WO2019095198A1 - Neighbor monitoring in cellular communications network systems - Google Patents

Neighbor monitoring in cellular communications network systems Download PDF

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Publication number
WO2019095198A1
WO2019095198A1 PCT/CN2017/111343 CN2017111343W WO2019095198A1 WO 2019095198 A1 WO2019095198 A1 WO 2019095198A1 CN 2017111343 W CN2017111343 W CN 2017111343W WO 2019095198 A1 WO2019095198 A1 WO 2019095198A1
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WIPO (PCT)
Prior art keywords
predetermined time
time interval
defined threshold
threshold associated
serving cell
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PCT/CN2017/111343
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French (fr)
Inventor
Haitao Li
Li Zhang
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Nokia Shanghai Bell Co., Ltd.
Nokia Solutions And Networks Oy
Nokia Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Nokia Shanghai Bell Co., Ltd., Nokia Solutions And Networks Oy, Nokia Technologies Oy filed Critical Nokia Shanghai Bell Co., Ltd.
Priority to PCT/CN2017/111343 priority Critical patent/WO2019095198A1/en
Priority to CN201780096939.4A priority patent/CN111373787A/en
Publication of WO2019095198A1 publication Critical patent/WO2019095198A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • 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]

Definitions

  • the present invention relates to neighbor monitoring in cellular communications network systems.
  • the present invention can be applied in 3GPP systems utilizing eMTC and NB-IoT.
  • relaxed monitoring for cell (re-) selection can be enabled e.g. by (re-) configuration of the UE.
  • At least one embodiment of the present invention aims at optimizing UE power consumption.
  • Fig. 1 shows a flowchart illustrating a neighbor monitoring process according to at least some embodiments of the invention.
  • Fig. 2 shows a flowchart illustrating a threshold provision process according to at least some embodiments of the invention.
  • Fig. 3 shows a schematic block diagram illustrating a configuration of control units in which examples of embodiments of the invention are implementable.
  • At least some embodiments of the invention are applicable to a UE of a cellular communications network system.
  • the UE monitors a serving cell of a radio access network of the cellular communications network system, wherein the serving cell provides access for the user equipment to the cellular communications network system.
  • the UE also monitors neighboring cells of the radio access network, which are in the vicinity of the serving cell. The monitoring is performed with a predetermined time interval, which may be same or different for serving cell and neighboring cell (s) .
  • the UE dynamically determines whether to apply relaxed monitoring by change in serving cell RSRP.
  • configuration parameters for the dynamic determination whether to apply relaxed monitoring can be provided to the UE by means of system information.
  • UEs that apply relaxed monitoring need to perform neighbor cell measurements on a slow time scale, regardless if the UE considers itself to be stationary. An intention is that this shall not make it worse for any case with respect to power consumption.
  • the mechanism based on serving cell RSRP change works well for stationary UEs, however, it has the following problems:
  • an RSRP change by 1dB may have a completely different meaning for the time interval of 1s and one day.
  • Fig. 1 shows a flowchart illustrating a process of neighbor monitoring according to at least some embodiments of the invention.
  • the first predetermined time interval is a number N of paging cycles of the UE, where N may be 1, 2, 3 or a larger integer number depending on the paging cycle.
  • the UE measures a change of a received power of a reference signal from the serving cell, i.e. the serving cell′s RSRP change, within a second predetermined time interval.
  • the UE acquires the second predetermined time interval from network configuration.
  • the second predetermined time interval is inherent to the UE.
  • the second predetermined time interval may vary within the UE.
  • the second predetermined time internal that UE uses to take two RSRP results should not be taken beyond what the network configuration allows. For example, if the time interval in the network configured ′′time interval -RSRP change threshold′′ refers to an interval value range, then the second predetermined time interval that UE uses to take two RSRP results should only be taken from union of the signaled interval value ranges.
  • the UE acquires a defined threshold associated with the second predetermined time interval.
  • the UE decides whether to alter the first predetermined time interval based on a result of the comparing.
  • a ′′time interval -RSRP change threshold′′ table is signaled to the UE via broadcasting from the radio access network.
  • the time interval is a single interval value or an interval value range like [lower interval, higher interval] .
  • the UE compares two RSRP results with the corresponding RSRP change threshold in the table to evaluate whether it is ′′stationary′′ enough to relax neighbor monitoring or ′′mobile′′ enough to return from the relaxed neighbor monitoring to normal neighbor monitoring.
  • the two RSRP results taken for the comparison should be separated by at least this value.
  • the interval between two RSRP results taken for the comparison should fall into this range.
  • the UE calculates the defined threshold associated with the second predetermined time interval from a rule calculating the defined threshold from the second predetermined time interval of the UE. For example, the UE receives the rule via a broadcasting message from the radio access network.
  • Fig. 2 shows a flowchart illustrating a threshold provisioning process according to at least some embodiments of the invention.
  • step S31 the defined threshold associated with the second predetermined time interval is configured and, in step S32, the defined threshold is provided via a broadcasting message.
  • the above process is performed by an apparatus of the cellular communications network system.
  • different ′′time interval -RSRP change threshold′′ tables or rules are configured for different CE levels, to take each CE level′s measurement requirement into account.
  • two tables or rules are configured, one for normal coverage and the other for enhanced coverage.
  • two tables or rules are configured, one for CE mode A coverage and the other for CE mode B coverage.
  • the UE in addition to evaluating the serving cell′s RSRP change, the UE also tracks the change of its neighbor cell list to decide whether to alter the first predetermined time interval. For example, the UE performs relaxed neighbor monitoring based on the above-described serving cell′s RSRP check and no change of the neighbor cell list.
  • the UE tracks change of a list of the neighboring cells, and decides whether to alter the first predetermined time interval based on the result of the comparing and based on whether there is a change of the list. For example, in case the comparing provides the result that the measured change is below the defined threshold associated with the second predetermined time interval and there is no change of the list, the UE may extend the first predetermined time interval, e.g. perform the relaxed neighbor monitoring.
  • the UE applies the ′′time interval -RSRP change threshold′′ table or rule also to the neighbor cells in the list.
  • the UE also measures change of a received power of a reference signal from each of the neighboring cells within the first predetermined time interval, acquires a defined threshold associated with the first predetermined time interval, and compares the measured change of the received power of the reference signal from each of the neighboring cells with the defined threshold associated with the first predetermined time interval. Then, the UE decides whether to alter the first predetermined time interval based on a result of the comparing for the serving cell and each of the neighboring cells.
  • the defined threshold associated with the first predetermined time interval is acquired from the table defining the respective threshold for each of the plurality of time intervals for the measuring similar as described above with respect to the defined threshold associated with the second predetermined time interval.
  • the first predetermined time interval that UE uses to take two RSRP results should not be taken beyond what the network configuration allows. For example, if the time interval in the network configured ′′time interval -RSRP change threshold′′ refers to an interval value range, then the first predetermined time interval that UE uses to take two RSRP results should only be taken from union of the signaled interval value ranges.
  • the UE may extend the first predetermined time interval, e.g. perform the relaxed neighbor monitoring.
  • the defined threshold associated with the first predetermined time interval is configured in addition to or instead of the defined threshold associated with the second predetermined time interval, and, in step S32, the defined threshold associated with the first predetermined time interval is provided via a broadcasting message together with or separate from the defined threshold associated with the second predetermined time interval.
  • Measurement requirements of a UE in idle mode are defined in such a way that the UE should at least measure (monitor) the serving and neighbor cells every [N] paging cycles, where N can be 1, 2, 3 or a larger integer number depending on the paging cycle.
  • the UE is fully allowed to measure RSRP more frequently. So how often an RSRP result is generated at layer L1 of the UE is up to UE implementation, and it can be every 160ms for some UEs or every 40min for some other UEs (it can vary even with the same UE) .
  • the same change in RSRP like 1dB means different mobility level for 160ms and 40min.
  • the network side in order to align the frequency at which RSRP results are generated and taken for the comparison, the network side indicates a preferred RSRP measurement interval and corresponding threshold (defined threshold) as shown in Table I below.
  • the threshold should be different for normal and enhanced coverage modes.
  • the threshold to trigger the switch should be also larger, otherwise the UE may wrongly determine it is in ′′mobile′′ state just due to the measurement error. This means the threshold should be separately configured for different CE level.
  • the network side requires the UE to take neighbor cell measurement results into account when determining if it is ′′stationary′′ .
  • Fig. 3 illustrating a configuration of control units 10 and 40 in which examples of embodiments of the invention are implementable.
  • the control unit 10 is part of and/or is used by a UE of a cellular communications network system.
  • the control unit 10 executes the process shown in Fig. 1.
  • the control unit 40 is part of and/or is used by an apparatus of a cellular communications network system.
  • the control unit 40 executes the process shown in Fig. 2.
  • the control unit 10 comprises processing resources (processing circuitry) 11, memory resources (memory circuitry) 12 storing a program, and interfaces (interface circuitry) 13, which are coupled via a connection 14.
  • the interfaces 13 may comprise a suitable radio frequency (RF) transceiver (not shown) coupled to one or more antennas (not shown) for wireless communications over a connection 50 with the control unit 40 and for wireless communications over one or more wireless links with neighboring cells.
  • RF radio frequency
  • the control unit 40 comprises processing resources (processing circuitry) 41, memory resources (memory circuitry) 42 storing a program, and interfaces (interface circuitry) 43, which are coupled via a connection 44.
  • the interfaces 43 may comprise a suitable radio frequency (RF) transceiver (not shown) coupled to one or more antennas (not shown) for wireless communications over the connection 50 with the control unit 40.
  • RF radio frequency
  • connection or coupling means any connection or coupling, either direct or indirect, between two or more elements, and may encompass the presence of one or more intermediate elements between two elements that are ′′connected′′ or ′′coupled′′ together.
  • the coupling or connection between the elements can be physical, logical, or a combination thereof.
  • two elements may be considered to be ′′connected′′ or ′′coupled′′ together by the use of one or more wires, cables and printed electrical connections, as well as by the use of electromagnetic energy, such as electromagnetic energy having wavelengths in the radio frequency region, the microwave region and the optical (both visible and invisible) region, as non-limiting examples.
  • At least one of the programs stored in the memory resources 12, 42 is assumed to include program instructions that, when executed by the associated processing resources, enable the electronic device to operate in accordance with the exemplary embodiments of this invention, as detailed above.
  • the exemplary embodiments of this invention may be implemented by computer software stored in the memory resources 12 and executable by the processing resources 11 of the control unit 10 and similar for the other memory resources 42 and processing resources 41 of the control unit 40, or by hardware, or by a combination of software and/or firmware and hardware in any or all of the devices shown.
  • various embodiments of the UE can include, but are not limited to, mobile stations, cellular telephones, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and playback appliances having wireless communication capabilities, Internet appliances permitting wireless Internet access and browsing, as well as portable units or terminals that incorporate combinations of such functions.
  • PDAs personal digital assistants
  • portable computers having wireless communication capabilities
  • image capture devices such as digital cameras having wireless communication capabilities
  • gaming devices having wireless communication capabilities
  • music storage and playback appliances having wireless communication capabilities
  • Internet appliances permitting wireless Internet access and browsing, as well as portable units or terminals that incorporate combinations of such functions.
  • the memory resources 12, 42 may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the processing resources 11, 41 may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on a multi core processor architecture, as non-limiting examples.
  • circuitry refers to all of the following:
  • circuits such as a microprocessor (s) or a portion of a microprocessor (s) , that require software or firmware for operation, even if the software or firmware is not physically present.
  • ′′circuitry′′ applies to all uses of this term in this application, including in any claims.
  • the term ′′circuitry′′ would also cover an implementation of merely a processor (or multiple processors) or portion of a processor and its (or their) accompanying software and/or firmware.
  • the term ′′circuitry′′ would also cover, for example and if applicable to the particular claim element, a baseband integrated circuit or applications processor integrated circuit for a mobile phone or a similar integrated circuit in server, a cellular network device, or other network device.
  • an apparatus of a cellular communications network system comprises a UE.
  • the apparatus may comprise the control unit 10 shown in Fig. 3 and/or execute the process shown in Fig. 1.
  • the apparatus comprises monitoring means for monitoring a serving cell of a radio access network of the cellular communications network system, wherein the serving cell provides access for the apparatus to the cellular communications network system, and for monitoring neighboring cells of the radio access network, which are in the vicinity of the serving cell, wherein the monitoring of the neighboring cells is performed with a first predetermined time interval and the monitoring of the serving cell is performed with a second predetermined time interval, measuring means for measuring change of a received power of a reference signal from the serving cell within the second predetermined time interval, acquiring means for acquiring a defined threshold associated with the second predetermined time interval, comparing means for comparing the measured change with the defined threshold associated with the second predetermined time interval, and deciding means for deciding whether to alter the first predetermined time interval based on a result of the comparing.
  • the apparatus comprises extending means for extending the first predetermined time interval in case the comparing provides the result that the measured change is below the defined threshold.
  • the monitoring means track change of a list of the neighboring cells, and the deciding means decides whether to alter the first predetermined time interval based on the result of the comparing and based on whether there is a change of the list.
  • the extending means extends the first predetermined time interval in case the comparing provides the result that the measured change is below the defined threshold and there is no change of the list.
  • the measuring means measures change of a received power of a reference signal from each of the neighboring cells within the first predetermined time interval
  • the acquiring means acquires a defined threshold associated with the first predetermined time interval
  • the comparing means compares the measured change of the received power of the reference signal from each of the neighboring cells with the defined threshold associated with the first predetermined time interval
  • the deciding means decides whether to alter the first predetermined time interval based on a result of the comparing for the serving cell and each of the neighboring cells.
  • the extending means extends the first predetermined time interval in case the comparing provides the result that the measured change is below the defined thresholds for the serving cell and each of the neighboring cells.
  • the acquiring means acquires the defined threshold associated with the second predetermined time interval from a table which defines a respective threshold for each of a plurality of time intervals for the measuring.
  • the acquiring means acquires the defined threshold associated with the first predetermined time interval from a table which defines a respective threshold for each of a plurality of time intervals for the measuring.
  • the plurality of time intervals defined in the table comprises single interval values or interval value ranges.
  • the acquiring means acquires the respective threshold defined for one of the single interval values, which is the largest one equal to or smaller than the second predetermined time interval, as the defined threshold associated with the second predetermined time interval.
  • the acquiring means acquires the respective threshold defined for one of the interval value ranges, which comprises the second predetermined time interval, as the defined threshold associated with the second predetermined time interval.
  • the acquiring means acquires the respective threshold defined for one of the interval value ranges, which comprises the first predetermined time interval, as the defined threshold associated with the first predetermined time interval.
  • the acquiring means acquires the defined threshold associated with the second predetermined time interval from a rule calculating the defined threshold from the second predetermined time interval.
  • the acquiring means acquires the defined threshold associated with the first predetermined time interval from a rule calculating the defined threshold from the first predetermined time interval.
  • the defined threshold associated with the second predetermined time interval is defined for each of a normal coverage mode and a coverage enhancement mode.
  • the defined threshold associated with the first predetermined time interval is defined for each of a normal coverage mode and a coverage enhancement mode.
  • the defined threshold associated with the second predetermined time interval is defined for each coverage enhancement level.
  • the monitoring means, the measuring means, the acquiring means, the comparing means, the deciding means, the extending means and the receiving means are implemented by the processing resources (processing circuitry) 11, the memory resources (memory circuitry) 12 and the interfaces (interface circuitry) 13 of the control unit 10.
  • an apparatus of a cellular communications network system comprises an apparatus on the network side.
  • the apparatus may comprise the control unit 40 shown in Fig. 3 and/or execute the process shown in Fig. 2.
  • the apparatus comprises configuring means for configuring a defined threshold associated with a second predetermined time interval for measuring change of a received power of a reference signal from a serving cell of a radio access network of a cellular communications network system, wherein the serving cell provides access for a user equipment to the cellular communications network system, wherein the defined threshold is compared with the change, and a first predetermined time interval for monitoring neighboring ceils of the radio access network, which are in the vicinity of the serving cell, is altered based on a result of the comparing, and providing means for providing the defined threshold via a broadcasting message.
  • the configuring means and the providing means are implemented by the processing resources (processing circuitry) 41, the memory resources (memory circuitry) 42 and the interfaces (interface circuitry) 43 of the control unit 40.

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Abstract

A UE of a cellular communications network system monitors (S21) a serving cell of a radio access network of the cellular communications network system, wherein the serving cell provides access for the user equipment to the cellular communications network system, and monitors (S21) neighboring cells of the radio access network, which are in the vicinity of the serving cell. The UE measures (S22) change of a received power of a reference signal from the serving cell within a second predetermined time interval for monitoring the serving cell, acquires (S23) a defined threshold associated with the second predetermined time interval, compares (S24) the measured change with the defined threshold associated with the second predetermined time interval, and decides (S25) whether to alter a first predetermined time interval for monitoring the neighboring cells based on a result of the comparing.

Description

NEIGHBOR MONITORING IN CELLULAR COMMUNICATIONS NETWORK SYSTEMS DESCRIPTION BACKGROUND OF THE INVENTION Field of the invention
The present invention relates to neighbor monitoring in cellular communications network systems. For example, the present invention can be applied in 3GPP systems utilizing eMTC and NB-IoT.
Related background Art
To achieve further UE power saving in eMTC and NB-IoT, relaxed monitoring for cell (re-) selection can be enabled e.g. by (re-) configuration of the UE.
The following meanings for the abbreviations used in this specification apply:
3GPP  Third Generation Partnership Project
CE    Coverage Enhancement
eMTC  enhanced Machine Type Communication
eNB   eNodeB
IoT   Internet of Things
NB    NarrowBand
RSRP  Reference Signal Received Power
SIB   System Information Block
UE    User Equipment
SUMMARY OF THE INVENTION
At least one embodiment of the present invention aims at optimizing UE power consumption.
This is achieved by the methods, apparatuses and non-transitory storage medium as defined in the appended claims.
In the following the invention will be described by way of embodiments thereof with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 shows a flowchart illustrating a neighbor monitoring process according to at least some embodiments of the invention.
Fig. 2 shows a flowchart illustrating a threshold provision process according to at least some embodiments of the invention.
Fig. 3 shows a schematic block diagram illustrating a configuration of control units in which examples of embodiments of the invention are implementable.
DESCRIPTION OF THE EMBODIMENTS
At least some embodiments of the invention are applicable to a UE of a cellular communications network system. In idle mode, for example, the UE monitors a serving cell of a radio access network of the cellular communications network system, wherein the serving cell provides access for the user equipment to the cellular communications network system. The UE also monitors neighboring cells of the radio access network, which are in the vicinity of the serving cell. The monitoring is performed with a predetermined time interval, which may be same or different for serving cell and neighboring cell (s) .
According to a working assumption for relaxed monitoring for cell (re-) selection, the UE dynamically determines whether to apply relaxed monitoring by change in serving cell RSRP.
For example, configuration parameters for the dynamic determination whether to apply relaxed monitoring can be provided to the UE by means of system information.
Known functionality of ″Sintrasearch″ and ″Sinterseach″ is adoptable, and relaxed monitoring is applicable when the UE is below Sintrasearch or Sintersearch thresholds respectively, if configured.
UEs that apply relaxed monitoring need to perform neighbor cell measurements on a slow time scale, regardless if the UE considers itself to be stationary. An intention is that this shall not make it worse for any case with respect to power consumption.
The mechanism based on serving cell RSRP change works well for stationary UEs, however, it has the following problems:
1) Inaccurate stationary detection. For example, when the UE moves in a circle around an eNB, its serving cell′s RSRP may remain the same or change very slightly, while the UE may declare itself as stationary based on change of serving cell′s RSRP and relax neighbor cell monitoring, although it is actually a moving UE. This may result in losing a chance for potential cell reselection due to relaxed monitoring.
2) It is meaningless to evaluate UE′s mobility based solely on serving cell′s RSRP change, without having the time frame defined for this evaluation. For example, an RSRP change by 1dB may have a completely different meaning for the time interval of 1s and one day.
3) It is not clear how to set the RSRP change threshold. Different CE levels may have different measurement requirements, e.g. for CE mode A and CE mode B, the measurement requirements and measurement accuracy are different. The same RSRP change in CE mode A and CE mode  B may mean different UE speed, so a common threshold may not be appropriate.
At least some embodiments of the invention provide further enhancement for relaxed neighbor monitoring based on RSRP change.
Fig. 1 shows a flowchart illustrating a process of neighbor monitoring according to at least some embodiments of the invention.
In S21, a UE of a cellular communications network system monitors a serving cell of a radio access network of the cellular communications network system, wherein the serving cell provides access for the user equipment to the cellular communications network system, and monitors neighboring cells of the radio access network, which are in the vicinity of the serving cell. The monitoring of the neighboring cells is performed with a first predetermined time interval.
According to an implementation example of the invention, the first predetermined time interval is a number N of paging cycles of the UE, where N may be 1, 2, 3 or a larger integer number depending on the paging cycle.
In S22, the UE measures a change of a received power of a reference signal from the serving cell, i.e. the serving cell′s RSRP change, within a second predetermined time interval. According to at least one embodiment of the invention, the UE acquires the second predetermined time interval from network configuration.
Alternatively, according to at least one embodiment of the invention, the second predetermined time interval is inherent to the UE. The second predetermined time interval may vary within the UE. The second predetermined time internal that UE uses to take two RSRP results should not be taken beyond what the network configuration allows. For example, if  the time interval in the network configured ″time interval -RSRP change threshold″ refers to an interval value range, then the second predetermined time interval that UE uses to take two RSRP results should only be taken from union of the signaled interval value ranges.
In S23, the UE acquires a defined threshold associated with the second predetermined time interval.
In S24, the UE compares the measured change with the defined threshold associated with the second predetermined time interval.
In S25, the UE decides whether to alter the first predetermined time interval based on a result of the comparing.
For example, in case the comparing in S24 provides the result that the measured change is below the defined threshold, in S25 the UE may decide to alter the first predetermined time interval, e.g. perform the relaxed neighbor monitoring.
According to at least one embodiment of the invention, the UE acquires the defined threshold from a table.
According to an implementation example of the invention, a ″time interval -RSRP change threshold″ table is signaled to the UE via broadcasting from the radio access network. For example, the time interval is a single interval value or an interval value range like [lower interval, higher interval] . The UE compares two RSRP results with the corresponding RSRP change threshold in the table to evaluate whether it is ″stationary″ enough to relax neighbor monitoring or ″mobile″ enough to return from the relaxed neighbor monitoring to normal neighbor monitoring.
For the option of the single interval value, the two RSRP results taken for the comparison should be separated by at least this value.
For the option of the interval value range, the interval between two RSRP results taken for the comparison should fall into this range.
According to an implementation example of the invention, the table defines a respective threshold for each of a plurality of time intervals for the measuring. In case the single interval values are defined in the table, the UE acquires, as the defined threshold associated with the second predetermined time interval, the respective threshold defined for one of the single interval values, which is the largest one equal to or smaller than the second predetermined time interval. In case the interval value ranges are defined in the table, the UE acquires, as the defined threshold associated with the second predetermined time interval, the respective threshold defined for one of the interval value ranges, which comprises the second predetermined time interval.
Alternatively, according to at least one embodiment of the invention, the UE calculates the defined threshold associated with the second predetermined time interval from a rule calculating the defined threshold from the second predetermined time interval of the UE. For example, the UE receives the rule via a broadcasting message from the radio access network.
Fig. 2 shows a flowchart illustrating a threshold provisioning process according to at least some embodiments of the invention.
In step S31, the defined threshold associated with the second predetermined time interval is configured and, in step S32, the defined threshold is provided via a broadcasting message.
For example, the above process is performed by an apparatus of the cellular communications network system.
According to at least one embodiment of the invention, different ″time interval -RSRP change threshold″ tables or rules are configured for  different CE levels, to take each CE level′s measurement requirement into account.
Alternatively or in addition, according to at least one embodiment of the invention, two tables or rules are configured, one for normal coverage and the other for enhanced coverage.
Alternatively or in addition, according to at least one embodiment of the invention, two tables or rules are configured, one for CE mode A coverage and the other for CE mode B coverage.
According to at least one embodiment of the invention, in addition to evaluating the serving cell′s RSRP change, the UE also tracks the change of its neighbor cell list to decide whether to alter the first predetermined time interval. For example, the UE performs relaxed neighbor monitoring based on the above-described serving cell′s RSRP check and no change of the neighbor cell list.
In other words, in the monitoring, the UE tracks change of a list of the neighboring cells, and decides whether to alter the first predetermined time interval based on the result of the comparing and based on whether there is a change of the list. For example, in case the comparing provides the result that the measured change is below the defined threshold associated with the second predetermined time interval and there is no change of the list, the UE may extend the first predetermined time interval, e.g. perform the relaxed neighbor monitoring.
Alternatively, according to at least one embodiment of the invention, the UE applies the ″time interval -RSRP change threshold″ table or rule also to the neighbor cells in the list.
In other words, the UE also measures change of a received power of a reference signal from each of the neighboring cells within the first  predetermined time interval, acquires a defined threshold associated with the first predetermined time interval, and compares the measured change of the received power of the reference signal from each of the neighboring cells with the defined threshold associated with the first predetermined time interval. Then, the UE decides whether to alter the first predetermined time interval based on a result of the comparing for the serving cell and each of the neighboring cells.
For example, the defined threshold associated with the first predetermined time interval is acquired from the table defining the respective threshold for each of the plurality of time intervals for the measuring similar as described above with respect to the defined threshold associated with the second predetermined time interval. The first predetermined time interval that UE uses to take two RSRP results should not be taken beyond what the network configuration allows. For example, if the time interval in the network configured ″time interval -RSRP change threshold″ refers to an interval value range, then the first predetermined time interval that UE uses to take two RSRP results should only be taken from union of the signaled interval value ranges.
For example, in case the comparing provides the result that the measured change is below the defined threshold for the serving cell and each of the neighboring cells, the UE may extend the first predetermined time interval, e.g. perform the relaxed neighbor monitoring.
Referring to Fig. 2, according to at least one embodiment of the invention, in step S31, the defined threshold associated with the first predetermined time interval is configured in addition to or instead of the defined threshold associated with the second predetermined time interval, and, in step S32, the defined threshold associated with the first predetermined time interval is provided via a broadcasting message together with or separate from the defined threshold associated with the second predetermined time interval.
Measurement requirements of a UE in idle mode are defined in such a way that the UE should at least measure (monitor) the serving and neighbor cells every [N] paging cycles, where N can be 1, 2, 3 or a larger integer number depending on the paging cycle. On the other hand, the UE is fully allowed to measure RSRP more frequently. So how often an RSRP result is generated at layer L1 of the UE is up to UE implementation, and it can be every 160ms for some UEs or every 40min for some other UEs (it can vary even with the same UE) . The same change in RSRP like 1dB means different mobility level for 160ms and 40min. In order for the network side of the cellular communications network system to control a switch between normal and relaxed neighbor monitoring modes consistently for all UEs, it is necessary to align the frequency at which RSRP results are generated and taken for the comparison.
According to an implementation example of the invention, in order to align the frequency at which RSRP results are generated and taken for the comparison, the network side indicates a preferred RSRP measurement interval and corresponding threshold (defined threshold) as shown in Table I below.
Table I
RSRP Measurement Interval Threshold
2.56s 3dB
According to an alternative implementation example of the invention, a rule for scaling the threshold (defined threshold) with a measurement interval of the UE can be defined, e.g. Threshold = 3 + 10log (X /2.56s) , where X is the actual RSRP measurement time used by the UE.
As described above, according to at least some embodiments of the invention, the threshold (defined threshold) should be different for normal and enhanced coverage modes. As the RSRP measurement error is large in the enhanced coverage mode, the threshold to trigger the switch should be also larger, otherwise the UE may wrongly determine it is in ″mobile″ state  just due to the measurement error. This means the threshold should be separately configured for different CE level.
Further, as described above, according to at least some embodiments of the invention, the network side requires the UE to take neighbor cell measurement results into account when determining if it is ″stationary″ .
Now reference is made to Fig. 3 illustrating a configuration of  control units  10 and 40 in which examples of embodiments of the invention are implementable. According to an implementation example of the invention, the control unit 10 is part of and/or is used by a UE of a cellular communications network system. For example, the control unit 10 executes the process shown in Fig. 1. According to an implementation example of the invention, the control unit 40 is part of and/or is used by an apparatus of a cellular communications network system. For example, the control unit 40 executes the process shown in Fig. 2.
The control unit 10 comprises processing resources (processing circuitry) 11, memory resources (memory circuitry) 12 storing a program, and interfaces (interface circuitry) 13, which are coupled via a connection 14. The interfaces 13 may comprise a suitable radio frequency (RF) transceiver (not shown) coupled to one or more antennas (not shown) for wireless communications over a connection 50 with the control unit 40 and for wireless communications over one or more wireless links with neighboring cells.
The control unit 40 comprises processing resources (processing circuitry) 41, memory resources (memory circuitry) 42 storing a program, and interfaces (interface circuitry) 43, which are coupled via a connection 44. The interfaces 43 may comprise a suitable radio frequency (RF) transceiver (not shown) coupled to one or more antennas (not shown) for wireless communications over the connection 50 with the control unit 40.
The terms ″connected, ″ ″coupled, ″ or any variant thereof, mean any connection or coupling, either direct or indirect, between two or more elements, and may encompass the presence of one or more intermediate elements between two elements that are ″connected″ or ″coupled″ together. The coupling or connection between the elements can be physical, logical, or a combination thereof. As employed herein two elements may be considered to be ″connected″ or ″coupled″ together by the use of one or more wires, cables and printed electrical connections, as well as by the use of electromagnetic energy, such as electromagnetic energy having wavelengths in the radio frequency region, the microwave region and the optical (both visible and invisible) region, as non-limiting examples.
At least one of the programs stored in the  memory resources  12, 42 is assumed to include program instructions that, when executed by the associated processing resources, enable the electronic device to operate in accordance with the exemplary embodiments of this invention, as detailed above.
In general, the exemplary embodiments of this invention may be implemented by computer software stored in the memory resources 12 and executable by the processing resources 11 of the control unit 10 and similar for the other memory resources 42 and processing resources 41 of the control unit 40, or by hardware, or by a combination of software and/or firmware and hardware in any or all of the devices shown.
In general, various embodiments of the UE can include, but are not limited to, mobile stations, cellular telephones, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and playback appliances having wireless communication capabilities, Internet appliances permitting  wireless Internet access and browsing, as well as portable units or terminals that incorporate combinations of such functions.
The  memory resources  12, 42 may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory. The  processing resources  11, 41 may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on a multi core processor architecture, as non-limiting examples.
Further, as used in this application, the term ″circuitry″ refers to all of the following:
(a) hardware-only circuit implementations (such as implementations in only analog and/or digital circuitry) and
(b) to combinations of circuits and software (and/or firmware) , such as (as applicable) : (i) to a combination of processor (s) or (ii) to portions of processor (s) /software (including digital signal processor (s) ) , software, and memory (ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and
(c) to circuits, such as a microprocessor (s) or a portion of a microprocessor (s) , that require software or firmware for operation, even if the software or firmware is not physically present.
This definition of ″circuitry″ applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term ″circuitry″ would also cover an implementation of merely a processor (or multiple processors) or portion of a processor and its (or their) accompanying software and/or firmware. The term ″circuitry″ would also cover, for example and if applicable to the particular claim element, a  baseband integrated circuit or applications processor integrated circuit for a mobile phone or a similar integrated circuit in server, a cellular network device, or other network device.
According to an aspect of the present invention, an apparatus of a cellular communications network system is provided. According to at least one embodiment of the invention, the apparatus comprises a UE. According to an implementation example of the invention, the apparatus may comprise the control unit 10 shown in Fig. 3 and/or execute the process shown in Fig. 1.
The apparatus according to the above aspect of the invention comprises monitoring means for monitoring a serving cell of a radio access network of the cellular communications network system, wherein the serving cell provides access for the apparatus to the cellular communications network system, and for monitoring neighboring cells of the radio access network, which are in the vicinity of the serving cell, wherein the monitoring of the neighboring cells is performed with a first predetermined time interval and the monitoring of the serving cell is performed with a second predetermined time interval, measuring means for measuring change of a received power of a reference signal from the serving cell within the second predetermined time interval, acquiring means for acquiring a defined threshold associated with the second predetermined time interval, comparing means for comparing the measured change with the defined threshold associated with the second predetermined time interval, and deciding means for deciding whether to alter the first predetermined time interval based on a result of the comparing.
According to at least one embodiment of the invention, the apparatus comprises extending means for extending the first predetermined time interval in case the comparing provides the result that the measured change is below the defined threshold.
According to at least one embodiment of the invention, the monitoring means track change of a list of the neighboring cells, and the deciding means decides whether to alter the first predetermined time interval based on the result of the comparing and based on whether there is a change of the list.
According to at least one embodiment of the invention, the extending means extends the first predetermined time interval in case the comparing provides the result that the measured change is below the defined threshold and there is no change of the list.
According to at least one embodiment of the invention, the measuring means measures change of a received power of a reference signal from each of the neighboring cells within the first predetermined time interval, the acquiring means acquires a defined threshold associated with the first predetermined time interval, the comparing means compares the measured change of the received power of the reference signal from each of the neighboring cells with the defined threshold associated with the first predetermined time interval, and the deciding means decides whether to alter the first predetermined time interval based on a result of the comparing for the serving cell and each of the neighboring cells.
According to at least one embodiment of the invention, the extending means extends the first predetermined time interval in case the comparing provides the result that the measured change is below the defined thresholds for the serving cell and each of the neighboring cells.
According to at least one embodiment of the invention, the acquiring means acquires the defined threshold associated with the second predetermined time interval from a table which defines a respective threshold for each of a plurality of time intervals for the measuring.
Alternatively or in addition, according to at least one embodiment of the invention, the acquiring means acquires the defined threshold associated with the first predetermined time interval from a table which defines a respective threshold for each of a plurality of time intervals for the measuring.
According to at least one embodiment of the invention, the plurality of time intervals defined in the table comprises single interval values or interval value ranges.
According to at least one embodiment of the invention, in case the single interval values are defined in the table, the acquiring means acquires the respective threshold defined for one of the single interval values, which is the largest one equal to or smaller than the second predetermined time interval, as the defined threshold associated with the second predetermined time interval.
Alternatively or in addition, according to at least one embodiment of the invention, in case the single interval values are defined in the table, the acquiring means acquires the respective threshold defined for one of the single interval values, which is the largest one equal to or smaller than the first predetermined time interval, as the defined threshold associated with the first predetermined time interval.
Alternatively or in addition, according to at least one embodiment of the invention, in case the interval value ranges are defined in the table, the acquiring means acquires the respective threshold defined for one of the interval value ranges, which comprises the second predetermined time interval, as the defined threshold associated with the second predetermined time interval.
Alternatively or in addition, according to at least one embodiment of the invention, in case the interval value ranges are defined in the table, the  acquiring means acquires the respective threshold defined for one of the interval value ranges, which comprises the first predetermined time interval, as the defined threshold associated with the first predetermined time interval.
According to at least one embodiment of the invention, the acquiring means acquires the defined threshold associated with the second predetermined time interval from a rule calculating the defined threshold from the second predetermined time interval.
Alternatively or in addition, according to at least one embodiment of the invention, the acquiring means acquires the defined threshold associated with the first predetermined time interval from a rule calculating the defined threshold from the first predetermined time interval.
According to at least one embodiment of the invention, the defined threshold associated with the second predetermined time interval is defined for each of a normal coverage mode and a coverage enhancement mode.
Alternatively or in addition, according to at least one embodiment of the invention, the defined threshold associated with the first predetermined time interval is defined for each of a normal coverage mode and a coverage enhancement mode.
According to at least one embodiment of the invention, the defined threshold associated with the second predetermined time interval is defined for each coverage enhancement level.
Alternatively or in addition, according to at least one embodiment of the invention, the defined threshold associated with the first predetermined time interval is defined for each coverage enhancement level.
According to at least one embodiment of the invention, the apparatus comprises receiving means for receiving the defined threshold associated with the second predetermined time interval and/or the defined threshold associated with the first predetermined time interval via a broadcasting message from the radio access network.
According to at least one embodiment of the invention, the monitoring means, the measuring means, the acquiring means, the comparing means, the deciding means, the extending means and the receiving means are implemented by the processing resources (processing circuitry) 11, the memory resources (memory circuitry) 12 and the interfaces (interface circuitry) 13 of the control unit 10.
According to another aspect of the present invention, an apparatus of a cellular communications network system is provided. According to at least one embodiment of the invention, the apparatus comprises an apparatus on the network side. According to an implementation example of the invention, the apparatus may comprise the control unit 40 shown in Fig. 3 and/or execute the process shown in Fig. 2.
The apparatus according to the above aspect of the invention comprises configuring means for configuring a defined threshold associated with a second predetermined time interval for measuring change of a received power of a reference signal from a serving cell of a radio access network of a cellular communications network system, wherein the serving cell provides access for a user equipment to the cellular communications network system, wherein the defined threshold is compared with the change, and a first predetermined time interval for monitoring neighboring ceils of the radio access network, which are in the vicinity of the serving cell, is altered based on a result of the comparing, and providing means for providing the defined threshold via a broadcasting message.
According to at least one embodiment of the invention, the configuring means and the providing means are implemented by the processing resources (processing circuitry) 41, the memory resources (memory circuitry) 42 and the interfaces (interface circuitry) 43 of the control unit 40.
It is to be understood that the above description is illustrative of the invention and is not to be construed as limiting the invention. Various modifications and applications may occur to those skilled in the art without departing from the true spirit and scope of the invention as defined by the appended claims.

Claims (25)

  1. A method for use by a user equipment of a cellular communications network system, the method comprising:
    monitoring a serving cell of a radio access network of the cellular communications network system, wherein the serving cell provides access for the user equipment to the cellular communications network system, and monitoring neighboring cells of the radio access network, which are in the vicinity of the serving cell, wherein the monitoring of the neighboring cells is performed with a first predetermined time interval and the monitoring of the serving cell is performed with a second predetermined time interval;
    measuring change of a received power of a reference signal from the serving cell within the second predetermined time interval;
    acquiring a defined threshold associated with the second predetermined time interval;
    comparing the measured change with the defined threshold associated with the second predetermined time interval; and
    deciding whether to alter the first predetermined time interval based on a result of the comparing.
  2. The method of claim 1, comprising:
    extending the first predetermined time interval in case the comparing provides the result that the measured change is below the defined threshold.
  3. The method of claim 1, comprising:
    in the monitoring, tracking change of a list of the neighboring cells; and
    deciding whether to alter the first predetermined time interval based on the result of the comparing and based on whether there is a change of the list.
  4. The method of claim 3, comprising:
    extending the first predetermined time interval in case the comparing provides the result that the measured change is below the defined threshold and there is no change of the list.
  5. The method of claim 1, comprising:
    measuring change of a received power of a reference signal from each of the neighboring cells within the first predetermined time interval;
    acquiring a defined threshold associated with the first predetermined time interval;
    comparing the measured change of the received power of the reference signal from each of the neighboring cells with the defined threshold associated with the first predetermined time interval; and
    deciding whether to alter the first predetermined time interval based on a result of the comparing for the serving cell and each of the neighboring cells.
  6. The method of claim 5, comprising:
    extending the first predetermined time interval in case the comparing provides the result that the measured change is below the defined thresholds for the serving cell and each of the neighboring cells.
  7. The method of any one of claims 1 to 6, the acquiring comprising:
    acquiring the defined threshold associated with the second predetermined time interval from a table which defines a respective threshold for each of a plurality of time intervals for the measuring; and/or
    acquiring the defined threshold associated with the first predetermined time interval from a table which defines a respective threshold for each of a plurality of time intervals for the measuring.
  8. The method of claim 7,
    wherein the plurality of time intervals defined in the table comprises single interval values or interval value ranges,
    wherein, in case the single interval values are defined in the table,
    in the acquiring, the respective threshold defined for one of the single interval values, which is the largest one equal to or smaller than the second predetermined time interval, is used as the defined threshold associated with the second predetermined time interval, and/or
    in the acquiring, the respective threshold defined for one of the single interval values, which is the largest one equal to or smaller than the first predetermined time interval, is used as the defined threshold associated with the first predetermined time interval, and
    wherein, in case the interval value ranges are defined in the table,
    in the acquiring, the respective threshold defined for one of the interval value ranges, which comprises the second predetermined time interval, is used as the defined threshold associated with the second predetermined time interval, and/or
    in the acquiring, the respective threshold defined for one of the interval value ranges, which comprises the first predetermined time interval, is used as the defined threshold associated with the first predetermined time interval.
  9. The method of any one of claims 1 to 6, comprising:
    acquiring the defined threshold associated with the second predetermined time interval from a rule calculating the defined threshold from the second predetermined time interval, and/or
    acquiring the defined threshold associated with the first predetermined time interval from a rule calculating the defined threshold from the first predetermined time interval.
  10. The method of any one of claims 1 to 9, wherein
    the defined threshold associated with the second predetermined time interval is defined for each of a normal coverage mode and a coverage enhancement mode, and/or
    the defined threshold associated with the first predetermined time interval is defined for each of a normal coverage mode and a coverage enhancement mode.
  11. The method of any one of claims 1 to 10, wherein
    the defined threshold associated with the second predetermined time interval is defined for each coverage enhancement level, and/or
    the defined threshold associated with the first predetermined time interval is defined for each coverage enhancement level.
  12. The method of any one of claims 1 to 11, comprising:
    receiving the defined threshold associated with the second predetermined time interval and/or the defined threshold associated with the first predetermined time interval via a broadcasting message from the radio access network.
  13. A method comprising:
    configuring a defined threshold associated with a second predetermined time interval for measuring change of a received power of a reference signal from a serving cell of a radio access network of a cellular communications network system, wherein the serving cell provides access for a user equipment to the cellular communications network system, wherein the defined threshold is compared with the change, and a first predetermined time interval for monitoring neighboring cells of the radio access network, which are in the vicinity of the serving cell, is altered based on a result of the comparing; and
    providing the defined threshold via a broadcasting message.
  14. A non-transitory storage medium storing a program for a computer, comprising software code portions for performing the steps of any one of claims 1 to 13 when the program is run on the computer.
  15. An apparatus of a cellular communications network system, the apparatus comprising at least one processor and at least one memory including computer program code, the at least one memory and the  computer program code configured to, with the at least one processor, cause the apparatus at least to perform:
    monitoring a serving cell of a radio access network of the cellular communications network system, wherein the serving cell provides access for the apparatus to the cellular communications network system, and monitoring neighboring cells of the radio access network, which are in the vicinity of the serving cell, wherein the monitoring of the neighboring cells is performed with a first predetermined time interval and the monitoring of the serving cell is performed with a second predetermined time interval;
    measuring change of a received power of a reference signal from the serving cell within the second predetermined time interval;
    acquiring a defined threshold associated with the second predetermined time interval;
    comparing the measured change with the defined threshold associated with the second predetermined time interval; and
    deciding whether to alter the first predetermined time interval based on a result of the comparing.
  16. The apparatus of claim 15, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to further perform:
    extending the first predetermined time interval in case the comparing provides the result that the measured change is below the defined threshold.
  17. The apparatus of claim 15, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to perform:
    in the monitoring, tracking change of a list of the neighboring cells; and
    deciding whether to alter the first predetermined time interval based on the result of the comparing and based on whether there is a change of the list.
  18. The apparatus of claim 17, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to further perform:
    extending the first predetermined time interval in case the comparing provides the result that the measured change is below the defined threshold and there is no change of the list.
  19. The apparatus of claim 15, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to further perform:
    measuring change of a received power of a reference signal from each of the neighboring cells within the first predetermined time interval;
    acquiring a defined threshold associated with the first predetermined time interval;
    comparing the measured change of the received power of the reference signal from each of the neighboring cells with the defined threshold associated with the first predetermined time interval; and
    deciding whether to alter the first predetermined time interval based on a result of the comparing for the serving cell and each of the neighboring cells.
  20. The apparatus of claim 19, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to further perform:
    extending the first predetermined time interval in case the comparing provides the result that the measured change is below the defined thresholds for the serving cell and each of the neighboring cells.
  21. The apparatus of any one of claims 15 to 20, the acquiring comprising:
    acquiring the defined threshold associated with the second predetermined time interval from a table which defines a respective threshold for each of a plurality of time intervals for the measuring; and/or
    acquiring the defined threshold associated with the first predetermined time interval from a table which defines a respective threshold for each of a plurality of time intervals for the measuring.
  22. The apparatus of claim 21,
    wherein the plurality of time intervals defined in the table comprises single interval values or interval value ranges,
    wherein, in case the single interval values are defined in the table,
    in the acquiring, the respective threshold defined for one of the single interval values, which is the largest one equal to or smaller than the second predetermined time interval, is used as the defined threshold associated with the second predetermined time interval, and/or
    in the acquiring, the respective threshold defined for one of the single interval values, which is the largest one equal to or smaller than the first predetermined time interval, is used as the defined threshold associated with the first predetermined time interval, and
    wherein, in case the interval value ranges are defined in the table,
    in the acquiring, the respective threshold defined for one of the interval value ranges, which comprises the second predetermined time interval, is used as the defined threshold associated with the second predetermined time interval, and/or
    in the acquiring, the respective threshold defined for one of the interval value ranges, which comprises the first predetermined time interval, is used as the defined threshold associated with the first predetermined time interval.
  23. The apparatus of any one of claims 15 to 20, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to further perform:
    acquiring the defined threshold associated with the second predetermined time interval from a rule calculating the defined threshold from the second predetermined time interval, and/or
    acquiring the defined threshold associated with the first predetermined time interval from a rule calculating the defined threshold from the first predetermined time interval.
  24. The apparatus of any one of claims 15 to 23, comprising:
    receiving the defined threshold associated with the second predetermined time interval and/or the defined threshold associated with the first predetermined time interval via a broadcasting message from the radio access network.
  25. An apparatus of a cellular communications network system, the apparatus comprising at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform:
    configuring a defined threshold associated with a second predetermined time interval for measuring change of a received power of a reference signal from a serving cell of a radio access network of a cellular communications network system, wherein the serving cell provides access for a user equipment to the cellular communications network system, wherein the defined threshold is compared with the change, and a first predetermined time interval for monitoring neighboring cells of the radio access network, which are in the vicinity of the serving cell, is altered based on a result of the comparing; and
    providing the defined threshold via a broadcasting message.
PCT/CN2017/111343 2017-11-16 2017-11-16 Neighbor monitoring in cellular communications network systems WO2019095198A1 (en)

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