WO2004043101A1 - Unite de communication et procede associe pour communiquer des rapports de mesure - Google Patents

Unite de communication et procede associe pour communiquer des rapports de mesure Download PDF

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Publication number
WO2004043101A1
WO2004043101A1 PCT/EP2003/050689 EP0350689W WO2004043101A1 WO 2004043101 A1 WO2004043101 A1 WO 2004043101A1 EP 0350689 W EP0350689 W EP 0350689W WO 2004043101 A1 WO2004043101 A1 WO 2004043101A1
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Prior art keywords
measurement
communication unit
physical layer
previous
characteristic
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PCT/EP2003/050689
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English (en)
Inventor
Peter Legg
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Motorola Inc
Motorola Limited
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Application filed by Motorola Inc, Motorola Limited filed Critical Motorola Inc
Priority to EP03775408A priority Critical patent/EP1563703A1/fr
Priority to AU2003283440A priority patent/AU2003283440A1/en
Publication of WO2004043101A1 publication Critical patent/WO2004043101A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements

Definitions

  • the invention relates to a communication unit and method of communicating measurement reports therefor and in particular to a system of communicating measurements in a cellular communication system.
  • FIG. 1 illustrates the principle of a conventional cellular communication system 100 in accordance with prior art.
  • a geographical region is divided into a number of cells 101, 103, 105, 107 each of which is served by base station 109, 111, 113, 115.
  • the base stations are interconnected by a fixed network which can communicate data between the base stations 101, 103, 105, 107.
  • a mobile station is served via a radio communication link by the base station of the cell within which the mobile station is situated.
  • mobile station 117 is served by base station 109 over radio link 119
  • mobile station 121 is served by base station 111 over radio link 123 and so on.
  • mobile station 125 may move from the coverage of one base station to the coverage of another, i.e. from one cell to another.
  • mobile station 125 is initially served by base station 113 over radio link 127.
  • base station 115 As it moves towards base station 115 it enters a region of overlapping coverage of the two base stations 111 and 113 and within this overlap region it changes to be supported by base station 115 over radio link 129.
  • base station 115 As the mobile station 125 moves further into cell 107, it continues to be supported by base station 115. This is known as a handover or handoff of a mobile station between cells.
  • a typical cellular communication system extends coverage over typically an entire country and comprises hundred or even thousands of cells supporting thousands or even millions of mobile stations.
  • Communication from a mobile station to a base station is known as uplink, and communication from a base station to a mobile station is known as downlink.
  • the fixed network interconnecting the base stations is operable to route data between any two base stations, thereby enabling a mobile station in a cell to communicate with a mobile station in any other cell.
  • the fixed network comprises gateway functions for interconnecting to external networks such as the Public Switched Telephone Network (PSTN), thereby allowing mobile stations to communicate with landline telephones and other communication terminals connected by a landline.
  • PSTN Public Switched Telephone Network
  • the fixed network comprises much of the functionality required for managing a conventional cellular communication network including functionality for routing data, admission control, resource allocation, subscriber billing, mobile station authentication etc.
  • GSM Global System for Mobile communication
  • TDMA Time Division Multiple Access
  • a base station may be allocated a single carrier or a multiple of carriers.
  • One carrier is used for a pilot signal which further contains broadcast information. This carrier is used by mobile stations for measuring of the signal level of transmissions from different base stations, and the obtained information is used for determining a suitable serving cell during initial access or handovers.
  • Further description of the GSM TDMA communication system can be found in 'The GSM System for Mobile Communications' by Michel Mouly and Marie Bernadette Pautet, Bay Foreign Language Books, 1992, ISBN 2950719007.
  • 3 rd generation systems are being rolled out to further enhance the communication services provided to mobile users.
  • the most widely adopted 3 rd generation communication systems are based on Code Division Multiple Access (CDMA) wherein user separation is obtained by allocating different spreading and scrambling codes to different users on the same carrier frequency.
  • CDMA Code Division Multiple Access
  • the transmissions are spread by multiplication with the allocated codes thereby causing the signal to be spread over a wide bandwidth.
  • the codes are used to de-spread the received signal thereby regenerating the original signal.
  • Each base station has a code dedicated for a pilot and broadcast signal, and as for GSM this is used for measurements of multiple cells in order to determine a serving cell.
  • UMTS Universal Mobile Telecommunication System
  • CDMA Wideband CDMA
  • WCDMA Wideband CDMA
  • the fixed network comprises a core network and a Radio Access Network (RAN).
  • the core network is operable to route data from one part of the RAN to another, as well as interfacing with other communication systems. In addition, it performs many of the operation and management functions of a cellular communication system.
  • the RAN is operable to support wireless user equipment over a radio link being part of the air interface.
  • the RAN of a UMTS cellular communication network comprises the base stations, known as Node Bs, as well as Radio Network Controllers (RNCs).
  • the RNC performs many of the control functions related to the air interface including radio resource management and routing of data to and from appropriate Node Bs. It further provides the interface between the RAN and the core network.
  • An RNC and associated Node Bs is known as a Radio Network System (RNS).
  • RNS Radio Network System
  • the RNC In a UMTS communication system, significant amounts of the air interface management is performed in the RNC. For example, traffic schedulers for packet communication are implemented in the RNCs. In order for these air interface management functions to be effectively performed in the RNC, it is important that the RNC receives information of various current air interface characteristics and parameters. For example, in order to perform an efficient scheduling, the scheduler typically requires information related to the expected transmit power and thus interference caused for data packets for different users. Accordingly, the Node Bs need to communicate substantial amounts of information related to the air interface to the Node B, and in particular to communicate substantial amounts of measurement information. Accordingly, the UMTS specifications provide for measurement messages to be reported between a Node B and an RNC at a given frequency.
  • an initial measurement report may not be representative of the typical or average conditions, but may represent a specific fade condition that is not typical for the mobile station.
  • the measurement reporting in a cellular communication system is thus subject to a number of disadvantages. Hence, a system allowing for improved measurement reporting would be an advantage.
  • the Invention preferably seeks to mitigate, alleviate or eliminate one or more of the above mentioned disadvantages singly or in any combination.
  • the Inventor has realised that the current approach for measurement reporting in a cellular communication system is suboptimal and can be improved.
  • improved measurement reporting can be achieved by dynamically changing the parameters or characteristics of the measurement reporting.
  • a method of communicating measurement reports in a cellular communication system having a fixed network supporting remote communication units comprising the steps of- in a first communication unit determining physical layer measurement characteristics in response to an air interface physical layer parameter associated with a remote communication unit; communicating measurement reports comprising the physical layer measurement characteristics from the first communication unit to a network element; further comprising the step of dynamically updating an interval between measurement reports in response to an operating characteristic of the cellular communication system.
  • the invention allows for the measurement reporting from the first communication unit to the network element to be optimised to suit the current operating characteristics of the cellular communication system.
  • the measurement reporting may specifically be dynamically updated to allow for an efficient trade off between the adverse effects of a specific reporting frequency.
  • the interval may be updated to provide for a suitable trade off between the communication and computational resource required, and the measurement reporting accuracy. For example, if there is sufficient communication and computational resource available, a short interval may be set to improve the accuracy of the measurement reporting. If the available communication or computational resource decreases, the interval may be extended in return for a degraded accuracy.
  • the first communication unit may specifically be a base station, such a ⁇ a Node B.
  • the network element may for example be a radio equipment controller, such as an RNC.
  • the remote communication unit may specifically be a subscriber unit, such as a wireless user equipment, a mobile station, a communication terminal, a personal digital assistant, a laptop computer, an embedded communication processor or any other communication element communicating over the air interface.
  • the operating characteristic comprises a number of remote communication units that are supported by the first communication unit.
  • the interval between measurement reports is dynamically updated in response to how many remote communication units are supported by the first communication unit.
  • the computational and communication resource of the first communication unit typically increases for increasing numbers of remote communication units being supported. Updating the interval in response thereto allows for adjusting the measurement reporting to suit the current resource requirements and availability.
  • the operating characteristic comprises a number of remote communication units that are supported by the network element.
  • the interval between measurement reports is dynamically updated in response to how many remote communication units are supported by the network element.
  • the computational and communication resource of the network element typically increases for increasing numbers of remote communication units being supported by the network element. Updating the interval in response thereto allows for adjusting the measurement reporting to suit the current resource requirements and availability.
  • the operating characteristic comprises a duration that the remote communication unit has been supported by the first communication unit.
  • the interval may be increased for an increasing duration.
  • the accuracy of physical layer measurement characteristics tend to increase the longer a remote communication unit has been supported by a given first communication unit. Specifically the accuracy may increase as the time available for averaging of measurements increases. Updating the interval in response thereto allows for adjusting the measurement reporting to suit the current measurement accuracies.
  • the operating characteristic comprises a difference between a physical layer measurement characteristic of a first measurement report and a physical layer measurement characteristic of a second measurement report.
  • the interval may be set to correspond to a time taken until the physical layer measurement characteristic has changed by a given value.
  • the interval may be updated by the second measurement report being transmitted when the transmit power has changed by more than a given amount. This allows for the measurement reporting to be adapted to the dynamic variation of the physical layer measurement characteristics.
  • the operating characteristic comprises an available communication capacity of a connection between the first communication unit and the network element. This allows for the available communication capacity to be efficiently used yet reduces the probability of it being exceeded.
  • the measurement reports are communicated substantially periodically and the interval between measurement reports is updated by modifying the frequency of the measurement reports. This allows for a suitable, effective and easy way to implement the updating of the interval between measurement reports.
  • a measurement report is communicated when a first value of the physical layer measurement characteristic differs from a reported value of the physical layer measurement characteristic in a previous measurement report by more than a threshold.
  • the threshold relates to an increased and/or decreased value of the physical layer measurement characteristic. This allows for measurement reports to be communicated only when significant changes to the measured parameters have occurred.
  • a new measurement report may specifically be communicated when the physical layer measurement characteristic reaches a value given as a threshold difference from a previously reported physical layer measurement characteristic.
  • the threshold is determined in response to a previous physical layer measurement characteristic, and specifically the previous physical layer measurement characteristic may be comprised in a previous measurement report.
  • the threshold value may be dependent on a previous measurement value or reported physical layer measurement characteristic.
  • the threshold may be a relative value of a previous reported physical layer measurement characteristic, such as for example 10% of the previously reported physical layer measurement characteristic. This may allow for the measurement reporting to be adapted to the currently prevailing operating conditions and specifically to the currently prevailing measurement values.
  • the network element comprises a resource allocator.
  • An efficient measurement reporting adapted to the current conditions may thus be provided to a network element for use in resource allocation, thereby enabling an improved resource allocation and thus the possibility of an increased capacity and/or quality of service for the communication system.
  • the network element comprises a traffic scheduler.
  • An efficient measurement reporting adapted to the current conditions may thus be provided to a network element for use in traffic scheduling, thereby enabling an improved traffic scheduling.
  • the physical layer measurement characteristic is a power measurement characteristic
  • the air interface physical layer parameter is a transmit power associated with the remote communication unit.
  • the transmit power associated with the remote communication unit is a transmit power of the first communication unit when transmitting to the remote communication unit.
  • the measurement reporting of a transmit power associated with the remote communication unit may thus be adapted to the current operating conditions, thereby allowing an improved measurement reporting, and thus the possibility of improved accuracy. This may for example assist a resource allocation or traffic scheduling and thus allows for improved performance of the communication system.
  • a communication unit for a cellular communication system having a fixed network supporting remote communication units! the communication unit comprising: a measurement processor for determining physical layer measurement characteristics in response to an air interface physical layer parameter associated with a remote communication unit; a communication element for communicating measurement reports comprising the physical layer measurement characteristics to a network element; and an update processor for dynamically updating an interval between measurement reports in response to an operating characteristic of the cellular communication system.
  • the communication unit further comprises: a measurement unit for performing power measurements! a filter for generating filtered power measurements from the power measurements at a first rate; and wherein the measurement processor is operable to generate the physical layer measurement characteristics from the filtered power measurements substantially at the first rate; and the communication element is operable to update the interval between measurement reports by not communicating some power measurement characteristics to the network element.
  • FIG. 1 is an illustration of a cellular communication system in accordance with the prior art
  • FIG. 2 is an illustration of a UMTS communication system comprising a base station in accordance with an embodiment of the invention " ,
  • FIG. 3 illustrates an example of a measurement processor in accordance with an embodiment of the invention
  • FIG. 4 is an illustration of an example of a physical layer characteristic variation as a function of time, and of the resulting filtered and measured values
  • FIG. 5 is an illustration of a method of communicating measurement reports in accordance with an embodiment of the invention.
  • FIG. 6 illustrates an example of a dynamically updated measurement reporting of a physical layer characteristic in accordance with an embodiment of the invention! and
  • FIG. 7 illustrates an example of a dynamically updated measurement reporting of a physical layer characteristic in accordance with an embodiment of the invention.
  • FIG. 2 is an illustration of a UMTS communication system 100 comprising a base station 101 in accordance with an embodiment of the invention.
  • the base station 101 is supporting 3 different remote communication units, which specifically are subscriber units 103, 105. Communication between the subscriber units 103, 105 and the base station 101 are by means of communication links 107 over the air interface.
  • the base station 101 is connected to a Radio Network Controller (RNC) 109.
  • RNC Radio Network Controller
  • other base stations 111 are connected to the RNC 109.
  • the RNC 109 performs a number of radio and air interface management functions for the base stations 101, 111 including resource allocation, traffic scheduling, quality of service management and handover management. Many of these functions are based on air interface parameters that can only be determined at the base stations 109, 111 or subscriber units 103, 105. Accordingly, the base stations 101, 111 and/or subscriber units 103, 105 perform a number of measurements of characteristics related to the physical layer of the air interface. These measurements may include determination of internal parameters such as the transmit power used to communicate with a specific subscriber unit or base station. Alternatively or additionally, the measurements may include measurements of external parameters, and specifically of parameters associated with the radio environment such as an interference level.
  • the base station 101 is connected to the RNC 109 by a fixed line communication link, 113.
  • the interface between an RNC and a base station is in UMTS known as the I u b interface.
  • the RNC 109 is connected to a Mobile Switching Centre (MSC) 115.
  • MSC Mobile Switching Centre
  • a large number of RNCs are connected to an MSC.
  • the MSC is a central switch centre that switches communication between different RNCs such that subscriber units connected to one RNC can communicate with subscriber units associated with another RNC.
  • the MSC is responsible for interfacing with other networks, performing authentication, some mobility management etc.
  • the RNC 109 is typically also connected to one or more Serving GPRS Service Nodes (SGSN) which are operable to route packet data towards the packet destination.
  • SGSN Serving GPRS Service Nodes
  • the RNC 109 specifically comprises a resource allocator that allocates available radio resource between different services and subscriber units.
  • the resource allocation is partially based on the physical layer measurement characteristics received from the base station.
  • the RNC 109 comprises a traffic scheduler that schedules packet transmissions to the different subscriber units.
  • the radio conditions for different subscriber units must be taken into account, and thus the scheduling is performed in response to the physical layer measurement characteristics received from the base stations.
  • the transmit power of a base station may in many cases be a limiting factor for resource allocation and scheduling.
  • the physical layer measurement characteristics received from the base station comprise an indication of an expected transmit power for communicating with a specific subscriber unit. The resource allocation and scheduling is thus performed such that the combined expected transmit powers for a base station is below the maximum available.
  • the base station 101 comprises a measurement processor 117.
  • the measurement processor 117 determines physical layer measurement characteristics associated with at least one air interface physical layer parameter.
  • the physical layer parameter is associated with a remote communication unit.
  • the physical layer parameter is a transmit power used or required by the base station 101 to communicate with a specific subscriber unit 103.
  • the transmit power is controlled by a power control loop to meet a given quality of service level (and specifically the power control loop controls the transmit power to provide a given signal to interference ratio).
  • the transmit power is measured from the parameter values and/or settings generated by the power control loop.
  • the physical layer measurement characteristic specifically corresponds to a filtered version of the physical layer parameter measurements.
  • the base station 101 further comprises a communication element 119 for communicating measurement reports comprising the physical layer measurement characteristics to a network element of the fixed network, which in the example of FIG. 2 specifically is the RNC 109.
  • FIG. 3 illustrates an example of a measurement processor 117 in accordance with an embodiment of the invention.
  • the measurement processor 117 comprises a first filter 301 which receives measurements related to the physical layer.
  • the measurements may be a measurement of a transmit power as controlled by the power control loop.
  • the measurements may be received from any suitable source including internal measurements in the base station, or measurements received over the air interface from a subscriber unit.
  • the measurements may relate to internal parameters or external parameters.
  • the base station 101 further comprises a measurement unit (not shown) which performs power measurements, and in particular by deriving a transmit power estimate from the status of the power control loop.
  • the power measurements are provided to the first filter 301 at any suitable rate.
  • the first filter 301 generates filtered power values, which for a typical UMTS base station are fed to a second filter 303.
  • the second filter 303 provides further filtering of the power measurements in accordance with a set of parameters received from an input 305. Hence, the second filter 303 generates filtered power measurements from the power measurements.
  • the power measurements are provided periodically at a given frequency. In a conventional base station, the frequency may be set to a value between 10Hz and 1 Hz but is maintained constant once set.
  • the second filter 303 is connected to a measurement report generator 307.
  • the filtered power measurements are fed to the measurement report generator 307, which includes the power measurements in a measurement report.
  • the measurement report is then fed to the communication element 119 for transmission to the RNC 109.
  • the measurement report generator 307 may receive further measurement values through a second measurement input 311.
  • the measurement reports are generated in response to a number of pre-selected parameters, which are received through a parameter input 309. In a conventional UMTS base station, the measurement reports are communicated at a constant frequency.
  • the constant measurement reporting frequency may be set to be between 1Hz and 10 Hz.
  • FIG. 4 is an illustration of an example of a physical layer characteristic variation as a function of time and of the resulting filtered and measured values.
  • FIG. 4 shows a measurement reporting typical for a conventional UMTS base station.
  • FIG. 4 illustrates a specific example of a variation of transmit power as a function of time 401.
  • the filtered transmit power value 403 is shown as a function of time. The example shown corresponds to a measurement process performed at the start of a transmission and thus reflects the initial variations of the transmit power value and the filtered power values.
  • the transmit power varies substantially and is initially relatively low corresponding to favourable propagation conditions.
  • the transmit power consequently increases as the subscriber unit enters a fade and the transmit power continues to vary according to the changes in the propagation and interference conditions.
  • the filtered transmit power value 403 is initially substantially identical to the transmit power, but moves towards an average value as the time over which the averaging may be performed increases.
  • FIG. 4 further illustrates the transmit power values reported at a reporting rate of 10Hz 405 and a reporting rate of 1Hz 407 respectively.
  • power measurements begin when the path loss is small (anti-fade), so the first measurement report 405, 407 after 100ms is much lower than the typical or average transmit power value.
  • the measurement is not representative of the expected transmit power, and the use of this reported measurement value is likely to result in suboptimal performance of for example a resource allocator or traffic scheduler in the RNC 109.
  • the reported power measurement values 405 quickly tend towards the average or typical value, reflecting the convergence in the second filter 303.
  • the measurement value should be representative and equal performance can be expected for the two measurement rates thereafter.
  • a low frequency measurement reporting provides reduced performance in the RNC 109.
  • a higher reporting rate provides an excessive burden on the communication capacity of the communication link 113 between the base station 101 and the RNC 109 (the Iub interface). It further requires excessive computational resource in the base station 101 in order to generate the measurement reports and in the RNC 109 in order to process the measurement reports.
  • the base station 101 further comprises an update processor 121.
  • the update processor 121 is connected to the measurement processor 117 and is operable to dynamically update an interval between measurement reports in response to an operating characteristic of the cellular communication system.
  • FIG. 5 is an illustration of a method of communicating measurement reports in accordance with an embodiment of the invention. The method is applicable to the base station 101 of FIG. 2 and will be described with reference to this.
  • step 501 physical layer measurement characteristics are determined in response to an air interface physical layer parameter associated with a remote communication unit.
  • the measurement processor generates the physical layer measurement characteristics from a filtering of transmit power measurements.
  • the update processor 121 determines a suitable interval between measurement reports.
  • the measurement report is generated at the appropriate time as determined by the update processor. Specifically, the update processor may update the interval by detecting the occurrence of a specific event or condition and trigger a measurement report generation in response.
  • step 507 the measurement report comprising the physical layer measurement characteristics is transmitted to the RNC 109 by the communication element 119.
  • the interval between measurement reports may be updated in any suitable way.
  • the interval is controlled by transmitting the measurements substantially periodically but at a dynamically updated frequency.
  • a first reporting frequency may be used in an initial time interval after which a second and slower frequency rate may be used.
  • FIG. 6 illustrates an example of a dynamically updated measurement reporting of a physical layer characteristic in accordance with an embodiment of the invention.
  • FIG. 6 illustrates the same transmit power variation 401 and filtered transmit power variation 403 as FIG. 4.
  • measurement reports are initially generated at a higher rate.
  • measurement reports 601 are generated at a rate of 10Hz, i.e. with a measurement report interval of 100ms.
  • the filter output has converged reasonably towards the typical value (as is the case in the example shown in FIG. 6).
  • the measurement reporting changes to a lower frequency.
  • this frequency corresponds to a measurement report interval of 600ms and the next measurement report 603 is generated 1 second after the first measurement.
  • the measurement reports may after this be reported at a lower rate and specifically may be reported at the lowest possible rate, which for a UMTS node B is 1Hz.
  • this approach allows for the measurement reporting to be high during the initial period, when the measurements reported are likely to be inaccurate and changing substantially, and to be low following the initial period thus reducing the communication and computational resource burden.
  • the interval between measurement reports may be updated in response to any suitable operating characteristic of the cellular communication system.
  • the operating characteristic comprises a number of remote communication units that axe supported by the first communication unit.
  • the interval is set in response to the number of subscriber units for which the base station is the serving base station. The more subscriber units that are served by a given base station, the more measurement reports need to be generated by the base station and thus communicated to the RNC. As both the computational and communication resource is typically substantially constant, a lower number of supported subscriber units allows for more communication and computational resource to be available for each, thereby allowing for an increased frequency of measurement reports for each subscriber unit. In the preferred embodiment, the interval between measurement reports is therefore increased for increasing numbers of subscriber units supported by that base station. Specifically, the number of subscriber units supported by a base station may in the preferred embodiment be determined as the number of subscriber units that are allocated a dedicated control channel.
  • the operating characteristic may comprise a number of remote communication units that are supported by the network element.
  • the resource requirements of the network element typically increase for an increasing number of measurement reports. Accordingly, the interval between measurement reports may preferably be increased for increasing an number of remote communication units supported.
  • the network element in the form of an RNC, may determine how many subscriber units are supported by the base stations served by the RNC, and the available resource for measurement reporting for each base station may be determined. This value may be reported to the base stations, which may then individually adjust the measurement report intervals for each subscriber unit, such that the total allocated number of measurement reports is not exceeded.
  • the operating characteristic may comprise a duration that the remote communication unit has been supported by the first communication unit.
  • a high measurement report frequency may be set for an initial interval and a lower measurement report frequency may be set for subsequent intervals. This effectively allocates the measurement report resource to subscriber units for which the measurement values may not have converged substantially, and thus may vary significantly in shorter time intervals.
  • the base station may specifically detect for how long a subscriber unit has been allocated a dedicated control channel and set the measurement reporting frequency in response to this.
  • the operating characteristic comprises a difference between a physical layer measurement characteristic of a first measurement report, and a physical layer measurement characteristic of a second measurement report.
  • the measurement report interval or frequency may be set in response to the difference between the measurement values of subsequent measurement reports. For example, the difference between two measurement values of subsequent measurement reports may be detected, and the interval to the next measurement report may be increased for lower differences.
  • a measurement report frequency may dynamically and continuously be updated in response to the difference between measurement values of the measurement reports. In particular, this approach may be used to detect that the measurement report values are converging towards a steady value, such that the measurement report frequency can be increased.
  • the operating characteristic may comprise an available communication capacity of a connection between the first communication unit and the network element.
  • the interval may further be set in response to the spare capacity of the communication link 113 between the base station 101 and the RNC 109.
  • the measurement report frequency may be increased when communication capacity is available and reduced when the maximum capacity is approached.
  • the interval is updated by communicating a new measurement only when a specific condition occurs. Specifically, a new measurement report is communicated when a first value of the physical layer measurement characteristic differs from a reported value of the physical layer measurement characteristic in a previous measurement report by more than a threshold.
  • the physical layer parameter such as the transmit power
  • the physical layer measurement characteristics may be used as representing the physical layer parameter, and thus a new measurement may be generated when a physical layer measurement characteristic differs from the previously reported physical layer measurement characteristic by more than a given threshold.
  • the update processor 121 for each measurement report determines an upper value and a lower value that the physical layer parameter or physical layer measurement characteristic must exceed before a new measurement report is sent.
  • the upper value is determined by adding the threshold to the measurement value of the previous measurement report, and the lower value is determined by subtracting the threshold from the measurement value of the measurement report.
  • the same threshold is used for determining the upper and lower values, but in other embodiments, different thresholds may be used for the upper and lower values.
  • the threshold by which the physical layer parameter should increase or decrease before a new measurement report is generated is determined in response to a previous physical layer measurement characteristic. For example, a threshold may be given as a percentage of the previously reported measurement value, thereby providing for a new measurement report to be generated for the same relative difference regardless of the absolute values.
  • the threshold may be determined in response to an initial physical layer measurement characteristic. For example, the threshold may be varied in response to a duration since the initial measurement report.
  • FIG. 7 illustrates an example of a dynamically updated measurement reporting of a physical layer characteristic in accordance with an embodiment of the invention, wherein the measurement reports are generated in response to a specific condition occurring.
  • FIG. 7 illustrates the same transmit power variation 401 and filtered transmit power variation 403 as FIG. 4 and 6.
  • a first measurement report 701 is communicated after 100ms.
  • the update processor 121 determines a first upper threshold value 703 by adding a predetermined absolute threshold value to the measurement value of the first measurement report 701. It further subtracts the threshold value from the measurement value of the first measurement report 701. However, this results in a negative transmit power threshold, and therefore a first lower threshold value 705 is set at half the measurement value of the first measurement report 701. .
  • the first upper and lower threshold values 703, 705 are communicated to the measurement processor 117, which continually monitors the filtered transmit power values to detect if the threshold values are reached.
  • the first upper threshold value 703 is reached by the filtered transmit power variation 403, and accordingly a second measurement report 707 is generated and communicated to the RNC 109.
  • the update processor 121 generates a second upper threshold value 709 by adding the threshold to the measurement value of the second measurement report 707, and a second lower threshold value 711 by subtracting the threshold from the measurement value of the second measurement report 707.
  • These values 709, 711 are communicated to the measurement processor 117.
  • the measurement processor 117 detects that the upper threshold value is exceeded by the filtered transmit power, a third measurement report 713 is generated and communicated to the RNC 109. Consequently, the update processor 709 determines third upper and lower threshold values 715, 717. In the specific example of FIG. 7, these threshold values are not exceeded, and thus no further measurement reports are generated.
  • the invention can be implemented in any suitable form including hardware, software, firmware or any combination of these. However, preferably, the invention is implemented as computer software running on one or more data processors.
  • the elements and components of an embodiment of the invention may be located in the core network, the radio access network or any suitable physical or functional location. Indeed the functionality may be implemented in a single unit, in a plurality of units or as part of other functional units. As such, the invention may be implemented in a single unit or may be physically and functionally distributed in the network.

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Abstract

Selon l'invention, une station de base (101) comprend un processeur de mesure (117) qui sert à déterminer des caractéristiques de mesure de couche physique, telles que la puissance d'émission filtrée, en réponse à un paramètre de couche physique d'interface hertzienne, tel que la puissance d'émission non filtrée, associé une unité d'abonné (103). Ladite station de base comprend également un élément de communication (119) qui sert à communiquer des rapports de mesure à un élément réseau (109) tel qu'un RNC (contrôleur de réseau radio). La station de base (101) comprend aussi un processeur de mise à jour (121) qui permet la mise à jour dynamique d'une intervalle entre les rapports de mesure en réponse à une caractéristique de fonctionnement du système de communication cellulaire. L'intervalle peut être mise à jour par modification d'une fréquence de rapports de mesure qui dépend du nombre d'unités d'abonné prises en charge, du temps de prise en charge écoulé, et des ressources disponibles. L'intervalle peut également être mise à jour grâce à un nouveau rapport de mesure produit uniquement lorsque la caractéristique de mesure de couche physique diffère de la dernière caractéristique de mesure de couche physique d'une valeur supérieure à une valeur seuil.
PCT/EP2003/050689 2002-11-07 2003-10-03 Unite de communication et procede associe pour communiquer des rapports de mesure WO2004043101A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP03775408A EP1563703A1 (fr) 2002-11-07 2003-10-03 Unite de communication et procede associe pour communiquer des rapports de mesure
AU2003283440A AU2003283440A1 (en) 2002-11-07 2003-10-03 A communication unit and method of communicating measurement reports therefor

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WO2008095043A2 (fr) 2007-01-30 2008-08-07 Qualcomm Incorporated Contraintes de canaux de commande dans des communications sans fil
KR101169842B1 (ko) * 2007-01-30 2012-07-30 콸콤 인코포레이티드 무선 통신에서의 제어 채널 제약들
US8743774B2 (en) 2007-01-30 2014-06-03 Qualcomm Incorporated Resource requests for a wireless communication system
US20180077616A1 (en) * 2015-06-01 2018-03-15 Telefonaktiebolaget Lm Ericsson (Publ) Methods used in cluster manager, radio node and control node, and associated devices
US10070332B2 (en) 2007-06-21 2018-09-04 Interdigital Technology Corporation Method and apparatus for measurement reporting and event-triggered periodic measurement reporting in an evolved universal terrestrial radio access network

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CN100442936C (zh) * 2006-04-12 2008-12-10 华为技术有限公司 一种无线通信系统中的切换方法和切换装置
US20070264938A1 (en) * 2006-05-10 2007-11-15 Bhaskar Srinivasan Method and system for adaptive link monitoring in wireless sensor networks
CN101321356B (zh) * 2007-06-05 2012-04-18 中兴通讯股份有限公司 移动通信系统中跟踪测量报告的方法及其测量装置
JP5166534B2 (ja) 2007-09-11 2013-03-21 テレフオンアクチーボラゲット エル エム エリクソン（パブル） Ｒｂｓ処理能力に基づく測定制御
WO2011120585A1 (fr) * 2010-04-01 2011-10-06 Nokia Siemens Networks Oy Rapport de mesure dans des systèmes de communication
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CN102469488B (zh) * 2010-11-09 2016-03-02 中兴通讯股份有限公司 一种测量结果过滤方法、装置及终端

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WO2008095043A2 (fr) 2007-01-30 2008-08-07 Qualcomm Incorporated Contraintes de canaux de commande dans des communications sans fil
WO2008095043A3 (fr) * 2007-01-30 2008-10-23 Qualcomm Inc Contraintes de canaux de commande dans des communications sans fil
KR101169842B1 (ko) * 2007-01-30 2012-07-30 콸콤 인코포레이티드 무선 통신에서의 제어 채널 제약들
US8743774B2 (en) 2007-01-30 2014-06-03 Qualcomm Incorporated Resource requests for a wireless communication system
US8892108B2 (en) 2007-01-30 2014-11-18 Qualcomm Incorporated Control channel constraints in wireless communications
US10070332B2 (en) 2007-06-21 2018-09-04 Interdigital Technology Corporation Method and apparatus for measurement reporting and event-triggered periodic measurement reporting in an evolved universal terrestrial radio access network
US20180077616A1 (en) * 2015-06-01 2018-03-15 Telefonaktiebolaget Lm Ericsson (Publ) Methods used in cluster manager, radio node and control node, and associated devices

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CN1711795A (zh) 2005-12-21
GB0225979D0 (en) 2002-12-11
GB2395398A (en) 2004-05-19
EP1563703A1 (fr) 2005-08-17
CN100553376C (zh) 2009-10-21
AU2003283440A1 (en) 2004-06-07
GB2395398B (en) 2007-05-23

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