JP4302112B2 - Mobile communication method, radio base station, and radio network controller - Google Patents

Description

  The present invention relates to a radio resource management method, a radio base station, and a radio network controller for managing radio resources for transmitting user data via an uplink by a mobile station.

  In the conventional mobile communication system, the radio network controller RNC, in the uplink from the mobile station UE to the radio base station NodeB, the radio resources of the radio base station NodeB, the interference amount in the uplink, the transmission power of the mobile station UE, In consideration of the transmission processing performance of the mobile station UE, the transmission rate required by the upper application, etc., the transmission rate of the dedicated channel is determined, and the mobile station UE and the radio are transmitted by a layer 3 (Radio Resource Control Layer) message. Each base station NodeB is configured to notify the determined transmission rate of the dedicated channel.

  Here, the radio network controller RNC is an apparatus that exists above the radio base station NodeB and controls the radio base station NodeB and the mobile station UE.

  In general, in data communication, traffic often occurs in a burst manner as compared with voice calls and TV calls. Originally, it is desirable to change the transmission speed of a channel used for data communication at a high speed.

  However, as shown in FIG. 11, the radio network controller RNC normally controls a number of radio base stations NodeB in an integrated manner. Therefore, in a conventional mobile communication system, due to reasons such as processing load and processing delay. There is a problem that it is difficult to control the change of the transmission speed of a high-speed channel (for example, about 1 to 100 ms).

  In addition, in the conventional mobile communication system, there is a problem that even if the high-speed channel transmission rate change control can be performed, the device mounting cost and the network operation cost are significantly increased.

  For this reason, in a conventional mobile communication system, it is usual to perform channel transmission rate change control in the order of several hundreds ms to several s.

  Therefore, in the conventional mobile communication system, as shown in FIG. 12 (a), when performing bursty data transmission, as shown in FIG. 12 (b), low speed, high delay and low transmission efficiency are allowed. As shown in FIG. 12 (c), radio resources for high-speed communication are secured and radio resources in idle time and hardware resources in the radio base station NodeB are wasted. Data is transmitted with permission.

  However, in FIG. 12, it is assumed that both the above-described radio band resource and hardware resource are applied to the radio resource on the vertical axis.

  Therefore, in “3GPP” and “3GPP2”, which are international standardization organizations of the third generation mobile communication system, in order to effectively use radio resources, the layer 1 and the MAC sublayer between the radio base station NodeB and the mobile station UE ( High-speed radio resource control methods in layer 2) have been studied. Hereinafter, such a study or a function that has been studied will be collectively referred to as an “uplink enhancement (EUL)”.

  In the “3GPP” standard, the cell is configured to transmit a transmission rate (Grant) for user data in the uplink to the mobile station UE.

  Each mobile station UE is configured to have one “serving cell” in the radio base station NodeB that receives the “Absolute Grant (absolute transmission rate)” via the AGCH at any time. .

  Here, “Absolute Grant” provides an absolute value of the upper limit of the maximum resource (transmission rate) in the uplink that can be used by the mobile station.

  Further, the mobile station UE may be configured to receive a “relative grant (relative transmission rate)” that increases or decreases the upper limit of the resource from a value used previously.

  The mobile station UE may be configured to receive “Relativ Grant” not only from the serving cell of the mobile station UE but also from a non-serving cell.

  A cell in the radio base station NodeB regards a mobile station having the cell as a serving cell as a “serving mobile station”. A radio link (E-DCH) established between the mobile station and the cell is referred to as a “serving radio link (serving E-DCH)”.

  On the other hand, a cell in the radio base station NodeB regards a mobile station having the cell as a non-serving cell as a “non-serving mobile station”. A radio link (E-DCH) established between the mobile station and the cell is referred to as a “non-serving radio link (non-serving E-DCH)”.

  Conventionally, radio resource control methods that have been studied in “uplink enhancement” can be broadly classified into three as follows. Hereinafter, this radio resource control method will be outlined.

  First, a radio resource control method called “Time & Rate Control” has been studied.

  In this radio resource control method, the radio base station NodeB determines a mobile station UE that permits transmission of user data and a transmission rate of user data at each predetermined timing, and together with the mobile station ID, a transmission rate of user data ( Alternatively, information on the maximum allowable transmission rate of user data) is broadcast.

  Then, the mobile station UE designated by the radio base station NodeB transmits user data at the designated timing and transmission rate (or within the range of the maximum allowable transmission rate).

  Secondly, a radio resource control method called “Rate Control per UE” has been studied.

  In this radio resource control method, each mobile station UE can transmit the user data if there is user data to be transmitted to the radio base station NodeB. However, the maximum allowable transmission rate of the user data is determined for each transmission frame. Alternatively, for each of a plurality of transmission frames, one determined by the radio base station NodeB and notified to each mobile station UE is used.

  Here, when the radio base station NodeB notifies the maximum permissible transmission rate, the maximum permissible transmission rate at the timing itself or a relative value of the maximum permissible transmission rate (for example, the binary value of the Up command / Down command) ).

  Thirdly, a radio resource control method called “Rate Control per Cell” has been studied.

  In this radio resource control method, the radio base station NodeB broadcasts the transmission rate of user data common to the mobile station UE in communication, or information necessary for calculating the transmission rate, and each mobile station Based on the received information, the transmission rate of user data is determined.

  Although there is a load of downlink control signal and a load of transmission rate control by the radio base station NodeB, user data transmission rate (or user data transmission) such as “Time & Rate Control” and “Rate Control per UE” Controlling the speed and transmission time individually can be a good control method for improving the channel capacity in the uplink.

  As shown in FIG. 14, “Rate Control per UE” controls the transmission rate of user data using an absolute rate control channel (AGCH) and a relative rate control channel (RGCH). By using many relative speed control channels (RGCH), it is possible to simplify the control signal to be transmitted in order to control the transmission rate of user data. This can reduce the impact.

For example, as described in Non-Patent Document 1, the detailed behavior of transmission rate control using a relative rate control channel (RGCH) including three values of Up / Down / Hold is described in the previous hybrid ARQ process. A method of instructing increase / decrease / hold from the transmission speed is common.

  Here, as shown in Non-Patent Document 1, the mobile station UE that has received the relative speed control channel (RGCH) from the non-serving cell uses the concept of hysteresis and window to the received relative speed control channel (RGCH). The included “Down instruction” is integrated retroactively for a predetermined period, and the integrated value is obtained as a transmission rate at that time (or a parameter relating to the transmission rate. )).

  As shown in Non-Patent Document 1, the mobile station UE provides hysteresis or a window in order to prevent a “ping-pong phenomenon” in which “Up instruction” transmission from the serving cell and “Down instruction” transmission from the non-serving cell are repeated. ing.

  The radio network controller RNC performs radio resource management in order to perform call admission control, handover control, and the like.

  Conventionally, the radio network controller RNC performs call admission control and handover control based on the amount of interference in the uplink. However, when uplink enhancement is applied, the amount of interference in the uplink is always acceptable. Since control is performed so as to approach the value, there is a problem in that call admission control and handover control cannot be performed simply based on whether there is a vacant amount of interference in the uplink.

In order to solve this problem, the radio network controller RNC measures the received power of the uplink enhancement channel (enhanced dedicated physical channel), and performs call admission control, handover control, etc. based on the measured received power. How to do is known.
3GPP TSG-RAN R1-050002

  However, in the conventional radio resource management method, the radio network controller RNC cannot accurately grasp the maximum allowable transmission rate reflecting the reduction range of the maximum allowable transmission rate broadcasted by the radio base station NodeB. There is a problem that high-performance radio resource management cannot be performed.

  Therefore, the present invention has been made in view of the above points, and by grasping the accurate wireless communication quality reflecting the reduction range of the maximum allowable transmission rate broadcasted by the wireless base station NodeB, a high-performance wireless communication is achieved. An object of the present invention is to provide a radio resource management method, a radio base station, and a radio network controller that can perform resource management.

  A first feature of the present invention is a radio resource management method for managing radio resources for transmitting user data via an uplink by a mobile station, wherein the radio base station Reporting the reduction range of the maximum allowable transmission rate of the user data being broadcast to the mobile station connected to the radio base station at a predetermined timing, and the radio network controller is reported And a step of managing the radio resource based on a reduction range of the maximum allowable transmission rate.

  In the first aspect of the present invention, the non-serving cell in the radio base station notifies the radio network controller of the mobile station connected to the non-serving cell at the predetermined timing. The reduction range of the maximum allowable transmission rate of user data may be reported, and the mobile station may increase the transmission rate of the user data to the maximum allowable transmission rate.

  A second feature of the present invention is a radio base station used in a mobile communication system in which the mobile station automatically increases the transmission rate of user data transmitted via the uplink up to the maximum allowable transmission rate. A maximum allowable transmission rate reduction width notifying unit configured to notify the mobile station connected to a non-serving cell in the radio base station of the reduction range of the maximum allowable transmission rate, and a radio line Maximum allowable transmission rate reduction configured to report to the control station, at a predetermined timing, the reduction range of the maximum allowable transmission rate reported to the mobile station connected to the non-serving cell. The gist is to have a width report section.

  A third feature of the present invention is a radio network controller used in a mobile communication system in which the mobile station automatically increases the transmission rate of user data transmitted via the uplink up to the maximum allowable transmission rate. And configured to acquire from the non-serving cell a reduction range of the maximum allowable transmission rate of user data in the uplink informing the mobile station connected to the non-serving cell in a specific radio base station. A maximum allowable transmission rate reduction width acquisition unit, and a radio resource management unit configured to manage radio resources for transmitting the user data based on the acquired reduction range of the maximum allowable transmission rate; It is a summary to comprise.

  A fourth feature of the present invention is a radio resource management method for managing radio resources for transmitting user data via an uplink by a mobile station, wherein the radio base station Transmitting a signal indicating reduction of the maximum allowable transmission rate of the user data being broadcast to the mobile station connected to the radio base station, and the radio network controller transmitting the maximum allowable And a step of managing the radio resources based on a reduction in transmission speed.

  In the fourth aspect of the present invention, the maximum allowable transmission of the user data reported by the non-serving cell in the radio base station to the mobile station connected to the non-serving cell to the radio network controller. The rate of speed reduction may be reported.

  In the fourth aspect of the present invention, the non-serving cell in the radio base station informs the mobile station connected to the non-serving cell to the radio network controller at a predetermined timing. The reduction width of the maximum allowable transmission rate of data may be reported.

  In the fourth aspect of the present invention, the non-serving cell in the radio base station informs the mobile station connected to the non-serving cell to the radio network controller at a predetermined timing. Even if the mobile station automatically increases the transmission rate of user data transmitted via the uplink to the maximum allowable transmission rate of the user data, reporting the reduction range of the maximum allowable transmission rate of data. Good.

  In the fourth aspect of the present invention, when the non-serving cell in the radio base station has a reduction in the maximum allowable transmission rate of the user data exceeding a predetermined level, the maximum of the user data is transmitted to the radio network controller. A signal indicating a reduction in the allowable transmission rate may be transmitted.

  In the fourth aspect of the present invention, when a non-serving cell in the radio base station has a transmission frequency of a “Down instruction” to a mobile station connected to the non-serving cell in the radio base station, the radio The signal may be transmitted to a line control station.

  A fifth feature of the present invention is a radio base station used in a mobile communication system in which a mobile station controls a transmission rate of user data based on a maximum allowable transmission rate of user data transmitted via an uplink. A maximum allowable transmission rate reduction notifying unit configured to notify the mobile station connected to a non-serving cell in the radio base station of the reduction of the maximum allowable transmission rate, and radio channel control A maximum allowable transmission rate reduction report unit configured to transmit a signal indicating a reduction in the maximum allowable transmission rate that is broadcast to a mobile station connected to the non-serving cell to a station; The gist is to provide.

  In the fifth aspect of the present invention, the mobile station may automatically increase the transmission rate of the user data up to a maximum allowable transmission rate of the user data.

  In the fifth aspect of the present invention, the maximum allowable transmission rate reduction reporting unit is informed to the radio network controller of the mobile station connected to a non-serving cell in the radio base station. It may be configured to report a reduction range of the maximum allowable transmission rate of the user data.

  In the fifth aspect of the present invention, the maximum allowable transmission rate reduction reporting unit is configured to transmit the mobile station connected to a non-serving cell in the radio base station to the radio network controller at a predetermined timing. It may be configured to report a reduction range of the maximum allowable transmission rate of the user data broadcasted.

  In the fifth aspect of the present invention, the maximum allowable transmission rate reduction report unit, when the reduction of the maximum allowable transmission rate of the user data exceeds a predetermined level, notifies the radio network controller of the user data. You may be comprised so that the signal which shows reduction of the maximum permissible transmission rate may be transmitted.

  In the fifth aspect of the present invention, the maximum allowable transmission rate reduction reporting unit, when a transmission frequency of a “Down instruction” for a mobile station connected to a non-serving cell in the radio base station exceeds a predetermined level, The signal may be transmitted to a radio network controller.

  According to a sixth aspect of the present invention, there is provided a radio channel control used in a mobile communication system in which a mobile station controls a transmission rate of user data based on a maximum allowable transmission rate of user data transmitted via an uplink. A signal indicating a reduction in the maximum allowable transmission rate of user data in the uplink, which is broadcast to the mobile station connected to the non-serving cell in a specific radio base station, is acquired from the non-serving cell A maximum allowable transmission rate reduction acquisition unit configured as described above, and a radio resource for transmitting the user data based on the acquired signal indicating the reduction of the maximum allowable transmission rate. The gist is to include a radio resource management unit.

  In the sixth aspect of the present invention, the mobile station may automatically increase the transmission rate of the user data up to a maximum allowable transmission rate of the user data.

  In the sixth aspect of the present invention, the maximum permissible transmission rate reduction acquisition unit is configured to provide maximum permissible user data in an uplink that is broadcast to the mobile station connected to a non-serving cell in a specific radio base station. You may be comprised so that the reduction width of a transmission rate may be acquired from this non-serving cell.

  In the sixth aspect of the present invention, the maximum permissible transmission rate reduction acquisition unit is configured to notify the mobile station connected to a non-serving cell in a specific radio base station at a predetermined timing in an uplink. The reduction width of the maximum allowable transmission rate of user data may be configured to be acquired from the non-serving cell.

  In the sixth aspect of the present invention, the maximum allowable transmission rate reduction acquisition unit is connected to a non-serving cell in a specific radio base station when the reduction of the maximum allowable transmission rate of the user data exceeds a predetermined level. The mobile station may be configured to acquire a reduction in the maximum allowable transmission rate of user data in the uplink broadcast to the mobile station from the non-serving cell.

  In the sixth aspect of the present invention, the maximum allowable transmission rate reduction acquisition unit, when the transmission frequency of the “Down instruction” for a mobile station connected to a non-serving cell in a specific radio base station exceeds a predetermined level, The mobile station connected to the non-serving cell in the radio base station may be configured to acquire from the non-serving cell a reduction in the maximum allowable transmission rate of user data in the uplink that is broadcast to the mobile station.

  In the fourth aspect of the present invention, the signal may be configured to be transmitted to the radio network controller at a predetermined time interval.

  In the fifth aspect of the present invention, the maximum allowable transmission rate reduction reporting unit transmits a signal indicating reduction of the maximum allowable transmission rate of the user data to the radio network controller at predetermined time intervals. It may be configured as follows.

  A seventh feature of the present invention is a radio resource management method for managing radio resources for transmitting user data via an uplink by a mobile station, wherein the radio base station Reporting the radio communication quality of a mobile station under a cell in the radio base station, and managing the radio resource based on the reported radio communication quality by the radio network controller. The gist.

  In the seventh aspect of the present invention, the radio communication quality is a reduction width of a maximum allowable transmission rate of user data in an uplink broadcast to the mobile station connected to a non-serving cell in the radio base station. May be reflected.

  In the seventh aspect of the present invention, the non-serving cell in the radio base station may report a reduction width of the maximum allowable transmission rate of the user data to the radio network controller at a predetermined timing.

  An eighth feature of the present invention is a radio base station used in a mobile communication system in which a mobile station controls a transmission rate of user data based on a maximum allowable transmission rate of user data transmitted via an uplink. A maximum allowable transmission rate configured to report a radio communication quality of a mobile station under the cell in the radio base station to the mobile station connected to a non-serving cell in the radio base station. The gist of the invention is that it includes a reduction notification unit and a maximum allowable transmission rate reduction report unit configured to report the radio communication quality to a radio network controller.

  In the eighth aspect of the present invention, the radio communication quality is a reduction width of a maximum allowable transmission rate of user data in an uplink broadcast to the mobile station connected to a non-serving cell in the radio base station. May be reflected.

  In the eighth aspect of the present invention, the maximum allowable transmission rate reduction reporting unit is configured to report a reduction range of the maximum allowable transmission rate of the user data to the radio network controller at a predetermined timing. May be.

  In the eighth aspect of the present invention, the mobile station may automatically increase the transmission rate of the user data up to a maximum allowable transmission rate of the user data.

  A ninth feature of the present invention is that radio channel control used in a mobile communication system in which a mobile station controls a transmission rate of user data based on a maximum allowable transmission rate of user data transmitted via an uplink. A maximum allowable transmission rate reduction acquisition unit configured to acquire the wireless communication quality of the mobile station under a non-serving cell in a specific wireless base station, and based on the acquired wireless communication quality, And a radio resource management unit configured to manage radio resources for transmitting the user data.

  In the ninth aspect of the present invention, the radio communication quality is a reduction width of a maximum allowable transmission rate of user data in an uplink broadcast to the mobile station connected to a non-serving cell in the radio base station. May be reflected.

  In the ninth aspect of the present invention, the mobile station may automatically increase the transmission rate of the user data up to a maximum allowable transmission rate of the user data.

  As described above, according to the present invention, accurate radio communication quality reflecting the reduction range of the maximum allowable transmission rate broadcasted by the radio base station NodeB is grasped, and high-performance radio resource management is performed. It is possible to provide a radio resource management method, a radio base station, and a radio network controller that can perform the above.

(Configuration of mobile communication system according to the first embodiment of the present invention)
The configuration of the mobile communication system according to the first embodiment of the present invention will be described with reference to FIGS. The mobile communication system according to the present embodiment includes a plurality of radio base stations NodeB # 1 to # 5 and a radio network controller RNC as shown in FIG.

  The mobile communication system according to this embodiment is configured to control the transmission rate of user data transmitted via the uplink by the mobile station UE.

  In the mobile communication system according to the present embodiment, “HSDPA” is used in the downlink, and “EUL (uplink enhancement)” is used in the uplink. In both “HSDPA” and “EUL”, retransmission control by HARQ (N process stop and wait) is performed.

  Accordingly, in the uplink, an enhanced dedicated physical data channel (E-DPDCH: Enhanced Dedicated Physical Channel) and an enhanced dedicated physical control channel (E-DPCCH: Enhanced Dedicated Physical Channel) DPCH: Enhanced Dedicated Physical Channel (DPCH): Dedicated Physical Data Channel (DPDCH: Dedicated Physical Data Channel) and Dedicated Physical Control Channel (DPCCH: Dedicated Physical Control Channel) DPCH: Dedicated Physical Channel) is used.

  Here, the enhanced dedicated physical control channel (E-DPCCH) is a transmission format number for defining the transmission format (transmission block size, etc.) of E-DPDCH, information on HARQ (number of retransmissions, etc.), information on scheduling, etc. EUL control data such as (transmission power and buffer retention amount in the mobile station UE) is transmitted.

  Further, the enhanced dedicated physical data channel (E-DPDCH) is mapped to the enhanced dedicated physical control channel (E-DPCCH), and the EUL control data transmitted by the enhanced dedicated physical control channel (E-DPCCH) Based on this, user data for the mobile station UE is transmitted.

  The dedicated physical control channel (DPCCH) is a pilot symbol used for RAKE combining or SIR measurement, a TFCI (Transport Format Combination Indicator) for identifying the transmission format of the uplink dedicated physical data channel (DPDCH), and the downlink Control data such as a transmission power control bit is transmitted.

  The dedicated physical data channel (DPDCH) is mapped to the dedicated physical control channel (DPCCH), and user data for the mobile station UE is transferred based on the control data transmitted on the dedicated physical control channel (DPCCH). Send. However, when there is no user data to be transmitted in the mobile station UE, the dedicated physical data channel (DPDCH) may be configured not to be transmitted.

  In the uplink, a high-speed dedicated physical control channel (HS-DPCCH) required when HSPDA is applied and a random access channel (RACH) are also used.

  The high-speed dedicated physical control channel (HS-DPCCH) transmits a downlink quality identifier (CQI: Channel Quality Indicator) and a high-speed dedicated physical data channel acknowledgment signal (Ack or Nack).

  As shown in FIG. 1, the mobile station UE according to the present embodiment includes a bus interface 31, a call processing unit 32, a baseband processing unit 33, an RF unit 34, and a transmission / reception antenna 35.

  However, such functions may exist independently as hardware, may be partly or wholly integrated, or may be configured by a software process.

  The bus interface 31 is configured to transfer user data output from the call processing unit 32 to another functional unit (for example, a functional unit related to an application). The bus interface 31 is configured to transfer user data transmitted from another function unit (for example, a function unit related to an application) to the call processing unit 32.

  The call processing unit 32 is configured to perform call control processing for transmitting and receiving user data.

  The baseband signal processing unit 33 performs layer 1 processing including despreading processing, RAKE combining processing, and FEC decoding processing, MAC-e processing, and MAC-d processing on the baseband signal transmitted from the RF unit 34. It is configured to transmit the user data acquired by performing the MAC processing including the RLC processing to the call processing unit 32.

  Further, the baseband signal processing unit 33 performs RLC processing, MAC processing, and layer 1 processing on the user data transmitted from the call processing unit 32 to generate a baseband signal and transmit it to the RF unit 34. It is configured.

  A specific function of the baseband signal processing unit 33 will be described later. The RF unit 34 generates a baseband signal by performing detection processing, filtering processing, quantization processing, and the like on the signal in the radio frequency band received via the transmission / reception antenna 35, and sends the baseband signal to the baseband signal processing unit 33. Configured to send. The RF unit 34 is configured to convert the baseband signal transmitted from the baseband signal processing unit 33 into a signal in a radio frequency band.

  As shown in FIG. 2, the baseband signal processing unit 33 includes an RLC processing unit 33a, a MAC-d processing unit 33b, a MAC-e processing unit 33c, and a layer 1 processing unit 33d.

  The RLC processing unit 33a is configured to perform processing (RLC processing) in the upper layer of layer 2 on the user data transmitted from the call processing unit 32 and transmit the processed data to the MAC-d processing unit 33b. .

  The MAC-d processing unit 33b is configured to add a channel identifier header and create an uplink transmission format based on the limit of uplink transmission power.

  As shown in FIG. 3A, the MAC-e processing unit 33c includes an E-TFC selection unit 33c1 and a HARQ processing unit 33c2.

  Based on the scheduling signal transmitted from the radio base station NodeB, the E-TFC selection unit 33c1 transmits the transmission format (E-TFC) of the enhanced dedicated physical data channel (E-DPDCH) and the enhanced dedicated physical control channel (E-DPCCH). ) Is configured to determine.

  The E-TFC selection unit 33c1 also transmits transmission format information (transmission data block size, transmission power ratio between the enhanced dedicated physical data channel (E-DPDCH) and the dedicated physical control channel (DPCCH), etc.) for the determined transmission format. ) Is transmitted to the layer 1 processing unit 33d, and the determined transmission data block size or transmission power ratio is transmitted to the HARQ processing unit 33c2.

  Here, the scheduling signal is the maximum allowable transmission rate of user data in the mobile station UE (for example, the maximum allowable transmission data block size, the enhanced dedicated physical data channel (E-DPDCH) and the dedicated physical control channel (DPCCH)). A maximum value of transmission power ratio (maximum allowable transmission power ratio, etc.), or a parameter relating to the maximum allowable transmission rate. In this specification, unless otherwise specified, the maximum allowable transmission rate includes a parameter relating to the maximum allowable transmission rate.

  The scheduling signal is information broadcast in the cell where the mobile station UE is located, and all mobile stations located in the cell or a specific group located in the cell Control information for mobile stations.

  Here, the E-TFC selection unit 33c1 is configured to increase the transmission rate of user data in the uplink until reaching the maximum allowable transmission rate notified by the schedule signal from the radio base station NodeB. .

  The E-TFC selection unit 33c1 is notified of the time width T1 associated with the relative speed control channel (RGCH) from the non-serving cell when the connection is set up from the radio network controller RNC.

  The mobile station UE is configured to receive a relative rate control channel (RGCH) from a non-serving cell when connected to a cell (non-serving cell) other than the serving cell set. Here, a case where the relative speed control channel (RGCH) is configured by two values of “Down / Don't care”, a case where it is configured by a percentage, or the like can be considered.

  The E-TFC selection unit 33c1 stores the received relative speed control channel (RGCH) in a sliding window having a time width T1. Here, the sliding window is configured to slide sequentially (see FIG. 3B).

  As shown in FIG. 3B, the E-TFC selection unit 33c1 receives one of “Down / Don't care” at each transmission time interval (TTI) and uses a sliding window. The relative value (reduction width) of the maximum allowable transmission rate included in the relative rate control channel (RGCH) from the non-serving cell is determined.

  For example, in the example of FIG. 3B, when the reduction width indicated by one “Down instruction” is “1 dB”, in both cases of t = a [TTI] or t = a + 1 [TTI]. This means that the relative value (reduction width) of the maximum allowable transmission rate is “2 dB”.

  When the reduction range indicated by one “Down instruction” is “20%”, the relative value of the maximum allowable transmission rate in both cases of t = a [TTI] or t = a + 1 [TTI]. (Reduction width) means “40%”.

  In both TTIs, the “Down instruction” is present in the sliding window, so the E-TFC selection unit 33c1 controls the transmission rate of the uplink user data without considering the “Up instruction” from the serving cell set. .

  Even if the “Down instruction” is received from the serving cell set, the “Down instruction” from the serving cell set is invalid because the “Down instruction” exists in the sliding window.

  The HARQ processing unit 33c2 performs process management of “stop and wait for N processes”, and based on the delivery confirmation signal (Ack / Nack for uplink data) received from the radio base station NodeB, the user data in the uplink It is configured to transmit.

  Specifically, the HARQ processing unit 33c2 determines whether or not the downlink user data reception process is successful based on the CRC result input from the layer 1 processing unit 33d. Then, the HARQ processing unit 33c2 generates a delivery confirmation signal (Ack or Nack for downlink user data) based on the determination result and transmits it to the layer 1 processing unit 33d. Further, when the above determination result is OK, the HARQ processing unit 33c2 transmits the downlink user data input from the layer 1 processing unit 33d to the MAC-d processing unit 33d.

  As shown in FIG. 4, the radio base station NodeB according to the present embodiment includes an HWY interface 11, a baseband signal processing unit 12, a call control unit 13, one or a plurality of transmission / reception units 14, and one or A plurality of amplifier units 15 and one or a plurality of transmission / reception antennas 16 are provided.

  The HWY interface 11 is an interface with the radio network controller RNC. Specifically, the HWY interface 11 is configured to receive user data to be transmitted from the radio network controller RNC to the mobile station UE via the downlink and to input the user data to the baseband signal processing unit 12. . The HWY interface 11 is configured to receive control data for the radio base station NodeB from the radio network controller RNC and input it to the call controller 13.

  The HWY interface 11 is configured to acquire user data included in an uplink signal received from the mobile station UE via the uplink from the baseband signal processing unit 12 and transmit the user data to the radio network controller RNC. Has been. Further, the HWY interface 11 is configured to acquire control data for the radio network controller RNC from the call controller 13 and transmit it to the radio network controller RNC.

  The baseband signal processing unit 12 performs RLC processing, MAC processing (MAC-d processing or MAC-e processing) and layer 1 processing on user data acquired from the HWY interface 11 to generate a baseband signal. The data is transmitted to the transmission / reception unit 14.

  Here, downlink MAC processing includes HARQ processing, scheduling processing, transmission rate control processing, and the like. Further, the layer 1 processing in the downlink includes channel coding processing and spreading processing of user data.

  The baseband signal processing unit 12 extracts user data by performing layer 1 processing, MAC processing (MAC-e processing or MAC-d processing), and RLC processing on the baseband signal acquired from the transmission / reception unit 14. Then, it is configured to transfer to the HWY interface 11.

  Here, the MAC processing in the uplink includes HARQ processing, scheduling processing, transmission rate control processing, header discard processing, and the like. Further, the layer 1 processing in the uplink includes despreading processing, RAKE combining processing, error correction decoding processing, and the like.

  A specific function of the baseband signal processing unit 12 will be described later. The call control unit 13 performs call control processing based on control data acquired from the HWY interface 11.

  For example, the call control unit 13 responds to the reduction width report request transmitted from the radio network controller RNC, and finally notifies the maximum allowable transmission rate (maximum allowable transmission rate) notified to the mobile station UE connected to the subordinate cell. A reduction width (a reduction width indicated by the “Down instruction”) of the transmission data block size and the maximum allowable transmission power ratio) is reported.

  The call control unit 13 may be configured to report a reduction range of the maximum allowable transmission rate in response to a predetermined trigger, or configured to report the reduction range of the maximum allowable transmission rate at a predetermined period. It may be.

  For example, when the transmission frequency of the “Down instruction” to the mobile station UE (non-serving mobile station UE) connected to the non-serving cell in the radio base station Node B exceeds the predetermined level, the call control unit 13 The RNC may be configured to report a “load excess indicator”.

  Here, the “overload instruction” notifies the reduction of the allowable transmission rate of user data in the uplink.

  The transmission / reception unit 14 is configured to perform a process of converting the baseband signal acquired from the baseband signal processing unit 12 into a radio frequency band signal (downlink signal) and transmit the signal to the amplifier unit 15. In addition, the transmission / reception unit 14 is configured to perform a process of converting a radio frequency band signal (uplink signal) acquired from the amplifier unit 15 into a baseband signal and transmit the signal to the baseband signal processing unit 12.

  The amplifier unit 15 is configured to amplify the downlink signal acquired from the transmission / reception unit 14 and transmit it to the mobile station UE via the transmission / reception antenna 16. The amplifier unit 15 is configured to amplify the uplink signal received by the transmission / reception antenna 16 and transmit the amplified uplink signal to the transmission / reception unit 14.

  As shown in FIG. 5, the baseband signal processing unit 12 includes an RLC processing unit 121, a MAC-d processing unit 122, and a MAC-e and layer 1 processing unit 123.

  The MAC-e and layer 1 processing unit 123 is configured to perform despreading processing, RAKE combining processing, error correction decoding processing, HARQ processing, and the like on the baseband signal acquired from the transmission / reception unit 14.

  The MAC-d processing unit 122 is configured to perform header discard processing and the like on the output signals from the MAC-e and layer 1 processing unit 123.

  The RLC processing unit 121 is configured to perform retransmission control processing in the RLC layer, RLC-SDU reconstruction processing, and the like on the output signal from the MAC-d processing unit 122.

  However, these functions are not clearly divided by hardware, and may be realized by software.

  As shown in FIG. 6, the MAC-e and layer 1 processing unit (uplink configuration) 123 includes a DPCCH RAKE unit 123a, a DPDCH RAKE unit 123b, an E-DPCCH RAKE unit 123c, and an E-DPDCH RAKE unit 123d. HS-DPCCH RAKE unit 123e, RACH processing unit 123f, TFCI decoder unit 123g, buffers 123h and 123m, re-despreading units 123i and 123n, FEC decoder units 123j and 123p, and E-DPCCH decoder unit 123k, a MAC-e function unit 123l, a HARQ buffer 123o, a MAC-hs function unit 123q, and an interference power measurement unit 123r.

  The E-DPCCH RAKE unit 123c is included in the despreading process and the dedicated physical control channel (DPCCH) for the enhanced dedicated physical control channel (E-DPCCH) in the baseband signal transmitted from the transmitting / receiving unit 14. RAKE combining processing using existing pilot symbols is performed.

  The E-DPCCH decoder unit 123k performs a decoding process on the RAKE composite output of the E-DPCCH RAKE unit 123c, acquires a transmission format number, information on HARQ, information on scheduling, and the like to the MAC-e function unit 123l. Configured to input.

  The E-DPDCH RAKE unit 123d transmits the transmission format information (number of codes) transmitted from the MAC-e function unit 123l to the enhanced dedicated physical data channel (E-DPDCH) in the baseband signal transmitted from the transmission / reception unit 14. ) And RAKE combining processing using pilot symbols included in the dedicated physical control channel (DPCCH).

  The buffer 123m is configured to accumulate the RAKE combined output of the E-DPDCH RAKE unit 123d based on the transmission format information (number of symbols) transmitted from the MAC-e function unit 123l.

  Based on the transmission format information (spreading rate) transmitted from the MAC-e function unit 123l, the re-despreading unit 123n performs inverse processing on the RAKE combined output of the E-DPDCH RAKE unit 123d stored in the buffer 123m. It is configured to perform a diffusion process.

  The HARQ buffer 123o is configured to accumulate the despread processing output of the re-despreading unit 123n based on the transmission format information transmitted from the MAC-e function unit 123l.

  Based on the transmission format information (transmission data block size) transmitted from the MAC-e function unit 123l, the FEC decoder unit 123p outputs the despreading processing output of the re-despreading unit 123n accumulated in the HARQ buffer 123o. In addition, an error correction decoding process (FEC decoding process) is performed.

  The interference power measurement unit 123r is configured to measure the amount of interference (noise rise) in the uplink, for example, interference power by a mobile station having the own cell as a serving cell, overall interference power, and the like.

  Here, the noise rise is the ratio of the interference power in a predetermined channel within a predetermined frequency and the noise power within the predetermined frequency (thermal noise power or noise power from outside the mobile communication system) (the level of a received signal from the noise floor). ). That is, the noise rise is an offset that the reception level in the communication state has with respect to the reception level (noise floor) in the communication state.

  The MAC-e function unit 123l transmits the transmission format information (number of codes, number of symbols, spreading factor, transmission data block size, etc. based on the transmission format number, HARQ information, scheduling information, etc. acquired from the E-DPCCH decoder unit 123k. Etc.) is calculated and output.

  Further, as shown in FIG. 7, the MAC-e functional unit 123l includes a reception processing command unit 123l1, a HARQ management unit 123l2, and a scheduling unit 123l3.

  The reception processing command unit 123l1 is configured to transmit the transmission format number, the information related to HARQ, and the information related to scheduling input from the E-DPCCH decoder unit 123k to the HARQ management unit 123l2.

  Further, the reception processing command unit 123l1 is configured to transmit information related to scheduling input from the E-DPCCH decoder unit 123k to the scheduling unit 123l3.

  Further, the reception processing command unit 12311 is configured to output transmission format information corresponding to the transmission format number input from the E-DPCCH decoder unit 123k.

  The HARQ management unit 123l2 determines whether or not the reception process of the uplink user data is successful based on the CRC result input from the FEC decoder unit 123p. Then, the HARQ management unit 12312 generates a delivery confirmation signal (Ack or Nack) based on the determination result, and transmits it to the downlink configuration of the baseband signal processing unit 12. Further, when the above determination result is OK, the HARQ management unit 123l2 transmits the uplink user data input from the FEC decoder unit 123p to the radio network controller RNC.

  Further, the HARQ management unit 12312 clears the soft decision information stored in the HARQ buffer 123o when the above-described determination result is OK. On the other hand, when the above determination result is NG, the HARQ management unit 123l2 accumulates uplink user data in the HARQ buffer 123o.

  Also, the HARQ management unit 123l2 transfers the above-described determination result to the reception processing command unit 123l1, and the reception processing command unit 123l1 assigns hardware resources to be prepared for the next TTI based on the received determination result to the E-DPDCH. Notification is made to the RAKE unit 123d and the buffer 123m, and notification for securing resources in the HARQ buffer 123o is performed.

  In addition, when there is uplink user data stored in the buffer 123m for each TTI with respect to the buffer 123m and the FEC decoder unit 123p, the reception processing command unit 123l1 stores the TTI stored in the HARQ buffer 123o. The HARQ buffer 123o and the FEC decoder unit 123p are instructed to perform the FEC decoding process after adding the uplink user data and the newly received uplink user data in the process corresponding to.

  In addition, the scheduling unit 123l3 can determine the maximum allowable transmission rate (maximum allowable transmission data block size or maximum allowable transmission power ratio based on uplink radio resources of the radio base station NodeB, interference amount (noise rise) in the uplink, and the like. Etc.) is instructed to the downlink configuration of the baseband signal processing unit 12 so as to notify the scheduling signal.

  Specifically, the scheduling unit 123l3 is based on scheduling-related information (radio resources in the uplink) transmitted from the E-DPCCH decoder unit 123k and the uplink interference amount transmitted from the interference power measurement unit 123r. The maximum allowable transmission rate is determined, and the transmission rate of user data in the mobile station (serving mobile station) in communication is controlled.

  In addition, the scheduling unit 123l3, based on the amount of interference in the uplink from the interference power measurement unit 123r, reduces the maximum allowable transmission rate described above (that is, the maximum allowable transmission rate transmitted by the relative rate control channel (RGCH)). Relative value) is determined, and the transmission rate of user data in the mobile stations (serving mobile station and non-serving mobile station) in communication is controlled.

  The radio network controller RNC according to the present embodiment is an apparatus positioned above the radio base station NodeB, and is configured to control radio communication between the radio base station NodeB and the mobile station UE.

  As shown in FIG. 8, the radio network controller RNC according to the present embodiment includes an exchange interface 51, an LLC layer processing unit 52, a MAC layer processing unit 53, a media signal processing unit 54, and a base station interface 55. And a call control unit 56.

  The switching center interface 51 is an interface with the switching center 1. The switching center interface 51 is configured to transfer the downlink signal transmitted from the switching center 1 to the LLC layer processing unit 52 and to transfer the uplink signal transmitted from the LLC layer processing unit 52 to the switching center 1. Yes.

  The LLC layer processing unit 52 is configured to perform an LLC (Logical Link Control) sublayer process such as a header of a sequence number or a trailer combining process. The LLC layer processing unit 52 is configured to transmit the uplink signal to the switching center interface 51 and transmit the downlink signal to the MAC layer processing unit 53 after performing the LLC sublayer processing.

  The MAC layer processing unit 53 is configured to perform MAC layer processing such as priority control processing and header addition processing. After performing the MAC layer processing, the MAC layer processing unit 53 transmits an uplink signal to the LLC layer processing unit 52 and transmits a downlink signal to the base station interface 55 (or the media signal processing unit 54). It is configured as follows.

  The media signal processing unit 54 is configured to perform media signal processing on audio signals and real-time image signals. The media signal processing unit 54 is configured to transmit the uplink signal to the MAC layer processing unit 53 and transmit the downlink signal to the base station interface 55 after performing the media signal processing.

  The base station interface 55 is an interface with the radio base station NodeB. The base station interface 55 transfers the uplink signal transmitted from the radio base station NodeB to the MAC layer processing unit 53 (or media signal processing unit 54), and the MAC layer processing unit 53 (or media signal processing unit 54). The downlink signal transmitted from is transmitted to the radio base station NodeB.

  The call control unit 56 is configured to perform radio resource management processing for managing radio resources such as call admission control processing and handover processing, channel setting and release processing by layer 3 signaling, and the like.

  Specifically, the call control unit 56 sets the reduction range of the maximum allowable transmission rate of user data in the uplink that is informing the mobile station connected to the specific radio base station to the specific radio base station. It is configured to obtain from the station.

  Further, the call control unit 56 is configured to manage radio resources for transmitting uplink user data based on the acquired reduction width of the maximum allowable transmission rate.

  Note that the call control unit 56 is configured to acquire the reduction range of the maximum allowable transmission rate by requesting the radio base station NodeB to report the reduction range of the maximum allowable transmission rate. It may be.

(Operation of the mobile communication system according to the first embodiment of the present invention)
With reference to FIG.9 and FIG.10, operation | movement of the mobile communication system which concerns on the 1st Embodiment of this invention is demonstrated.

  First, with reference to FIG. 9, the operation of the call admission control process in the mobile communication system according to the first embodiment of the present invention will be described. Here, it is assumed that the “Autonomous ramping method” is applied in the mobile communication system according to the present embodiment.

  As shown in FIG. 9, in step S1001, the mobile station UE located in a specific cell sends a communication start request (new enhanced dedicated physical channel (E-DPCH) setting request) to the radio network controller RNC. Send.

  In step S1002, the radio network controller RNC ends with a relative speed control channel (RGCH) for a non-serving cell of the mobile station UE with respect to a mobile station (non-serving mobile station) UE located in the specific cell. A reduction width report request for requesting to report the reduction width of the maximum allowable transmission rate of the uplink user data notified to (a reduction width indicated by the “Down instruction”) is transmitted. In step S1003, in response to the received reduction report request, the non-serving cell transmits a relative speed control channel to the radio network controller RNC to a mobile station (non-serving mobile station) located in the specific cell. A reduction width report response for reporting the reduction width of the maximum allowable transmission rate of the uplink user data last broadcasted by (RGCH) is transmitted.

  At this time, whether or not the radio network controller RNC accepts a communication start request based on the reported reduction of the maximum allowable transmission rate (whether or not to set a new enhanced dedicated physical channel (E-DPCH)) Judge about. For example, the radio network controller RNC determines that a new enhanced dedicated physical channel (E-DPCH) is not set when the maximum allowable transmission rate reflecting the received reduction width is below a predetermined threshold.

  When the radio network controller RNC determines to accept the communication start request, in step S1004, the radio network controller RNC transmits a connection setting request to the serving cell and the non-serving cell of the mobile station UE, and in step S1005, The serving cell and the non-serving cell of the mobile station UE transmit a connection setup response to the radio network controller RNC.

  Note that the radio network controller RNC may be configured to simultaneously transmit the reduction width report request and the connection setting request.

  In steps S1006 and S1007, a control channel is set between the mobile station UE and the radio network controller RNC.

  In step S1008, a user data channel via the core network CN is set between the mobile station UE and the communication partner, and in step S1009, communication using the user data channel is started.

  Thereafter, the non-serving cell notifies the radio network controller RNC of the reduction width of the maximum allowable transmission rate at a predetermined timing (see step S1010).

  2ndly, with reference to FIG. 10, the operation | movement which the mobile station UE performs the handover process from serving cell # 1 to serving cell # 2 in the mobile communication system which concerns on the 1st Embodiment of this invention is demonstrated.

  As shown in FIG. 10, in step S2001, the mobile station UE is connected to the serving cell # 1 and the non-serving cell, and performs communication using the user data channel.

  When the radio network controller RNC determines that it is necessary to perform the above handover process, in step S2002, the radio network controller RNC makes a relative to a mobile station (non-serving mobile station) located in the specific cell with respect to the non-serving cell. A reduction width report request for requesting to report the reduction width of the maximum allowable transmission rate of uplink user data broadcasted last on the rate control channel (RGCH) is transmitted.

  In step S2003, the non-serving cell sends a relative speed control channel (RGCH) to the mobile station (non-serving mobile station) located in the specific cell to the radio network controller RNC in response to the received reduction report request. ) Transmits a reduction width report response for reporting the reduction width of the maximum allowable transmission rate of the uplink user data last broadcast.

  At this time, whether or not the radio network controller RNC can perform the above-described handover process based on the reported reduction of the maximum allowable transmission rate (new between the serving cell # 2 and the mobile station UE). Whether or not a connection can be set. For example, the radio network controller RNC determines that the handover process to the serving cell # 2 should not be performed when the maximum allowable transmission rate reflecting the reported reduction width is below a predetermined threshold.

  When it is determined that the radio network controller RNC can perform the above-described handover process, in step S2004, the radio network controller RNC prepares to change the cell to which the mobile station UE is connected. In step S2005, the serving cell # 1 makes a preparation corresponding to the connection change preparation request, and sends a connection change preparation response notifying that the preparation has been completed. Transmit to the radio network controller RNC.

  In step S2006, the radio network controller RNC transmits a connection change preparation request instructing to prepare for changing the cell to which the mobile station UE is connected to the serving cell # 2, and in step S2007, the serving cell # 2 Prepares for the connection change preparation request, and transmits a connection change preparation response notifying that the preparation is completed to the radio network controller RNC.

  In step S2008, the radio network controller RNC transmits a connection release request for releasing the connection between the mobile station UE and the serving cell # 1 to the serving cell # 1, and in steps S2009 and S2010, the serving cell # 1 serves as a serving cell. A connection setting request for setting a connection between the mobile station UE and the serving cell # 2 is transmitted to # 2 and the mobile station UE, respectively.

  In step S2011, communication using the user data channel set between the mobile station UE and the serving cell # 2 is started.

(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 radio network controller RNC can accurately grasp the radio communication quality of the mobile stations under each cell, and perform high-performance radio resource management. It can be carried out.

  According to the mobile communication system according to the first embodiment of the present invention, the radio network controller RNC transmits a reduction report request by transmitting a reduction width report request at a necessary timing (mobile station ( It is possible to accurately grasp the reduction range of the maximum allowable transmission rate of the uplink user data last notified to the non-serving mobile station) by the relative rate control channel (RGCH), and to perform high-performance radio resource management.

It is a functional block diagram of the mobile station of the mobile communication system which concerns on one Embodiment of this invention. It is a functional block diagram of the baseband signal processing part in the mobile station of the mobile communication system which concerns on one Embodiment of this invention. It is a functional block diagram of the MAC-e processing unit of the baseband signal processing unit in the mobile station of the mobile communication system according to one embodiment of the present invention. It is a functional block diagram of the radio base station of the mobile communication system which concerns on one Embodiment of this invention. FIG. 3 is a functional block diagram of a baseband signal processing unit in a radio base station of a mobile communication system according to an embodiment of the present invention. FIG. 4 is a functional block diagram of a MAC-e and a layer 1 processing unit (uplink configuration) in a baseband signal processing unit of a radio base station of a mobile communication system according to an embodiment of the present invention. It is a functional block diagram of MAC-e function part of MAC-e in a baseband signal processing part of the radio base station of the mobile communication system which concerns on one Embodiment of this invention, and a layer 1 process part (configuration for uplink). It is a functional block diagram of the radio network controller of the mobile communication system according to an embodiment of the present invention. It is a sequence diagram which shows operation | movement of the mobile communication system which concerns on one Embodiment of this invention. It is a sequence diagram which shows operation | movement of the mobile communication system which concerns on one Embodiment of this invention. 1 is an overall configuration diagram of a general mobile communication system. It is a figure for demonstrating the operation | movement at the time of transmitting bursty data in the conventional mobile communication system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Switching office, NodeB ... Wireless base station, 11 ... HWY interface, 12, 33 ... Baseband signal processing part, 121, 33a ... RLC processing part, 122, 33b ... MAC-d processing part, 123 ... MAC-e and Layer 1 processing unit, 123a ... DPCCH RAKE unit, 123b ... DPDCH RAKE unit, 123c ... E-DPCCH RAKE unit, 123d ... E-DPDCH RAKE unit, 123e ... HS-DPCCH RAKE unit, 123f ... RACH processing unit, 123g ... TFCI Decoder unit, 123h, 123m, buffer, 123i, 123n, re-spreading unit, 123j, 123p, FEC decoder unit, 123k, E-DPCCH decoder unit, 123l, MAC-e function unit, 123l1, reception processing command unit, 123l2 ... HARQ management unit, 123l3 ... Juring unit, 123o ... HAQR buffer, 123q ... MAC-hs function unit, 123r ... interference power measurement unit, 13, 56 ... call control unit, 14 ... transmission / reception unit, 15 ... amplifier unit, 16, 35 ... transmission / reception antenna, UE ... mobile station, 31 ... bus interface, 32 ... call processing unit, 34 ... RF unit, 33c ... MAC-e processing unit, 33c1 ... E-TFCI selection unit, 33c2 ... HARQ processing unit, 33d ... layer 1 processing unit, RNC ... Wireless network control station, 51 ... Switch office interface, 52 ... LLC layer processing section, 53 ... MAC layer processing section, 54 ... Media signal processing section, 55 ... Base station interface

Claims (21)

A mobile communication method in which a mobile station controls a transmission rate of user data based on a maximum allowable transmission rate of user data transmitted via an uplink,
A step in which the radio base station transmits a signal indicating a reduction in the maximum allowable transmission rate of the user data being broadcast to the mobile station connected to the radio base station to the radio network controller. A mobile communication method comprising:   The non-serving cell in the radio base station reports to the radio network controller the reduction width of the maximum allowable transmission rate of the user data being broadcast to the mobile station connected to the non-serving cell. The mobile communication method according to claim 1, wherein:   Reduction width of the maximum allowable transmission rate of the user data that the non-serving cell in the radio base station is informing the mobile station connected to the non-serving cell to the radio network controller at a predetermined timing. The mobile communication method according to claim 1, wherein: Reduction width of the maximum allowable transmission rate of the user data that the non-serving cell in the radio base station is informing the mobile station connected to the non-serving cell to the radio network controller at a predetermined timing. Report
The mobile communication method according to claim 1, wherein the mobile station automatically increases a transmission rate of user data transmitted via an uplink up to a maximum allowable transmission rate of the user data.   If the non-serving cell in the radio base station has a reduction in the maximum allowable transmission rate of the user data exceeding a predetermined level, a signal indicating a reduction in the maximum allowable transmission rate of the user data is sent to the radio network controller. The mobile communication method according to claim 1, wherein transmission is performed.   When a non-serving cell in the radio base station has a transmission frequency of a “Down instruction” to a mobile station connected to the non-serving cell in the radio base station exceeds a predetermined level, the signal is sent to the radio network controller. The mobile communication method according to claim 1, wherein: A mobile station is a radio base station used in a mobile communication system that controls a transmission rate of user data based on a maximum allowable transmission rate of user data transmitted via an uplink,
A maximum allowable transmission rate reduction notification unit configured to notify the mobile station connected to a non-serving cell in the radio base station of the reduction of the maximum allowable transmission rate;
Maximum allowable transmission rate reduction report configured to transmit a signal indicating reduction of the maximum allowable transmission rate informed to a mobile station connected to the non-serving cell to a radio network controller. A radio base station.   The radio base station according to claim 7, wherein the mobile station automatically increases the transmission rate of the user data up to a maximum allowable transmission rate of the user data.   The maximum allowable transmission rate reduction reporting unit is configured to notify the radio network controller of the maximum allowable transmission rate of the user data broadcasted to the mobile station connected to a non-serving cell in the radio base station. The radio base station according to claim 7, wherein the radio base station is configured to report a reduction range.   The maximum allowable transmission rate reduction report unit reports the user data broadcast to the mobile station connected to a non-serving cell in the radio base station to the radio network controller at a predetermined timing. The radio base station according to claim 7, wherein the radio base station is configured to report a reduction range of a maximum allowable transmission rate.   The maximum allowable transmission rate reduction report unit indicates a signal indicating reduction of the maximum allowable transmission rate of the user data to the radio network controller when the reduction of the maximum allowable transmission rate of the user data exceeds a predetermined level. The radio base station according to claim 7, wherein the radio base station is configured to transmit a radio wave.   The maximum allowable transmission rate reduction reporting unit, when the transmission frequency of “Down instruction” for a mobile station connected to a non-serving cell in the radio base station exceeds a predetermined level, to the radio network controller The radio base station according to claim 7, wherein the radio base station is configured to transmit a signal. A mobile station is a radio network controller used in a mobile communication system for controlling a transmission rate of user data based on a maximum allowable transmission rate of user data transmitted via an uplink,
It is configured to acquire a signal indicating a reduction in the maximum allowable transmission rate of user data in the uplink that is broadcast to the mobile station connected to a non-serving cell in a specific radio base station from the non-serving cell A maximum allowable transmission rate reduction acquisition unit,
And a radio resource management unit configured to manage radio resources for transmitting the user data based on the acquired signal indicating reduction in the maximum allowable transmission rate. Control station.   The radio network controller according to claim 13, wherein the mobile station automatically increases the transmission rate of the user data up to a maximum allowable transmission rate of the user data.   The maximum allowable transmission rate reduction acquisition unit is configured to obtain a reduction range of the maximum allowable transmission rate of user data in the uplink that is informing the mobile station connected to the non-serving cell in a specific radio base station, to the non-serving cell The radio network controller according to claim 13, wherein the radio network controller is configured to acquire from the radio network controller.   The maximum permissible transmission rate reduction acquisition unit reduces the maximum permissible transmission rate of user data in the uplink that is informing the mobile station connected to a non-serving cell in a specific radio base station at a predetermined timing. The radio network controller according to claim 13, wherein the width is acquired from the non-serving cell. The maximum allowable transmission rate reduction acquisition unit notifies the mobile station connected to a non-serving cell in a specific radio base station when the reduction of the maximum allowable transmission rate of the user data exceeds a predetermined level. The radio network controller according to claim 13, wherein the radio network controller is configured to acquire a signal indicating a reduction in a maximum allowable transmission rate of user data in an existing uplink from the non-serving cell. The maximum allowable transmission rate reduction acquisition unit is connected to a non-serving cell in a radio base station when the transmission frequency of a “Down instruction” for a mobile station connected to the non-serving cell in a specific radio base station exceeds a predetermined level. 14. The apparatus according to claim 13, wherein a signal indicating a reduction in a maximum allowable transmission rate of user data in an uplink that is broadcast to the mobile station that is being broadcasted is acquired from the non-serving cell. The described radio network controller.   The mobile communication method according to claim 1, wherein the signal is configured to be transmitted to the radio network controller at a predetermined time interval.   The maximum allowable transmission rate reduction reporting unit is configured to transmit a signal indicating a reduction in the maximum allowable transmission rate of the user data to the radio network controller at predetermined time intervals. The radio base station according to claim 7. The mobile communication method according to claim 1, further comprising the step of managing the radio resource based on the transmitted signal indicating the reduction of the maximum allowable transmission rate.

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