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
  • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
  • H04W36/0085—Hand-off measurements

Definitions

• the present invention generally relates to mobile radio systems.
• mobile radio systems are subject to standardization, and for a complete description of these systems reference may be made to the corresponding standards issued by the corresponding standardization bodies.
• the general architecture of a mobile radio system such as in particular a UMTS type system ("Universal Mobile Telecommunications System") is recalled in FIG.
• the system comprises a mobile radio network communicating with mobile terminals or UE ("User Equipment”) and with external networks (not specifically illustrated).
• UE User Equipment
• the mobile radio network comprises: a radio access network, or UTRAN ("UMTS Terrestrial Radio Access
• Network a core network
• CN Core Network
• the UTRAN includes base stations or "Node B", and base station controllers or radio network controllers (RNCs).
• the UTRAN is in relation, on the one hand, with the mobile terminals UE, via an interface called “Uu” interface (or radio interface), and on the other hand with the CN via an interface called “read” interface.
• the Node B base stations communicate with the RNC base station controllers via an interface called a "lub” interface, and an interface called “lur” may further be provided between RNCs.
• Radio Resource Control Radio Resource Control
• 3GPP TS 25.331 defining the RRC protocol
• 3GPP 3rd Generation Partnership Project
• Mobility management algorithms have been defined at the UTRAN level, based on a system of states called RRC states and transitions between these states.
• information about the location of the UE a mode called “connected mode”, in which there is a connection between the UE and the UTRAN, and the UTRAN has information about the location of the UE.
• a state called “CeII DCH” (where DCH is used for "Dedicated Channel"), in which the location of the UE is known from the UTRAN at level of one or more cells called active cells, the UE performing radio measurements and reporting to the network the results of these measurements
• a state called “CeII FACH” (where FACH is used for "Forward Access Channel"), in where the location of the UE is known to the UTRAN at a cell, the UE performing radio measurements and performing cell reselections itself on the basis of the results of these measurements and informing the network at the same time.
• URA is used for "UTRAN Registration Area”
• PCH is used for "Paging Channel”
• the UE can be joined only by means of a paging procedure, and the location of the terminal is known at a set of cells or URAs, the UE performing radio measurements and carrying out even cell resections based on the results of these measurements and informing the network through a URA update procedure.
• UTRAN network control
• Various radio measurement control information can thus be transmitted to the UE by the UTRAN.
• this information can be transmitted by broadcasting system information and / or by transmitting a dedicated signaling message called "Measurement Control".
• the type of measurement there are, in particular, the type of measurement, and parameters related to the type of measurement.
• the types of measurements there are, in particular: intra-frequency measurements (or measurements carried out on the same frequency as that used by the active cell or cells) of inter-frequency measurements (or measurements made on a frequency different from that used) by the active cell or cells) radio access inter-technology measurements, or inter-RAT, where RAT is used for "Radio Access Technology” (or measurements made on cells of another system, such as for example the GSM ("Global System for Mobile Communications"), using radio access technology different from that used by the active cell (s), upstream traffic volume measurements (or "uplink”), position measurements from the mobile station, - ... etc.
• GSM Global System for Mobile Communications
• the parameters related to the type of measurement there are, in particular, the objects on which measurements are to be made (such as cells, etc.), the criterion for reporting the results of these measurements, etc.
• the use of the "Measurement Control" message, for types of measurements other than traffic volume measurements or position measurements, is in fact specified only for a UE. in the state CeII DCH.
• control information contained in in system information (called “System Information Block type 1 1” and "System information Block type 12") broadcast by the network to all UEs in the same cell.
• the radio measurement control information contained in this system information includes a list of cells to be measured, and a parameter called "FACH measurement occasion info" defining the occurrences of measurements.
• the current state of the standard for an EU in a state other than the CeII DCH state, is not optimal, or is problematic, which for simplicity may be exposed to way of an example.
• a frequency for cells supporting a certain functionality such as for example HSDPA ("High Speed Downlink Packet Access”)
• HSDPA High Speed Downlink Packet Access
• a UE supporting the HSDPA functionality in the CeII FACH state is considered, for example because a FACH ("Forward Access CHAnnel") transport channel is allocated to this UE for packet data transmission, to a flow momentarily relatively low.
• FACH Forward Access CHAnnel
• the UE if the UE then goes into the state CeII DCH, for example because a transport channel is then allocated to this UE for the transmission of packet data, at a momentarily relatively high rate, the UE will not be able to allocate an HSDSCH (High Speed Downlink Shared CHannel) transport channel in order to receive this data at a relatively high rate.
• the EU shall be satisfied with a connection on a DCH (Dedicated Channel) type transport channel with a bit rate less than one connection on an HSDSCH transport channel.
• the transfer delay may then be increased, or in other words the quality of service may be degraded, in a manner not acceptable to the user.
• a UE that does not support the HSDPA functionality may select an HSDPA cell, resulting in inefficient use of resources in the system, or inefficient operation of the system for the operator.
• the present invention is intended in particular to solve all or part of these problems, and / or to avoid all or part of these disadvantages. More generally, one of the aims of the present invention is to improve the performance and quality of service in these systems.
• One of the objects of the present invention is a method for controlling radio measurements in a cellular mobile radio system, for a mobile station in connected mode and in a mobility management state in which the mobile station makes re-selections of cell, process comprising steps of:
• a dedicated radio measurement control message said message including radio measurement control information, said information including measurement type control information, said type of measurement being selected from a group including Intra-frequency, inter-frequency, inter-radio access technology measurements,
• Another object of the present invention is a mobile station, comprising means for implementing such a method.
• Another object of the present invention is a mobile radio network entity (especially a radio network controller, or RNC) for implementing such a method.
• a mobile radio network entity especially a radio network controller, or RNC
• FIG. 1 is intended to recall the general architecture of a cellular mobile radio system such as in particular UMTS
• FIG. 2 is intended to illustrate an exemplary method according to the invention
• FIG. 3 is a diagram for illustrating an example of means that can be used in a mobile station, for implementing a method according to the present invention.
• the invention is applicable in particular to the case of UMTS; in what follows, reference will be made more particularly, by way of example, to UMTS.
• FIG. 2 illustrates an exemplary method according to the invention.
• the method according to the invention comprises, for the control of radio measurements, for a mobile station in connected mode and in a mobility management state in which the mobile station makes cell re-selections:
• a step 1 of reception by the mobile station of a dedicated radio measurement control message said message including radio measurement control information, said information including measurement type control information, said type of measurement being selected from a group comprising intra-frequency, inter-frequency, inter-radio access,
• Said radio measurement control dedicated message corresponds in particular to the "Measurement Control" message transmitted to the UE by the UTRAN (more particularly by a UTRAN entity corresponding to a radio network controller or RNC) according to the RRC protocol ( "Radio Resource Control") for UMTS.
• different frequencies may correspond to frequencies allocated to different types of cells, supporting different types of functionalities or services.
• different frequencies may be allocated to cells supporting HSDPA ("High Speed Downlink Packet Access”) functionality, and to cells that do not support this feature.
• HSDPA High Speed Downlink Packet Access
• step 1 it is verified in a preliminary step 1 'that the mobile station (or UE) is in connected mode and in a mobility management state in which it is making re-selections of cell. If the UE is in a mobility management state corresponding to the CeII FACH state, steps 1, 2 and 3 can be implemented directly.
• a preliminary step, denoted 1 ", of transition from the state CeII PCH or URA PCH to the state CeII FACH is all This transition can be carried out in one of two ways:
• the network initiates a paging procedure.
• the UE performs cell re-selections, based on radio measurement results.
• FIG. 2 there is also illustrated:
• step 4 of cell re-selection by the mobile station, on the basis of radio measurement results obtained in step 3.
• said radio measurement control dedicated message transmitted by the network to a mobile station in connected mode and in a mobility management state (such as the CeII FACH state, or CeII PCH, or URA PCH) in which the mobile station makes cell re-selections, advantageously contains, with respect to a dedicated radio measurement control message transmitted by the network to a mobile station in connected mode and in a state of mobility management such as the state CeII DCH, control information of occurrences of measurements.
• a mobility management state such as the CeII FACH state, or CeII PCH, or URA PCH
• This measurement occurrence control information can be of the same type as the "FACH measurement occasion info" control information transmitted in system information, as recalled in the introduction. Furthermore, according to another aspect of the invention, a decision is made by the network to transmit a dedicated radio measurement control message, to a mobile station in connected mode and in a mobility management state in which the mobile station performs cell re-selections, based on at least one of several criteria including in particular the type of services or functionalities supported by the mobile station and / or by the active cell (s) and / or by one or more neighboring cells of the active cell or cells.
• the mobile station comprises (in addition to means that may be conventional and therefore not described again here) for the control of radio measurements in connected mode and in a state of mobility management in which the mobile station performs cell re-selections:
• means 1 1 for configuring the mobile station for carrying out radio measurements according to radio measurement control information received in said radio measurement control dedicated message
• the configuration means 11 may in particular comprise means such as means for storing measurement control information received in said radio measurement control message, etc.
• the mobile station furthermore comprises means 13 for re-selecting the cell, on the basis of radio measurements as well as performed, these means transmitting if necessary to the network a cell update message.
• the mobile station may thus comprise, according to a first example:
• means 15 for configuring the mobile station for carrying out radio measurements according to the radio measurement control information received in said system information
• the mobile station may comprise:
• the mobile station also comprises control means 17, themselves receiving on the one hand information originating from means 18 for managing mobility management states, and on the other hand information from the means 13 for cell reselection.
• a network entity comprises (in addition to means that may be conventional and therefore not re-described here), for the control of radio measurements in connected mode and in a state of mobility management in which a mobile station performs cell re-selections:
• radio measurement control information said information including measurement type control information, said type of measurement being selected from a group comprising intra-frequency, inter-frequency, inter-radio access, and information including control information including measurement occurrence control information.
• Such a network entity corresponds in particular to a radio network controller (or RNC).
• RNC radio network controller
• a network entity comprises (besides means that may be conventional and therefore not re-described here):

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

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• 2005
  • 2005-03-25 FR FR0503007A patent/FR2883694B1/fr not_active Expired - Fee Related
• 2006
  • 2006-03-21 EP EP06726261A patent/EP1867197A1/de not_active Withdrawn
  • 2006-03-21 US US11/909,615 patent/US20080220766A1/en not_active Abandoned
  • 2006-03-21 WO PCT/FR2006/050242 patent/WO2006100405A1/fr active Application Filing
  • 2006-03-21 CN CNA2006800091856A patent/CN101147415A/zh active Pending

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