WO2017138869A1 - Adaptation d'une mesure pour un internet des objets à bande étroite - Google Patents

Adaptation d'une mesure pour un internet des objets à bande étroite Download PDF

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Publication number
WO2017138869A1
WO2017138869A1 PCT/SE2017/050114 SE2017050114W WO2017138869A1 WO 2017138869 A1 WO2017138869 A1 WO 2017138869A1 SE 2017050114 W SE2017050114 W SE 2017050114W WO 2017138869 A1 WO2017138869 A1 WO 2017138869A1
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Prior art keywords
wireless device
cell
measurement
type
reference signal
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PCT/SE2017/050114
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English (en)
Inventor
Santhan THANGARASA
Stéphane TESSIER
Joakim Axmon
Muhammad Kazmi
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Telefonaktiebolaget Lm Ericsson (Publ)
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Publication of WO2017138869A1 publication Critical patent/WO2017138869A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver

Definitions

  • This disclosure relates to wireless communication and in particular, a method, wireless device and network node for adapting measurement for narrowband Internet of Things (NB-IOT).
  • NB-IOT narrowband Internet of Things
  • Machine-to-machine (M2M) communication also known as machine type communication (MTC) or Internet of Things (IoT) is used for establishing communication between machines and between machines and humans.
  • the communication may include the exchange of data, signaling, measurement data, configuration information, etc.
  • the device size may vary from that of a wallet to that of a base station.
  • the IoT devices are quite often used for applications like sensing environmental conditions (e.g., temperature reading), metering or measurement (e.g., electricity usage, etc.), fault finding or error detection, etc. In these applications, the IoT devices are active very seldom but over a consecutive duration depending upon the type of service, e.g., about 200 ms once every 2 seconds, about 500 ms every 60 minutes, etc.
  • the IoT device may also perform measurement on other frequencies or other radio access technologies (RATs).
  • RATs radio access technologies
  • the path loss between a wireless IoT device and a base station can be very large in some scenarios, such as when used as a sensor or metering device located in a remote location such as in the basement of the building. In these scenarios, the adequate reception of the signal from a base station may be difficult. For example, the path loss can be worse than 20 dB compared to normal operation.
  • the coverage in the uplink (from the wireless device to the base station) and/or in the downlink (from the base station to the wireless device) has to be substantially enhanced with respect to the normal or legacy coverage. This is realized by employing one or more advanced techniques in the wireless IoT device and/or in the radio network node for enhancing the coverage.
  • Some non-limiting examples of such advanced techniques are transmit power boosting, repetition of transmitted signal, applying additional redundancy to the transmitted signal, use of advanced/enhanced receiver, etc.
  • the IoT when employing such coverage enhancing techniques, the IoT is regarded to be operating in "coverage enhancing mode" or coverage extending mode.
  • a low complexity wireless device for example one having only a single receiver, may also be capable of supporting an enhanced coverage mode of operation.
  • the coverage level of the wireless device with respect to a cell may be expressed in terms of signal level such as signal quality, signal strength or path loss with respect to that cell.
  • Radio measurements performed by the wireless device are typically performed on the serving as well as on neighbor cells over some known reference symbols or pilot sequences.
  • the measurements are performed on cells on an intra-frequency carrier, inter-frequency carrier(s) as well as on inter-radio access technology (RAT) carriers(s), depending upon the whether the wireless device supports that RAT.
  • RAT inter-radio access technology
  • the network has to configure the measurement gaps.
  • LTE long term evolution
  • PCI physical cell identity
  • RSRP Reference Symbol Received Power
  • RSRQ Reference Symbol Received Quality
  • SI system information
  • CGI cell global ID
  • RSTD Reference Signal Time Difference
  • CSI Channel state information
  • the DL subframe # 0 and subframe # 5 carry synchronization signals (i.e., both primary synchronization signal (PSS) and secondary synchronization signal (SSS)).
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • the wireless device In order to identify an unknown cell (e.g., a new neighbor cell) the wireless device has to acquire the timing of that cell and eventually the physical cell identification (PCI). This is called a cell search or cell identification or even cell detection. Subsequently, the wireless device also measures RSRP and/or RSRQ of the newly identified cell in order to use itself and/or report the measurement to the network node. In total there are 504 PCIs.
  • the cell search is also a type of
  • the wireless device In radio resource control (RRC) idle state, the wireless device performs measurements (e.g. RSRP, RSRQ, reference signal-signal to interference plus noise ratio (RS-SINR), etc.) for cell selection and reselection purposes.
  • measurements e.g. RSRP, RSRQ, reference signal-signal to interference plus noise ratio (RS-SINR), etc.
  • the wireless device When camped on a cell, the wireless device regularly searches for a better cell according to the cell reselection criteria. If a better cell is found, that cell is selected.
  • the change of cell may imply a change to a new cell within the same radio access technology (RAT) or to a cell of a different RAT. That is, the wireless device performs intra-frequency, inter-frequency or inter-RAT cell reselection.
  • the cell reselection is performed by the wireless device autonomously based on the network configured parameters e.g., absolute radio frequency channel number (ARFCN) of carriers, signal
  • the wireless device identifies new intra-frequency cells and performs RSRP and RSRQ measurements of identified intra-frequency cells without an explicit intra- frequency neighbor list containing physical layer cell identities.
  • the wireless device is able to evaluate whether a newly detectable intra-frequency cell meets the reselection criteria within a pre-defined time period. This time is defined as a function of the discontinuous transmission (DRX) cycle used in idle state.
  • DRX discontinuous transmission
  • NB-IOT Narrow Band Internet of Things
  • IOT internet of things
  • E-UTRA evolved universal terrestrial radio access
  • the NB-IOT carrier bandwidth (BW) (BW2) is 200 KHz.
  • Examples of operating bandwidth (BWl) of LTE are 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz etc.
  • guard-band operation utilizing the unused resource blocks within a LTE carrier's guard-band.
  • the term guard-band may also interchangeably be called guard bandwidth.
  • the guard-band operation of NB-IOT can be placed anywhere outside the central 18 MHz but within 20 MHz LTE BW.
  • ⁇ -band operation' utilizing resource blocks within a normal LTE carrier.
  • the in-band operation may also interchangeably be called in-bandwidth operation.
  • the operation of one RAT within the BW of another RAT is also called in- band operation.
  • Bwl 10 MHz or 50 RBs
  • NB-IOT operation over one resource block (RB) within the 50 RBs is called in- band operation.
  • NB-IOT the downlink transmission is based on orthogonal frequency division multiplexing (OFDM) with 15kHz subcarrier spacing for all three scenarios: stand-alone, guard-band, and in-band.
  • OFDM orthogonal frequency division multiplexing
  • SC-FDMA single carrier frequency division multiple access
  • MIB master information broadcast
  • SIB system information broadcast
  • NB-IoT supports both downlink physical control channel (NB-PDCCH, or NB-M-PDCCH) and downlink physical shared channel (PDSCH).
  • NB-PDCCH downlink physical control channel
  • PDSCH downlink physical shared channel
  • the operation mode of NB-IOT must be indicated to the wireless device, and currently 3GPP consider indication by means of NB-SSS, NB-MIB or perhaps other downlink signals.
  • NB-PSS primary synchronization signals
  • NB-SSS secondary synchronization signals
  • NB-IOT is a new radio access technology/feature based on LTE technology that is currently being specified in the third generation partnership project (3GPP).
  • the NB-IOT device has to perform measurements on received downlink signals from the serving- and/or identified neighbor cells. Since NB-IOT is a new feature, measurement procedures have not yet been specified. Different options for measurement technology are being considered.
  • NB-IOT Compared to the legacy LTE measurement procedure is that wireless device bandwidth is reduced to 1 PRB only.
  • the existing measurement which is based on cell specific reference signals (CRS) on at least 6 PRBs, may not work very well for the NB-IoT. Going from a wireless device bandwidth of 6 PRBs to 1 PRB means that the number of resource elements available for measurement is significantly reduced, and that will affect the measurement accuracy as well as measurement time/rate.
  • the NB-IOT wireless device may be capable of two or more operational modes, i.e., stand-alone, guard-band, and in-band modes. This may further impact the measurement procedure of the wireless device.
  • Some embodiments advantageously provide a method, wireless device and network node for configuring measurements of narrowband Internet of Things.
  • a method in a network node serving a wireless device includes determining reference signal, RS, type configuration information indicating one of (a) whether the wireless device is to use only one type of reference signal for performing at least one radio measurement on at least one cell, and (b) whether the wireless device is to use a combination of at least two types of reference signals for performing at least one radio measurement on at least one cell.
  • the determining of RS type configuration information is based on criteria that includes a signal level.
  • the method also includes sending the RS type configuration information to the wireless device to configure the wireless device to perform at least one radio measurement on at least one cell based on the RS type configuration information.
  • the signal level is one of signal quality, signal strength and path loss with respect to the at least one cell.
  • a type of reference signal is one of a cell specific reference signal, CRS, a demodulation reference signal, DMRS, a channel state indication reference signal, CRS-RS, a primary synchronization signal, and a secondary synchronization signal.
  • the at least one measurement is based on estimated channel quality of a cell to be measured.
  • RS type configuration information is specific to one of a particular cell, a group of cells, all cells on a same carrier frequency, all cells on all configured carrier frequencies, and a particular type of measurement.
  • the type of reference signal employed depends on a signal quality measurement.
  • processing circuitry is configured to determine reference signal, RS, type configuration information indicating one of (a) whether the wireless device is to use only one type of reference signal for performing at least one radio measurement on at least one cell, and (b) whether the wireless device is to use a combination of at least two types of reference signals for performing at least one radio measurement on at least one cell.
  • the determining of RS type configuration information is based on criteria that includes a signal level.
  • the processing circuitry is also configured to send the RS type configuration information to the wireless device to configure the wireless device to perform at least one radio measurement on at least one cell based on the RS type configuration information
  • the signal level is one of signal quality, signal strength and path loss with respect to the at least one cell.
  • a type of reference signal is one of a cell specific reference signal, CRS, a demodulation reference signal, DMRS, a channel state indication reference signal, CRS-RS, a primary synchronization signal, and a secondary synchronization signal.
  • the at least one measurement is based on estimated channel quality of a cell to be measured.
  • RS type configuration information is specific to one of a particular cell, a group of cells, all cells on a same carrier frequency, all cells on all configured carrier frequencies, and a particular type of measurement.
  • the type of RS employed depends on a signal quality measurement.
  • a network node for serving a wireless device includes an RS type configuration information determination module is configured to determine reference signal, RS, type configuration information indicating one of (a) whether the wireless device is to use only one type of reference signal for performing at least one radio measurement on at least one cell, and (b) whether the wireless device is to use a combination of at least two types of reference signals for performing at least one radio measurement on at least one cell.
  • the determining of RS type configuration information is based on criteria that includes a signal level.
  • a transmitter module configured to send the RS type configuration information to the wireless device to configure the wireless device to perform at least one radio measurement on at least one cell based on the RS type configuration information.
  • the determined RS type configuration information is received from a network node.
  • the signal level is one of signal quality, signal strength and path loss with respect to the at least one cell.
  • a type of reference signal is one of a cell specific reference signal, CRS, a demodulation reference signal, DMRS, a channel state indication reference signal, CRS-RS, a primary synchronization signal, and a secondary synchronization signal.
  • RS type configuration information is specific to one of a particular cell, a group of cells, all cells on a same carrier frequency, all cells on all configured carrier frequencies, and a particular type of measurement.
  • the type of reference signal employed depends on a signal quality measurement.
  • a wireless device includes processing circuitry configured to determine reference signal, RS, type configuration information indicating one of (a) whether the wireless device is to use only one type of reference signal for performing at least one radio measurement on at least one cell, and (b) whether the wireless device is to use a combination of at least two types of reference signals for performing at least one radio measurement on at least one cell.
  • the determining of RS type configuration information is based on criteria that includes a signal level.
  • the processing circuitry is further configured to perform at least one measurement on at least one cell based on the determined RS type configuration information.
  • FIG. 1 is a block of a wireless communication network constructed in accordance with principles set forth herein;
  • FIG. 3 is a block diagram of an alternative embodiment of a network node constructed in accordance with principles set forth herein;
  • FIG. 4 is a block diagram of a wireless device constructed in accordance with principles set forth herein;
  • FIG. 5 is a block diagram of an alternative embodiment of a wireless device constructed in accordance with principles set forth herein;
  • FIG. 6 is a flowchart of an exemplary process in a network node for determining an RS configuration type and configuring a wireless device;
  • FIG. 8 is a flowchart of an exemplary process performed by a wireless device
  • FIG. 9 is a flowchart of an exemplary process for determining an RS type at a network node.
  • FIG. 10 is a flowchart of an exemplary process for selecting and RS type and implementing a performance measurement by a wireless device.
  • bottom may be used solely to distinguish one entity or element from another entity or element without necessarily requiring or implying any physical or logical relationship or order between such entities or elements.
  • the network based on at least the signal to noise ratio (SNR) level of signals received from a cell on which the measurement is to be performed, the network (NW) adapts the type of signals that are transmitted on which the SNR) level of signals received from a cell on which the measurement is to be performed.
  • SNR signal to noise ratio
  • NW network adapts the type of signals that are transmitted on which the SNR
  • the wireless device adapts signals on which the measurement is performed to meet one or more pre-defined measurement requirements.
  • the network node may configure and/or signal the information on which the device should measure.
  • the receiving device may adapt its measurement procedure according to received configuration/signaling information. For example, the network node may configure the wireless device to measure according to configuration A when the quality of a reported measurement is greater than a certain threshold T, and it may configure the wireless device to measure according to configuration B when the quality of a reported measurement is below the threshold T.
  • Configuration A may include information on what type of reference signals the wireless device should measure (e.g., CRS), while configuration B may indicate that the wireless device should measure using synchronization signals, which are specific types of reference signals.
  • CRS reference signals
  • configuration B may indicate that the wireless device should measure using synchronization signals, which are specific types of reference signals.
  • different requirements apply.
  • reference signal is here used in a broad sense and may comprise for instance NB-IoT cell specific reference signals (CRS), NB-IoT specific demodulation reference signals (DM-RS), NB-IoT Primary Synchronization Signals, NB-IoT Secondary Synchronization Signals, channels with known or predictable contents, NB-IoT specific discovery signals, etc.
  • CRS NB-IoT cell specific reference signals
  • DM-RS NB-IoT specific demodulation reference signals
  • NB-IoT Primary Synchronization Signals NB-IoT Secondary Synchronization Signals
  • channels with known or predictable contents NB-IoT specific discovery signals, etc.
  • FIG. 1 is a block of a wireless communication network 10, including a network cloud 16, network nodes 20 A and 20B, herein referred to collectively as network nodes 20, and wireless devices 40A and 40B, herein referred to collectively as wireless devices 40.
  • Network nodes 20 may be base stations which may be in communication with one another by an X2 interface.
  • the cloud 16 may include the Internet and/or the public switched telephone network (PSTN) and may include a backhaul network for the network nodes 20.
  • PSTN public switched telephone network
  • the network nodes 20 are in
  • a network node 20 constructed in accordance with principles set forth herein include an RS type configuration determiner 30 which is configured to determine what types of reference signals the wireless device 40 should measure.
  • a wireless device 40 constructed in accordance with principles set forth herein include an RS type configuration selector 50 which is configured to select one of a plurality of RS the wireless device 40 should measure.
  • each network node 20 may serve multiple cells which are different geographical coverage areas.
  • the wireless device 40 herein can be any type of wireless device capable of communicating with a network node 20 or another wireless device over radio signals.
  • the wireless device 40 may also be a radio communication device, target device, device to device (D2D) wireless device , machine type wireless device or wireless device capable of machine to machine communication (M2M), low-cost and/or low- complexity wireless device , a sensor equipped with wireless device, Tablet, mobile terminals, smart phone, laptop embedded equipped (LEE), laptop mounted equipment (LME), USB dongles, Customer Premises Equipment (CPE), an Internet of Things (IoT) device, or a Narrowband IoT (NB-IOT) device, etc.
  • D2D device to device
  • M2M machine to machine communication
  • M2M machine to machine communication
  • M2M machine to machine communication
  • Low-cost and/or low- complexity wireless device a sensor equipped with wireless device, Tablet, mobile terminals, smart phone, laptop embedded equipped (LEE), laptop mounted equipment (LME), USB dongles, Customer Premise
  • the wireless device 40 may be configured with PCell and PSCell or with PCell, PSCell and one or more SCells such as in dual connectivity and/or carrier aggregation.
  • the configured cells are wireless device specific serving cells of the wireless device 40.
  • FIG. 2 is a block diagram of an example network node 20 including processing circuitry 22.
  • the processing circuitry may include a memory 24 and processor 26, the memory 24 containing instructions which, when executed by the processor 26, configure processor 26 to perform the one or more functions described herein.
  • processing circuitry 22 may comprise integrated circuitry for processing and/or control, e.g., one or more processors and/or processor cores and/or FPGAs (Field Programmable Gate Array) and/or ASICs (Application Specific Integrated Circuitry).
  • Processing circuitry 22 may include and/or be connected to and/or be configured for accessing (e.g., writing to and/or reading from) memory 24, which may include any kind of volatile and/or non-volatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only
  • memory 24 may include any kind of volatile and/or non-volatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only
  • Such memory 24 may be configured to store code executable by control circuitry and/or other data, e.g., data pertaining to communication, e.g., configuration and/or address data of nodes, etc.
  • Processing circuitry 22 may be configured to control any of the methods described herein and/or to cause such methods to be performed, e.g., by processor 26.
  • Corresponding instructions may be stored in the memory 24, which may be readable and/or readably connected to the processing circuitry 22.
  • processing circuitry 22 may include a controller, which may comprise a microprocessor and/or microcontroller and/or FPGA (Field- Programmable Gate Array) device and/or ASIC (Application Specific Integrated Circuit) device. It may be considered that processing circuitry 22 includes or may be connected or connectable to memory, which may be configured to be accessible for reading and/or writing by the controller and/or processing circuitry 22.
  • the memory is configured to store RS type configuration information 28 as determined by an RS type configuration information determiner 30.
  • the RS type configuration information specifies (a) whether the wireless device 40 is to use only one type of reference signal for performing at least one radio measurement on at least one cell, and (b) whether the wireless device 40 is to use a combination of at least two types of reference signals for performing at least one radio measurement on at least one cell.
  • the determining of RS type configuration information is based on criteria that includes a signal level.
  • a receiver 34 is configured to receive channel measurement data from the wireless device 40.
  • a transmitter 36 is configured to send the RS type configuration information to the wireless device 40.
  • FIG. 4 is a block diagram of a wireless device 40 that includes processing circuitry 42.
  • the processing circuitry may include a memory 44 and processor 46, the memory 44 containing instructions which, when executed by the processor 46, configure processor 46 to perform the one or more functions described herein.
  • processing circuitry 42 may comprise integrated circuitry for processing and/or control, e.g., one or more processors and/or processor cores and/or FPGAs (Field Programmable Gate Array) and/or ASICs (Application Specific Integrated Circuitry).
  • Processing circuitry 42 may include and/or be connected to and/or be configured for accessing (e.g., writing to and/or reading from) memory 44, which may include any kind of volatile and/or non-volatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only
  • memory 44 may include any kind of volatile and/or non-volatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only
  • the memory 44 is configured to store RS type configuration information 48 received from a network node or generated by the wireless device 40 and to perform the functions described herein with respect to the wireless device 40.
  • the RS type configuration information 48 indicates (a) whether the wireless device is to use only one type reference signal for performing at least one radio measurement on at least one cell, and (b) whether the wireless device is to use a combination of at least two types of reference signals for performing at least one radio measurement on at least one cell.
  • the RS type configuration information may be received from the network node 20 or determined by the wireless device 40 based on criteria that includes a signal level.
  • the processor 46 is configured to implement an RS type configuration selector 50 configured to select one of a plurality of optional RS configuration types based on the RS type configuration information 48.
  • the processor 46 is also configured to perform a radio measurement 53 based on the selected RS configuration type.
  • the receiver 54 is configured to receive RS type configuration information from a network node 20 and the transmitter 56 is configured to transmit performance measurements to the network no
  • FIG. 5 is a block diagram of an alternative wireless device 40.
  • the wireless device 40 includes a memory module 44 that is configured to store RS type configuration information 48.
  • the wireless device 40 includes an RS type
  • a method in a wireless device 40 served by a first cell by a network node 20 may include:
  • a method in a wireless device 40 served by a first cell by a network node 20 includes:
  • FIG. 7 is a flowchart of an exemplary process performed by a wireless device
  • a type of RS configuration information based on the received configuration is determined via the RS type configuration selector 50 (block SI 10).
  • a measurement is performed by the wireless device 40 via the measurement performance unit 52 (block S112).
  • a RS type configuration selector 50 may select a combination of the first and second types of reference signals. Note also that embodiments are not limited to specification of only three types of reference signals, as more or less than three may be specified.
  • FIG. 9 is a flowchart of an exemplary process for determining an RS type at a network node 20.
  • the process includes determining, via the RS type configuration information determiner 30, reference signal, RS, type configuration information indicating one of (a) whether the wireless device 40 is to use only one type of reference signal for performing at least one radio measurement on at least one cell, and (b) whether the wireless device 40 is to use a combination of at least two types of reference signals for performing at least one radio measurement on at least one cell (block S124).
  • the process also further includes sending, via the transmitter 36, the determined RS type configuration information to configure the wireless device to perform at least one radio measurement on at least one cell (block S126).
  • FIG. 10 is a flowchart of an exemplary process for selecting and RS type and implementing a performance measurement by a wireless device 40.
  • the wireless device 40 may be served by a serving cell which has already been identified by the wireless device 40.
  • the wireless device 40 further identifies at least one other cell, which may be called a target cell or neighbor cell.
  • the serving cell and neighbor cell are served or managed by the first network node 20A and the second network node 20B, respectively.
  • the serving cell and neighbor cell are served or managed by the same network node 20, e.g. a first network node 20A.
  • the embodiments are applicable for a wireless device 40 in a low or in high activity state.
  • Examples of low activity state are RRC idle state, idle mode etc.
  • the wireless device 40 may be configured to operate in DRX or in non-record data.
  • the wireless device 40 may operate under normal coverage, extended coverage or extreme coverage with respect to its serving cell or the target cell on which the measurement is to be performed. These coverage classes are also interchangeably referred to as normal coverage and enhanced coverage in some cases.
  • the wireless device 40 may also operate in a plurality of coverage levels e.g. normal coverage, enhanced coverage level 1, enhanced coverage level 2, enhanced coverage level 3 and so on.
  • the coverage level may be expressed in terms of:
  • Examples of signal quality are S R, SINR, CQI, RSRQ, CRS Es/Iot, SCH Es/Iot, etc.
  • Examples of signal strength are path loss, RSRP, SCH RP, etc.
  • the notation Es/Iot is defined as ratio of:
  • CE2 Coverage enhancement level 2
  • CE3 Coverage enhancement level 3
  • CE4 Coverage enhancement level 4
  • the embodiments are described herein within the context of NB-IOT devices. However, the embodiments are applicable to any RAT or multi-RAT systems where a measurement configuration is adapted based on channel quality of the measured cells.
  • One embodiment includes a method in a network node 20, that is serving at least one wireless device 40 (e.g., NB-IOT device). This embodiment also applies to a method in network node 20 serving a plurality of wireless devices in a cell.
  • a wireless device 40 e.g., NB-IOT device
  • a wireless device 40 in RRC connected state may be configured by network node 20 with measurement configuration using a dedicated signaling e.g. via RRC signaling on a shared channel. All or a plurality of wireless devices 40 in RRC idle state in the same cell may be configured by network node 20 with measurement configuration using a common signaling e.g. via RRC signaling on a broadcast channel.
  • the method enables network node 20 to derive a measurement configuration which is customized for wireless device 40 or for a plurality of wireless devices in the cell.
  • the measurement configuration may comprise information on at least what type of signals (e.g., cell specific reference signals, synchronization signals, combination thereof, etc.) a wireless device 40 should measure on.
  • the first and the second types of reference signals differ in terms of non-limiting examples of one or more of the following physical layer aspects: • the density of RS in time and/or frequency e.g. number of subcarriers containing RS per RB, number of symbols containing RS per RB etc.;
  • An example of the first type of RS is CRS, e.g., NB-IOT related CRS.
  • An example of the second type of RS is synchronization signals, e.g., NB-IOT related secondary synchronization signal (SSS), primary synchronization signal (PSS) which are also known as NB-SSS and NB-PSS, etc.
  • SSS secondary synchronization signal
  • PSS primary synchronization signal
  • NB-SSS are transmitted with higher density in time and frequency compared to CRS in NB-IOT system.
  • the measurement configuration in the network node 20 may include at least the reference signal (RS) type information to be used by the wireless device 40 for the measurement. That is, the network node 20 indicates whether the wireless device 40 is to perform one or more measurements in one or more cells using:
  • RS reference signal
  • the network node 20 may indicate, as part of RS type information, whether the wireless device 40 is to perform one or more measurements in one or more cells using:
  • the first type of reference signal or • A combination of the first type of reference signal and the second type of reference signal.
  • the network node 20 may indicate, as part of RS type information, whether the wireless device 40 is to perform one or more measurements in one or more cells using:
  • the network node 20 may provide, as part of RS type information, a list of two or more sets of RS to the wireless device 40. Each set may contain one type of RS or plurality of RSs.
  • the wireless device 40 may autonomously determine, based on one or more criteria, the type of RS or
  • RS types to be used for performing one or more measurements on one or more cells.
  • criteria are signal quality (e.g., SINR) of the measured cell, coverage level of the cell, deployment mode (e.g., in-band, guard-band, standalone, etc.) of the measured cell, etc.
  • the criteria may be pre-defined or configured by the network node 20 at the wireless device 40.
  • wireless device 40 may be configured to use either the second type of RS (e.g., B-SSS) or a
  • the wireless device 40 may use only the second type of RS for doing measurement on that cell. But in case of enhanced coverage (e.g. SINR ⁇ - 6 dB) with respect to the measured cell the wireless device 40 may use a combination of the first and the second type of RSs for doing measurement on that cell.
  • normal coverage e.g., SINR > - 6 dB
  • enhanced coverage e.g. SINR ⁇ - 6 dB
  • the network node 20 determines that the wireless device 40 is to perform one or more radio measurements on one or more cells based on one, or a combination of more, reference signals.
  • Another type of information that the measurement configuration may include is information on which symbols to measure on, measurement period, filtering coefficient information etc.
  • the measurement configuration is derived based on at least reported channel state information.
  • channel state information examples include CQI, RSRP, RSRQ, RS-SINR, etc.
  • Another embodiment enables the network node 20 to derive a configuration related to measurement procedure which intends to reflect the current channel quality.
  • the configuration can be derived based on reported channel state information by the wireless device 40. If the target cell is already known to the wireless device 40, e.g., the wireless device 40 has already identified that cell, or the wireless device 40 has already performed some measurements on that cell, then the network node 20 may use such information to derive the configuration.
  • the configuration may enable the wireless device 40 to perform the measurement using the existing method, i.e., using CRS signals.
  • Tl could be predefined or a configurable parameter.
  • configuration may enable the wireless device 40 to perform measurement using an adaptive method, i.e., using synchronization signals (e.g. B-PSS, NB-SSS).
  • synchronization signals e.g. B-PSS, NB-SSS.
  • the configuration may enable the wireless device 40 to perform measurement using an adaptive method, i.e. using both CRS and synchronization signals (e.g. NB-PSS, NB-SSS).
  • the value of TO could be predefined or a configurable parameter.
  • the measurement performance of a measurement done using only the first type of RS may be worse compared to the second type of RS (e.g. NB-SSS signals).
  • Examples of measurement performance metric or criteria are measurement accuracy, measurement period, etc.
  • a measurement performance having a longer measurement period is worse than a performance having a shorter measurement period. This is because the density of NB-SSS can be higher, i.e., the number of resource elements containing the NB-SSS is much higher than the number of resource elements containing CRS.
  • the measurement performance using NB- SSS may result in improved accuracy.
  • the accuracy can be further improved since even more number of resource elements are used for measurement. Since the measurement accuracy becomes a function of type of signals used for measurement, the network node 20 may use this information to derive the measurement
  • the measurement performance can also be improved by adapting the measurement filtering coefficient.
  • a larger value of filtering coefficient may result in significantly improved accuracy in some cases (e.g., when the channel is not changing very much, or at low-mobility scenarios) while in other cases a smaller value can be preferred (e.g., at high Doppler scenarios).
  • a larger value means that the number of samples or averages used for achieving the measurement result is increased.
  • the adaptation in the network node 20 can be as follows:
  • Filtering coefficient 2 may correspond to a LI measurement period of 800 ms.
  • Es/Iot ⁇ -6 First type of 200 ms 1 Coherently dB reference within signal sample and non- coherently over the samples
  • Second type 800 ms 2 Coherently Es/Iot ⁇ - of reference within
  • One embodiment is a method in a wireless device 40 to obtain, acquire, or determine a configuration related to the measurement procedure from the network node 20.
  • the wireless device 40 uses the obtained configuration to adapt its measurement procedure to perform one or more measurements on a target cell.
  • the target cell may include the serving cell, and/or other neighbor cells.
  • the received measurement information includes at least the following two types of reference signals (a first type of reference signal and a second type of reference signal), and some additional information related to measurements that may include:
  • the first and the second types of reference signals differ in terms of non-limiting examples of one or more of the following physical layer aspects:
  • ⁇ o the density of RS in time and/or frequency e.g. number of subcarriers
  • RS containing RS per RB, number of symbols containing RS per RB, etc.; o the periodicity of occurrence of RS e.g. occurrence of a RB containing RS every 10 ms, every 20 ms, every 80 mc etc.;
  • An example of the first type of RS is CRS, e.g., NB-IOT related CRS.
  • An example of the second type of RS is synchronization signals, e.g., NB-IOT related SSS, PSS which are also known as NB-SSS and NB-PSSS, etc.
  • NB- SSS are transmitted with higher density in time and frequency compared to CRS in NB-IOT system.
  • the measurement configuration received from the network node 20 may include at least the reference signal (RS) type information to be used by the wireless device 40 for the measurement. That is the network node 20indicates whether the wireless device 40 is to perform one or more measurements in one or more cells using:
  • RS reference signal
  • the network node 20 may indicate, as part of RS type information, whether the wireless device 40 is to perform one or more measurements in one or more cells using:
  • the network node 20 may indicate, as part of RS type information, whether the wireless device 40 is to perform one or more measurements in one or more cells using:
  • the wireless device 40 will use the indicated 'RS type' or 'combination of RS types' to perform measurements on one or more cells.
  • the network node 20 may provide, as part of RS type information, a list of two or more sets of RS to the wireless device 40. Each set may contain one type of RS or plurality of RSs. In this case the wireless device 40 may autonomously determine, based on one or more criteria, the type of RS or
  • RS types to be used for performing one or more measurements on one or more cells.
  • criteria are signal quality (e.g., SINR) of the measured cell, coverage level of the cell, deployment mode (e.g., in-band, guard-band, stand- alone, etc.) of the measured cell etc.
  • the criteria may be pre-defined or configured by the network node 20 at the wireless device 40.
  • a wireless device 40 may be configured to use either the second type of RS (e.g., B-SSS) or a combination of the first and the second type of RSs (e.g. CRS and NB-SSS).
  • the wireless device 40 may use only the second type of RS to perform measurement on that cell. But in case of enhanced coverage (e.g., SINR ⁇ - 6 dB) with respect to the measured cell the wireless device 40 may use a combination of the first and the second type of RSs for doing measurement on that cell.
  • normal coverage e.g., SINR > - 6 dB
  • enhanced coverage e.g., SINR ⁇ - 6 dB
  • the RS type information provided by the network node 20 may be specific for one or more of the following:
  • Non-limiting examples of methods which can be implemented in the wireless device 40 for obtaining configuration related to measurement procedure are:
  • the wireless device 40 may obtain the configuration related to the measurement procedure from the serving network node 20, e.g., from network node 20 serving any of the serving cells such as PCell, SCell, PSCell, etc.
  • the wireless device 40 may also obtain the configuration related to measurement procedure from other network nodes, such as neighbor network nodes, core- network node, or other type of dedicated or non-dedicated nodes. For example, in this case the wireless device 40 may read the system information sent on a broadcast channel by the network node 20.
  • other network nodes such as neighbor network nodes, core- network node, or other type of dedicated or non-dedicated nodes.
  • the wireless device 40 may read the system information sent on a broadcast channel by the network node 20.
  • the wireless device 40 may also be pre-configured with full or partial
  • the wireless device 40 can be pre-configured with one or more parameters related to the measurement procedure in one or more of the following ways:
  • the wireless device 40 can retrieve the information when reading information on the SIM card and/or from the application program,
  • the type of signals to measure on, when those signals are transmitted, what symbols to measure on, etc. can be pre-defined.
  • the wireless device 40 may also obtain full or partial information on carrier
  • the wireless device 40 may also obtain the full or partial configuration of
  • the wireless device 40 may additionally obtain full or partial configuration of measurement procedure over the user plane by retrieving it from a server which may be under operator control or third party control.
  • the wireless device 40 upon obtaining the configuration, uses at least the obtained information to adapt its measurement procedure to perform one or more measurements on cells to be measured.
  • the measurements are performed by the wireless device 40 using the obtained measurement configuration also referred to as an adapted measurement procedure.
  • the wireless device 40 after performing the measurements, uses the measurement results for one or more tasks or operations. Examples of such tasks include but are not limited to:
  • wireless device 40 can adapt its measurement procedure.
  • the wireless device 40 may, based on, e.g., estimated channel quality (e.g., S R/SINR level), adapt the values of some of the parameters used to carry out the measurements.
  • the adaptation may include the wireless device 40 switching from measuring CRS signals to measuring synchronization signals at a certain point based on estimated channel quality.
  • the wireless device 40 may switch from measuring synchronization signals to measuring CRS.
  • the adaptation may include the wireless device 40 switching from CRS/synchronization signals to both CRS and synchronization signals, etc.
  • the wireless device 40 may further adapt one or more additional parameters used to perform the measurements based on the signal quality of the measured cell.
  • additional parameters to be adapted include the LI measurement period, the number of consecutive subframes, the types of averaging used for the
  • the wireless device 40 may adapt one or more parameters in accordance with the principles summarized in Table 2.
  • the adaptation of the measurement procedure may be realized by the wireless device 40 based on one or more of:
  • One or more pre-defined rules e.g., rules specified in the standard
  • wireless device 40 implementation-specific, i.e., decided by the wireless device 40 itself;
  • Examples of such information are estimated S R, SINR, CQI, RSRP, RSRQ, CRS, CRS Es/Iot, SCH Es/Iot.
  • the term, obtaining, here may imply that the wireless device 40 autonomously estimates the channel quality of the target cell, or wireless device 40 receives such information from other nodes (e.g. other network node, other devices, relays, etc.).
  • the wireless device 40 can decide whether to adapt its measurement procedure.
  • wireless device 40 may choose to adapt its procedure accordingly.
  • wireless device 40 may choose to adapt its measurement configuration procedure based on the comparison result in the previous step.
  • wireless device 40 has obtained measurement configuration from other nodes, and wireless device 40 has obtained information related to channel quality information on the cell to be measured.
  • wireless device 40 may choose to adapt its measurement procedure based on any combination of obtained measurement configuration and wireless device 40 estimated information on channel quality of target cell.
  • the wireless device 40 may also send information about pre-defined rule, configured/obtained rule and/or autonomously determined rule to other nodes and other wireless devices (e.g., D2D wireless devices) in its proximity.
  • the comparison step above may include numerous configuration thresholds which can in some cases also be pre-defined.
  • One embodiment enables the wireless device 40 to derive a configuration related to measurement procedure which reflects the current channel quality.
  • the configuration can be derived based on estimated channel state information of the cell to be measured. If the target cell is already known to the wireless device 40, e.g., the wireless device 40 may have already identified that cell, or the wireless device 40 may have already performed some measurements on that cell, then the wireless device 40 may use such historical information (e.g., estimated SINR, reported CQI, RSRP, etc. of that cell) to derive the configuration.
  • the wireless device 40 is able to dynamically adapt the values used to perform the measurement in order to meet the measurement requirements.
  • the measurement requirements in this case can be accuracy requirements (i.e., the uncertainty of measurement) or the delay of a measurement.
  • the adaptation in the wireless device 40 can be as follows: • when the estimated channel state information is high (e.g., SINR> threshold Tl), the configuration may enable the wireless device 40 to perform the measurement using existing method, i.e., using CRS signals.
  • Tl could be predefined or a configurable parameter.
  • configuration may enable the wireless device 40 to perform measurement using an adaptive method, i.e., using synchronization signals (e.g., B-PSS, NB-SSS).
  • synchronization signals e.g., B-PSS, NB-SSS.
  • the configuration may enable the wireless device 40 to perform measurement using an adaptive method, i.e., using both CRS and synchronization signals (e.g., NB-PSS, NB-SSS).
  • the value of TO could be predefined or a configurable parameter.
  • the measurement performance using only CRS signals may be worse compared to, e.g., NB-SSS signals.
  • NB-SSS the density of NB-SSS can be higher, i.e., the number of resource elements containing the NB-SSS is much higher than the number of resource elements containing CRS.
  • the measurement performance using NB-SSS may result in improved accuracy of the measurement.
  • the measurement is performed over both CRS and synchronization signals the accuracy can be further improved since even more number of resource elements are used for measurement. Since the measurement accuracy becomes a function of type of signals used for measurement, network node 20 may use this information to derive the measurement configuration which is later communicated to the wireless device 40.
  • the configuration may enable the wireless device 40 to perform the measurement using filtering coefficient 1.
  • Filtering coefficient 1 may correspond to a LI measurement period of 400 ms.
  • the value of Tl can be predefined or a configurable parameter.
  • Filtering coefficient 2 may correspond to a LI measurement period of 800 ms. • When the reported channel state information is very low, (e.g., SINR ⁇ T0, wherein T0 ⁇ T1), the configuration may enable the wireless device 40 to perform measurement using filtering coefficient 3. Filtering coefficient 3 may correspond to a LI measurement period of 1600 ms. The value of TO could be predefined or a configurable parameter.
  • the adaptation may be determined based on one or more of: the wireless device estimated channel state information (CSI), radio conditions, S R or SINR of the measured cell, etc.
  • CSI wireless device estimated channel state information
  • the measurement configuration may further include information on whether to use coherent or non-coherent averaging to perform the measurement.
  • information on whether to use coherent or non-coherent averaging to perform the measurement is shown in Table 2 below:
  • Es/Iot ⁇ -6 First type of 200 ms 1 Coherently dB reference within signal sample and non- coherently over the samples
  • Second type 400 Coherently Es/Iot ⁇ -6 of reference within signal sample and non- coherently over the samples -15 ⁇ Second type 800 ms 2 Coherently Es/Iot ⁇ - of reference within 10 signal sample and non- coherently over the samples
  • This embodiment is related to a transmitting network node 20 transmitting or signaling information to other nodes, the information being related to the
  • the wireless device 40 based on at least the channel state information (e.g., SINR, SNR, CQI, RSRP, RSRQ, RS- SI R, etc.).
  • channel state information e.g., SINR, SNR, CQI, RSRP, RSRQ, RS- SI R, etc.
  • radio network nodes e.g., eNode B, base station, access point, etc.
  • ProSe wireless devices ProSe relay wireless devices
  • IoT devices e.g., NB-IOT devices
  • core network nodes e.g., positioning nodes or any other node used for dedicated services such as self- organizing network (SON) nodes.
  • SON self- organizing network
  • One advantage is that the same or partial information may be applicable to other nodes in the network, and in that case the partial information can be reused. This way, the measurements can be improved in large scale.
  • a second advantage is that deriving the measurement configuration, which can be quite complex sometimes, can be done in one place and only once, and then signaled to other nodes in the network. This way, processing in the different nodes in the network can be reduced.
  • the network node 20 receiving this information may also adapt the parameters that are signaled by the network node 20 to the wireless device 40 as part of the measurement configuration.
  • Embodiment 1 A method in or for a network node serving a wireless device, the method including:
  • type configuration information indicating one of (a) whether the wireless device is to use only one type of reference signal for performing at least one radio measurement on at least one cell, and (b) whether the wireless device is to use a combination of at least two types of reference signals for performing at least one radio measurement on at least one cell;
  • Embodiment 2 A method in or for a wireless device, the method comprising: receiving from the network node at least reference signal, RS, type
  • the information indicating one of (a) whether the wireless device is to use only one type of reference signal for performing at least one radio measurement on at least one cell and (b) whether the wireless device is to use a combination of at least two types of reference signals for performing at least one radio measurement on at least one cell;
  • Embodiment 3 A method in or for a wireless device served in a first cell by a network node, the method comprising:
  • a first type of reference signal that can be used by the wireless device for performing one or more radio measurements on one or more cells
  • a second type of reference signal that can be used by the wireless device for performing one or more radio measurements on one or more cells
  • Embodiment 4 A wireless device, comprising:
  • a processor configured to:
  • RS reference signals
  • a first type of reference signal that can be used by the wireless device for performing one or more radio measurements on one or more cells
  • a second type of reference signal that can be used by the wireless device for performing one or more radio measurements on one or more cells
  • a network node comprising:
  • processing circuitry including a memory and a processor: the memory configured to store reference signal , RS, type configuration information;
  • the processor configured to:
  • RS type configuration information indicating one of whether the wireless device is to use only one type reference signal for performing at least one radio measurement on at least one cell and whether the wireless device is to use a combination of two or more types of reference signals for performing at least one radio measurement on at least one cell;
  • the wireless device configures the wireless device with the determined RS type configuration information to enable the wireless device to perform at least one radio measurement on at least one cell.
  • a network node comprising:
  • a memory module configured to store reference signal, RS, type configuration information
  • an RS type configuration determination module configured to determine RS type configuration information indicating one of whether the wireless device is to use only one type reference signal for performing at least one radio measurement on at least one cell and whether the wireless device is to use a combination of two or more types of reference signals for performing at least one radio measurement on at least one cell.
  • Embodiment 7 A wireless device, comprising:
  • processing circuitry including a memory and a processor:
  • the memory configured to store reference signal, RS, type configuration information
  • the processor configured to select based on one or more criteria one of the received RS type configurations and to use the received RS type information for performing at least one radio measurement on at least one cell.
  • Embodiment 8 A wireless device, comprising:
  • a memory module configured to store reference signal, RS, type configuration information
  • a selection module configured to select based on one or more criteria one of the received RS type configurations; and a measurement module configured to use the received RS type information for performing at least one radio measurement on at least one cell.
  • the wireless device configures the wireless device with the determined RS type configuration information to enable the wireless device to perform at least one radio measurement on at least one cell.
  • a method in a network node 20 serving a wireless device 40 includes determining reference signal, RS, type configuration information indicating one of (a) whether the wireless device 40 is to use only one type reference signal for performing at least one radio measurement on at least one cell, and (b) whether the wireless device 40 is to use a combination of at least two types of reference signals for performing at least one radio measurement on at least one cell (block S124).
  • the determining of RS type configuration information is based on criteria that includes a signal level.
  • the method also includes sending the RS type configuration information to the wireless device 40 to configure the wireless device 40 to perform at least one radio measurement on at least one cell based on the RS type configuration
  • the signal level is one of signal quality, signal strength and path loss with respect to the at least one cell.
  • a type of reference signal is one of a cell specific reference signal, CRS, a demodulation reference signal, DMRS, a channel state indication reference signal, CRS-RS, a primary synchronization signal, and a secondary synchronization signal.
  • the at least one measurement is based on estimated channel quality of a cell to be measured.
  • RS type configuration information is specific to one of a particular cell, a group of cells, all cells on a same carrier frequency, all cells on all configured carrier frequencies, and a particular type of measurement.
  • the type of reference signal employed depends on a signal quality measurement.
  • the signal level is one of signal quality, signal strength and path loss with respect to the at least one cell.
  • a type of reference signal is one of a cell specific reference signal, CRS, a demodulation reference signal, DMRS, a channel state indication reference signal, CRS-RS, a primary synchronization signal, and a secondary synchronization signal.
  • the at least one measurement is based on estimated channel quality of a cell to be measured.
  • RS type configuration information is specific to one of a particular cell, a group of cells, all cells on a same carrier frequency, all cells on all configured carrier frequencies, and a particular type of measurement.
  • the type of RS employed depends on a signal quality measurement.
  • a network node 20 for serving a wireless device 40 includes an RS type configuration information determination module 31 is configured to determine reference signal, RS, type configuration information indicating one of (a) whether the wireless device is to use only one type of reference signal for performing at least one radio measurement on at least one cell, and (b) whether the wireless device is to use a combination of at least two types of reference signals for performing at least one radio measurement on at least one cell.
  • the determining of RS type configuration information is based on criteria that includes a signal level, a transmitter module 36 configured to send the RS type configuration information to the wireless device 40 to configure the wireless device 40 to perform at least one radio measurement on at least one cell based on the RS type configuration information.
  • the determined RS type configuration information is received from a network node 20.
  • the signal level is one of signal quality, signal strength and path loss with respect to the at least one cell.
  • a type of reference signal is one of a cell specific reference signal, CRS, a demodulation reference signal, DMRS, a channel state indication reference signal, CRS-RS, a primary synchronization signal, and a secondary synchronization signal.
  • the at least one measurement is based on estimated channel quality of a cell to be measured.
  • RS type configuration information is specific to one of a particular cell, a group of cells, all cells on a same carrier frequency, all cells on all configured carrier frequencies, and a particular type of measurement.
  • the type of reference signal employed depends on a signal quality measurement.
  • a wireless device 40 includes processing circuitry 42 configured to determine reference signal, RS, type configuration information indicating one of (a) whether the wireless device 40 is to use only one type of reference signal for performing at least one radio measurement on at least one cell, and (b) whether the wireless device 40 is to use a combination of at least two types of reference signals for performing at least one radio measurement on at least one cell.
  • the determining of RS type configuration information is based on criteria that includes a signal level.
  • the processing circuitry 42 is further configured to perform at least one measurement on at least one cell based on the determined RS type configuration information.
  • the determined RS type configuration information is received from a network node 20.
  • the signal level is one of signal quality, signal strength and path loss with respect to the at least one cell.
  • a type of reference signal is one of a cell specific reference signal, CRS, a demodulation reference signal, DMRS, a channel state indication reference signal, CRS-RS, a primary synchronization signal, and a secondary synchronization signal.
  • the at least one measurement is based on estimated channel quality of a cell to be measured.
  • RS type configuration information is specific for one of a particular cell, a group of cells, all cells on a same carrier frequency, all cells on all configured carrier frequencies, and a particular type of measurement.
  • the type of reference signal employed depends on a signal quality measurement.
  • a wireless device 40 includes an RS type configuration information determination module 51 configured to determine reference signal, RS, type configuration information indicating one of (a) whether the wireless device 40 is to use only one type of reference signal for performing at least one radio measurement on at least one cell, and (b) whether the wireless device 40 is to use a combination of at least two types of reference signals for performing at least one radio measurement on at least one cell.
  • the determining of RS type configuration information is based on criteria that includes a signal level.
  • the wireless device 40 also includes a measurement performance module 53 configured to perform at least one measurement on the determined RS type on at least one cell. In some embodiments, performing the radio measurement is based on a first type of reference signal when the signal level is equal to or larger than a threshold, and performing the radio measurement is based on a combination of at least two types of reference signals when the signal level than the threshold.
  • the concepts described herein may be embodied as a method, data processing system, and/or computer program product. Accordingly, the concepts described herein may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects all generally referred to herein as a "circuit" or "module.” Furthermore, the disclosure may take the form of a computer program product on a tangible computer usable storage medium having computer program code embodied in the medium that can be executed by a computer. Any suitable tangible computer readable medium may be utilized including hard disks, CD-ROMs, electronic storage devices, optical storage devices, or magnetic storage devices.
  • These computer program instructions may also be stored in a computer readable memory or storage medium that can direct a computer or other
  • the computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.
  • Computer program code for carrying out operations of the concepts described herein may be written in an object oriented programming language such as Java® or C++.
  • the computer program code for carrying out operations of the disclosure may also be written in conventional procedural programming languages, such as the "C" programming language.
  • the program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer.
  • the remote computer may be connected to the user's computer through a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider).
  • LAN local area network
  • WAN wide area network
  • Internet Service Provider for example, AT&T, MCI, Sprint, EarthLink, MSN, GTE, etc.

Abstract

La présente invention concerne un procédé, un dispositif sans fil et un nœud de réseau destinés à adapter une mesure pour un internet des objets à bande étroite. Selon un aspect, un procédé dans un nœud de réseau desservant un dispositif sans fil dans un nœud de réseau desservant un dispositif sans fil consiste à déterminer des informations de configuration de type de signal de référence (RS pour Reference Signal) indiquant (a) si le dispositif sans fil doit utiliser seulement un type de signal de référence pour effectuer au moins une mesure radio sur au moins une cellule ou (b) si le dispositif sans fil doit utiliser une combinaison d'au moins deux types de signaux de référence pour effectuer au moins une mesure radio sur au moins une cellule. La détermination d'informations de configuration de type de signal RS est basée sur un critère qui comprend un niveau de signal. Les informations de configuration de type de signal RS sont envoyées au dispositif sans fil afin de configurer le dispositif sans fil pour effectuer au moins une mesure radio sur au moins une cellule sur la base des informations de configuration de type de signal RS.
PCT/SE2017/050114 2016-02-08 2017-02-07 Adaptation d'une mesure pour un internet des objets à bande étroite WO2017138869A1 (fr)

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WO2019036120A1 (fr) * 2017-08-18 2019-02-21 Qualcomm Incorporated Contrôle de liaison radio basé sur de multiples signaux de référence
CN109951264A (zh) * 2017-12-20 2019-06-28 上海诺基亚贝尔股份有限公司 用于通信的方法、设备以及计算可读介质
CN110022192A (zh) * 2018-01-09 2019-07-16 维沃移动通信有限公司 参考信号资源的测量方法、网络侧设备及用户侧设备
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CN113273254A (zh) * 2018-11-02 2021-08-17 诺基亚技术有限公司 用于测量配置的功耗降低方法

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