JP2011120284A - Mobile communication method and mobile station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly transmit "entering/leaving proximity indication" while preventing the radio resources from wasting. <P>SOLUTION: The mobile station UE is configured so that if a predetermined time period has not elapsed since an "entering proximity indication" or "leaving proximity indication" is sent, the "entering proximity indication" is not sent even if having detected an entrance into a given area #1, and further "leaving proximity indication" is not sent, even if having detected an exit from the given area #1. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

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

  In a mobile communication system of LTE (Long Term Evolution), when a mobile station UE communicating in a macro cell detects that it has entered a predetermined area corresponding to a CSG (Closed Subscriber Group) cell managed as a fingerprint The radio base station eNB that transmits the “entering proximity indication” to the radio base station eNB that manages the macro cell and receives the “entering proximity indication” transmits a predetermined “measurement gap” to the mobile station UE. Is configured to transmit “MeasConfig” instructing to measure the radio quality in CSG cell # 1 of frequency F2.

  In addition, when the mobile station UE that is communicating in the macro cell detects that the mobile station UE has gone out of the predetermined area managed as fingerprint, the mobile station UE performs “leaving proximity indication” to the radio base station eNB that manages the macro cell. The radio base station eNB that has received the “leaving proximity indication” instructs the mobile station UE to stop measuring the radio quality in the CSG cell # 1 of the frequency F2 in the predetermined “measurement gap”. Is configured to transmit “MeasConfig”.

  Here, the CSG cell refers to a cell that can be accessed only by a specific mobile station UE. The mobile station UE confirms the broadcast information of each cell, and the CSG ID included in the broadcast information is stored in the mobile station UE. If it is included in the “allowed CSG list”, it is determined that it belongs to the CSG, and if it is not included, it is determined that it does not belong to the CSG.

  When the “CSG indication” included in the broadcast information is “TRUE”, only the mobile station UE belonging to the CSG is accessible, and when the “CSG indication” included in the broadcast information is “FALSE”, the CSG The mobile station UE to which it belongs becomes accessible with priority.

Japanese Patent Application No. 2008-076900

  However, in the above-described mobile communication system, the transmission conditions of “entering proximity indication” and “leaving proximity indication” by the mobile station UE are not clearly defined, and therefore, the mobile station UE makes “entering proximity indication” and “leaving proximity indication”. "Is frequently transmitted, and wireless resources may be wasted.

  Accordingly, the present invention has been made in view of the above-described problems, and a mobile communication method and a mobile that can appropriately transmit “entering proximity indication” and “leaving proximity indication” while preventing waste of radio resources The purpose is to provide a station.

The first feature of the present invention is that when a mobile station communicating with a cell of the first frequency detects that the mobile station enters a predetermined area corresponding to the second frequency, the cell of the first frequency is managed. Transmitting the first instruction information to the radio base station; and when the radio base station receives the first instruction information, the mobile station transmits the second frequency at a predetermined measurement interval. Transmitting a measurement configuration instructing to measure radio quality in the cell of the cell, and when detecting that the mobile station has gone out of the predetermined area, 2 When transmitting the instruction information, and when the radio base station receives the second instruction information, the mobile station performs radio quality measurement in the cell of the second frequency in the measurement interval. Send a measurement configuration that instructs you to abort Step D. In Step A, the mobile station responds to the second frequency when a predetermined period has not elapsed since the transmission of the first instruction information or the second instruction information. The mobile station does not transmit the first instruction information even if it is detected that it has entered the predetermined area, and the mobile station transmits the first instruction information or the second instruction information in the step C. If the predetermined period has not elapsed since then, the second instruction information is not transmitted even if it is detected that the vehicle has gone out of the predetermined area corresponding to the second frequency. And

  The second feature of the present invention is that a radio base station that manages a cell of the first frequency when it is detected that the mobile station has entered a predetermined area corresponding to the second frequency during communication in the cell of the first frequency. In response to the transmission, the transmission unit is configured to transmit the second instruction information to the radio base station when the first instruction information is transmitted and it is detected that the user has gone out of the predetermined area. And the transmitter has entered a predetermined area corresponding to the second frequency when a predetermined period has not elapsed since the transmission of the first instruction information or the second instruction information. Even when the first instruction information is detected, the first instruction information is not transmitted, and the predetermined period has elapsed since the transmission unit transmitted the first instruction information or the second instruction information. If not, the predetermined error corresponding to the second frequency is Even if it is detected that comes out of the A, and summarized in that is configured to not send the second indication information.

  As described above, according to the present invention, it is possible to provide a mobile communication method and a mobile station that can appropriately transmit “entering proximity indication” and “leaving proximity indication” while preventing waste of radio resources. it can.

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 UE according to the first embodiment of the present invention. 3 is a flowchart showing an operation of the mobile communication system according to the first embodiment of the present invention.

(Configuration of mobile communication system according to the first embodiment of the present invention)
With reference to FIG.1 and FIG.2, the structure of 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. As shown in FIG. 1, the mobile communication system includes a cell # of a frequency F1 managed by a radio base station eNB # A. A and CSG cell # 1 of frequency F2 managed by radio base station HeNB # 1 are arranged. Here, the CSG cell # 1 is arranged in the area of the cell #A.

  As illustrated in FIG. 2, the mobile station UE includes a management unit 11, a reception unit 12, a transmission unit 13, and a processing unit 14.

  The management unit 11 is configured to manage a predetermined area corresponding to the frequency of the CSG cell to which the mobile station UE has access rights. For example, in the present embodiment, the management unit 11 is configured to manage a predetermined area # 1 corresponding to the frequency F2 of the CSG cell # 1 to which the mobile station UE has an access right.

  The receiving unit 12 is configured to receive a signal transmitted by the radio base station eNB, for example, “MeasConfig (measurement configuration)”.

  The transmission unit 13 is configured to transmit a signal to the radio base station eNB.

  For example, when the transmission unit 13 detects that it has entered the predetermined area # 1 during communication in the cell #A having the frequency F1, the transmission unit 13 notifies the radio base station eNB # A of “entering proximity indication (first Instruction information) ”is transmitted.

  However, the transmission unit 13 transmits the “entering proximity indication” or “leaving proximity indication” when the predetermined period has not elapsed, that is, when the “Prohibited Timer (predetermined timer)” has not expired. Even when it is detected that the user has entered the predetermined area # 1, “entering proximity indication” is not transmitted.

  Here, “Prohibited Timer” is a timer that is started when “entering proximity indication” or “leaving proximity indication” is transmitted by the transmission unit 13.

  In addition, when the transmission unit 13 detects that the mobile station 13 has gone out of the predetermined area # 1 during communication in the cell #A having the frequency F1, the transmission unit 13 notifies the radio base station eNB # A of “leaving proximity indication (first 2 instruction information) ".

  However, if the predetermined period has not passed since the transmission unit 13 transmits “entering proximity indication” or “leaving proximity indication”, that is, if the “Prohibited Timer” has not expired, the predetermined area # Even when it is detected that the user has gone out of 1, the “leaving proximity indication” is not transmitted.

  Here, the predetermined area # 1 may be an area larger than the above-described CSG cell # 1, or may coincide with the above-described CSG cell # 1.

  The predetermined area # 1 (fingerprint) is information stored by the mobile station UE regarding the “peripheral environment” in which the above-described CSG cell # 1 exists. For example, the ID of a macrocell existing in the vicinity and a signal from the macrocell The information may be information based on a reception level, GPS information, or the like, or may be a location registration area ID, a PLMN ID, or the like, and what information is used may be implementation-dependent.

  When receiving the “MeasureConfiguration (measurement configuration)” including the predetermined “Measurement gap (measurement interval)” from the radio base station eNB # A, the processing unit 14 performs a cell search at the frequency F2 in the predetermined “Measurement gap”. When CSG cell # 1 is detected, its radio quality is measured.

  If the processing unit 14 receives “MeasConfig” from the radio base station eNB # A instructing to stop measuring the radio quality in the CSG cell # 1 of the frequency F2 in the predetermined “measurement gap”, Such cell search and radio quality measurement are stopped.

(Operation of the mobile communication system according to the first embodiment of the present invention)
With reference to FIG. 3, the operation of the mobile communication system according to the first embodiment of the present invention will be described.

  As shown in FIG. 3, in step S101, the radio access network E-UTRAN, that is, the radio base station eNB # A permits transmission of “entering / leaving proximity indication” by dedicated signaling.

  In step S101, the radio base station eNB # A notifies a range of PCI (Physical Cell Identity) that should receive SI (System Information).

  In step S102, the mobile station UE detects that it has entered a predetermined area (CSG cell) corresponding to a CSG cell managed as a fingerprint or has left the predetermined area. Here, it is assumed that the frequency F2 of the CSG cell is a non-serving frequency.

  In step S103, the mobile station UE determines whether or not “MeasConfig” for the frequency F2 is managed.

  If “YES”, the operation proceeds to step S107, and if “NO”, the operation proceeds to step S104.

  In step S104, the mobile station UE determines whether or not “Prohibited Timer” is being activated.

  If “YES”, the operation returns to step S102, and if “NO”, the operation proceeds to step S105.

  In step S105, the mobile station UE transmits “entering / leaving proximity indication” to the radio base station eNB # A.

  At this time, the mobile station UE transmits “entering / leaving proximity indication” including the frequency F2 of the CSG cell # 1. Moreover, the mobile station UE may transmit including the radio access scheme (RAT) of the CSG cell # 1.

  In step S106, the radio base station eNB # A transmits “MeasConfig” for the frequency F2 to the mobile station UE.

  In step S107, the mobile station UE measures the radio quality in the CSG cell # 1 of the frequency F2 in the “Measurement gap” included in the “MeasConfig” for the received frequency F2, and the cell for the CSG cell # 1. A search (cell search) process, a measurement (measurement) process, an SI receiving process (SI reading), and the like are performed.

  In step S108, the mobile station UE determines whether or not the SI has been successfully received when the transmission condition (for example, Event A3) of “Measurement Report (measurement report)” is satisfied.

  If “YES”, the operation proceeds to step S112. If “NO”, the operation proceeds to step S109.

  In Step S109, the mobile station UE includes, for the radio base station eNB # A, “Measurement Report” including “likely / unlikely indication” indicating whether the mobile station UE has an access right to the CSG cell # 1. ".

  The mobile station UE reports “likely” when the cell corresponding to the PCI reported in “Measurement Report” is assumed to be the cell of the CSG to which the mobile station UE belongs, and the mobile station UE If it is assumed that the cell does not belong to CSG, it is reported as “unlikely”.

  The mobile station UE may store the PCI information of the CSG cell as “fingerprint” information, and may infer “likely / unlikely” based on this information.

  In step S110, the radio base station eNB # A notifies the mobile station UE of a configuration for performing SI reception processing.

  In step S111, the mobile station UE performs SI reception processing based on “gap” notified from the radio base station eNB # A.

  In step S112, the mobile station UE transmits, to the radio base station eNB # A, "Member" indicating the result of CGI (Cell Global Identity), TAI (Tracking Area Identity), and "Preliminary access check" for the CSG cell # 1. “Measurement Report” including “/ non-member indication” is transmitted.

  The mobile station UE determines whether or not it belongs to the CSG of the cell from the CSG ID included in the received broadcast information SI, and if it belongs to the CSG of the cell, reports “member” to the CSG of the cell. If not, report “non-member”.

  In step S113, the radio access network E-UTRAN determines whether or not to perform the handover process of the mobile station UE based on the “Measurement Report”.

(Operations and effects of the mobile communication system according to the first embodiment of the present invention)
According to the mobile communication system according to the first embodiment of the present invention, the mobile station UE transmits a “entering proximity indication” or a “leaving proximity indication” after a predetermined period has passed, that is, “ If “Prohibited Timer” has not expired, “entering proximity indication” is not transmitted even if it is detected that it has entered the predetermined area # 1, and it has left the predetermined area # 1. Even when a “leaving proximity indication” is not transmitted, the mobile station UE sets “entering / leaving proximity indicator”. on "is sent frequently, it is possible to solve the problem that radio resources will be wasted.

  Moreover, since the radio base station eNB performs measurement control “MeasConfig” according to the received “entering / leaving proximity indication”, frequent measurement control can be avoided.

(Modification 1)
Hereinafter, the mobile communication system according to the first modification will be described by focusing on differences from the mobile communication system according to the first embodiment described above.

  In the mobile communication system according to the first modification, when the transmitter 13 of the mobile station UE detects that the mobile station UE has entered the predetermined area # 1 during communication in the cell #A of the first frequency F1, the radio base station You may be comprised so that "entering proximity indication" including PCI of CSG cell # 1 may be transmitted with respect to station eNB # A.

  However, the transmission unit 13 transmits the “entering proximity indication” or “leaving proximity indication” when the predetermined period has not elapsed, that is, when the “Prohibited Timer (predetermined timer)” has not expired. The “entering proximity indication” relating to the same RAT and frequency may not be transmitted.

  In addition, when the transmission unit 13 of the mobile station UE detects that the mobile station UE has gone out of the predetermined area # 1 during communication in the cell #A of the first frequency F1, the radio base station eNB # A “Leaving proximity indication” including the PCI of CSG cell # 1 may be transmitted.

  However, the transmission unit 13 transmits the “entering proximity indication” or “leaving proximity indication” when the predetermined period has not elapsed, that is, when the “Prohibited Timer (predetermined timer)” has not expired. The “leaving proximity indication” related to the same RAT and frequency may not be transmitted. According to the mobile communication system according to the first modification, the mobile station UE transmits, to the radio base station eNB # 1, the “entering proximity indication” and the “leaving proximity indication” including the PCI of the CSG cell # 1 having the access right. ", The radio base station eNB # A sends an" SI reporting request "requesting transmission of" SI reporting "for a CSG cell to which the mobile station UE does not have access rights. Sending can be avoided.

  In an LTE mobile communication system, in an inbound handover procedure to a CSG cell, a mobile station UE receives broadcast information transmitted in a handover destination cell (Target Cell), and transmits it to a communicating radio base station S-eNB. On the other hand, “CGI” of the handover destination cell, “TAI” of the handover destination cell, and “member / non-member indication” indicating whether it belongs to “CSG ID” broadcasted by the handover destination cell are transmitted. Is configured to do.

  Such an operation is called “SI (System Information) reporting”, and a signal for requesting the radio base station eNB # A to perform “SI reporting” to the mobile station UE is called “SI reporting request”.

  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 a mobile station UE communicating with a cell #A having a frequency F1 (first frequency) uses a frequency F2 (second frequency) CSG cell # 1. When it is detected that the mobile station has entered the predetermined area # 1 corresponding to the (specific cell), the radio base station eNB # A that manages the cell #A of the frequency F1 receives “entering proximity indication (first instruction information). ) ”And the radio base station eNB # A receives the“ entering proximity indication ”, the CSG of the frequency F2 with a predetermined“ measurement gap (predetermined measurement interval) ”is transmitted to the mobile station UE. Transmit “MeasConfig (measurement configuration)” instructing to measure the radio quality in cell # 1 Step B and a step of transmitting “leaving proximity indication (second instruction information)” to the radio base station eNB # A when the mobile station UE detects that the mobile station UE has left the predetermined area # 1. When C and the radio base station eNB # A receive “leaving proximity indication”, the mobile station UE stops measuring the radio quality in the CSG cell # 1 of the frequency F2 in the predetermined “measurement gap”. In step A, the mobile station UE transmits “entering proximity indication” or “leaving proximity indication” for a predetermined period of time after transmitting “MeasConfig” instructing If not (ie, if “Prohibited Timer” has not expired), even if it is detected that it has entered the predetermined area # 1, “entering proximity indication” is not transmitted, In step C, if the mobile station UE has not passed a predetermined period after transmitting “eating proximity indication” or “leaving proximity indication” (that is, if “Prohibited Timer” has not expired), The gist is that “leaving proximity indication” is not transmitted even when it is detected that the user has left the predetermined area # 1.

  In the first feature of the present embodiment, the predetermined period described above may be a fixed value or a value notified by the radio base station eNB # A via broadcast information or dedicated signaling.

  In the first feature of the present embodiment, in step A, the mobile station UE further “enters proximity indication” to the radio base station eNB # A when it does not have “MeasConfig” related to the frequency F2. May be sent.

  In the first feature of the present embodiment, in step C, when the mobile station UE further possesses “MeasConfig” related to the frequency F2, the “leaving proximity indication” is transmitted to the radio base station eNB # A. May be sent.

  In the first feature of the present embodiment, in step A, when the mobile station UE detects that it has entered the predetermined area # 1, it notifies the radio base station eNB # A in the CSG cell # 1. "Entering proximity indication" including PCI (cell identification information) used for the scramble process for the primary-SCH signal and the secondary-SCH signal (synchronization signal) to be transmitted may be transmitted.

  In the first feature of the present embodiment, in step C, when the mobile station UE detects that the mobile station UE has gone out of the predetermined area # 1, the mobile station UE sets the CSG cell # 1 to the radio base station eNB # A. A “leaving proximity indication” including PCI may be transmitted.

  The second feature of the present embodiment is that the mobile station UE detects the cell #A having the frequency F1 when detecting that the mobile station UE has entered the predetermined area # 1 during communication with the cell #A having the frequency F1. When “entering proximity indication” is transmitted to the radio base station eNB # A to be managed and it is detected that the user has gone out of the predetermined area # 1, the “leaving proximity” is transmitted to the radio base station eNB # A. The transmission unit 13 is configured to transmit the “indication”, and the transmission unit 13 has not passed the predetermined period since the “entering proximity indication” or the “leaving proximity indication” is transmitted (ie, "Prohibited Time ”Is not expired), even if it is detected that the user has entered the predetermined area # 1,“ entering proximity indication ”is not transmitted. When the predetermined period has not elapsed since the “entering proximity indication” or “leaving proximity indication” was transmitted (that is, when “Prohibited Timer” has not expired), the user has left the predetermined area # 1. Even if it is a case where it detects, it is set as the summary that it is comprised so that "leaving proximity indication" may not be transmitted.

  In the second feature of the present embodiment, the predetermined period may be a fixed value or a value notified by the radio base station eNB # A via broadcast information or dedicated signaling.

  In the second feature of the present embodiment, the transmitter 13 further transmits “entering proximity indication” to the radio base station eNB # A when it does not have “MeasConfig” related to the frequency F2. It may be configured.

  In the second feature of the present embodiment, the transmission unit 13 further transmits “leaving proximity indication” to the radio base station eNB # A when possessing “MeasConfig” related to the frequency F2. It may be configured.

  In the second feature of the present embodiment, when the transmitter 13 detects that it has entered the predetermined area # 1 during communication in the cell #A of the first frequency F1, the transmitter 13 transmits to the radio base station eNB # A. On the other hand, “entering proximity indication” including the PCI of CSG cell # 1 may be transmitted.

  In the second feature of the present embodiment, when the transmission unit 13 detects that it has gone out of the predetermined area # 1 during communication in the cell #A of the first frequency F1, the radio base station eNB # A On the other hand, “leaving proximity indication” including the PCI of CSG cell # 1 may be transmitted.

  The operations of the radio base station eNB / HeNB 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. Also good.

  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 / HeNB or the mobile station UE. Further, the storage medium and the processor may be provided in the radio base station eNB / HeNB or the mobile station UE as a discrete component.

  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, HeNB ... radio base station UE ... mobile station 11 ... management unit 12 ... receiving unit 13 ... transmitting unit 14 ... processing unit

Claims (1)

When a mobile station that is communicating with a cell of the first frequency detects that the mobile station enters a predetermined area corresponding to the specific cell using the second frequency, the mobile station that manages the cell of the first frequency Step A for transmitting the first instruction information;
When the radio base station receives the first instruction information, a step B of transmitting a measurement configuration instructing the mobile station to measure radio quality in the cell of the second frequency;
A step C of transmitting second instruction information to the radio base station when it is detected that the mobile station has gone out of the predetermined area;
A step D of transmitting a measurement configuration instructing the mobile station to stop measuring the radio quality in the cell of the second frequency when the radio base station receives the second instruction information; Comprising
In the step A, the mobile station detects that the mobile station has entered the predetermined area when a predetermined period has not elapsed since the transmission of the first instruction information or the second instruction information. Even if there is, the first instruction information is not transmitted,
In the step C, the mobile station detects that the mobile station has gone out of the predetermined area when the predetermined period has not elapsed since the transmission of the first instruction information or the second instruction information. Even if it is a case, the said 2nd instruction information is not transmitted, The mobile communication method characterized by the above-mentioned.