WO2021227007A1 - Saut de cellules non autonomes pour sélection de cellule autonome - Google Patents

Saut de cellules non autonomes pour sélection de cellule autonome Download PDF

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Publication number
WO2021227007A1
WO2021227007A1 PCT/CN2020/090511 CN2020090511W WO2021227007A1 WO 2021227007 A1 WO2021227007 A1 WO 2021227007A1 CN 2020090511 W CN2020090511 W CN 2020090511W WO 2021227007 A1 WO2021227007 A1 WO 2021227007A1
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Prior art keywords
cell
cells
list
nsa
initial
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PCT/CN2020/090511
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English (en)
Inventor
Jiaheng LIU
Huan Xu
Shanshan Wang
Yongle WU
Shraddha Ramachandra Phadnis
Sindhu SATYAN
Sunitha Sundaram
Thomas James Christol
Ramesh Chandra Chirala
Yue HONG
Yuhua Chen
Tie CHEN
Shan QING
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Qualcomm Incorporated
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Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2020/090511 priority Critical patent/WO2021227007A1/fr
Publication of WO2021227007A1 publication Critical patent/WO2021227007A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point

Definitions

  • aspects of the present disclosure relate to wireless communications, and more particularly, to mechanisms for skipping non-standalone (NSA) cells during cell selection, which may allow the UE to detect and camp on a standalone (SA) cell.
  • NSA non-standalone
  • 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) .
  • 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, and time division synchronous code division multiple access (TD-SCDMA) systems.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • a wireless multiple-access communication system may include a number of base stations, each simultaneously supporting communication for multiple communication devices, otherwise known as user equipment (UEs) .
  • UEs user equipment
  • a set of one or more base stations may define an eNodeB (eNB) .
  • eNB eNodeB
  • a wireless multiple access communication system may include a number of distributed units (DUs) (e.g., edge units (EUs) , edge nodes (ENs) , radio heads (RHs) , smart radio heads (SRHs) , transmission reception points (TRPs) , etc.
  • DUs distributed units
  • EUs edge units
  • ENs edge nodes
  • RHs radio heads
  • SSRHs smart radio heads
  • TRPs transmission reception points
  • CUs central units
  • CUs central units
  • CNs central nodes
  • ANCs access node controllers
  • a set of one or more distributed units, in communication with a central unit may define an access node (e.g., a new radio base station (NR BS) , a new radio node-B (NR NB) , a network node, 5G NB, gNB, gNodeB, etc. ) .
  • NR BS new radio base station
  • NR NB new radio node-B
  • network node 5G NB, gNB, gNodeB, etc.
  • a base station or DU may communicate with a set of UEs on downlink channels (e.g., for transmissions from a base station or to a UE) and uplink channels (e.g., for transmissions from a UE to a base station or distributed unit) .
  • downlink channels e.g., for transmissions from a base station or to a UE
  • uplink channels e.g., for transmissions from a UE to a base station or distributed unit
  • NR new radio
  • 3GPP Third Generation Partnership Project
  • NR-DC Dual Connectivity
  • a UE may be desired to enter a non-activated state in relation to the network to reduce power consumption. This objective may conflict with the desire to maintain a timing alignment with the network such that the UE may quickly return to the activated state.
  • the improvements in NR technology resolving the example problem mentioned should be applicable to other multi-access technologies and the telecommunication standards that employ these technologies.
  • aspects of the present disclosure relate to wireless communications, and more particularly, to detecting data inactivity and expediting recovery action.
  • Certain aspects of the present disclosure provide a method for wireless communications.
  • the method generally includes identifying, during an initial cell search procedure, a first cell of a first type that the UE is not able to camp on, adding the identified cell to a list of cells to avoid during the initial cell search procedure, retrying the initial cell search procedure, skipping cells on the list, and camping on a second cell of a second type identified during the retried initial cell search.
  • FIG. 1 is a block diagram conceptually illustrating an example telecommunications system, in accordance with certain aspects of the present disclosure.
  • FIG. 2 is a block diagram illustrating an example logical architecture of a distributed RAN, in accordance with certain aspects of the present disclosure.
  • FIG. 3 is a diagram illustrating an example physical architecture of a distributed RAN, in accordance with certain aspects of the present disclosure.
  • FIG. 4 is a block diagram conceptually illustrating a design of an example BS and UE, in accordance with certain aspects of the present disclosure.
  • FIG. 5 is a diagram showing examples for implementing a communication protocol stack, in accordance with certain aspects of the present disclosure.
  • FIG. 6 illustrates an example of a frame format for a new radio (NR) system, in accordance with certain aspects of the present disclosure.
  • NR new radio
  • FIG. 7 illustrates how different synchronization signal blocks (SSBs) may be sent using different beams, in accordance with certain aspects of the present disclosure.
  • SSBs synchronization signal blocks
  • FIG. 8 shows an exemplary transmission resource mapping, according to aspects of the present disclosure.
  • FIG. 9 illustrates example operations for wireless communications by a user equipment (UE) , in accordance with aspects of the present disclosure.
  • UE user equipment
  • FIG. 10 is a flow diagram for cell search in a hybrid network, in accordance with aspects of the present disclosure.
  • FIG. 11 is a call flow diagram for cell search in a hybrid network, in accordance with aspects of the present disclosure
  • aspects of the present disclosure relate to wireless communications, and more particularly, to mechanisms for skipping non-standalone (NSA) cells during cell selection, which may allow the UE to detect and camp on a standalone (SA) cell.
  • the mechanisms may be used in scenarios, such as hybrid NR systems that include both NR SA and NR NSA cells.
  • NR may support various wireless communication services, such as Enhanced mobile broadband (eMBB) targeting wide bandwidth (e.g. 80 MHz beyond) , millimeter wave (mmW) targeting high carrier frequency (e.g. 60 GHz) , massive MTC (mMTC) targeting non-backward compatible MTC techniques, and/or mission critical targeting ultra-reliable low latency communications (URLLC) .
  • eMBB Enhanced mobile broadband
  • mmW millimeter wave
  • mMTC massive MTC
  • URLLC ultra-reliable low latency communications
  • These services may include latency and reliability requirements.
  • These services may also have different transmission time intervals (TTI) to meet respective quality of service (QoS) requirements.
  • TTI transmission time intervals
  • QoS quality of service
  • these services may co-exist in the same subframe.
  • a CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA) , cdma2000, etc.
  • UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA.
  • cdma2000 covers IS-2000, IS-95 and IS-856 standards.
  • a TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM) .
  • An OFDMA network may implement a radio technology such as NR (e.g.
  • E-UTRA Evolved UTRA
  • UMB Ultra Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • IEEE 802.16 WiMAX
  • IEEE 802.20 Flash-OFDMA
  • UMTS Universal Mobile Telecommunication System
  • NR is an emerging wireless communications technology under development in conjunction with the 5G Technology Forum (5GTF) .
  • 3GPP Long Term Evolution (LTE) and LTE-Advanced (LTE-A) are releases of UMTS that use E-UTRA.
  • UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described in documents from an organization named “3rd Generation Partnership Project” (3GPP) .
  • cdma2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) .
  • the techniques described herein may be used for the wireless networks and radio technologies mentioned above as well as other wireless networks and radio technologies. For clarity, while aspects may be described herein using terminology commonly associated with 3G and/or 4G wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems, such as 5G and later, including NR technologies.
  • FIG. 1 illustrates an example wireless network 100 in which aspects of the present disclosure may be performed.
  • one or more UEs 120 of the wireless network 100 may be configured to perform operations 900 of FIG. 9 to detect and skip NSA cells during a cell selection procedure, allowing the UE to detect (and camp on) an SA cell.
  • the wireless network 100 may include a number of BSs 110 and other network entities.
  • a BS may be a station that communicates with UEs.
  • Each BS 110 may provide communication coverage for a particular geographic area.
  • the term “cell” can refer to a coverage area of a Node B and/or a Node B subsystem serving this coverage area, depending on the context in which the term is used.
  • the term “cell” and gNB, Node B, 5G NB, AP, NR BS, NR BS, or TRP may be interchangeable.
  • a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile base station.
  • the base stations may be interconnected to one another and/or to one or more other base stations 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, or the like using any suitable transport network.
  • any number of wireless networks may be deployed in a given geographic area.
  • Each wireless network may support a particular radio access technology (RAT) and may operate on one or more frequencies.
  • a RAT may also be referred to as a radio technology, an air interface, etc.
  • a frequency may also be referred to as a carrier, a frequency channel, etc.
  • Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
  • NR or 5G RAT networks may be deployed.
  • a BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or other types of cell.
  • a macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription.
  • a pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription.
  • a femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs having association with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG) , UEs for users in the home, etc. ) .
  • CSG Closed Subscriber Group
  • a BS for a macro cell may be referred to as a macro BS.
  • a BS for a pico cell may be referred to as a pico BS.
  • a BS for a femto cell may be referred to as a femto BS or a home BS.
  • the BSs 110a, 110b and 110c may be macro BSs for the macro cells 102a, 102b and 102c, respectively.
  • the BS 110x may be a pico BS for a pico cell 102x.
  • the BSs 110y and 110z may be femto BS for the femto cells 102y and 102z, respectively.
  • a BS may support one or multiple (e.g., three) cells.
  • the wireless network 100 may also include relay stations.
  • a relay station is a station that receives a transmission of data and/or other information from an upstream station (e.g., a BS or a UE) and sends a transmission of the data and/or other information to a downstream station (e.g., a UE or a BS) .
  • a relay station may also be a UE that relays transmissions for other UEs.
  • a relay station 110r may communicate with the BS 110a and a UE 120r to facilitate communication between the BS 110a and the UE 120r.
  • a relay station may also be referred to as a relay BS, a relay, etc.
  • the wireless network 100 may be a heterogeneous network that includes BSs of different types, e.g., macro BS, pico BS, femto BS, relays, etc. These different types of BSs may have different transmit power levels, different coverage areas, and different impact on interference in the wireless network 100.
  • macro BS may have a high transmit power level (e.g., 20 Watts) whereas pico BS, femto BS, and relays may have a lower transmit power level (e.g., 1 Watt) .
  • the wireless network 100 may support synchronous or asynchronous operation.
  • the BSs may have similar frame timing, and transmissions from different BSs may be approximately aligned in time.
  • the BSs may have different frame timing, and transmissions from different BSs may not be aligned in time.
  • the techniques described herein may be used for both synchronous and asynchronous operation.
  • a network controller 130 may couple to a set of BSs and provide coordination and control for these BSs.
  • the network controller 130 may communicate with the BSs 110 via a backhaul.
  • the BSs 110 may also communicate with one another, e.g., directly or indirectly via wireless or wireline backhaul.
  • the UEs 120 may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile.
  • a UE may also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a Customer Premises Equipment (CPE) , a cellular phone, a smart phone, a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or medical equipment, a biometric sensor/device, a wearable device such as a smart watch, smart clothing, smart glasses, a smart wrist band, smart jewelry (e.g., a smart ring, a smart bracelet, etc.
  • MTC machine-type communication
  • eMTC evolved MTC
  • MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., that may communicate with a BS, another device (e.g., remote device) , or some other entity.
  • a wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link.
  • a network e.g., a wide area network such as Internet or a cellular network
  • Some UEs may be considered Internet-of-Things (IoT) devices.
  • IoT Internet-of-Things
  • a solid line with double arrows indicates desired transmissions between a UE and a serving BS, which is a BS designated to serve the UE on the downlink and/or uplink.
  • a dashed line with double arrows indicates interfering transmissions between a UE and a BS.
  • Certain wireless networks utilize orthogonal frequency division multiplexing (OFDM) on the downlink and single-carrier frequency division multiplexing (SC-FDM) on the uplink.
  • OFDM and SC-FDM partition the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, bins, etc.
  • K orthogonal subcarriers
  • Each subcarrier may be modulated with data.
  • modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDM.
  • the spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may be dependent on the system bandwidth.
  • the spacing of the subcarriers may be 15 kHz and the minimum resource allocation (called a ‘resource block’ ) may be 12 subcarriers (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.
  • aspects of the examples described herein may be associated with LTE technologies, aspects of the present disclosure may be applicable with other wireless communications systems, such as NR.
  • NR may utilize OFDM with a CP on the uplink and downlink and include support for half-duplex operation using TDD.
  • a single component carrier bandwidth of 100 MHz may be supported.
  • NR resource blocks may span 12 sub-carriers with a sub-carrier bandwidth of 75 kHz over a 0.1 ms duration.
  • each radio frame may consist of 50 subframes with a length of 10 ms. Consequently, each subframe may have a length of 0.2 ms.
  • each radio frame may consist of 10 subframes with a length of 10 ms, where each subframe may have a length of 1 ms.
  • Each subframe may indicate a link direction (i.e., DL or UL) for data transmission and the link direction for each subframe may be dynamically switched.
  • Each subframe may include DL/UL data as well as DL/UL control data.
  • UL and DL subframes for NR may be as described in more detail below with respect to FIGs. 6 and 7.
  • Beamforming may be supported and beam direction may be dynamically configured.
  • MIMO transmissions with precoding may also be supported.
  • MIMO configurations in the DL may support up to 8 transmit antennas with multi-layer DL transmissions up to 8 streams and up to 2 streams per UE. Multi-layer transmissions with up to 2 streams per UE may be supported. Aggregation of multiple cells may be supported with up to 8 serving cells.
  • NR may support a different air interface, other than an OFDM-based.
  • NR networks may include entities such CUs and/or DUs.
  • a scheduling entity e.g., a base station
  • the scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, subordinate entities utilize resources allocated by the scheduling entity.
  • Base stations are not the only entities that may function as a scheduling entity. That is, in some examples, a UE may function as a scheduling entity, scheduling resources for one or more subordinate entities (e.g., one or more other UEs) .
  • the UE is functioning as a scheduling entity, and other UEs utilize resources scheduled by the UE for wireless communication.
  • a UE may function as a scheduling entity in a peer-to-peer (P2P) network, and/or in a mesh network.
  • P2P peer-to-peer
  • UEs may optionally communicate directly with one another in addition to communicating with the scheduling entity.
  • a scheduling entity and one or more subordinate entities may communicate utilizing the scheduled resources.
  • a RAN may include a CU and DUs.
  • a NR BS e.g., gNB, 5G Node B, Node B, transmission reception point (TRP) , access point (AP)
  • NR cells can be configured as access cells (ACells) or data only cells (DCells) .
  • the RAN e.g., a central unit or distributed unit
  • DCells may be cells used for carrier aggregation or dual connectivity, but not used for initial access, cell selection/reselection, or handover. In some cases, DCells may not transmit synchronization signals –in some case cases DCells may transmit SS.
  • NR BSs may transmit downlink signals to UEs indicating the cell type. Based on the cell type indication, the UE may communicate with the NR BS. For example, the UE may determine NR BSs to consider for cell selection, access, handover, and/or measurement based on the indicated cell type.
  • FIG. 2 illustrates an example logical architecture of a distributed radio access network (RAN) 200, which may be implemented in the wireless communication system illustrated in FIG. 1.
  • a 5G access node 206 may include an access node controller (ANC) 202.
  • the ANC may be a central unit (CU) of the distributed RAN 200.
  • the backhaul interface to the next generation core network (NG-CN) 204 may terminate at the ANC.
  • the backhaul interface to neighboring next generation access nodes (NG ANs) may terminate at the ANC.
  • the ANC may include one or more TRPs 208 (which may also be referred to as BSs, NR BSs, Node Bs, 5G NBs, APs, or some other term) .
  • TRPs 208 which may also be referred to as BSs, NR BSs, Node Bs, 5G NBs, APs, or some other term.
  • TRP may be used interchangeably with “cell. ”
  • the TRPs 208 may be a DU.
  • the TRPs may be connected to one ANC (ANC 202) or more than one ANC (not illustrated) .
  • ANC ANC
  • RaaS radio as a service
  • a TRP may include one or more antenna ports.
  • the TRPs may be configured to individually (e.g., dynamic selection) or jointly (e.g., joint transmission) serve traffic to a UE.
  • the local architecture 200 may be used to illustrate fronthaul definition.
  • the architecture may be defined that support fronthauling solutions across different deployment types.
  • the architecture may be based on transmit network capabilities (e.g., bandwidth, latency, and/or jitter) .
  • the architecture may share features and/or components with LTE.
  • the next generation AN (NG-AN) 210 may support dual connectivity with NR.
  • the NG-AN may share a common fronthaul for LTE and NR.
  • the architecture may enable cooperation between and among TRPs 208. For example, cooperation may be preset within a TRP and/or across TRPs via the ANC 202. According to aspects, no inter-TRP interface may be needed/present.
  • a dynamic configuration of split logical functions may be present within the architecture 200.
  • the Radio Resource Control (RRC) layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, Medium Access Control (MAC) layer, and a Physical (PHY) layers may be adaptably placed at the DU or CU (e.g., TRP or ANC, respectively) .
  • a BS may include a central unit (CU) (e.g., ANC 202) and/or one or more distributed units (e.g., one or more TRPs 208) .
  • CU central unit
  • distributed units e.g., one or more TRPs 208 .
  • FIG. 3 illustrates an example physical architecture of a distributed RAN 300, according to aspects of the present disclosure.
  • a centralized core network unit (C-CU) 302 may host core network functions.
  • the C-CU may be centrally deployed.
  • C-CU functionality may be offloaded (e.g., to advanced wireless services (AWS) ) , to handle peak capacity.
  • AWS advanced wireless services
  • a centralized RAN unit (C-RU) 304 may host one or more ANC functions.
  • the C-RU may host core network functions locally.
  • the C-RU may have distributed deployment.
  • the C-RU may be closer to the network edge.
  • a DU 306 may host one or more TRPs (edge node (EN) , an edge unit (EU) , a radio head (RH) , a smart radio head (SRH) , or the like) .
  • the DU may be located at edges of the network with radio frequency (RF) functionality.
  • RF radio frequency
  • FIG. 4 illustrates example components of the BS 110 and UE 120 illustrated in FIG. 1, which may be used to implement aspects of the present disclosure.
  • the BS may include a TRP or gNB.
  • antennas 452, DEMOD/MOD 454, processors 466, 458, 464, and/or controller/processor 480 of the UE 120 may be used to perform operations 800 of FIG. 8 to detect and recover from data stalls when operating in a dual connectivity mode.
  • the base station 110 may be the macro BS 110c in FIG. 1, and the UE 120 may be the UE 120y.
  • the base station 110 may also be a base station of some other type.
  • the base station 110 may be equipped with antennas 434a through 434t, and the UE 120 may be equipped with antennas 452a through 452r.
  • a transmit processor 420 may receive data from a data source 412 and control information from a controller/processor 440.
  • the control information may be for the Physical Broadcast Channel (PBCH) , Physical Control Format Indicator Channel (PCFICH) , Physical Hybrid ARQ Indicator Channel (PHICH) , Physical Downlink Control Channel (PDCCH) , etc.
  • the data may be for the Physical Downlink Shared Channel (PDSCH) , etc.
  • the processor 420 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively.
  • the processor 420 may also generate reference symbols, e.g., for the PSS, SSS, and cell-specific reference signal (CRS) .
  • reference symbols e.g., for the PSS, SSS, and cell-specific reference signal (CRS) .
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 430 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) 432a through 432t.
  • Each modulator 432 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream.
  • Each modulator 432 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • Downlink signals from modulators 432a through 432t may be transmitted via the antennas 434a through 434t, respectively.
  • the antennas 452a through 452r may receive the downlink signals from the base station 110 and may provide received signals to the demodulators (DEMODs) 454a through 454r, respectively.
  • Each demodulator 454 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples.
  • Each demodulator 454 may further process the input samples (e.g., for OFDM, etc. ) to obtain received symbols.
  • a MIMO detector 456 may obtain received symbols from all the demodulators 454a through 454r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 458 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 120 to a data sink 460, and provide decoded control information to a controller/processor 480.
  • a transmit processor 464 may receive and process data (e.g., for the Physical Uplink Shared Channel (PUSCH) ) from a data source 462 and control information (e.g., for the Physical Uplink Control Channel (PUCCH) from the controller/processor 480.
  • the transmit processor 464 may also generate reference symbols for a reference signal.
  • the symbols from the transmit processor 464 may be precoded by a TX MIMO processor 466 if applicable, further processed by the demodulators 454a through 454r (e.g., for SC-FDM, etc. ) , and transmitted to the base station 110.
  • the uplink signals from the UE 120 may be received by the antennas 434, processed by the modulators 432, detected by a MIMO detector 436 if applicable, and further processed by a receive processor 438 to obtain decoded data and control information sent by the UE 120.
  • the receive processor 438 may provide the decoded data to a data sink 439 and the decoded control information to the controller/processor 440.
  • the controllers/processors 440 and 480 may direct the operation at the base station 110 and the UE 120, respectively.
  • a scheduler 444 may schedule UEs for data transmission on the downlink and/or uplink.
  • the processor 480 and/or other processors and modules at the UE 120 may perform or direct, e.g., the execution of the operations 800 (functional blocks) illustrated in FIG. 9 and/or other processes for the techniques described herein and those illustrated in the appended drawings.
  • the memories 442 and 482 may store data and program codes for the BS 110 and the UE 120, respectively.
  • FIG. 5 illustrates a diagram 500 showing examples for implementing a communications protocol stack, according to aspects of the present disclosure.
  • the illustrated communications protocol stacks may be implemented by devices operating in a 5G system.
  • Diagram 500 illustrates a communications protocol stack including a Radio Resource Control (RRC) layer 510, a Packet Data Convergence Protocol (PDCP) layer 515, a Radio Link Control (RLC) layer 520, a Medium Access Control (MAC) layer 525, and a Physical (PHY) layer 530.
  • RRC Radio Resource Control
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Medium Access Control
  • PHY Physical
  • the layers of a protocol stack may be implemented as separate modules of software, portions of a processor or ASIC, portions of non-collocated devices connected by a communications link, or various combinations thereof. Collocated and non-collocated implementations may be used, for example, in a protocol stack for a network access device (e.g., AN
  • a first option 505-a shows a split implementation of a protocol stack, in which implementation of the protocol stack is split between a centralized network access device (e.g., an ANC 202 in FIG. 2) and distributed network access device (e.g., DU 208 in FIG. 2) .
  • a centralized network access device e.g., an ANC 202 in FIG. 2
  • distributed network access device e.g., DU 208 in FIG. 2
  • an RRC layer 510 and a PDCP layer 515 may be implemented by the central unit
  • an RLC layer 520, a MAC layer 525, and a PHY layer 530 may be implemented by the DU.
  • the CU and the DU may be collocated or non-collocated.
  • the first option 505-a may be useful in a macro cell, micro cell, or pico cell deployment.
  • a second option 505-b shows a unified implementation of a protocol stack, in which the protocol stack is implemented in a single network access device (e.g., access node (AN) , new radio base station (NR BS) , a new radio Node-B (NR NB) , a network node (NN) , or the like. ) .
  • the RRC layer 510, the PDCP layer 515, the RLC layer 520, the MAC layer 525, and the PHY layer 530 may each be implemented by the AN.
  • the second option 505-b may be useful in a femto cell deployment.
  • a UE may implement an entire protocol stack (e.g., the RRC layer 510, the PDCP layer 515, the RLC layer 520, the MAC layer 525, and the PHY layer 530) .
  • an entire protocol stack e.g., the RRC layer 510, the PDCP layer 515, the RLC layer 520, the MAC layer 525, and the PHY layer 530.
  • FIG. 6 is a diagram showing an example of a frame format 600 for NR.
  • the transmission timeline for each of the downlink and uplink may be partitioned into units of radio frames.
  • Each radio frame may have a predetermined duration (e.g., 10 ms) and may be partitioned into 10 subframes, each of 1 ms, with indices of 0 through 9.
  • Each subframe may include a variable number of slots depending on the subcarrier spacing.
  • Each slot may include a variable number of symbol periods (e.g., 7 or 14 symbols) depending on the subcarrier spacing.
  • the symbol periods in each slot may be assigned indices.
  • a mini-slot which may be referred to as a sub-slot structure, refers to a transmit time interval having a duration less than a slot (e.g., 2, 3, or 4 symbols) .
  • Each symbol in a slot may indicate a link direction (e.g., DL, UL, or flexible) for data transmission and the link direction for each subframe may be dynamically switched.
  • the link directions may be based on the slot format.
  • Each slot may include DL/UL data as well as DL/UL control information.
  • a synchronization signal (SS) block is transmitted.
  • the SS block includes a PSS, a SSS, and a two symbol PBCH.
  • the SS block can be transmitted in a fixed slot location, such as the symbols 0-3 as shown in FIG. 6.
  • the PSS and SSS may be used by UEs for cell search and acquisition.
  • the PSS may provide half-frame timing, the SS may provide the CP length and frame timing.
  • the PSS and SSS may provide the cell identity.
  • the PBCH carries some basic system information, such as downlink system bandwidth, timing information within radio frame, SS burst set periodicity, system frame number, etc.
  • the SS blocks may be organized into SS bursts to support beam sweeping. Further system information such as, remaining minimum system information (RMSI) , system information blocks (SIBs) , other system information (OSI) can be transmitted on a physical downlink shared channel (PDSCH) in certain subframes.
  • RMSI remaining minimum
  • the SS blocks may be organized into SS burst sets to support beam sweeping.
  • each SSB within a burst set may be transmitted using a different beam, which may help a UE quickly acquire both transmit (Tx) and receive (Rx) beams (particular for mmW applications) .
  • a physical cell identity (PCI) may still decoded from the PSS and SSS of the SSB.
  • Certain deployment scenarios may include one or both NR deployment options. Some may be configured for non-standalone (NSA) and/or standalone (SA) option.
  • a standalone cell may need to broadcast both SSB and remaining minimum system information (RMSI) , for example, with SIB1 and SIB2.
  • RMSI remaining minimum system information
  • a non-standalone cell may only need to broadcast SSB, without broadcasting RMSI.
  • multiple SSBs may be sent in different frequencies, and may include the different types of SSB.
  • Control Resource Sets (CORESETs)
  • a control resource set (CORESET) for an OFDMA system may comprise one or more control resource (e.g., time and frequency resources) sets, configured for conveying PDCCH, within the system bandwidth.
  • control resource e.g., time and frequency resources
  • search spaces e.g., common search space (CSS) , UE-specific search space (USS) , etc.
  • search spaces are generally areas or portions where a communication device (e.g., a UE) may look for control information.
  • a CORESET is a set of time and frequency domain resources, defined in units of resource element groups (REGs) .
  • Each REG may comprise a fixed number (e.g., twelve) tones in one symbol period (e.g., a symbol period of a slot) , where one tone in one symbol period is referred to as a resource element (RE) .
  • a fixed number of REGs may be included in a control channel element (CCE) .
  • CCE control channel element
  • Sets of CCEs may be used to transmit new radio PDCCHs (NR-PDCCHs) , with different numbers of CCEs in the sets used to transmit NR-PDCCHs using differing aggregation levels.
  • Multiple sets of CCEs may be defined as search spaces for UEs, and thus a NodeB or other base station may transmit an NR-PDCCH to a UE by transmitting the NR-PDCCH in a set of CCEs that is defined as a decoding candidate within a search space for the UE, and the UE may receive the NR-PDCCH by searching in search spaces for the UE and decoding the NR-PDCCH transmitted by the NodeB.
  • Operating characteristics of a NodeB or other base station in an NR communications system may be dependent on a frequency range (FR) in which the system operates.
  • a frequency range may comprise one or more operating bands (e.g., “n1” band, “n2” band, “n7” band, and “n41” band) , and a communications system (e.g., one or more NodeBs and UEs) may operate in one or more operating bands.
  • Frequency ranges and operating bands are described in more detail in “Base Station (BS) radio transmission and reception” TS38.104 (Release 15) , which is available from the 3GPP website.
  • a CORESET is a set of time and frequency domain resources.
  • the CORESET can be configured for conveying PDCCH within system bandwidth.
  • a UE may determine a CORESET and monitors the CORESET for control channels.
  • a UE may identify an initial CORESET (CORESET #0) configuration from a field (e.g., pdcchConfigSIB1) in a maser information block (MIB) .
  • This initial CORESET may then be used to configure the UE (e.g., with other CORESETs and/or bandwidth parts via dedicated (UE-specific) signaling.
  • the UE When the UE detects a control channel in the CORESET, the UE attempts to decode the control channel and communicates with the transmitting BS (e.g., the transmitting cell) according to the control data provided in the control channel (e.g., transmitted via the CORESET) .
  • the transmitting BS e.g., the transmitting cell
  • the UE may receive a master information block (MIB) .
  • the MIB can be in a synchronization signal and physical broadcast channel (SS/PBCH) block (e.g., in the PBCH of the SS/PBCH block) on a synchronization raster (sync raster) .
  • SS/PBCH synchronization signal and physical broadcast channel
  • the sync raster may correspond to an SSB.
  • the UE may determine an operating band of the cell. Based on a cell’s operation band, the UE may determine a minimum channel bandwidth and a subcarrier spacing (SCS) of the channel.
  • SCS subcarrier spacing
  • the UE may then determine an index from the MIB (e.g., four bits in the MIB, conveying an index in a range 0-15) .
  • the UE may look up or locate a CORESET configuration (this initial CORESET configured via the MIB is generally referred to as CORESET #0) . This may be accomplished from one or more tables of CORESET configurations. These configurations (including single table scenarios) may include various subsets of indices indicating valid CORESET configurations for various combinations of minimum channel bandwidth and SCS. In some arrangements, each combination of minimum channel bandwidth and SCS may be mapped to a subset of indices in the table.
  • the UE may select a search space CORESET configuration table from several tables of CORESET configurations. These configurations can be based on a minimum channel bandwidth and SCS.
  • the UE may then look up a CORESET configuration (e.g., a Type0-PDCCH search space CORESET configuration) from the selected table, based on the index.
  • the UE may then determine the CORESET to be monitored (as mentioned above) based on the location (in time and frequency) of the SS/PBCH block and the CORESET configuration.
  • FIG. 8 shows an exemplary transmission resource mapping 800, according to aspects of the present disclosure.
  • a BS e.g., BS 110a, shown in FIG. 1 transmits an SS/PBCH block 802.
  • the SS/PBCH block includes a MIB conveying an index to a table that relates the time and frequency resources of the CORESET 804 to the time and frequency resources of the SS/PBCH block.
  • the BS may also transmit control signaling.
  • the BS may also transmit a PDCCH to a UE (e.g., UE 120, shown in FIG. 1) in the (time/frequency resources of the) CORESET.
  • the PDCCH may schedule a PDSCH 806.
  • the BS then transmits the PDSCH to the UE.
  • the UE may receive the MIB in the SS/PBCH block, determine the index, look up a CORESET configuration based on the index, and determine the CORESET from the CORESET configuration and the SS/PBCH block.
  • the UE may then monitor the CORESET, decode the PDCCH in the CORESET, and receive the PDSCH that was allocated by the PDCCH.
  • each configuration may indicate a number of resource blocks (e.g., 24, 48, or 96) , a number of symbols (e.g., 1-3) , as well as an offset (e.g., 0-38 RBs) that indicates a location in frequency.
  • resource blocks e.g., 24, 48, or 96
  • symbols e.g., 1-3
  • offset e.g., 0-38 RBs
  • aspects of the present disclosure relate to wireless communications, and more particularly, to mechanisms for skipping non-standalone (NSA) cells during cell selection, which may allow the UE to detect and camp on a standalone (SA) cell.
  • the mechanisms may be used in scenarios, such as hybrid NR systems that include both NR SA and NR NSA cells.
  • NSA generally refers to a cell where the radio access is 5G NR and the core network is LTE
  • SA generally refers to a cell where radio access is 5G NR and the network core is also 5G.
  • FR4 e.g., 52.6 GHz –114.25 GHz
  • FR2 24.25 GHz to 52.6 GHz
  • the slot length is 125 ⁇ Sec
  • FR4 with 960 kHz the slot length is 15.6 ⁇ Sec.
  • FR2x a frequency band referred to as FR2x may be used.
  • a UE may take a long time to camp find a SA cell to camp on.
  • the UE may be situated in the same frequency with strong NSA cells, but weak SA cells.
  • NSA SSBs may be stronger due to the typical placement of NSA cells, in an effort to roll out 5G NR services faster. This lack of decoding may be due to a processing limitation of the UE or due to an optimized design, where the UE tries to balance the time spent on one frequency relative to the coverage it provides across frequencies.
  • the UE may determine that a control resource set for Type0-PDCCH common search space is present, allowing the UE to decode a SIB1.
  • the Type0-PDCCH common search space is only present if an SSB subcarrier offset parameter, referred to as K SSB , is below a certain value.
  • K SSB generally indicates a frequency domain offset between an SSB and the overall resource block grid in number of subcarriers.
  • the value range provided above is from 0 to 15 but for FR1 case K SSB is 0 to 23 and for FR2 case K SSB is 0 to 11, values outside of this range indicate Type0-PDCCH common search space (and SIB1) is not present.
  • the UE may determine the value of K SSB from information in the master information block (MIB) .
  • MIB may conveyed in the PBCH physical channel. Based on the determined value, the UE may be able to determine if it is able to decode SIB1 for the detected cell and, thus, if it is able to camp on that cell.
  • aspects of the present disclosure may help avoid this scenario, however, by allowing a UE to detect and skip NSA cells during cell selection. As a result, (in subsequent cell selection searches) , the UE may be able to quickly and efficiently detect and camp on a SA cells.
  • FIG. 9 illustrates example operations 900 for wireless communications by a UE, in accordance with aspects of the present disclosure.
  • operations 900 may be performed, by a UE 120 of FIGs. 1 or 4 to detect and recover from a data stall when operating in a dual connectivity (e.g., EN-DC) mode.
  • dual connectivity e.g., EN-DC
  • Operations 900 begin, at 902, by identifying, during an initial cell search procedure, a first cell of a first type that the UE is not able to camp on.
  • the UE adds the identified cell to a list of cells to avoid during the initial cell search procedure. For example, the UE may add an identified NSA cell to a blacklist of cells that are ignored during a cell search procedure.
  • the UE retries the initial cell search procedure, skipping cells on the list.
  • the UE camps on a second cell of a second type identified during the retried initial cell search.
  • Operations 900 of FIG. 9 may be understood with reference to the flow diagram of FIG. 10 that illustrates how a UE may take action to avoid spending time detecting/decoding SSBs from an NSA cell that it is, ultimately, not able to camp on anyway.
  • a local database e.g., some kind of blacklist
  • the UE may retry the search procedure (e.g., immediately) , this time skipping cells (e.g., NSA cells) on the blacklist. This time, by skipping the NSA cells, the UE may be able to detect, and camp on an SA cell.
  • skipping cells e.g., NSA cells
  • the blacklisted (e.g., NSA) cell may be kept on the blacklist for a duration of a timer, T_blacklist.
  • the timer may be configurable to any suitable time (e.g., 300sec) .
  • all cells in the blacklist will not be searched or measured for the duration of the timer T_blacklist.
  • the UE may not waste time on NSA cells but can maximize its processing time and power on searching for a suitable SA cell to camp on.
  • the optimized cell selection procedure (e.g., with NSA cell skipping) proposed herein may also be understood with reference to the call flow diagram of FIG. 11.
  • the UE begins by performing an initial cell search, including both NSA and SA cells.
  • the UE detects the NSA Cell and, adds this cell to the black list (and starts the black list timer) .
  • the UE then re-tries the cell search. This time the UE skips the NSA cell (because it is on the black list) and, therefore, is able to detect the SA Cell. The UE camps on the SA Cell. As shown, once the black list timer expires, the UE may remove the NSA cell from the black list.
  • Potential advantages of the techniques presented herein include the possibility of detecting an NSA cell during an initial cell search procedure and adding that NSA cell to a list of cells to skip during a subsequent cell search. As a result, the next time the UE performs a cell search, it may be able to detect and camp on an SA cell in a relatively short time, improving overall user experience.
  • the methods disclosed herein comprise one or more steps or actions for achieving the described method.
  • the method steps and/or actions may be interchanged with one another without departing from the scope of the claims.
  • the order and/or use of specific steps and/or actions may be modified without departing from the scope of the claims.
  • a phrase referring to “at least one of” a list of items refers to any combination of those items, including single members.
  • “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c) .
  • determining encompasses a wide variety of actions. For example, “determining” may include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, a database or another data structure) , ascertaining and the like. Also, “determining” may include receiving (e.g., receiving information) , accessing (e.g., accessing data in a memory) and the like. Also, “determining” may include resolving, selecting, choosing, establishing and the like.
  • the various operations of methods described above may be performed by any suitable means capable of performing the corresponding functions.
  • the means may include various hardware and/or software component (s) and/or module (s) , including, but not limited to a circuit, an application specific integrated circuit (ASIC) , or processor.
  • ASIC application specific integrated circuit
  • processors 456, 464, 466, and/or controller/processor 480 of the UE 120 and/or processors 420, 430, 438, and/or controller/processor 440 of the BS 110 shown in FIG. 4 may be configured to perform operations 900 of FIG. 9.
  • Means for receiving may include a receiver (such as one or more antennas and/or one or more receive processors) illustrated in FIG. 4.
  • Means for transmitting may include a transmitter (such as one or more antennas and/or one or more transmit processors) illustrated in FIG. 4.
  • Means for monitoring, means for detecting, means for performing one or more actions, means for signaling, means for keeping count, means for providing and means for measuring may include a processing system, which may include one or more processors, such as processors 266, 258, 264, and/or controller/processor 280 of the UE 120 and/or processors 220, 230, 238, and/or controller/processor 240 of the BS 110 shown in FIG. 2.
  • the apparatus or wireless node may have an interface to output the frame for transmission (ameans for outputting) .
  • a processor may output a frame, via a bus interface, to a radio frequency (RF) front end for transmission.
  • the apparatus or wireless node may have an interface to obtain the frame received from another device (a means for obtaining) .
  • a processor may obtain (or receive) a frame, via a bus interface, from an RF front end for reception.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • PLD programmable logic device
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • an example hardware configuration may comprise a processing system in a wireless node.
  • the processing system may be implemented with a bus architecture.
  • the bus may include any number of interconnecting buses and bridges depending on the specific application of the processing system and the overall design constraints.
  • the bus may link together various circuits including a processor, machine-readable media, and a bus interface.
  • the bus interface may be used to connect a network adapter, among other things, to the processing system via the bus.
  • the network adapter may be used to implement the signal processing functions of the PHY layer.
  • a user interface e.g., keypad, display, mouse, joystick, etc.
  • a user interface e.g., keypad, display, mouse, joystick, etc.
  • the bus may also link various other circuits such as timing sources, peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further.
  • the processor may be implemented with one or more general-purpose and/or special-purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuitry that can execute software. Those skilled in the art will recognize how best to implement the described functionality for the processing system depending on the particular application and the overall design constraints imposed on the overall system.
  • the functions may be stored or transmitted over as one or more instructions or code on a computer readable medium.
  • Software shall be construed broadly to mean instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • Computer-readable media include both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • the processor may be responsible for managing the bus and general processing, including the execution of software modules stored on the machine-readable storage media.
  • a computer-readable storage medium may be coupled to a processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor.
  • the machine-readable media may include a transmission line, a carrier wave modulated by data, and/or a computer readable storage medium with instructions stored thereon separate from the wireless node, all of which may be accessed by the processor through the bus interface.
  • the machine-readable media, or any portion thereof may be integrated into the processor, such as the case may be with cache and/or general register files.
  • machine-readable storage media may include, by way of example, RAM (Random Access Memory) , flash memory, ROM (Read Only Memory) , PROM (Programmable Read-Only Memory) , EPROM (Erasable Programmable Read-Only Memory) , EEPROM (Electrically Erasable Programmable Read-Only Memory) , registers, magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof.
  • RAM Random Access Memory
  • ROM Read Only Memory
  • PROM Programmable Read-Only Memory
  • EPROM Erasable Programmable Read-Only Memory
  • EEPROM Electrical Erasable Programmable Read-Only Memory
  • registers magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof.
  • the machine-readable media may be embodied in a computer-program product.
  • a software module may comprise a single instruction, or many instructions, and may be distributed over several different code segments, among different programs, and across multiple storage media.
  • the computer-readable media may comprise a number of software modules.
  • the software modules include instructions that, when executed by an apparatus such as a processor, cause the processing system to perform various functions.
  • the software modules may include a transmission module and a receiving module. Each software module may reside in a single storage device or be distributed across multiple storage devices.
  • a software module may be loaded into RAM from a hard drive when a triggering event occurs.
  • the processor may load some of the instructions into cache to increase access speed.
  • One or more cache lines may then be loaded into a general register file for execution by the processor.
  • any connection is properly termed a computer-readable medium.
  • the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared (IR) , radio, and microwave
  • the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium.
  • Disk and disc include compact disc (CD) , laser disc, optical disc, digital versatile disc (DVD) , floppy disk, and disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers.
  • computer-readable media may comprise non-transitory computer-readable media (e.g., tangible media) .
  • computer-readable media may comprise transitory computer-readable media (e.g., a signal) . Combinations of the above should also be included within the scope of computer-readable media.
  • certain aspects may comprise a computer program product for performing the operations presented herein.
  • a computer program product may comprise a computer-readable medium having instructions stored (and/or encoded) thereon, the instructions being executable by one or more processors to perform the operations described herein.
  • instructions for perform the operations described herein and the appended figures may comprise a computer-readable medium having instructions stored (and/or encoded) thereon, the instructions being executable by one or more processors to perform the operations described herein.
  • modules and/or other appropriate means for performing the methods and techniques described herein can be downloaded and/or otherwise obtained by a user terminal and/or base station as applicable.
  • a user terminal and/or base station can be coupled to a server to facilitate the transfer of means for performing the methods described herein.
  • various methods described herein can be provided via storage means (e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or floppy disk, etc. ) , such that a user terminal and/or base station can obtain the various methods upon coupling or providing the storage means to the device.
  • storage means e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or floppy disk, etc.
  • CD compact disc
  • floppy disk etc.
  • any other suitable technique for providing the methods and techniques described herein to a device can be utilized.

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Abstract

La présente divulgation concerne, selon certains aspects, des communications sans fil et, plus particulièrement, des mécanismes de détection et de saut de cellules sur lesquelles un équipement utilisateur (UE) ne peut pas camper (par exemple, des cellules NSA) au cours d'une procédure de sélection de cellule. En conséquence du saut, un UE peut être apte à détecter et à sélectionner plus rapidement une cellule (par exemple, une cellule SA) sur laquelle l'UE peut camper, ce qui conduit à une meilleure expérience de l'utilisateur.
PCT/CN2020/090511 2020-05-15 2020-05-15 Saut de cellules non autonomes pour sélection de cellule autonome WO2021227007A1 (fr)

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CN103686784A (zh) * 2012-09-20 2014-03-26 苏州简约纳电子有限公司 一种LTE中用户终端在idle态下的小区管理方法及设备
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US20190069205A1 (en) * 2017-08-28 2019-02-28 Qualcomm Incorporated Techniques for mode selection and cell selection/reselection
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