JP2012005031A - Mobile communication method, mobile station, and radio access network apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow appropriate "MDT Log" reporting even when a mobile station UE moves from an "RRC_Idle state" to an "RRC_Connected state" within a cell different from a cell where the mobile station UE is informed of its "MDT Configuration".SOLUTION: A mobile communication method comprises: a step A of informing a mobile station UE, which is in an "RRC_Connected state" and located in a cell #1, of "MDT Configuration #1"; a step B in which the mobile station UE moves to an "RRC_Idle state" and performs a radio quality measurement as specified in the "MDT Configuration #1"; and a step C of informing a radio base station eNB #2, that the mobile station UE has already stored the "MDT Configuration", when the mobile station UE moves from an "RRC_Idle state" to an "RRC_Connected state" in a cell #2.

Description

  The present invention relates to a mobile communication method, a mobile station, and a radio access network apparatus.

  In the LTE (Long Term Evolution) method, it is specified to perform a method called “MDT (Minimization of Drive Tests)” that causes a mobile station UE to measure and report desired radio quality.

  In such MDT, the mobile station UE measures the desired radio quality by the measurement method specified by “MDT Configuration” transmitted by the radio base station eNB, and the mobile station UE When requested by the radio base station eNB, the measurement result is reported as “MDT Log”.

3GPP TR36.805 3GPP TS37.320

  Here, in the example of FIG. 6, the mobile station UE in the “RRC_Connected state” in the cell # 1 receives the “MDT Configuration # 1” transmitted by the radio base station eNB # 1, and transitions to the “RRC_Idle state”. Later, based on the “MDT Configuration # 1”, the desired radio quality is measured and stored as “MDT Log # 1”.

  However, before reporting the stored “MDT Log # 1”, the mobile station UE transits to the “RRC_Connected state” in the cell # 2 and transmits it by the radio base station eNB # 2 that manages the cell # 2. When the received “MDT Configuration # 2” is received, the “MDT Log # 1” is deleted even though the “MDT Log # 1” has not been reported yet.

  Therefore, the present invention has been made in view of the above-described problem, and is a case where a mobile station in the “RRC_Idle state” transitions to the “RRC_Connected state” in a cell different from the cell in which the “MDT Configuration” is notified. However, an object of the present invention is to provide a mobile communication method, a mobile station, and a radio access network apparatus that can appropriately report “MDT Log”.

  A first feature of the present invention is a mobile communication method, comprising: a step A for notifying a mobile station connected in a first cell under a first radio access network of a method for measuring a desired radio quality; Step B in which the mobile station transitions to the standby state and measures the desired radio quality based on the measurement method, and the mobile station in the standby state is connected in the second cell under the second radio access network. And a step C of notifying the radio access network device managing the second cell that the measurement method of the desired radio quality is already stored in the mobile station when transitioning to To do.

  A second feature of the present invention is a reception configured to receive a desired radio quality measurement method when the mobile station UE is in a connected state in a first cell under the first radio access network. And a measurement unit configured to measure the desired radio quality based on the measurement method after transitioning to the standby state, and connected from the standby state to the second cell under the second radio access network A transmission unit configured to notify the radio access network device that manages the second cell that the measurement method of the desired radio quality has already been stored when the state is changed to This is the gist.

  According to a third aspect of the present invention, there is provided a radio access network apparatus comprising a transmitter configured to notify a mobile station connected in a subordinate cell of a measurement method of desired radio quality. And the transmission unit is configured not to transmit the measurement method of the desired radio quality when receiving a signal for notifying that the measurement method of the desired radio quality is already stored from the mobile station. It is a summary.

  As described above, according to the present invention, even when the mobile station in the “RRC_Idle state” transitions to the “RRC_Connected state” in a cell different from the cell in which the “MDT Configuration” is notified, the “MDT Log” Can be appropriately reported, a mobile station, and a radio access network apparatus.

1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention. FIG. 3 is a functional block diagram of a mobile station according to the first embodiment of the present invention. FIG. 3 is a functional block diagram of a radio base station according to the first embodiment of the present invention. It is a figure for demonstrating operation | movement of the mobile communication system which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating operation | movement of the mobile communication system which concerns on the 2nd Embodiment of this invention. It is a figure for demonstrating operation | movement of the conventional mobile communication system.

(Mobile communication system according to the first embodiment of the present invention)
A mobile communication system according to a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the mobile communication system according to the present embodiment includes an operation and maintenance server OAM, a mobility management node MME (Mobility Management Entity), and a radio base station eNB as an LTE radio access network device. is doing.

  As shown in FIG. 2, the mobile station UE according to the present embodiment includes a receiving unit 11, an MDT configuration storage unit 12, a measurement unit 13, an MDT log storage unit 14, and a transmission unit 15. .

  The receiving unit 11 is configured to receive a signal transmitted by a radio access network device (for example, a radio base station eNB).

  For example, when the mobile station UE is in the “RRC_Connected state” in the cell # 1 under the radio access network RAN # 1, the reception unit 11 receives an RRC (Radio Resource Control) from the radio base station eNB that manages the cell # 1. ) As a signal, “MDT Configuration # 1” is received.

  The MDT Configuration storage unit 12 is configured to store “MDT Configuration” received by the receiving unit 11.

  The MDT Configuration storage unit 12 is configured to store only one type of “MDT Configuration”.

  The measurement unit 13 is configured to measure the desired radio quality by a measurement method specified by “MDT Configuration” stored in the MDT Configuration storage unit 12.

  The MDT Log storage unit 14 is configured to store the desired radio quality measured by the measurement unit 13 as “MDT Log”.

  The MDT Log storage unit 14 is configured to store only one type of “MDT Log”.

  The transmission unit 15 is configured to transmit a signal to a radio access network device (for example, a radio base station eNB).

  For example, when the mobile station UE is in the “RRC_Connected state”, the transmission unit 15 uses the radio access network device (for example, the report method specified by “MDT Configuration” stored in the MDT Configuration storage unit 12). , The radio base station eNB) is configured to report “MDT Log” stored in the MDT Log storage unit 14.

  Further, when the mobile station UE moves to the cell # 2 under the radio access network RAN # 2 from the cell # 1 that has received the “MDT Configuration” in the “RRC_Idle state”, and then transitions to the “RRC_Connected state”. The transmission unit 15 is configured to transmit “MDT Configuration Indication” for notifying that the “MDT Configuration” is already stored to the radio base station eNB # 2 that manages the cell # 2. Yes.

  When the mobile station UE moves to the cell # 2 from the cell # 1 that has received the “MDT Configuration” in the “RRC_Idle state” and then transitions to the “RRC_Connected state”, the transmission unit 15 moves the cell # 2 “MDT Log Indication” for notifying that “MDT Log” is stored may be transmitted to the radio base station eNB # 2 that manages the “MDT Log”.

  As illustrated in FIG. 3, the radio base station eNB according to the present embodiment includes a receiving unit 21, a transmitting unit 22, and an MDT Log storage unit 23.

  The receiving unit 21 is configured to receive signals transmitted by the mobile station UE and the mobility management node MME.

  For example, the receiving unit 21 is configured to receive “MDT Log”, “MDT Configuration Indication”, “MDT Log Indication”, and the like transmitted by the mobile station UE.

  The receiving unit 21 is configured to receive the “MDT Data Collection start instruction signal” transmitted by the mobility management node MME.

  The transmission unit 22 is configured to transmit a signal to the mobile station UE and the mobility management node MME.

  For example, when the reception unit 21 receives the “MDT Data Collection start instruction signal”, the transmission unit 22 performs “MDT Configuration” on the mobile station UE in the “RRC_Connected state” in the cell under the radio base station eNB. May be configured to transmit.

  However, even when the receiving unit 21 receives the “MDT Data Collection start instruction signal” addressed to the mobile station UE from the mobility management node MME, the receiving unit 21 receives “MDT Configuration Indication” from the mobile station UE. If so, the transmission unit 22 may be configured not to transmit “MDT Configuration” to the mobile station UE.

  Further, when the receiving unit 21 receives “MDT Log Indication” transmitted by the mobile station UE, the transmitting unit 22 is configured to transmit an “MDT Log report request signal” to the mobile station UE. May be.

  The MDT Log storage unit 23 is configured to store “MDT Log” received by the receiving unit 21.

  Hereinafter, an example of the operation of the mobile communication system according to the first embodiment of the present invention will be described with reference to FIG.

  As shown in FIG. 4, when the mobile station UE is in the “RRC_Connected state” in the cell # 1 under the radio base station eNB # 1 in the radio access network RAN # 1, in step S1001, the operation and maintenance server OAM # 1 transmits the “MDT Data Collection start instruction signal” including the identification information of the mobile station UE and “MDT Policy” to the mobility management node MME # 1.

  Here, “MDT Policy” includes “Log type”, “Acquired data type”, “Acquisition period”, “UE Capability Policy”, and the like.

  “Log type” can be set to “Logged MDT” or “Immediate MDT”, and “Acquisition data type” can be set to “Coverage Map”, “RLF”, “Throughput”, etc. In “UE Capability Policy”, “Buffer Size”, “Logged / Immediate MDT compatible”, and the like can be set.

  In step S1002, the mobility management node MME # 1 uses the dedicated signaling for the mobile station UE (for example, Trace Procedure) to the radio base station eNB # 1, including “MDT Data Collection” including “MDT Policy”. An instruction signal ”is transmitted.

  “MDT Policy” may be set in advance in the radio base station eNB # 1. In this case, in Step S1001 and Step 1002, the mobility management node MME # 1 transmits only the “MDT Data Collection start instruction signal”.

  In step S1003, the radio base station eNB # 1 transmits "MDT Configuration # 1" to the mobile station UE # 1.

  In step S1004, the mobile station UE stores the received “MDT Configuration # 1”, transitions to the “RRC_Idle state” in step S1005, and uses the measurement method specified by “MDT Configuration # 1” in the desired radio. Measure quality and store as “MDT Log # 1”.

  Here, when the mobile station UE transitions to the “RRC_Idle state”, the context information related to “MDT Configuration # 1” stored in the radio base station eNB # 1 is deleted.

  In step S1006, the mobile station UE moves from the cell # 1 to the cell # 2 and transitions from the “RRC_Idle state” to the “RRC_Connected state”. In step S1007, the radio base station eNB # 2 that manages the cell # 2 In response, “MDT Configuration Indication” for notifying that “MDT Configuration” is already stored is transmitted.

  Here, the mobile station UE may transmit “MDT Log Indication” for notifying that the “MDT Log” is stored to the radio base station eNB # 2.

  On the other hand, in step S2001, the operation and maintenance server OAM # 2 transmits the “MDT Data Collection start instruction signal” including the identification information of the mobile station UE and “MDT Policy” to the mobility management node MME # 2. In S2002, the mobility management node MME # 2 transmits an “MDT Data Collection start instruction signal” including “MDT Policy” to the radio base station eNB # 2 using dedicated signaling for the mobile station UE.

  Here, the radio base station eNB # 2 receives the “MDT Data Collection start instruction signal” addressed to the mobile station UE from the mobility management node MME # 2, but receives the “MDT Configuration Indication” from the mobile station UE. Therefore, in step S2003, “MDT Configuration # 2” is not transmitted to the mobile station UE.

  In addition, when the mobile station UE receives the “MDT Log report request signal” from the radio base station eNB # 2 in the cell # 2, the mobile station UE is notified in the cell # 1 to the radio base station eNB # 2. It may be configured to transmit “MDT Log # 1” acquired in response to “MDT Configuration # 1”.

  In this embodiment, the case where both the radio access networks RAN # 1 and RAN # 2 are LTE radio access networks has been described as an example. However, the present invention is not limited to the radio access network RAN # 1. And the case where RAN # 2 is a radio access network of another method is also applicable.

  According to the mobile communication system according to the first embodiment of the present invention, when the mobile station UE has already stored “MDT Configuration # 1” when transitioning to the “RRC_Connected state” in the cell # 2. Is configured so that the radio base station eNB # 2 does not transmit “MDT Configuration # 2” to the mobile station UE, so that the mobile station UE does not delete “MDT Log # 1”. Report appropriately.

(Mobile communication system according to the second embodiment of the present invention)
Hereinafter, the mobile communication system according to the second embodiment of the present invention will be described with reference to FIG. 5 while focusing on differences from the mobile communication system according to the first embodiment described above.

  As shown in FIG. 5, the operations of steps S3001 to S3006 are the same as the operations of steps S1001 to S1006 shown in FIG.

  On the other hand, in step S4001, the operation and maintenance server OAM # 2 transmits a “MDT Data Collection start instruction signal” including the identification information of the mobile station UE and “MDT Policy” to the mobility management node MME # 2. In S4002, the mobility management node MME # 2 transmits an “MDT Data Collection start instruction signal” including “MDT Policy” to the radio base station eNB # 2 using dedicated signaling for the mobile station UE.

  In “Initial Context Setup Procedure” performed between the mobility management node MME # 2 and the radio base station eNB # 2 in step S4003, the mobility management node MME # 2 moves with respect to the radio base station eNB # 2. The station UE notifies that “MDT Configuration” has already been stored.

  The mobility management node MME # 2 receives a signal for notifying that “MDT Configuration” is already stored in the mobile station UE from the mobility management node MME # 1 or the operation and maintenance server OAM # 2. It is configured.

  Here, the radio base station eNB # 2 receives the “MDT Data Collection start instruction signal” addressed to the mobile station UE from the mobility management node MME # 2, and the mobile station UE has already stored “MDT Configuration”. In step S4004, “MDT Configuration # 2” is not transmitted to the mobile station UE.

The mobility management node MME # 2 receives a signal for notifying that “MDT Configuration” is already stored in the mobile station UE from the mobility management node MME # 1 or the operation and maintenance server OAM # 2. However, it is not necessary to transmit the “MDT Data Collection start instruction signal” addressed to the mobile station UE to the radio base station eNB # 2.
The characteristics of the present embodiment described above may be expressed as follows.

  The first feature of the present embodiment is a mobile communication method, in which the cell # 1 (first cell) under the radio access network RAN # 1 (first radio access network) is in the “RRC_Connected state (connection state)”. The process A for notifying the mobile station UE of “MDT Configuration # 1 (desired radio quality measurement method)” and the mobile station UE transits to the “RRC_Idle state (standby state)”, and “MDT Configuration # 1” ”Based on the method, the step B of measuring the desired radio quality, and the mobile station UE in the“ RRC_Idle state ”is cell # 2 (second cell) under the radio access network RAN # 2 (second radio access network). That manages cell # 2 when transiting to "RRC_Connected state" Against Chikyoku eNB # 2 (radio access network apparatus), the mobile station UE "MDT Configuration" already summarized in that a step C of notifying stored.

  In the first feature of the present embodiment, in step C, the mobile station UE may perform the above notification to the radio base station eNB # 2 by “MDT Configuration Indication”.

  In the first feature of the present embodiment, in step C, the mobility management node MME # 2 (upper node) performs the above-described notification in the “Initial Context Setup Procedure” to the radio base station eNB # 2. Also good.

  In the first feature of the present embodiment, the radio base station eNB # 2 does not have to notify the mobile station UE of “MDT Configuration # 1” when the above notification is performed.

  The second feature of the present embodiment is that the mobile station UE is configured to receive “MDT Configuration # 1” when it is in the “RRC_Connected state” in the cell # 1 under the control of the RAN # 1. After transitioning to the “RRC_Idle state” with the receiving unit 11, the measuring unit 13 configured to measure the desired radio quality based on “MDT Configuration # 1”, and the radio access network RAN # 2 When the cell # 2 transits from the “RRC_Idle state” to the “RRC_Connected state”, the radio base station eNB # 2 managing the cell # 2 is notified that the measurement method of the desired radio quality has already been stored The gist of the present invention is to include a transmission unit 15 configured to do so.

  A third feature of the present embodiment is the radio base station eNB, which is configured to notify the mobile station UE in the “RRC_Connected state” of “MDT Configuration” in the subordinate cell. When the transmission unit 22 receives a signal “MDT Configuration Indication” for notifying that “MDT Configuration” has already been stored from the mobile station UE, the transmitter 22 does not transmit “MDT Configuration”. It is summarized as follows.

  Note that the operations of the radio base station eNB, the mobile station UE, the operation and maintenance server OAM, and the mobility management node MME described above may be performed by hardware or may be performed by a software module executed by a processor. , Or a combination of both.

  The software module includes a RAM (Random Access Memory), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electronically Erasable and Programmable ROM, a hard disk, a registerable ROM, a hard disk). Alternatively, it may be provided in a storage medium of an arbitrary format such as a CD-ROM.

  Such a storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Such a storage medium and processor may be provided in the ASIC. Such an ASIC may be provided in the radio base station eNB, the mobile station UE, the operation and maintenance server OAM, or the mobility management node MME. Further, the storage medium and the processor may be provided as a discrete component in the radio base station eNB, the mobile station UE, the operation and maintenance server OAM, or the mobility management node MME.

  Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

UE ... mobile station eNB ... radio base station 11, 21 ... receiving unit 12 ... MDT Configuration storage unit 13 ... measurement unit 14, 23 ... MDT Log storage unit 15, 22 ... transmitting unit

Claims (6)

A step A for notifying a mobile station connected in the first cell under the first radio access network of a measurement method of desired radio quality;
Step B in which the mobile station transitions to a standby state and measures the desired radio quality based on the measurement method;
When the mobile station in the standby state transitions to the connected state in the second cell under the second radio access network, the mobile station manages the radio access network apparatus that manages the second cell with the desired radio quality. And a step C of notifying that the measurement method is already stored.   The mobile communication method according to claim 1, wherein in the step C, the mobile station performs the notification to the radio access network device.   The mobile communication method according to claim 1, wherein, in the step C, an upper node performs the notification to the radio access network device.   The said radio | wireless access network apparatus does not notify the measuring method of desired radio | wireless quality with respect to the said mobile station, when the said notification is performed, The movement as described in any one of Claim 1 thru | or 3 characterized by the above-mentioned. Communication method. A receiving unit configured to receive a measurement method of desired radio quality when connected in the first cell under the first radio access network; and
A measurement unit configured to measure the desired wireless quality based on the measurement method after transitioning to a standby state;
When the second cell under the second radio access network transitions from the standby state to the connected state, the radio access network device that manages the second cell has already stored the measurement method of the desired radio quality And a transmitter configured to notify the mobile station. A transmitter configured to notify a mobile station connected in a subordinate cell of a measurement method of desired radio quality;
The transmitter is configured not to transmit a desired radio quality measurement method when receiving a signal from the mobile station to notify that the desired radio quality measurement method is already stored. A wireless access network device characterized by the above.

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