JP2014171269A - Mobile communication method, mobile station and radio base station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a log of sufficient measurement results in consideration of the battery limit of a mobile station UE in a logged MDT mode.SOLUTION: A mobile communication method includes: a step A for transmitting individual information including a predetermined parameter from a radio base station to a mobile station in a connection state in a cell subordinate to the radio base station; and a step B for determining whether or not to perform peripheral cell measurement using radio quality in the cell and the predetermined parameter, when the mobile station is in an idle state. The radio base station notifies the mobile station of the predetermined parameter value determined on the basis of at least one of capability information and subscriber profile information of the mobile station.

Description

  The present invention relates to a mobile communication method, a mobile station, and a radio base station.

  In the LTE (Long Term Evolution) method, “MDT (Minimization of Drive Tests)” is defined. “MDT” is a concept in which the area quality measurement conventionally performed by an operator using a radio wave measuring vehicle or the like is substituted with a measurement report from the mobile station UE.

  Among such MDTs, in the Logged MDT mode, the mobile station UE performs measurement processing on the radio quality of the serving cell (serving cell) and the neighboring cells, and stores such measurement results as a log in the memory. When the wireless base station eNB is connected, the measurement results are collectively reported to the wireless base station eNB (that is, such a log is reported).

  Moreover, if there is position information, the mobile station UE logs the position information together with the above measurement result, and reports it to the radio base station eNB together with the above measurement result.

3GPP TS37.320

  However, in the conventional Logged MDT mode, the mobile station UE only performs measurement according to the parameters for measuring neighboring cells broadcast in the cell in the serving area, and the measurement result obtained by such measurement is stored in the designated log. It was only logged according to the method.

Here, the broadcast parameter includes a predetermined threshold S _search for the reception level (RSRP: Reference Signal Received Level) or reception quality (RSRQ: Reference Signal Received Quality) of the serving cell.

The mobile station UE needs to perform neighboring cell measurement only when RSRP (or RSRQ) is equal to or less than a predetermined threshold value S _search . Thereby, battery consumption can be suppressed.

The predetermined threshold value S _search is a parameter that is broadcast and is a parameter that is uniformly applied to all mobile stations UE in the cell. The value of the predetermined threshold S _search is normally set to a low value so that neighboring cell measurement is performed only at the cell edge in order to suppress battery consumption.

However, in MDT, it is desirable to be able to grasp the propagation status of various cells over a wide range, and it is desirable to be able to acquire a log of the results of measuring neighboring cells not only at the cell edge but in a wider range. Here, when the value of the predetermined threshold value S _search is set low, there is a problem that a sufficient log by MDT cannot be obtained.

  Therefore, the present invention has been made in view of the above-described problems, and in the Logged MDT mode, a mobile communication method capable of obtaining a sufficient measurement result log in consideration of battery restrictions of the mobile station UE, An object is to provide a mobile station and a radio base station.

  A first feature of the present invention is a mobile communication method, in which a radio base station transmits individual information including a predetermined parameter to a mobile station connected in a subordinate cell, and the mobile The gist of the present invention is to include a step B of determining whether or not to perform neighboring cell measurement using the radio quality in the cell and the predetermined parameter when the station is in an idle state.

  A second feature of the present invention is a mobile station configured to receive individual information including a predetermined parameter from a radio base station when the mobile station is in a connected state in a cell under the radio base station. An individual information receiving unit; and a determination unit configured to determine whether or not to perform neighboring cell measurement using the wireless quality in the cell and the predetermined parameter when in an idle state. This is the gist.

  A third feature of the present invention is a radio base station, and an individual information transmission unit configured to transmit individual information including a predetermined parameter to a mobile station connected in a subordinate cell, And a determination unit configured to determine a value of the predetermined parameter based on at least one of the capability information of the mobile station and subscriber profile information.

  As described above, according to the present invention, in the Logged MDT mode, a mobile communication method, a mobile station, and a radio base station that can obtain a sufficient measurement result log in consideration of the battery constraint of the mobile station UE Can be provided.

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 radio base station according to the first embodiment of the present invention. It is a figure which shows an example of the format of SIB3 used with the mobile communication system which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the format of "RRC Connection Release" used with the mobile communication system which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the format of "Logged Measurement Configuration" used with the mobile communication system which concerns on the 1st Embodiment of this invention. FIG. 3 is a functional block diagram of a mobile station according to the first embodiment of the present invention.

(Mobile communication system according to the first embodiment of the present invention)
With reference to FIG. 1 thru | or FIG. 6, the mobile communication system which concerns on the 1st Embodiment of this invention is demonstrated.

  The mobile communication system according to the present embodiment is an LTE mobile communication system, and includes radio base stations eNB # 1 to eNB # 3 as shown in FIG. Here, the cells # 1 to # 3 are under the radio base stations eNB # 1 to eNB # 3.

  Since the functions of the radio base stations eNB # 1 to # 3 are basically the same, hereinafter, the radio base stations eNB # 1 to # 3 are collectively referred to as “radio base station eNB”.

  As illustrated in FIG. 1, the radio base station eNB includes a determination unit 10, a broadcast information transmission unit 11, and an individual information transmission unit 12.

  The broadcast information transmission unit 11 is configured to transmit broadcast information such as MIB (Master Information Block) and SIB (System Information Block) 1 to 3 in cells under the radio base station eNB.

For example, the notification information transmission unit 11 is configured to transmit SIB3 including a predetermined threshold value S _Search as shown in FIG.

Here, when the mobile communication system according to the present embodiment is an LTE (Rel-9) mobile communication system, as the predetermined threshold S _Search , S _{IntraSearch RSRP} (“s-IntraSearch P-r9” in FIG. 3), S _{NonIntraSearchRSRP} ( "s-NonIntraSearchP-r9" in FIG. 3) _and, ( "s-IntraSearchQ-r9" in FIG. 3) _{S IntraSearchRSRQ and,} setting the _{S NonIntraSearchRSRQ} ( "s-NonIntraSearchQ-r9" in FIG. 3) Can do.

On the other hand, when the mobile communication system according to the present embodiment is an LTE (Rel-8) mobile communication system, S _{IntraSearch RSRP} or S _{NonIntraSearch RSRP} can be set as the predetermined threshold S _Search .

  The individual information transmission unit 12 is configured to transmit individual information such as “RRC Connection Release” and “Logged Measurement Configuration” to the mobile station UE in a connected state (connected state) in a cell under the radio base station eNB. Has been.

For example, as illustrated in FIG. 4, the individual information transmission unit 12 performs a predetermined parameter S _{Search / Dedicated} (FIG. 4) on the mobile station UE connected to the cell under the radio base station eNB by “RRC Connection Release”. In the case of “s-Search-r10”).

Here, as the predetermined parameter S _{Search / Dedicated} , S _{IntraSearch RSRP} (“s-IntraSearchP-v10x0” in FIG. 4), S _{IntraSearchRSRQ} (“s-IntraSearchQ-v10x0” in FIG. 4), S _NonInRP (S _NonInRP ) “S-NonIntraSearchP-v10x0”) and S _{NonIntraSearchRSRQ} (“s-NonIntraSearchQ-v10x0” in FIG. 4) can be set.

Similarly, as illustrated in FIG. 5, the individual information transmission unit 12 performs a predetermined parameter S _{Search / Dedicated} (for the mobile station UE connected in the cell under the radio base station eNB by a “Logged Measurement Configuration” (FIG. 5). 5 may be configured to notify “s-Search-r10”).

Here, as the predetermined parameter S _{Search / Dedicated} , S _{IntraSearch RSRP} (“s-IntraSearchP-v10x0” in FIG. 5), S _{IntraSearchRSRQ} (“s-IntraSearchQ-v10x0” in FIG. 5), S _NonInRP (S _NonInRP ) "S-NonIntraSearchP-v10x0") and S _{NonIntraSearchRSRQ} ("s-NonIntraSearchQ-v10x0" in FIG. 5) can be set.

Note that the value of the predetermined parameter S _{Search / Dedicated} included in the “RRC Connection Release” and “Logged Measurement Configuration” may be an absolute value or an offset with respect to the predetermined threshold S _Search included in the SIB3. It may be a value (difference value).

When the mobile station UE is in an idle state, the mobile station UE moves across a plurality of cells. Therefore, if the value of the predetermined parameter S _{Search / Dedicated} is set to an offset value with respect to the predetermined threshold S _Search , a difference in cell shape, etc. There may be a predetermined threshold value _{S Search} to be broadcast in each cell by reason if different, reflecting the differences between the predetermined threshold value _{S Search} for each cell.

The determination unit 10 is configured to determine the value of the predetermined parameter S _{Search / Dedicated} based on “UE Capability” and “SPID (Subscriber Profile for RAT / frequency priority)” of the mobile station UE.

Here, the determination unit 10 may set the value of the predetermined parameter S _{Search / Dedicated} to be larger than the predetermined threshold value S _Search .

For example, the determination unit 10 sets the value of the predetermined parameter S _{Search / Dedicated} for the mobile station UE (for example, the in-vehicle mobile station UE or the vending machine mounted mobile station UE) with less battery restrictions to be larger than the predetermined threshold S _Search. can do.

Further, the determination unit 10 can set the value of the predetermined parameter S _{Search / Dedicated} for the mobile station UE that sets the MDT to be larger than the predetermined threshold S _Search . In such a case, the individual information transmitting unit 12, only to the mobile station UE to perform MDT, notifies the predetermined parameter _{S Search / Dedicated,} to the mobile station UE does not perform MDT, the predetermined parameter _{S Search / Dedicated} By not using notification and using the predetermined threshold S _Search , it is possible to reduce battery consumption of the mobile station UE that does not perform MDT.

  In the LTE scheme, “UE Capability” is notified from the mobile station UE to the mobility management node MME via the radio base station eNBE # 1 when the mobile station UE is attached, and the mobile station UE is in an idle state. The mobility management node MME holds such “UE Capability”.

  Then, when the mobile station UE enters the connected state, the mobility management node MME notifies the radio base station eNB of this “UE Capability”.

  Here, when the radio base station eNB cannot obtain “UE Capability” from the mobility management node MME, the radio base station eNB can obtain “UE Capability” from the mobile station UE.

  Further, “SPID” is information that the mobility management node MME notifies the radio base station eNB when the mobile station UE enters a connected state. Here, “SPID” is an index that can be defined and used by the operator, such as a terminal type and a contract type.

  As illustrated in FIG. 6, the mobile station UE includes a broadcast information receiving unit 21, an individual information receiving unit 22, a determining unit 23, a measuring unit 24, and a Logged MDT performing unit 25.

The broadcast information receiving unit 21 is configured to receive broadcast information, for example, SIB3 including a predetermined threshold S _Search , in a cell in which the mobile station UE is in an idle state (Idle state).

The individual information reception unit 22 receives individual information, for example, “RRC Connection Release” including a predetermined parameter S _{Search / Dedicated} and “Logged Measurement Configuration” from the radio base station eNB # 1 that manages a cell in which the mobile station UE is in a connected state. Is received.

The determination unit 23 uses the radio quality (for example, RSRP, RSRQ, etc.) in the cell in which the mobile station UE is in an idle state and the predetermined threshold S _Search included in the SIB3 to perform the neighbor cell measurement (ie, the neighbor cell search and It is configured to determine whether or not (measurement of reception level / reception quality of detected neighboring cells) should be performed.

Specifically, a neighboring cell in which the same frequency as that cell is used is measured only when the RSRP in a cell in which the mobile station UE is in an idle state is lower than the S _IntraSearch RSRP included in the SIB3. It may be configured to determine that it should be the target.

Or, if the RSRQ in the cell in which the mobile station UE is in the idle state is lower than the predetermined threshold S _{IntraSearchRSRQ} included in the SIB3, the neighboring cell using the same frequency as the cell is used for the neighboring cell measurement. It may be configured to determine that it should be the target.

A neighboring cell in which a frequency (RAT: Radio Access Technology) different from the cell is used only when the RSRP in the cell in which the mobile station UE is in the idle state is lower than the predetermined threshold value S _{NonIntraSearchRSRP} included in the SIB3. May be determined to be the target of neighboring cell measurement.

Furthermore, only when the RSRQ in the cell in which the mobile station UE is in the idle state is lower than the predetermined threshold value S _{NonIntraSearchRSRQ} included in the SIB3, the neighboring cell using a different frequency (RAT) from the cell is designated as the neighboring cell. It may be configured to determine that it should be a measurement target.

  According to such a configuration, a mobile station UE in an idle state in a cell under the radio base station eNB can only receive a neighboring cell when the radio quality in the cell is lower than a predetermined threshold broadcast by the radio base station eNB. Since it is configured to perform measurement, it is possible to reduce battery consumption of the mobile station UE.

Further, when the predetermined parameter S _Search is acquired by the individual information receiving unit 22, the determination unit 23 determines the radio quality (for example, RSRP / RSRQ) and the predetermined parameter S _{Search /} in the cell in which the mobile station UE is in the idle state. _Dedicated is used to determine whether or not to perform neighboring cell measurement.

Here, when the value of the predetermined parameter S _{Search / Dedicated} is an absolute value, the determination unit 23 is configured to determine whether or not to perform neighboring cell measurement without using the predetermined threshold S _Search. May be.

On the other hand, when the value of the predetermined parameter S _{Search / Dedicated} is an offset value with respect to the predetermined threshold S _Search , the determination unit 23 determines the radio quality RSRP / RSRQ, the predetermined parameter S _{Search / Dedicated,} and the predetermined threshold S _Search in the cell # 1. May be used to determine whether or not to perform neighboring cell measurement.

Specifically, the same frequency as that cell is used only when the RSRP in the cell in which the mobile station UE is in an idle state is lower than the predetermined parameter S _IntraSearch RSRP included in “RRC Connection Release / Logged Measurement Configuration”. It may be configured to determine that a neighboring cell (for example, cell # 2) that is to be the subject of neighboring cell measurement.

Alternatively, the same frequency as that cell is used only when the RSRQ in the cell in which the mobile station UE is in an idle state is lower than the predetermined parameter S _{IntraSearchRSRQ} included in “RRC Connection Release / Logged Measurement Configuration”. The neighboring cell (for example, cell # 2) may be configured to determine that the neighboring cell should be measured.

Also, a frequency (RAT) different from that cell is used only when the RSRP in the cell in which the mobile station UE is in an idle state is lower than the predetermined parameter S _{NonIntraSearchRSRP} included in the “RRC Connection Release / Logged Measurement Configuration”. The neighboring cell (eg, cell # 3) may be configured to determine that it should be the subject of neighboring cell measurement.

Furthermore, a frequency (RAT) different from that cell is used only when the RSRQ in the cell in which the mobile station UE is in the idle state is lower than the predetermined parameter S _{NonIntraSearchRSRQ} included in the “RRC Connection Release / Logged Measurement Configuration”. The neighboring cell (eg, cell # 3) may be configured to determine that it should be the subject of neighboring cell measurement.

  The measurement unit 24 is configured to perform neighboring cell measurement based on the determination result of the determination unit 23. The measurement unit 24 is configured to measure the radio quality of the cell # 1.

  The Logged MDT execution unit 25 is configured to perform Logged MDT based on the measurement result by the measurement unit 24.

  For example, the Logged MDT execution unit 25 stores the measurement results for the radio quality (for example, RSRP / RSRQ) of the cell # 1 and the neighboring cells # 2 to # 3 measured by the measurement unit 24 as a log, and the cell # 1 Is configured to report a log to the radio base station eNb # 1 when a connection state is established.

According to the mobile communication system according to the first embodiment of the present invention, the mobile station UE uses the radio quality in the cell in the idle state and the predetermined parameter S included in the “RRC Connection Release” and “Logged Measurement Configuration”. Because it is configured to determine whether or not to perform neighbor cell measurement using _{Search / Dedicated} , i.e., when the radio quality in an idle cell is good, the neighbor cell measurement (i.e. Since it is not necessary to perform Logged MDT), battery consumption can be reduced.

Further, in the mobile communication system according to the first embodiment of the present invention, the value of the predetermined parameter S _{Search / Dedicated} in “RRC Connection Release / Logged Measurement Configuration” is set larger than the value of the predetermined threshold S _Search in SIB3. As a result, it is possible to expand the geographical range in which the neighboring cell measurement is performed, and it is possible to obtain more Logged MDT measurement results.

  This is because the neighbor cell measurement does not cause any trouble even if it is not performed if the radio quality in the cell in which the mobile station UE is in an idle state is good, but the Logged MDT is Originally, the reason is that the mobile station UE is preferably performed regardless of the quality of radio quality in a cell in an idle state.

  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 radio base station eNB # 1 includes a predetermined parameter S _{Search / Dedicated} for the mobile station UE in a connected state in the subordinate cell # 1 When the process A for transmitting the RRC message (individual information) and the mobile station UE are in the idle state, the neighboring cell measurement is performed using the radio quality RSRP / RSRQ and the predetermined parameter S _{Search / Dedicated} in the cell # 1. The gist of the present invention is to include a process B for determining whether or not to be performed.

In the first feature of the present embodiment, when the value of the predetermined parameter S _{Search / Dedicated} is an absolute value in the step B, the mobile station UE receives the SIB3 including the predetermined threshold S _Search from the radio base station eNB # 1. Even when (broadcast information) is received, it may be determined whether or not neighboring cell measurement should be performed without using the predetermined threshold value S _Search .

In the first feature of the present embodiment, when the value of the predetermined parameter S _{Search / Dedicated} is an offset value with respect to the predetermined threshold S _Search included in the SIB3 received from the radio base station eNb # 1 in step B, the mobile station The UE may determine whether or not to perform neighboring cell measurement using the radio quality RSRP / RSRQ, the predetermined parameter S _{Search / Dedicated} and the predetermined threshold S _Search in the cell # 1.

In the first feature of the present embodiment, in step A, the radio base station eNB # 1 sends a message “RRC Connection Release” to the mobile station UE to release an RRC connection with the mobile station UE. The predetermined parameter S _{Search / Dedicated} may be notified.

In the first feature of the present embodiment, in step A, the radio base station eNB # 1 uses the “Logged Measurement Configuration”, which is a message for causing the mobile station UE to perform Logged MDT, to set the predetermined parameter S _{Search. / Dedicated} may be notified.

In the first feature of the present embodiment, the radio base station eNB # 1 determines whether the predetermined parameter S _Search is based on at least one of “UE Capability (mobile station capability information)” and “SPID (subscriber profile information)”. There may be a step of determining a value of _{/ Dedicated} .

In the first feature of the present embodiment, the value of the predetermined parameter S _{Search / Dedicated} may be set to be larger than the predetermined threshold value S _Search .

The second feature of the present embodiment is the mobile station UE, which is in a connected state in the cell # 1 under the control of the radio base station eNB # 1 from the radio base station eNB # 1, and the predetermined parameter S _{Search / Dedicated.} And the individual information receiving unit 22 configured to receive the RRC message including the radio frequency RSRP / RSRQ in the cell # 1 and the predetermined parameter S _{Search / Dedicated} when the cell # 1 is in the idle state. And a determination unit 23 configured to determine whether or not to perform the above.

In the second feature of the present embodiment, the cell # 1 includes a broadcast information receiving unit 21 configured to receive the SIB3 including the predetermined threshold S _Search, and the value of the predetermined parameter S _{Search / Dedicated} is When it is an absolute value, the determination unit 23 may be configured to determine whether or not to perform neighboring cell measurement without using the predetermined threshold value S _Search .

In the second feature of the present embodiment, the cell # 1 includes a broadcast information receiving unit 21 configured to receive the SIB3 including the predetermined threshold S _Search, and the value of the predetermined parameter S _{Search / Dedicated} is If it is an offset value with respect to the predetermined threshold S _Search , the determination unit 23 should perform neighboring cell measurement using the radio quality RSRP / RSRQ in the cell # 1, the predetermined parameter S _{Search / Dedicated,} and the predetermined threshold S _Search. It may be configured to determine whether or not.

  In the second feature of the present embodiment, the individual information receiving unit 22 may be configured to receive “RRC Connection Release” as the RRC message described above.

  In the second feature of the present embodiment, the individual information receiving unit 22 may be configured to receive “Logged Measurement Configuration” as the RRC message described above.

The third feature of the present embodiment is the radio base station eNB # 1, which transmits an RRC message including a predetermined parameter S _{Search / Dedicated} to the mobile station UE connected in the subordinate cell # 1. An individual information transmission unit 12 configured as described above, and a determination unit 10 configured to determine a value of a predetermined parameter S _{Search / Dedicated} based on at least one of “UE Capability” and “SPID” The gist is to provide.

In the third feature of the present embodiment, the cell # 1 includes a broadcast information transmission unit 11 configured to transmit SIB3 including S _Search , and the determination unit 10 includes a predetermined parameter S _{Search / Dedicated} . The value may be set to be larger than a predetermined threshold value S _Search .

  Note that the operations of the radio base station eNB and the mobile station UE described above may be implemented by hardware, may be implemented by a software module executed by a processor, or may be implemented by 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 or the mobile station UE. Further, the storage medium and the processor may be provided as a discrete component in the radio base station eNB or the mobile station UE.

  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.

eNB ... radio base station 10 ... decision unit 11 ... broadcast information transmission unit 12 ... individual information transmission unit UE ... mobile station 21 ... broadcast information reception unit 22 ... individual information reception unit 23 ... determination unit 24 ... measurement unit 25 ... logged MDT implementation Part

Claims (8)

Step A in which a radio base station transmits individual information including a predetermined parameter to a mobile station connected in a subordinate cell;
A step B for determining whether or not to perform neighboring cell measurement using the radio quality in the cell and the predetermined parameter when the mobile station is in an idle state;
The mobile communication method, wherein the radio base station notifies the mobile station of a value of the predetermined parameter determined based on at least one of capability information of the mobile station and subscriber profile information.   In the step B, when the value of the predetermined parameter is an absolute value, the mobile station uses the predetermined threshold even when the mobile station receives broadcast information including the predetermined threshold from the radio base station. The mobile communication method according to claim 1, further comprising determining whether or not to perform the neighboring cell measurement.   In the step B, when the value of the predetermined parameter is an offset value with respect to a predetermined threshold included in the broadcast information received from the radio base station, the mobile station transmits the radio quality in the cell, the predetermined parameter, and the predetermined parameter. The mobile communication method according to claim 1, wherein it is determined whether or not the neighboring cell measurement should be performed using a threshold value.   The said base station notifies the said predetermined parameter to the said mobile station with the message for releasing the connection between this mobile station in the said process A, The Claim 1 thru | or 3 characterized by the above-mentioned. The mobile communication method according to any one of the above.   4. In the step A, the radio base station notifies the predetermined parameter by a message for causing the mobile station to perform predetermined measurement report processing. The mobile communication method according to item.   The mobile communication method according to claim 2 or 3, wherein the value of the predetermined parameter is set to be larger than the predetermined threshold. A wireless base station,
An individual information transmission unit configured to transmit individual information including predetermined parameters for neighboring cell measurement in the Logged MDT mode to a mobile station in a connected state in a subordinate cell;
The radio base station, wherein the individual information transmission unit notifies the mobile station of a value of the predetermined parameter determined based on at least one of capability information of the mobile station and subscriber profile information. In the cell, comprising a broadcast information transmitting unit configured to transmit broadcast information including a predetermined threshold,
The radio base station according to claim 7, wherein the individual information transmission unit sets the value of the predetermined parameter to be larger than the predetermined threshold.

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