EP2774408A1 - Signalisation de réseau à terminal pour la commande de mesures inter-fréquences - Google Patents

Signalisation de réseau à terminal pour la commande de mesures inter-fréquences

Info

Publication number
EP2774408A1
EP2774408A1 EP12786892.5A EP12786892A EP2774408A1 EP 2774408 A1 EP2774408 A1 EP 2774408A1 EP 12786892 A EP12786892 A EP 12786892A EP 2774408 A1 EP2774408 A1 EP 2774408A1
Authority
EP
European Patent Office
Prior art keywords
cells
information
frequency
measurements
cell
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP12786892.5A
Other languages
German (de)
English (en)
Inventor
Karol Drazynski
Guillaume DECARREAU
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Solutions and Networks Oy
Original Assignee
Nokia Solutions and Networks 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.)
Filing date
Publication date
Application filed by Nokia Solutions and Networks Oy filed Critical Nokia Solutions and Networks Oy
Priority to EP12786892.5A priority Critical patent/EP2774408A1/fr
Priority claimed from PCT/EP2012/071652 external-priority patent/WO2013064591A1/fr
Publication of EP2774408A1 publication Critical patent/EP2774408A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H04W36/0094—Definition of hand-off measurement parameters

Definitions

  • Some embodiments of the present invention relate to a method and apparatus and in particular but not exclusively to a method and apparatus useful for cell measurement reporting.
  • a commun ication system can be seen as a facility that enables commun ication sessions between two or more entities such as user terminals, base stations and/or other nodes by provid ing carriers between the various entities involved in the communications path .
  • a communication system can be provided for example by means of a commun ication network and one or more compatible commun ication devices.
  • the communications may comprise, for example, communication of data for carrying commun ications such as voice, electron ic mail (email), text message, multimed ia and/or content data and so on .
  • Non-limiting examples of services provided include two-way or multi-way calls, data communication or multimedia services and access to a data network system, such as the Internet.
  • wireless communication system at least a part of communications between at least two stations occurs over a wireless link.
  • wireless systems include publ ic land mobile networks (PLMN), satell ite based communication systems and different wireless local networks, for example wireless local area networks (WLAN).
  • PLMN publ ic land mobile networks
  • WLAN wireless local area networks
  • the wireless systems can typically be divided into cells, and are therefore often referred to as cellular systems.
  • a user can access the com m u n ication system by mea ns of an appropriate communication device or terminal.
  • a communication device of a user is often referred to as user equipment (UE).
  • UE user equipment
  • a communication device is provided with an appropriate sig nal receiving and transm itting apparatus for enabl ing com mun ications, for example enabling access to a communication network or communications directly with other users.
  • the commun ication device may access a carrier provided by a station , for exa m pl e a base station of a cel l , and tra nsm it and/or rece ive communications on the carrier.
  • the communication system and associated devices typically operate in accordance with a g iven standard or specification wh ich sets out what the various entities associated with the system are permitted to do and how that should be achieved .
  • Communication protocols and/or parameters which shall be used for the connection are also typically defined.
  • An example of attempts to solve the problems associated with the increased demands for capacity is an architecture that is known as the long- term evolution (LTE) of the Universal Mobile Telecommunications System (UMTS) radio-access technology.
  • LTE is being standardized by the 3 rd Generation Partnership Project (3GPP).
  • 3GPP 3 rd Generation Partnership Project
  • the various development stages of the 3GPP LTE specifications are referred to as releases.
  • a further development of the LTE is referred to as LTE-Advanced (LTE-A).
  • HNB Home NodeB
  • HeNB home evolved node Bs
  • Femto-cells may have different access modes: closed, hybrid and open. If the femto- cell has an open mode, the cell is freely available for user equipment. If the femto- cell has a closed subscriber list, this means that only certain user equ ipment are permitted to use the femto-cell .
  • a hybrid femto-cell has characteristics of both an open and closed femto cell.
  • a method comprising : receiving information , from wh ich information one or more cells for wh ich one or more measurements are to be reported can be determined; causing, responsive to said information, one or more cells on a different frequency to an active frequency and for which one or more measurements are to be reported to be distinguished from one or more cells on said different frequency for which no measurements are to be reported; and causing a report to be sent for said one or more cells on said different frequency for which measurements are to be reported.
  • a method comprising : receiving information indicating a connection with an active cell is to be released, a different frequency to an active frequency of said active cell and/or a different radio access technology to that of said active cell , and one or more cells on said d ifferent frequency and/or different radio access technology to which a user equipment is not to connect can be determined; releasing said connection with said active cell; and finding a new cell on said different frequency and/or different radio access technology, rejecting any cell on said different frequency and/or different radio access technology to which said user equipment is not to connect.
  • an apparatus comprising: at least one processor and at least one memory including computer program code, wherein the at least one memory and computer program code are configured to, with the at least one processor, cause the apparatus to: cause, responsive to received information, one or more cells on a different frequency to an active frequency and for which one or more measurements are to be reported to be distinguished from one or more cells on said different frequency for which no measurements are to be reported; and cause a report to be sent for said one or more cells on said different frequency for which measurements are to be reported.
  • an apparatus comprising: at least one processor and at least one memory including computer program code, wherein the at least one memory and computer program code are configured to, with the at least one processor, cause the apparatus to: receive information indicating a connection with an active cell is to be released, a different frequency to an active frequency of said active cell and/or a different radio access technology to that of said active cell, and one or more cells on said different frequency and/or d ifferent radio access technology to which a user equipment is not to connect can be determined; release said connection with said active cell; and find a new cell on said different frequency and/or different rad io access tech nology, rejecting any cel l on sa id d ifferent frequency and/or different radio access technology to which said user equipment is not to connect.
  • Figure 1 shows a schematic diagram of a network according to some embodiments
  • Figure 2 shows a schematic diagram of a mobile communication device according to some embodiments
  • Figure 3 shows a schematic diagram of a control apparatus according to some embodiments
  • Figure 4 shows a first signalling flow in an embodiment
  • Figure 5 shows a second signalling flow
  • Figure 6 shows a third signalling flow.
  • a mobile communication device or user equipment 101 , 102, 103, 104 is typically provided wireless access via at least one base station or similar wireless transmitter and/or receiver node of an access system .
  • FIG 1 three neighbouring and overlapping access systems or radio service areas 1 00, 1 1 0 and 1 20 are shown being provided by base stations 105, 106, and 108.
  • An access system can be provided by a cell of a cellular system or another system enabling a communication device to access a communication system .
  • a base station site 1 05, 106, 108 can provide one or more cells.
  • a base station can also provide a plurality of sectors, for example three radio sectors, each sector providing a cell or a subarea of a cell. All sectors within a cell can be served by the same base station.
  • a radio link within a sector can be identified by a single logical identification belonging to that sector.
  • a base station can provide one or more radio service areas.
  • Each mobile communication device 101 , 102, 103, 104, and base station 105, 106, and 1 08 may have one or more radio channels open at the same time and may send signals to and/or receive signals from more than one source.
  • Base stations 1 05, 1 06, 108 may be controlled by a radio network controller RNC 1 1 2 so as to enable operation thereof and management of mobile communication devices 1 01 , 102, 103, 1 04 in communication with the base stations 105, 106, 1 08.
  • the function of the RNC may be distributed between a plurality of entities.
  • each base station 105, 106 and 108 can have at least part of the RNC function.
  • the cell borders or edges are schematically shown for illustration purposes only in Figure 1 . It shall be understood that the sizes and shapes of the cells or other radio service areas may vary considerably from the similarly sized omni-directional shapes of Figure 1 .
  • Figure 1 depicts two wide area base stations 1 05, 1 06, which can be macro-NBs (node B) 105, 106.
  • the macro-NBs 105, 1 06 transmit and receive data over the entire coverage of the cells 100 and 1 1 0 respectively.
  • Figure 1 also shows a smaller base station or access point 108.
  • the coverage of the smaller base station 108 may generally be smaller than the coverage of the wide area base stations 1 05, 106.
  • the coverage provided by the smaller node 1 08 overlap with the coverage provided by the macro-NBs 105, 106.
  • the smaller node can be pico NB or a femto NB.
  • a femto node B may be connected to a HNodeB Gateway which in turn is connected to RNC.
  • RNC Radio Network Controller
  • the communication devices 101, 102, 103, 104 can access the communication system based on various access techniques, such as code division multiple access (CDMA), or wideband CDMA (WCDMA).
  • CDMA code division multiple access
  • WCDMA wideband CDMA
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • IFDMA interleaved frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SDMA space division multiple access
  • appropriate access nodes are a base station of a cellular system, for example what is known as NodeB (NB) in the vocabulary of the 3GPP specifications.
  • NB NodeB
  • the LTE employs a mobile architecture known as the Evolved Universal Terrestrial Radio Access Network (E-UTRAN).
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • Base stations of such systems are known as evolved Node Bs (eNBs) and may provide E-UTRAN features such as user plane Radio Link Control/Medium Access Control/Physical layer protocol (RLC/MAC/PHY) and control plane Radio Resource Control (RRC) protocol terminations towards the user devices.
  • E-UTRAN features such as user plane Radio Link Control/Medium Access Control/Physical layer protocol (RLC/MAC/PHY) and control plane Radio Resource Control (RRC) protocol terminations towards the user devices.
  • RLC/MAC/PHY Radio Link Control/Medium Access Control/Physical layer protocol
  • RRC Radio Resource Control
  • Other examples of radio access system include those provided by base stations of systems that are based on technologies such as wireless local area network (WLAN) and/or WiMax (Worldwide Interoperability for Microwave Access).
  • WLAN wireless local area network
  • WiMax Worldwide Interoperability for Microwave Access
  • FIG. 2 shows a schematic, partially sectioned view of a communication device 101 that a user can use for communication.
  • the communication device may be a mobile communication device.
  • a communication device is often referred to as user equipment (UE) or terminal.
  • An appropriate communication device may be provided by any device capable of sending and receiving radio signals.
  • Non-limiting examples include a mobile station (MS) such as a mobile phone or what is known as a 'smart phone', a portable computer provided with a wireless interface card or other wireless interface facility, personal data assistant (PDA) provided with wireless communication capabilities, or any combinations of these or the like.
  • MS mobile station
  • PDA personal data assistant
  • a communication device may provide, for example, communication of data for carrying communications such as voice, electronic mail (email), text message, multimedia and so on. Users may thus be offered and provided numerous services via their communication devices. Non-limiting examples of these services include two-way or multi-way calls, data communication or multimedia services or simply an access to a data communications network system, such as the Internet. A user may also be provided broadcast or multicast data. Non-limiting examples of the content include downloads, television and radio programs, videos, advertisements, various alerts and other information.
  • the user equ ipment 1 01 may receive s ign al s over an a ir i nterface 207 via appropriate apparatus for receiving and may transmit signals via appropriate apparatus for transmitting radio signals.
  • transceiver apparatus is designated schematically by block 206.
  • the transceiver apparatus 206 may be provided for example by means of a radio part and associated antenna arrangement.
  • the antenna arrangement may be arranged internally or externally to the mobile device.
  • the user equipment is also typically provided with at least one data processing entity 201 , at least one memory 202 and other possible com ponents 203 for use in software and hardware aided execution of tasks it is designed to perform, including control of access to and com m u n ication s with access system s a nd oth er communication devices.
  • the data processing, storage and other relevant control apparatus can be provided on an appropriate circuit board and/or in chipsets. This feature is denoted by reference 204.
  • a measurement unit which is adapted to evaluate received measurement requests, to perform the measurements according to the available information, which includes preparing measurements, perform ing measurements eg ., on cells or carriers or freq uencies, eval uating measu red signals, preparing measurement resu lts, transmitting measurement report.
  • the user may control the operation of the user equipment by means of a suitable user interface such as a key pad 205, voice commands, touch sensitive screen or pad, combinations thereof or the like.
  • a display 208, a speaker and a microphone can be also provided.
  • a user equipment may comprise appropriate connectors (either wired or wireless) to other devices and/or for connecting external accessories, for example hands-free equipment, thereto.
  • Figure 3 shows an example of the RNC 1 12.
  • the RNC 1 12 comprises at least one memory 301 , at least one data processing unit 302, 303 and an input/output interface 304. Via the interface the RNC can be coupled a plurality of base stations.
  • the RNC 1 12 can be configured to execute an appropriate software code to provide control functions.
  • Heterogeneous networks have been proposed.
  • a heterogeneous network has a macro cellular network which may be overlaid with one or more micro, pico and/or femto cells.
  • the femto cells may be home femto cells which may be subject to unplanned deployment. Efficient interference management schemes are therefore desirable for the optimisation of HetNet cases.
  • Embodiments may be used in LTE, WCDMA systems or any other suitable systems.
  • NCL Neighbour cell lists
  • Embodiments may be used with detected set reporting (DSR) for an inter-frequency sce n a rio wh i ch i s som eti m es refe rred to as i nter-frequency detected set measurements for UMTS.
  • DSR detected set reporting
  • CSG closed subscriber group
  • MCM measurement configuration message
  • inter-frequency CSG and/or hybrid cells may be added to a virtual active set.
  • the quality of these cells may be reported in a measurement report together with the other types of cells.
  • a user equipment may not know which of the cells located on the non-serving frequency are CSG or hybrid cells.
  • a network deploying CSG or hybrid cells can broadcast a system information block.
  • the system information block (SIB) may, in the 3GPP standard be SIB3 or SIB1 I bis block.
  • SIB a CSG PSC (primary scrambling code) split range may be provided.
  • the PSC information allows the user equipment to identify cells.
  • the PSC split information can indicate a list or range of PSCs assigned to cells operating in the frequency.
  • the PSC split information which is broadcast may, for example in some embodiments be valid for 24 hours on the PLMN and UARFCN (UMTS absolute radio frequency channel number) on which it was received.
  • CELL_DCH is a RRC Connected UE state where the terminal is assigned a dedicated (DCH) channel. This implies that the terminal performs handovers and measurements as ordered by the network.
  • the UE will not know which PSC values represent CSG and/or hybrid cells. Accordingly, the proposed inter-frequency detected set measurements may not be effective in the discovery of small cells. From a different perspective, an operator may like to exclude certain types of cells, such as CSG and/or hybrid cells from it being discovered and reported by a particular user equipment. This may be because the particular user equipment does not have access rights to those CSG and/or hybrid cells.
  • the inter-frequency detected set measurements will be performed on a g iven non-serving carrier and the user equipment will not have any means to distinguish CSG and/or hybrid cells.
  • the number of cells reported by the user equipment may be high . This may lead to the user equipment reporting on cells to which the user equipment cannot attach and this may prevent the report of those cells which are actually available for mobility.
  • the message sent to the user equipment in UTRAN will not contain explicit LTE cells but only a frequency.
  • the message sent may be, for example, the RRC (radio resource control) connection release message.
  • information on PSC split ranges for different types of cells on non-serving frequencies may be provided.
  • the information may be provided in one or more information elements.
  • the information element or information may be provided in any suitable message.
  • the message may be a measurement control message wh ich perm its CSG/hybrid/pico/micro inter-frequency detected set measurements.
  • the PSC split ranges may refer to different types of cells such as CSG cells, hybrid cells, pico cells or CSG cells shared by other operators on their relevant carriers.
  • the user equipment is configured to perform inter-frequency detected set measurements to discover, dependent on their configuration, CSG, hybrid and/or pico/micro cells on non-serving frequencies. This may also permit a user equipment to discover femto-cells shared by operators where the PSC and UARFSN range is different from the user equipment's own network. In this case, the PLMN may be the same.
  • the information provided to the user equipment may comprise the PSC values for cells which should not be reported and measured during inter-frequency detected set measurements. This information may be defined in terms of those values which should not be used or those values which can be used. This information can be used to prevent a user equipment from reporting CSG and/or hybrid cells from a non- serving carrier if the user equipment does not have access rights for those cells.
  • the PSC split information may be provided for one or more different frequencies during handover or a redirection order.
  • a user equipment is provided in a network and is served by a serving node B on a first frequency l .
  • a serving node B In the neighbourhood is a CSG cell on a second frequency f2.
  • a third frequency f3 is provided by a hybrid cell.
  • a pico cell is provided on a fourth frequency f4. These cells are neighbouring cells.
  • the RNC is configured to control each of these cells or at least have information for those cells which are not directly controlled by itself but which maybe is controlled by another RNC.
  • the user equipment has a connection established via the serving node B on frequency f1 .
  • the serving node B will provide the connection means between the user equipment and RNC when a connection has been established with the user equipment.
  • the RNC will send a message, in step S2 to the user equipment.
  • This message will be sent via the serving node B on the first (active/serving) frequency.
  • the message is a radio resource control message.
  • This message may be a measurement configuration message which contains the indication to start inter-frequency detected set measurements.
  • the information which is sent by the RNC contains PSC ranges at which the UE should look while performing inter-frequency detected set measurements. In some embod iments, the information which is sent by the RNC conta ins PSC ranges at which the UE should not look wh ile performing inter- frequency detected set measurements. In another embodiment the RNC may sent information to the UE containing PSC ranges (values) on which the UE should and should not perform inter-frequency detected set measurements. The RNC is able to configure the user equipment to perform inter-frequency detected set measurements according to the relevant PSC split information to discover or omit particular types of cells.
  • inter-frequency detected set measurements are the measurements carried out by the user equipment on frequencies different to that used by the serving node B.
  • the user equipment is instructed by the inter-frequency detected set measurements message to carry out measurements on frequencies other than the first frequency f1 .
  • This message will also include information indicating which types of cells (denoted by PSC range) e.g. CSG cells on the second frequency f2 can be measured, which types of cells (denoted by PSC range) e.g . hybrid cells on the frequency f3 can be measured and which types of cells (denoted by PSC range) e.g . pico cells on the fourth frequency f4 can be measured.
  • this information can positively identify those cells which can be measured or ind icate those cells wh ich shou ld not be measured.
  • information on the associated frequency may be provided .
  • the information may be provided in the form of the PSC number.
  • the UE is given the non-serving frequency on which the U E should perform inter- frequency detected set measurements and the PSC values which it should/should not measure. Which types of cells (CSG/hybrid/pico/etc) are given a particular CSG range may be implementation specific and may be different for each of the used frequencies.
  • the user equ ipment will start the inter-frequency detected set measurements for the relevant cell types in dependence on the received information from the RNC.
  • step S4 the user equipment is configured to start performing inter-frequency detected set measurements on the second frequency 12 looking at the CSG cells which are allowed based on the received information from the RNC.
  • step S5 the measurements are performed and then will be stored in the user equipment.
  • Step S6 the user equipment is configured to start performing inter-frequency detected set measurements on the third frequency f3, looking at the relevant hybrid cells. This is again based on the information received from the RNC.
  • Step S7 schematically illustrates the measurement process and storing of results.
  • step S8 the user equipment performs inter-frequency detected set measurements on the fourth frequency f4l looking at the permitted pico cells based on the information received from the RNC.
  • step S9 schematically shows the measurements performed by the user equipment and storage of results by the user equipment.
  • step S10 the user equipment will sent via the serving node B to the RNC, an RRC measurement report message containing the results of the inter-frequency detected set measurements on the configured cells.
  • the step monitoring of the different cells can of course take place in a different order to that shown in Figure 4.
  • the user equipment may be able to carry out measurements on two or more of the frequencies at the same time.
  • the message which is sent via the serving node B to the RNC may be any other suitable message.
  • Figure 5 illustrates a second scenario.
  • the serving cel l is on frequency f1
  • the CSG cell is on a second frequency f2
  • a hybrid cell is also on the frequency f2.
  • the user equipment is prevented by the RNC from perform ing on inter-frequency detected set measurements for certain types of cells on the non-serving frequency based on the provided PSC split.
  • Step T1 is the same as step S1 described in Figure 4 and will not be described again.
  • Step T2 is similar to S2. However, in th is message, the RNC instructs the user equ ipment to start the inter-frequency detected set measurements.
  • the RNC ind icates in th is example that the user equipment is blocked from performing measurements on the CSG cell on f2 but is permitted to carry out measurements on the hybrid cell on the frequency f2.
  • the user equipment is configured to perform an inter-frequency detected set measu rement on the second freq uency in accordance with the provided configuration on the CSG cell .
  • step T4 The measurements made are schematically represented by step T4.
  • step T5 the user equipment determines that the discovered cell has a PSC value contained in the blocked PSC range. The cel l will therefore not be reported.
  • step T6 inter-frequency detected set measurements on the second frequency f2 are carried out in respect of the hybrid cell.
  • step T7 the user equipment notices that the measured cells PSC value is within the configured range. As a result, the cell will be reported.
  • Step T8 is similar to step S10 of Figure 4 and will not be described again.
  • the RNC is able to customise offloading the user equipment. This allows the network operator greater control over the network. For example, some user equipments without access rights to a CSG or hybrid cell may instead be offloaded to a pico or, for example, open access femto-cell. Embodiments may allow the network operator to control the d istribution of user equipment. For example, it may be advantageous to keep the user equipment attached to closed or hybrid femto-cells where the user equipment is permitted access to those cells and to keep the open access cells available for other user equipment.
  • Embodiments may be used where there are more and more small cells deployed on different carriers.
  • the NCL is relatively short and it may not be possible to list all of those cells in such a NCL.
  • Embodiments may allow the control of the network to offload terminals to, for example, smaller cells more quickly.
  • the user equipment is connected to a serving cell on a first frequency f1 (UTRAN Cell).
  • a LTE CSG cell on a second frequency f2 and a macro LTE cell also on the second frequency f2 is provided.
  • a user equipment may be handed over or redirected from one rad io access technology RAT to a different radio access technology. This is referred to inter RAT reselection.
  • the radio network controller sends via the serving node B a release connection message to the user equipment. This may be a radio resource control message. The user equipment is instructed to change to the second frequency f2.
  • the message is also provided with CSG's PCI split information relating to the second frequency.
  • PCI is the similar to PSC but for an LTE Cell . It is the Physical Cell ID of the cell.
  • the information may indicate wh ich cells the user equ ipment can connect and/or not connect. Alternatively the information may be such that the UE is able to determine which cells the UE can connect and/or not connect.
  • step A2 the radio resource control connection release is complete.
  • step A3 the user equipment attempts to find a cell on the frequency f2.
  • the user equipment finds the CSG cell on the second frequency f2.
  • the user equipment knows that it is not permitted to connect to that cell.
  • step A4 the user equ ipment finds the macro cell on the second frequency f2. Based on the information which the user equipment has received in step A1 , the user equipment determines that it is permitted to make a connection to that macro cell and accordingly begins the connection.
  • step A5 the user equipment will make an RRC connection request to the macro cell .
  • Some methods may provide measurement parameters from a network node to the user equipment.
  • the network node may be a RNC or any other suitable node or nodes.
  • the measurement parameters may comprise PSC split information on a further frequency.
  • the measurement parameters may ta ke a d ifferent form .
  • Th e measurement parameters may indicate which one or more cells or which one or more cell types are to be mon itored.
  • the information may include impl icitly or explicitly the frequency to be monitored.
  • the user equipment may use the information to control which cells are reported and/or on which measurements are performed.
  • the user equipment may be configured to send one or more measurement reports including cells which are selected in dependence on the information received from, for example, the network node.
  • Some embodiments may allow the user equipment to detect different types of cells and perform or exclude measurements for specified cell types or cells.
  • Embodiments may allow a network operator to control measurement reporting in the network.
  • Some embodiments may permit the focusing of user equipment to certain cell types.
  • Some embodiments may improve network reliability by improving mobility decisions in the connected mode of the user equipment. This may be because cells which are not available to the user equipment can be excluded from the handover decision where handover would in any case fail. Delay of handover may be undesirable as this may risk connection loss and/or degrade the quality. Some embodiments may permit the disadvantage of the current l imitation of 32 neighbour cells listed in the NCL to be avoided. Th is may be avoided in some embodiments by allowing detected set reporting for other frequencies.
  • notification of the PSC split applicable in the other frequency to the user equipment may improve measurement performance by causing the user equipment to focus on permitted cells. In some embodiments this may be achieved by causing the user equipment to focus on cells operating with the indicated PSC values and exclude extensive measurements on cells which are not of interest for mobility decisions because, for example, the user equipment would not be permitted access to those cells.
  • Embodiments may be used in any su itable situation for example, be used where there are a number of smaller cells, such as femto, macro and/or pico cells.
  • Embodiments have been described as using PSC split information to control which cells are monitored/not mon itored and/or handed over to/not handed over to. It should be appreciated that this information is one example and in alternative embodiments, different information may be provided.
  • the information may be dependent on the standard used with some embodiments.
  • this mechanism may be used by the network operator to assert control over which cells are used by a user equipment. This may be for network planning issues or any other suitable issue. Accordingly, the cells which the user equipment is stopped from monitoring may be open access cells, in some embodiments.
  • Figures 4 to 6 not only show the signal flow but also illustrate one or more method steps performed by the user equipment, base stations and RNC. Various different embodiments have been described. It should be appreciated that one or more embodiments may be used at least partially in combination.
  • one or more of the method steps may be combined into a single step. In some embodiments, one or more of the method steps may be changed in terms of order. I n some embod i ments , one or more steps may be om itted . I n som e embodiments, one or more additional steps may be included. One or more of the steps of any of the methods may be implemented using a respective arrangement.
  • the respective arrangement may comprise circuitry and/or may be performed by one or more processors run computer code.
  • One or more arrangements may be provided by common circuitry and/or the same one or more processors as used by another arrangement. Where one or more processors are provided, these processors may operate in conjunction with one or more memories.
  • the required data processing apparatus and functions of a base station apparatus, user eq u i pm ent and RNC may be provided by mea ns of one or more data processors. These may perform one or more of the method steps of a respective method.
  • the data processors may be of any type suitable to the local technical environment, and may include one or more of general pu rpose computers, special pu rpose computers, microprocessors, digital signal processors (DSPs), application specific integrated circuits (ASIC), gate level circuits and processors based on multi core processor arch itecture, as non limiting examples.
  • the data processing may be distributed across several data processing modules.
  • a data processor may be provided by means of, for example, at least one chip.
  • the memory or memories may be of any type suitable to the local technical environment and may be implemented using any su itable 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 various embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects of embodiments may be im plemented in hardware, wh ile other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although embodiments are not limited thereto. While various aspects of the embodiments may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described here in may be i m plemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof. Some embodiments may be implemented by computer software executable by one or more data processors in conjunction with one or more memories of a base station, UE or RNC.
  • One or more steps of a method of an embodiment may be performed when computer executable instructions are run on one or more processors.
  • any blocks of the logic flow as in the Figures may represent program steps, or interconnected logic circuits, blocks and functions, or a combination of program steps and logic circuits, blocks and functions.
  • the software or computer executable instructions may be stored on such physical med ia as memory chips, or memory blocks implemented with in the processor, magnetic media such as hard d isk or floppy disks, and optical media such as for example DVD and the data variants thereof, CD.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne des mesures inter-fréquences sur des cellules qui ont une fréquence différente de la fréquence active. L'invention concerne en particulier un élément de travail de TSG RAN appelé "mesures d'inter-fréquences détectées pour UMTS (IDT)". Selon des inventions courantes, il est possible de signaler à l'équipement utilisateur (UE) une séparation PSC pour des cellules CSG dans la fréquence utilisée, dans SIB. Ceci pose un problème, à savoir, le terminal ne peut savoir lesquelles des cellules localisées sur la fréquences n'assurant pas la desserte sont des cellules CSG ou hybrides. Généralement, un réseau déployant des cellules CSG/ hybrides peut émettre dans SIB3 ou SIB11bis une plage de séparation CSG PSC qui, conformément à 25.331, section 8.6.2.4, est valable pendant 24 heures, sur les PLMN et UARFCN de réception. Ceci s'applique toutefois seulement à des nouvelles sélections d'état non CELL_DCH et n'est donc pas applicable au mode connecté (CELL_DCH). Par conséquent, partant de l'hypothèse qu'un UE est initialement resté sur une fréquence et a acquis l'information de séparation PSC pour cette fréquence, en se mettant en mode connecté et en réalisant des mesures détectées sur des fréquences n'assurant pas la desserte, l'UE ne sait pas quelles valeurs PSC représentent des cellules CSG ou des cellules hybrides. La présente invention apporte une solution à ce problème en ce que le réseau (RNC) envoie des signaux (RRC: message de configuration de mesure) à l'UE lui donnant l'information selon laquelle l'UE peut distinguer des cellules sur une fréquence n'assurant pas la desserte pour savoir si des mesures doivent leur être rapportées ou si elle peuvent y être connectées, cette information se présentant en particulier sous forme d'une séparation PSC.
EP12786892.5A 2011-11-03 2012-11-01 Signalisation de réseau à terminal pour la commande de mesures inter-fréquences Withdrawn EP2774408A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12786892.5A EP2774408A1 (fr) 2011-11-03 2012-11-01 Signalisation de réseau à terminal pour la commande de mesures inter-fréquences

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP2011069373 2011-11-03
EP12786892.5A EP2774408A1 (fr) 2011-11-03 2012-11-01 Signalisation de réseau à terminal pour la commande de mesures inter-fréquences
PCT/EP2012/071652 WO2013064591A1 (fr) 2011-11-03 2012-11-01 Signalisation de réseau à terminal pour la commande de mesures inter-fréquences

Publications (1)

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EP2774408A1 true EP2774408A1 (fr) 2014-09-10

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Non-Patent Citations (2)

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