WO2021182842A1 - Procédé et système de connexion à une cellule lte - Google Patents

Procédé et système de connexion à une cellule lte Download PDF

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Publication number
WO2021182842A1
WO2021182842A1 PCT/KR2021/002894 KR2021002894W WO2021182842A1 WO 2021182842 A1 WO2021182842 A1 WO 2021182842A1 KR 2021002894 W KR2021002894 W KR 2021002894W WO 2021182842 A1 WO2021182842 A1 WO 2021182842A1
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WIPO (PCT)
Prior art keywords
lte
dss
cell
configuration
stack
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PCT/KR2021/002894
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English (en)
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Raja Moses Manoj Kumar Eda
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Samsung Electronics Co., Ltd.
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Publication of WO2021182842A1 publication Critical patent/WO2021182842A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements

Definitions

  • the present disclosure in general, relates to connecting to network cells, and, in particular, relates to system and methods for connecting to an LTE cell.
  • the 5G or pre-5G communication system is also called a 'beyond 4G network' or a 'post LTE system'.
  • the 5G communication system is considered to be implemented in higher frequency (mmWave) bands, e.g., 60GHz bands, so as to accomplish higher data rates.
  • mmWave e.g., 60GHz bands
  • MIMO massive multiple-input multiple-output
  • FD-MIMO full dimensional MIMO
  • array antenna an analog beam forming, large scale antenna techniques are discussed in 5G communication systems.
  • RANs cloud radio access networks
  • D2D device-to-device
  • wireless backhaul moving network
  • CoMP coordinated multi-points
  • FQAM FSK and QAM modulation
  • SWSC sliding window superposition coding
  • ACM advanced coding modulation
  • FBMC filter bank multi carrier
  • NOMA non-orthogonal multiple access
  • SCMA sparse code multiple access
  • a UE operating in 5G standalone mode will have to rely on 4G for voice services for some more time.
  • VoIP Voice over NR
  • the UE may resort to relying on Voice over LTE (VoLTE).
  • VoIP Voice over LTE
  • a UE in idle mode need to acquire neighboring 4G cell information for connecting to the LTE network.
  • a UE may be required to establish a 4G connection and/or shift to 4G for availing network services.
  • a method performed by a User Equipment (UE) for connecting to a Long-Term Evolution (LTE) cell comprises detecting occurrence of a network event to establish or resume a connection to LTE.
  • the method further comprises obtaining cell information corresponding to an LTE cell from a Dynamic Spectrum Sharing (DSS) configuration available to the UE, in response to the occurrence of the network event.
  • DSS Dynamic Spectrum Sharing
  • the method further comprises performing an LTE measurement using the obtained cell information for connecting to the LTE cell.
  • a User Equipment configured to connect to a Long-Term Evolution (LTE) cell
  • the UE comprises a controller configured to detect occurrence of a network event and an LTE stack coupled to the controller.
  • the LTE stack is configured to obtain cell information corresponding to an LTE cell from a Dynamic Spectrum Sharing (DSS) configuration available to the UE, in response to the occurrence of the network event.
  • DSS Dynamic Spectrum Sharing
  • the LTE stack is further configured to perform an LTE measurement using the obtained cell information for connecting to the LTE cell.
  • Fig. 1 illustrates a scanning mechanism of a UE for scanning a frequency band
  • Fig. 2 illustrates a wireless communication system, according to one or more embodiments of the present subject matter
  • Fig. 3 illustrates a flowchart of a method performed by a User Equipment (UE) for connecting to a Long-Term Evolution (LTE) cell, according to an embodiment of the present subject matter
  • UE User Equipment
  • LTE Long-Term Evolution
  • Fig. 4 illustrates a flow diagram depicting transfer of DSS information from the NR stack to an LTE stack of a UE, according to an embodiment of the present subject matter
  • Fig. 5 illustrates a flowchart of a method depicting a use case, according to an embodiment of the present subject matter
  • FIG. 6 illustrates a flowchart of a method depicting a use case, according to an embodiment of the present subject matter
  • Fig. 7 illustrates a use case depicting a radio link failure scenario, according to an embodiment of the present subject matter
  • Fig. 8 illustrates a use case depicting a UE idle to UE connected mode scenario, according to an embodiment of the present subject matter
  • Fig. 9 illustrates a use case depicting a carrier aggregation scenario with DSS, according to an embodiment of the present subject matter.
  • Fig. 10 illustrates a schematic block diagram of a User Equipment, according to an embodiment of the present subject matter.
  • New Radio (NR) or Fifth Generation (5G) technology is the next generation mobile wireless communication, which is designed to support diverse use cases by three generic services: Enhanced Mobile Broadband (eMBB), Ultra Reliable Low Latency Communication (URLLC) services, and high density like in Massive machine-type communications (mMTC).
  • eMBB Enhanced Mobile Broadband
  • URLLC Ultra Reliable Low Latency Communication
  • mMTC Massive machine-type communications
  • DC Dual Connectivity
  • SA standalone
  • SA standalone
  • the spectrum can be dynamically shared between 4G LTE and 5G NR to support smooth transition from NSA to SA mode. Describer below are the available deployment modes in 5G in various phases.
  • the SA mode is the final phase in 5G deployment, where 5G NR operates independently. This refers to using 5G cells for both control signalling and user data transfer. It includes the new 5G Packet Core architecture instead of relying on the 4G Evolved Packet Core (EPC). It is expected to have lower cost, better efficiency, and to assist development of new use cases.
  • EPC Evolved Packet Core
  • E-UTRAN New Radio - Dual Connectivity (EN-DC) architecture allows UE to access both LTE and 5G simultaneously in NSA mode. It allows user equipment (UE) to connect to an LTE enodeB (eNB) that acts as a master node (MN) and a 5G gnodeB (gNB) that acts as a secondary node (SN). The SN is added by the MN.
  • LTE enodeB eNB
  • MN master node
  • gNB 5G gnodeB
  • SN secondary node
  • the group of LTE cells configured and activated by carrier aggregation (CA) form a Master Cell Group (MCG) and NR cells form a Secondary Cell Group (SCG).
  • CA carrier aggregation
  • MCG Master Cell Group
  • SCG Secondary Cell Group
  • the control plane functionality of 5G is provided by 4G, while 5G NR is exclusively focused on the user plane.
  • DSS Dynamic Spectrum Sharing
  • the DSS requires synchronization of 4G and 5G systems in both time and frequency domain.
  • eNB always transmits Cell Specific Reference Signal (CRS).
  • CRS Cell Specific Reference Signal
  • UE Whenever 5G network configured with DSS schedules downlink data around these CRS resources, UE must perform Rate Matching to successfully decode the downlink data.
  • 5G network provides UE with LTE CRS configuration via 5G Radio Resource Control (RRC) message using "RateMatchPatternLTE-CRS" parameter as shown in Table 1 below.
  • RRC Radio Resource Control
  • the aforementioned parameter configures reserved resources based upon the pattern generated by the LTE CRS.
  • the term 'Rate Matching' is used because reserved resources puncture the normal PDSCH resources.
  • Physical Layer will adjust the number of bits after channel coding to account for the reduced number of resources elements available for Physical Downlink Shared Channel (PDSCH).
  • PDSCH Physical Downlink Shared Channel
  • This field helps UE in determining centre of the LTE carrier where the Primary Synchronization Signal and the Secondary Synchronization signal ( PSS/SSS) are located.
  • -Mbsfn-SubframeConfigList This field allows specification of LTE subframes configured for Multimedia Broadcast Multicast Services. Within these subframes, the CRS is restricted to one or two symbols only.
  • -nrofCRS-Ports Specifies the number of LTE CRS antenna port to perform the rate-match.
  • a UE when a UE is without knowledge of neighbouring LTE cell frequencies or valid prior stored cell information and needs to camp onto an LTE eNB, it first chooses a band to scan. Thereafter, the UE starts scanning from the lower edge frequency of the band and increases in steps of channel raster (100 kHz) until it finds Primary synchronization signal (PSS)/Secondary synchronization signal (SSS) signal, as shown in Figure 1. These signal are located in the centre of the channel bandwidth and identifies the Physical Cell Identity (PCI). The frequency position of the CRS is calculated based on the PCI. Subsequently, the UE measures the signal strength of CRS and decides whether or not to camp on this channel.
  • PSS Primary synchronization signal
  • SSS Secondary synchronization signal
  • the UE may leverage the details required for scanning an LTE band/channel from the DSS configuration received via 5G RRC message using "RateMatchPatternLTE-CRS" parameter, as these are readily and directly available to UE.
  • Fig. 2 illustrates a wireless communication system according to an embodiment of the present subject matter. More particularly, Fig. 2 illustrates a base station 210, a terminal 220, and a terminal 230 as some of nodes that use a wireless channel in a wireless communication system. Although a single base station is illustrated in Fig. 2, another base station that is the same as, or different from, the base station 210 may be further included.
  • Embodiments of the wireless communication system may include one or more terminals, such as the terminals 220 and 230, and one or more radio network nodes, such as the base station 210, capable of communicating with the terminals 220 and 230.
  • the wireless communication system may also include any additional elements suitable to support communication between terminals 220 and 230 or between a terminal, such as the terminal 220, and another communication device (such as a landline telephone).
  • the base station 210 may be a network infrastructure that provides radio access to the terminals 220 and 230.
  • the base station 210 may have coverage defined by a predetermined geographic area based on a distance to which the base station 210 is capable of transmitting a signal.
  • the base station 210 may be referred to as "access point (AP),” “eNodeB (eNB),” “gNodeB (gNB),” “5th generation node (5G node),” “wireless point,” “transmission/reception point (TRP),” or other terms having equivalent technical meaning, in addition to “base station.”
  • each of the terminal 220 and the terminal 230 is a device used by a user, and may perform communication with the base station 210 via a wireless channel.
  • at least one of the terminals 220 and 230 may operate irrespective of handling by a user. That is, at least one of the terminals 220 and the terminal 230 may be a device that performs machine type communication (MTC), and may not be carried by a user.
  • MTC machine type communication
  • Each of the terminal 220 and the terminal 230 may be referred to as "user equipment (UE)," “mobile station,” “subscriber station,” “remote terminal,” “wireless terminal,” “user device,” or other terms having the equivalent technical meaning, in addition to "terminal.”
  • a terminal may include any suitable combination of hardware and/or software.
  • a terminal such as terminal 220, may include the components described with respect to Fig 10 below.
  • the base station 210, the terminal 220, and the terminal 230 may transmit and receive wireless signals in a millimeter wave (mmWave) band (e.g., 28GHz, 30GHz, 38GHz, or 60GHz).
  • mmWave millimeter wave
  • the base station 210, the terminal 220, and the terminal 230 may perform beamforming.
  • the beamforming may include transmission beamforming and reception beamforming. That is, the base station 210, the terminal 220, and the terminal 230 may assign directivity to a transmission signal or a reception signal.
  • the base station 210 and the terminals 220 and 230 may select serving beams via a beam search or beam management procedure. After the serving beams are selected, communication may be performed via resources that are in the quasi co-located (QCL) relationship with resources used for transmitting the serving beams.
  • QCL quasi co-located
  • the base station 210, the terminal 220, and the terminal 230 may transmit and receive wireless signals in a band other than the millimeter wave band.
  • the band at which the base station 210, the terminal 220, and the terminal 230 transmit and receive wireless signals is not limited to the millimeter wave band.
  • the base station 210, the terminal 220, and the terminal 230 may perform mutual communication without performing beamforming.
  • the base station 210, the terminal 220, and the terminal 230 may use any suitable radio access technology, such as long term evolution (LTE), LTE-Advanced, UMTS, HSPA, GSM, cdma2000, NR, WiMax, WiFi, and/or other suitable radio access technology.
  • LTE long term evolution
  • UMTS Long Term Evolution
  • HSPA High Speed Packet Access
  • GSM Global System for Mobile communications
  • cdma2000 High Speed Downlink Packet Access
  • NR Fifth Generation
  • WiMax Wireless Fidelity
  • WiFi Wireless Fidelity
  • the wireless communication system may include any suitable combination of one or more radio access technologies.
  • various embodiments may be described within the context of certain radio access technologies. However, the scope of the disclosure is not limited to the examples and other embodiments could use different radio access technologies.
  • Fig. 3 illustrates a flowchart of a method 300 performed by a User Equipment (UE) for connecting to a Long-Term Evolution (LTE) cell, according to an embodiment of the present subject matter.
  • UE User Equipment
  • LTE Long-Term Evolution
  • the method 300 includes detecting occurrence of a network event.
  • the network event may be a network event that causes the UE to establish a connection/reconnection with an LTE cell.
  • the network event may be any of the various LTE measurement events, as defined in the specification.
  • the network event may be switching of the UE from an idle mode to a connected mode.
  • the UE may be operating in an EN-DC mode.
  • the network event may be a non-support of a network service in NR SA mode.
  • the network service may be a service that a user seeks to avail over the network. For example, a VoNR call.
  • the method 300 includes obtaining cell information corresponding to an LTE cell from a Dynamic Spectrum Sharing (DSS) configuration available to the UE.
  • the cell information corresponding to the LTE cell includes frequency location information associated with at least one of: a primary synchronization signal, a secondary synchronization signal, and a cell specific reference signal along with its ports.
  • the ports identify the number of resource elements and its location occupied by the CRS signals in resource grid.
  • the cell information included in the DSS configuration available to the UE may be obtained.
  • the DSS may be obtained from an internal storage space where the DSS configuration is stored after the DSS configuration is received from the network.
  • the DSS configuration may be received from the network, when the 5G network is configured in the UE for operating along with the LTE connection.
  • the method 300 may further include receiving the DSS configuration at an NR stack of the UE. Subsequently, a DSS-unique ID may be assigned to the DSS configuration. Thereafter, the the DSS configuration and the assigned unique ID may be provided to an NR-LTE interface. Furthermore, the NR-LTE interface may provide the DSS configuration to the LTE stack of the UE.
  • the LTE stack may store the DSS configuration in the storage space and may obtain the same from the storage space in response to detection of the network event.
  • the method 300 includes performing an LTE measurement using the obtained cell information for connecting to the LTE cell.
  • the UE may connect to the LTE cell. That is, the UE may utilize the cell information to calculate the frequency position of the CRS and may accordingly measure the strength of the CRS. Based on the determined strength, the UE may then decide to camp on the LTE cell.
  • a plurality of DSS configurations associated with a plurality of New Radio (NR) cells are available to the UE.
  • each of the plurality of DSS configurations includes cell information corresponding to an LTE cell.
  • a ranking based approach may be implemented in the method 300 for selecting a particular DSS configuration as described below.
  • the method 300 includes identifying, for each of the plurality of NR cells, an LTE cell bandwidth from corresponding DSS configuration. Continuing further, the method 300 includes identifying an amount of grant allocated to each of the plurality of NR cells. The method 300 further includes calculating a grant per unit bandwidth for each of the plurality of NR cells based on identified LTE cell bandwidth and the amount of grant allocated to the corresponding NR cell. Accordingly, the plurality of NR cells may be ranked based on the calculated grant per unit bandwidth.
  • the method 300 may include identifying an NR cell from the plurality of NR cells that has the highest rank. Subsequently, the method 300 may include obtaining the cell information corresponding to the LTE cell from the DSS configuration of the identified NR cell.
  • the LTE stack may store the DSS configuration.
  • the method 300 may include detecting removal of DSS configuration.
  • the removal of the DSS configuration may be performed in response to occurrence of UE or a network event For example, in case the UE moves to a NR SA network, the DSS configuration may be removed.
  • a handover to another NR cell having another DSS configuration may be detected. Accordingly, the previously stored DSS configuration may be removed.
  • a handover to another NR cell with no DSS support may be detected. Accordingly, the DSS configuration may be removed.
  • the changes in the DSS configuration can be deducted by the UE from the RRC Reconfiguration message from the network in the event of HO or change in the NR cell configuration or UE moving to different cell. Accordingly, events that require removal of DSS configuration or reception of new DSS configuration from network may occur and may be detected. Accordingly, the DSS configuration may be removed.
  • the method 300 further includes providing a remove DSS message from the NR stack to the NR-LTE interface.
  • the remove DSS message may include a DSS-unique ID.
  • this DSS-unique ID is of a DSS configuration that is stored in the LTE stack.
  • the NR-LTE interface may identify the DSS configuration which is corresponding to the DSS-unique ID. Thereafter, the NR-LTE interface may be configured to indicate to the LTE stack to remove the identified DSS configuration. On receiving said indication, the LTE stack removes the DSS configuration stored in the storage space.
  • the method 300 may further include receiving another DSS configuration at the NR stack and storage of the another DSS configuration in the storage space, in a manner similar to as explained above in step 304.
  • the network when seeking to reconnect to the network when the UE is in the idle mode, may provide cell information corresponding to a plurality of LTE cell, for example, say in SIB 5 message.
  • the method 300 may include obtaining a plurality of cell information for connecting to one of the plurality of neighbouring LTE cells.
  • the method further comprises identifying cell information corresponding to the DSS configuration in the plurality of cell information.
  • the method 300 may include prioritizing the identified cell information for LTE measurement for connecting to an LTE cell corresponding to the identified cell information.
  • Utilizing the already available LTE cell information from DSS configuration for connecting to the LTE cell facilitates in reducing the time which is otherwise required for establishing a connection with an LTE cell in the case of occurrence of the network event. For instance, steps such as RACH process whereby SIB5 is acquired may be averted. Thus, a time advantage at least equal to the time period associated with SIB 5 acquisition is achieved.
  • an operation efficiency in terms of time taken with regards to reselecting to LTE from 5G of about 46% is witnessed. In extreme scenario an efficiency of approx. 90% may be achieved.
  • Fig. 4 illustrates a flow diagram 400 depicting transfer of DSS information from the NR stack to an LTE stack of a UE, according to an example embodiment of the present subject matter.
  • a UE when a UE is configured with 5G cell along with DSS configuration, it maps the LTE cell details within the DSS configuration with a unique identifier and sends it to the 4G stack via the LTE-NR interface as shown in Figure 4.
  • 4G stack saves this configuration until explicit indication is received from 5G to remove this configuration.
  • UE prioritizes the LTE frequency received from the DSS configuration.
  • the NR RRC receives the DRS configuration from the network.
  • the NR RRC passes the DSS configuration with a mapping to a unique ID to the NR-LTE interface.
  • the LTE-NR interface module may be configured to save the configuration and pass on the DSS configuration to the LTE stack.
  • the LTE RRC module informs the LTE measurement interface module about the cell information of the LTE cell from the DSS configuration.
  • the LTE measurement interface module is configured to configure the transceiver to carrier frequency or bandwidth of the LTE as learnt from the cell information of the LTE included in the DSS configuration.
  • Fig. 5 illustrates a flowchart of a method 500 depicting a use case, according to an example embodiment of the present subject matter.
  • the method 500 includes detecting non-availability of VoNR service in a UE that is operating in NR SA mode.
  • the method 500 includes validating if DSS is configured by the network.
  • the UE may validate the configuration of the DSS based on the NR configuration messages received from the network. More particularly, in an example, the UE may check if the "RateMatchPatternLTE-CRS" parameter and its associated Information Elements (IE's) specified in Table 1 above are present in the NR RRC Configuration message received by UE from network. On determining that the aforementioned elements are present, the UE may determine that the DSS is configured by the network.
  • IE's Information Elements
  • the method 500 may proceed to step 506.
  • the method 500 includes saving the DSS configuration and using the DSS configuration to reselect to LTE, when initiation of a voice call is determined.
  • the method terminates at step 508.
  • Fig 6 illustrates a flowchart of a method 600 depicting a use case, according to an example embodiment of the present subject matter.
  • carrier aggregation is configured in NR with DSS configuration.
  • the grant allocation per unit bandwidth (GPUBW) of LTE is calculated for every 2 seconds.
  • the NR cells are ranked at step 606.
  • the GPUBW and the rank are inversely proportional, i.e., higher the GPUBW lower the rank of the NR cell.
  • RLF Radio Link Failure
  • Fig. 7 illustrates a use case 700 depicting a radio link failure scenario, according to an embodiment of the present subject matter.
  • a UE 702 may be operating in EN-DC mode on LTE band B66 and NR band N5.
  • the NR band is sharing the same spectrum with LTE band B5 and the UE 702 may be connected to the eNodeB and the gNB, as shown.
  • the signalling conditions of B66 may go worse and the UE 702 may encounter an RLF.
  • the signalling conditions on NR band N5 are good as the UE 702 is close to gNB.
  • the UE 702 may attempt to resume the radio connection on LTE B66 but this will fail as UE is close to cell edge.
  • resuming radio connection on LTE B5 using the DSS configuration will help restore the connection quickly with less interruption on the data services.
  • Fig. 8 illustrates a use case 800 depicting a UE idle to UE connected mode scenario, according to an embodiment of the present subject matter.
  • the UE 802 is connected to eNodeB and operating on LTE band B13.
  • the UE 802 may be operating in EN-DC mode on LTE band B66 and NR band N5.
  • the NR band is sharing the same spectrum with LTE band B5 and the UE 702 may be connected to the eNodeB and the gNB, as shown.
  • the UE may be moving away from LTE B66 cell, and is IDLE mode, i.e., no active RRC connection. Now, when the UE 802 wants to go to connected mode, it needs to search a cell. In accordance with the aspects of the present subject matter as described above, the UE 802 may immediately scan an acquire LTE B5 cell, thereby saving on time and enhancing user service experience.
  • Fig. 9 illustrates a use case 900 depicting a carrier aggregation scenario with DSS, according to an embodiment of the present subject matter.
  • a UE 902 may be configured with multiple 5G cells with DSS configuration using CA as shown in the figure.
  • the UE 902 may estimate the congestion levels on each of these 5G cells based on the grants allocated per unit bandwidth (GPUBW). Accordingly, the UE 802 may rank all these cells according to the GPUBW. Higher values of GPUBW denotes the cell is less congested and is given lower values as rank.
  • GPUBW grants allocated per unit bandwidth
  • the GPUBW is calculated periodically for every 2 seconds and the rank is updated accordingly. Now, this information is transferred to the LTE stack and the LTE stack may use this information when LTE perform cell measurement (e.g. during RLF event) and priority is given to the cells which have lower value of rank to resume the connection.
  • Fig. 10 is a diagram 1000 illustrating the configuration of the terminal 220 in a wireless communication system according to an embodiment.
  • the configuration of Fig. 10 may be understood as a part of the configuration of the terminal 220.
  • terms including “unit” or “er” at the end may refer to the unit for processing at least one function or operation and may be implemented in hardware, software, or a combination of hardware and software.
  • the terminal 220 may include a communication unit 1010 (e.g., communicator or communication interface), a storage unit 1020 (e.g., storage), and a controller 1030 (e.g., at least one processor).
  • the terminal 120 may be a User Equipment, such as a cellular phone or other device that communicates over a cellular network (such as a 5G or pre-5G network or any future wireless communication network).
  • the communication unit 1010 may perform functions for transmitting and receiving signals via a wireless channel. For example, the communication unit 1010 performs a function of conversion between a baseband signal and a bit stream according to the physical layer standard of a system. By way of further example, when data is transmitted, the communication unit 1010 generates complex symbols by encoding and modulating a transmission bit stream. Similarly, when data is received, the communication unit 1010 restores a reception bit stream by demodulating and decoding a baseband signal. Furthermore, the communication unit 1010 up-converts a baseband signal into an RF band signal and transmits the same via an antenna, and down-converts an RF band signal received via an antenna into a baseband signal. For example, the communication unit 1010 may include at least one of a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like.
  • the communication unit 1010 may include or utilize a plurality of transmission and reception paths.
  • the communication unit 1010 may include at least one antenna array including a plurality of antenna elements.
  • the communication unit 1010 may include a digital circuit and an analog circuit (e.g., a radio frequency integrated circuit (RFIC)).
  • RFIC radio frequency integrated circuit
  • the digital circuit and the analog circuit may be implemented as one package.
  • the communication unit 1010 may include a plurality of RF chains.
  • the communication unit 1010 may perform beamforming.
  • the communication unit 1010 may transmit and receive a signal as described above. Accordingly, the entirety or a part of the communication unit 1030 may be referred to as “transmitting unit,” “receiving unit,” “transceiving unit,” “transmitter,” “receiver,” or “transceiver.” Also, the transmission and reception performed via a wireless channel, which is described hereinbelow, may include the above-described processing performed by the communication unit 1010.
  • the storage unit 1020 may store data, such as a basic program, an application program, configuration information, and the like for operating the terminal 220.
  • the storage unit 1020 may be configured as a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory.
  • the storage unit 1020 may provide data stored therein in response to a request from the controller 1030.
  • the controller 1030 may control overall operations of the terminal 220. For example, the controller 1030 may transmit and receive a signal via the communication unit 1010. Further, the controller 1030 records data in the storage unit 1020 and reads the recorded data. The controller 1030 may perform the functions of a protocol stack required by a particular communication standard. To this end, the controller 1030 may include at least one processor or micro-processor, or may be a part of the processor. Also, a part of the communication unit 1010 and the controller 1030 may be referred to as a communication processor (CP). Furthermore, to this end, the controller 1030 may be coupled an NR stack 1040, an NR-LTE interface 1050, and an LTE stack 1060 present in the terminal 220.
  • CP communication processor
  • the controller 1030 may be configured to detect occurrence of a network event.
  • the network event may include one of: an LTE measurement event, a switching of UE from idle mode to connected mode, and non-support of network service in NR SA mode.
  • the LTE stack 1060 may be configured to obtain cell information corresponding to an LTE cell from a Dynamic Spectrum Sharing (DSS) configuration available to the UE, in response to the occurrence of the network event.
  • the cell information corresponding to the LTE cell includes frequency location information associated with at least one of: a primary synchronization signal, a secondary synchronization signal, and a cell specific reference signal along with its ports.
  • the LTE stack 1060 may be further configured to perform an LTE measurement using the obtained cell information for connecting to the LTE cell.
  • a plurality of DSS configurations associated with a plurality of New Radio (NR) cells may be available to the terminal 220.
  • each of the plurality of DSS configurations includes cell information corresponding to an LTE cell.
  • the controller 1030 may be further configured to identify, for each of the plurality of NR cells, an LTE cell bandwidth from corresponding DSS configuration and identify an amount of grant allocated to each of the plurality of NR cells.
  • the controller 1030 further calculates a grant per unit bandwidth for each of the plurality of NR cells based on the identified LTE cell bandwidth and the amount of grant allocated to the NR cell. Accordingly, the controller 1030 may determine a rank for each the plurality of NR cells based on calculated grant per unit bandwidth.
  • the controller 1030 may be further configured to identify an NR cell having the highest rank from amongst the plurality of NR cells. Accordingly, the controller 1030 may be configured to obtain the cell information corresponding to the LTE cell from the DSS configuration of the identified NR cell.
  • the NR stack 1040 may be configured to receive the DSS configuration and assign a DSS-unique ID to the DSS configuration. Thereafter, the NR stack 1040 may be configured to provide the DSS configuration and the assigned unique ID to the NR-LTE interface 1050.
  • the NR-LTE interface 1050 may be configured to provide the DSS configuration to the LTE stack 1060 of the terminal 220.
  • the LTE stack 1060 may be configured to store the DSS configuration in the storage unit 1020.
  • the NR stack 1040 may be further configured to detect one of: a removal of the DSS configuration, a handover to another NR cell having another DSS configuration, and a handover to another NR cell with no DSS support. Accordingly, the NR stack 1040 may be configured to provide a remove DSS message including a DSS-unique ID to the NR-LTE interface. Furthermore, the NR-LTE interface 1050 may be configured to identify the DSS configuration corresponding to the DSS-unique ID and indicate to the LTE stack 1060 to remove the identified DSS configuration. In an example, the LTE stack 1060 may be configured to remove the DSS configuration from the storage unit 1020.
  • the NR stack 1040 may be further configured to receive another DSS configuration at the NR stack of the UE. Furthermore, the NR stack 1040 may be further configured to assign a DSS-unique ID to another DSS configuration. Furthermore, the NR stack 1040 may be further configured to provide another DSS configuration and the assigned unique ID to the NR-LTE interface 1050. Furthermore, the NR-LTE interface 1050 is configured to provide another DSS configuration to the LTE stack 1060 of the terminal 220. In an example, the LTE stack 1060 may be configured to store another DSS configuration in the storage unit 1020.
  • the controller 1030 may be configured to obtain a plurality of cell information for connecting to one of a plurality of neighbouring LTE cells. Furthermore, in an example embodiment, the controller 1030 may be configured to identify cell information corresponding to the DSS configuration in the plurality of cell information. Furthermore, in an example embodiment, the controller 1030 may be configured to prioritize the identified cell information for LTE measurement for connecting to an LTE cell corresponding to the identified cell information.
  • Extensive simulations were performed on a UE that does not support VoNR and with limited mobility (always within the range for NR cell).
  • the UE was set to operate on 5G SA and EN-DC modes with NR cell configured with DSS.
  • Table 2 shows the time taken by UE when it is allowed to perform multiple LTE band scans, with each band consisting of 30 E-UTRA Absolute Radio Frequency Channel Number (EARFCN) and the time is captured to scan all these 30 EARFCNs.
  • E-UTRA Absolute Radio Frequency Channel Number EARFCN
  • Table 3 shows the minimum and maximum time for re-selecting to 4G cell from 5G cell with different configuration values for SI periodicity and number of LTE frequencies in SIB5.
  • the UE is configured to use MSG3 based RACH procedure for acquiring SIB's.
  • RACH procedure to acquire SIB5 is initiated. Since test is performed under good signalling for min and max configurations, RACH procedure takes 12ms for both cases.
  • SIB5 is configured with minimum periodicity set as 80ms (min), then the average waiting time to receive it is 40ms and in extreme scenarios it is 512ms when maximum periodicity is set [2] and the number of LTE frequencies in SIB5 is set as 1(min) and 8(max). With each LTE frequencies taking 60ms to scan it takes 480ms to complete 8 frequencies scan.
  • the LTE frequency to reselect is known before from NR 5G DSS configuration, and therefore steps 1 and 2 are not required.
  • the total time taken for setting voice call is shown in Table 4. We see a significant reduction in latencies by 46% (100 - (60)/112)*100) and up to 94% (100-(60/1004)*100) in extreme scenario.

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

Abstract

Dans un mode de réalisation donné à titre d'exemple, l'invention concerne un procédé mis en oeuvre par un équipement utilisateur (UE) pour se connecter à une cellule d'évolution à long terme (LTE). Le procédé comprend la détection de l'apparition d'un événement de réseau. Le procédé comprend en outre l'obtention d'informations de cellule correspondant à une cellule LTE à partir d'une configuration de partage de spectre dynamique (DSS) disponible pour l'UE, en réponse à l'apparition de l'événement de réseau. Le procédé comprend en outre la mise en oeuvre d'une mesure LTE à l'aide des informations de cellule obtenues pour la connexion à la cellule LTE.
PCT/KR2021/002894 2020-03-11 2021-03-09 Procédé et système de connexion à une cellule lte WO2021182842A1 (fr)

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Citations (3)

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US20150092746A1 (en) * 2013-09-30 2015-04-02 Telefonaktiebolaget L M Ericsson (Publ) Enhancement on radio link failure report to record necessary timing details for a dual-threshold handover trigger event
US20170303148A1 (en) * 2012-11-15 2017-10-19 Mediatek Inc. Radio Link Failure Report Extensions in Mobile Communication Networks
US20190319692A1 (en) * 2018-04-13 2019-10-17 Samsung Electronics Co., Ltd. Method and apparatus for transmitting and receiving signal in wireless communication system

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US20170303148A1 (en) * 2012-11-15 2017-10-19 Mediatek Inc. Radio Link Failure Report Extensions in Mobile Communication Networks
US20150092746A1 (en) * 2013-09-30 2015-04-02 Telefonaktiebolaget L M Ericsson (Publ) Enhancement on radio link failure report to record necessary timing details for a dual-threshold handover trigger event
US20190319692A1 (en) * 2018-04-13 2019-10-17 Samsung Electronics Co., Ltd. Method and apparatus for transmitting and receiving signal in wireless communication system

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