WO2007089128A1 - Procédé et appareil permettant de mesurer le transfert d'un équipement utilisateur en mode actif dans un système de communication mobile - Google Patents

Procédé et appareil permettant de mesurer le transfert d'un équipement utilisateur en mode actif dans un système de communication mobile Download PDF

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Publication number
WO2007089128A1
WO2007089128A1 PCT/KR2007/000606 KR2007000606W WO2007089128A1 WO 2007089128 A1 WO2007089128 A1 WO 2007089128A1 KR 2007000606 W KR2007000606 W KR 2007000606W WO 2007089128 A1 WO2007089128 A1 WO 2007089128A1
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WIPO (PCT)
Prior art keywords
measurement
cell
handover
ran
message
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Application number
PCT/KR2007/000606
Other languages
English (en)
Inventor
Kyeong-In Jeong
No-Jun Kwak
O-Sok Song
Sung-Ho Choi
Gert Jan Van Lieshout
Himke Van Der Velde
Original Assignee
Samsung Electronics Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Publication of WO2007089128A1 publication Critical patent/WO2007089128A1/fr

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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
    • H04W36/0088—Scheduling hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • FIG. 1 is a diagram illustrating a configuration of a 3GPP next generation mobile communication system to which the present invention is applicable;
  • FIG. 2 is a diagram illustrating a measurement procedure of an active mode UE according to an exemplary embodiment of the present invention
  • FIG. 3 is a signaling diagram of a measurement operation of a UE according to an exemplary embodiment of the present invention
  • FIG. 4 is a diagram illustrating a structure of a UE according to an exemplary embodiment of the present invention
  • FIG. 5 is a flowchart illustrating a measurement procedure of a network node according to an exemplary embodiment of the present invention
  • FIG. 6 is a flowchart illustrating another measurement procedure of a network node according to an exemplary embodiment of the present invention
  • FIG. 7 is a diagram illustrating a structure of a network node according to an exemplary embodiment of the present invention.
  • the present invention relates generally to a mobile communication system, and in particular, to a measurement method and apparatus for neighboring cells of an active mode User Equipment (UE).
  • UE User Equipment
  • a Universal Mobile Telecommunication Service (UMTS) system is an asynchronous 3 rd Generation Partnership Project (3GPP) mobile communication system that is based on Global System for Mobile Communications (GSM) and General Packet Radio Services (GPRS), which are European mobile communication systems, and uses Wideband Code Division Multiple Access (CDMA).
  • 3GPP defines a handover procedure and a measurement report procedure, for supporting mobility of a CELL Dedicated channel (CELL DCH) UE.
  • CELL DCH CELL Dedicated channel
  • CELL DCH UE indicates a UE in a Radio Resource Control
  • RRC Radio Resource Control
  • DPDCH Dedicated Physical Data Channel
  • DPDCH Dedicated Physical Control Channel
  • the term "handover” refers to a series of procedures in which if a cell (serving cell) where a UE is currently located is changed due to mobility of the UE, the UE can continuously receive the current dedicated data/control channels even in the new cell (target cell).
  • the term "measurement report” indicates a series of procedures in which in order to support the handover, a UE measures radio conditions for the current cell and a plurality of its neighboring cells, and reports the measurement results to the network.
  • the UE provides the measurement results on the radio conditions for the current cell and the neighboring cells to the network through the measurement report message, and if needed, the network hands over the UE to a target cell based on the measurement report message.
  • a network node controlling the target cell is different from the network node controlling the previous cell (serving cell)
  • information exchange for the UE between the network nodes, service information exchange of the UE, and resource reservation for transmission of data/control of the UE can be performed.
  • the measurement report for the handover can be classified into measurements for 3 purposes, such as intra-frequency handover, inter- frequency handover, and inter-Radio Access Technology (RAT) handover.
  • the intra-frequency handover indicates handover to a neighboring cell having the same frequency band as that of the current cell of the UE.
  • the inter- frequency handover indicates handover to a neighboring cell having a frequency band different from that of the current cell.
  • the inter-RAT handover indicates handover to a neighboring cell belonging to a system different from that of the current cell.
  • the measurement report is defined as periodic measurement report and event triggered measurement report.
  • the periodic measurement report periodically provides measurement results on radio conditions of the current cell and the neighboring cells, measured by the UE, to the network.
  • the event triggered measurement report previously defines a certain specific event, and if the event occurs, provides the measurement results to the network node.
  • Table 1 shows an event list defined in the 3GPP system for the intra- frequency measurement report.
  • Events Ia through If are events for intra-frequency measurement report, which can be used in a Frequency Division Duplex (FDD) system
  • Events Ig to Ii are events for intra-frequency measurement report, which can be used in a Time Division Duplex (TDD) system.
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • Events Ia, Ib and Ic are the events generally defined for soft handover.
  • soft handover refers to a procedure in which a UE, when it is located in a handover region, newly adds a radio link from a target cell while continuously maintaining the previous radio link from a source cell, and receives and combines the same data/control information from the two radio links from the target cell and the source cell, thereby smoothly performing handover from the target cell to the source cell. If the UE leaves the handover region and further moves to the center of the target cell, it disconnects the radio link from the source cell.
  • a UE Upon occurrence of Event Ia, a UE provides the network node with information on a Primary Common Pilot Channel (P-CPICH) that triggered the event.
  • P-CPICH Primary Common Pilot Channel
  • the network adds a new radio link from a cell indicated by the P-CPICH, for the UE.
  • a UE Upon occurrence of Event Ib, a UE provides the network node with information on a P-CPICH that triggered the event. Generally, if there is no limitation on other factors, the network removes a radio link for the UE from the cell indicated by the P-CPICH.
  • Event Ic indicates an intra-frequency measurement reporting event for maintaining an active set.
  • the active set is a set of radio links currently kept by the UE. For example, if a UE is located in a handover region and is keeping radio links from a cell A and a cell B, an active set for the UE indicates a set of the cell A and the cell B.
  • Occurrence of Event Ic indicates occurrence of a cell having a better radio condition than those of the cells included in the current active set.
  • a UE provides the network node with information on a P-CPICH that triggered the event.
  • the network replaces the cell indicated by the P-CPICH with a cell having the worst radio condition in the active set. In this case, the radio link for the UE from the cell indicated by the P-CPICH is added, while the radio link from the cell having the worst radio condition, included in the active set, is removed.
  • Event Id indicates an event for a High Speed Data Packet Access
  • HSDPA High Speed Downlink (DL) packet service through a shared channel using Hybrid Automatic Repetition request (HARQ) and scheduling.
  • HARQ Hybrid Automatic Repetition request
  • the HSDPA generally performs handover toward the cell having the best radio condition, because it does not support soft handover, unlike the general dedicated channel. If a UE, when it is located in a handover region, adds a new radio link to the target cell, a radio link from the source cell is disconnected. That is, the UE cannot simultaneously have a plurality of radio links from different cells.
  • Such handover is called hard handover.
  • a UE upon occurrence of Event Id, provides the network node with information on a P-CPICH that triggered the event.
  • the network determines the cell indicated by the P- CPICH as an HSDPA serving cell, disconnects the link for an HSDPA service from the serving cell, and sets up a link for the HSDPA service from the target cell.
  • Events Ie and If can be used when the network desires to manage the cells having radio conditions better than a threshold designated as a specific absolute threshold of the UE. Due to Event Ie, the UE can report the cells having better radio conditions than the specific absolute threshold, to the network node. Due to Event If, the UE can report the network node that its own radio condition was better than a specific absolute threshold due to Event Ie, but has become worse than the specific absolute threshold.
  • the specific absolute thresholds for Events Ie and If may have the same value or different values.
  • Events Ie and If can be used for the soft handover, instead of Events Ia and Ib.
  • a plurality of measurement reporting events for measurement report are defined in the conventional mobile communication system.
  • Such a measurement procedure causes an increase in complexity of the UE, and an increase in transmission of measurement reports due to the plurality of measurement reporting events may cause in an increase in signaling overhead.
  • a newly proposed mobile communication system needs to define measurement reporting events distinguishable from those of the conventional mobile communication system, and to define more efficient measurement report method and handover procedure.
  • An aspect of exemplary embodiments of the present invention is to address at least the problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the present invention is to provide a measurement method and apparatus for neighboring cells of an active mode UE in a mobile communication system.
  • Another aspect of the present invention is to provide a method and apparatus for performing handover after performing measurement on neighboring cells of an active mode UE in a mobile communication system.
  • Another aspect of the present invention is to provide a method and apparatus in which an active mode UE performs handover after performing measurement report on a target cell while minimizing power consumption in a mobile communication system.
  • Another aspect of the present invention is to provide a method and apparatus in which an active mode UE performs handover by re-performing measurement when it fails to perform handover due to the load situation of a target cell in a mobile communication system.
  • a neighboring cell measurement method of an active mode User Equipment (UE) in a mobile communication system is provided.
  • UE User Equipment
  • the method includes the UE detecting a measurement reporting event; sending a measurement report message including target cell information to an Evolved Radio Access Network (E-RAN) according to the event; activating a timer according to the measurement report message; stopping the measurement on the target cell at expiration of the timer if the UE fails to receive a handover command message corresponding to the measurement report message from the E-RAN before the expiration of the timer; and upon receipt of a re-measurement indicator message from the E-RAN, releasing the measurement stop on the target cell.
  • E-RAN Evolved Radio Access Network
  • a method for handing over an active mode User Equipment (UE) by an Evolved Radio Access Network (E-RAN) in a mobile communication system includes receiving from the UE a measurement report message including target cell information according to a measurement reporting event; determining whether to perform handover by checking a load situation of the target cell; upon detecting impossibility of handover to the target cell, including the target cell in a cell list including specific cells having better radio strength than that of a serving cell of each UE in a context configured for each UE; upon detecting possibility of handover to the target cell, sending a re-measurement indicator message to the UE; and upon receipt of a measurement report message including a measurement result value for the target cell from the UE, sending a handover command message.
  • UE User Equipment
  • E-RAN Evolved Radio Access Network
  • a handover method in a mobile communication system includes upon detecting, by a User Equipment (UE) Radio Resource Control (RRC)-connected to a serving cell, information indicating that radio strength of a specific neighboring cell of the serving cell is higher than that of the serving cell, sending a measurement report to an Evolved Radio Access Network (E-RAN); waiting for a handover command for a timer time which is set according to the measurement report from the E-RAN; stopping the measurement on the neighboring cell if the timer expires; and sending, by the E-RAN, a re- measurement indicator message for the neighboring cell to the UE to allow the UE to re-perform measurement on the neighboring cell, re-receiving a measurement report from the UE, and sending a handover command to the neighboring cell.
  • UE User Equipment
  • RRC Radio Resource Control
  • a User Equipment (UE) apparatus for performing handover in a mobile communication system.
  • the UE apparatus includes a manager for including in a cell list a Radio Resource Control (RRC)-connected serving cell, and neighboring cells whose radio strength is higher than that of the serving cell, and managing the cell list; a measurement executor for monitoring a measurement reporting event by measuring radio strength of the serving cell and radio strengths of the neighboring cells, and performing measurement on a specific neighboring cell for a predetermined time; a transceiver for sending a measurement report message to an Evolved Radio Access Network (E-RAN) according to the measurement reporting event, and waiting for a handover command message for a time set according to the measurement report message; and a timer controller for providing time information for receiving the handover command message.
  • RRC Radio Resource Control
  • the network apparatus includes a transceiver for receiving from a specific User Equipment (UE) a measurement report message including target cell information according to a measurement reporting event, and sending a handover command message to the target cell according to the measurement report message; a cell manager for managing a cell list including a serving cell for each UE and neighboring cells whose radio strength is higher than that of the serving cell, according to the measurement report message, and updating the cell list according to handover decision to the target cell; a radio resource manager for determining whether to hand over the UE to a specific neighboring cell according to the measurement report message; and a handover executor for handing over the UE to the target cell.
  • UE User Equipment
  • LTE Long Term Evolution
  • 3GPP 3 rd Generation Partnership Project
  • the present invention provides a measurement report and handover procedure in an LTE system.
  • the LTE system is technology for implementing high-speed packet based communication of about 100 Mbps.
  • service providers are discussing several schemes as to how they will operate the proposed LTE system.
  • FIG. 1 illustrates an exemplary configuration of an Evolved (or next generation) UMTS mobile communication system to which the present invention is applicable.
  • this system will be referred to as a "3GPP LTE system.”
  • a UE 110 indicates a UE for the LTE system
  • an Evolved Radio Access Network (E-RAN) 140 is a network device including a combined function of a Node B and a Radio Network Controller (RNC) in the existing 3GPP system.
  • RNC Radio Network Controller
  • the Node B which is a radio base station apparatus directly participating in communication with the UE, manages cells, and the RNC takes charge controls a plurality of Node Bs and controls radio resources.
  • the E-RAN 140 may perform a physically merged function of an Evolved Node B (E-NB) 120 and an Evolved RNC (E-RNC) 130, or may be separately implemented in different nodes.
  • E-NB Evolved Node B
  • E-RNC Evolved RNC
  • An Evolved Core Network (E-CN) 150 can be a node having a merged function of a Serving GPRS Support Node (SGSN) and a Gateway GPRS Support Node (GGSN) of the existing 3GPP system.
  • the E-CN 150 is located between a Packet Data Network (PDN) 160 and the E-RAN 140, and serves as a gateway for allocating an Internet Protocol (IP) address to the UE 110 and connecting the UE 110 to the PDN 160.
  • PDN Packet Data Network
  • IP Internet Protocol
  • the present invention will be described herein with reference to the system of FIG. 1, by way of example, the gist of the present invention can be applied to the existing 3GPP system or other systems in the same way.
  • intra- frequency measurement reporting for intra-frequency handover will be described herein by way of example, the present invention can also be applied to Inter-Frequency measurement/Handover or Inter-Radio Access Technology (RAT) measurement/Handover.
  • RAT Inter-Radio Access Technology
  • FIG. 2 is a diagram illustrating a measurement procedure and measurement report procedure according to the present invention.
  • the present invention defines only one intra-frequency measurement reporting event of Table 2 in association with intra-frequency handover.
  • the intra-frequency measurement reporting event of Table 2 indicates an event where a cell having higher radio strength than that of a serving cell (in which a UE is currently located, and that services signaling/data for the UE) is discovered.
  • reference numeral 201 denotes a UE in an active mode. That is the UE 201 is in the active mode state where it can exchange signaling with an E-RAN 202 in an RRC connected state. In addition, the UE 201 can exchange data with the E-RAN 202 using radio resources allocated in Time allocated depending on scheduling information.
  • the E-RAN 202 can exchange data for a specific service, using information on the UE 201 and context information for the service for the UE 201.
  • the UE 201 is continuously performing the measurement on intra- frequency neighboring cells. In step 211, the UE 201 detects occurrence of the intra-frequency measurement reporting event.
  • a serving cell of the UE 201 is a cell X
  • its neighboring cell is a cell A.
  • a description of the present invention will now made for an exemplary case where as a result of the intra-frequency measurement, the neighboring cell A has higher radio strength than that of the serving cell X.
  • the UE 201 sends in step 221 a MEASUREMENT REPORT message to inform the E-RAN 202 of occurrence of an event where it can perform the intra- frequency handover.
  • the MEASUREMENT REPORT message of step 221 can include a cell identifier for the neighboring cell A that triggered the event, and a measurement result value for the cell A.
  • the MEASUREMENT REPORT message can further include a measurement result (or measured) value of the current serving cell.
  • the UE 201 Upon starting transmission of the MEASUREMENT REPORT message or after completion of successful transmission of the MEASUREMENT REPORT message in step 221, the UE 201 starts a timer 'Measurement Stopping Timer' for stopping a measurement operation for the cell A if it fails to receive a
  • the timer is a reception waiting timer used for receiving a
  • HANDOVER COMMAND indicating handover to the cell A from the E-RAN 202, and the UE 201 continuously performs measurement on the cell A for the set time. If the UE 201 fails to receive the HANDOVER COMMAND to the cell A from the E-RAN 202 until the timer expires, the UE 201 no longer performs measurement on the cell A, recognizing that the handover to the cell A is impossible due to the network situation indicating, for example, the state in which the cell A is loaded.
  • step 231 the E-RAN 202 receiving the MEASUREMENT REPORT message of step 221 determines that it cannot hand over the UE 201 to the cell A included in the MEASUREMENT REPORT message, for example, because the cell A is loaded. Therefore, the E-RAN 202 does not perform the handover procedure on the UE 201.
  • the E-RAN 202 updates a context related to the radio condition of the UE 201. That is, the E-RAN 202 does not change a serving cell for the UE 201, but includes the cell A in a list of cells having better radio strength than that of the current serving cell X.
  • the E-RAN 202 sends, in step 241, no HANDOVER COMMAND message to the UE 201.
  • the HANDOVER COMMAND is a message for ordering the UE 201 to reconfigure radio resources to a target cell, as the E-RAN 202 determines handover for the UE 201. That is, the HANDOVER COMMAND message can include information on the radio resources to be used in the corresponding target cell.
  • the UE 201 includes the cell A in the list of cells having better radio strength than that of the serving cell X because it has failed to receive a HANDOVER COMMAND to the cell A until the timer that has started at transmission or transmission stop time of step 221 expires.
  • the UE 201 as it receive no HANDOVER COMMAND to the cell A, stops the measurement on the cell A in step 253. This is for efficient power saving of the UE, and the UE 201 stops the measurement procedure on the cell A, recognizing impossibility of handover to the cell A.
  • step 261 the E-RAN 202 detects that handover to the cell A is now possible. For example, this can be caused by a change in the load situation of the cell A from a loaded state to an unloaded state.
  • the E-RAN 202 sends the UE 201 a RE-MEASUREMENT INDICATOR message indicating that handover to the cell A is now possible, i.e. orders the UE 201 to perform re-measurement on the cell A.
  • the RE- MEASUREMENT INDICATOR message can include information such as a cell ID indicating the cell A.
  • the RE-MEASUREMENT INDICATOR message of step 263 can be sent only to the UE 201.
  • the RE-MEASUREMENT INDICATOR message can be sent to a plurality of UEs, for which the cell A was better than the serving cell X but handover thereto was impossible.
  • the RE- MEASUREMENT INDICATOR message can be sent to every UE, for which the cell A was better than the serving cell X but handover thereto was impossible.
  • the E-RAN 202 can select one specific UE or a plurality of UEs that will receive the RE-MEASUREMENT INDICATOR message, by managing a serving cell and a list of better cells having better radio conditions than that of the serving cell for each individual UE.
  • the E-RAN 202 includes the cell A having a better radio condition than that of the serving cell X of the UE 201 in the better cells for the UE 201, and manages them. Therefore, using the cell list, the E-RAN
  • the E-RAN 202 may not send the RE- MEASUREMENT INDICATOR message of step 263 if the currently received Channel Quality Indicator (CQI) keeps a sufficiently high value.
  • CQI Channel Quality Indicator
  • the E-RAN 202 when the E-RAN 202 sends the RE-MEASUREMENT INDICATOR message to one or a plurality of UEs, reference can be made not only to the 'better cells context information' of the corresponding UE but also to other factors such as the radio condition of the current serving cell of the UEs. In this case, the E-RAN 202 should provide information on one or a plurality of UEs that should receive the RE-MEASUREMENT INDICATOR message, using IDs of the UEs.
  • the E-RAN 202 sends the RE-MEASUREMENT INDICATOR message to all UEs for which the cell A was better than the serving cell X but handover thereto was impossible, the E-RAN 202 sends in step 263 the RE- MEASUREMENT INDICATOR not with a message being sent to a specific UE, but with a common message all the UEs can receive.
  • step 271 the corresponding UE receiving the RE-MEASUREMENT
  • INDICATOR message checks it better cell and performs re-measurement thereon.
  • step 281 the UE 201 detects occurrence of a Measurement Reporting Event as a result of the re-measurement on the cell A. That is, as a result of the re- measurement on the cell A, the UE 201 recognizes that the cell A has better radio strength than that of the serving cell X.
  • the UE 201 sends a MEASUREMENT REPORT for the cell A to the E-RAN 202.
  • the MEASUREMENT REPORT message of step 291 can include ID information indicating the cell A, and the measurement result on the cell A, i.e. measured value for the cell A.
  • the MEASUREMENT REPORT message can further include a measurement result value for the current serving cell.
  • the E-RAN 202 receiving the MEASUREMENT REPORT message determines in step 293 to perform handover to the cell A and sends a HANDOVER COMMAND to the UE 201.
  • the second embodiment has a procedure which is partially different from that of the first embodiment.
  • the E-RAN 202 sends a MEASUREMENT STOP INDICATOR message to the UE 201 , if it has received the MEASUREMENT REPORT message of step 221 but cannot hand over the UE 201 to the cell A as in step 231.
  • the E-RAN 202 directly provides information indicating that the cell A has better radio strength than that of the serving cell X but the E-RAN 202 cannot hand over the UE 201 to the cell A.
  • the UE 201 Upon receipt of the MEASUREMENT STOP INDICATOR message, the UE 201 stops the measurement on the cell A.
  • the MEASUREMENT STOP INDICATOR message can include indicator information for stopping the measurement on the cell A, an ID of a neighboring cell, the measurement on which will be stopped, and timer information indicating how long the measurement on the neighboring cell will be stopped. If no timer information is included in the MEASUREMENT STOP INDICATOR message, the UE 201 resumes the measurement on the neighboring cell upon receipt of a RE-MEASUREMENT INDICATOR message. However, if the timer information is included in the MEASUREMENT STOP INDICATOR message, the UE 201 automatically resumes the measurement on the neighboring cell without receipt of the RE-MEASUREMENT INDICATOR message from the E-RAN 202, as soon as the set timer expires.
  • the UE 201 resumes the measurement, and if the Measurement
  • step 211 the UE 201 sends the
  • the UE 201 stops the measurement on the cell until the timer re-expires. Thereafter, if the timer expires, the UE 201 resumes the measurement on the cell. The foregoing operation is repeatedly performed.
  • a description of the third embodiment will be made for an exemplary case where the UE 201 employs another Measurement Reporting Event when it receives the RE-MEASUREMENT INDICATOR message from the E-RAN 202.
  • the UE 201 upon detecting the Measurement Reporting Event, i.e. detecting a cell having better radio strength than that of the current serving cell where the UE 201 is located, the UE 201 receiving the RE-MEASUREMENT INDICATOR message of step 263 performs re-measurement on the cell A, and sends the MEASUREMENT REPORT of 291 to the E-RAN 202 only when the re-measurement result on the cell A is better than that of the current serving cell.
  • the UE 201 upon receipt of the RE- MEASUREMENT INDICATOR from the E-RAN 202, the UE 201 sends the MEASUREMENT REPORT of 291 to the E-RAN 202 when the cell A has worse radio strength than that of the current serving cell, unlike in the first embodiment.
  • the UE 201 upon receipt of the RE- MEASUREMENT INDICATOR message of step 263 from the E-RAN 202, the UE 201 can be set to send the MEASUREMENT REPORT of 291 to the E-RAN 202 for the cell A regardless of whether the measurement result on the cell A has better radio strength or worse radio strength than that of the serving cell.
  • FIG. 3 is a signaling diagram of a UE according to an exemplary embodiment of the present invention.
  • FIG. 3 A description of FIG. 3 will be made for an exemplary case where the UE of FIG. 2 uses a timer and the Measurement Reporting Event ('A cell is better than serving cell').
  • the procedure of FIG. 3 includes a method using the MEASUREMENT STOP INDICATOR message additionally described in FIG. 2, and a method of using the Measurement Reporting Events of the foregoing two cases.
  • a UE transitions to an active mode in step 301, and performs measurement in step 311.
  • intra-frequency measurement can be an example of the measurement of step 311.
  • the present invention can include inter-frequency measurement, and inter-system measurement. That is, the present invention aims at performing measurement on the current serving cell of a UE, and neighboring cells of the serving cell.
  • the measurement of step 311 is performed on radio strengths for a serving cell of the UE and neighboring cells having the same frequency as that of the serving cell.
  • the present invention includes the inter- frequency measurement for measuring radio strength for the serving cell of the UE and neighboring cells having a different frequency band, and also includes the inter-system measurement for measuring radio strength for the current serving cell and neighboring cells belonging to a different network system.
  • the UE if it is determined in step 313 that there is any neighboring cell having better radio strength than that of the current serving cell as a result of the measurement on the intra- frequency neighboring cells, the UE proceeds to step 321 where it sends a MEASUREMENT REPORT based on the Measurement Reporting Event to an E- RAN, and starts a timer 'Measurement Stop Timer' in response to the MEASUREMENT REPORT for a predetermined time.
  • the MEASUREMENT REPORT can include cell ID information indicating a cell having better radio strength than that of the serving cell, measurement result value for the cell, serving cell ID, measurement result value for the serving cell, etc.
  • the timer is a reception waiting timer used for receiving a HANDOVER COMMAND instructing handover to the target cell included in the MEASUREMENT REPORT of the UE, i.e. for receiving a HANDOVER COMMAND including handover information to the target cell.
  • step 331 If the UE receives a HANDOVER COMMAND to the target cell before expiration of the timer in step 323, the UE proceeds to step 331 where it performs handover as ordered. However, if the UE receive no HANDOVER COMMAND to the target cell before expiration of the timer in step 323, the UE proceeds to step in step 333 where it stops the timer, stops the measurement on the target cell included in the MEASUREMENT REPORT of step 321, and includes the target cell in its better cells context information.
  • the better cells context information can include a cell having better radio strength than that of the actual serving cell, and a list of the cells for which the UE has stopped measurement as it received no HANDOVER COMMAND to the corresponding cells from the E-RAN. That is, the UE includes the measurement stopped cells in the better cells context when it stops the measurement on the corresponding cells, and later removes the cells from the better cells context if re- measurement on the measurement stopped cells is performed.
  • step 333 the UE returns to step 311 where it continuously performs the measurement on the other neighboring cells having the same intra-frequency except for the cells, measurement on which was stopped in step 333.
  • step 313 If it is determined in step 313 that there is no neighboring cell having better radio strength than that of the serving cell, the UE proceeds to step 341.
  • step 341 the UE determines whether it receives from the E-RAN a RE-MEASUREMENT INDICATOR for a cell included in its better cells context. Upon receipt of the RE-MEASUREMENT INDICATOR, the UE proceeds to step 351 where it resumes the measurement on the cell included in the RE- MEASUREMENT INDICATOR of step 341, and removes the cell, re- measurement on which is performed, from the better cells context.
  • FIG. 4 is a block diagram illustrating a structure of a UE according to an exemplary embodiment of the present invention.
  • a UE includes a measurement executor 401 for performing measurement on intra-frequency neighboring cells, a manager 411 for managing neighboring cells, intra-frequency measurement on which will be performed (i.e. intra-frequency measurement candidates), a timer controller 431 for controlling a timer for a predetermined time, and a transceiver 421 for transmitting/receiving measurement-related control messages.
  • the measurement executor 401 connected to the manager 411 via an interface, determines on which neighboring cells it will perform measurement, and performs measurement on intra-frequency neighboring cells based on the determined information.
  • the UE sends a MEASUREMENT REPORT message to an E-RAN using the transceiver 421.
  • the timer controller 431 starts the timer. If the UE fails to receive from the E-RAN a HANDOVER COMMAND for ordering it to perform handover to a corresponding target cell included in the MEASUREMENT
  • the manager 411 excludes the target cell from measurement candidates. If the target cell is excluded from the measurement candidates, the excluded target cell is included in a better cells context.
  • the measurement executor 401 performs measurement on the intra-frequency neighboring cells except for the target cell of the manager 411.
  • the measurement executor 401 determines if a cell corresponding to the RE-MEASUREMENT INDICATOR is included in the better cells context of the manager 411. If it is determined that the cell is included, the measurement executor 401 deletes the cell from the better cells context of the manager 411 and re-includes the cell in the intra-frequency measurement candidates.
  • the measurement executor 401 enables to resume intra- frequency measurement on the cell.
  • FIG. 5 is a flowchart illustrating an operating procedure of an E-RAN according to an exemplary embodiment of the present invention.
  • an E-RAN receives a MEASUREMENT REPORT based on intra- frequency measurement results from a UE in step 501.
  • step 511 the E-RAN checks if it can hand over the UE to a target cell corresponding to the MEASUREMENT REPORT of step 501.
  • the E-RAN performs a handover procedure related to the UE in step 521. That is, the E-RAN sends a HANDOVER COMMAND to the UE.
  • the E-RAN updates measurement-related context information for the UE. That is, the E-RAN changes the serving cell of the UE to a target cell, and initializes a better cells list.
  • step 511 If it is determined in step 511 that handover to the target cell corresponding to the MEASUREMENT REPORT of step 501 is not possible, the E-RAN stops the related handover procedure in step 531, and updates measurement-related context information for the UE in step 533. That is, the E- RAN maintains the serving cell of the UE, but includes the target cell of step 501 in the better cells.
  • FIG. 6 is a flowchart illustrating another procedure of an E-RAN according to an exemplary embodiment of the present invention.
  • the signaling diagram of FIG. 6 is given for the case where cell/network states are changed such that the E-RAN can perform handover to the target cell, handover to which it could't perform according to the MEASUREMENT REPORT of FIG. 5.
  • the E-RAN monitors a change in the cell/network states in step 601. For example, the E-RAN monitors a change in the cell state from a loaded state to an unloaded state.
  • step 603 the E-RAN checks a previous state for the cell that underwent the change.
  • step 605 If it is determined in step 605 that the change from the previous state of the target cell to the current state changes the handover-impossible cell to a handover-possible cell, the E-RAN proceeds to step 621.
  • step 621 the E-RAN checks if there is any UE including in its better cells context the cell of step 601 among the current active mode UEs.
  • the E-RAN proceeds to step 631 where it sends a RE-MEASUREMENT INDICATOR corresponding to the cell of step
  • the RE-MEASUREMENT INDICATOR message can include a cell ID for the corresponding cell, re-measurement on which will be performed.
  • step 633 the E-RAN receives a MEASUREMENT REPORT from the corresponding UEs.
  • step 605 if it is determined in step 605 that there is no change in the handover to the cell of step 601 from 'Impossible' to 'Possible, or if it is determined in step 621 that there is no UE including in its better cells list the cell of step 601 among the current active mode UEs, the E-RAN takes no specific action.
  • FIG. 7 is a diagram illustrating a structure of an E-RAN according to an exemplary embodiment of the present invention.
  • an E-RAN includes a control message transceiver
  • RRM Radio Resource manager
  • the measurement-related control message transceiver 711 receives a MEASUREMENT REPORT for intra-frequency measurement from a UE.
  • the manager 721 manages a serving cell and better cells given for each individual UE according to the MEASUREMENT REPORT.
  • the manager 721 determines whether there is another cell, i.e. target cell, having better radio strength than that of the current serving cell of the UE that sent the MEASUREMENT REPORT.
  • the RRM 731 depending on the manager 721, checks whether the UE that performed the measurement report can perform handover to the corresponding target cell.
  • the RRM 731 a functional block that manages information on the intra-cell/inter-cell radio resources, can be included in the E-
  • the E-RAN performs an intra-frequency handover procedure using the handover executor 741, and sends a HANDOVER COMMAND to the target cell to the UE using the control message transceiver 711.
  • the E-RAN has no need to perform the handover procedure and send the
  • HANDOVER COMMAND includes the target cell for the UE in a better cells context of the manager 721. This is to send a RE-MEASUREMENT
  • the RE-MEASUREMENT INDICATOR is transmitted to the corresponding UEs through the control message transceiver
  • the present invention defines an event supporting intra-frequency handover of an active mode UE according to the 3GPP LTE system.
  • the present invention performs measurement on intra- frequency neighboring cells in the 3GPP LTE system only for a predetermined time, thereby minimizing power consumption of the UE.
  • the UE and the network node manage a context including a cell list for intra-frequency measurement. Therefore, it is possible to efficiently perform the procedure based on re-measurement of the UE, thereby efficiently performing the handover.

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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 un procédé et un appareil de mesure destinés à une cellule avoisinante d'un équipement utilisateur ('User Equipment' ou UE) en mode actif dans un système de communication mobile. Selon l'invention, on définit un événement de rapport de mesure en fonction du transfert de l'équipement utilisateur en mode actif, et on effectue une mesure sur une cellule cible spécifique correspondant à l'événement pendant une période de temps prédéterminée, minimisant de la sorte la consommation d'énergie de l'équipemen utilisateur. En outre, chaque noeud du système de communication mobile possède un contexte de service qui est fonction d'un rapport de mesure, assurant de la sorte un transfert qui s'effectue avec une procédure de renouvellement de mesure efficace.
PCT/KR2007/000606 2006-02-03 2007-02-05 Procédé et appareil permettant de mesurer le transfert d'un équipement utilisateur en mode actif dans un système de communication mobile WO2007089128A1 (fr)

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WO2009046672A1 (fr) * 2007-09-30 2009-04-16 Huawei Technologies Co., Ltd. Procédé et équipement dans un réseau d'évolution
WO2009130558A1 (fr) * 2008-04-23 2009-10-29 Nokia Corporation Autre interaction de technologie radio/geran pour rapporter une mesure de cellule voisine
WO2010031331A1 (fr) * 2008-09-22 2010-03-25 华为技术有限公司 Procédé, terminal mobile et station de base permettant de soumettre un rapport de mesure et d’envoyer des informations de cellule cible
WO2010127537A1 (fr) * 2009-05-08 2010-11-11 华为技术有限公司 Procédé, appareil et système de rapport de résultat de mesure de cellule de groupe fermé d'abonnés
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CN102036328A (zh) * 2009-09-30 2011-04-27 中兴通讯股份有限公司 一种s1切换中业务准备失败的处理方法及系统
WO2011131004A1 (fr) * 2010-04-21 2011-10-27 中兴通讯股份有限公司 Procédé et terminal de gestion des comptes rendus de meilleure cellule
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CN102256299A (zh) * 2011-07-06 2011-11-23 大唐移动通信设备有限公司 一种终端测量上报方法及其装置
CN102469498A (zh) * 2010-11-12 2012-05-23 中兴通讯股份有限公司 频外检测小区的测量上报方法、ue及rnc
WO2013070127A1 (fr) * 2011-11-10 2013-05-16 Telefonaktiebolaget Lm Ericsson (Publ) Procédés et agencement pour gérer un transfert de données dans un réseau cellulaire
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EP2262315A4 (fr) * 2008-03-25 2017-03-08 NTT DoCoMo, Inc. Station mobile et station de base radio
CN109391955A (zh) * 2017-08-08 2019-02-26 维沃移动通信有限公司 一种转换测量模式的方法和装置
CN111132251A (zh) * 2013-08-02 2020-05-08 三星电子株式会社 通信系统中的终端及其方法
WO2021027546A1 (fr) * 2019-08-15 2021-02-18 维沃移动通信有限公司 Procédé de mesure de mobilité dans un état inactif ou de veille rrc et dispositif
CN114826528A (zh) * 2010-07-27 2022-07-29 索尼公司 电子设备

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WO2008022603A1 (fr) * 2006-08-18 2008-02-28 Huawei Technologies Co., Ltd. Procédé et appareil pour réaliser des mesures inter-fréquences
WO2009046672A1 (fr) * 2007-09-30 2009-04-16 Huawei Technologies Co., Ltd. Procédé et équipement dans un réseau d'évolution
EP2262315A4 (fr) * 2008-03-25 2017-03-08 NTT DoCoMo, Inc. Station mobile et station de base radio
WO2009130558A1 (fr) * 2008-04-23 2009-10-29 Nokia Corporation Autre interaction de technologie radio/geran pour rapporter une mesure de cellule voisine
US8619608B2 (en) 2008-04-23 2013-12-31 Nokia Corporation Other radio technology / GERAN interworking for neighbor cell measurement reporting
CN101686487B (zh) * 2008-09-22 2012-07-04 华为技术有限公司 测量报告上报及目标小区信息下发方法、移动终端和基站
WO2010031331A1 (fr) * 2008-09-22 2010-03-25 华为技术有限公司 Procédé, terminal mobile et station de base permettant de soumettre un rapport de mesure et d’envoyer des informations de cellule cible
WO2010127537A1 (fr) * 2009-05-08 2010-11-11 华为技术有限公司 Procédé, appareil et système de rapport de résultat de mesure de cellule de groupe fermé d'abonnés
CN101925087A (zh) * 2009-06-11 2010-12-22 中兴通讯股份有限公司 一种封闭用户组小区的测量上报方法及相应的用户设备
US8948766B2 (en) 2009-06-11 2015-02-03 Zte Corporation Measurement reporting method for closed subscriber group cell and corresponding user equipment
CN102036328A (zh) * 2009-09-30 2011-04-27 中兴通讯股份有限公司 一种s1切换中业务准备失败的处理方法及系统
CN102238612A (zh) * 2010-04-21 2011-11-09 中兴通讯股份有限公司 最好小区上报处理方法及终端
WO2011131004A1 (fr) * 2010-04-21 2011-10-27 中兴通讯股份有限公司 Procédé et terminal de gestion des comptes rendus de meilleure cellule
US8868080B2 (en) 2010-04-23 2014-10-21 Telefonaktiebolaget L M Ericsson (Publ) Handover in case of a radio link failure
WO2011133079A1 (fr) 2010-04-23 2011-10-27 Telefonaktiebolaget L M Ericsson (Publ) Amélioration du transfert en cas de défaillance d'une liaison radio
CN114826528A (zh) * 2010-07-27 2022-07-29 索尼公司 电子设备
CN102469498A (zh) * 2010-11-12 2012-05-23 中兴通讯股份有限公司 频外检测小区的测量上报方法、ue及rnc
CN102256299A (zh) * 2011-07-06 2011-11-23 大唐移动通信设备有限公司 一种终端测量上报方法及其装置
WO2013070127A1 (fr) * 2011-11-10 2013-05-16 Telefonaktiebolaget Lm Ericsson (Publ) Procédés et agencement pour gérer un transfert de données dans un réseau cellulaire
US9510259B2 (en) 2011-11-10 2016-11-29 Telefonaktiebolaget Lm Ericsson (Publ) Methods and arrangement for handling a data transferral in a cellular network
US9609570B2 (en) * 2012-11-28 2017-03-28 Telefonaktiebolaget Lm Ericsson (Publ) Method and network node for handling handover
US20150304933A1 (en) * 2012-11-28 2015-10-22 Telefonaktiebolaget L M Ericsson (Publ) Method and network node for handling handover
CN111132251A (zh) * 2013-08-02 2020-05-08 三星电子株式会社 通信系统中的终端及其方法
CN111132251B (zh) * 2013-08-02 2022-05-13 三星电子株式会社 通信系统中的终端及其方法
CN109391955A (zh) * 2017-08-08 2019-02-26 维沃移动通信有限公司 一种转换测量模式的方法和装置
US11102685B2 (en) 2017-08-08 2021-08-24 Vivo Mobile Communication Co., Ltd. Method of switching measurement mode and device thereof
WO2021027546A1 (fr) * 2019-08-15 2021-02-18 维沃移动通信有限公司 Procédé de mesure de mobilité dans un état inactif ou de veille rrc et dispositif

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