WO2021022395A1 - Conception de bloc de signal de synchronisation de partage de spectre dynamique (dss) et signal de référence de démodulation (dmrs) supplémentaire - Google Patents

Conception de bloc de signal de synchronisation de partage de spectre dynamique (dss) et signal de référence de démodulation (dmrs) supplémentaire Download PDF

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WO2021022395A1
WO2021022395A1 PCT/CN2019/098992 CN2019098992W WO2021022395A1 WO 2021022395 A1 WO2021022395 A1 WO 2021022395A1 CN 2019098992 W CN2019098992 W CN 2019098992W WO 2021022395 A1 WO2021022395 A1 WO 2021022395A1
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ssb
rat
carrying
symbols
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PCT/CN2019/098992
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English (en)
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Yiqing Cao
Peter Gaal
Bin Han
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Qualcomm Incorporated
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Priority to PCT/CN2019/098992 priority Critical patent/WO2021022395A1/fr
Publication of WO2021022395A1 publication Critical patent/WO2021022395A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
    • 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
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • 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
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0006—Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio

Definitions

  • aspects of the disclosure relate generally to wireless communications and the like.
  • Wireless communication systems have developed through various generations, including a first-generation analog wireless phone service (1G) , a second-generation (2G) digital wireless phone service (including interim 2.5G networks) , a third-generation (3G) high speed data, Internet-capable wireless service, and a fourth-generation (4G) service (e.g., Long-Term Evolution (LTE) , WiMax) .
  • 1G first-generation analog wireless phone service
  • 2G second-generation
  • 3G third-generation
  • 4G fourth-generation
  • LTE Long-Term Evolution
  • WiMax Worldwide Interoperability for Microwave Access
  • a fifth generation (5G) mobile standard calls for higher data transfer speeds, greater numbers of connections, and better coverage, among other improvements.
  • the 5G standard also referred to as “New Radio” or “NR”
  • NR Next Generation Mobile Networks Alliance
  • NR Next Generation Mobile Networks Alliance
  • 5G mobile communications should be significantly enhanced compared to the current 4G /LTE standard.
  • signaling efficiencies should be enhanced and latency should be substantially reduced compared to current standards.
  • a method of wireless communication includes receiving from a transmission point or transmitting to a UE, over a wireless communication medium shared by a first RAT and a second RAT, a downlink subframe comprising at least four symbols carrying a CRS for the first RAT and no more than three consecutive symbols carrying an SSB for the second RAT, wherein there are no more than three symbols between each of the at least four symbols carrying the CRS.
  • a method of wireless communication includes receiving from a transmission point or transmitting to a UE, over a wireless communication medium shared by a first RAT and a second RAT, a downlink subframe comprising at least four symbols carrying a CRS for the first RAT and four consecutive symbols carrying an SSB for the second RAT, wherein there are no more than three symbols between each of the at least four symbols carrying the CRS, and wherein a last symbol of the four consecutive symbols carrying the SSB is rate matched around the at least four symbols carrying the CRS for the first RAT.
  • FIG. 1 illustrates an exemplary wireless communications system, according to various aspects of the disclosure.
  • FIGS. 2A and 2B illustrate example wireless network structures, according to various aspects of the disclosure.
  • FIG. 3 illustrates an exemplary base station in communication with an exemplary UE in a wireless network, according to aspects of the disclosure.
  • FIG. 4 is a diagram illustrating an example of a frame structure for use in a wireless telecommunications system according to an aspect of the disclosure.
  • FIG. 5 is a diagram illustrating an example of a synchronization signal block (SSB) according to an aspect of the disclosure.
  • SSB synchronization signal block
  • FIGS. 6A to 6B illustrate cell-specific reference signal (CRS) patterns in LTE, according to aspects of the disclosure.
  • FIG. 6C illustrates resource grids for LTE CRS patterns, according to aspects of the disclosure.
  • FIG. 7 illustrates an exemplary multimedia broadcast single frequency network (MBSFN) subframe, according to aspects of the disclosure.
  • MMSFN multimedia broadcast single frequency network
  • FIG. 8 illustrates examples of how an SSB can be reconfigured to span two or three symbols instead of four, according to aspects of the disclosure.
  • FIG. 9 illustrates alternative locations for a second additional DMRS, according to aspects of the disclosure.
  • FIGS. 10 to 12 illustrate exemplary methods of wireless communication, according to aspects of the disclosure.
  • sequences of actions to be performed by, for example, elements of a computing device. It will be recognized that various actions described herein can be performed by specific circuits (e.g., application specific integrated circuits (ASICs) ) , by program instructions being executed by one or more processors, or by a combination of both. Additionally, the sequence (s) of actions described herein can be considered to be embodied entirely within any form of non-transitory computer-readable storage medium having stored therein a corresponding set of computer instructions that, upon execution, would cause or instruct an associated processor of a device to perform the functionality described herein.
  • ASICs application specific integrated circuits
  • a UE may be any wireless communication device (e.g., a mobile phone, router, tablet computer, laptop computer, tracking device, wearable (e.g., smartwatch, glasses, augmented reality (AR) /virtual reality (VR) headset, etc. ) , vehicle (e.g., automobile, motorcycle, bicycle, etc. ) , Internet of Things (IoT) device, etc. ) used by a user to communicate over a wireless communications network.
  • wireless communication device e.g., a mobile phone, router, tablet computer, laptop computer, tracking device, wearable (e.g., smartwatch, glasses, augmented reality (AR) /virtual reality (VR) headset, etc. )
  • vehicle e.g., automobile, motorcycle, bicycle, etc.
  • IoT Internet of Things
  • a UE may be mobile or may (e.g., at certain times) be stationary, and may communicate with a Radio Access Network (RAN) .
  • RAN Radio Access Network
  • the term “UE” may be referred to interchangeably as an “access terminal” or “AT, ” a “client device, ” a “wireless device, ” a “subscriber device, ” a “subscriber terminal, ” a “subscriber station, ” a “user terminal” or UT, a “mobile terminal, ” a “mobile station, ” or variations thereof.
  • AT access terminal
  • client device e.g., a “wireless device
  • UEs can communicate with a core network via a RAN, and through the core network the UEs
  • a base station may operate according to one of several RATs in communication with UEs depending on the network in which it is deployed, and may be alternatively referred to as an access point (AP) , a network node, a NodeB, an evolved NodeB (eNB) , a New Radio (NR) Node B (also referred to as a gNB or gNodeB) , etc.
  • AP access point
  • eNB evolved NodeB
  • NR New Radio
  • a base station may provide purely edge node signaling functions while in other systems it may provide additional control and/or network management functions.
  • a communication link through which UEs can send signals to a base station is called an uplink (UL) channel (e.g., a reverse traffic channel, a reverse control channel, an access channel, etc. ) .
  • UL uplink
  • a communication link through which the base station can send signals to UEs is called a downlink (DL) or forward link channel (e.g., a paging channel, a control channel, a broadcast channel, a forward traffic channel, etc. ) .
  • DL downlink
  • forward link channel e.g., a paging channel, a control channel, a broadcast channel, a forward traffic channel, etc.
  • TCH traffic channel
  • base station may refer to a single physical transmission point or to multiple physical transmission points that may or may not be co-located.
  • the physical transmission point may be an antenna of the base station corresponding to a cell of the base station.
  • the physical transmission points may be an array of antennas (e.g., as in a multiple-input multiple-output (MIMO) system or where the base station employs beamforming) of the base station.
  • MIMO multiple-input multiple-output
  • the physical transmission points may be a distributed antenna system (DAS) (anetwork of spatially separated antennas connected to a common source via a transport medium) or a remote radio head (RRH) (a remote base station connected to a serving base station) .
  • DAS distributed antenna system
  • RRH remote radio head
  • the non-co-located physical transmission points may be the serving base station receiving the measurement report from the UE and a neighbor base station whose reference RF signals the UE is measuring.
  • FIG. 1 illustrates an exemplary wireless communications system 100.
  • the wireless communications system 100 (which may also be referred to as a wireless wide area network (WWAN) ) may include various base stations 102 and various UEs 104.
  • the base stations 102 may include macro cell base stations (high power cellular base stations) and/or small cell base stations (low power cellular base stations) .
  • the macro cell base station may include eNBs where the wireless communications system 100 corresponds to an LTE network, or gNBs where the wireless communications system 100 corresponds to a 5G network, or a combination of both, and the small cell base stations may include femtocells, picocells, microcells, etc.
  • the base stations 102 may collectively form a RAN and interface with a core network 170 (e.g., an evolved packet core (EPC) or next generation core (NGC) ) through backhaul links 122, and through the core network 170 to one or more location servers 172.
  • a core network 170 e.g., an evolved packet core (EPC) or next generation core (NGC)
  • EPC evolved packet core
  • NTC next generation core
  • the base stations 102 may perform functions that relate to one or more of transferring user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity) , inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, RAN sharing, multimedia broadcast multicast service (MBMS) , subscriber and equipment trace, RAN information management (RIM) , paging, positioning, and delivery of warning messages.
  • the base stations 102 may communicate with each other directly or indirectly (e.g., through the EPC /NGC) over backhaul links 134, which may be wired or wireless.
  • different cells may be configured according to different protocol types (e.g., machine-type communication (MTC) , narrowband IoT (NB-IoT) , enhanced mobile broadband (eMBB) , or others) that may provide access for different types of UEs.
  • MTC machine-type communication
  • NB-IoT narrowband IoT
  • eMBB enhanced mobile broadband
  • the term “cell” may also refer to a geographic coverage area of a base station (e.g., a sector) , insofar as a carrier frequency can be detected and used for communication within some portion of geographic coverage areas 110.
  • the communication links 120 between the base stations 102 and the UEs 104 may include UL (also referred to as reverse link) transmissions from a UE 104 to a base station 102 and/or downlink (DL) (also referred to as forward link) transmissions from a base station 102 to a UE 104.
  • the communication links 120 may use MIMO antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity.
  • the communication links 120 may be through one or more carrier frequencies. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or less carriers may be allocated for DL than for UL) .
  • the wireless communications system 100 may further include a wireless local area network (WLAN) access point (AP) 150 in communication with WLAN stations (STAs) 152 via communication links 154 in an unlicensed frequency spectrum (e.g., 5 GHz) .
  • WLAN wireless local area network
  • AP access point
  • the WLAN STAs 152 and/or the WLAN AP 150 may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.
  • CCA clear channel assessment
  • the small cell base station 102' may operate in a licensed and/or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell base station 102' may employ LTE or 5G technology and use the same 5 GHz unlicensed frequency spectrum as used by the WLAN AP 150. The small cell base station 102', employing LTE /5G in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network. LTE in an unlicensed spectrum may be referred to as LTE-unlicensed (LTE-U) , licensed assisted access (LAA) , or MulteFire.
  • LTE-U LTE-unlicensed
  • LAA licensed assisted access
  • MulteFire MulteFire
  • the wireless communications system 100 may further include a millimeter wave (mmW) base station 180 that may operate in mmW frequencies and/or near mmW frequencies in communication with a UE 182.
  • Extremely high frequency (EHF) is part of the RF in the electromagnetic spectrum. EHF has a range of 30 GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters. Radio waves in this band may be referred to as a millimeter wave.
  • Near mmW may extend down to a frequency of 3 GHz with a wavelength of 100 millimeters.
  • the super high frequency (SHF) band extends between 3 GHz and 30 GHz, also referred to as centimeter wave.
  • the mmW base station 180 and the UE 182 may utilize beamforming (transmit and/or receive) over a mmW communication link 184 to compensate for the extremely high path loss and short range.
  • one or more base stations 102 may also transmit using mmW or near mmW and beamforming. Accordingly, it will be appreciated that the foregoing illustrations are merely examples and should not be construed to limit the various aspects disclosed herein.
  • Transmit beamforming is a technique for focusing an RF signal in a specific direction.
  • a network node e.g., a base station
  • transmit beamforming the network node determines where a given target device (e.g., a UE) is located (relative to the transmitting network node) and projects a stronger downlink RF signal in that specific direction, thereby providing a faster (in terms of data rate) and stronger RF signal for the receiving device (s) .
  • a network node can control the phase and relative amplitude of the RF signal at each of the one or more transmitters that are broadcasting the RF signal.
  • a network node may use an array of antennas (referred to as a “phased array” or an “antenna array” ) that creates a beam of RF waves that can be “steered” to point in different directions, without actually moving the antennas.
  • the RF current from the transmitter is fed to the individual antennas with the correct phase relationship so that the radio waves from the separate antennas add together to increase the radiation in a desired direction, while cancelling to suppress radiation in undesired directions.
  • the receiver uses a receive beam to amplify RF signals detected on a given channel. For example, the receiver can increase the gain setting and/or adjust the phase setting of an array of antennas in a particular direction to amplify (e.g., to increase the gain level of) the RF signals received from that direction.
  • a receiver is said to beamform in a certain direction, it means the beam gain in that direction is high relative to the beam gain along other directions, or the beam gain in that direction is the highest compared to the beam gain in that direction of all other receive beams available to the receiver.
  • RSRP reference signal received power
  • RSRQ reference signal received quality
  • SINR signal-to-interference-plus-noise ratio
  • the frequency spectrum in which wireless nodes is divided into multiple frequency ranges, FR1 (from 450 to 6000 MHz) , FR2 (from 24250 to 52600 MHz) , FR3 (above 52600 MHz) , and FR4 (between FR1 and FR2) .
  • FR1 from 450 to 6000 MHz
  • FR2 from 24250 to 52600 MHz
  • FR3 above 52600 MHz
  • FR4 between FR1 and FR2
  • one of the carrier frequencies is referred to as the “primary carrier” or “anchor carrier” or “primary serving cell” or “PCell, ” and the remaining carrier frequencies are referred to as “secondary carriers” or “secondary serving cells” or “SCells.
  • the anchor carrier is the carrier operating on the primary frequency (e.g., FR1) utilized by a UE 104/182 and the cell in which the UE 104/182 either performs the initial radio resource control (RRC) connection establishment procedure or initiates the RRC connection re-establishment procedure.
  • the primary carrier carries all common and UE-specific control channels.
  • a secondary carrier is a carrier operating on a second frequency (e.g., FR2) that may be configured once the RRC connection is established between the UE 104 and the anchor carrier and that may be used to provide additional radio resources.
  • the secondary carrier may contain only necessary signaling information and signals, for example, those that are UE-specific may not be present in the secondary carrier, since both primary uplink and downlink carriers are typically UE-specific. This means that different UEs 104/182 in a cell may have different downlink primary carriers. The same is true for the uplink primary carriers.
  • the network is able to change the primary carrier of any UE 104/182 at any time. This is done, for example, to balance the load on different carriers.
  • a “serving cell” (whether a PCell or an SCell) corresponds to a carrier frequency /component carrier over which some base station is communicating, the term “cell, ” “serving cell, ” “component carrier, ” “carrier frequency, ” and the like can be used interchangeably.
  • one of the frequencies utilized by the macro cell base stations 102 may be an anchor carrier (or “PCell” ) and other frequencies utilized by the macro cell base stations 102 and/or the mmW base station 180 may be secondary carriers ( “SCells” ) .
  • the simultaneous transmission and/or reception of multiple carriers enables the UE 104/182 to significantly increase its data transmission and/or reception rates. For example, two 20 MHz aggregated carriers in a multi-carrier system would theoretically lead to a two-fold increase in data rate (i.e., 40 MHz) , compared to that attained by a single 20 MHz carrier.
  • the wireless communications system 100 may further include one or more UEs, such as UE 190, that connects indirectly to one or more communication networks via one or more device-to-device (D2D) peer-to-peer (P2P) links.
  • D2D device-to-device
  • P2P peer-to-peer
  • UE 190 has a D2D P2P link 192 with one of the UEs 104 connected to one of the base stations 102 (e.g., through which UE 190 may indirectly obtain cellular connectivity) and a D2D P2P link 194 with WLAN STA 152 connected to the WLAN AP 150 (through which UE 190 may indirectly obtain WLAN-based Internet connectivity) .
  • the D2D P2P links 192 and 194 may be supported with any well-known D2D RAT, such as LTE Direct (LTE-D) , WiFi Direct (WiFi-D) , and so on.
  • the wireless communications system 100 may further include a UE 164 that may communicate with a macro cell base station 102 over a communication link 120 and/or the mmW base station 180 over a mmW communication link 184.
  • the macro cell base station 102 may support a PCell and one or more SCells for the UE 164 and the mmW base station 180 may support one or more SCells for the UE 164.
  • FIG. 2A illustrates an example wireless network structure 200.
  • an NGC 210 also referred to as a “5GC”
  • control plane functions 214 e.g., UE registration, authentication, network access, gateway selection, etc.
  • user plane functions 212 e.g., UE gateway function, access to data networks, IP routing, etc.
  • User plane interface (NG-U) 213 and control plane interface (NG-C) 215 connect the gNB 222 to the NGC 210 and specifically to the control plane functions 214 and user plane functions 212.
  • an eNB 224 may also be connected to the NGC 210 via NG-C 215 to the control plane functions 214 and NG-U 213 to user plane functions 212. Further, eNB 224 may directly communicate with gNB 222 via a backhaul connection 223. In some configurations, the New RAN 220 may only have one or more gNBs 222, while other configurations include one or more of both eNBs 224 and gNBs 222. Either gNB 222 or eNB 224 may communicate with UEs 204 (e.g., any of the UEs depicted in FIG. 1) .
  • FIG. 2B illustrates another example wireless network structure 250.
  • an NGC 260 (also referred to as a “5GC” ) can be viewed functionally as control plane functions, provided by an access and mobility management function (AMF) /user plane function (UPF) 264, and user plane functions, provided by a session management function (SMF) 262, which operate cooperatively to form the core network (i.e., NGC 260) .
  • AMF access and mobility management function
  • UPF user plane function
  • SMF session management function
  • User plane interface 263 and control plane interface 265 connect the eNB 224 to the NGC 260 and specifically to SMF 262 and AMF/UPF 264, respectively.
  • the functions of the AMF include registration management, connection management, reachability management, mobility management, lawful interception, transport for session management (SM) messages between the UE 204 and the SMF 262, transparent proxy services for routing SM messages, access authentication and access authorization, transport for short message service (SMS) messages between the UE 204 and the short message service function (SMSF) (not shown) , and security anchor functionality (SEAF) .
  • the AMF also interacts with the authentication server function (AUSF) (not shown) and the UE 204, and receives the intermediate key that was established as a result of the UE 204 authentication process.
  • AUSF authentication server function
  • the AMF retrieves the security material from the AUSF.
  • the functions of the AMF also include security context management (SCM) .
  • SCM receives a key from the SEAF that it uses to derive access-network specific keys.
  • the functionality of the AMF also includes location services management for regulatory services, transport for location services messages between the UE 204 and the location management function (LMF) 270 (which may correspond to location server 172) , as well as between the New RAN 220 and the LMF 270, evolved packet system (EPS) bearer identifier allocation for interworking with the EPS, and UE 204 mobility event notification.
  • LMF location management function
  • EPS evolved packet system
  • the AMF also supports functionalities for non-Third Generation Partnership Project (3GPP) access networks.
  • Functions of the UPF include acting as an anchor point for intra-/inter-RAT mobility (when applicable) , acting as an external protocol data unit (PDU) session point of interconnect to the data network (not shown) , providing packet routing and forwarding, packet inspection, user plane policy rule enforcement (e.g., gating, redirection, traffic steering) , lawful interception (user plane collection) , traffic usage reporting, quality of service (QoS) handling for the user plane (e.g., UL/DL rate enforcement, reflective QoS marking in the DL) , UL traffic verification (service data flow (SDF) to QoS flow mapping) , transport level packet marking in the UL and DL, DL packet buffering and DL data notification triggering, and sending and forwarding of one or more “end markers” to the source RAN node.
  • PDU protocol data unit
  • LMF 270 may be in communication with the NGC 260 to provide location assistance for UEs 204.
  • the LMF 270 can be implemented as a plurality of separate servers (e.g., physically separate servers, different software modules on a single server, different software modules spread across multiple physical servers, etc. ) , or alternately may each correspond to a single server.
  • the LMF 270 can be configured to support one or more location services for UEs 204 that can connect to the LMF 270 via the core network, NGC 260, and/or via the Internet (not illustrated) .
  • FIG. 3 illustrates an exemplary base station 302 (e.g., an eNB, a gNB, a small cell AP, a WLAN AP, etc. ) in communication with an exemplary UE 304 in a wireless network, according to aspects of the disclosure.
  • the base station 302 may correspond to any of base stations 102, 150, and 180 in FIG. 1 or gNB 222 or eNB 224 in FIGS. 2A and 2B
  • the UE 304 may correspond to any of UEs 104, 152, 182, 190 in FIG. 1 or UE 204 in FIGS. 2A and 2B.
  • IP packets from the core network may be provided to a controller/processor 375.
  • the controller/processor 375 implements functionality for a radio resource control (RRC) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer.
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • RLC radio link control
  • MAC medium access control
  • the transmit (TX) processor 316 and the receive (RX) processor 370 implement Layer-1 functionality associated with various signal processing functions.
  • Layer-1 which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding/decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation/demodulation of physical channels, and MIMO antenna processing.
  • the TX processor 316 handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK) , quadrature phase-shift keying (QPSK) , M-phase-shift keying (M-PSK) , M-quadrature amplitude modulation (M-QAM) ) .
  • BPSK binary phase-shift keying
  • QPSK quadrature phase-shift keying
  • M-PSK M-phase-shift keying
  • M-QAM M-quadrature amplitude modulation
  • the coded and modulated symbols may then be split into parallel streams.
  • Each stream may then be mapped to an orthogonal frequency division multiplexing (OFDM) subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream.
  • OFDM orthogonal frequency division multiplexing
  • IFFT Inverse Fast Fourier Transform
  • the OFDM stream is spatially precoded to produce multiple spatial streams.
  • Channel estimates from a channel estimator 374 may be used to determine the coding and modulation scheme, as well as for spatial processing.
  • the channel estimate may be derived from a reference signal and/or channel condition feedback transmitted by the UE 304.
  • Each spatial stream may then be provided to one or more different antennas 320 via a separate transmitter 318a.
  • Each transmitter 318a may modulate an RF carrier with a respective spatial stream for transmission.
  • each receiver 354a receives a signal through its respective antenna 352. Each receiver 354a recovers information modulated onto an RF carrier and provides the information to the RX processor 356.
  • the TX processor 368 and the RX processor 356 implement Layer-1 functionality associated with various signal processing functions.
  • the RX processor 356 may perform spatial processing on the information to recover any spatial streams destined for the UE 304. If multiple spatial streams are destined for the UE 304, they may be combined by the RX processor 356 into a single OFDM symbol stream. The RX processor 356 then converts the OFDM symbol stream from the time-domain to the frequency domain using a fast Fourier transform (FFT) .
  • FFT fast Fourier transform
  • the frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal.
  • the symbols on each subcarrier, and the reference signal are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station 302. These soft decisions may be based on channel estimates computed by the channel estimator 358.
  • the soft decisions are then decoded and de-interleaved to recover the data and control signals that were originally transmitted by the base station 302 on the physical channel.
  • the data and control signals are then provided to the controller/processor 359, which implements Layer-3 and Layer-2 functionality.
  • the controller/processor 359 can be associated with a memory 360 that stores program codes and data.
  • the memory 360 may be referred to as a computer-readable medium.
  • the controller/processor 359 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the core network.
  • the controller/processor 359 is also responsible for error detection.
  • the controller/processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression/decompression, and security (ciphering, deciphering, integrity protection, integrity verification) ; RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.
  • RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting
  • PDCP layer functionality associated with header
  • Channel estimates derived by the channel estimator 358 from a reference signal or feedback transmitted by the base station 302 may be used by the TX processor 368 to select the appropriate coding and modulation schemes, and to facilitate spatial processing.
  • the spatial streams generated by the TX processor 368 may be provided to different antenna 352 via separate transmitters 354b. Each transmitter 354b may modulate an RF carrier with a respective spatial stream for transmission.
  • the transmitters 354b and the receivers 354a may be one or more transceivers, one or more discrete transmitters, one or more discrete receivers, or any combination thereof.
  • the controller/processor 375 can be associated with a memory 376 that stores program codes and data.
  • the memory 376 may be referred to as a computer-readable medium.
  • the controller/processor 375 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE 304. IP packets from the controller/processor 375 may be provided to the core network.
  • the controller/processor 375 is also responsible for error detection.
  • FIG. 4 illustrates an example of a downlink frame structure 400 according to aspects of the disclosure.
  • time is represented horizontally (e.g., on the X axis) with time increasing from left to right
  • frequency is represented vertically (e.g., on the Y axis) with frequency increasing (or decreasing) from bottom to top.
  • a frame 410 (10 ms) is divided into 10 equally sized subframes 420 (1 ms) .
  • Each subframe 420 includes two consecutive time slots 430 (0.5 ms) .
  • a resource grid may be used to represent two time slots 430, each time slot 430 including one or more resource blocks (RBs) 440.
  • a resource block 440 contains 12 consecutive subcarriers 450 in the frequency domain and, for a normal cyclic prefix (CP) in each OFDM symbol 460, 7 consecutive OFDM symbols 460 in the time domain.
  • CP normal cyclic prefix
  • a resource of one OFDM symbol length in the time domain and one subcarrier in the frequency domain (represented as a block of the resource grid) is referred to as a resource element (RE) .
  • RE resource element
  • LTE and in some cases 5G NR, utilize OFDM on the downlink and single-carrier frequency division multiplexing (SC-FDM) on the uplink.
  • SC-FDM single-carrier frequency division multiplexing
  • OFDM and SC-FDM partition the system bandwidth into multiple (K) orthogonal subcarriers 450, which are also commonly referred to as tones, bins, etc.
  • K orthogonal subcarriers 450
  • Each subcarrier 450 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 450 may be fixed, and the total number of subcarriers 450 (K) may be dependent on the system bandwidth.
  • the spacing of the subcarriers 450 may be 15 kHz and the minimum resource allocation (resource block) may be 12 subcarriers 450 (or 180 kHz) . Consequently, the nominal 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.
  • the resource elements include a downlink reference signal (DL-RS) .
  • the DL-RS may include cell-specific RS (CRS) (also sometimes called common RS) and UE-specific RS (UE-RS) .
  • CRS cell-specific RS
  • UE-RS UE-specific RS
  • UE-RS are transmitted only on the resource blocks 440 upon which the corresponding physical downlink shared channel (PDSCH) is mapped.
  • PDSCH physical downlink shared channel
  • the number of bits carried by each resource element depends on the modulation scheme. Thus, the more resource blocks 440 that a UE receives and the higher the modulation scheme, the higher the data rate for the UE.
  • DSS dynamic spectrum sharing
  • NR network nodes are expected to perform rate matching to occupy the resources in the LTE frequency band (s) that are not occupied by LTE traffic.
  • LTE frequency band s
  • NR network nodes are expected to perform rate matching to occupy the resources in the LTE frequency band (s) that are not occupied by LTE traffic.
  • LTE frequency band s
  • NR network nodes are expected to perform rate matching to occupy the resources in the LTE frequency band (s) that are not occupied by LTE traffic.
  • SCS subcarrier spacing
  • the NR PDSCH the main data bearing channel, which is allocated to users on a dynamic and opportunistic basis
  • IE RRC information element
  • NR PDSCH traffic can be rate-matched to fit on the remaining subcarriers of the LTE CRS symbols, thereby increasing throughput for NR users without impacting legacy LTE users.
  • NR traffic For downlink scheduling, in the slot shared between LTE and NR traffic, to avoid conflict with the LTE physical downlink control channel (PDCCH) , the NR traffic starts from the second symbol of the slot and only type B scheduling is used.
  • PDCCH physical downlink control channel
  • SS NR synchronization signal
  • PBCH physical broadcast channel
  • SSB synchronization signal block
  • FIGS. 6A and 6B for antenna ports 0 and 1, transmission of LTE CRS is fixed at the first and fifth symbols (i.e., symbols #0 and #4) of a subframe, meaning there are not four consecutive empty symbols, even with one antenna port CRS (see, e.g., resource grid 610) .
  • FIG. 5 illustrates an exemplary SSB configuration 500 in NR, according to aspects of the disclosure.
  • an SSB configuration 500 comprises four symbols 510 –540, the first spanning 12 RBs and the remaining three spanning 20 RBs.
  • the first symbol 510 carries the primary synchronization signal (PSS) , the second symbol 520 a PBCH, the third symbol 530 a secondary synchronization signal (SSS) , and the fourth symbol 540 a PBCH.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • PBCH RBs also fill up the remaining RBs of the third symbol 530 carrying the SSS, as shown.
  • the PSS and SSS in the first and third symbols 510 and 530 comprise 12 RBs each and there are a total of 48 PBCHs RBs.
  • the PSS and SSS each comprise 127 subcarriers (each RB comprises 12 subcarriers, hence 12 RBs would be 144 subcarriers, minus some guard subcarriers, thereby reducing the total number of subcarriers to 127) .
  • the second and fourth symbols 520 and 540 carrying the PBCH include the PBCH demodulation reference signal (DMRS) and the PBCH data.
  • the 20 RBs of each PBCH have a comb-3 DMRS (i.e., a DMRS is transmitted on every third subcarrier) .
  • FIGS. 6A to 6B illustrate CRS patterns in LTE for a normal cyclic prefix, according to aspects of the disclosure.
  • FIG. 6A illustrates a resource grid 610 for an LTE CRS pattern for CRS transmitted on one antenna port, specifically, antenna port 0. The locations of CRS transmitted on antenna port 0 are indicated by “R 0 . ”
  • FIG. 6B illustrates resource grids 620 and 630 for LTE CRS patterns for CRS transmitted on two antenna ports, specifically, antenna ports 0 and 1. The locations of CRS for antenna ports 0 and 1 are indicated by “R 0 ” and “R 1 , ” respectively. Note that the cross-hatched REs show the locations of CRS transmitted on the other antenna port.
  • REs labeled “R 1 ” show where CRS are transmitted on antenna port 1
  • the cross-hatched REs show where CRS are transmitted on antenna port 0.
  • FIG. 6C illustrates resource grids 640 to 670 for LTE CRS patterns for CRS transmitted on four antenna ports, specifically, antenna ports 0 to 3.
  • the locations of CRS are indicated by “R 0 , ” “R 1 , ” “R 2 , ” and “R 3 , ” respectively.
  • the cross-hatched REs show the locations of CRS transmitted on other antenna ports.
  • REs labeled “R 2 ” show where CRS are transmitted on antenna port 2
  • the cross-hatched REs show where CRS are transmitted on antenna ports 0, 1, and 3.
  • the maximum number of unused symbols between REs carrying LTE CRS is three symbols (as in one and two antenna port CRS) .
  • an NR SSB occupies four symbols.
  • a transmission point e.g., a gNB
  • MMSFN multimedia broadcast single frequency network
  • DCI downlink control information
  • the NR SSB can be redesigned with two or three symbols instead of four.
  • a new SSB pattern can be defined by performing rate matching on the SSB to avoid conflict with LTE CRS.
  • the reference point for downlink transmissions is the start of a slot (i.e., symbol #0) , and typically, the PDCCH starts in the fourth symbol of a slot.
  • the DMRS symbol can start only at symbol #2 or #3 regardless of the PDSCH start and length.
  • the reference point for downlink transmissions can be any symbol in the slot, meaning the PDCCH, for example, can start in any symbol.
  • the DMRS symbol can start at the first PDSCH symbol regardless of where the PDSCH starts.
  • FIG. 7 illustrates an exemplary MBSFN subframe 700, according to aspects of the disclosure.
  • the first two symbols are used to transmit LTE CRS and the third symbol is used to transmit the NR PDCCH.
  • An NR PDSCH can start at the fourth or fifth symbol of a slot, and in the example of FIG. 7, starts at the fourth symbol (symbol #3) .
  • the reference point for the PDSCH is not symbol #0, as in type A scheduling, but rather, symbol #3, meaning this is an example of type B scheduling.
  • the MBSFN subframe 700 includes two downlink symbols for LTE CRS (symbols #0 and #1) , one downlink symbol for the NR PDCCH (symbol #3) , seven downlink symbols for the NR DMRS (symbols #3 to #7, #12, and #13) , and four downlink symbols for the NR SSB (symbols #8 to #11) .
  • NR DMRS are scheduled in one or two of the remaining seven non-contiguous symbols.
  • the four consecutive symbols of the NR SSB can be configured to begin on any of the third symbol (symbol #2) to the eleventh symbol (symbol #10) of an MBSFN subframe 700.
  • the four SSB symbols begin at the ninth symbol (symbol #8) of the MBSFN subframe 700. If the SSB symbols are transmitted on symbols #8 to #11, and the PDCCH is transmitted on symbol #2, then the seven non-contiguous symbols are scheduled after the PDCCH symbol and around the SSB symbols on symbols #3 to #7, #12, and #13.
  • the transmission point e.g., gNB
  • the transmission point needs to inform the UE of which symbol is the first symbol of the SSB.
  • This information can be signaled in the downlink grant (i.e., DCI format 1, which schedules the PDSCH in one cell) .
  • the downlink grant should indicate that the SSB is in a particular slot, either with an explicit one-bit value or a cyclic redundancy check (CRC) scrambled by a radio network temporary identifier (RNTI) .
  • the downlink grant should also indicate the SSB starting symbol, which, as described above, could be any value from ‘2’ to ‘10.
  • the UE On the UE side, based on the information about the SSB received in the downlink grant, the UE should not expect any data to be scheduled on the symbols used for the SSB if type B scheduling has not been extended from seven symbols to 10 or 11 symbols. However, if type B scheduling is extended to 11 symbols, the UE can assume that data may be scheduled on the remaining RBs of the SSB symbols. In this case, the UE can perform rate matching on the remaining RBs. Because the DMRS symbols are scheduled around the SSB symbols, the UE does not expect a collision of DMRS and SSB symbols.
  • LTE CRS are configured on symbols #0, #4, #7, and #11 (see, e.g., FIG. 6B)
  • LTE CRS are configured on symbols #0, #1, #4, #7, #8, and #11 (see, e.g., FIG. 6C)
  • an SSB occupies four symbols and 20 RBs, including 12 RBs for the PSS, 12 RBs for the SSS, and 48 RBs for the PBCH.
  • the SSB can be reconfigured to span two or three symbols instead of four, as illustrated in FIG. 8.
  • the synchronization signals i.e., the PSS and SSS
  • the synchronization signals should remain in the center of the SSB, with the PBCH symbols around them.
  • the PSS and SSS For a three-symbol SSB configuration 810, there is no change to the PSS and SSS, meaning they are transmitted on 12 RBs in the first and third symbols, respectively, of the SSB configuration 810.
  • the PBCH occupies 30 RBs at the second symbol and nine RBs on either side of the SSS in the third symbol, for a total of 48 PBCH RBs.
  • the configuration of the two-and three-symbol SSBs are different than the current SSB configuration (illustrated in FIG. 5)
  • a transmission point e.g., a gNB
  • a transmission point can use a different synchronization signal sequence to notify the UE that the SSB is a two-or three-symbol SSB.
  • a transmission point may use a two-or three-symbol SSB only for DSS carriers for NR-capable UEs.
  • the network would have the flexibility to select one of the SSB configurations if both are supported (by the transmission point and the UE) .
  • the two-symbol SSB configuration 820 is preferable, however, because it can be used with a four antenna ports LTE CRS configuration (see, e.g., FIG. 6C) .
  • a four-symbol SSB pattern can be used with rate matching to reduce the number of symbols needed for the SSB to three symbols. More specifically, as shown above in FIGS. 6A and 6B, for CRS transmitted on only one or two antenna ports, there are at most three consecutive symbols that can be used for SSB (s) . As such, an SSB can be configured to start at symbol #1 (as opposed to symbol #2 currently) and/or symbol #8. This prevents a collision of the PSS (on the first symbol of the SSB) with LTE CRS. In this case, only the last symbol (carrying the PBCH) needs to be rate matched, and the other symbols (carrying the PSS, SSS, and first PBCH) do not.
  • the second additional DMRS may be defined in high-speed, high-mobility scenarios, such as high-speed train (HST) scenarios (aspecial very high mobility case) .
  • HST high-speed train
  • the second additional DMRS may be at symbol #11, or, as illustrated by subframe configuration 920, the second additional DMRS may be at symbol #12.
  • Subframe configuration 910 is for a normal subframe configuration
  • subframe configuration 920 is for an “lte-CRS-ToMatchAround” configuration.
  • DMRS could be configured for symbol #9 as well, but for time diversity, symbols #11 or #12 are preferable. That is, scheduling the DMRS on symbol #11 or #12 provides some time diversity between the additional DMRS on symbol #8 and the second additional DMRS.
  • NR DMRS may be transmitted on symbols #5, #9, and #12. That is, since NR DMRS cannot be transmitted on symbol #4, as in subframe configurations 910 and 920 without interfering with LTE CRS, it is instead transmitted on symbol #5. For the same reason, the additional DMRS is transmitted on symbol #9 instead of symbol #8. The second additional DMRS, however, can still be transmitted on symbol #12.
  • FIG. 10 illustrates an exemplary method 1000 of wireless communication, according to aspects of the disclosure.
  • the method 1000 may be performed by a UE, such as any of the UEs described herein, or a transmission point, such as any of the base stations described herein.
  • the method 1000 includes receiving from the transmission point or transmitting to the UE, over a wireless communication medium shared by a first RAT (e.g., LTE) and a second RAT (e.g., NR) , DCI indicating a first symbol of an SSB for the second RAT within an MBSFN subframe.
  • the DCI provides downlink scheduling for a PDSCH for the UE on the second RAT and is a downlink grant for the UE in the second RAT.
  • FIG. 11 illustrates an exemplary method 1100 of wireless communication, according to aspects of the disclosure.
  • the method 1100 may be performed by a UE, such as any of the UEs described herein, or a transmission point, such as any of the base stations described herein.
  • the method 1100 includes receiving from the transmission point or transmitting to the UE, over a wireless communication medium shared by a first RAT (e.g., LTE) and a second RAT (e.g., NR) , a subframe comprising at least four symbols carrying a CRS for the first RAT and no more than three consecutive symbols carrying an SSB for the second RAT, wherein there are no more than three symbols between each of the at least four symbols carrying the CRS, as described above with reference to FIG. 8.
  • a first RAT e.g., LTE
  • a second RAT e.g., NR
  • FIG. 12 illustrates an exemplary method 1200 of wireless communication, according to aspects of the disclosure.
  • the method 1200 may be performed by a UE, such as any of the UEs described herein, or a transmission point, such as any of the base stations described herein.
  • the method 1200 includes receiving from the transmission point or transmitting to the UE, over a wireless communication medium shared by a first RAT (e.g., LTE) and a second RAT (e.g., NR) , a subframe comprising at least four symbols carrying a CRS for the first RAT and four consecutive symbols carrying an SSB for the second RAT.
  • a first RAT e.g., LTE
  • a second RAT e.g., NR
  • a general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, for example, 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.
  • a software module may reside in random access memory (RAM) , flash memory, read-only memory (ROM) , erasable programmable ROM (EPROM) , electrically erasable programmable ROM (EEPROM) , registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium.
  • the storage medium may be integral to the processor.
  • the processor and the storage medium may reside in an ASIC.
  • the ASIC may reside in a user terminal (e.g., UE) .
  • the processor and the storage medium may reside as discrete components in a user terminal.
  • the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a storage media may be any available media that can be accessed by a computer.
  • such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
  • 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, 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 includes compact disc (CD) , laser disc, optical disc, digital versatile disc (DVD) , floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

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

Abstract

L'invention concerne des techniques de communication sans fil. Selon un aspect, un procédé comprend la réception en provenance d'un point de transmission ou l'émission à un équipement d'utilisateur (UE), par le biais d'un support de communication sans fil partagé par une première technologie d'accès radio (RAT) et une deuxième RAT, d'informations de commande de liaison descendante (DCI) indiquant un premier symbole d'un bloc de signal de synchronisation (SSB) pour la deuxième RAT à l'intérieur d'une sous-trame de réseau monofréquence de diffusion multimédia (MBSFN), et la réception en provenance du point d'émission ou l'émission à l'UE de la sous-trame MBSFN par le biais du support de communication sans fil, la sous-trame MBSFN comprenant au moins un symbole transportant un signal de référence spécifique à une cellule (CRS) pour la première RAT et quatre symboles consécutifs transportant le SSB, les quatre symboles consécutifs transportant le SSB commençant au premier symbole indiqué dans les DCI.
PCT/CN2019/098992 2019-08-02 2019-08-02 Conception de bloc de signal de synchronisation de partage de spectre dynamique (dss) et signal de référence de démodulation (dmrs) supplémentaire WO2021022395A1 (fr)

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