WO2021138798A1 - Recherche inactive et modifications de mesure dues à une configuration de temps de mesure non fiable - Google Patents

Recherche inactive et modifications de mesure dues à une configuration de temps de mesure non fiable Download PDF

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Publication number
WO2021138798A1
WO2021138798A1 PCT/CN2020/070639 CN2020070639W WO2021138798A1 WO 2021138798 A1 WO2021138798 A1 WO 2021138798A1 CN 2020070639 W CN2020070639 W CN 2020070639W WO 2021138798 A1 WO2021138798 A1 WO 2021138798A1
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WIPO (PCT)
Prior art keywords
rat
ssb
cells
smtc
time window
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PCT/CN2020/070639
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English (en)
Inventor
Arvind Vardarajan Santhanam
Sumit Kumar Singh
Ling Xie
Vishal HINGORANI
Preeti SIVAKUMAR
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Qualcomm Incorporated
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Priority to PCT/CN2020/070639 priority Critical patent/WO2021138798A1/fr
Publication of WO2021138798A1 publication Critical patent/WO2021138798A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports

Definitions

  • aspects of the technology described below generally relate to wireless communication and to techniques and apparatuses for idle search and measurement modifications due to unreliable measurement time configuration. Some techniques and apparatuses described herein enable and provide wireless communication devices and systems configured for enhanced network coverage and efficient power usage.
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts.
  • Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, and/or the like) .
  • multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, orthogonal frequency-division multiple access (OFDMA) systems, single-carrier frequency-division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE) .
  • LTE/LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP) .
  • UMTS Universal Mobile Telecommunications System
  • a wireless communication network may include a number of base stations (BSs) that can support communication for a number of user equipment (UEs) .
  • a user equipment (UE) may communicate with a base station (BS) via the downlink and uplink.
  • the downlink (or forward link) refers to the communication link from the BS to the UE
  • the uplink (or reverse link) refers to the communication link from the UE to the BS.
  • a BS may be referred to as a Node B, a gNB, an access point (AP) , a radio head, a transmit receive point (TRP) , a New Radio (NR) BS, a 5G Node B, and/or the like.
  • New Radio which may also be referred to as 5G
  • 3GPP Third Generation Partnership Project
  • a UE may measure one or more synchronization signal blocks (SSBs) during operation. Measurements can take place in connection with radio resource management, beam management, and/or the like. For example, the UE may measure SSBs of one or more cells to assist with a cell search, a neighbor cell search, a cell selection, a cell reselection, a handover, a serving cell beam sweeping operation, and/or the like.
  • SSBs may generally be transmitted in groups, which may be referred to as SS bursts or SS burst sets. SS bursts may have a periodicity based at least in part on a time spacing between SSB transmissions.
  • a UE may be configured with an SSB measurement timing configuration (SMTC) .
  • SMTC SSB measurement timing configuration
  • An SMTC parameter can indicate a periodicity, a time length, and/or an offset of SSB measurement occasions (e.g., occasions in which one or more base stations transmit SSBs to be measured by the UE) .
  • multiple wireless networks may be deployed within an overlapping or same area or region.
  • Multiple network deployments in a common space can support UEs having different data requirements, communication capabilities, operator subscriptions, and/or the like.
  • an LTE network and an NR network may be deployed in a particular region by the same mobile network operator (MNO) or different MNOs.
  • MNO mobile network operator
  • multiple network deployment in a common area can present challenges.
  • a base station associated with the LTE network may transmit signaling (e.g., a system information block (SIB) ) to advertise one or more NR frequencies and to provide the UE with an SMTC that indicates a periodicity, a duration, and an offset of SSBs transmitted on the NR frequencies.
  • SIB system information block
  • the periodicity, duration, and offset indicated in the SMTC provided by the LTE network may be defined with respect to system frame number (SFN) zero on the LTE network.
  • UEs may use the periodicity, duration, and offset indicated in the SMTC provided by the LTE network to determine a location (e.g., a time window) in which to capture samples of the SSBs transmitted on the NR frequencies with respect to SFN zero on the LTE network.
  • the UEs may capture the SSB samples to obtain LTE-to-NR (L2NR) measurements while in an idle mode on the LTE network to enable reselection to the NR network (e.g., after an evolved packet system (EPS) fallback voice over LTE (VoLTE) call has ended) .
  • EPS evolved packet system
  • VoLTE voice over LTE
  • the UEs may determine a time window in which to perform a search to detect one or more cells on the NR frequencies and in which to schedule L2NR measurements on NR frequencies in which one or more cells are detected based at least in part on the periodicity, duration, and offset indicated in the SMTC configured by the LTE network.
  • the LTE network may incorrectly determine the locations or positions in which NR SSBs are transmitted, which may result in an SMTC having a periodicity, duration, and/or offset that is misconfigured with respect to the SFN on the LTE network.
  • a UE may be guaranteed to detect a cell from radio frequency (RF) samples captured over any five millisecond period due to the numerology associated with primary synchronization signal and secondary synchronization signal transmissions.
  • RF radio frequency
  • LTE networks are generally asynchronous with respect to other LTE networks and with respect to NR networks.
  • the LTE networks and the NR networks may have independent oscillators that may drift independently from one another (e.g., up to 0.1 microseconds per second) .
  • the LTE network may not know exactly when SSBs are transmitted on NR frequencies, and even if the LTE network happens to configure an SMTC with a periodicity, duration, and offset that coincides with SSB transmissions on the NR frequencies, the SMTC may become inaccurate or otherwise unreliable over time as the independent time drifts on the LTE network and the NR frequencies accumulate.
  • a UE may be unable to detect and/or measure a cell on the NR frequencies and may become trapped on the LTE network (e.g., unable to reselect to the NR network) in cases where the periodicity, duration, and/or offset indicated in the SMTC are incorrect, where the LTE network does not configure an SMTC, or where the SMTC is otherwise unreliable.
  • aspects may be implemented by a UE due to an unreliable measurement time configuration, such as an SMTC provided by an LTE network that indicates a periodicity, a duration, and an offset for SSB transmissions on an NR frequency.
  • an SMTC provided by an LTE network that indicates a periodicity, a duration, and an offset for SSB transmissions on an NR frequency.
  • a UE may receive an SMTC that indicates a periodicity, duration, and offset for SSB transmissions on an NR frequency from one or more base stations associated with an LTE network, and the UE may perform a search to detect one or more SSB spans across one or more cells in the NR frequency over a first time window that corresponds to a configured periodicity associated with the NR frequency (e.g., 20 milliseconds) . Accordingly, the UE may be guaranteed to detect SSB samples from any cells that are operating on the NR frequency over the first time window.
  • a configured periodicity associated with the NR frequency e.g. 20 milliseconds
  • the UE may then determine a second time window in which to measure the one or more cells in the NR frequency depending on whether the detected SSB spans are within a time window indicated in the network-configured SMTC.
  • the second time window may have a duration and an offset determined from the network-configured SMTC if all detected SSB spans are within a time window indicated in the network-configured SMTC. Otherwise, if the detected SSB spans are at least partially outside the time window indicated in the network-configured SMTC, the second time window may be determined to cover a union of the SSB spans of all detected cells.
  • the second time window may be determined to cover a union of a subset of the detected SSB spans that satisfy a threshold (e.g., having a signal strength that exceeds a threshold, is within a threshold of a network-configured reselection threshold, and/or the like) .
  • a threshold e.g., having a signal strength that exceeds a threshold, is within a threshold of a network-configured reselection threshold, and/or the like.
  • the UE may detect and measure one or more NR cells on an NR frequency (e.g., while in an idle mode on the LTE network) even if the LTE network has misconfigured or not configured an SMTC for the NR frequency, which enables the UE to camp on the one or more NR cells, reselect to the NR cell (s) , conserve power that would otherwise be consumed using a misconfigured SMTC, and/or the like.
  • a method of wireless communication may include: receiving, from a wireless network associated with a first radio access technology (RAT) , an SMTC for a frequency associated with a second RAT; detecting one or more SSB spans across one or more cells in the frequency associated with the second RAT over a first time window that is based at least in part on a configured periodicity for the frequency associated with the second RAT; and measuring the one or more cells in the frequency associated with the second RAT over a second time window that is determined based at least in part on whether the one or more SSB spans are within an SSB duration indicated in the SMTC received from the wireless network associated with the first RAT.
  • RAT radio access technology
  • a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory.
  • the memory and the one or more processors may be configured to: receive, from a wireless network associated with a first RAT, an SMTC for a frequency associated with a second RAT; detect one or more SSB spans across one or more cells in the frequency associated with the second RAT over a first time window that is based at least in part on a configured periodicity for the frequency associated with the second RAT; and measure the one or more cells in the frequency associated with the second RAT over a second time window that is determined based at least in part on whether the one or more SSB spans are within an SSB duration indicated in the SMTC received from the wireless network associated with the first RAT.
  • a non-transitory computer-readable medium may store one or more instructions for wireless communication.
  • the one or more instructions when executed by one or more processors of a UE, may cause the one or more processors to: receive, from a wireless network associated with a first RAT, an SMTC for a frequency associated with a second RAT; detect one or more SSB spans across one or more cells in the frequency associated with the second RAT over a first time window that is based at least in part on a configured periodicity for the frequency associated with the second RAT; and measure the one or more cells in the frequency associated with the second RAT over a second time window that is determined based at least in part on whether the one or more SSB spans are within an SSB duration indicated in the SMTC received from the wireless network associated with the first RAT.
  • an apparatus for wireless communication may include: means for receiving, from a wireless network associated with a first RAT, an SMTC for a frequency associated with a second RAT; means for detecting one or more SSB spans across one or more cells in the frequency associated with the second RAT over a first time window that is based at least in part on a configured periodicity for the frequency associated with the second RAT; and means for measuring the one or more cells in the frequency associated with the second RAT over a second time window that is determined based at least in part on whether the one or more SSB spans are within an SSB duration indicated in the SMTC received from the wireless network associated with the first RAT.
  • aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communication device, and/or processing system as substantially described herein with reference to and as illustrated by the accompanying drawings and specification.
  • Fig. 1 is a block diagram conceptually illustrating an example of a wireless communication network, in accordance with various aspects of the present disclosure.
  • Fig. 2 is a block diagram conceptually illustrating an example of a base station in communication with a UE in a wireless communication network, in accordance with various aspects of the present disclosure.
  • Fig. 3A is a block diagram conceptually illustrating an example of a frame structure in a wireless communication network, in accordance with various aspects of the present disclosure.
  • Fig. 3B is a block diagram conceptually illustrating an example synchronization communication hierarchy in a wireless communication network, in accordance with various aspects of the present disclosure.
  • Fig. 4 is a block diagram conceptually illustrating an example slot format with a normal cyclic prefix, in accordance with various aspects of the present disclosure.
  • Fig. 5 is a block diagram conceptually illustrating an example network architecture via which a multi-mode UE may operate, in accordance with various aspects of the present disclosure.
  • Figs. 6A-6B are diagrams illustrating one or more examples of idle search and measurement modifications due to an unreliable measurement time configuration, in accordance with various aspects of the present disclosure.
  • Fig. 7 is a diagram illustrating an example process performed, for example, by a UE, in accordance with various aspects of the present disclosure.
  • aspects may be described herein using terminology commonly associated with 3G and/or 4G wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems, such as 5G and later, including NR technologies.
  • Implementations may range a spectrum from chip-level or modular components to non-modular, non-chip-level implementations and further to aggregate, distributed, or OEM devices or systems incorporating one or more aspects of the described innovations.
  • devices incorporating described aspects and features may also necessarily include additional components and features for implementation and practice of claimed and described embodiments.
  • transmission and reception of wireless signals necessarily includes a number of components for analog and digital purposes (e.g., hardware components including one or more antennas, RF-chains, power amplifiers, modulators, buffers, processors, interleavers, adders/summers, and/or the like) .
  • innovations described herein may be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, end-user devices, etc. of varying sizes, shapes, and constitution.
  • Fig. 1 is a diagram illustrating a wireless network 100 in which aspects of the present disclosure may be practiced.
  • the wireless network 100 may be an LTE network or some other wireless network, such as a 5G or NR network.
  • the wireless network 100 may include a number of BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities.
  • a BS is an entity that communicates with user equipment (UEs) and may also be referred to as a base station, a NR BS, a Node B, a gNB, a 5G node B (NB) , an access point, a transmit receive point (TRP) , and/or the like.
  • Each BS may provide communication coverage for a particular area (e.g., a fixed or changing geographical area) .
  • BSs 110 may be stationary or non-stationary. In some non-stationary scenarios, mobile BSs 110 may move with varying speeds, direction, and/or heights.
  • the term “cell” can refer to a coverage area of a BS 110 and/or a BS subsystem serving this coverage area, depending on the context in which the term is used.
  • a BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or another type of cell.
  • a macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription. Additionally, or alternatively, a BS may support access to an unlicensed RF band (e.g., a wireless local area network (WLAN) band and/or the like) .
  • WLAN wireless local area network
  • a pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription.
  • a femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs having association with the femto cell (e.g., UEs in a closed subscriber group (CSG) ) .
  • a BS for a macro cell may be referred to as a macro BS.
  • a BS for a pico cell may be referred to as a pico BS.
  • a BS for a femto cell may be referred to as a femto BS or a home BS.
  • a BS 110a may be a macro BS for a macro cell 102a
  • a BS 110b may be a pico BS for a pico cell 102b
  • a BS 110c may be a femto BS for a femto cell 102c.
  • a BS may support one or multiple (e.g., three) cells.
  • the terms “eNB” , “base station” , “NR BS” , “gNB” , “TRP” , “AP” , “node B” , “5G NB” , and “cell” may be used interchangeably herein.
  • a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile BS.
  • the BSs may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces such as a direct physical connection, a virtual network, and/or the like using any suitable transport network.
  • BSs may be implemented in a software defined network (SDN) manner or via network function virtualization (NFV) manner.
  • SDN software defined network
  • NFV network function virtualization
  • Wireless network 100 may also include relay stations.
  • a relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send a transmission of the data to a downstream station (e.g., a UE or a BS) .
  • a relay station may also be a UE that can relay transmissions for other UEs.
  • a relay station 110d may communicate with macro BS 110a and a UE 120d in order to facilitate communication between BS 110a and UE 120d.
  • a relay station may also be referred to as a relay BS, a relay base station, a relay, and/or the like.
  • Wireless network 100 may be a heterogeneous network that includes BSs of different types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/or the like. These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in wireless network 100.
  • macro BSs may have a high transmit power level (e.g., 5 to 40 Watts) whereas pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 Watts) .
  • a network controller 130 may couple to a set of BSs and may provide coordination and control for these BSs.
  • Network controller 130 may communicate with the BSs via a backhaul.
  • the BSs may also communicate with one another, e.g., directly or indirectly via a wireless or wireline backhaul.
  • UEs 120 may be dispersed throughout wireless network 100, and each UE may be stationary or mobile.
  • a UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, and/or the like.
  • a UE may be a cellular phone (e.g., a smart phone) , a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, biometric sensors/devices, wearable devices (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (e.g., smart ring, smart bracelet) ) , an entertainment device (e.g., a music or video device, or a satellite radio) , a vehicular component or sensor, smart meters/sensors, industrial manufacturing equipment, robotics, drones, implantable devices, augmented reality devices, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium.
  • PDA personal digital assistant
  • WLL wireless local loop
  • MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, and/or the like, that may communicate with a base station, another device (e.g., remote device) , or some other entity.
  • a wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link.
  • Some UEs may be considered Internet-of-Things (IoT) devices, and/or may be implemented as may be implemented as NB-IoT (narrowband internet of things) devices. Some UEs may be considered a Customer Premises Equipment (CPE) .
  • UE 120 may be included inside a housing that houses components of UE 120, such as processor components, memory components, and/or the like. These components may be integrated in a variety of combinations and/or may be stand-alone, distributed components considering design constraints and/or operational preferences.
  • 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, and/or the like.
  • a frequency may also be referred to as a carrier, a frequency channel, and/or the like.
  • Each frequency may support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs.
  • NR or 5G RAT networks may be deployed.
  • two or more UEs 120 may communicate directly using one or more sidelink channels (e.g., without using a base station 110 as an intermediary to communicate with one another) .
  • the UEs 120 may communicate using peer-to-peer (P2P) communications, device-to-device (D2D) communications, a vehicle-to-everything (V2X) protocol (e.g., which may include a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, and/or the like) , a mesh network, and/or the like.
  • V2X vehicle-to-everything
  • the UE 120 may perform scheduling operations, resource selection operations, and/or other operations described elsewhere herein as being performed by the base station 110.
  • a UE performing scheduling operations can include or perform base-station-like functions in these deployment scenarios.
  • Fig. 1 is provided merely as an example. Other examples may differ from what is described with regard to Fig. 1.
  • Fig. 2 shows a block diagram of a design 200 of base station 110 and UE 120, which may be one of the base stations and one of the UEs in Fig. 1.
  • Base station 110 may be equipped with T antennas 234a through 234t
  • UE 120 may be equipped with R antennas 252a through 252r, where in general T ⁇ 1 and R ⁇ 1.
  • the T and R antennas may be configured with multiple antenna elements formed in an array for MIMO or massive MIMO deployments that can occur in millimeter wave (mmWave or mmW) communication systems.
  • mmWave or mmW millimeter wave
  • a transmit processor 220 can carry out a number of functions associated with communications. For example, transmit processor 220 may receive data from a data source 212 for one or more UEs, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQIs) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS (s) selected for the UE, and provide data symbols for all UEs.
  • MCS modulation and coding schemes
  • Transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI) and/or the like) and control information (e.g., CQI requests, grants, upper layer signaling, and/or the like) and provide overhead symbols and control symbols. Transmit processor 220 may also generate reference symbols for reference signals (e.g., the cell-specific reference signal (CRS) ) and synchronization signals (e.g., the primary synchronization signal (PSS) and secondary synchronization signal (SSS) ) .
  • reference signals e.g., the cell-specific reference signal (CRS)
  • synchronization signals e.g., the primary synchronization signal (PSS) and secondary synchronization signal (SSS)
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide T output symbol streams to T modulators (MODs) 232a through 232t.
  • Each modulator 232 may process a respective output symbol stream (e.g., for OFDM and/or the like) to obtain an output sample stream.
  • Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively.
  • the synchronization signals can be generated with location encoding to convey additional information.
  • antennas 252a through 252r may receive downlink RF signals.
  • the downlink RF signals may be received from and/or may be transmitted by one or more base stations 110.
  • the signals can be provided to demodulators (DEMODs) 254a through 254r, respectively.
  • Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a received signal to obtain input samples.
  • Each demodulator 254 may further process the input samples (e.g., for OFDM and/or the like) to obtain received symbols.
  • a MIMO detector 256 may obtain received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller/processor 280.
  • a channel processor may determine reference signal received power (RSRP) , received signal strength indicator (RSSI) , reference signal received quality (RSRQ) , channel quality indicator (CQI) , and/or the like.
  • RSRP reference signal received power
  • RSSI received signal strength indicator
  • RSRQ reference signal received quality
  • CQI channel quality indicator
  • one or more components of UE 120 may be included in a housing.
  • a UE 120 may transmit control information and/or data to another device, such as one or more base stations 110.
  • a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports comprising RSRP, RSSI, RSRQ, CQI, and/or the like) from controller/processor 280. Transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, and/or the like) , and transmitted to base station 110.
  • modulators 254a through 254r e.g., for DFT-s-OFDM, CP-OFDM, and/or the like
  • the uplink signals from UE 120 and other UEs may be received by antennas 234, processed by demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by UE 120.
  • Receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to controller/processor 240.
  • Base station 110 may include communication unit 244 and communicate to network controller 130 via communication unit 244.
  • Network controller 130 may include communication unit 294, controller/processor 290, and memory 292.
  • Controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform one or more techniques associated with idle search and measurement modifications due to an unreliable measurement time configuration, as described in more detail elsewhere herein.
  • controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform or direct operations of, for example, process 700 of Fig. 7 and/or other processes as described herein.
  • Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively.
  • a scheduler 246 may schedule UEs for data transmission on the downlink and/or uplink.
  • the UE 120 may include a variety of means or components for implementing communication functions.
  • the variety of means may include means for receiving, from a wireless network associated with a first RAT, an SMTC for a frequency associated with a second RAT, means for detecting one or more SSB spans across one or more cells in the frequency associated with the second RAT over a first time window that is based at least in part on a configured periodicity for the frequency associated with the second RAT, means for measuring the one or more cells in the frequency associated with the second RAT over a second time window that is determined based at least in part on whether the one or more SSB spans are within an SSB duration indicated in the SMTC received from the wireless network associated with the first RAT, and/or the like.
  • the UE 120 may include a variety of structural components for carrying out functions of the various means.
  • structural components that carry out functions of such means may include one or more components of UE 120 described in connection with Fig. 2, such as antenna 252, DEMOD 254, MOD 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, controller/processor 280, and/or the like.
  • Fig. 2 is provided merely as an example. Other examples may differ from what is described with regard to Fig. 2.
  • Fig. 3A shows an example frame structure 300 for FDD in a telecommunications system (e.g., NR) .
  • the transmission timeline for each of the downlink and uplink may be partitioned into units of radio frames (sometimes referred to as frames) .
  • Each radio frame may have a predetermined duration (e.g., 10 milliseconds (ms) ) and may be partitioned into a set of Z (Z ⁇ 1) subframes (e.g., with indices of 0 through Z-1) .
  • Each subframe may have a predetermined duration (e.g., 1 ms) and may include a set of slots (e.g., 2 m slots per subframe are shown in Fig.
  • Each slot may include a set of L symbol periods.
  • each slot may include fourteen symbol periods (e.g., as shown in Fig. 3A) , seven symbol periods, or another number of symbol periods.
  • the subframe may include 2L symbol periods, where the 2L symbol periods in each subframe may be assigned indices of 0 through 2L–1.
  • a scheduling unit for the FDD may frame-based, subframe-based, slot-based, symbol-based, and/or the like.
  • a wireless communication structure may refer to a periodic time-bounded communication unit defined by a wireless communication standard and/or protocol. Additionally, or alternatively, different configurations of wireless communication structures than those shown in Fig. 3A may be used.
  • a base station may transmit synchronization signals.
  • a base station may transmit a primary synchronization signal (PSS) , a secondary synchronization signal (SSS) , and/or the like, on the downlink for each cell supported by the base station.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • the PSS and SSS may be used by UEs for cell search and acquisition.
  • the PSS may be used by UEs to determine symbol timing
  • the SSS may be used by UEs to determine a physical cell identifier, associated with the base station, and frame timing.
  • the base station may also transmit a physical broadcast channel (PBCH) .
  • the PBCH may carry some system information, such as system information that supports initial access by UEs.
  • the base station may transmit the PSS, the SSS, and/or the PBCH in accordance with a synchronization communication hierarchy (e.g., a synchronization signal (SS) hierarchy) including multiple synchronization communications (e.g., SS blocks) , as described below in connection with Fig. 3B.
  • a synchronization communication hierarchy e.g., a synchronization signal (SS) hierarchy
  • multiple synchronization communications e.g., SS blocks
  • Fig. 3B is a block diagram conceptually illustrating an example SS hierarchy, which is an example of a synchronization communication hierarchy.
  • the SS hierarchy may include an SS burst set, which may include a plurality of SS bursts (identified as SS burst 0 through SS burst B-1, where B is a maximum number of repetitions of the SS burst that may be transmitted by the base station) .
  • each SS burst may include one or more SS blocks (SSBs) (identified in Fig.
  • An SS burst set may be periodically transmitted by a wireless node, such as every X milliseconds, as shown in Fig. 3B.
  • an SS burst set may have a fixed or dynamic length, shown as Y milliseconds in Fig. 3B.
  • the SS burst set shown in Fig. 3B is an example of a synchronization communication set, and other synchronization communication sets may be used in connection with the techniques described herein. Furthermore, an SSB as shown in Fig. 3B is an example of a synchronization communication, and other synchronization communications may be used in connection with the techniques described herein.
  • an SSB includes resources that carry the PSS, the SSS, the PBCH, and/or other synchronization signals (e.g., a tertiary synchronization signal (TSS) ) and/or synchronization channels.
  • synchronization signals e.g., a tertiary synchronization signal (TSS)
  • multiple SSBs may be included in an SS burst, and the PSS, the SSS, and/or the PBCH may be the same across each SSB of the SS burst.
  • a single SSB may be included in an SS burst.
  • the SSB may be at least four symbol periods in length, where each symbol carries one or more of the PSS (e.g., occupying one symbol) , the SSS (e.g., occupying one symbol) , and/or the PBCH (e.g., occupying two symbols) .
  • the symbols of an SSB are consecutive, as shown in Fig. 3B. In some aspects, the symbols of an SSB are non-consecutive. Similarly, in some aspects, one or more SSBs of the SS burst may be transmitted in consecutive radio resources (e.g., consecutive symbol periods) during one or more slots. Additionally, or alternatively, one or more SSBs of the SS burst may be transmitted in non-consecutive radio resources.
  • the SS bursts may have a burst period, whereby the SSBs of the SS burst are transmitted by the base station according to the burst period. In other words, the SSBs may be repeated during each SS burst.
  • the SS burst set may have a burst set periodicity, whereby the SS bursts of the SS burst set are transmitted by the base station according to the fixed burst set periodicity. In other words, the SS bursts may be repeated during each SS burst set.
  • the base station may transmit system information, such as system information blocks (SIBs) on a physical downlink shared channel (PDSCH) in certain slots.
  • SIBs system information blocks
  • the base station may transmit control information/data on a physical downlink control channel (PDCCH) in C symbol periods of a slot, where B may be configurable for each slot.
  • the base station may transmit traffic data and/or other data on the PDSCH in the remaining symbol periods of each slot.
  • Figs. 3A and 3B are provided as examples. Other examples may differ from what is described with regard to Figs. 3A and 3B.
  • Fig. 4 shows an example slot format 400 with a normal cyclic prefix.
  • the available time frequency resources may be partitioned into resource blocks.
  • Each resource block may cover a set of subcarriers (e.g., 12 subcarriers) in one slot and may include a number of resource elements.
  • Each resource element may cover one subcarrier in one symbol period (e.g., in time) and may be used to send one modulation symbol, which may be a real or complex value.
  • An interlace structure may be used for each of the downlink and uplink for FDD in certain telecommunications systems (e.g., NR) .
  • Q interlaces with indices of 0 through Q –1 may be defined, where Q may be equal to 4, 6, 8, 10, or some other value.
  • Each interlace may include slots that are spaced apart by Q frames.
  • interlace q may include slots q, q + Q, q + 2Q, etc., where q ⁇ ⁇ 0, ..., Q –1 ⁇ .
  • a UE may be located within the coverage of multiple BSs. One of these BSs may be selected to serve the UE. The serving BS may be selected based at least in part on various criteria such as received signal strength, received signal quality, path loss, and/or the like. Received signal quality may be quantified by a signal-to-noise-and-interference ratio (SNIR) , or a reference signal received quality (RSRQ) , or some other metric.
  • SNIR signal-to-noise-and-interference ratio
  • RSRQ reference signal received quality
  • the UE may operate in a dominant interference scenario in which the UE may observe high interference from one or more interfering BSs.
  • NR may refer to radios configured to operate according to a new air interface (e.g., other than Orthogonal Frequency Divisional Multiple Access (OFDMA) -based air interfaces) or fixed transport layer (e.g., other than Internet Protocol (IP) ) .
  • OFDM Orthogonal Frequency Divisional Multiple Access
  • IP Internet Protocol
  • NR may utilize OFDM with a CP (herein referred to as cyclic prefix OFDM or CP-OFDM) and/or SC-FDM on the uplink, may utilize CP-OFDM on the downlink and include support for half-duplex operation using TDD.
  • OFDM Orthogonal Frequency Divisional Multiple Access
  • IP Internet Protocol
  • NR may, for example, utilize OFDM with a CP (herein referred to as CP-OFDM) and/or discrete Fourier transform spread orthogonal frequency-division multiplexing (DFT-s-OFDM) on the uplink, may utilize CP-OFDM on the downlink and include support for half-duplex operation using TDD.
  • CP-OFDM OFDM with a CP
  • DFT-s-OFDM discrete Fourier transform spread orthogonal frequency-division multiplexing
  • NR may include Enhanced Mobile Broadband (eMBB) service targeting wide bandwidth (e.g., 80 megahertz (MHz) and beyond) , millimeter wave (mmW) targeting high carrier frequency (e.g., 60 gigahertz (GHz) ) , massive MTC (mMTC) targeting non-backward compatible MTC techniques, and/or mission critical targeting ultra reliable low latency communications (URLLC) service.
  • eMBB Enhanced Mobile Broadband
  • mmW millimeter wave
  • mMTC massive MTC
  • URLLC ultra reliable low latency communications
  • NR resource blocks may span 12 sub-carriers with a sub-carrier bandwidth of 60 or 120 kilohertz (kHz) over a 0.1 millisecond (ms) duration.
  • Each radio frame may include 40 slots and may have a length of 10 ms. Consequently, each slot may have a length of 0.25 ms.
  • Each slot may indicate a link direction (e.g., DL or UL) for data transmission and the link direction for each slot may be dynamically switched.
  • Each slot may include DL/UL data as well as DL/UL control data.
  • NR may support a different air interface, other than an OFDM-based interface.
  • NR networks may include entities such as central units or distributed units.
  • Fig. 4 is provided as an example. Other examples may differ from what is described with regard to Fig. 4.
  • Fig. 5 is a block diagram conceptually illustrating an example network architecture 500 via which a multi-mode UE may operate, in accordance with various aspects of the present disclosure.
  • a UE 505 may be capable of accessing different core networks via different access nodes.
  • the access nodes may include, for example, a gNB 510, an eNB 515, a wireless local area network (WLAN) access point (AP) 520, a Global System for Mobile communications (GSM) Enhanced Data rates for GSM Evolution (EDGE) Radio Access Network (GERAN) and/or UMTS Terrestrial Radio Access Network (UTRAN) access node 525, and/or the like.
  • GSM Global System for Mobile communications
  • EDGE Enhanced Data rates for GSM Evolution
  • GERAN GERAN
  • UTRAN UMTS Terrestrial Radio Access Network
  • the core networks may include, for example, a 5G/NR core network (5GC) 530, an evolved packet core (EPC) 535 of a 4G/LTE network, a circuit switched core network (2G/3G CN) 545 of a 2G and/or 3G network, and/or the like.
  • 5GC 5G/NR core network
  • EPC evolved packet core
  • 2G/3G CN circuit switched core network
  • the gNB 510 may provide access to the 5GC 530
  • the eNB 515 may provide access to the EPC 535
  • the WLAN AP 520 may provide access to the 5GC 530 and/or the EPC 535 via an evolved packet data gateway (ePDG) and/or via a non-3GPP interworking function (N3IWF) device 540
  • the GERAN/UTRAN access node 525 may provide access to the 2G/3G CN 545.
  • network devices of the 5GC 530 and/or the EPC 535 may communicate with an Internet Protocol (IP) Multimedia Subsystem (IMS) entity 550 (e.g., for IMS registration and/or communication via an IMS protocol) .
  • IP Internet Protocol
  • IMS Internet Multimedia Subsystem
  • one or more of the gNB 510, the eNB 515, and/or the GERAN/UTRAN 525 may correspond to the base station 110 described elsewhere herein.
  • the UE 505 may correspond to the UE 120 described elsewhere herein.
  • the UE 505 may be a multi-mode UE capable of communicating via multiple radio access technologies (RATs) , such as an NR RAT (e.g., via the gNB 510, via the 5GC 530, and/or the like) , an LTE RAT (e.g., via the eNB 515 and/or the EPC 535) , a WLAN RAT (e.g., via the WLAN AP 520 and/or the ePDG/N3IWF 540) , a circuit-switched (CS) RAT (e.g., via the GERAN/UTRAN access node 525 and/or the 2G/3G CN 545) , and/or the like.
  • RATs radio access technologies
  • the NR RAT may be an NR RAT that uses an NR core network (e.g., 5GC 530) and an NR access network (e.g., via gNB 510) .
  • the NR RAT may be an NR RAT that uses an NR core network (e.g., 5GC 530) and an LTE access network (e.g., via eNB 515 and/or gNB 510) .
  • the NR RAT may be an NR RAT in a standalone (SA) mode (e.g., an NR SA mode) or a non-standalone (NSA) mode (e.g., an NR NSA mode) .
  • SA standalone
  • NSA non-standalone
  • the NR RAT and/or the LTE RAT may use an IMS protocol and/or an NAS protocol for one or more service requests.
  • the LTE RAT may be an LTE-only RAT where the eNB 515 is connected to the EPC 535 in an SA mode (e.g., an LTE SA mode) without 5G secondary carriers.
  • the LTE RAT may be an LTE NSA RAT where the eNB 515 is connected to a 5GC 530 in an LTE/NR NSA mode with 5G secondary carriers capable of being added to a 4G primary carrier, which may also be referred to as an Evolved UMTS Terrestrial Radio Access (EUTRA) -NR Dual Connectivity (ENDC) mode.
  • EUTRA Evolved UMTS Terrestrial Radio Access
  • EEC Evolved UMTS Terrestrial Radio Access
  • the CS RAT may include a 3G RAT, a 2G RAT, and/or the like.
  • Fig. 5 is provided merely as an example. Other examples may differ from what is described with regard to Fig. 5.
  • a UE may measure one or more synchronization signal blocks (SSBs) during operation.
  • the UE may measure SSBs of one or more cells to assist with a cell search, a neighbor cell search, a cell selection, a cell reselection, a handover, a serving cell beam sweeping operation, and/or the like.
  • SSBs may generally be transmitted in groups, which may be referred to as SS bursts or SS burst sets.
  • a UE may be configured with an SSB measurement timing configuration (SMTC) .
  • SMTC SSB measurement timing configuration
  • An SMTC parameter can indicate a periodicity, a time length, and/or an offset of SSB measurement occasions (e.g., occasions in which one or more base stations transmit SSBs to be measured by the UE) .
  • multiple wireless networks may be deployed within an overlapping or same area or region. Multiple network deployments in a common space can support UEs having different data requirements, communication capabilities, operator subscriptions, and/or the like. For example, an LTE network and an NR network may be deployed in a particular region by the same mobile network operator (MNO) or different MNOs. In some situations, multiple network deployment in a common area can present challenges.
  • MNO mobile network operator
  • a base station associated with the LTE network may transmit signaling (e.g., a system information block (SIB) ) to advertise one or more NR frequencies and to provide the UE with an SMTC that indicates a periodicity, a duration, and an offset of SSBs transmitted on the NR frequencies.
  • SIB system information block
  • the periodicity, duration, and offset indicated in the SMTC provided by the LTE network may be defined with respect to system frame number (SFN) zero on the LTE network.
  • UEs may use the periodicity, duration, and offset indicated in the SMTC provided by the LTE network to determine a location (e.g., a time window) in which to capture samples of the SSBs transmitted on the NR frequencies with respect to SFN zero on the LTE network.
  • a location e.g., a time window
  • the LTE network may incorrectly determine the locations or positions in which NR SSBs are transmitted, which may result in an SMTC having a periodicity, duration, and/or offset that is misconfigured with respect to the SFN on the LTE network.
  • aspects may be implemented by a UE due to an unreliable measurement time configuration, such as an SMTC provided by an LTE network that indicates a periodicity, a duration, and an offset for SSB transmissions on an NR frequency.
  • an SMTC provided by an LTE network that indicates a periodicity, a duration, and an offset for SSB transmissions on an NR frequency.
  • a UE may receive an SMTC that indicates a periodicity, duration, and offset for SSB transmissions on an NR frequency from one or more base stations associated with an LTE network, and the UE may perform a search to detect one or more SSB spans across one or more cells in the NR frequency over a first time window that corresponds to a configured periodicity associated with the NR frequency (e.g., 20 milliseconds) . Accordingly, the UE may be guaranteed to detect SSB samples from any cells that are operating on the NR frequency over the first time window.
  • a configured periodicity associated with the NR frequency e.g. 20 milliseconds
  • the UE may then determine a second time window in which to measure the one or more cells in the NR frequency depending on whether the detected SSB spans are within a time window indicated in the network-configured SMTC.
  • the second time window may have a duration and an offset determined from the network-configured SMTC if all detected SSB spans are within a time window indicated in the network-configured SMTC.
  • the second time window may be determined to cover a union of the SSB spans of all detected cells or a subset of the detected SSB spans that satisfy a threshold (e.g., having a signal strength that exceeds a threshold, is within a threshold of a network-configured reselection threshold, and/or the like) .
  • a threshold e.g., having a signal strength that exceeds a threshold, is within a threshold of a network-configured reselection threshold, and/or the like.
  • the UE may detect and measure one or more NR cells on an NR frequency even if the LTE network has misconfigured or not configured an SMTC for the NR frequency,
  • Figs. 6A-6B are diagrams illustrating one or more examples 600 of idle search and measurement modifications according to some aspects. In some instances, these may be due to an unreliable measurement time configuration.
  • example (s) 600 may include a UE 120 in communication with a first base station 110a (e.g., an eNB) that provides access to a first wireless network (e.g., an LTE network) using a first radio access technology (RAT) (e.g., LTE) .
  • RAT radio access technology
  • example (s) 600 may include a second base station 110b (e.g., a gNB) that provides access to a second wireless network (e.g., an NR network) using a second RAT (e.g., NR) .
  • a second wireless network e.g., an NR network
  • a second RAT e.g., NR
  • the UE 120 and the base stations 110 may operate in a 5G/NR standalone (SA) mode, a 5G/NR non-standalone (NSA) mode, and/or the like, as described above in connection with Fig. 5.
  • SA 5G/NR standalone
  • NSA non-standalone
  • example (s) 600 may be described herein in a context where the first RAT is an LTE RAT and the second RAT is an NR RAT, other RAT types may be used in connection with example (s) 600 described herein.
  • the second RAT may be a later generation RAT and the first RAT may be an earlier generation RAT (e.g., that assists with establishing a radio access network connection for the second RAT) , or vice versa.
  • the first base station 110a is described herein as an eNB and the second base station 110b is described herein as a gNB, other base stations 110 may be used in connection with example (s) 600 described herein.
  • the first base station 110a may be an earlier generation base station 110 and the second base station 110b may be a later generation base station 110.
  • the base station 110a may transmit, and the UE 120 may receive, signaling (e.g., a SIB) .
  • Signaling can include a network-configured SMTC, which may indicate a periodicity, an offset, and a duration for one or more SSBs that are transmitted by the second base station 110b on an NR frequency.
  • the periodicity, offset, and duration indicated in the network-configured SMTC may generally be defined with respect to SFN zero on a wireless network associated with the first base station 110a.
  • the UE 120 would perform a search to detect one or more cells and subsequently measure one or more detected cells on the NR frequency over a time window that is determined from the periodicity, offset, and duration indicated in the network-configured SMTC.
  • the network-configured SMTC may be misconfigured with incorrect values, initially configured with correct values that become incorrect over time due to drift that accumulates independently on the LTE network and the NR frequencies, and/or the like.
  • communication devices may perform an idle search and measurement procedure (e.g., an L2NR procedure) .
  • the procedure can include one or more parameters used to perform cell detection and/or measurement are independent of the network-configured SMTC.
  • the UE 120 may compute the one or more parameters to perform the cell detection and/or measurement while in idle mode, as described herein, or the UE 120 may utilize one or more parameters that the UE 120 computed while in connected mode (e.g., based on an NR measurement object and/or other suitable techniques) after transitioning from connected mode to idle mode.
  • the UE 120 may perform a search to detect one or more SSB bursts or spans.
  • the SSB signaling can be transmitted on an NR frequency over a first time window that is based at least in part on a configured periodicity for the NR frequency.
  • a configured periodicity may be a preconfigured value, such as 20 milliseconds, that is guaranteed to cover a time period in which the second base station 110b transmits SSBs regardless of the periodicity indicated in the network-configured SMTC. Any offset indicated in the network-configured SMTC may be ignored.
  • the first time window in which the UE 120 performs the search to detect the one or more SSB spans may start from SFN zero on the LTE network. Accordingly, in some aspects, the UE 120 may start to capture RF samples from SFN zero on the LTE network and continue to capture RF samples until the first time window has elapsed.
  • the second base station 110b may transmit one or more SSBs on the NR frequency according to a particular periodicity, and the periodic SSB transmissions may generally occur at some point in the first time window in which the UE 120 performs the search to detect the one or more SSB spans.
  • the UE 120 may schedule measurements on the one or more cells. Alternatively, if the UE 120 does not detect any cells during the cell search phase, the UE 120 may return to the idle mode on the LTE network and perform the cell search again at a later time.
  • the UE 120 may measure one or more cells in the NR frequency. Measurement can occur during or over a second time window.
  • This second time window may correspond to a time window that has a duration and an offset that is determined based at least in part on whether the SSB spans detected in the cell search phase (if any) are within the network-configured SSB duration.
  • the network-configured SSB duration may have a duration that is indicated in the network-configured SMTC, and may have an offset (with respect to SFN zero) that is indicated in the network-configured SMTC.
  • the second time window in which the UE 120 measures the one or more cells in the NR frequency may be determined based at least in part on the offset and duration indicated in the network-configured SMTC. Otherwise, in cases where the SSB spans detected in the cell search phase at least partially fall outside the network-configured SSB duration, the UE 120 may determine an altered duration and/or an altered offset for the second time window that covers a union of all SSB spans detected in the cell search phase.
  • the second time window may have an altered duration and/or an altered offset that is determined to cover a union of a subset of the detected SSB spans that satisfy a threshold (e.g., having a signal strength that exceeds an RSRP threshold, an RSRQ threshold, a SNIR threshold, and/or the like or is within a threshold of a reselection threshold configured by base station 110a and/or 110b, and/or the like) .
  • a threshold e.g., having a signal strength that exceeds an RSRP threshold, an RSRQ threshold, a SNIR threshold, and/or the like or is within a threshold of a reselection threshold configured by base station 110a and/or 110b, and/or the like.
  • the first time window in which the UE 120 performs a search to detect one or more SSB spans in an NR frequency may have a duration that is based at least in part on a configured periodicity for the NR frequency.
  • the first time window (which may be referred to herein as a search window) may start at SFN zero on the LTE network and may have a duration, such as 20 milliseconds, that is guaranteed to cover a time period in which the SSB spans will be transmitted regardless of a periodicity indicated in a network-configured SMTC.
  • the UE 120 may capture RF samples over the search window, whereby SSBs that are transmitted in the NR frequency anywhere within the search window may be detected by the UE 120.
  • the UE 120 may determine a second time window in which to measure the one or more cells. For example, as further shown in Fig.
  • the UE 120 may determine a network-configured SSB duration based at least in part on the duration and offset indicated in the network-configured SMTC (e.g., the network-configured SSB duration may have a duration that equals the duration indicated in the network-configured SMTC, and the offset indicated in the network-configured SMTC may define a frame boundary at which the network-configuration SSB duration begins) .
  • the UE 120 may apply the network-configured SMTC to schedule measurements on the one or more cells in the NR frequency when the SSB spans detected in the search phase are all within the SSB duration indicated in the network-configured SMTC. For example, in this case, the UE 120 may detect a first SSB transmitted by a first cell (Cell 1) and a second SSB transmitted by a second cell (Cell 2) , and the first SSB and the second SSB may be detected within SSB spans that are located within the network-configured SSB duration.
  • the network-configured SMTC may be properly aligned with the actual SSB transmissions.
  • the UE 120 may apply the periodicity, duration, and offset parameters indicated in the network-configured SMTC to measure the one or more cells in the NR frequency. But as described above, in some cases, the network-configured SMTC may be misconfigured with incorrect values (e.g., initially configured with correct values that become incorrect over time due to drift accumulation, and/or the like) . Accordingly, in some aspects, the UE 120 may configure an altered SMTC in cases where the SSB spans detected in the cell search phase at least partially fall outside the network-configured SSB duration.
  • reference number 640 illustrates a case in which detected SSB spans at least partially fall outside a network-configured SSB duration.
  • the UE 120 may detect three SSBs transmitted by three respective cells (Cell 1 through Cell 3) , and all of the SSBs are within SSB spans that are located outside the network-configured SSB duration. Accordingly, as shown by reference number 642, the UE 120 may determine an altered SSB duration that has a duration to cover a union of the detected SSB spans.
  • the UE 120 may determine an altered offset.
  • This altered offset can correspond to an LTE SFN that corresponds to a system frame boundary that is immediately prior to a start time of an earliest SSB span among the SSB spans detected in the cell search phase.
  • the UE 120 may determine a duration and an offset for the second time window, and the one or more cells may be measured over only the second time window (e.g., to conserve power that would otherwise be consumed obtaining measurements during time periods in which no SSBs are transmitted) .
  • the UE 120 may opportunistically operate one or more radio components (e.g., an RF chain, baseband, and/or the like) in a low-power state during the time gap (e.g., using a masking function) .
  • one or more radio components e.g., an RF chain, baseband, and/or the like
  • the SSB spans detected from the first cell and the second cell overlap with one another, and then there is a time gap between the end of the second SSB span and a start of the third SSB span detected from the third cell.
  • the UE 120 may operate one or more radio components in a low-power state during the time gap between the end of the second SSB span and the start of the third SSB span (e.g., a time period in which no SSBs are transmitted) .
  • the UE 120 may determine start and end times for the SSB spans detected in the cell search phase. Time determination can be based at least in part on a master information block (MIB) frame boundary and a half-frame indicator in a decoded physical broadcast channel (PBCH) payload.
  • MIB master information block
  • PBCH physical broadcast channel
  • the MIB frame boundary may indicate a most recent system frame boundary prior to transmission of the PBCH payload
  • the half-frame indicator may be set to a first value (e.g., zero) if the PBCH payload is transmitted in the first half of a frame, or to a second value (e.g., one) if the PBCH payload is transmitted in the second half of a frame.
  • the UE 120 may determine that a start time of the SSB span corresponds to the MIB frame boundary in the decoded PBCH payload.
  • the UE 120 may determine that the start time of the SSB span corresponds to the MIB frame boundary plus a time value that corresponds to a half-frame (e.g., five milliseconds in the case of a ten millisecond frame) .
  • the end time of the SSB span may be determined by summing the start time of the SSB span and a duration of the SSB span, which may be determined based at least in part on a fixed number of beams on a per-band basis and a subcarrier spacing signaled by the network (e.g., via base station 110a and/or 110b) .
  • the UE 120 may determine the SSB span using a lookup table, which in one example may be configured as follows:
  • the UE 120 may release the altered SMTC when one or more conditions are satisfied.
  • the altered SMTC may be released if the UE 120 fails to detect a cell over a configured quantity of search and/or measurement periods, if the LTE network disables L2NR reselection for the NR frequency associated with the altered SMTC, the UE 120 moves to a cell in which an SMTC is not configured for the NR frequency, after a configured time period, and/or the like.
  • the idle search and measurement modifications described herein may be applied for one or more of the SIMs and/or dependent on a status of one or more of the SIMs.
  • SIM subscriber identity modules
  • the UE 120 includes multiple SIMs that are associated with the same mobile network operator (MNO)
  • MNO mobile network operator
  • an altered duration and/or offset that is determined on an LTE stack for one of the SIMs may be applied to all of the SIMs that are associated with the same MNO.
  • the altered duration and/or offset may be applied on the LTE stack for different SIMs that are associated with different MNOs in cases where the different MNOs provide network-configured SMTCs for the same NR frequency.
  • the idle search and measurement process may be enabled, disabled, or otherwise controlled depending on a status of a service or data activity associated with a particular SIM. For example, if the UE 120 is engaged in a high-priority service associated with one SIM, such as a VoLTE call, the idle search and measurement process described herein may be disabled on the other SIM (s) until the high-priority service has ended. Additionally, or alternatively, the idle search and measurement process described herein may be disabled or throttled (e.g., performed less often) for a subscription associated with one SIM when data activity on another SIM satisfies a condition (e.g., when data activity is high, associated with a critical or high-priority application, and/or the like) .
  • a condition e.g., when data activity is high, associated with a critical or high-priority application, and/or the like
  • crowdsourcing may be applied for the information associated with the idle search and measurement modifications described herein.
  • the UE 120 may transmit information to a server on the LTE network to indicate the actual time period in which to search for and measure SSBs on certain NR frequencies.
  • the UE 120 may transmit information to the server on the LTE network to indicate that all SSB spans detected on an NR frequency are inside the network-configured SSB duration, and other UEs 120 may reference this information to determine that the network-configured SMTC is reliable without having to perform an extended cell search or independently determine whether the network-configured SMTC values are valid.
  • the UE 120 may transmit information indicating the altered values for the duration and/or offset. In this way, other UEs 120 may obtain the altered duration and/or offset values from the server without having to perform an extended cell search or independently determine the altered SMTC values. Furthermore, in some aspects, the UE 120 may receive, from the server, information indicating the duration and the offset of the second time window in which to measure the one or more cells on the NR frequency, to leverage crowdsourced information provided by other UEs.
  • the information provided to the server may be associated with a time stamp and a validity period to account for the possibility that the accuracy of the network-configured SMTC and/or the altered SMTC may vary over time (e.g., due to accumulated time drift) .
  • the UE 120 may reuse altered SMTC parameters for an NR frequency that is determined while operating on the first LTE cell after moving to the second LTE cell if the NR frequency is also a reselection frequency in the second LTE cell. For example, as described above, the UE 120 may determine an altered offset and/or an altered duration for measuring SSBs in cases where the SSB spans detected in an NR frequency at least partially fall outside the network-configured SSB duration.
  • the altered offset and/or altered duration may be determined for the NR frequency with respect to the first LTE cell, and the UE 120 may recompute the altered offset and/or altered duration for the second LTE cell based at least in part on a time delta between the first LTE cell and the second LTE cell (e.g., with respect to SFN zero in the second LTE cell) .
  • the UE 120 may efficiently determine the appropriate time period in which to search for and measure SSBs while camped on the second LTE cell, which may be asynchronous (not time-aligned) with respect to the first LTE cell, thereby conserving power that would otherwise be consumed by performing an extended initial search to capture SSB samples and determine the altered offset and/or duration for the second LTE cell. Additionally, or alternatively, the UE 120 may conserve power by scheduling the cell search phase once every N scheduling occasions (rather than performing the cell search phase in every scheduling occasion until the first cell is detected) , or by throttling the cell search to occur once in a configurable time period (e.g., once in every 30-second period) .
  • a configurable time period e.g., once in every 30-second period
  • the cell search and/or measurement process may be performed less often in cases where an inertial sensor of the UE 120 indicates that the UE 120 is stationary or has moved less than a threshold distance since a previous time when the cell search and/or measurement process was performed.
  • Figs. 6A-6B are provided as one or more examples. Other examples may differ from what is described with respect to Figs. 6A-6B.
  • Fig. 7 is a diagram illustrating an example process 700 performed, for example, by a UE, in accordance with various aspects of the present disclosure.
  • Example process 700 is an example where the UE (e.g., UE 120, UE 505, and/or the like) performs operations associated with idle search and measurement modifications due to an unreliable measurement time configuration.
  • the UE e.g., UE 120, UE 505, and/or the like
  • process 700 may include receiving, from a wireless network associated with a first RAT, an SMTC for a frequency associated with a second RAT (block 710) .
  • the UE may receive (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller/processor 280, and/or the like) , from a wireless network associated with a first RAT, an SMTC for a frequency associated with a second RAT, as described above.
  • process 700 may include detecting one or more SSB spans across one or more cells in the frequency associated with the second RAT over a first time window that is based at least in part on a configured periodicity for the frequency associated with the second RAT (block 720) .
  • the UE may detect (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller/processor 280, and/or the like) one or more SSB spans across one or more cells in the frequency associated with the second RAT over a first time window that is based at least in part on a configured periodicity for the frequency associated with the second RAT, as described above.
  • process 700 may include measuring the one or more cells in the frequency associated with the second RAT over a second time window that is determined based at least in part on whether the one or more SSB spans are within an SSB duration indicated in the SMTC received from the wireless network associated with the first RAT (block 730) .
  • the UE may measure (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller/processor 280, and/or the like) the one or more cells in the frequency associated with the second RAT over a second time window that is determined based at least in part on whether the one or more SSB spans are within an SSB duration indicated in the SMTC received from the wireless network associated with the first RAT, as described above.
  • the UE may measure (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller/processor 280, and/or the like) the one or more cells in the frequency associated with the second RAT over a second time window that is determined based at least in part on whether the one or more SSB spans are within an SSB duration indicated in the SMTC received from the wireless network associated with the first RAT, as described above.
  • Process 700 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.
  • process 700 includes setting the second time window to correspond to the SSB duration indicated in the SMTC, based at least in part on determining that the one or more SSB spans are all within the SSB duration indicated in the SMTC received from the wireless network associated with the first RAT.
  • the second time window has one or more of a duration or an offset that differs from one or more values indicated in the SMTC received from the wireless network associated with the first RAT.
  • the duration of the second time window covers a union of the one or more SSB spans detected across the one or more cells.
  • the duration of the second time window covers a union of a subset of the one or more SSB spans that satisfy a threshold.
  • the offset of the second time window is based at least in part on a system frame boundary prior to a start time of an earliest SSB span among the one or more SSB spans detected across the one or more cells.
  • process 700 includes releasing the duration or the offset of the second time window based at least in part on determining that a condition is satisfied, where the condition includes no cells having been detected in the frequency associated with the second RAT for a configured number of searches or measurements, the wireless network associated with the first RAT disabling reselection from the first RAT to the second RAT for the frequency associated with the second RAT, the UE moving to a cell in which an SMTC is not configured for the frequency associated with the second RAT, and/or the like.
  • process 700 includes transmitting, to a server on the wireless network associated with the first RAT, information indicating at least a duration and an offset of the second time window in which the one or more cells are measured.
  • process 700 includes receiving, from a server on the wireless network associated with the first RAT, information indicating at least a duration and an offset of the second time window in which the one or more cells are measured.
  • the one or more cells are measured based at least in part on a start time and an end time associated with one or more SSBs that are transmitted by the one or more cells during the one or more SSB spans.
  • process 700 includes determining the start time associated with the one or more SSBs based at least in part on a MIB boundary and a half-frame indicator in a PBCH payload transmitted by the one or more cells and determining the end time associated with the one or more SSBs based at least in part on a number of beams and a subcarrier spacing for the one or more cells in the frequency associated with the second RAT.
  • process 700 includes determining that the one or more SSB spans include multiple SSB spans with at least one time gap between a first set of SSB spans and a second set of SSB spans, and operating one or more radio components in a low-power state during at least a portion of the second time window that corresponds to the at least one time gap.
  • the second time window in which the one or more cells are measured is applied for at least two different SIMs.
  • process 700 includes performing a search to detect the one or more SSB spans while in an idle state on the wireless network associated with the first RAT.
  • the UE includes at least a first SIM and a second SIM, and the search to detect the one or more SSB spans is performed for a subscription associated with the first SIM based at least in part on one or more of a service or data activity associated with the second SIM.
  • the first RAT is an LTE RAT and the second RAT is an NR RAT.
  • process 700 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 7. Additionally, or alternatively, two or more of the blocks of process 700 may be performed in parallel.
  • ком ⁇ онент is intended to be broadly construed as hardware, firmware, or a combination of hardware and software.
  • a processor is implemented in hardware, firmware, or a combination of hardware and software.
  • satisfying a threshold may, depending on the context, refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, and/or the like.
  • “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c) .
  • the terms “has, ” “have, ” “having, ” and/or the like are intended to be open-ended terms. Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise.

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

Abstract

La présente divulgation concerne de manière générale, selon certains aspects, la communication sans fil. Selon certains aspects, un équipement utilisateur (EU) peut recevoir, à partir d'un réseau sans fil associé à une première technologie d'accès radio (RAT), une configuration temporelle de mesure (SMTC) de bloc de signal de synchronisation (SSB) pour une fréquence associée à une seconde RAT. L'EU peut détecter une ou plusieurs portées SSB à travers une ou plusieurs cellules dans la fréquence associée à la seconde RAT sur une première fenêtre temporelle qui est basée au moins en partie sur une périodicité configurée pour la fréquence associée à la seconde RAT. L'EU peut mesurer la ou les cellules dans la fréquence associée à la seconde RAT sur une seconde fenêtre temporelle qui est déterminée sur la base, au moins en partie, du fait que la ou les portées SSB sont dans une durée SSB indiquée dans la SMTC reçue. De nombreux autres aspects sont fournis.
PCT/CN2020/070639 2020-01-07 2020-01-07 Recherche inactive et modifications de mesure dues à une configuration de temps de mesure non fiable WO2021138798A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023197220A1 (fr) * 2022-04-13 2023-10-19 北京小米移动软件有限公司 Procédé et appareil de mesure de cellule voisine, dispositif, et support de stockage

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019193125A1 (fr) * 2018-04-05 2019-10-10 Telefonaktiebolaget Lm Ericsson (Publ) Partage configurable entre des mesures intra- et inter-fréquences
WO2019215328A1 (fr) * 2018-05-11 2019-11-14 Nokia Technologies Oy Appareils et procédés de priorisation entre un canal partagé de liaison descendante physique et une réception de bloc de signal de synchronisation
CN110557976A (zh) * 2018-03-30 2019-12-10 联发科技股份有限公司 无线通信系统的基于间隔的小区测量
CN110574328A (zh) * 2017-03-08 2019-12-13 三星电子株式会社 用于在无线通信系统中处理参考信号的方法和装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110574328A (zh) * 2017-03-08 2019-12-13 三星电子株式会社 用于在无线通信系统中处理参考信号的方法和装置
CN110557976A (zh) * 2018-03-30 2019-12-10 联发科技股份有限公司 无线通信系统的基于间隔的小区测量
WO2019193125A1 (fr) * 2018-04-05 2019-10-10 Telefonaktiebolaget Lm Ericsson (Publ) Partage configurable entre des mesures intra- et inter-fréquences
WO2019215328A1 (fr) * 2018-05-11 2019-11-14 Nokia Technologies Oy Appareils et procédés de priorisation entre un canal partagé de liaison descendante physique et une réception de bloc de signal de synchronisation

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Requirements for support of radio resource management (FDD) (Release 15)", 3GPP STANDARD; TECHNICAL SPECIFICATION; 3GPP TS 25.133, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG4, no. V15.1.0, 17 January 2018 (2018-01-17), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, pages 1 - 410, XP051392698 *
LG ELECTRONICS: "Discussion on measurement of SFTD for EN-DC", 3GPP DRAFT; R4-1802423 DISCUSSION ON MEASUREMENT OF SFTD FOR EN-DC-R1, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG4, no. Athens , Greece; 20180226 - 20180302, 19 February 2018 (2018-02-19), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP051402609 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023197220A1 (fr) * 2022-04-13 2023-10-19 北京小米移动软件有限公司 Procédé et appareil de mesure de cellule voisine, dispositif, et support de stockage

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