WO2020061721A1 - Atténuation de brouillage intercellulaire contrôlée de manière centralisée - Google Patents

Atténuation de brouillage intercellulaire contrôlée de manière centralisée Download PDF

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Publication number
WO2020061721A1
WO2020061721A1 PCT/CN2018/107175 CN2018107175W WO2020061721A1 WO 2020061721 A1 WO2020061721 A1 WO 2020061721A1 CN 2018107175 W CN2018107175 W CN 2018107175W WO 2020061721 A1 WO2020061721 A1 WO 2020061721A1
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WIPO (PCT)
Prior art keywords
victim
aggressor
rss
transmission
configuration
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PCT/CN2018/107175
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English (en)
Inventor
Yiqing Cao
Huilin Xu
Wanshi Chen
Yuwei REN
Tingfang Ji
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Qualcomm Incorporated
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Publication date
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Priority to PCT/CN2018/107175 priority Critical patent/WO2020061721A1/fr
Publication of WO2020061721A1 publication Critical patent/WO2020061721A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • 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
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Definitions

  • aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for centrally-controlled inter-cell interference mitigation.
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, etc. These 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. ) .
  • available system resources e.g., bandwidth, transmit power, etc.
  • multiple-access systems examples include 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) systems, LTE Advanced (LTE-A) systems, 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, and time division synchronous code division multiple access (TD-SCDMA) systems, to name a few.
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • LTE-A LTE Advanced
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • a wireless multiple-access communication system may include a number of base stations (BSs) , which are each capable of simultaneously supporting communication for multiple communication devices, otherwise known as user equipments (UEs) .
  • BSs base stations
  • UEs user equipments
  • a set of one or more base stations may define an eNodeB (eNB) .
  • eNB eNodeB
  • a wireless multiple access communication system may include a number of distributed units (DUs) (e.g., edge units (EUs) , edge nodes (ENs) , radio heads (RHs) , smart radio heads (SRHs) , transmission reception points (TRPs) , etc.
  • DUs distributed units
  • EUs edge units
  • ENs edge nodes
  • RHs radio heads
  • SSRHs smart radio heads
  • TRPs transmission reception points
  • CUs central units
  • CNs central nodes
  • ANCs access node controllers
  • a base station or distributed unit may communicate with a set of UEs on downlink channels (e.g., for transmissions from a base station or to a UE) and uplink channels (e.g., for transmissions from a UE to a base station or distributed unit) .
  • New Radio (e.g., 5G) is an example of an emerging telecommunication standard.
  • NR is a set of enhancements to the LTE mobile standard promulgated by 3GPP. It 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 OFDMA with a cyclic prefix (CP) on the downlink (DL) and on the uplink (UL) .
  • CP cyclic prefix
  • NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.
  • MIMO multiple-input multiple-output
  • Certain aspects provide a method for wireless communication performed by a central controller.
  • the method generally includes determining a first configuration for a first victim-aggressor pair including a first victim base station (BS) and a first aggressor base station (BS) to use to mitigate interference, wherein the first configuration indicates time and frequency resources for transmission of victim reference signals (RSs) by the first victim BS to indicate the presence of interference and for transmission of aggressor reference signals (RSs) by the first aggressor BS to indicate detection of victim RSs, wherein the first configuration is based at least in part on feedback from the first victim-aggressor pair.
  • the method also generally includes transmitting the first configuration to the first victim-aggressor pair.
  • the apparatus generally includes at least one processor configured to determine a first configuration for a first victim-aggressor pair including a first victim base station (BS) and a first aggressor base station (BS) to use to mitigate interference, wherein the first configuration indicates time and frequency resources for transmission of victim reference signals (RSs) by the first victim BS to indicate the presence of interference and for transmission of aggressor reference signals (RSs) by the first aggressor BS to indicate detection of victim RSs, wherein the first configuration is based at least in part on feedback from the first victim-aggressor pair.
  • the at least one processor may also be configured to transmit the first configuration to the first victim-aggressor pair.
  • the apparatus may also generally include a memory coupled with the at least one processor.
  • the apparatus generally includes means for determining a first configuration for a first victim-aggressor pair including a first victim base station (BS) and a first aggressor base station (BS) to use to mitigate interference, wherein the first configuration indicates time and frequency resources for transmission of victim reference signals (RSs) by the first victim BS to indicate the presence of interference and for transmission of aggressor reference signals (RSs) by the first aggressor BS to indicate detection of victim RSs, wherein the first configuration is based at least in part on feedback from the first victim-aggressor pair.
  • the apparatus also generally includes means for transmitting the first configuration to the first victim-aggressor pair.
  • the non-transitory computer-readable medium generally includes instructions that, when executed by at least one processor, configure the at least one processor to determine a first configuration for a first victim-aggressor pair including a first victim base station (BS) and a first aggressor base station (BS) to use to mitigate interference, wherein the first configuration indicates time and frequency resources for transmission of victim reference signals (RSs) by the first victim BS to indicate the presence of interference and for transmission of aggressor reference signals (RSs) by the first aggressor BS to indicate detection of victim RSs, wherein the first configuration is based at least in part on feedback from the first victim-aggressor pair.
  • the non-transitory computer-readable medium also generally includes instructions that configure the at least one processor to transmit the first configuration to the first victim-aggressor pair.
  • Certain aspects provide a method for wireless communication performed by a victim base station (BS) .
  • the method generally includes detecting interference in one or more transmissions caused by a first aggressor BSs, transmitting an interference report, indicating the detected interference, to a central controller (CC) , receiving, in response to the interference report, a first configuration for a victim-aggressor pair including the first victim BS and the first aggressor BS to use to mitigate the detected interference, wherein the first configuration indicates time and frequency resources for transmission of victim reference signals (RSs) by the first victim BS to indicate the presence of interference and for transmission of aggressor reference signals (RSs) by the first aggressor BS to indicate detection of victim RSs, wherein the first configuration is based at least in part on feedback from the first victim-aggressor pair, transmitting one or more victim RSs according to the first configuration upon detecting the interference, and receiving one or more aggressor RSs, in response to the first victim RS, based on the first configuration.
  • RSs victim reference signals
  • the apparatus generally includes at least one processor configured to detect interference in one or more transmissions caused by a first aggressor BSs, transmit an interference report, indicating the detected interference, to a central controller (CC) , receive, in response to the interference report, a first configuration for a victim-aggressor pair including the first victim BS and the first aggressor BS to use to mitigate the detected interference, wherein the first configuration indicates time and frequency resources for transmission of victim reference signals (RSs) by the first victim BS to indicate the presence of interference and for transmission of aggressor reference signals (RSs) by the first aggressor BS to indicate detection of victim RSs, wherein the first configuration is based at least in part on feedback from the first victim-aggressor pair, transmit one or more victim RSs according to the first configuration upon detecting the interference, and receive one or more aggressor RSs, in response to the first victim RS, based on the first configuration.
  • the apparatus may also generally include a memory coupled
  • the apparatus generally includes means for detecting interference in one or more transmissions caused by a first aggressor BSs, means for transmitting an interference report, indicating the detected interference, to a central controller (CC) , means for receiving, in response to the interference report, a first configuration for a victim-aggressor pair including the first victim BS and the first aggressor BS to use to mitigate the detected interference, wherein the first configuration indicates time and frequency resources for transmission of victim reference signals (RSs) by the first victim BS to indicate the presence of interference and for transmission of aggressor reference signals (RSs) by the first aggressor BS to indicate detection of victim RSs, wherein the first configuration is based at least in part on feedback from the first victim-aggressor pair, means for transmitting one or more victim RSs according to the first configuration upon detecting the interference, and means for receiving one or more aggressor RSs, in response to the first victim RS, based on the first configuration.
  • RSs victim reference signals
  • RSs aggressor reference signals
  • the non-transitory computer-readable medium generally includes instructions that, when executed by at least one processor, configure the at least one processor to detect interference in one or more transmissions caused by a first aggressor BSs, transmit an interference report, indicating the detected interference, to a central controller (CC) , receive, in response to the interference report, a first configuration for a victim-aggressor pair including the first victim BS and the first aggressor BS to use to mitigate the detected interference, wherein the first configuration indicates time and frequency resources for transmission of victim reference signals (RSs) by the first victim BS to indicate the presence of interference and for transmission of aggressor reference signals (RSs) by the first aggressor BS to indicate detection of victim RSs, wherein the first configuration is based at least in part on feedback from the first victim-aggressor pair, transmit one or more victim RSs according to the first configuration upon detecting the interference, and receive one or more aggressor
  • the method generally includes receiving a first configuration for a victim-aggressor pair including the first victim BS and the first aggressor BS to use to mitigate the detected interference, wherein the first configuration indicates time and frequency resources for transmission of victim reference signals (RSs) by the first victim BS to indicate the presence of interference and for transmission of aggressor reference signals (RSs) by the first aggressor BS to indicate detection of victim RSs, wherein the first configuration is based at least in part on feedback from the first victim-aggressor pair, monitoring for victim RSs according to the first configuration, and transmitting, in response to detecting a victim RS, one or more aggressor RS according to the first configuration.
  • RSs victim reference signals
  • RSs aggressor reference signals
  • the apparatus generally includes at least one processor configured to receive a first configuration for a victim-aggressor pair including the first victim BS and the first aggressor BS to use to mitigate the detected interference, wherein the first configuration indicates time and frequency resources for transmission of victim reference signals (RSs) by the first victim BS to indicate the presence of interference and for transmission of aggressor reference signals (RSs) by the first aggressor BS to indicate detection of victim RSs, wherein the first configuration is based at least in part on feedback from the first victim-aggressor pair, monitor for victim RSs according to the first configuration, and transmit, in response to detecting a victim RS, one or more aggressor RS according to the first configuration.
  • the apparatus may also generally include a memory coupled with the at least one processor.
  • the apparatus generally includes means for receiving a first configuration for a victim-aggressor pair including the first victim BS and the first aggressor BS to use to mitigate the detected interference, wherein the first configuration indicates time and frequency resources for transmission of victim reference signals (RSs) by the first victim BS to indicate the presence of interference and for transmission of aggressor reference signals (RSs) by the first aggressor BS to indicate detection of victim RSs, wherein the first configuration is based at least in part on feedback from the first victim-aggressor pair, means for monitoring for victim RSs according to the first configuration, and means for transmitting, in response to detecting a victim RS, one or more aggressor RS according to the first configuration.
  • RSs victim reference signals
  • RSs aggressor reference signals
  • the non-transitory computer-readable medium generally includes instructions that, when executed by at least one processor, configure the at least one processor to receive a first configuration for a victim-aggressor pair including the first victim BS and the first aggressor BS to use to mitigate the detected interference, wherein the first configuration indicates time and frequency resources for transmission of victim reference signals (RSs) by the first victim BS to indicate the presence of interference and for transmission of aggressor reference signals (RSs) by the first aggressor BS to indicate detection of victim RSs, wherein the first configuration is based at least in part on feedback from the first victim-aggressor pair, monitor for victim RSs according to the first configuration, and transmit, in response to detecting a victim RS, one or more aggressor RS according to the first configuration.
  • RSs victim reference signals
  • RSs aggressor reference signals
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the appended drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed.
  • FIG. 1 is a block diagram conceptually illustrating an example telecommunications system, in accordance with certain aspects of the present disclosure.
  • FIG. 2 is a block diagram illustrating an example logical architecture of a distributed radio access network (RAN) , in accordance with certain aspects of the present disclosure.
  • RAN radio access network
  • FIG. 3 is a diagram illustrating an example physical architecture of a distributed RAN, in accordance with certain aspects of the present disclosure.
  • FIG. 4 is a block diagram conceptually illustrating a design of an example base station (BS) and user equipment (UE) , in accordance with certain aspects of the present disclosure.
  • BS base station
  • UE user equipment
  • FIG. 5 is a diagram showing examples for implementing a communication protocol stack, in accordance with certain aspects of the present disclosure.
  • FIG. 6 illustrates an example of a frame format for a new radio (NR) system, in accordance with certain aspects of the present disclosure.
  • NR new radio
  • FIG. 7 illustrates example resources used for transmitting a victim reference signal (RS) and an aggressor reference signal, according to aspects of the present disclosure.
  • RS victim reference signal
  • FIG. 7 illustrates example resources used for transmitting a victim reference signal (RS) and an aggressor reference signal, according to aspects of the present disclosure.
  • FIG. 8a illustrates RS transmissions between a victim base station (BS) and an aggressor BS, which are at a distance D1 from each other, according to aspects of the present disclosure.
  • FIG. 8b illustrates RS transmissions between a victim base station (BS) and an aggressor BS, which are at a distance D2 from each other, according to aspects of the present disclosure.
  • FIG. 9 illustrates example operations performed by a central controller, according to aspects of the present disclosure.
  • FIG. 10 illustrates example operations performed by a victim BS, according to aspects of the present disclosure
  • FIG. 11 illustrates example operations performed by an aggressor BS, according to aspects of the present disclosure.
  • FIG. 12 is a call-flow diagram illustrating an example inter-cell interference mitigation procedure, according to aspects of the present disclosure.
  • aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable mediums for centrally-controlled inter-cell interference mitigation.
  • a CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA) , cdma2000, etc.
  • UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA.
  • cdma2000 covers IS-2000, IS-95 and IS-856 standards.
  • a TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM) .
  • An OFDMA network may implement a radio technology such as NR (e.g.
  • E-UTRA Evolved UTRA
  • UMB Ultra Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • IEEE 802.16 WiMAX
  • IEEE 802.20 Flash-OFDMA
  • UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS) .
  • New Radio is an emerging wireless communications technology under development in conjunction with the 5G Technology Forum (5GTF) .
  • 3GPP Long Term Evolution (LTE) and LTE-Advanced (LTE-A) are releases of UMTS that use E-UTRA.
  • UTRA, E-UTRA, UMTS, LTE, LTE-Aand GSM are described in documents from an organization named “3rd Generation Partnership Project” (3GPP) .
  • cdma2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) .
  • the techniques described herein may be used for the wireless networks and radio technologies mentioned above as well as other wireless networks and radio technologies. For clarity, while 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.
  • New radio (NR) access may support various wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth (e.g., 80 MHz or beyond) , millimeter wave (mmW) targeting high carrier frequency (e.g., 25 GHz or beyond) , massive machine type communications MTC (mMTC) targeting non-backward compatible MTC techniques, and/or mission critical targeting ultra-reliable low-latency communications (URLLC) .
  • eMBB enhanced mobile broadband
  • mmW millimeter wave
  • mMTC massive machine type communications MTC
  • URLLC ultra-reliable low-latency communications
  • These services may include latency and reliability requirements.
  • These services may also have different transmission time intervals (TTI) to meet respective quality of service (QoS) requirements.
  • TTI transmission time intervals
  • QoS quality of service
  • these services may co-exist in the same subframe.
  • FIG. 1 illustrates an example wireless communication network 100 in which aspects of the present disclosure may be performed.
  • the wireless communication network 100 may be a New Radio (NR) or 5G network.
  • the wireless communication network 100 may be an LTE network.
  • the wireless network 100 may include a number of base stations (BSs) 110 and other network entities.
  • a BS may be a station that communicates with user equipments (UEs) .
  • Each BS 110 may provide communication coverage for a particular geographic area.
  • the term “cell” can refer to a coverage area of a Node B (NB) and/or a Node B subsystem serving this coverage area, depending on the context in which the term is used.
  • gNB next generation NodeB
  • NR BS new radio base station
  • 5G NB access point
  • AP access point
  • TRP transmission reception point
  • 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 base stations may be interconnected to one another and/or to one or more other base stations or network nodes (not shown) in wireless communication network 100 through various types of backhaul interfaces, such as a direct physical connection, a wireless connection, a virtual network, or the like using any suitable transport network.
  • any number of wireless networks may be deployed in a given geographic area.
  • Each wireless network may support a particular radio access technology (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 subcarrier, a frequency channel, a tone, a subband, 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 base station may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or other types of cells.
  • 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 an association with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG) , UEs for users in the home, etc. ) .
  • CSG Closed Subscriber Group
  • 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.
  • the BSs 110a, 110b and 110c may be macro BSs for the macro cells 102a, 102b and 102c, respectively.
  • the BS 110x may be a pico BS for a pico cell 102x.
  • the BSs 110y and 110z may be femto BSs for the femto cells 102y and 102z, respectively.
  • a BS may support one or multiple (e.g., three) cells.
  • Wireless communication network 100 may also include relay stations.
  • a relay station is a station that receives a transmission of data and/or other information from an upstream station (e.g., a BS or a UE) and sends a transmission of the data and/or other information to a downstream station (e.g., a UE or a BS) .
  • a relay station may also be a UE that relays transmissions for other UEs.
  • a relay station 110r may communicate with the BS 110a and a UE 120r in order to facilitate communication between the BS 110a and the UE 120r.
  • a relay station may also be referred to as a relay BS, a relay, etc.
  • Wireless network 100 may be a heterogeneous network that includes BSs of different types, e.g., macro BS, pico BS, femto BS, relays, etc. These different types of BSs may have different transmit power levels, different coverage areas, and different impact on interference in the wireless network 100.
  • macro BS may have a high transmit power level (e.g., 20 Watts) whereas pico BS, femto BS, and relays may have a lower transmit power level (e.g., 1 Watt) .
  • Wireless communication network 100 may support synchronous or asynchronous operation.
  • the BSs may have similar frame timing, and transmissions from different BSs may be approximately aligned in time.
  • the BSs may have different frame timing, and transmissions from different BSs may not be aligned in time.
  • the techniques described herein may be used for both synchronous and asynchronous operation.
  • a network controller 130 may couple to a set of BSs and provide coordination and control for these BSs.
  • the network controller 130 may communicate with the BSs 110 via a backhaul.
  • the BSs 110 may also communicate with one another (e.g., directly or indirectly) via wireless or wireline backhaul.
  • the UEs 120 may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile.
  • a UE may also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a Customer Premises Equipment (CPE) , a cellular phone, 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 computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, an appliance, a medical device or medical equipment, a biometric sensor/device, a wearable device such as a smart watch, smart clothing, smart glasses, a smart wrist band, smart jewelry (e.g., a smart ring, a smart bracelet, etc.
  • CPE Customer Premises Equipment
  • PDA personal digital assistant
  • WLL wireless local loop
  • MTC machine-type communication
  • eMTC evolved MTC
  • MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., that may communicate with a BS, 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.
  • a network e.g., a wide area network such as Internet or a cellular network
  • Some UEs may be considered Internet-of-Things (IoT) devices, which may be narrowband IoT (NB-IoT) devices.
  • IoT Internet-of-Things
  • NB-IoT narrowband IoT
  • Certain wireless networks utilize orthogonal frequency division multiplexing (OFDM) on the downlink and single-carrier frequency division multiplexing (SC-FDM) on the uplink.
  • OFDM and SC-FDM partition the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, bins, etc.
  • K orthogonal subcarriers
  • Each subcarrier may be modulated with data.
  • modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDM.
  • the spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may be dependent on the system bandwidth.
  • the spacing of the subcarriers may be 15 kHz and the minimum resource allocation (called a “resource block” (RB) ) may be 12 subcarriers (or 180 kHz) . Consequently, the nominal Fast Fourier Transfer (FFT) size may be equal to 128, 256, 512, 1024 or 2048 for system bandwidth of 1.25, 2.5, 5, 10, or 20 megahertz (MHz) , respectively.
  • the system bandwidth may also be partitioned into subbands. For example, a subband may cover 1.08 MHz (i.e., 6 resource blocks) , and there may be 1, 2, 4, 8, or 16 subbands for system bandwidth of 1.25, 2.5, 5, 10 or 20 MHz, respectively.
  • NR may utilize OFDM with a CP on the uplink and downlink and include support for half-duplex operation using TDD. Beamforming may be supported and beam direction may be dynamically configured. MIMO transmissions with precoding may also be supported. MIMO configurations in the DL may support up to 8 transmit antennas with multi-layer DL transmissions up to 8 streams and up to 2 streams per UE. Multi-layer transmissions with up to 2 streams per UE may be supported. Aggregation of multiple cells may be supported with up to 8 serving cells.
  • a scheduling entity (e.g., a base station) allocates resources for communication among some or all devices and equipment within its service area or cell.
  • 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.
  • a UE may function as a scheduling entity and may schedule resources for one or more subordinate entities (e.g., one or more other UEs) , and the other UEs may utilize the 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.
  • P2P peer-to-peer
  • UEs may communicate directly with one another in addition to communicating with a scheduling entity.
  • a solid line with double arrows indicates desired transmissions between a UE and a serving BS, which is a BS designated to serve the UE on the downlink and/or uplink.
  • a finely dashed line with double arrows indicates interfering transmissions between a UE and a BS.
  • FIG. 2 illustrates an example logical architecture of a distributed Radio Access Network (RAN) 200, which may be implemented in the wireless communication network 100 illustrated in FIG. 1.
  • a 5G access node 206 may include an access node controller (ANC) 202.
  • ANC 202 may be a central unit (CU) of the distributed RAN 200.
  • the backhaul interface to the Next Generation Core Network (NG-CN) 204 may terminate at ANC 202.
  • the backhaul interface to neighboring next generation access Nodes (NG-ANs) 210 may terminate at ANC 202.
  • ANC 202 may include one or more transmission reception points (TRPs) 208 (e.g., cells, BSs, gNBs, etc. ) .
  • TRPs transmission reception points
  • the TRPs 208 may be a distributed unit (DU) .
  • TRPs 208 may be connected to a single ANC (e.g., ANC 202) or more than one ANC (not illustrated) .
  • a single ANC e.g., ANC 202
  • ANC e.g., ANC 202
  • RaaS radio as a service
  • TRPs 208 may be connected to more than one ANC.
  • TRPs 208 may each include one or more antenna ports.
  • TRPs 208 may be configured to individually (e.g., dynamic selection) or jointly (e.g., joint transmission) serve traffic to a UE.
  • the logical architecture of distributed RAN 200 may support fronthauling solutions across different deployment types.
  • the logical architecture may be based on transmit network capabilities (e.g., bandwidth, latency, and/or jitter) .
  • next generation access node (NG-AN) 210 may support dual connectivity with NR and may share a common fronthaul for LTE and NR.
  • NG-AN next generation access node
  • the logical architecture of distributed RAN 200 may enable cooperation between and among TRPs 208, for example, within a TRP and/or across TRPs via ANC 202.
  • An inter-TRP interface may not be used.
  • Logical functions may be dynamically distributed in the logical architecture of distributed RAN 200.
  • the Radio Resource Control (RRC) layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, Medium Access Control (MAC) layer, and a Physical (PHY) layers may be adaptably placed at the DU (e.g., TRP 208) or CU (e.g., ANC 202) .
  • RRC Radio Resource Control
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Medium Access Control
  • PHY Physical
  • FIG. 3 illustrates an example physical architecture of a distributed Radio Access Network (RAN) 300, according to aspects of the present disclosure.
  • a centralized core network unit (C-CU) 302 may host core network functions.
  • C-CU 302 may be centrally deployed.
  • C-CU 302 functionality may be offloaded (e.g., to advanced wireless services (AWS) ) , in an effort to handle peak capacity.
  • AWS advanced wireless services
  • a centralized RAN unit (C-RU) 304 may host one or more ANC functions.
  • the C-RU 304 may host core network functions locally.
  • the C-RU 304 may have distributed deployment.
  • the C-RU 304 may be close to the network edge.
  • a DU 306 may host one or more TRPs (Edge Node (EN) , an Edge Unit (EU) , a Radio Head (RH) , a Smart Radio Head (SRH) , or the like) .
  • the DU may be located at edges of the network with radio frequency (RF) functionality.
  • RF radio frequency
  • FIG. 4 illustrates example components of BS 110 and UE 120 (as depicted in FIG. 1) , which may be used to implement aspects of the present disclosure.
  • antennas 452, processors 466, 458, 464, and/or controller/processor 480 of the UE 120 and/or antennas 434, processors 420, 460, 438, and/or controller/processor 440 of the BS 110 may be used to perform the various techniques and methods described herein (e.g., operations described in FIGs. 9-11) .
  • a transmit processor 420 may receive data from a data source 412 and control information from a controller/processor 440.
  • the control information may be for the physical broadcast channel (PBCH) , physical control format indicator channel (PCFICH) , physical hybrid ARQ indicator channel (PHICH) , physical downlink control channel (PDCCH) , group common PDCCH (GC PDCCH) , etc.
  • the data may be for the physical downlink shared channel (PDSCH) , etc.
  • the processor 420 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively.
  • the processor 420 may also generate reference symbols, e.g., for the primary synchronization signal (PSS) , secondary synchronization signal (SSS) , and cell-specific reference signal (CRS) .
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 430 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) 432a through 432t. Each modulator 432 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream.
  • Each modulator may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • Downlink signals from modulators 432a through 432t may be transmitted via the antennas 434a through 434t, respectively.
  • the antennas 452a through 452r may receive the downlink signals from the base station 110 and may provide received signals to the demodulators (DEMODs) in transceivers 454a through 454r, respectively.
  • Each demodulator 454 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples.
  • Each demodulator may further process the input samples (e.g., for OFDM, etc. ) to obtain received symbols.
  • a MIMO detector 456 may obtain received symbols from all the demodulators 454a through 454r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 458 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 120 to a data sink 460, and provide decoded control information to a controller/processor 480.
  • a transmit processor 464 may receive and process data (e.g., for the physical uplink shared channel (PUSCH) ) from a data source 462 and control information (e.g., for the physical uplink control channel (PUCCH) from the controller/processor 480.
  • the transmit processor 464 may also generate reference symbols for a reference signal (e.g., for the sounding reference signal (SRS) ) .
  • the symbols from the transmit processor 464 may be precoded by a TX MIMO processor 466 if applicable, further processed by the demodulators in transceivers 454a through 454r (e.g., for SC-FDM, etc. ) , and transmitted to the base station 110.
  • data e.g., for the physical uplink shared channel (PUSCH)
  • control information e.g., for the physical uplink control channel (PUCCH) from the controller/processor 480.
  • the transmit processor 464 may also generate reference symbols for a reference signal (e.g., for the
  • the uplink signals from the UE 120 may be received by the antennas 434, processed by the modulators 432, detected by a MIMO detector 436 if applicable, and further processed by a receive processor 438 to obtain decoded data and control information sent by the UE 120.
  • the receive processor 438 may provide the decoded data to a data sink 439 and the decoded control information to the controller/processor 440.
  • the controllers/processors 440 and 480 may direct the operation at the base station 110 and the UE 120, respectively.
  • the processor 440 and/or other processors and modules at the BS 110 may perform or direct the execution of processes for the techniques described herein.
  • the memories 442 and 482 may store data and program codes for BS 110 and UE 120, respectively.
  • a scheduler 444 may schedule UEs for data transmission on the downlink and/or uplink.
  • FIG. 5 illustrates a diagram 500 showing examples for implementing a communications protocol stack, according to aspects of the present disclosure.
  • the illustrated communications protocol stacks may be implemented by devices operating in a wireless communication system, such as a 5G system (e.g., a system that supports uplink-based mobility) .
  • Diagram 500 illustrates a communications protocol stack including a Radio Resource Control (RRC) layer 510, a Packet Data Convergence Protocol (PDCP) layer 515, a Radio Link Control (RLC) layer 520, a Medium Access Control (MAC) layer 525, and a Physical (PHY) layer 530.
  • RRC Radio Resource Control
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Medium Access Control
  • PHY Physical
  • the layers of a protocol stack may be implemented as separate modules of software, portions of a processor or ASIC, portions of non-collocated devices connected by a communications link, or various combinations thereof. Collocated and non-collocated implementations may be used, for example, in a protocol stack for a network access device (e.g., ANs, CUs, and/or DUs) or a UE.
  • a network access device e.g., ANs, CUs, and/or DUs
  • a first option 505-a shows a split implementation of a protocol stack, in which implementation of the protocol stack is split between a centralized network access device (e.g., an ANC 202 in FIG. 2) and distributed network access device (e.g., DU 208 in FIG. 2) .
  • a centralized network access device e.g., an ANC 202 in FIG. 2
  • distributed network access device e.g., DU 208 in FIG. 2
  • an RRC layer 510 and a PDCP layer 515 may be implemented by the central unit
  • an RLC layer 520, a MAC layer 525, and a PHY layer 530 may be implemented by the DU.
  • the CU and the DU may be collocated or non-collocated.
  • the first option 505-a may be useful in a macro cell, micro cell, or pico cell deployment.
  • a second option 505-b shows a unified implementation of a protocol stack, in which the protocol stack is implemented in a single network access device.
  • RRC layer 510, PDCP layer 515, RLC layer 520, MAC layer 525, and PHY layer 530 may each be implemented by the AN.
  • the second option 505-b may be useful in, for example, a femto cell deployment.
  • a UE may implement an entire protocol stack as shown in 505-c (e.g., the RRC layer 510, the PDCP layer 515, the RLC layer 520, the MAC layer 525, and the PHY layer 530) .
  • the basic transmission time interval (TTI) or packet duration is the 1 ms subframe.
  • a subframe is still 1 ms, but the basic TTI is referred to as a slot.
  • a subframe contains a variable number of slots (e.g., 1, 2, 4, 8, 16, ...slots) depending on the subcarrier spacing.
  • the NR RB is 12 consecutive frequency subcarriers.
  • NR may support a base subcarrier spacing of 15 KHz and other subcarrier spacing may be defined with respect to the base subcarrier spacing, for example, 30 kHz, 60 kHz, 120 kHz, 240 kHz, etc.
  • the symbol and slot lengths scale with the subcarrier spacing.
  • the CP length also depends on the subcarrier spacing.
  • FIG. 6 is a diagram showing an example of a frame format 600 for NR.
  • the transmission timeline for each of the downlink and uplink may be partitioned into units of radio frames.
  • Each radio frame may have a predetermined duration (e.g., 10 ms) and may be partitioned into 10 subframes, each of 1 ms, with indices of 0 through 9.
  • Each subframe may include a variable number of slots depending on the subcarrier spacing.
  • Each slot may include a variable number of symbol periods (e.g., 7 or 14 symbols) depending on the subcarrier spacing.
  • the symbol periods in each slot may be assigned indices.
  • a mini-slot is a subslot structure (e.g., 2, 3, or 4 symbols) .
  • Each symbol in a slot may indicate a link direction (e.g., DL, UL, or flexible) for data transmission and the link direction for each subframe may be dynamically switched.
  • the link directions may be based on the slot format.
  • Each slot may include DL/UL data as well as DL/UL control information.
  • a synchronization signal (SS) block is transmitted.
  • the SS block includes a PSS, a SSS, and a two symbol PBCH.
  • the SS block can be transmitted in a fixed slot location, such as the symbols 0-3 as shown in FIG. 6.
  • the PSS and SSS may be used by UEs for cell search and acquisition.
  • the PSS may provide half-frame timing, the SS may provide the CP length and frame timing.
  • the PSS and SSS may provide the cell identity.
  • the PBCH carries some basic system information, such as downlink system bandwidth, timing information within radio frame, SS burst set periodicity, system frame number, etc.
  • the SS blocks may be organized into SS bursts to support beam sweeping. Further system information such as, remaining minimum system information (RMSI) , system information blocks (SIBs) , other system information (OSI) can be transmitted on a physical downlink shared channel (PDSCH) in certain subframes.
  • RMSI remaining minimum
  • two or more subordinate entities may communicate with each other using sidelink signals.
  • Real-world applications of such sidelink communications may include public safety, proximity services, UE-to-network relaying, vehicle-to-vehicle (V2V) communications, Internet of Everything (IoE) communications, IoT communications, mission-critical mesh, and/or various other suitable applications.
  • a sidelink signal may refer to a signal communicated from one subordinate entity (e.g., UE1) to another subordinate entity (e.g., UE2) without relaying that communication through the scheduling entity (e.g., UE or BS) , even though the scheduling entity may be utilized for scheduling and/or control purposes.
  • the sidelink signals may be communicated using a licensed spectrum (unlike wireless local area networks, which typically use an unlicensed spectrum) .
  • a UE may operate in various radio resource configurations, including a configuration associated with transmitting pilots using a dedicated set of resources (e.g., a radio resource control (RRC) dedicated state, etc. ) or a configuration associated with transmitting pilots using a common set of resources (e.g., an RRC common state, etc. ) .
  • RRC radio resource control
  • the UE may select a dedicated set of resources for transmitting a pilot signal to a network.
  • the UE may select a common set of resources for transmitting a pilot signal to the network.
  • a pilot signal transmitted by the UE may be received by one or more network access devices, such as an AN, or a DU, or portions thereof.
  • Each receiving network access device may be configured to receive and measure pilot signals transmitted on the common set of resources, and also receive and measure pilot signals transmitted on dedicated sets of resources allocated to the UEs for which the network access device is a member of a monitoring set of network access devices for the UE.
  • One or more of the receiving network access devices, or a CU to which receiving network access device (s) transmit the measurements of the pilot signals may use the measurements to identify serving cells for the UEs, or to initiate a change of serving cell for one or more of the UEs.
  • an atmospheric duct is a horizontal layer in the lower atmosphere, in which vertical refractive index gradients are such that radio signals (and light rays) are guided or ducted along the length of the duct.
  • the radio signals in the ducts therefore, tend to follow the curvature of the Earth. They also experience less attenuation in the ducts than they would if the ducts were not present.
  • an atmospheric duct will cause long-distance downlink (DL) signals of base stations to travel through the atmosphere with a long transmission delay but with a very low attenuation, thereby, affecting the wireless communication systems performance. Since the base stations in the above mentioned systems are supposed to transmit in certain time periods and to receive uplink signals from user equipments (UEs) in other periods, it is possible that the signals from a base station travelling through an atmospheric duct will reach another base station when this other base station is supposed to receive uplink signals from the UEs.
  • UEs user equipments
  • this other BS may experience remote interference caused by a base station (e.g., known as an aggressor BS) that is located very far away (e.g., 100-300kms away) .
  • a base station e.g., known as an aggressor BS
  • An over the air (OTA) framework has been defined to help reduce or eliminate the interference caused by aggressors BSs.
  • OTA over the air
  • a victim BS experiences remote interference, it initiates transmitting a victim reference signal (RS) to one or more aggressor BSs to notify them of the interference.
  • RS victim reference signal
  • detection of the victim RS by an aggressor BS indicates the victim transmitting the victim RS is experiencing remote interference.
  • FIG. 7 illustrates resources used for transmitting victim RS 710 (shown as RS-1) by a victim BS.
  • an aggressor BS receives the victim RS, it is configured to initiate transmitting an aggressor RS to the victim RS.
  • FIG. 7 also illustrates resources used for transmitting aggressor RS 720 (shown as RS-2) by an aggressor BS and resources corresponding to back-off symbols 722.
  • An aggressor RS is transmitted to indicate to the victim BS that the victim RS has been received.
  • the aggressor BS In response to receiving the victim RS, the aggressor BS also initiates remote interference mitigation by, for example, estimating the distance between itself and determining to mute (silence/refrain from transmitting) its downlink transmission during a number of symbols, based on the estimated distance.
  • the muted or nulled symbols which may be referred to as back-off symbols (e.g., back-off symbols 722) , help reduce the remote interference caused by the aggressor BS’s downlink transmissions.
  • back-off symbols e.g., back-off symbols 722
  • FIG. 7 illustrates a portion 740 of a downlink subframe (e.g., referred to as an adjusted downlink subframe) that does not include back-off symbols 722.
  • the victim BS continues to transmit the victim RS to the aggressor BS until it does not receive any aggressor RSs any more or when the victim BS does not detect any interference. If the victim BS continues to receive aggressor RSs and also continues to detect interference, it keeps transmitting the victim RS to the aggressor BS. In response, every time, aggressor BS receives another victim RS, it mutes its transmission during a larger number of symbols.
  • FIG. 8a illustrates RS transmissions between a victim BS 802 (Victim BS) and a first aggressor BS 804 (Aggressor 1) , which are at a distance D1 from each other.
  • the Victim BS upon detecting interference, the Victim BS transmits victim RS 810.
  • Aggressor 1 transmits aggressor RS 820 while also muting its transmissions during a certain number of symbols, referred to as back-off symbols.
  • back-off symbols As described above, the greater the distance between the victim BS and Aggressor 1, the larger the number of back-off symbols.
  • Aggressor 1 In response to continuing to receive victim RS 810, Aggressor 1 continues to transmit aggressor RS 820 to Victim BS and continues to mute its downlink transmission during a larger number of symbols. At some point, Aggressor 1 determines that interference no longer exists (based on the latest victim RS 810 it has received) . As such, Aggressor 1 stops transmitting aggressor RS 820 but continues to mute its downlink transmissions, during a certain number of symbols (N backoff-Agg1 ) , shown as back-off symbols 822.
  • N backoff-Agg1 a certain number of symbols
  • FIG. 8b illustrates that if an aggressor BS is located as a distance that is shorter than D1, the number of back-off symbols that it would need to use to eliminate the interference it is causing for the victim BS is fewer.
  • FIG. 8b shows aggressor BS 806 (Aggressor 2) responding to the transmission of victim RS 810 by transmitting aggressor RS 830 and muting its transmission during a certain number of symbols.
  • Aggressor 2 continues to transmit aggressor RS 830 to Victim BS and continues to mute its downlink transmission during a larger number of symbols.
  • Aggressor 2 determines that interference no longer exists (based on the latest victim RS 810 it has received) .
  • Aggressor 2 stops transmitting aggressor RS 830 but continues to mute its downlink transmissions, during a certain number of symbols (N backoff-Agg2 ) , shown as back-off symbols 832.
  • N backoff-Agg2 a certain number of symbols
  • the number of back-off symbols 822 is greater than the number of back-off symbols 832 (i.e., N backoff-Agg1 > N backoff-Agg2 ) .
  • the current framework presents a number of different challenges.
  • the Victim BS may use a long time to tune the victim RSs, for example, so that they may be properly received by the Aggressor BS.
  • the Victim BS may need to tune the victim RS’s transmission (Tx) power, occupied resources (e.g., time, frequency, spatial/precoding vector, etc. ) , and a number of BSs transmitting the victim RSs, all of which takes a long time.
  • Tx transmission
  • occupied resources e.g., time, frequency, spatial/precoding vector, etc.
  • the Aggressor BS may take a long time blindly searching for the victim RSs in addition to tuning the responsive aggressor RSs (e.g., using a similar procedure as the victim RSs) .
  • transmitting and receiving the victim RSs and aggressor RSs may consume an unnecessarily large amount of time and power resources at each of the Victim BS and Aggressor BS, leading to a drop in system performance.
  • aspects of the present disclosure propose techniques for reducing the amount of resources spent sending and searching for victim/aggressor RSs.
  • techniques propose sending historical victim/aggressor RS configuration information (e.g., feedback) to a central controller of the wireless network.
  • the central controller may transmit configuration information for transmitting/monitoring for RSs to the victim-aggressor pair.
  • the Victim BS may use the configuration information to tune the transmission of victim RSs and for monitoring for aggressor RSs received in response to the victim RSs.
  • the Aggressor BS may use the configuration information when monitoring for victim RSs and when tuning the aggressor RSs for transmission.
  • FIG. 9 illustrates example operations 900 for wireless communications in a network by a central controller, for example, for mitigating inter-cell interference, according to aspects presented herein.
  • Operations 900 begin at 902 by determining a first configuration for a first victim-aggressor pair including a first victim base station (BS) and a first aggressor base station (BS) to use to mitigate interference, wherein the first configuration indicates time and frequency resources for transmission of victim reference signals (RSs) by the first victim BS to indicate the presence of interference and for transmission of aggressor reference signals (RSs) by the first aggressor BS to indicate detection of victim RSs, wherein the first configuration is based at least in part on feedback from the first victim-aggressor pair.
  • RSs victim reference signals
  • RSs aggressor reference signals
  • the central controller transmits the first configuration to the first victim-aggressor pair.
  • FIG. 10 illustrates example operations 1000 for wireless communications in a network by a victim BS, for example, for mitigating inter-cell interference, according to aspects presented herein.
  • Operations 1000 begin at 1002 by detecting interference in one or more transmissions caused by a first aggressor BSs.
  • the victim BS transmits an interference report, indicating the detected interference, to a central controller (CC) .
  • CC central controller
  • the Victim BS receives, in response to the interference report, a first configuration for a victim-aggressor pair including the first victim BS and the first aggressor BS to use to mitigate the detected interference, wherein the first configuration indicates time and frequency resources for transmission of victim reference signals (RSs) by the first victim BS to indicate the presence of interference and for transmission of aggressor reference signals (RSs) by the first aggressor BS to indicate detection of victim RSs, wherein the first configuration is based at least in part on feedback from the first victim-aggressor pair.
  • RSs victim reference signals
  • RSs aggressor reference signals
  • the Victim BS transmits one or more victim RSs according to the first configuration upon detecting the interference.
  • the Victim BS receives one or more aggressor RSs, in response to the first victim RS, based on the first configuration. Additionally, while not shown in FIG. 10, based on the reception of the one or more aggressor RSs, the Victim RS may perform an interference mitigation procedure with the Aggressor BS to mitigate the detected interference, for example, using techniques described above.
  • FIG. 11 illustrates example operations 1100 for wireless communications in a network by an Aggressor BS, for example, for mitigating inter-cell interference, according to aspects presented herein.
  • Operations 1100 begin at 1102 by receiving a first configuration for a victim-aggressor pair including the first victim BS and the first aggressor BS to use to mitigate the detected interference, wherein the first configuration indicates time and frequency resources for transmission of victim reference signals (RSs) by the first victim BS to indicate the presence of interference and for transmission of aggressor reference signals (RSs) by the first aggressor BS to indicate detection of victim RSs, wherein the first configuration is based at least in part on feedback from the first victim-aggressor pair.
  • RSs victim reference signals
  • RSs aggressor reference signals
  • the Aggressor BS monitors for victim RSs according to the first configuration.
  • the Aggressor BS transmits, in response to detecting a victim RS, one or more aggressor RS according to the first configuration. Additionally, while not shown in FIG. 11, based on the reception of the one or more victim RSs, the Aggressor RS may perform an interference mitigation procedure with the Victim BS to mitigate the interference detected at the victim BS, for example, using techniques described above.
  • aspects of the present disclosure present techniques for mitigating inter-cell interference, for example, by using historical RS interference mitigation configuration information (e.g., supplied by a central controller) to guide future interference mitigation procedures at victim/aggressor BSs. These techniques will be described in greater detail below with reference to FIG. 12.
  • FIG. 12 is a call-flow diagram illustrating a centrally-control inter-cell interference mitigation method, according to aspects presented herein.
  • the victim BS may detect interference (e.g., interference over thermal (IoT) ) in one or more transmissions due to one or more Aggressor BSs (e.g., the victim BS and Aggressor BS may be known as a victim-aggressor pair) .
  • the interference may be caused by atmospheric ducting as described above.
  • the victim BS may transmit an interference report to the central controller indicating the detected interference.
  • the interference report may indicate the Aggressor BS’s ID (e.g., BS group) in order to help the central controller assign a correct RS configuration.
  • the central controller may determine a first configuration for the victim-aggressor pair (e.g., including the victim BS and the aggressor BS) to use to mitigate interference.
  • the first configuration may indicate time and frequency resources for transmission of victim RSs by the victim BS to indicate the presence of interference and for transmission of aggressor RSs by the aggressor BS to indicate detection of victim RSs.
  • the first configuration may be based, at least in part, on feedback from the first victim-aggressor pair.
  • the feedback may comprise configuration information for the victim RSs, received from the victim BS, based on previous tuning (as described above) of transmission of victim RSs by the victim BS.
  • the feedback may also comprise configuration information, received from the aggressor BS, based on detection of the victim RSs from the victim BS and tuning of aggressor RSs transmitted in response to the victim RSs.
  • the feedback may also comprise BS location information, downlink (DL) /uplink (UL) configuration information, etc.
  • the first configuration may include at least one of a transmission power corresponding to the victim RSs, a transmission pattern corresponding to the victim RSs, a number of victim BSs that transmit the victim RSs, a transmission frequency corresponding to the victim RSs, or a transmission spatial vector corresponding to the victim RSs. Additionally, the first configuration may include at least one of a transmission power corresponding to the aggressor RSs, a transmission pattern corresponding to the aggressor RSs, a number of aggressor BSs that transmit the aggressor RSs, a transmission frequency corresponding to aggressor RSs, or a transmission spatial vector corresponding to the aggressor RSs.
  • the central controller may transmit the first configuration to the victim BS (e.g., at step 3a) and to the aggressor BS (e.g., at step 3b) .
  • the victim BS and the aggressor BS may perform an interference mitigation procedure to mitigate interference experienced at the victim BS (e.g., due to the aggressor BS) .
  • the interference mitigation procedure may be performed in accordance with the techniques described above with reference to FIGs. 7 and 8, for example, taking into account the first configuration.
  • the victim BS may use the first configuration to more quickly tune the victim RSs for transmission and to more quickly monitor and receive the aggressor RSs in response to the victim RSs. That is, for example, the victim RS may use the first configuration (e.g., information indicating the aggressor RSs transmission power, frequency, time, RS sequence, spatial vector, etc. ) to properly tune its receiver to more quickly and accurately monitor for and receive the aggressor RSs.
  • the aggressor BS may use the first configuration to more quickly monitor for and receive the victim RSs, and also to tune the aggressor RSs for transmission.
  • the aggressor RS may use the first configuration (e.g., information indicating the victim RSs transmission power, frequency, time, RS sequence, spatial vector, etc. ) to properly tune its receiver to more quickly and accurately monitor for and receive the aggressor RSs.
  • the aggressor BS may also use the first configuration to properly tune the aggressor RSs in response to receiving the victim RSs.
  • the victim BS may, in some cases, transmit the same victim RS from one or more victim BS (e.g., of a same victim BS group, for example, victim group A (VA) ) making it more likely that aggressor BSs (e.g., of a same aggressor BS group, for example, aggressor group A (AA) ) will detect the victim RSs. That is, when multiple victim BSs transmit the same victim RS at the same time, the aggressor BS (s) may have a better chance at receiving the victim RSs due to the larger transmission power.
  • victim group A e.g., of a same victim BS group, for example, victim group A (VA)
  • aggressor BSs e.g., of a same aggressor BS group, for example, aggressor group A (AA)
  • victim BSs from the same victim BS group A may need to use different timing advances when transmitting the victim RSs, for example, which may be coordinated by a head BS of the victim BS group A. Additionally, in other cases, to make sure the aggressor BS receives the victim RSs, the victim BS may assign more resource units (e.g., physical resource blocks) to transmit the victim RSs and, in some cases, time domain repetition.
  • resource units e.g., physical resource blocks
  • the aggressor BSs in the aggressor BS group A may be located far away from each other (e.g., tens of kilometers) , the victim RSs may have a large timing difference at the receives of the aggressor BSs.
  • the aggressor BSs may use a long detection window and a rake receiver for different fingers.
  • the victim BS may determine a victim RS transmission pattern corresponding to the victim RSs it transmitted.
  • the victim RS transmission pattern may include information such as transmission frequency corresponding to the victim RSs (e.g., Tx_frequency_VA) , a transmission time corresponding to the victim RSs (e.g., Tx_time_VA) , a transmission spatial vector corresponding to the victim RSs (e.g., Tx_spatial_vector_VA) , and/or a transmission sequence corresponding to the victim RSs (e.g., Tx_sequence_VA) .
  • the victim BS may detect an aggressor RS reception pattern corresponding to the aggressor RSs detected in response to the victim RSs.
  • the aggressor RS reception pattern may include information such as reception frequency corresponding to the aggressor RSs received at the victim BS (e.g., Rx_frequency_AA) , an estimated reception time corresponding to the aggressor RSs received at the victim BS (e.g., Rx_time_AA) , a reception spatial vector corresponding to the aggressor RSs received at the victim BS (e.g., Rx_spatial_vector_AA) , and/or a reception sequence corresponding to the aggressor RSs received at the victim BS (e.g., Rx_sequence_AA) .
  • the estimated reception time may be determined based on an actual reception time of the one or more aggressor RSs at the victim BS minus an estimated propagation delay corresponding to the one or more aggressor RSs.
  • the victim BS may report the victim RS transmission pattern and the aggressor BS reception pattern to the central controller as feedback, for example, as illustrated at step 5 in FIG. 12.
  • the aggressor BS may determine an aggressor RS transmission pattern corresponding to the aggressor RSs it transmitted.
  • the aggressor RS transmission pattern may include information such as transmission frequency corresponding to the aggressor RSs (e.g., Tx_frequency_AA) , a transmission time corresponding to the aggressor RSs (e.g., Tx_time_AA) , a transmission spatial vector corresponding to the aggressor RSs (e.g., Tx_spatial_vector_AA) , and/or a transmission sequence corresponding to the aggressor RSs (e.g., Tx_sequence_AA) .
  • the aggressor BS may detect a victim RS reception pattern corresponding to the victim RSs detected from the victim RSs.
  • the victim RS reception pattern may include information such a reception frequency corresponding to the victim RSs received at the first aggressor BS (e.g., Rx_frequency_VA) , an estimated reception time corresponding to the victim RSs received at the first aggressor BS (e.g., Rx_time_VA) , a reception spatial vector corresponding to the victim RSs received at the first aggressor BS (e.g., Rx_spatial_vector_VA) , or a reception sequence corresponding to the victim RSs received at the first aggressor BS (e.g., Rx_sequence_VA) .
  • the estimated reception time may be determined based on an actual reception time of the one or more victim RSs at the aggressor BS minus an estimated propagation delay corresponding to the one or more victim RSs.
  • the aggressor BS may report the victim RS pattern and the aggressor BS pattern to the central controller as feedback, for example, as illustrated at step 5 in FIG. 12.
  • the central controller may determine one or more victim-aggressor BS pairs by pairing transmission and reception configurations corresponding to the received feedback, for example, based one or more matching functions.
  • the matching function for the victim RS (V-RS) transmission/reception patterns may be equal to:
  • V-RS a*
  • the matching function for the aggressor RS (A-RS) transmission/reception patterns (e.g., received in the feedback at the central controller) may be equal to:
  • P (A-RS) a*
  • the central controller may then apply an overall matching function to determine a victim-aggressor pair.
  • P is less than or equal to a matching function threshold
  • the central controller may pair the victim BS and the aggressor BS corresponding to the feedback used in the matching function.
  • the central controller may compare a reported victim BS ID and an aggressor BS ID.
  • the central controller may transmit the RS configuration information to the victim BS and the aggressor BS to aid them in performing the interference mitigation procedure.
  • the methods disclosed herein comprise one or more steps or actions for achieving the methods.
  • the method steps and/or actions may be interchanged with one another without departing from the scope of the claims.
  • the order and/or use of specific steps and/or actions may be modified without departing from the scope of the claims.
  • a phrase referring to “at least one of” a list of items refers to any combination of those items, including single members.
  • “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) .
  • determining encompasses a wide variety of actions. For example, “determining” may include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, a database or another data structure) , ascertaining and the like. Also, “determining” may include receiving (e.g., receiving information) , accessing (e.g., accessing data in a memory) and the like. Also, “determining” may include resolving, selecting, choosing, establishing and the like.
  • the various operations of methods described above may be performed by any suitable means capable of performing the corresponding functions.
  • the means may include various hardware and/or software component (s) and/or module (s) , including, but not limited to a circuit, an application specific integrated circuit (ASIC) , or processor.
  • ASIC application specific integrated circuit
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • PLD programmable logic device
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • an example hardware configuration may comprise a processing system in a wireless node.
  • the processing system may be implemented with a bus architecture.
  • the bus may include any number of interconnecting buses and bridges depending on the specific application of the processing system and the overall design constraints.
  • the bus may link together various circuits including a processor, machine-readable media, and a bus interface.
  • the bus interface may be used to connect a network adapter, among other things, to the processing system via the bus.
  • the network adapter may be used to implement the signal processing functions of the PHY layer.
  • a user interface e.g., keypad, display, mouse, joystick, etc.
  • a user interface e.g., keypad, display, mouse, joystick, etc.
  • the bus may also link various other circuits such as timing sources, peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further.
  • the processor may be implemented with one or more general-purpose and/or special-purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuitry that can execute software. Those skilled in the art will recognize how best to implement the described functionality for the processing system depending on the particular application and the overall design constraints imposed on the overall system.
  • the functions may be stored or transmitted over as one or more instructions or code on a computer readable medium.
  • Software shall be construed broadly to mean instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • Computer-readable media include both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • the processor may be responsible for managing the bus and general processing, including the execution of software modules stored on the machine-readable storage media.
  • a computer-readable storage medium may be coupled to a processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor.
  • the machine-readable media may include a transmission line, a carrier wave modulated by data, and/or a computer readable storage medium with instructions stored thereon separate from the wireless node, all of which may be accessed by the processor through the bus interface.
  • the machine-readable media, or any portion thereof may be integrated into the processor, such as the case may be with cache and/or general register files.
  • machine-readable storage media may include, by way of example, RAM (Random Access Memory) , flash memory, ROM (Read Only Memory) , PROM (Programmable Read-Only Memory) , EPROM (Erasable Programmable Read-Only Memory) , EEPROM (Electrically Erasable Programmable Read-Only Memory) , registers, magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof.
  • RAM Random Access Memory
  • ROM Read Only Memory
  • PROM Programmable Read-Only Memory
  • EPROM Erasable Programmable Read-Only Memory
  • EEPROM Electrical Erasable Programmable Read-Only Memory
  • registers magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof.
  • the machine-readable media may be embodied in a computer-program product.
  • a software module may comprise a single instruction, or many instructions, and may be distributed over several different code segments, among different programs, and across multiple storage media.
  • the computer-readable media may comprise a number of software modules.
  • the software modules include instructions that, when executed by an apparatus such as a processor, cause the processing system to perform various functions.
  • the software modules may include a transmission module and a receiving module. Each software module may reside in a single storage device or be distributed across multiple storage devices.
  • a software module may be loaded into RAM from a hard drive when a triggering event occurs.
  • the processor may load some of the instructions into cache to increase access speed.
  • One or more cache lines may then be loaded into a general register file for execution by the processor.
  • any connection is properly termed a computer-readable medium.
  • the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared (IR) , radio, and microwave
  • the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium.
  • Disk and disc include compact disc (CD) , laser disc, optical disc, digital versatile disc (DVD) , floppy disk, and disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers.
  • computer-readable media may comprise non-transitory computer-readable media (e.g., tangible media) .
  • computer-readable media may comprise transitory computer-readable media (e.g., a signal) . Combinations of the above should also be included within the scope of computer-readable media.
  • certain aspects may comprise a computer program product for performing the operations presented herein.
  • a computer program product may comprise a computer-readable medium having instructions stored (and/or encoded) thereon, the instructions being executable by one or more processors to perform the operations (e.g., operations described in FIGs. 9-11) described herein.
  • modules and/or other appropriate means for performing the methods and techniques described herein can be downloaded and/or otherwise obtained by a user terminal and/or base station as applicable.
  • a user terminal and/or base station can be coupled to a server to facilitate the transfer of means for performing the methods described herein.
  • various methods described herein can be provided via storage means (e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or floppy disk, etc. ) , such that a user terminal and/or base station can obtain the various methods upon coupling or providing the storage means to the device.
  • storage means e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or floppy disk, etc.
  • CD compact disc
  • floppy disk etc.
  • any other suitable technique for providing the methods and techniques described herein to a device can be utilized.

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

Abstract

Certains aspects de la présente invention concernent des techniques d'atténuation de brouillage. Un procédé donné à titre d'exemple consiste globalement à : déterminer une première configuration d'une première paire victime-agresseuse, comprenant une première station de base (BS) victime et une première station de base (BS) agresseuse, devant être utilisée pour atténuer un brouillage, la première configuration indiquant des ressources temps-fréquence pour la transmission de signaux de référence (RS) de victime par la première BS victime afin d'indiquer la présence d'un brouillage, et pour la transmission de signaux de référence (RS) d'agresseuse par la première BS agresseuse afin d'indiquer la détection de RS de victime, la première configuration étant basée au moins en partie sur une rétroaction provenant de la première paire victime-agresseuse ; transmettre la première configuration à la première paire victime-aggresseuse.
PCT/CN2018/107175 2018-09-24 2018-09-24 Atténuation de brouillage intercellulaire contrôlée de manière centralisée WO2020061721A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023168704A1 (fr) * 2022-03-11 2023-09-14 Zte Corporation Systèmes et procédés de détermination de ressource de mesure pour mesurer une interférence entre des nœuds de réseau
WO2023209615A1 (fr) * 2022-04-27 2023-11-02 Lenovo (Singapore) Pte. Ltd. Mesure des interférences par un répéteur commandé par le réseau

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