WO2009123235A1 - 移動通信方法、移動通信システム、プログラム、交換局及び特定無線基地局 - Google Patents
移動通信方法、移動通信システム、プログラム、交換局及び特定無線基地局 Download PDFInfo
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- WO2009123235A1 WO2009123235A1 PCT/JP2009/056745 JP2009056745W WO2009123235A1 WO 2009123235 A1 WO2009123235 A1 WO 2009123235A1 JP 2009056745 W JP2009056745 W JP 2009056745W WO 2009123235 A1 WO2009123235 A1 WO 2009123235A1
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- location registration
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- base station
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- mobile communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/02—Access restriction performed under specific conditions
- H04W48/04—Access restriction performed under specific conditions based on user or terminal location or mobility data, e.g. moving direction, speed
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- 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
- the present invention relates to a mobile communication method, a mobile communication system, a program, an exchange station, and a specific radio base station.
- CDMA Code Division Multiple Access
- W-CDMA Wideband-Code Division Multiple Access
- UMTS A mobile communication system called Universal Mobile Telecommunications System
- a W-CDMA mobile communication system includes a mobile station UE (User Equipment), a radio base station NodeB, a radio control station RNC (Radio Network Controller), and an exchange MSC / SGSN (Mobile).
- a cellular mobile communication system is configured with Switching Center / Serving GPRS Support Node. Such a cellular control unit is an area called a “cell”.
- a device for storing subscriber information called home memory is usually provided separately from the switching center, but in the example of FIG.
- the function shall be included in the switching center MSC / SGSN.
- radio base stations public radio base stations
- radio base stations wireless personal area networks
- the cells under the public radio base stations (radio base stations Node B02, Node B) 02 are called “macro cells (01, 02)”, and the cells under the femto radio base station (radio base station Node B03) are “ It is called “Femtocell (03)”.
- a femto radio base station is arranged in a general home, a small office, etc., and an inexpensive home IP line is applied to the connection with the radio control station RNC, so that a private area for a specific mobile station UE (Area formed by a single or a plurality of femtocells), and in such an area, a charging system in the femtocell is applied to the specific mobile station UE, or an additional function limited to the femtocell
- the “user-only service” that provides services is being studied.
- a mobile station UE in a “standby state” that is turned on but is not communicating, that is, waiting for an outgoing operation by a user's terminal operation or an incoming call by a call Measures the received power of the pilot signal transmitted for each cell via the CPICH (Common Pilot Channel) by the radio base station NodeB, and autonomously sends the optimal pilot signal (ie, the cell corresponding to the optimal pilot signal). Is configured to select. A description of such a selection algorithm is omitted.
- the mobile station UE that has selected the optimal pilot signal (that is, the cell corresponding to the optimal pilot signal) is configured to stand by in the cell. At this time, the mobile station UE is configured to perform location registration processing on the cell.
- step S5001 the mobile station UE compares the cell location number included in the broadcast information of the selected femtocell 03 with the cell location number stored in the mobile station UE.
- the mobile station UE ends this operation and continues waiting in the femtocell 03.
- the mobile station UE transmits a “RRC Connection Request message” to the radio control station RNC in steps S5002 and S5003, thereby communicating with the radio control station RNC.
- a “Routing Area Update Request message for requesting location registration processing for the location registration area (paging area) including the selected femtocell 03) to the switching center MSC / SGSN ( Send location registration request).
- step S5006 the switching center MSC / SGSN refers to the access list, and the femtocell 03 of the mobile station UE (femto radio base station NodeB03). It is determined whether or not access to is permitted.
- the switching center MSC / SGSN sends “Routing” to the mobile station UE. Send "Area Update Reject Message (Location Registration Rejection Response)".
- step S5008 switching center MSC / SGSN transmits an “IU Release Command message” to radio control station RNC, and in step S5009, the radio channel between radio control station RNC and mobile station UE is released. Is done.
- the mobile station UE that has been rejected for the location registration process as described above cannot enter the above-described standby state, and after a predetermined time has elapsed, the received power of the pilot signal that is transmitted for each cell again via the CPICH If the same femtocell 03 is selected again as the cell corresponding to the optimum pilot signal, the operation of FIG. 12 is repeated.
- the present invention has been made in view of the above-described problems, and provides a communication service other than the femtocell 03 to the mobile station UE that cannot enter the standby state in the femtocell 03.
- Mobile communication method, mobile communication system, program, switching station and identification that can improve battery convenience and increase convenience by avoiding repeated cell selection processing and location registration processing
- An object is to provide a radio base station.
- a first feature of the present invention is that a mobile station transmits a location registration request for requesting to perform location registration processing for a location registration area including a cell under a specific radio base station based on a received pilot signal.
- Step A in which the network device determines whether or not the mobile station is permitted to access the specific radio base station in response to the location registration request received from the mobile station; When it is determined that the access to the specific radio base station by the station is not permitted, the network device rejects the location registration process C, and the number of reject times of the location registration process exceeds a predetermined number
- the network device has a step D for determining to reduce the transmission power of the pilot signal in the specific radio base station. The gist.
- the network device accumulates the number of rejections of the location registration process, and if the location registration process is not rejected for a predetermined period, the accumulated number of rejections of the location registration process. May be cleared.
- the network device determines the pilot signal in the specific radio base station according to a communication status of a specific mobile station permitted to access the specific radio base station. It may be determined whether to reduce the transmission power.
- the number of rejections of the location registration process is a predetermined number of times. If it exceeds, the location registration process need not be rejected.
- the network device in the step C, includes a factor included in a location registration rejection response for notifying that the location registration processing is rejected according to the number of rejections of the location registration processing. May be changed.
- the network device determines the transmission power of the pilot signal in the specific radio base station according to the overlay status of other cells in the cell under the specific radio base station. You may determine whether it reduces.
- the network device may determine to return the transmission power of the pilot signal in the specific radio base station to an initial value after a predetermined period.
- a second feature of the present invention is that a mobile station transmits a location registration request for requesting to perform location registration processing for a location registration area including a cell under a specific radio base station based on a received pilot signal.
- a mobile communication system configured to determine whether the mobile station is permitted to access the specific radio base station according to the location registration request received from the mobile station.
- an access determination unit configured to reject the location registration process when it is determined that access to the specific radio base station by the mobile station is not permitted, and Deciding to reduce the transmission power of the pilot signal in the specific radio base station when the number of rejections of the location registration process exceeds a predetermined number
- it includes a change determination unit configured to so that.
- the number of refusals of the location registration process is accumulated, and if the location registration process is not rejected for a predetermined period, the accumulated number of rejects of the location registration process is cleared.
- the change determination unit determines the transmission power of the pilot signal in the specific radio base station according to a communication status of the specific mobile station permitted to access the specific radio base station. It may be configured to determine whether to reduce or not.
- the location registration processing unit may determine whether the location registration processing is rejected even when it is determined that the mobile station is not permitted to access the specific radio base station. If the predetermined number of times is exceeded, the location registration process may not be rejected.
- the location registration processing unit changes a factor included in a location registration rejection response for notifying that the location registration processing is rejected according to the number of rejections of the location registration processing. It may be configured as follows.
- the change determination unit determines whether to reduce the transmission power of the pilot signal in the specific radio base station according to an overlay situation of another cell in the cell under the specific radio base station. It may be configured to determine whether or not.
- the change determination unit may be configured to determine to return the transmission power of the pilot signal in the radio base station to an initial value after a predetermined period.
- a third feature of the present invention is a program that causes a computer to operate as a mobile communication system having the second feature of the present invention.
- a fourth feature of the present invention is that a mobile station transmits a location registration request for requesting to perform location registration processing for a location registration area including a cell under a specific radio base station, based on a received pilot signal. Whether or not the mobile station is permitted to access the specific radio base station according to the location registration request received from the mobile station.
- An access determination unit configured to determine whether or not the mobile station is not permitted to access the specific radio base station, and configured to reject the location registration process. When the number of refusals of the location registration processing unit and the location registration processing exceeds a predetermined number, the transmission power of the pilot signal in the specific radio base station is And summarized in that includes a change determination unit configured to determine to decrease.
- a fifth feature of the present invention is that a mobile station transmits a location registration request for requesting to perform location registration processing for a location registration area including a cell under a specific radio base station, based on a received pilot signal.
- a specific radio base station used in a mobile communication system configured to be configured to permit access to the specific radio base station by the mobile station according to the location registration request received from the mobile station.
- An access determination unit configured to determine whether or not the mobile station is not permitted to access the specific radio base station, and configured to reject the location registration process.
- the location registration processing unit and if the number of rejections of the location registration processing exceeds a predetermined number, the pilot signal transmission in the specific radio base station is performed.
- a change determination unit configured to determine to reduce power.
- FIG. 1 is a functional block diagram of a switching center according to the first embodiment of the present invention.
- FIG. 2 is a functional block diagram of the radio control station according to the first embodiment of the present invention.
- FIG. 3 is a sequence diagram showing an operation during the location registration process in the mobile communication system according to the first embodiment of the present invention.
- FIG. 4 is a flowchart showing an operation at the time of cumulative determination processing by the exchange according to the first embodiment of the present invention.
- FIG. 5 is a flowchart showing an operation at the time of cumulative counter clear processing by the exchange according to the first embodiment of the present invention.
- FIG. 6 is a flowchart showing an operation during the CPICH power reduction determination process by the radio control station according to the first embodiment of the present invention.
- FIG. 7 is a sequence diagram showing an operation during CPICH power recovery processing in the mobile communication system according to the first embodiment of the present invention.
- FIG. 8 is a flowchart showing an operation at the time of CPICH power recovery determination processing by the radio control station according to the first embodiment of the present invention.
- FIG. 9 is an overall configuration diagram of a mobile communication system according to Modification 1 of the present invention.
- FIG. 10 is an overall configuration diagram of a mobile communication system according to Modification 2 of the present invention.
- FIG. 11 is an overall configuration diagram of a general W-CDMA mobile communication system.
- FIG. 12 is a sequence diagram showing an operation at the time of location registration processing in a general W-CDMA mobile communication system.
- radio base stations NodeB01 and NodeB02 are installed by a communication carrier or the like and are public radio base stations that cover the macrocells 01 and 02 in an indoor space.
- the femto radio base station Node B03 is installed in a general home or small office by a general user, a communication carrier, or the like, and is an ultra-small radio base station that mainly covers the femto cell 03 in an indoor space. Shall.
- the femto radio base station Node B03 and the radio control station RNC01 may be configured to be connected via, for example, an inexpensive home IP line.
- the femto radio base station NodeB03 may be configured to provide a “user limited service” to a specific mobile station UE that can access the femto radio base station NodeB03.
- the femtocell 03 provides a charging system different from the charging system in the macro cell, or provides a limited additional function in the femtocell 03. Is done.
- the mobile communication system determines whether or not the location registration process of the mobile station UE is possible for a cell under the radio base station NodeB that can be set to either an open state (Open) or a closed state (Closed). It is configured as follows.
- a device for storing subscriber information called home memory, separately from the switching center MSC / SGSN.
- the home memory function is assumed to be included in the switching center MSC / SGSN.
- the exchange MSC / SGSN includes a location registration processing unit 11, an access determination unit 12, an accumulated counter information storage unit 13, and an accumulation determination unit 14. .
- the location registration processing unit 11 determines the location of the mobile station UE with respect to the location registration area including the cell under the radio base station NodeB specified by the “Routing Area Update Request message (location registration request)” transmitted from the mobile station UE. It is configured to perform a registration process.
- the mobile station UE measures the received power of the pilot signal received from each cell via the CPICH, and performs the location registration process for the location registration area including the cell corresponding to the pilot signal with the best received power. It is configured to send a “Routing Area Update Request message (location registration request)” for requesting.
- the access determination unit 12 It is determined whether or not the access to the femto radio base station Node B03 of the UE is permitted, that is, whether or not the location registration process is possible for the location registration area including the femto cell 03 under the femto radio base station Node B03 of the mobile station UE. It is configured.
- the location registration processing unit 11 selects the femto under the femto radio base station NodeB03 of the mobile station UE. The location registration process for the location registration area including the cell 03 is rejected.
- the location registration processing unit 11 when it is determined that the location registration processing for the location registration area including the femtocell 03 under the femto radio base station NodeB03 of the mobile station UE is rejected, the location registration processing unit 11 indicates “Routing Area Update” indicating that fact. “Reject message (location registration rejection response)” is configured to be transmitted to the radio network controller RNC.
- the location registration processing unit 11 Even if the access determination unit 12 determines that access to the specific radio base station of the mobile station UE is not permitted, the location registration processing unit 11 has a predetermined number of refusals for the location registration processing described above. When the number of times is exceeded, the location registration process may not be rejected.
- the location registration processing unit 11 includes factors included in the “Routing Area Update Reject message (location registration rejection response)” for notifying that the location registration processing is rejected according to the number of rejections of the location registration processing described above. (Cause) may be changed.
- the cause (Cause) indicates that it is rejected due to a temporary reason such as network congestion. After exceeding, it may indicate that the location registration process is rejected as the cause (Cause) because it is not allowed.
- the mobile station UE when the mobile station UE receives a “Routing Area Update Reject message (location registration rejection response)” including the former factor (Cause), the mobile station UE performs location registration processing for the location registration area including the same cell after a certain period of time. It is configured to repeat, and when a “Routing Area Update Reject message (location registration rejection response)” including the latter factor (Cause) is received, the location registration process for the location registration area including the same cell is not repeated. The position registration process may be performed on a position registration area including another cell.
- the cumulative counter information storage unit 13 is configured to store cumulative counter information that associates “mobile station identifier”, “cumulative counter”, and “clear timer” (see FIGS. 4 and 5).
- the “cumulative counter” indicates the number of times the location registration process is rejected for the location registration area including the cell (eg, femtocell 03) under the control of the specific radio base station of the mobile station UE identified by the “mobile station identifier”.
- “Clear timer” indicates a predetermined period, which is a time until the “cumulative counter (the number of rejected accumulated position registration processes)” is cleared when the above-described position registration process is not rejected.
- the accumulated counter information storage unit 13 stores a cell (eg, femtocell 03) under the control of a specific radio base station of the mobile station UE identified by the “mobile station identifier” for a predetermined period set in the “clear timer”.
- a cell eg, femtocell 03
- the number of rejections of the location registration process accumulated in the “accumulation counter” is cleared.
- the accumulation determination unit 14 is configured to perform an accumulation determination process which will be described later with reference to FIG.
- the location registration processing unit 11 is configured to include information indicating that in the “IU Release Command message (radio line release instruction)” and transmit the information to the radio control station RNC. .
- the location registration processing unit 11 is configured to transmit a normal “IU Release Command message (radio line release instruction)” to the radio control station RNC. Yes.
- the radio network controller RNC includes a radio network controller 21, a cell CPICH power information storage unit 22, a change determination unit 23, and a change instruction unit 24. .
- the radio channel control unit 21 is configured to set up or release a radio channel (for example, RRC connection) with the mobile station UE.
- a radio channel for example, RRC connection
- the cell CPICH power information storage unit 22 stores cell CPICH power information that associates “cell identifier”, “CPICH power”, “initial value”, “lower limit value”, “step width”, and “return timer”. It is configured.
- CPICH power indicates the current value of the pilot signal transmission power via the CPICH in the cell identified by the “cell identifier”
- initial value indicates the CPICH in the cell identified by the “cell identifier”.
- low limit value indicates the lower limit value of the pilot signal transmission power via the CPICH in the cell identified by the “cell identifier”.
- Step width indicates the reduction range of the transmission power of the pilot signal
- return timer indicates a predetermined period, which is a period until the transmission power of the pilot signal returns to the initial value.
- the change determination unit 23 detects from the received “IU Release Command message (radio line release instruction)” that the result of the cumulative determination process is “Yes”, the CPICH power described later with reference to FIG. It is configured to perform a reduction process.
- the change determination unit 23 determines whether or not to reduce the transmission power of the pilot signal via the CPICH in the specific radio base station (for example, the femto radio base station 03) according to the result of the CPICH power reduction process. It is configured as follows.
- the change determination unit 23 determines the transmission power of the pilot signal via the CPICH in the above-described specific radio base station (for example, the femto radio base station 03). It is configured to determine to reduce.
- the change determination unit 23 uses the CPICH in the specific radio base station according to the overlay status of other cells in the cell (for example, the femto cell 03) under the specific radio base station (for example, the femto radio base station 03). It may be configured to determine whether or not to reduce the transmission power of the pilot signal.
- the change determination unit 23 may be configured to determine to return the transmission power of the pilot signal to the initial value after a predetermined period has elapsed.
- the change instructing unit 24 indicates that The specific radio base station is instructed by using a “Cell Configuration Request message” or the like.
- the location of the mobile station UE with respect to the location registration area including the femtocell 03 under the femto radio base station 03 The operation when the registration process is rejected will be described.
- step S1001 the mobile station UE belongs to the position number (femtocell 03) of the cell (femtocell 03) included in the broadcast information of the cell corresponding to the pilot signal with the best received power.
- the paging area identifier is compared with the position number of the cell (macro cell 01) stored in the mobile station UE (the paging area identifier to which the cell 01 belongs).
- the mobile station UE ends this operation and continues waiting in the macro cell 01 that is currently performing location registration processing (waiting).
- the mobile station UE transmits a “RRC Connection Request message” to the radio control station RNC01 in steps S1002 and S1003, thereby communicating with the radio control station RNC01.
- a “Routing Area Update Request message (location registration request)” for requesting location registration processing for the location registration area including the femtocell 03 is sent to the switching center MSC / SGSN. Send.
- step S1005 after the authentication process for the mobile station UE is performed, in step S1006, the exchange MSC / SGSN determines whether or not the mobile station UE is permitted to access the femtocell 03.
- the switching center MSC / SGSN since access to the femtocell 03 of the mobile station UE is not permitted, the switching center MSC / SGSN performs an accumulation determination process in step S1007.
- the cumulative determination process will be described with reference to FIG.
- step S101 the cumulative determination unit 14 of the switching center MSC / SGSN reads the “mobile station identifier (# 1 in the example of FIG. 4) of the mobile station UE from the cumulative counter information storage unit 13. "Accumulation counter" corresponding to "is acquired.
- the cumulative counter information storage unit 13 increments the “cumulative counter” by one and then transmits it to the cumulative determination unit 14 (in the example of FIG. 4, the “cumulative counter” is changed from “4” to “5”. Incrementing).
- step S102 the cumulative determination unit 14 determines whether or not the acquired “cumulative counter” is equal to or greater than the “predetermined threshold”, that is, rejects location registration processing for the location registration area including the femtocell 03 of the mobile station UE. It is determined whether or not the number of times is a predetermined number or more.
- the “predetermined threshold value (predetermined number of times)” may be defined in advance as system data or the like, and may be physically stored in a memory, a hard disk, or the like, like the cumulative counter information.
- step S103 When it is determined that the “cumulative counter” is equal to or greater than the “predetermined threshold value”, the operation proceeds to step S103. When it is determined that the “cumulative counter” is not equal to or greater than the “predetermined threshold value”, the accumulation determination unit 14 The result of the accumulation determination process is “No”.
- step S103 the accumulation determination unit 14 determines whether or not a specific mobile station (home mobile station) permitted to access the above-described specific radio base station is communicating.
- the accumulation determination unit 14 sets the result of the accumulation determination process to “No”, and the specific mobile station (home mobile station) is not communicating. Is determined, the accumulation determination unit 14 sets the result of the accumulation determination process to “Yes”.
- the cumulative counter clear process for clearing the above “cumulative counter” will be described. Note that the cumulative counter clear process is started every second, for example, and is repeatedly performed for all mobile stations UE.
- step S201 the cumulative counter information storage unit 13 decreases the count of the “clear timer” corresponding to the “mobile station identifier” of the corresponding mobile station UE.
- step S202 if the “clear timer” has not expired, that is, if the “clear timer” is not “0”, the accumulated counter information storage unit 13 ends the accumulated counter clear process for the mobile station UE. Then, the cumulative counter clear process for the next mobile station UE is started.
- step S203 the cumulative counter information storage unit 13 stores the mobile station UE. After clearing the “cumulative counter” and changing the “clear timer” to the “unset state”, the cumulative counter clear process for the mobile station UE is terminated and the cumulative counter clear process for the next mobile station UE is started. .
- step S1008A when the result of the cumulative determination process is “No”, the exchange MSC / SGSN sends a “Routing Area Update Reject message (location registration rejection response)” to the mobile station UE in step S1008A.
- step S1009A an “IU Release Command message” is transmitted to the femto radio base station 03.
- step S1010A the radio channel established between the radio control station RNC and the mobile station UE is released. To do.
- the switching center MSC / SGSN transmits a “Routing Area Update Reject message (location registration rejection response)” to the mobile station UE in Step S1008B.
- a “Routing Area Update Reject message location registration rejection response”
- an “IU Release Command message” is sent to the femto radio base station 03 to notify that the result of the accumulation determination process is “Yes”.
- the radio control station RNC and the mobile station UE Open the wireless link established with the.
- step S1011 the change determination unit 23 of the radio network controller RNC performs CPICH power reduction determination processing according to the “IU Release Command message” in step S1009B.
- CPICH power reduction determination process will be described with reference to FIG.
- step S301 the change determination unit 23 of the radio network controller RNC changes the cell CPICH power information storage unit 22 to “cell identifier (# 1 in the example of FIG. 6)” of the femto cell 03.
- cell identifier # 1 in the example of FIG. 6
- step width 2 dBm in the example of FIG. 6)
- the change determination unit 23 resets the “return timer” corresponding to the “cell identifier” (in the example of FIG. 6, the reset value is reset from 15 seconds to the initial value of 180 seconds).
- the change determination unit 23 sets the “return timer” to an initial value (for example, 180 seconds).
- step S302 the change determination unit 23 determines whether or not the value obtained by subtracting the “step width” from the acquired “CPICH power” is equal to or greater than the “lower limit value”.
- step S303 If it is determined that the value is not less than the “lower limit value”, the operation proceeds to step S303. If it is determined that the value is not not less than the “lower limit value”, the change determination unit 23 sets the result of the CPICH power reduction determination process to “No”. "
- step S303 the change determination unit 23 determines whether there is a different frequency cell overlaid on the femtocell 03.
- the change determination unit 23 guides the mobile station UE to the different frequency cell, so that the mobile station UE does not have to reduce the transmission power of the pilot signal in the femtocell 03. It is determined that there is a possibility that a communication service can be provided, and the result of the CPICH power reduction determination process is set to “No”.
- the change determination unit 23 may be configured to specify to the mobile station UE so as to perform standby at the different frequency when the radio line is released.
- the presence / absence of the different frequency cell may be stored in advance in the station data of the radio control station RNC.
- the change determination unit 23 sets the result of the CPICH power reduction determination process to “Yes”.
- the change determination unit 23 updates the “CPICH power” in the cell CPICH power information storage unit 22 when the “Cell Reconfiguration Response message (cell reconfiguration response)” from the femto radio base station 03 is received.
- the femto radio base station 03 performs this operation without changing the transmission power of the pilot signal in the femtocell 03 in step S1012A. Ends.
- the radio control station RNC transmits the pilot signal transmission power in the femtocell 03 to the femtocell 03 in step 1012B.
- a “Cell Reconfiguration Request message (cell reconfiguration request)” instructing reduction by “step width” is transmitted.
- step S1013B the femto radio base station 03 reduces the transmission power of the pilot signal in the femtocell 03 by the above-described “step width”, and then in step S1014B, the “Cell Reconfiguration Response message” is sent to the radio control station RNC. (Cell reconfiguration response) "is transmitted.
- the transmission power of the pilot signal via the CPICH in the femto cell 03 subordinate to the femto radio base station 03 is The operation for returning will be described.
- step S2001 the radio network controller RNC determines whether or not to restore the pilot signal transmission power via CPICH in the femtocell 03 under the femto radio base station 03. Perform a return judgment process.
- the CPICH power recovery determination process will be described with reference to FIG. Note that the CPICH power recovery determination process is started, for example, every second and is repeated for all cells.
- step 401 the CPICH power information storage unit 22 decreases the count of the “recovery timer” corresponding to the “cell identifier” of the corresponding cell.
- step S402 if the “recovery timer” has not expired, that is, if the “recovery timer” is not “0”, the CPICH power information storage unit 22 displays the result of the CPICH power recovery determination process for the cell. “No” is set, and the CPICH power recovery determination process for the next cell is started.
- step S402 when the “recovery timer” has expired in step S402, that is, when the “recovery timer” is “0”, the CPICH power information storage unit 22 performs the CPICH power recovery determination process for the cell. The result is “Yes”, and the CPICH power recovery determination process for the next cell is started.
- the change determination unit 23 determines that the result of the CPICH power recovery determination process is “Yes”, and the “Cell Reconfiguration Response message (indicating that the transmission power of the pilot signal via the CPICHI in the cell has been returned to the initial value”.
- the cell CPICH power information storage unit 22 sets “CPICH power” of the femtocell 03 to “initial value” and “Return timer” is changed to “unset state”.
- step S2002A when the result of the CPICH power recovery determination process is “No”, in step S2002A, the femto radio base station 03 performs this operation without returning the pilot signal transmission power in the femtocell 03 to the initial value. Ends.
- the radio control station RNC transmits the pilot signal in the femtocell 03 to the femto radio base station 03 in step 2002B.
- a “Cell Reconfiguration Request message (cell reconfiguration request)” instructing to return the power to the “initial value” is transmitted.
- step S2003B the femto radio base station 03 returns the transmission power of the pilot signal in the femtocell 03 to the “initial value”, and in step S2 04B, the femto radio base station 03 sends a “Cell Reconfiguration Response message ( Cell reconfiguration response) ".
- the cell CPICH power information storage unit 22 holds the “initial value”, “lower limit value”, “step width”, and “return timer” individually as numerical values.
- a “type number” may be assigned to a typical set of numerical values, and a “type number” may be associated with each “cell identifier” and retained. Such type numbers and sets may be remotely changeable during operation of the mobile communication system.
- the mobile communication system it is possible to save battery of the mobile station UE and improve convenience while avoiding repetition of cell selection processing and location registration processing. Can do.
- the mobile communication system is configured to clear the number of refusals of the location registration process for the location registration area including the femtocell 03 of the mobile station UE after a predetermined period has elapsed. Therefore, the trade-off relationship between the provision of the communication service to the mobile station UE that cannot enter the standby state in the femtocell 03 and the coverage of the femtocell 03 can be easily and flexibly controlled.
- the transmission power of the pilot signal in the femtocell 03 is not reduced.
- the communication quality in the femtocell 03 of the specific mobile station can be ensured.
- the location registration process is infinite for the location registration area including the femtocell 03 by the mobile station UE that cannot enter the standby state in the femtocell 03. Battery waste due to repetition can also be avoided.
- the femtocell 03 when a mobile station UE that cannot enter a standby state in the femtocell 03 can be guided to a different frequency cell that overlays the femtocell 03, the femtocell 03 By not reducing the transmission power of the pilot signal in the cell 03, it is possible to avoid a concern that the coverage of the femtocell 03 is unnecessarily impaired.
- the coverage of the femtocell 03 is widened. Can be returned.
- the pilot signal transmission power in the femtocell 03 can be restored to the original by remote control, so that the coverage of the femtocell 03 can be achieved quickly and efficiently. Can be changed.
- the W-CDMA mobile communication system is described as an example.
- the present invention is not limited to such a mobile communication system.
- the present invention is also applicable to a (Long Term Evolution) type mobile communication system.
- the function of the radio base station NodeB and the function of the radio control station RNC are mounted on the radio base station eNB.
- the change determination unit 23 provided in the radio control station RNC in the above-described embodiment may be provided in the radio base station eNB in the present modification.
- the access determination unit 12 provided in the exchange MSC / SGSN in the above-described embodiment may be included in the radio base station eNB or the aggregation device HNB-GW in the present modification. .
- Modification 2 a mobile communication system according to Modification 2 of the present invention will be described with reference to FIG.
- the mobile communication system according to the modified example 2 of the present invention will be described by focusing on differences from the mobile communication system according to the first embodiment described above.
- the change determination unit 23 provided in the radio control station RNC in the above-described embodiment may be provided in the radio base station NodeB in this modification.
- the access determination unit 12 provided in the exchange MSC / SGSN in the above-described embodiment is changed to the radio base station NodeB, the aggregation device HNB-GW, or the exchange MSC / SGSN in the present modification. It may be provided.
- the operations of the mobile station UE, radio base station (femto radio base station) NodeB (eNB), exchange MSC / SGSN (MME), radio control station RNC, and aggregation device HNB-GW are implemented by hardware. Alternatively, it may be implemented by a software module executed by a processor, or may be implemented by a combination of both.
- the software modules include RAM (Random Access Memory), flash memory, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electronically Erasable and Programmable, Removable ROM, Hard Disk, and Removable ROM).
- RAM Random Access Memory
- flash memory ROM (Read Only Memory)
- EPROM Erasable Programmable ROM
- EEPROM Electrically Erasable and Programmable, Removable ROM, Hard Disk, and Removable ROM.
- 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. Further, such a storage medium and a processor may be provided in the ASIC. Such an ASIC may be provided in the mobile station UE, the radio base station NodeB (eNB), the exchange MSC / SGSN (MME), the radio control station RNC, or the aggregation device HNB-GW. Further, the storage medium and the processor may be provided as a discrete component in the mobile station UE, the radio base station eNB, the exchange MME, the radio control station RNC, or the aggregation device HNB-GW.
- a communication service other than the femtocell 03 it is possible to provide a communication service other than the femtocell 03 to the mobile station UE that cannot enter the standby state in the femtocell 03 while performing cell selection.
- a mobile communication method, a mobile communication system, a program, an exchange station, and a specific radio base station that can improve the convenience by saving battery of the mobile station UE by avoiding repetition of processing and location registration processing be able to.
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Abstract
Description
図1及び図2を参照して、本発明の第1の実施形態に係る移動通信システムの構成について説明する。なお、図1に示すように、本実施形態に係る移動通信システムの構成は、上述した図11に示す構成と同様である。
図3乃至図8を参照して、本発明の第1の実施形態に係る移動通信システムの動作について説明する。
本発明の第1の実施形態に係る移動通信システムによれば、フェムトセル03において待ち受け状態となることができない移動局UEに対して、フェムトセル03以外での通信サービスを提供可能にし、サービス性を向上させることができる。
上述の実施形態では、W-CDMA方式の移動通信システムを例に挙げて説明されているが、本発明は、かかる移動通信システムに限定されるものではなく、例えば、図9に示すよう、LTE(Long Term Evolution)方式の移動通信システムにも適用可能である。
以下、本発明の変更例2に係る移動通信システムについて、図10を参照して説明する。ここで、本発明の変更例2に係る移動通信システムについて、上述の第1の実施形態に係る移動通信システムとの相違点に着目して説明する。
Claims (17)
- 移動局が、受信したパイロット信号に基づいて、特定無線基地局配下のセルを含む位置登録エリアに対する位置登録処理を行うように要求するための位置登録要求を送信する工程Aと、
ネットワーク装置が、前記移動局から受信した前記位置登録要求に応じて、該移動局の前記特定無線基地局に対するアクセスが許可されているか否かについて判定する工程Bと、
前記移動局の前記特定無線基地局に対するアクセスが許可されていないと判定された場合、前記ネットワーク装置が、前記位置登録処理を拒否する工程Cと、
前記位置登録処理の拒否回数が所定回数を超えた場合に、前記ネットワーク装置が、前記特定無線基地局における前記パイロット信号の送信電力を低減するように決定する工程Dとを有することを特徴とする移動通信方法。 - 前記ネットワーク装置は、前記位置登録処理の拒否回数を累積しており、所定期間、前記位置登録処理が拒否されない場合、累積している該位置登録処理の拒否回数をクリアすることを特徴とする請求項1に記載の移動通信方法。
- 前記工程Dにおいて、前記ネットワーク装置は、前記特定無線基地局に対するアクセスが許可されている特定移動局の通信状況に応じて、該特定無線基地局における前記パイロット信号の送信電力を低減するか否かについて判定することを特徴とする請求項1に記載の移動通信方法。
- 前記ネットワーク装置は、前記移動局の前記特定無線基地局に対するアクセスが許可されていないと判定された場合であっても、前記位置登録処理の拒否回数が所定回数を超えている場合には、前記位置登録処理を拒否しないことを特徴とする請求項1に記載の移動通信方法。
- 前記工程Cにおいて、前記ネットワーク装置は、前記位置登録処理の拒否回数に応じて、該位置登録処理を拒否することを通知するための位置登録拒否応答に含める要因を変更することを特徴とする請求項1に記載の移動通信方法。
- 前記工程Dにおいて、前記ネットワーク装置は、前記特定無線基地局配下のセルにおける他セルのオーバレイ状況に応じて、該特定無線基地局における前記パイロット信号の送信電力を低減するか否かについて判定することを特徴とする請求項1に記載の移動通信方法。
- 前記ネットワーク装置は、所定期間経過後に、前記特定無線基地局における前記パイロット信号の送信電力を初期値に戻すこと決定することを特徴とする請求項1に記載の移動通信方法。
- 移動局が、受信したパイロット信号に基づいて、特定無線基地局配下のセルを含む位置登録エリアに対する位置登録処理を行うように要求するための位置登録要求を送信するように構成されている移動通信システムであって、
前記移動局から受信した前記位置登録要求に応じて、該移動局の前記特定無線基地局に対するアクセスが許可されているか否かについて判定するように構成されているアクセス判定部と、
前記移動局の前記特定無線基地局に対するアクセスが許可されていないと判定された場合、前記位置登録処理を拒否するように構成されている位置登録処理部と、
前記位置登録処理の拒否回数が所定回数を超えた場合に、前記特定無線基地局における前記パイロット信号の送信電力を低減するように決定するように構成されている変更判定部とを具備することを特徴とする移動通信システム。 - 前記位置登録処理の拒否回数を累積しており、所定期間、前記位置登録処理が拒否されない場合、累積している該位置登録処理の拒否回数をクリアするように構成されている記憶部を具備することを特徴とする請求項8に記載の移動通信システム。
- 前記変更判定部は、前記特定無線基地局に対するアクセスが許可されている特定移動局の通信状況に応じて、該特定無線基地局における前記パイロット信号の送信電力を低減するか否かについて判定するように構成されていることを特徴とする請求項8に記載の移動通信システム。
- 前記位置登録処理部は、前記移動局の前記特定無線基地局に対するアクセスが許可されていないと判定された場合であっても、前記位置登録処理の拒否回数が所定回数を超えている場合には、前記位置登録処理を拒否しないように構成されていることを特徴とする請求項8に記載の移動通信システム。
- 前記位置登録処理部は、前記位置登録処理の拒否回数に応じて、該位置登録処理を拒否することを通知するための位置登録拒否応答に含める要因を変更するように構成されていることを特徴とする請求項8に記載の移動通信システム。
- 前記変更判定部は、前記特定無線基地局配下のセルにおける他セルのオーバレイ状況に応じて、該特定無線基地局における前記パイロット信号の送信電力を低減するか否かについて判定するように構成されていることを特徴とする請求項8に記載の移動通信システム。
- 前記変更判定部は、所定期間経過後に、前記無線基地局における前記パイロット信号の送信電力を初期値に戻すことを決定するように構成されていることを特徴とする請求項8に記載の移動通信システム。
- コンピュータを、請求項8乃至14のいずれか一項に記載の移動通信システムとして動作させることを特徴とするプログラム。
- 移動局が、受信したパイロット信号に基づいて、特定無線基地局配下のセルを含む位置登録エリアに対する位置登録処理を行うように要求するための位置登録要求を送信するように構成されている移動通信システムで用いられる交換局であって、
前記移動局から受信した前記位置登録要求に応じて、該移動局の前記特定無線基地局に対するアクセスが許可されているか否かについて判定するように構成されているアクセス判定部と、
前記移動局の前記特定無線基地局に対するアクセスが許可されていないと判定された場合、前記位置登録処理を拒否するように構成されている位置登録処理部と、
前記位置登録処理の拒否回数が所定回数を超えた場合に、前記特定無線基地局における前記パイロット信号の送信電力を低減するように決定するように構成されている変更判定部とを具備することを特徴とする交換局。 - 移動局が、受信したパイロット信号に基づいて、特定無線基地局配下のセルを含む位置登録エリアに対する位置登録処理を行うように要求するための位置登録要求を送信するように構成されている移動通信システムで用いられる特定無線基地局であって、
前記移動局から受信した前記位置登録要求に応じて、該移動局の前記特定無線基地局に対するアクセスが許可されているか否かについて判定するように構成されているアクセス判定部と、
前記移動局の前記特定無線基地局に対するアクセスが許可されていないと判定された場合、前記位置登録処理を拒否するように構成されている位置登録処理部と、
前記位置登録処理の拒否回数が所定回数を超えた場合に、前記特定無線基地局における前記パイロット信号の送信電力を低減するように決定するように構成されている変更判定部とを具備することを特徴とする特定無線基地局。
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US8452282B2 (en) | 2013-05-28 |
EP2273832B1 (en) | 2014-08-13 |
EP2273832A4 (en) | 2013-11-06 |
US20110117913A1 (en) | 2011-05-19 |
JP4740395B2 (ja) | 2011-08-03 |
JP2011172269A (ja) | 2011-09-01 |
CN101983533B (zh) | 2013-07-31 |
JPWO2009123235A1 (ja) | 2011-07-28 |
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