JP4636981B2 - Transmission power control method and mobile communication system - Google Patents

Transmission power control method and mobile communication system Download PDF

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JP4636981B2
JP4636981B2 JP2005272698A JP2005272698A JP4636981B2 JP 4636981 B2 JP4636981 B2 JP 4636981B2 JP 2005272698 A JP2005272698 A JP 2005272698A JP 2005272698 A JP2005272698 A JP 2005272698A JP 4636981 B2 JP4636981 B2 JP 4636981B2
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mobile station
unit
channel
transmission power
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JP2007060596A (en
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アニール ウメシュ
昌史 臼田
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株式会社エヌ・ティ・ティ・ドコモ
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Description

  The present invention relates to a transmission power control method and a mobile communication system.

  In the conventional mobile communication system, when the radio network controller RNC sets a dedicated physical channel (DPCH) between the mobile station UE and the radio base station NodeB, the radio base station NodeB is configured to receive the radio base station NodeB. Hardware resources (hereinafter referred to as hardware resources), uplink radio resources (uplink interference amount), transmission power of the mobile station UE, transmission processing performance of the mobile station UE, and transmission rate required by a higher-level application In view of the above, it is configured to determine the transmission rate of the uplink user data and notify the mobile station UE and the radio base station NodeB as a layer 3 (Radio Resource Control layer) message. .

  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.

  On the other hand, in data communication, traffic often occurs in bursts as compared to voice calls and TV calls, and it is originally desirable that the transmission rate of uplink user data can be changed at high speed.

  However, as shown in FIG. 14, in the conventional mobile communication system, the radio network controller RNC usually controls and controls many radio base stations Node B, and the processing load and processing in the radio network controller RNC are controlled. Since the delay is assumed to increase, there is a problem that it is difficult to perform high-speed (for example, about 1 to 100 ms) uplink user data transmission rate change control.

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

  Therefore, in a conventional mobile communication system, it is usual to perform change control of the transmission rate of uplink user data on the order of several hundred ms to several s seconds.

  Therefore, in the conventional mobile communication system, as shown in FIG. 15 (a), when performing bursty data transmission, as shown in FIG. 15 (b), low speed, high delay and low transmission efficiency are allowed. As shown in FIG. 15 (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. 15, it is assumed that both the above-described radio band resource and hardware resource are applied to the uplink 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 uplink radio resources, the layer 1 and the MAC sublayer between the radio base station NodeB and the mobile station UE High-speed uplink 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)”.

  A mobile communication system to which “uplink enhancement” is applied will be described with reference to FIG.

  As shown in the example of FIG. 17, in the mobile communication system, in order to perform retransmission control (HARQ: Hybrid Automatic Repeat Request) of uplink user data, a cell managed by the radio base station NodeB is an E that is a delivery confirmation channel. -It is configured to transmit EICH (E-DCH HARQ Acknowledgment Indicator Channel).

  That is, in such a mobile communication system, a cell managed by a radio base station NodeB performs error detection (CRC check) on uplink user data transmitted via E-DPDCH (Enhanced Dedicated Physical Data Channel), and receives the data. The mobile station UE is configured to perform retransmission control of uplink user data by notifying the mobile station UE of an acknowledgment signal (ACK) or a reception negative signal (NACK) using E-HICH.

  Specifically, as illustrated in FIG. 17, when the mobile station UE that has transmitted E-DPDCH # 1 to cell # 2 receives E-HICH # 1 (ACK) from cell # 2, the subsequent E-DPDCH To cell # 2. On the other hand, when receiving the E-HICH # 1 (NACK) from the cell # 2, the mobile station UE is configured to retransmit the transmitted uplink user data E-DPDCH # 1 to the cell # 2.

  On the other hand, in such a mobile communication system, closed loop transmission power control using a TPC (Transmit Power Control) command is known as an example of a transmission power control method of a downlink dedicated physical channel (DPCH) transmitted from a radio base station NodeB. It has been.

  With reference to FIG. 18A, the closed-loop transmission power control using the TPC command will be described. As illustrated in FIG. 18A, the mobile station UE that has received the downlink DPCH transmitted from the cell # 2 receives the cell # managed by the radio base station NodeB # 1 based on the received power of the downlink DPCH received. The transmission power of the downlink DPCH in 2 is determined to be increased and the determined increase / decrease result is transmitted to the cell # 2 by a TPC command (for example, UP / Keep / Down command).

  Cell # 2 is configured to control the transmission power of the downlink DPCH to be transmitted to the mobile station UE using the TPC command transmitted from the mobile station UE.

  Further, in the mobile communication system, the cell # 2 is configured to determine the above-described E-HICH transmission power based on the downlink DPCH transmission power and a predetermined offset (E-HICH offset). .

  Therefore, in the mobile communication system, the reception power of the downlink DPCH is improved in the mobile station UE by the transmission power control using the TPC command, so that the reception power of the E-HICH depending on the downlink DPCH is also improved. It is comprised so that it may become.

  Next, transmission power control using a TPC command in a mobile communication system in a soft handover (hereinafter referred to as SHO) state will be described with reference to FIG.

  In such a mobile communication system, as shown in FIG. 18B, the mobile station UE transmits from the cell # 2 and the cell # 4 in the SHO state in which the radio link with the cell # 2 and the cell # 4 is set. Mobile station UE combines DPCH # 1 received from cell # 2 and cell # 4, and based on the received power of combined DPCH # 1, cell # 2 and An increase / decrease in the transmission power of DPCH # 1 in cell # 4 is determined.

  And this mobile station UE is comprised so that the determined increase / decrease result may be transmitted to cell # 2 and cell # 4 using a TPC command.

  In this mobile communication system, the transmission power of E-HICH # 1 transmitted from cell # 2 is set to the transmission power of DPCH # 1 transmitted from cell # 2 and a predetermined offset (E-HICH offset). It is comprised so that it may be determined based on.

  Further, the transmission power of E-HICH # 2 transmitted from cell # 4 is determined based on the transmission power of DPCH # 2 transmitted from cell # 4 and a predetermined offset (E-HICH offset). It is configured.

  Also, as shown in FIG. 18 (b), in the mobile communication system, when the mobile station UE is in the SHO state in which the radio link with the cell # 2 and the cell # 4 is set, Even if the reception power of DPCH # 1 transmitted from cell # 4 is insufficient, if the reception power of DPCH # 1 transmitted from cell # 2 is good, reception of synthesized DPCH # 1 Since the power became good, it was possible to receive DPCH # 1.

Therefore, in such a case, the mobile station UE does not need to increase the transmission power of DPCH # 1, and therefore does not transmit a TPC command (for example, an UP command) that increases the transmission power of DPCH # 1 from cell # 4. .
3GPP TSG-RAN R2-05-1398

  In such a case, as shown in FIG. 19, since the transmission power of E-HICH # 2 transmitted from cell # 4 depends on the transmission power of DPCH # 1 transmitted from cell # 4, in mobile station UE, When the received power of DPCH # 1 is insufficient, the received power of E-HICH # 2 is also insufficient.

  Therefore, in the mobile communication system, the mobile station UE receives E-HICH # 1 transmitted from the cell # 2 when the mobile station UE is in the SHO state in which the radio links with the cell # 2 and the cell # 4 are set. However, E-HICH # 2 transmitted from cell # 4 could not be received.

  Therefore, as shown in FIG. 19, when cell # 4 transmits E-HICH # 2 (NACK) to E-DPDCH # 1 transmitted by mobile station UE, mobile station UE uses E-DPDCH # There is a problem in that subsequent uplink user data is transmitted based on E-HICH # 1 (ACK) transmitted from cell # 2 without retransmitting 1.

  Therefore, the present invention has been made in view of the above points, and provides a transmission power control method and a mobile communication system that can reliably reach E-HICH to a mobile station UE even in the SHO state. With the goal.

A first feature of the present invention is a transmission power control method for controlling transmission power of an acknowledgment channel for uplink user data transmitted to a mobile station by a cell managed by a radio base station, wherein the mobile station If not in soft handover state, the cell determines transmission power of the delivery confirmation channel based on an offset in non-soft handover state, and transmits the delivery confirmation channel to the mobile station; The circuit control station manages the first cell and the second cell that the mobile station is in a soft handover state in which a radio link is established with the first cell and the second cell. Notifying one or more radio base stations;
In response to the notification, the first cell determines a transmission power of a first acknowledgment channel based on an offset in a soft handover state that is greater than an offset in the non-soft handover state, Transmitting an acknowledgment channel to the mobile station; and the second cell is responsive to the notification based on an offset in a soft handover state that is greater than an offset in the non-soft handover state. And determining the transmission power of the second acknowledgment channel and transmitting the second acknowledgment channel to the mobile station.

  A second feature of the present invention is a mobile communication system that controls transmission power of an acknowledgment channel for uplink user data transmitted to a mobile station by a cell managed by a radio base station, wherein the mobile station is a software If not in a handover state, the cell is configured to determine a transmission power of the acknowledgment channel based on an offset in a non-soft handover state and transmit the acknowledgment channel to the mobile station; The radio network controller manages the first cell and the second cell that the mobile station is in a soft handover state in which a radio link is established with the first cell and the second cell. Configured to notify one or more radio base stations, wherein the first cell is responsive to the notification in the non-soft handover state. Configured to determine a transmission power of a first acknowledgment channel based on an offset in a soft handover state that is greater than a offset, and to transmit the first acknowledgment channel to the mobile station; In response to the notification, the cell determines a transmission power of the second acknowledgment channel based on an offset in the soft handover state that is larger than the offset in the non-soft handover state, and the second acknowledgment channel Is configured to transmit to the mobile station.

  As described above, according to the present invention, it is an object to provide a transmission power control method and a mobile communication system that can reliably reach E-HICH to a mobile station UE even in the SHO state.

(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 FIG. 1 to FIG. The mobile communication system according to the present embodiment is designed for the purpose of improving communication performance such as communication capacity and communication quality. In addition, the mobile communication system according to the present embodiment is applicable to “W-CDMA” and “CDMA2000” which are third generation mobile communication systems.

  FIG. 1 shows a schematic configuration example of a mobile station UE according to the present embodiment. As shown in FIG. 1, the mobile station UE includes a bus interface unit 11, a call processing control unit 12, a baseband signal processing unit 13, a transmission / reception unit 14, and a transmission / reception antenna 15. Further, the mobile station UE may be configured to include an amplifier unit (not shown).

  However, these configurations do not necessarily have to exist independently as hardware. That is, the components may be combined or may be configured by a software process.

  FIG. 2 shows functional blocks of the baseband signal processing unit 13. As shown in FIG. 2, the baseband signal processing unit 13 includes an upper layer function unit 131, an RLC function unit 132 that functions as an RLC sublayer, a MAC-d function unit 133, a MAC-e function unit 134, 1 and a layer 1 function unit 135 functioning as 1.

  As shown in FIG. 3, the RLC function unit 132 divides application data (RLC SDU) received from the upper layer function unit 131 into a predetermined PDU size, and uses an RLC header used for order rearrangement processing, retransmission processing, and the like. Is generated, and the RLC PDU is generated and passed to the MAC-d function unit 133.

  Here, a pipe that functions as a bridge between the RLC function unit 132 and the MAC-d function unit 133 is referred to as a “logical channel”. Logical channels are classified according to the contents of data to be transmitted and received, and when performing communication, a single connection can have a plurality of logical channels. That is, a plurality of contents data (for example, control data and user data) can be transmitted and received logically in parallel.

  The MAC-d functional unit 133 generates a MAC-d PDU by multiplexing logical channels and adding a MAC-d header accompanying the multiplexing. A plurality of MAC-d PDUs are transferred from the MAC-d function unit 133 to the MAC-e function unit 134 as a MAC-d flow.

  The MAC-e function unit 134 generates a transport block by adding a MAC-e header to a plurality of MAC-d PDUs received from the MAC-d function unit 133 as a MAC-d flow. The transport block is passed to the layer 1 function unit 135 via the transport channel.

  The MAC-e function unit 134 functions as a lower layer of the MAC-d function unit 133, and performs a retransmission control function by hybrid ARQ (HARQ) and a transmission rate control function.

  Specifically, as illustrated in FIG. 4, the MAC-e function unit 134 includes a multiplexing unit 134a, an E-TFC selection unit 134b, and a HARQ processing unit 134c.

  The multiplexing unit 134a multiplexes the uplink user data received as the MAC-d flow from the MAC-d function unit 133 based on the E-TFI (Enhanced-Transport Format Indicator) notified from the E-TFC selection unit 134b. It is configured to generate the uplink user data (transport block) to be transmitted through the transport channel (E-DCH) and transmit it to the HARQ processing unit 134c.

  Hereinafter, the uplink user data received as the MAC-d flow is referred to as “uplink user data (MAC-d flow)”, and the uplink user data to be transmitted via the transport channel (E-DCH) is referred to as “uplink user data ( E-DCH) ".

  Here, E-TFI is an identifier of a transport format that is a format for supplying a transport block for each TTI on the transport channel (E-DCH), and is given to the MAC-e header described above. is there.

  Further, the multiplexing unit 134a is configured to determine the transmission data block size applied to the uplink user data based on the E-TFI notified from the E-TFC selection unit 134b and notify the HARQ processing unit 134c. Has been.

  When the multiplexing unit 134a receives uplink user data as a MAC-d flow from the MAC-d function unit 133, the multiplexing unit 134a sets E-TFC selection information for selecting a transport format for the uplink user data as E-TFC. The TFC selection unit 134b is notified.

  Here, the E-TFC selection information corresponds to the data size or priority class of the uplink user data.

  The HARQ processing unit 134c converts the uplink user data (E-DCH) to the uplink user data (E-DCH) based on the ACK / NACK for the uplink user data notified from the layer 1 function unit 135 by the N-channel stop-and-wait (N-SAW) protocol. The retransmission control process is configured to be performed. Here, FIG. 5 shows an operation example of the stop-and-wait protocol of 4 channels.

  Also, the HARQ processing unit 134c transmits the uplink user data (E-DCH) received from the multiplexing unit 134a and HARQ information (for example, retransmission number) used for HARQ processing to the layer 1 function unit 135. It is configured.

  The E-TFC selection unit 134b is configured to determine a transmission rate of the uplink user data by selecting a transport format (E-TF) applied to the uplink user data (E-DCH).

  Specifically, the E-TFC selection unit 134b receives scheduling information (for example, an absolute transmission rate or a relative transmission rate of uplink user data) received from the radio base station NodeB, or a MAC passed from the MAC-d function unit 133. -D Transmission execution or transmission of uplink user data based on the data amount of PDU (data size of uplink user data), the state of hardware resources of the radio base station NodeB managed in the MAC-e function unit 134, etc. The stop is determined, and further, the transport format (E-TF) applied to the transmission of the uplink user data is selected, and the E-TFI for identifying the transport format is selected as the layer 1 function unit 135 and the multiplexing unit. It is comprised so that it may notify to 134a.

  For example, the E-TFC selection unit 134b stores the transmission rate of the uplink user data and the transport format in association with each other, and updates the transmission rate of the uplink user data based on the scheduling information from the layer 1 function unit 135. Thus, the layer 1 function unit 135 and the multiplexing unit 134a are notified of the E-TFI for identifying the transport format associated with the updated transmission rate of the uplink user data.

  Here, when the E-TFC selection unit 134b receives the absolute transmission rate of the uplink user data from the serving cell of the mobile station UE as scheduling information via the E-AGCH, the E-TFC selection unit 134b sets the uplink user data transmission rate to the uplink user data. Change to the absolute transmission rate of user data.

  In addition, when the E-TFC selection unit 134b receives the relative transmission rate (UP command or DOWN command) of the uplink user data from the non-serving cell of the mobile station UE as scheduling information via the E-RGCH, Is increased or decreased by a predetermined rate based on a relative transmission rate of the uplink user data.

  In this specification, the transmission rate of the uplink user data may be a rate at which the uplink user data can be transmitted via the E-DPDCH, or the transmission data block size (TBS) for transmitting the uplink user data. It may be the transmission power of E-DPDCH, or the transmission power ratio (transmission power offset) between E-DPDCH and DPCCH (Dedicated Physical Control Channel).

  As shown in FIG. 6, the layer 1 functional unit 135 includes a transmission channel encoding unit 135a, a physical channel mapping unit 135b, an E-DPDCH transmission unit 135c, an E-DPCCH transmission unit 135d, and an E-HICH reception unit. 135e, an E-RGCH receiving unit 135f, an E-AGCH receiving unit 135g, a physical channel demapping unit 135h, and a DCDCH transmitting unit 135i.

  As illustrated in FIG. 7, the transmission channel encoding unit 135a includes an FEC (Forward Error Collection) encoding unit 135a1 and a transmission rate matching unit 135a2.

  As shown in FIG. 7, the FEC encoding unit 135a1 performs error correction encoding processing on the uplink user data (E-DCH) transmitted from the MAC-e function unit 134, that is, the transport block. It is configured.

  Further, as shown in FIG. 7, the transmission rate matching unit 135a2 performs “repetition (bit repetition)” or “puncture” for adjusting the transmission capacity of the physical channel to the transport block subjected to the error correction coding process. (Thinning of bits) ".

  The physical channel mapping unit 135b maps the uplink user data (E-DCH) from the transmission channel coding unit 135a to the E-DPDCH, and the E-TFI and HARQ information from the transmission channel coding unit 135a to the E-DPCCH. Configured to map.

  The E-DPDCH transmission unit 135c is configured to perform transmission processing for the above-described E-DPDCH, and the E-DPCCH transmission unit 135d is configured to perform transmission processing for the above-described E-DPCCH. Yes.

  The E-HICH receiving unit 135e is configured to receive an E-HICH (E-DCH HARQ Acknowledgment Indicator Channel) transmitted from the radio base station NodeB.

  The E-RGCH receiving unit 135f is configured to receive the E-RGCH transmitted from the radio base station NodeB (the serving cell and the non-serving cell of the mobile station UE).

  The E-AGCH receiving unit 135g is configured to receive E-AGCH transmitted from the radio base station NodeB (serving cell of the mobile station UE).

  The physical channel demapping unit 135h is configured to extract an ACK / NACK for uplink user data included in the E-HICH received by the E-HICH receiving unit 135e and transmit the ACK / NACK to the MAC-e function unit 134. Yes.

  Further, the physical channel demapping unit 135h extracts scheduling information (relative transmission rate of uplink user data, that is, UP command / DOWN command) included in the E-RGCH received by the E-RGCH receiving unit 135f, and performs MAC processing. -E It is comprised so that it may transmit to the function part 134.

  Further, the physical channel demapping unit 135h extracts scheduling information (absolute transmission rate of uplink user data) included in the E-AGCH received by the E-AGCH receiving unit 135g and transmits the extracted scheduling information to the MAC-e function unit 134. It is configured as follows.

  The DCDCH transmission unit 135i is configured to perform a transmission process on an uplink user data transmission dedicated physical channel (DPDCH: Dedicated Physical Data Channel) for transmitting uplink user data transmitted by the mobile station.

  The uplink user data includes a measurement report (Measurement report) of the reception power of the common pilot signal transmitted from the cell.

  FIG. 8 is a functional block configuration example of the radio base station NodeB according to the present embodiment. As shown in FIG. 8, the radio base station NodeB according to this embodiment includes an HWY interface 21, a baseband signal processing unit 22, a transmission / reception unit 23, an amplifier unit 24, a call processing control unit 26, and a transmission / reception antenna. 25.

  The HWY interface 21 is configured to receive downlink user data to be transmitted from the radio network controller RNC located above the radio base station NodeB and input the downlink user data to the baseband signal processing unit 22. The HWY interface 21 is configured to transmit the uplink user data from the baseband signal processing unit 22 to the radio network controller RNC.

  The baseband signal processing unit 22 is configured to transmit baseband signals including the downlink user data to the transmission / reception unit 23 after performing layer 1 processing such as channel coding processing and spreading processing on the downlink user data. Has been.

  In addition, the baseband signal processing unit 22 performs layer 1 processing such as despreading processing, RAKE combining processing, and error correction decoding processing on the baseband signal from the baseband signal processing unit 22, and then obtains the baseband signal. The uplink user data is transmitted to the HWY interface 21.

  The transmission / reception unit 23 is configured to convert the baseband signal from the baseband signal processing unit 22 into a radio frequency band signal. The transmission / reception unit 23 is configured to convert the radio frequency band signal from the amplifier unit 24 into a baseband signal.

  The amplifier unit 24 is configured to amplify the radio frequency band signal from the transmission / reception unit 23 and transmit it via the transmission / reception antenna 25. The amplifier unit 24 is configured to amplify a signal received by the transmission / reception antenna 25 and transmit the amplified signal to the transmission / reception unit 23.

  The call processing control unit 26 transmits / receives a call processing control signal to / from the radio network controller RNC, performs state management of each functional unit of the radio base station NodeB, processing such as hardware resource allocation by layer 3 and the like. Is configured to do.

  FIG. 9 is a functional block diagram of the baseband signal processing unit 22. As shown in FIG. 9, the baseband signal processing unit 22 includes a layer 1 function unit 221 and a MAC-e function unit 222.

  As shown in FIG. 10, the layer 1 functional unit 221 includes an E-DPCCH despreading / RAKE combining unit 221a, an E-DPCCH decoding unit 221b, an E-DPDCH despreading / RAKE combining unit 221c, a buffer 221d, Re-despreading section 221e, HARQ buffer 221f, error correction decoding section 221g, transmission channel encoding section 221h, physical mapping section 221i, E-HICH transmitting section 221j, E-AGCH transmitting section 221k, E -An RGCH transmission unit 221l, a DPDCH despreading / RAKE combining unit 221m, a DPDCH decoding unit 221n, and a DPCH transmission unit 221o are provided.

  Note that these configurations do not necessarily have to exist independently as hardware. That is, the components may be combined or may be configured by a software process.

  The E-DPCCH despreading / RAKE unit 221a is configured to perform despreading processing and RAKE combining processing on the E-DPCCH.

  The E-DPCCH decoding unit 221b, based on the output from the E-DPCCH despreading / RAKE unit 221a, determines E-TFCI (or E-TFRI: Enhanced Transport Format and Resource) for determining the transmission rate of uplink user data. (Indicator) is decoded and transmitted to the MAC-e function unit 222.

  The E-DPDCH despreading / RAKE combining unit 221c performs despreading processing on the E-DPDCH using the spreading factor (minimum spreading factor) corresponding to the highest rate that the E-DPDCH can take and the number of multicodes. And is configured to accumulate in the buffer 221d. By performing the despreading process using the spreading factor and the number of multicodes, it is possible to secure resources so that the mobile station UE can receive up to the maximum rate (bit rate) that can be taken.

  The re-despreading unit 221e performs re-despreading processing on the data stored in the buffer 221d using the spreading factor and the number of multicodes notified from the MAC-e function unit 222, and stores the data in the HARQ buffer 221f. It is configured to accumulate.

  Based on the encoding rate notified from the MAC-e function unit 222, the error correction decoding unit 221g performs uplink user data (E) obtained by performing error correction decoding processing on the data stored in the buffer 221d. -DCH) is transmitted to the MAC-e function unit 222.

  The transmission channel coding unit 221h is configured to perform necessary coding processing on ACK / NACK and scheduling information for uplink user data received from the MAC-e function unit 222.

  The physical channel mapping unit 221i maps the ACK / NACK for uplink user data from the transmission channel encoding unit 221h to E-HICH, and the scheduling information (absolute transmission rate) from the transmission channel encoding unit 221h is E-AGCH. And the scheduling information (relative transmission rate) from the transmission channel encoding unit 221h is mapped to the E-RGCH.

  The E-HICH transmission unit 221j is configured to perform transmission processing for the above-described E-HICH. Also, the E-HICH transmission unit 221j transmits the E-HICH transmission power based on the first E-HICH offset or the second E-HICH offset notified from the scheduling unit 222c and the transmission power of the downlink DPCH. And the E-HICH is transmitted with the determined transmission power.

  Specifically, the transmission power of the downlink DPCH is acquired from the DPCH transmission unit 221o, and the first E-HICH offset or the second E-HICH offset notified from the scheduling unit 222c with respect to the transmission power of the DPCH The transmission power of E-HICH is determined by multiplying or adding.

  The first E-HICH offset and the second E-HICH offset will be described later.

  The E-AGCH transmission unit 221k is configured to perform transmission processing for the above-described E-AGCH, and the E-RGCH transmission unit 221l is configured to perform transmission processing for the above-described E-RGCH. Yes.

  The DPDCH despreading / RAKE unit 221m is configured to perform despreading processing and RAKE combining processing on the DPDCH.

  The DPDCH decoding unit 221n decodes the uplink user data transmitted from the mobile station UE based on the output from the DPDCH despreading / RAKE unit 221m, and sends it to the MAC-e functional unit 222 via the DCH (Dedicated Channel). Configured to send.

  Here, the uplink user data described above includes a measurement report (Measurement report) of the reception power of the common pilot signal transmitted from the mobile station UE.

  The DPCH transmission unit 221o is configured to perform transmission processing for a downlink dedicated physical channel (DPCH) transmitted from the radio base station NodeB.

  Further, the DPCH transmission unit 221o is configured to notify the downlink DPCH transmission power to the E-HICH transmission unit 221j.

  As shown in FIG. 11, the MAC-e function unit 222 includes a HARQ processing unit 222a, a reception processing command unit 222b, a scheduling unit 222c, and a demultiplexing unit 222d.

  The HARQ processing unit 222a is configured to receive the uplink user data (E-DCH) and HARQ information received from the layer 1 function unit 221 and perform HARQ processing for the uplink user data (E-DCH). Yes.

  Further, the HARQ processing unit 222a is configured to notify the layer 1 function unit 221 of ACK / NACK (for uplink user data) indicating the reception processing result for the uplink user data (E-DCH). The HARQ processing unit 222a is configured to notify the scheduling unit 222c of ACK / NACK (for uplink user data) for each process.

  The reception processing command unit 222b re-reads the spreading factor and the number of multicodes related to the transport format of each mobile station UE specified by the E-TFCI for each TTI received from the E-DPCCH decoding unit 221b of the layer 1 function unit 221. The despreading unit 221e and the HARQ buffer 221f are notified, and the coding rate is notified to the error correction decoding unit 221g.

  The scheduling unit 222c is based on E-TFCI for each TTI received from the E-DPCCH decoding unit 221b of the layer 1 function unit 221, ACK / NACK for each process received from the HARQ processing unit 222a, an interference level, and the like. The absolute transmission rate or the relative transmission rate of the above-described uplink user data is changed.

  The scheduling unit 222c is configured to notify the layer 1 function unit 221 of the uplink user data absolute transmission rate or relative transmission rate as scheduling information via the DCH.

  The scheduling unit 222c is configured to receive the SHO state transmitted from the radio network controller RNC and indicating that the mobile station UE is in the SHO state. The scheduling unit 222c may be configured to receive an SHO state indicating that the mobile station UE is not in the SHO state.

  The scheduling unit 222c is configured to store the first E-HICH offset and the second E-HICH offset.

  A 1st E-HICH offset is an E-HICH offset in the non-SHO state used when determining the transmission power of E-HICH, when the mobile station UE is not SHO. Further, the second E-HICH offset is an E-HICH offset in the SHO state used when determining the transmission power of E-HICH when the mobile station UE is SHO.

  The second E-HICH offset is a transmission power ratio between E-HICH and downlink DPCH, and is set to be larger than the first E-HICH offset.

  Here, when the scheduling unit 222c receives the above-described SHO state indicating that the mobile station UE is in the SHO state, the scheduling unit 222c transmits the first E-HICH offset to the layer 1 function unit 221 via the DCH as transmission power information. Configured to notify.

  Further, when receiving the SHO state indicating that the mobile station UE is not in the SHO state, the scheduling unit 222c notifies the layer 1 function unit 221 via the DCH of the second E-HICH offset as transmission power information. It is configured as follows.

    The demultiplexing unit 222d is configured to transmit the uplink user data acquired by performing the demultiplexing process on the uplink user data (E-DCH) received from the HARQ processing unit 222a to the HWY interface 21. Yes.

  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. 12, the radio network controller RNC according to the present embodiment includes an exchange interface 31, an LLC layer processing unit 32, a MAC layer processing unit 33, a media signal processing unit 34, and a radio base station interface. 35 and a call processing control unit 36.

  The switching center interface 31 is an interface with the switching center 1. The switching center interface 31 is configured to transfer the downlink signal transmitted from the switching center 1 to the LLC layer processing unit 32 and transfer the uplink signal transmitted from the LLC layer processing unit 32 to the switching center 1. Yes.

  The LLC layer processing unit 32 is configured to perform LLC (Logical Link Control) sublayer processing such as header or trailer combining processing such as sequence pattern numbers. The LLC layer processing unit 32 is configured to transmit the uplink signal to the exchange interface 31 and transmit the downlink signal to the MAC layer processing unit 33 after performing the LLC sublayer processing.

  The MAC layer processing unit 33 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 33 transmits the uplink signal to the LLC layer processing unit 32 and transmits the downlink signal to the radio base station interface 35 (or the media signal processing unit 34). Is configured to do.

  The media signal processing unit 34 is configured to perform media signal processing on audio signals and real-time image signals. After performing media signal processing, the media signal processing unit 34 is configured to transmit uplink signals to the MAC layer processing unit 33 and transmit downlink signals to the radio base station interface 35.

  The radio base station interface 35 is an interface with the radio base station NodeB. The radio base station interface 35 transfers the uplink signal transmitted from the radio base station NodeB to the MAC layer processing unit 33 (or media signal processing unit 34), and the MAC layer processing unit 33 (or media signal processing unit 34). ) Is transmitted to the radio base station NodeB.

  The call processing control unit 36 is configured to perform radio resource management processing, channel setting and release processing by layer 3 signaling, and the like. Here, the radio resource management includes call admission control, handover control, and the like.

(Operation of the mobile communication system according to the first embodiment of the present invention)
Hereinafter, the operation of the mobile communication system according to the present embodiment will be described with reference to FIG. 13 and FIG. Specifically, in the mobile communication system according to the present embodiment, an operation for controlling the transmission power of the uplink user data acknowledgment channel (E-HICH) will be described.

Note that the radio base station NodeB according to the present embodiment is configured to manage one or a plurality of cells. In addition, the cell according to the present embodiment will be described using an example in which the function of the radio base station NodeB is provided. First, the mobile station UE is in a state where a radio link is set only with the cell # 10 (non- The operation in which the cell # 10 controls the transmission power of the E-HICH is illustrated by taking as an example a case where the wireless link with the cell # 10 and the cell # 20 is set (SHO state) from the SHO state) .

  Here, the radio link in the present embodiment includes DPCH and E-DPDCH between the mobile station UE and the cell. Therefore, in the present embodiment, the case where the mobile station UE sets a radio link with only one cell is set as a non-SHO state, and the case where a plurality of cells and radio links are set is set as an SHO state as follows. .

  Moreover, cell # 10 in FIGS. 13 and 14 is a serving cell of mobile station UE, and # 20 is a non-serving cell of mobile station UE.

  Further, the cell # 10 and the cell # 20 in the present embodiment may be configured to be managed by the same radio base station NodeB, or different radio base station NodeBs in the cell # 10 and the cell # 20. It may be configured to be managed by.

  As shown in FIG. 13, in step S1001, the mobile station UE establishes a data connection (E-DPDCH) for transmitting uplink user data with the radio network controller RNC via the cell # 10.

  In this case, cell # 10 determines the transmission power of E-HICH based on the transmission power of downlink DPCH and the first E-HICH offset.

  Specifically, the cell # 10 multiplies or adds the first E-HICH offset stored in the scheduling unit 222c to the transmission power of the downlink DPCH subjected to the closed-loop transmission power control, thereby obtaining E- The transmission power of HICH is determined.

  In step S1002, the mobile station UE transmits a measurement report (Measurement report) to the radio network controller RNC when the reception power of the common pilot signal from the cell # 20 becomes a predetermined value or more.

  In step S1003, the radio network controller RNC synchronizes the uplink radio link between the mobile station UE and the cell # 20 to the radio base station Node B # 2 that manages the cell # 20 based on the measurement report. Request to do.

  Specifically, the radio network controller RNC, with respect to the radio base station NodeB # 2 that manages the cell # 20, channelization code that identifies the channel configuration in the uplink radio link and scrambling that identifies the mobile station UE A request to synchronize the uplink radio link between the mobile station UE and the cell # 20 is transmitted by transmitting a SHO setting request including the code.

  In step S1004, the radio base station NodeB # 2 that manages the cell # 20 establishes uplink radio link synchronization between the mobile station UE and the cell # 20.

  Specifically, the radio base station NodeB # 2 that manages the cell # 20 is transmitted from the mobile station UE in the uplink radio link using the channelization code and scrambling code received from the radio network controller RNC. By detecting the active channel, uplink radio link synchronization between the mobile station UE and the cell # 20 is established. When the uplink radio link synchronization between the mobile station UE and the cell # 20 is established, the radio base station NodeB # 2 that manages the cell # 20 transmits an SHO setting response to the radio network controller RNC. Further, the cell # 20 starts transmission of DPCH or the like on the downlink radio link to the mobile station UE.

  In step S1005, the radio network controller RNC requests the mobile station UE to synchronize the downlink radio link between the cell # 20 and the mobile station UE.

  Specifically, the radio network controller RNC transmits an SHO setting request including a channelization code for identifying the channel configuration in the downlink radio link and a scrambling code for identifying cell # 20 to the mobile station UE. To request to synchronize the downlink radio link between the cell # 20 and the mobile station UE.

  In step S1006, the mobile station UE establishes downlink radio link synchronization between the cell # 20 and the mobile station UE.

  Specifically, the mobile station UE uses the channelization code and scrambling code received from the radio network controller RNC to detect the channel from the cell # 20 in the downlink radio link, thereby detecting the cell # 20. And establishes downlink radio link synchronization between the mobile station UE and the mobile station UE. When synchronization of the downlink radio link between the cell # 20 and the mobile station UE is established, the mobile station UE transmits an SHO setting response to the radio network controller RNC.

  In step S1007, the radio network controller RNC moves the mobile station UE from the non-SHO state to the radio base station NodeB # 1 that manages the cell # 10 and the radio base station NodeB # 2 that manages the cell # 20. An SHO state notification for notifying the transition to the SHO state is transmitted.

  In step S1008, the cell # 10 recognizes that the mobile station UE has transitioned to the SHO state, and the cell # 10 performs the E-HICH based on the second E-HICH offset stored in the scheduling unit 222c. Determine the transmission power.

  On the other hand, the cell # 20 also recognizes that the mobile station UE has transitioned to the SHO state, and determines the transmission power of E-HICH based on the second E-HICH offset stored in the scheduling unit 222c.

  Thus, when the mobile station UE that is the transmission destination of E-HICH is in the SHO state, the cell # 10 and the cell # 20 use the second E-HICH offset that is larger than the first E-HICH offset. By increasing the transmission power of E-HICH, the E-HICH can reach the mobile station UE in the SHO state.

  Second, the mobile station UE transitions from the SHO state in which the radio link between the cell # 10 and the cell # 20 is set to the non-SHO state in which the radio link is set only with the cell # 10, and the cell # 10 shows the operation of controlling the transmission power of E-HICH.

  As shown in FIG. 14, in step S2001, when the reception power of the common pilot signal from the cell # 20 becomes less than a predetermined value, the mobile station UE sends a measurement report (Measurement report) to the radio network controller RNC. Send to.

  In step S2002, the radio network controller RNC sets up an uplink radio link between the mobile station UE and the cell # 20 with respect to the radio base station Node B # 2 that manages the cell # 20 based on the measurement report. Request to stop. In addition, the radio network controller RNC transmits an SHO release request to the mobile station UE, and requests the mobile station UE to stop setting the downlink radio link between the cell # 20 and the mobile station UE.

  In step S2003, the radio network controller RNC moves the mobile station UE from the SHO state to the radio base station NodeB # 1 that manages the cell # 10 and the radio base station NodeB # 2 that manages the cell # 20. An SHO state notification for notifying the transition to the SHO state is transmitted.

  In step S2004, the cell # 10 recognizes that the mobile station UE has transitioned to the non-SHO state, and the cell # 10 determines that the E-HICH offset is stored based on the first E-HICH offset stored in the scheduling unit 222c. The transmission power of HICH is determined.

  Thus, cell # 10 adjusts the transmission power of E-HICH by using the first E-HICH offset when the mobile station UE that is the transmission destination of E-HICH is in the non-SHO state. The wireless line capacity can be used effectively.

(Operations and effects of the mobile communication system according to the first embodiment of the present invention)
As described above, according to the transmission power control method and the mobile communication system according to the present invention, when the mobile station UE is in the SHO state, the radio base station NodeB that manages the cell sets the E-HICH offset. Since the transmission power of the E-HICH can be increased, the E-HICH can surely reach the mobile station UE.

FIG. 3 is a functional block diagram of a mobile station according to the first embodiment of the present invention. FIG. 3 is a functional block diagram of a baseband signal processing unit of the mobile station according to the first embodiment of the present invention. It is a figure for demonstrating the function of the baseband signal processing part of the mobile station which concerns on the 1st Embodiment of this invention. It is a functional block diagram of the MAC-e function part in the baseband signal processing part of the mobile station which concerns on the 1st Embodiment of this invention. It is a figure which shows the operation example of the stop and wait protocol of 4 channels performed by the HARQ process part of the MAC-e function part in the baseband signal process part of the mobile station which concerns on the 1st Embodiment of this invention. It is a functional block diagram of the layer 1 function part in the baseband signal processing part of the mobile station which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the function of the layer 1 function part in the baseband signal processing part of the mobile station which concerns on the 1st Embodiment of this invention. FIG. 3 is a functional block diagram of a radio base station according to the first embodiment of the present invention. It is a functional block diagram of the baseband signal processing part of the wireless base station which concerns on the 1st Embodiment of this invention. It is a functional block diagram of the layer 1 function part in the baseband signal processing part of the wireless base station which concerns on the 1st Embodiment of this invention. It is a functional block diagram of the MAC-e function part in the baseband signal processing part of the wireless base station which concerns on the 1st Embodiment of this invention. 2 is a functional block diagram of a radio network controller RNC according to the first embodiment of the present invention. FIG. It is a sequence diagram which shows an example of the transmission power control method which concerns on the 1st Embodiment of this invention. It is a sequence diagram which shows an example of the transmission power control method which concerns on the 1st Embodiment of this invention. 1 is an overall configuration diagram of a general mobile communication system. It is a figure for demonstrating the method to control transmission power in the mobile communication system which concerns on a prior art. It is a whole block diagram of the mobile communication system which concerns on a prior art. It is a figure for demonstrating the transmission power control method in the mobile communication system which concerns on a prior art. It is a figure for demonstrating the transmission power control method in the mobile communication system which concerns on a prior art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Mobile station UE, 11 ... Bus interface part, 12 ... Call processing control part, 13 ... Baseband signal processing part, 131 ... Upper layer functional part, 132 ... RLC functional part, 133 ... MAC-d functional part, 134 ... MAC-e functional unit, 134a ... multiplexing unit, 134b ... E-TFC selection unit, 134c ... HARQ processing unit, 135 ... layer 1 functional unit, 135a ... transmission channel coding unit, 135b ... physical channel mapping unit, 135c ... E -DPDCH transmitter, 135d ... E-DPCCH transmitter, 135e ... E-HICH receiver, 135f ... E-RGCH receiver, 135g ... E-AGCH receiver, 135h ... physical channel demapping unit, 135i ... DPDCH transmitter , 14 ... transmission / reception unit, 15 ... transmission / reception antenna, 2 ... radio base station NodeB, 21 ... HWY interface 22 ... baseband signal processing unit, 221 ... layer 1 functional unit, 221a ... E-DPCCH despreading / RAKE combining unit, 221b ... E-DPCCH decoding unit, 221c ... E-DPDCH despreading / RAKE combining unit, 221d ... buffer, 221e ... re-despreading unit, 221f ... HARQ buffer, 221g ... error correction decoding unit, 221h ... transmission channel coding unit, 221i ... physical channel mapping unit, 221j ... E-HICH transmission unit, 221k ... E- AGCH transmission unit, 221l ... E-RGCH transmission unit, 221m ... DPDCH despreading / RAKE combining unit, 221n ... DPDCH decoding unit, 221o ... DPCH transmission unit, 222 ... MAC-e functional unit, 222a-HARQ processing unit, 222b ... Reception processing command section, 222c ... scheduling section, 222d ... multiplexing 23. Transmission / reception unit, 24 ... Amplifier unit, 25 ... Transmission / reception antenna, 26 ... Call processing control unit, 31 ... Switching center interface, 32 ... LLC layer processing unit, 33 ... MAC layer processing unit, 34 ... Media signal processing 35, wireless base station interface, 36 ... call processing control unit

Claims (2)

  1. A transmission power control method for controlling transmission power of an acknowledgment channel for uplink user data transmitted to a mobile station by a cell managed by a radio base station,
    When the mobile station is not in the soft handover state, the cell determines the transmission power of the delivery confirmation channel based on the power offset for the downlink dedicated physical channel in the non-soft handover state, and moves the delivery confirmation channel to the mobile station. Transmitting to the station;
    The radio network controller manages the first cell and the second cell that the mobile station is in a soft handover state in which a radio link is established with the first cell and the second cell. Notifying one or more radio base stations to:
    In response to the notification, the first cell confirms a first delivery confirmation based on a power offset for the downlink dedicated physical channel in the soft handover state that is larger than a power offset for the downlink dedicated physical channel in the non-soft handover state. Determining a transmission power of a channel and transmitting the first acknowledgment channel to the mobile station;
    In response to the notification, the second cell confirms a second delivery confirmation based on a power offset for the downlink dedicated physical channel in the soft handover state that is greater than a power offset for the downlink dedicated physical channel in the non-soft handover state. Determining the transmission power of the channel and transmitting the second acknowledgment channel to the mobile station.
  2. A mobile communication system for controlling transmission power of an acknowledgment channel for uplink user data transmitted to a mobile station by a cell managed by a radio base station,
    When the mobile station is not in the soft handover state, the cell determines the transmission power of the delivery confirmation channel based on the power offset for the downlink dedicated physical channel in the non-soft handover state, and moves the delivery confirmation channel to the mobile station. Configured to transmit to the station,
    The radio network controller manages the first cell and the second cell that the mobile station is in a soft handover state in which a radio link is established with the first cell and the second cell. Configured to notify one or more radio base stations
    In response to the notification, the first cell receives a first delivery confirmation based on a power offset for the downlink dedicated physical channel in the soft handover state that is larger than a power offset for the downlink dedicated physical channel in the non-soft handover state. Configured to determine a transmission power of a channel and transmit the first acknowledgment channel to the mobile station;
    In response to the notification, the second cell receives a second delivery confirmation based on a power offset for the downlink dedicated physical channel in the soft handover state that is greater than a power offset for the downlink dedicated physical channel in the non-soft handover state. A mobile communication system configured to determine a transmission power of a channel and transmit the second acknowledgment channel to the mobile station.
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WO2006016775A2 (en) * 2004-08-11 2006-02-16 Lg Electronics Inc. Packet transmission acknowledgement in wireless communication system
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JP2004007030A (en) * 2002-04-03 2004-01-08 Nec Corp Cellular system, base station and mobile station, and communication control method
JP2004080530A (en) * 2002-08-20 2004-03-11 Matsushita Electric Ind Co Ltd Communication terminal device, base station device, and transmission power control method
JP2004080529A (en) * 2002-08-20 2004-03-11 Matsushita Electric Ind Co Ltd Transmission power control method, tpc command transmission method, and radio communication device
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