WO2011120571A1 - Arrêt de minimisation de la journalisation de mesure d'essais de commande - Google Patents

Arrêt de minimisation de la journalisation de mesure d'essais de commande Download PDF

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Publication number
WO2011120571A1
WO2011120571A1 PCT/EP2010/054294 EP2010054294W WO2011120571A1 WO 2011120571 A1 WO2011120571 A1 WO 2011120571A1 EP 2010054294 W EP2010054294 W EP 2010054294W WO 2011120571 A1 WO2011120571 A1 WO 2011120571A1
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WIPO (PCT)
Prior art keywords
network
logging
change
system information
measurement
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Application number
PCT/EP2010/054294
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English (en)
Inventor
Malgorzata Tomala
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Nokia Siemens Networks Oy
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Application filed by Nokia Siemens Networks Oy filed Critical Nokia Siemens Networks Oy
Priority to PCT/EP2010/054294 priority Critical patent/WO2011120571A1/fr
Publication of WO2011120571A1 publication Critical patent/WO2011120571A1/fr

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Classifications

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

Definitions

  • the present invention relates to an apparatus, a method, a system, and a computer program product related to minimizing drive test measurements. More particularly, the present in ⁇ vention relates to an apparatus, a method, a system, and a computer program product for stopping minimize drive test (MDT) measurement logging.
  • MDT minimize drive test
  • MDT Minimizing drive tests
  • LTE long term evolution
  • 3GPP 3 rd generation partnership project
  • RAN radio access networks
  • WG2 radio access networks
  • the activity aims to define automatic collection of measurements performed by a user equipment (UE) , to enable easier monitoring of network performance and consequently to replace expensive drive-tests performed by operators dedicatedly. Since the functionality requires relevant input from the terminal, i.e. the user equipment, an involvement of the UEs is evident.
  • the MDT feature considers re-usage of the existing measure ⁇ ments defined for typical mobility control and corresponding real-time reporting mode.
  • the available means have been recognized as not sufficient to detect some network is- sues identified for e.g. coverage optimization, which is the prioritized MDT use case.
  • idle mode mobility parameter settings and information about radio coverage when UE is idle are not possible to discover, whereas they are crucial for network dimensioning and planning.
  • the MDT has considered logging measurements and non-real time reporting mechanism and brought them into the LTE standard.
  • an apparatus comprising measuring means configured to perform a measurement of a radio parameter entity of a net ⁇ work; logging means configured to log the measurement; moni- toring means configured to monitor a change of validity state of a system information of a radio resource control; and stopping means configured to stop the logging of the measure ⁇ ment based on the change of the validity state of the system information monitored by the monitoring means.
  • the change of the validity state may be at least one of a change of the system information and an expiry of a maximum validity period of the system information.
  • the apparatus may further com ⁇ prise first network monitoring means configured to monitor a first status of the network; and first number setting means configured to set a first defined number based on the first status, wherein the stopping means may be configured to stop the logging if the change of the validity state has occurred the first defined number of times.
  • the apparatus may further com- prise second number setting means configured to set a second defined number based on a setting information received from the network, wherein the stopping means may be configured to stop the logging if the change of the validity state has oc ⁇ curred the second defined number of times.
  • the radio pa ⁇ rameter entity may comprise at least one of a common pilot channel received signal code power, a reference signal re- ceived power, a reference signal received quality, a location information, a time information, and a cell identification.
  • the apparatus according to the first aspect may further com- prise enabling means configured to enable a transmitting of the logged measurements when the apparatus is in a connected mode, in which at least one of radio resources, mobility, and a handover of the apparatus are controlled by the network.
  • the stopping means may be configured to stop the logging only if the change of the validity state is caused by a change of a pre ⁇ defined parameter contained in the system information, or if the maximum validity period of the system information is ex- pired.
  • an apparatus comprising measuring processor configured to perform a measurement of a radio parameter entity of a network; logging processor configured to log the measurement; monitoring processor configured to monitor a change of valid ⁇ ity state of a system information of a radio resource con ⁇ trol; and stopping processor configured to stop the logging of the measurement based on the change of the validity state of the system information monitored by the monitoring proces ⁇ sor .
  • the change of the validity state may be at least one of a change of the system information and an expiry of a maximum validity period of the system information.
  • the apparatus may further com ⁇ prise first network monitoring processor configured to moni- tor a first status of the network; and first number setting processor configured to set a first defined number based on the first status, wherein the stopping processor may be configured to stop the logging if the change of the validity state has occurred the first defined number of times.
  • the apparatus may further com ⁇ prise second number setting processor configured to set a second defined number based on a setting information received from the network, wherein the stopping processor may be configured to stop the logging if the change of the validity state has occurred the second defined number of times.
  • the radio parameter entity may comprise at least one of a common pilot channel received signal code power, a reference signal re ⁇ ceived power, a reference signal received quality, a location information, a time information, and a cell identification.
  • the apparatus according to the second aspect may further com ⁇ prise enabling processor configured to enable a transmitting of the logged measurements when the apparatus is in a con ⁇ nected mode, in which at least one of radio resources, mobil ⁇ ity, and a handover of the apparatus are controlled by the network.
  • the stopping processor may be configured to stop the logging only if the change of the validity state is caused by a change of a pre- defined parameter contained in the system information, or if the maximum validity period of the system information is ex ⁇ pired .
  • the apparatus according to the first or second aspect may be an apparatus for stopping minimization of drive test measure ⁇ ment logging.
  • a third aspect of the invention there is pro ⁇ vided a user equipment comprising an apparatus according to the first or second aspect.
  • a system comprising a network element and an appara ⁇ tus, wherein the network element comprises second network monitoring means configured to monitor a second status of the network, and defining means configured to define, based on the second status, a network setting information; and wherein the apparatus is an apparatus according to the first aspect comprising a second number setting means, and wherein the setting information is based on the network setting information .
  • a system comprising a network element and an apparatus, wherein the network element comprises second network monitoring processor configured to monitor a second status of the network, and defining processor configured to define, based on the second status, a network setting information; and wherein the apparatus comprises measuring processor configured to perform a measurement of a radio parameter entity of a network; logging processor configured to log the meas ⁇ urement; monitoring processor configured to monitor a change of validity state of a system information of a radio resource control; stopping processor configured to stop the logging of the measurement based on the change of the validity state of the system information monitored by the monitoring processor, second number setting processor configured to set a second defined number based on the network setting information received from the network, wherein the stopping means is configured to stop the logging if the change of the validity state has occurred the second defined number of times.
  • the apparatus according to the fourth or fifth aspect may be different from the network element according to the respec ⁇ tive aspect.
  • the system according to the fourth or fifth aspect may be a system of stopping minimization of drive test measurement logging .
  • a sixth aspect of the invention there is pro- vided a method, comprising performing, a measurement of a ra ⁇ dio parameter entity of a network; logging the measurement; monitoring a change of a validity state of a system informa ⁇ tion of a radio resource control; and stopping the logging of the measurement based on the change of the validity state of the system information.
  • the method of the sixth aspect may be a method of stopping minimization of drive test measurement logging.
  • the method of the sixth aspect may be performed by an appara ⁇ tus according to the first or second aspect.
  • the change of the validity state may comprise at least one of a change of the system information and an expiry of a maximum validity period of the system information.
  • the method according to the sixth aspect may further comprise monitoring a first status of the network; and setting a first defined number based on the first status, wherein the logging may be stopped if the change of the validity state has oc ⁇ curred the first defined number of times.
  • the method according to the sixth aspect may further comprise setting a second defined number based on a setting informa ⁇ tion received from the network, wherein the logging may be stopped if the change of the validity state has occurred the second defined number of times.
  • the radio pa ⁇ rameter entity may comprise at least one of a common pilot channel received signal code power, a reference signal re ⁇ ceived power, a reference signal received quality, a location information, a time information, and a cell identification.
  • the method according to the sixth aspect may further comprise enabling a transmitting of the logged measurements when an apparatus performing the method is in a connected mode, in which at least one of radio resources, mobility, and a hand ⁇ over of the apparatus are controlled by the network.
  • the logging may be stopped only if the change of the validity state is caused by a change of a predefined parameter contained in the system information, or if the maximum validity period of the system information is expired.
  • an apparatus performing the method may be comprised by a user equipment.
  • a seventh aspect of the invention there is provided a method, comprising monitoring, by a network element of a network of an apparatus, a second status of the network, and defining, by the network based on the second status, a network setting information;
  • the method of the seventh aspect may be a method of stopping minimization of drive test measurement logging.
  • the apparatus according to the seventh aspect may be differ ⁇ ent from the network element according to the seventh aspect.
  • a computer program product comprising computer- executable components which perform, when the program is run on a computer, the execution of which result in operations of the method according to any of the sixth and seventh aspects.
  • the computer program product according to the eighth aspect may be a computer program product, comprising computer- executable components which perform, when the program is run on a computer, the execution of which result in operations of performing a measurement of a radio parameter entity of a network; logging the measurement; monitoring a change of a validity state of a system information of a radio resource control; and stopping the logging of the measurement based on the change of the validity state of the system information.
  • the computer program product according to the eighth aspect may be embodied as a computer-readable storage medium.
  • Fig. 1 shows an apparatus according to an embodiment of the invention
  • Fig. 2 shows a method according to an embodiment of the in- vention.
  • logged MDT functionality means measuring and logging a radio parameter to transmit it to the network for later evaluation purposes.
  • Starting and stopping MDT measurement logging means at least starting and stopping the logging, respectively, and may additionally mean starting and stopping the measurement itself.
  • idle mode services should be kept at a limited level, a mechanism to control and prevent long lasting operations is needed.
  • the invention targets to provide a trigger that may cease MDT logging active during idle state regardless of a way of con ⁇ figuration .
  • the UE will be configured to perform the requested measurements in its idle state at the predefined trigger (s) and stores (logs) them until it enters from the idle mode into the connected mode.
  • idle mode means a mode, such as scanning of radio channels, registra ⁇ tion UE ' s presence to the selected area, selection evalua ⁇ tion, maintenance of a list of forbidden and allowed areas, cell reselection, initiation of the radio con ⁇ nection, is done autonomously by the UE, whereas in the con ⁇ nected mode, the radio resources, UE ' s mobility, or its hand ⁇ overs are network controlled by its radio resource control. In the idle mode, MDT logs are not sent from the UE to the network .
  • the MDT measurements should be taken at the occurrence of a predefined trig ⁇ ger, which can be a periodical or a failure event (e.g. peri ⁇ odical trigger for downlink pilot measurements) .
  • a predefined trig ⁇ ger which can be a periodical or a failure event (e.g. peri ⁇ odical trigger for downlink pilot measurements) .
  • the recorded data can have a large extent and may affect user ex ⁇ perience significantly.
  • the processing has to be active during idle state. Consequently, the UE memory may reach the limit of its size and there is a risk that the es ⁇ sential data (i.e. those data that are helpful to detect e.g. a coverage problem) will be discarded.
  • sequence of operations lasting for an indefinite period of time is se ⁇ vere in terms of battery life.
  • the UE may take some internal actions to stop the measurements or at least the logging.
  • the decision made by the UE it- self without network awareness hinders the analysis of the reports obtained from the logged measurement data due to likely missing information.
  • the UE is capable to handle the logging operation (i.e. the MDT measurement and storing of the data) successfully, the reporting of the data or may cause the UE to transfer rather large amount of logged meas ⁇ urement data.
  • the anticipated signaling overhead for the following deferred reporting can be also intense and critical .
  • the logging of the MDT measurement is stopped based on a change of a status of the system information.
  • the system information (SI) is monitored by the UE in both the connected and the idle mode.
  • RAT radio access technology
  • it may com ⁇ prise information such as downlink system bandwidth, physical HARQ (hybrid adaptive repeat and request) indicator channel, system frame number; cell access related information, information for cell selection, a frequency band indicator, scheduling information, time division duplex configuration, SI window length, system information value tags; radio resource configuration information common to all UEs, cell-reselection information common for intra-frequency, inter-frequency, and/or inter-radio access technology cell reselection, speed dependent scaling parameters; neighbor cell related informa ⁇ tion, information related to cell reselection to different radio access technologies; home eNodeB identifier; earthquake and tsunami warning system primary notification.
  • HARQ hybrid adaptive repeat and request
  • the information may be grouped together into a master information block (MIB) and system information blocks (SIB) .
  • MIB master information block
  • SIB system information blocks
  • SIB for LTE is described in H. Holma and A. Toskala, "LTE for UMTS”; Wiley & Sons Ltd., (2009), chapter 6.6.2, and in 3GPP specification 36.331 v9.10, section 5.2.
  • SI validity state There are at least the following changes of the SI validity state: updated, i.e., when a new SI is received, and maximum validity period of SI expired.
  • SI is updated, this may be announced by a change notification ( systemlnfoValueTag in LTE) .
  • systemlnfoValueTag in LTE systemlnfoValueTag in LTE
  • an UE may stop MDT logging even if it does not receive a dedicated MDT stop command for whatever reason.
  • the UE ensures about having a valid ver ⁇ sion of System Information anyway and will delete any stored system information after 3 hours from the moment it was confirmed to be valid.
  • the fundamental assumption is the UE stops MDT measurement logging upon exceeding the maximum SI validity duration (i.e. 3 hours after the last update of SI), however is supposed to keep the recorded data until the first reporting possible occasion.
  • the period of 3 hours is employed in some UEs of LTE, but this period may be different in other embodiments, in particular those belonging to another RAT.
  • the moment of the last update of SI to start the maximum validity period may be identified more precisely with the moment when the UE successfully con ⁇ firms the SI .
  • An alternative approach may be applied if the UE is in a ra- dio environment more susceptible to System Information changes. It is a likely scenario that a UE in the area of MDT interest (i.e. with coverage problems) will be straying among cells and overwriting SI repeatedly. Since the UE applies the system information acquisition procedure upon re-selecting a cell or upon return from out of coverage, it may not meet the 3 hour validity restriction. In that case the validity of MDT configuration may be based on a predefined number of notifi ⁇ cation changes or a number of notification changes that is adapted according to specific needs, such as the status of the network or specific parameters thereof.
  • the exact trigger to stop logging of MDT measurement in the idle mode (e.g. number of notification changes that release the corresponding MDT configuration) should be assessed to ensure the UE is not affected by MDT logging unnecessary for undefined period of time and on the other hand that recorded logs will provide sufficient feedback from the UE to figure out the problem in the network.
  • Fig. 1 shows an apparatus according to certain embodiments of the present invention.
  • 50 denotes a measuring means
  • 60 de ⁇ notes a logging means
  • 70 and 80 denote first and second monitoring means
  • 90 denotes a stopping means.
  • the meas- uring means 50 may be a measuring processor
  • the logging means 60 may be a logging processor
  • the first and second monitoring means 70 and 80 may be monitoring processors
  • the stopping means 90 may be a stopping processor.
  • the measuring means 50 is configured to perform one or more measurements that may be used as MDT measurement ( s ) . E.g., such a measurement may be performed by the UE independent on whether or not the MDT measurement is activated, or such a measurement may be performed only, when the MDT measurement is activated.
  • the MDT measurement is logged in the UE by logging means 60.
  • the logging may be performed in a volatile or non-volatile memory of the UE, e.g. depending on the capabilities of the UE.
  • first and second monitoring means 70 and 80 it is monitored whether one of the stopping conditions for the log ⁇ ging is fulfilled.
  • both monitoring means 70, 80 are directly connected to the logging means 60 and to the stopping means 90.
  • only one of the first and second monitoring means 70, 80 may be present, whereas in other embodiments, even more than these two monitoring means may be present.
  • the monitoring means monitor whether or not a certain condition related to a validity change of the system information is fulfilled.
  • the stopping means 90 is configured to stop the logging of the MDT measurement by the logging means 60 if at least one of the first and second monitoring means 70, 80 decides that a monitored condition is fulfilled.
  • Fig. 2 shows a method according to the certain embodiments of the present invention.
  • a measurement of a radio parameter is performed.
  • the measurement may be performed by the UE inde- pendent on whether or not MDT measurements are activated, or may be a special measurement for MDT purposes only.
  • step S60 the measurement is logged by the logging means.
  • step S70 it is checked, whether a condition for stopping the MDT measurement logging is fulfilled.
  • the condition is whether a certain time based on a maximum validity period of the system information has lapsed.
  • step S90 If the condition is fulfilled, the procedure goes forward to step S90, and the logging is stopped.
  • step S80 another condi- tion for stopping the MDT measurement logging is checked.
  • the condition is whether a certain number of system information changes since the triggering of the MDT measurement logging has occurred. If the condition is fulfilled, the procedure goes forward to step S90, and the logging is stopped.
  • the procedure goes back to the logging step S60 to log the next measurement data of the measuring step S50.
  • the method may return to the measurement step S50, and if at least one of the conditions in steps S70 and S80 is fulfilled, the method may proceed to a step of stopping the performing of the measurement in addition to the stopping of logging in step S90.
  • This embodiment is advanta ⁇ geous if a measurement is started only for MDT measurement purposes .
  • the sequence of steps S70 and S80 may be interchanged or only one of these steps may be present.
  • the method of Fig. 2 may be performed by the apparatus of Fig. 1.
  • the UE respects the configuration and performs MDT measure ⁇ ments (including logging) ordered by the network it is attached to unless one of the restrictions is met:
  • the SI validity timer (or its multiplication: X (X > 1) expires; i.e. the maximum validity period of the System
  • SI Information
  • An update of the SI may be indicated by a notifi ⁇ cation such as systemlnfoValueTag .
  • X and Y may be considered as constant predefined values .
  • the X and/or Y value may be determined either by the UE, or by the network (e.g. evolved NodeB (eNB) or radio network controller (RNC) ) depending on the UE ' s capabilities, network situation, or certain problem that is to be discovered.
  • the network e.g. evolved NodeB (eNB) or radio network controller (RNC)
  • the value (s) may be easily trans ⁇ ported as a part of MDT report to the network.
  • the network is configured to adapt these values, they may be easily transmitted to the UE together with the other MDT configuration data. The manner of X and Y determination may be done in a way to ease scheduled logging.
  • the MDT configuration Since the MDT configuration is broadcasted or signalled in the problematic area in terms of network coverage, it ad ⁇ dresses UEs present in that region. Many affected UEs may re ⁇ side in the area and in addition some may enter the connected mode rarely. For these UEs, monitoring of lapse of maximum SI validity period should be sufficient. Note that the lapse of the maximum validity period of the SI is measured from the last update of SI and not necessarily from the last update of the MDT configuration. On the other hand the configuration may affect UEs that sub ⁇ sequently migrate in the area of interest or change the loca ⁇ tion among several cells due to cells' boundary. Conse ⁇ quently the UEs experience radio network resource changes (in particular SI changes) frequently in that region.
  • the mechanism will be known to the UE and the eNB/RNC, it makes the functionality easier, in general and eases management of the logging functionality. In particular, it smoothes a way to manage the stored data, minimize its amount, avoid memory exhausting and battery drain, hence it helps to limit the end-user impact and avoid of implementa ⁇ tion complexity in the UE .
  • the modules shown for the exemplary embodiments of Fig. 1 may be separate modules, or some or all of the modules may be im ⁇ plemented in one module.
  • the modules may be implemented in software, firmware, hardware, or a combination thereof.
  • the user equipment and/or the system according to an embodiment may be of the long term evolution (LTE) standard and, more particularly, of release 10 or a higher release of this standard.
  • LTE long term evolution
  • the MDT measurement logging is stopped based on the lapse of the maximum validity period of the system information or the number of the system informa- tion changes after triggering the MDT measurement logging.
  • the UE may store a successfully confirmed SI and compare it regu ⁇ larly with the current SI.
  • the number of changes of one of the parameters contained in the system information and/or the number of changes of the master information block or a certain system information block may be monitored to stop the logging of MDT measurements.
  • the number of changes of one of the parameters contained in the system information and/or the number of changes of the master information block or a certain system information block may be monitored to stop the logging of MDT measurements.
  • an MDT meas ⁇ urement logging is performed because of problems in intra-RAT handovers
  • changes of the system information related to in- ter-RAT handovers may not be taken into account for stopping the MDT measurement logging.
  • the stopping may be based on only one a monitoring of the : aximum validity period of the SI or a number of changes of the SI after the triggering of the log ging .
  • storing (logging) of the measurement may mean storing of the raw data (i.e., measured data as they are) , while in other embodiments or for another measurement the data may be processed before storing, e.g. the data may be aggregated and/or normalized.
  • the invention is favourably usable in the idle mode, but it may be applied to the connected mode, too, if for some rea- son, some measurement reports should not be reported continu- ously to the network.
  • some or all of the measurements, which are logged for the MDT feature may be stopped, too.
  • the condition to stop a MDT measurement logging may be based on the maximum validity period of the SI as in the example above. However, in some embodiments, instead of stopping the MDT measurement logging when the maximum validity period has lapsed for a certain number of times, the MDT measurement logging may only be stopped after another "after-period" of time has lapsed after the maximum validity period has lapsed for a certain number of times. The same may apply to the num ⁇ ber of changes being a condition to stop.
  • the measurement logging may be continued for some time after the defined number of SI changes has occurred, e.g. for a predetermined "after-period” of time or for an "after-period” of time depending on some condition.
  • the "after-period” may depend on a status of the network, observed by the UE itself or by a network element and communicated to the UE .
  • exemplary embodiments of the present invention pro- vide, for example a user equipment, or a component thereof, an apparatus embodying the same, a method for controlling and/or operating the same, and computer program (s) control ⁇ ling and/or operating the same as well as mediums carrying such computer program (s) and forming computer program prod- uct ( s ) .
  • an appara- tus comprising measuring means configured to perform a measurement of a radio parameter entity of a network; logging means configured to log the measurement; monitoring means configured to monitor a change of validity state of a system information of a radio resource control; and stopping means configured to stop the logging of the measurement based on the change of the validity state of the system information monitored by the monitoring means.
  • Implementations of any of the above described blocks, appara ⁇ tuses, systems, techniques or methods include, as non limit ⁇ ing examples, implementations as hardware, software, firm ⁇ ware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention porte sur un appareil comprenant des moyens de mesure configurés pour réaliser une mesure d'une entité de paramètre radio d'un réseau; des moyens de journalisation configurés pour journaliser la mesure; des moyens de surveillance configurés pour surveiller un changement de l'état de validité d'informations de système d'une commande de ressource radio; et des moyens d'arrêt configurés pour arrêter la journalisation de la mesure sur la base du changement de l'état de validité des informations de système surveillées par les moyens de surveillance.
PCT/EP2010/054294 2010-03-31 2010-03-31 Arrêt de minimisation de la journalisation de mesure d'essais de commande WO2011120571A1 (fr)

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WO2017052785A1 (fr) * 2015-09-25 2017-03-30 Qualcomm Incorporated Externalisation ouverte à efficacité améliorée de données relatives à un réseau sans fil
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103118377A (zh) * 2011-11-16 2013-05-22 华为技术有限公司 最小化路测的方法和装置
US10349299B2 (en) 2015-03-23 2019-07-09 Telefonaktiebolaget Lm Ericsson (Publ) Technique for controlling minimizing of drive tests log tracing of user equipment in idle mode
WO2017052785A1 (fr) * 2015-09-25 2017-03-30 Qualcomm Incorporated Externalisation ouverte à efficacité améliorée de données relatives à un réseau sans fil

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