WO2021027939A1 - Mesure d'agrégation de porteuses et de connectivité double en mode repos - Google Patents

Mesure d'agrégation de porteuses et de connectivité double en mode repos Download PDF

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Publication number
WO2021027939A1
WO2021027939A1 PCT/CN2020/109312 CN2020109312W WO2021027939A1 WO 2021027939 A1 WO2021027939 A1 WO 2021027939A1 CN 2020109312 W CN2020109312 W CN 2020109312W WO 2021027939 A1 WO2021027939 A1 WO 2021027939A1
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WIPO (PCT)
Prior art keywords
measurement
carriers
idle mode
perform
carrier
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PCT/CN2020/109312
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English (en)
Inventor
Din-Hwa Huang
Tsang-Wei Yu
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Mediatek Inc.
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Publication date
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Publication of WO2021027939A1 publication Critical patent/WO2021027939A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports

Definitions

  • the present disclosure relates generally to wireless communications, and specifically relates to carrier aggregation and dual connectivity measurement in idle mode.
  • a user equipment can operate between two modes, i.e., connected mode and idle mode.
  • connected mode When the UE sends the data for communication, the UE is said to be in the connected mode, and when the UE does not have any data to send, the UE is said to be in the idle mode.
  • idle mode is also referred to as inactive mode.
  • the UE can perform early measurement on CA/DC when the UE is in the idle mode and then report the measurement to a base station when the UE enters the connected mode from the idle mode.
  • EMR early measurement report
  • CA carrier aggregation
  • DC dual connectivity
  • the UE can perform early measurement on CA/DC when the UE is in the idle mode and then report the measurement to a base station when the UE enters the connected mode from the idle mode.
  • EMR early measurement report
  • CA carrier aggregation
  • DC dual connectivity
  • aspects of the disclosure provide a method of wireless communication at a user equipment (UE) .
  • UE user equipment
  • whether the UE is in an idle mode and able to perform carrier aggregation (CA) and dual connectivity (DC) measurement in the idle mode is determined.
  • CA carrier aggregation
  • DC dual connectivity
  • a first plurality of carriers is monitored for re-selection measurement.
  • a second plurality of carriers is monitored for at least one of the CA/DC measurement and the re-selection measurement.
  • An upper limit of a total number of the first plurality of carriers is equal to an upper limit of a total number of the second plurality of carriers.
  • the CA/DC measurement is performed on a subset of the second plurality of carriers.
  • the CA/DC measurement is reported to a base station (BS) when the UE is in a connected mode.
  • BS base station
  • the UE is determined to be able to perform the CA/DC measurement in the idle mode when the CA/DC measurement is supported by both the UE and the BS.
  • the UE is determined to be not able to perform the CA/DC measurement in the idle mode when the CA/DC measurement is not supported by at least one of the UE and the BS.
  • a cell identification of a neighboring cell is detected with the first plurality of carriers.
  • a signal quality of the neighboring cell is measured with the first plurality of carriers.
  • one of the second plurality of carriers is an overlapping carrier when the carrier is monitored for both the CA/DC measurement and the re-selection measurement.
  • one of the second plurality of carriers is a non-overlapping carrier when the carrier is monitored for the CA/DC measurement and not monitored for the re-selection measurement.
  • the CA/DC measurement is performed on a first subset of the second plurality of carriers when one of signal qualities of a serving cell is less than or equal to a threshold.
  • the CA/DC measurement is performed on a second subset of the second plurality of carriers when all of the signal qualities of the serving cell is greater than the threshold.
  • a total number of the first subset of the second plurality of carriers is less than or equal to a total number of the second subset of the second plurality of carriers.
  • the signal qualities include at least one of reference signal received power (RSRP) and reference signal received quality (RSRQ) .
  • the total number of the second plurality of carriers is one of 8, 10, and 14.
  • the apparatus includes processing circuitry that determines whether the apparatus is in an idle mode and able to perform carrier aggregation (CA) and dual connectivity (DC) measurement in the idle mode.
  • CA carrier aggregation
  • DC dual connectivity
  • the processing circuitry monitors a first plurality of carriers for re-selection measurement.
  • the processing circuitry monitors a second plurality of carriers for at least one of the CA/DC measurement and the re-selection measurement.
  • An upper limit of a total number of the first plurality of carriers is equal to an upper limit of a total number of the second plurality of carriers.
  • the processing circuitry performs the CA/DC measurement on a subset of the second plurality of carriers.
  • the processing circuitry reports the CA/DC measurement to a base station (BS) when the apparatus is in a connected mode.
  • BS base station
  • the disclosure can further provide a non-transitory computer-readable medium which stores instructions implementing any one or a combination of the above methods for wireless communication.
  • FIG. 1 shows exemplary serving areas within which a user equipment (UE) is located according to an embodiment of the disclosure
  • FIG. 2A shows an example in which there is overlapping carrier (s) between a re-selection measurement and a carrier aggregation (CA) and dual connectivity (DC) measurement according to an embodiment of the disclosure;
  • FIG. 2B shows an example in which there is no overlapping carrier (s) between the re-selection measurement and the CA/DC measurement according to an embodiment of the disclosure
  • FIG. 3 shows a flowchart outlining an exemplary process according to embodiments of the disclosure.
  • FIG. 4 shows an exemplary apparatus according to embodiments of the disclosure.
  • a user equipment e.g., a cell phone or tablet
  • the UE can perform measurements for mobility. For example, in order to access available services, the UE can first perform a cell selection measurement to select a suitable serving cell where the UE is allowed to camp on and then perform a re-selection measurement to select a more suitable serving cell where the UE is allowed to camp on.
  • the re-selection measurement may allow the UE to find a serving cell that has the best condition among all serving cells where the UE is allowed to camp on.
  • the UE can perform EMR on CA/DC when the UE is in the idle mode. This is also referred to as idle mode CA/DC measurement.
  • the UE may need to allocate radio resources between the re-selection measurement and the CA/DC measurement.
  • the UE may need more radio resources for the re-selection measurement.
  • the signal quality of the serving cell is good (e.g., the signal quality is above the threshold)
  • the UE may have less intention to perform frequent measurement for cell re-selection. Instead, the UE may spend more time and power on the CA/DC measurement, and thus need more radio resources for the CA/DC measurement.
  • FIG. 1 shows exemplary serving areas 110 and 120 within which a UE 100 may be located according to an embodiment of the disclosure.
  • the serving areas 110 and 120 can be a coverage center area and a coverage edge area of a serving cell 130, respectively.
  • a signal quality of a reference signal that the UE 100 receives from the serving cell 130 can be above a signal quality threshold, indicating that the UE 100 may have a good single quality in the serving area 110. Accordingly, the UE 100 may allocate more radio resources for the CA/DC measurement.
  • the UE 100 When the UE 100 is located within the serving area 120, the signal quality of the reference signal that the UE 100 receives from the serving cell 130 can be below the signal quality threshold, indicating the UE 100 may have a bad signal quality in the serving area 120. Accordingly, the UE 100 may allocate more radio resources for the re-selection measurement.
  • the signal quality can be reference signal received power (RSRP) , reference signal received quality (RSRQ) , or the like.
  • allocating radio resources for a measurement can include allocating a carrier that can be monitored and reported by the UE in the measurement.
  • the carrier is only monitored for EMR (e.g., CA/DC measurement) , then the carrier is a non-overlapping carrier.
  • the carrier is monitored for both EMR and mobility (e.g., re-selection measurement) , then the carrier is an overlapping carrier.
  • FIG. 2A shows an example in which there is overlapping carrier (s) between a re-selection measurement and a CA/DC measurement according to an embodiment of the disclosure.
  • Carriers 210 and 220 are monitored for the CA/DC measurement and the re-selection measurement, respectively.
  • the carriers 210 include overlapping carrier (s) 230 and non-overlapping carrier (s) 240.
  • the overlapping carrier (s) 230 can be monitored for both the CA/DC measurement and the re-selection measurement.
  • the non-overlapping carrier (s) 240 can only be monitored for the CA/DC measurement.
  • FIG. 2B shows an example in which there is no overlapping carrier (s) between the re-selection measurement and the CA/DC measurement according to an embodiment of the disclosure.
  • Carriers 250 and 260 are monitored for the CA/DC measurement and the re-selection measurement, respectively. Since there is no overlapping carrier (s) , all the carriers 260 are non-overlapping carriers.
  • whether a carrier is an overlapping carrier or a non-overlapping carrier can be dependent on a priority of the carrier and/or a signal quality of a serving cell.
  • Table 1 shows an example in which the overlapping carrier and non-overlapping carrier are dependent on the priority of the carrier and the signal quality of the serving cell.
  • S rxlev and S qual indicate RSRP and RSRQ, respectively.
  • S nonIntraSearchP and S nonIntraSearchQ are referred to as s-NonIntraSearch thresholds and indicate RSRP threshold and RSRQ threshold, respectively.
  • S rxlev ⁇ S nonIntraSearchP or S qual ⁇ S nonIntraSearchQ the signal quality of the serving cell is said to be bad.
  • S rxlev >S nonIntraSearchP and S qual >S nonIntraSearchQ the signal quality of the serving cell is said to be good.
  • the carrier can be measured no matter the signal quality of the serving cell is higher or lower than a threshold (e.g., s-NonIntraSearch thresholds) . Therefore, if the carrier is also configured as an EMR carrier, then the carrier is an overlapping carrier.
  • a threshold e.g., s-NonIntraSearch thresholds
  • the carrier can be measured only when the signal quality of the serving cell is lower than a threshold (e.g., s-NonIntraSearch thresholds) . Therefore, if the carrier is also configured as an EMR carrier, then the carrier is an overlapping carrier when the signal quality of the serving cell is lower than the threshold and becomes a non-overlapping carrier when the signal quality of the serving cell is higher than the threshold.
  • a threshold e.g., s-NonIntraSearch thresholds
  • an overall measurement capability of the UE in the idle mode can include the carriers monitored for EMR and the carriers monitored for mobility.
  • the overall measurement capability of the UE in the idle mode may vary for different scenarios.
  • the monitoring carriers can be 8 and 3 for the re-selection measurement and the CA/DC measurement, respectively. Therefore, the overall measurement capability of the UE can range from 8 to 11 carriers, depending on the number of the overlapping carriers between the re-selection measurement and the CA/DC measurement.
  • the UE may report more carriers for the CA/DC measurement when a signal quality of a serving cell where the UE is allowed to camp on is bad, as shown in Table 2.
  • S rxlev and S qual indicate RSRP and RSRQ, respectively.
  • S nonIntraSearchP and S nonIntraSearchQ indicate RSRP threshold and RSRQ threshold, respectively.
  • S rxlev ⁇ S nonIntraSearchP or S qual ⁇ S nonIntraSearchQ the signal quality of the serving cell is said to be bad and the number of reporting carriers for EMR is 3, in which 0 or 1 inter-frequency carrier may be a non-overlapping carrier.
  • S rxlev >S nonIntraSearchP and S qual >S nonIntraSearchQ the signal quality of the serving cell is said to be good and the number of reporting carriers for EMR is 1, in which 0 or 1 inter-frequency carrier may be a non-overlapping carrier. Therefore, it can be seen that the number of reporting carriers for good signal quality is smaller than the number of reporting carriers for bad signal quality.
  • the type of the reporting carriers for EMR may be restricted. That is, 0 or 1 inter-frequency carrier in the reporting carriers for EMR may be a non-overlapping carrier, regardless of the signal quality of the serving cell. This restriction may cause the UE to report an inter-frequency overlapping carrier with a low signal quality.
  • the UE monitors 8 carriers and the RSRPs of the 8 carriers are listed in Table 3. According to the rule in Table 2, the UE can report 3 inter-frequency carriers, in which 0 or 1 inter-frequency carrier may be a non-overlapping carrier.
  • the reporting carriers may be F1, F4, and F5, while the carriers F2 and F3 with higher RSRPs are not reported.
  • the reporting carriers may be F4, F5, and F6, while the carriers F1 –F3 with higher RSRPs are not reported. It can be seen that the restriction on the type of the reporting carriers for EMR can cause a carrier with a higher signal quality not to be reported.
  • the overall measurement capability of the UE supporting the idle mode CA/DC measurement is not extended. That is, the total number of monitoring carriers configured for the re-selection measurement and the CA/DC measurement is less than or equal to the total number of monitoring carriers configured only for the re-selection measurement.
  • Table 4 shows exemplary idle mode measurement capability in different modes. For both re-selection measurement and re-selection plus CA/DC measurement, 8, 10, and 14 carriers are monitored in LTE standalone (SA) excluding NR mode, LTE SA including NR mode, and NR SA mode, respectively.
  • SA LTE standalone
  • the type of the reporting carriers for EMR is not restricted. That is, there is no restriction on the number of the overlapping carriers and/or the non-overlapping carriers
  • the number of monitoring carriers when a signal quality of a serving cell is not larger than a threshold is less than the number of monitoring carriers when the signal quality of the serving cell is higher than the threshold.
  • the number of monitoring carriers is X1.
  • S rxlev >S nonIntraSearchP and S qual >S nonIntraSearchQ the number of monitoring carriers is X2, which is greater than X1, i.e., X2>X1.
  • the number of reporting carriers when a signal quality of a serving cell is not larger than a threshold is not larger than the number of reporting carriers when signal qualities of all interested serving cell are higher than the threshold.
  • the number of monitoring carriers is Y1.
  • S rxlev >S nonIntraSearchP and S qual >S nonIntraSearchQ the number of monitoring carriers is Y2, which is greater than or equal to Y1, i.e., Y2 ⁇ Y1.
  • FIG. 3 shows a flowchart outlining an exemplary process 300 according to embodiments of the disclosure.
  • the process 300 is executed by processing circuitry, such as processing circuitry in the UE supporting idle mode CA/DC measurement.
  • the process 300 is implemented in software instructions, thus when the processing circuitry executes the software instructions, the processing circuitry performs the process 300.
  • the process 300 may generally start at step S301, where the process 300 determines whether the UE is in an idle mode and able to perform CA/DC measurement in the idle mode. When the UE is determined to be in the idle mode and not able to perform the CA/DC measurement in the idle mode, the process 300 proceeds to step S302. When the UE is determined to be in the idle mode and able to perform the CA/DC measurement in the idle mode, the process 300 proceeds to step S303.
  • the process 300 monitors a first plurality of carriers for re-selection measurement.
  • step S303 the process 300 monitors a second plurality of carriers for at least one of the CA/DC measurement and the re-selection measurement.
  • An upper limit of a total number of the first plurality of carriers is equal to an upper limit of a total number of the second plurality of carriers. Then, the process proceeds to step S304.
  • step S304 the process 300 performs the CA/DC measurement on a subset of the second plurality of carriers. Then, the process 300 proceeds to step S305.
  • the process 300 reports the CA/DC measurement to a BS when the UE is in a connected mode. Then, the process 300 terminates.
  • the process 300 determines that the UE is able to perform the CA/DC measurement in the idle mode when the CA/DC measurement is supported by both the UE and the BS.
  • the process 300 determines that the UE is not able to perform the CA/DC measurement in the idle mode when the CA/DC measurement is not supported by at least one of the UE and the BS.
  • the process 300 detects a cell identification of a neighboring cell with the first plurality of carriers.
  • the process 300 measures a signal quality of the neighboring cell with the first plurality of carriers.
  • one of the second plurality of carriers is an overlapping carrier when the carrier is monitored for both the CA/DC measurement and the re-selection measurement.
  • one of the second plurality of carriers is a non-overlapping carrier when the carrier is monitored for the CA/DC measurement and not monitored for the re-selection measurement.
  • the process 300 performs the CA/DC measurement on a first subset of the second plurality of carriers when one of signal qualities of a serving cell is less than or equal to a threshold.
  • the process 300 performs the CA/DC measurement on a second subset of the second plurality of carriers when all of the signal qualities of the serving cell is greater than the threshold.
  • a total number of the first subset of the second plurality of carriers is less than or equal to a total number of the second subset of the second plurality of carriers.
  • the signal qualities include at least one of reference signal received power (RSRP) and reference signal received quality (RSRQ) .
  • the total number of the second plurality of carriers is one of 8, 10, and 14.
  • FIG. 4 shows an exemplary apparatus 400 according to embodiments of the disclosure.
  • the apparatus 400 can be configured to perform various functions in accordance with one or more embodiments or examples described herein.
  • the apparatus 400 can provide means for implementation of techniques, processes, functions, components, and systems described herein.
  • the apparatus 400 can be used to implement functions of the BS 103 in various embodiments and examples described herein.
  • the apparatus 400 can include a general purpose processor or specially designed circuits to implement various functions, components, or processes described herein in various embodiments.
  • the apparatus 400 can include processing circuitry 410, a memory 420, a radio frequency (RF) module 430, and an antenna array 440.
  • RF radio frequency
  • the processing circuitry 410 can include circuitry configured to perform the functions and processes described herein in combination with software or without software.
  • the processing circuitry 410 can be a digital signal processor (DSP) , an application specific integrated circuit (ASIC) , programmable logic devices (PLDs) , field programmable gate arrays (FPGAs) , digitally enhanced circuits, or comparable device or a combination thereof.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • digitally enhanced circuits or comparable device or a combination thereof.
  • the processing circuitry 410 can be a central processing unit (CPU) configured to execute program instructions to perform various functions and processes described herein.
  • the memory 420 can be configured to store program instructions.
  • the processing circuitry 410 when executing the program instructions, can perform the functions and processes.
  • the memory 420 can further store other programs or data, such as operating systems, application programs, and the like.
  • the memory 420 can include a read only memory (ROM) , a random access memory (RAM) , a flash memory, a solid state memory, a hard disk drive, an optical disk drive, and the like.
  • the RF module 430 receives a processed data signal from the processing circuitry 410 and converts the data signal to a wireless signal that is then transmitted via the antenna array 440, or vice versa.
  • the RF module 430 can include a digital to analog convertor (DAC) , an analog to digital converter (ADC) , a frequency up convertor, a frequency down converter, filters and amplifiers for reception and transmission operations.
  • the RF module 430 can include multi-antenna circuitry for beam forming operations.
  • the multi-antenna circuitry can include an uplink spatial filter circuit, and a downlink spatial filter circuit for shifting analog signal phases or scaling analog signal amplitudes.
  • the apparatus 400 can optionally include other components, such as input and output devices, additional or signal processing circuitry, and the like. Accordingly, the apparatus 400 may be capable of performing other additional functions, such as executing application programs, and processing alternative communication protocols.
  • the processes and functions described herein can be implemented as a computer program which, when executed by one or more processors, can cause the one or more processors to perform the respective processes and functions.
  • the computer program may be stored or distributed on a suitable medium, such as an optical storage medium or a solid-state medium supplied together with, or as part of, other hardware.
  • the computer program may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems.
  • the computer program can be obtained and loaded into an apparatus, including obtaining the computer program through physical medium or distributed system, including, for example, from a server connected to the Internet.
  • the computer program may be accessible from a non-transitory computer-readable medium providing program instructions for use by or in connection with a computer or any instruction execution system.
  • the computer readable medium may include any apparatus that stores, communicates, propagates, or transports the computer program for use by or in connection with an instruction execution system, apparatus, or device.
  • the computer-readable medium can be magnetic, optical, electronic, electromagnetic, infrared, or semiconductor system (or apparatus or device) or a propagation medium.
  • the computer-readable medium may include a computer-readable non-transitory storage medium such as a semiconductor or solid state memory, magnetic tape, a removable computer diskette, a random access memory (RAM) , a read-only memory (ROM) , a magnetic disk and an optical disk, and the like.
  • the computer-readable non-transitory storage medium can include all types of computer readable medium, including magnetic storage medium, optical storage medium, flash medium, and solid state storage medium.

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Abstract

Sous certains aspects, l'invention concerne des appareils et des procédés de communication sans fil. Un appareil comprend un circuit de traitement qui surveille une première pluralité de porteuses pour une mesure de resélection lorsque l'appareil est en mode repos et ne peut pas effectuer une mesure d'agrégation de porteuses (CA) et de connectivité double (DC) dans le mode repos. Lorsque l'appareil est capable d'effectuer la mesure CA/DC dans le mode repos, le circuit de traitement surveille une seconde pluralité de porteuses pour la mesure CA/DC et/ou la mesure de resélection. Une limite supérieure d'un nombre total de la première pluralité de porteuses est égale à une limite supérieure d'un nombre total de la seconde pluralité de porteuses. Le circuit de traitement réalise la mesure CA/DC sur un sous-ensemble de la seconde pluralité de porteuses et rapporte la mesure CA/DC à une station de base lorsque l'appareil est dans un mode connecté.
PCT/CN2020/109312 2019-08-14 2020-08-14 Mesure d'agrégation de porteuses et de connectivité double en mode repos WO2021027939A1 (fr)

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WO2023279244A1 (fr) * 2021-07-05 2023-01-12 北京小米移动软件有限公司 Procédé et appareil de configuration de resélection de cellule, et dispositif de communication et support de stockage

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