of Fig. 3, the aggressor base station of Fig. 4, and/or the aggressor base station of Fig. 5) performs remote interference management using a beacon signal.
  • a base station e.g., BS 110, the aggressor base station of Fig. 3, the aggressor base station of Fig. 4, and/or the aggressor base station of Fig. 5
  • process 700 may include receiving a beacon signal from at least one other base station, wherein the beacon signal is associated with remote interference due to a transmission by the base station (block 710) .
  • the base station e.g., using antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller/processor 240, and/or the like
  • the beacon signal may be associated with remote interference due to a transmission by the base station.
  • the at least one other base station may transmit or provide the beacon signal based at least in part on detecting a transmission (e.g., a downlink transmission) of the base station (e.g., based at least in part on a first reference signal transmitted by the base station) .
  • a transmission e.g., a downlink transmission
  • the beacon signal and the reference signal may be a same signal or a same type of signal.
  • the beacon signal may be a different type of signal than the reference signal.
  • process 700 may include monitoring a resource for a reference signal based at least in part on the beacon signal (block 720) .
  • the base station e.g., using antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller/processor 240, and/or the like
  • the beacon signal may indicate or identify the resource or a set of resources including the resource.
  • the base station may monitor the resource based at least in part on a sequence or a set of sequences for the reference signal, wherein the sequence or the set of sequences is identified by the beacon signal.
  • Process 700 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 base station may receive the reference signal.
  • the base station may perform a remote interference management operation based at least in part on the reference signal.
  • the beacon signal identifies the resource for the reference signal.
  • the beacon signal identifies a set of resources including the resource, and the base station may monitor the set of resources.
  • the beacon indicates the reference signal or a sequence to be used for the reference signal.
  • the beacon signal indicates a set of reference signals or sequences from which the reference signal or a sequence used to generate the reference signal is selected.
  • monitoring the resource further comprises performing a blind search of the resource.
  • the base station may periodically monitor for the beacon signal, wherein receiving the beacon signal is based at least in part on periodically monitoring for the beacon signal.
  • monitoring the resource for the reference signal is triggered by receiving the beacon signal.
  • the beacon signal is specific to the at least one other base station.
  • receiving the beacon signal further comprises receiving a plurality of beacon signals.
  • the plurality of beacon signals correspond to a plurality of other base stations including the at least one other base station, and the plurality of beacon signals are of a set of beacon signals.
  • the plurality of beacon signals are based at least in part on a same sequence.
  • process 700 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 7. Additionally, or alternatively, two or more of the blocks of process 700 may be performed in parallel.
  • the term component 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) .
  • the terms “has, ” “have, ” “having, ” and/or the like are intended to be open-ended terms. Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise.

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Abstract

Divers aspects de la présente invention concernent de manière générale la communication sans fil. Selon certains aspects, une station de base peut : transmettre un signal de balise sur la base, au moins en partie, de la détection d'une interférence à distance à partir d'au moins une autre station de base ; et transmettre un signal de référence sur la base, au moins en partie, du signal de balise. Selon certains aspects, une station de base peut : recevoir un signal de balise, d'au moins une autre station de base, le signal de balise étant associé à une interférence à distance due à une transmission par la station de base ; et surveiller une ressource pour un signal de référence sur la base, au moins en partie, du signal de balise. L'invention se présente également sous de nombreux autres aspects.
PCT/CN2019/106593 2018-09-21 2019-09-19 Gestion d'interférence à distance à l'aide d'un signal de balise WO2020057581A1 (fr)

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WO2016172888A1 (fr) * 2015-04-29 2016-11-03 Telefonaktiebolaget Lm Ericsson (Publ) Procédés et appareils pour une mesure inter-réseau dans un réseau sans fil
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