JP2006222699A - Transmission rate control method and mobile station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve the increased capacity of wireless channels and the improved the wireless quality by enhancing the interference reduction effect. <P>SOLUTION: A transmission rate control method disclosed herein includes: a step where a serving cell transmits an absolute rate grant channel; a step where a plurality of non-serving cells transmit relative rate grant channels; a step where a mobile station accumulates a value assigned to the relative rate grant channel used for decreasing the transmission rate among the relative rate grant channels received from a plurality of the non-serving cells for a prescribed time width; a step where the mobile station determines the transmission rate of uplink user data on the basis of the largest accumulated value and an absolute value included in the absolute rate grant channel; and a step where the mobile station increases the transmission rate of the uplink user data up to a maximum permissible transmission rate. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a transmission rate control method for controlling the transmission rate of uplink user data transmitted by a mobile station and the 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. 12, the radio network controller RNC normally controls all radio base stations NodeB in an integrated manner. Therefore, in the conventional mobile communication system, due to processing load, processing delay, etc. 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. 13 (a), when performing bursty data transmission, as shown in FIG. 13 (b), low speed, high delay and low transmission efficiency are allowed. As shown in FIG. 13 (c), radio resources for high-speed communication are secured, and idle radio bandwidth resources and hardware resources in the radio base station NodeB are wasted. Data is transmitted with permission.

  However, in FIG. 13, it is assumed that both the radio band resource and the hardware resource described above 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)”.

  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 allowable transmission rate, the maximum allowable transmission rate at the timing itself or a relative value of the maximum allowable transmission rate (for example, Up / Down / Hold three values) ).

  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.

  “Time & Rate Control” and “Rate Control per UE” may ideally be the best control method for improving the radio capacity in the uplink, but the amount of data remaining in the buffer of the mobile station UE In addition, since it is necessary to assign the transmission rate of user data after grasping the transmission power and the like in the mobile station UE, there is a problem that the control load by the radio base station NodeB increases.

  In addition, these radio resource control methods have a problem that overhead due to exchange of control signals becomes large.

  On the other hand, the “Rate Control per Cell” is a radio base station NodeB that broadcasts information common to cells, and each mobile station UE autonomously obtains the transmission rate of user data based on the received information. There is an advantage that the control load by the radio base station NodeB is small.

  However, since the radio base station NodeB needs to be configured so that any mobile station UE can receive user data in the uplink, in order to effectively use the radio capacity in the uplink, There has been a problem that the device scale of the radio base station NodeB increases.

  Therefore, for example, as shown in Non-Patent Document 1, the mobile station UE increases the transmission rate of user data from the initial transmission rate notified in advance according to a predetermined rule. A method (Autonomous ramping method) has been proposed in which a large amount of radio capacity is prevented and, as a result, an increase in the device scale of the radio base station NodeB is prevented.

  In such a scheme, the radio base station NodeB determines the maximum permissible transmission rate (or a parameter relating to the maximum permissible transmission rate based on hardware resources and radio resources (for example, the amount of interference in the uplink) in each cell. ) And control the transmission rate of user data in the mobile station in communication. Hereinafter, a control method based on hardware resources and a control method based on the amount of interference in the uplink will be specifically described.

  In the control scheme based on hardware resources, the radio base station NodeB is configured to notify the maximum allowable transmission rate to the mobile station UE connected to the subordinate cell.

  When the transmission rate of user data in the mobile station UE connected to the subordinate cell becomes high and hardware resources become insufficient, the radio base station NodeB sets the maximum allowable transmission rate to a low level. We try to avoid resource shortages.

  On the other hand, the radio base station NodeB sets the maximum allowable transmission rate to a higher value again when there is a surplus in hardware resources, such as when user data transmission in the mobile station UE connected to the subordinate cell is completed. To do.

  Further, in the control scheme based on the amount of interference in the uplink, the radio base station NodeB is configured to notify the maximum allowable transmission rate to the mobile station UE connected to the subordinate cell.

  In the radio base station NodeB, the transmission rate of user data in the mobile station UE connected to the subordinate cell becomes high, and the measurement interference amount (for example, noise rise) in the uplink is an allowable value (for example, maximum allowable noise rise). Is exceeded, the maximum allowable transmission rate is set low so that the amount of uplink interference falls within the allowable value (see FIG. 14).

  On the other hand, the radio base station NodeB has an allowable amount (for example, a maximum allowable noise rise) of the amount of interference (for example, noise rise) in the uplink, for example, when user data transmission in the mobile station UE connected to the subordinate cell is completed. ), The maximum allowable transmission rate is set again high (see FIG. 14).

  In the Autonomous ramping method, the extra cell interference from a mobile station or the like in the soft handover state increases, and as a result, the maximum allowable transmission rate of uplink user data (or a parameter related to the maximum allowable transmission rate) decreases, and the radio channel quality and throughput are reduced. It may be caused to deteriorate.

  Therefore, in the Autonomous ramping method, the mobile station UE receives a relative value (Down / Don't care) from a non-serving cell through a relative rate control channel (RGCH), and transmits the transmission rate of uplink user data. By suppressing the above, the above-described out-cell interference can be reduced.

  The mobile station UE accumulates the above-described relative value (Down) using a plurality of sliding windows, and the maximum allowable transmission rate (or the maximum allowable transmission rate) broadcasted by the absolute rate control channel (AGCH). The actual maximum allowable transmission rate is calculated by subtracting the accumulated value from the transmission rate parameter).

  Then, the mobile station UE increases the transmission rate of the uplink user data until the calculated maximum allowable transmission rate is reached.

In addition, when the transmission rate of the uplink user data exceeds the maximum allowable transmission rate, the mobile station UE returns the transmission rate of the uplink user data to the maximum allowable transmission rate.
3GPP TSG-RAN R1-040773

  However, in the conventional transmission rate control method, the handling of the instruction (Down / Don't care) transmitted on the relative rate control channel (RGCH) from a plurality of non-serving cells is not clearly defined.

  As a result, each mobile station that has received a relative rate control channel (RGCH) from multiple non-serving cells may operate differently, reducing the interference reduction effect and achieving highly accurate transmission rate control. There was a problem that it was not possible.

  Therefore, the present invention has been made in view of the above points, and provides a transmission rate control method and a mobile station that improve the interference reduction effect, increase the radio channel capacity, and improve the radio quality. Objective.

  A first feature of the present invention is a transmission rate control method for controlling a transmission rate of uplink user data transmitted by a mobile station, wherein a serving cell of the mobile station transmits the uplink user data to the mobile station. Transmitting an absolute rate control channel including an absolute value of the maximum allowable transmission rate of the mobile station, and a plurality of non-serving cells of the mobile station instructing the mobile station to change the maximum allowable transmission rate of the uplink user data Transmitting a relative speed control channel to reduce the maximum allowable transmission rate among the relative speed control channels received from the plurality of non-serving cells in a predetermined time width by the mobile station. Accumulating the value assigned to the relative speed control channel, and the mobile station assigns the largest accumulated value to the absolute speed control channel. And determining the maximum allowable transmission rate of the uplink user data based on the absolute value of the data, and the mobile station increases the transmission rate of the uplink user data to the maximum allowable transmission rate of the uplink user data. It has a summary of the process.

  A second feature of the present invention is a mobile station that transmits uplink user data, and receives an absolute rate control channel including an absolute value of a maximum allowable transmission rate of the uplink user data from a serving cell of the mobile station. A rate control channel receiver, a relative rate control channel receiver for receiving a relative rate control channel for instructing a change in the maximum allowable transmission rate of the uplink user data from a plurality of non-serving cells of the mobile station, and a predetermined rate Cumulative accumulation of values assigned to the relative rate control channel for reducing the maximum allowable transmission rate of the uplink user data among the relative rate control channels received from a plurality of non-serving cells of the mobile station in the time width. Based on the maximum accumulated value and the absolute value included in the absolute speed control channel. A maximum allowable transmission rate determining unit that determines a maximum allowable transmission rate of user data, and a transmission rate control unit that increases the transmission rate of the uplink user data to the maximum allowable transmission rate of the uplink user data. The gist.

  As described above, according to the present invention, it is possible to provide a transmission rate control method and a mobile station that can improve the interference reduction effect, increase the radio channel capacity, and improve the radio quality.

(Configuration of mobile communication system according to the first embodiment of the present invention)
With reference to FIG. 1 thru | or FIG. 9, the structure of the mobile communication system which concerns on the 1st Embodiment of this invention is demonstrated. The mobile communication system according to the present embodiment includes a plurality of radio base stations NodeB # 1 to # 5 and a radio network controller RNC as shown in FIG.

  In the mobile communication system according to the present embodiment, the mobile station UE sets the maximum allowable transmission rate of the uplink user data to be transmitted to the radio base station NodeB in the transmission time interval (TTI: Transmission Time Interval) unit in the uplink. Configured to control.

  Specifically, the mobile station UE employs the Autonomous ramping method, and is configured to automatically increase the transmission rate of the rising user data up to the maximum allowable transmission rate of the uplink user data.

  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.

  Therefore, 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) is configured as an enhanced dedicated physical channel (E-DPDCH: 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).

  In the mobile communication system according to the present embodiment, as shown in FIG. 1, the serving cell (cell # 4) of the mobile station UE sets the absolute value of the maximum allowable transmission rate of uplink user data to the mobile station UE. Including an absolute rate control channel (AGCH). Such an absolute rate control channel (AGCH) is a channel shared by a plurality of mobile stations UE.

  In the mobile communication system according to the present embodiment, a plurality of non-serving cells (cells # 1 to # 3) of the mobile station UE change the maximum allowable transmission rate of the uplink user data (Down / It is configured to transmit a relative speed control channel (RGCH) for instructing Don't care). Such a relative speed control channel (RGCH) is a channel shared by a plurality of mobile stations UE.

  As shown in FIG. 2, the mobile station UE according to this 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. 3, 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 process the user data transmitted from the call processing unit 32 in an upper layer of layer 2 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 a transmission format in the uplink based on the limit of the transmission power in the uplink.

  As shown in FIG. 4, 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 transmission formats (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 determined by the absolute value of the maximum allowable transmission rate (or a parameter relating to the maximum allowable transmission rate) of the mobile station UE notified by the absolute rate control channel (AGCH) or the relative rate control channel (RGCH). Relative value (Down / Don't care) for instructing the change of the maximum allowable transmission rate to be notified.

  In this specification, unless otherwise specified, it is assumed that the maximum allowable transmission rate includes a parameter related to the maximum allowable transmission rate (for example, the transmission power ratio described above).

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

  The E-TFC selector 33c1 determines the absolute value of the maximum allowable transmission rate included in the absolute rate control channel transmitted by the serving cell and the relative value (Down / Don ') included in the relative rate control channel transmitted by a plurality of non-serving cells. tcare), the maximum allowable transmission rate of the uplink user data in the next transmission time interval (TTI) is determined. Details of the method for determining the maximum allowable transmission rate of the uplink user data will be described later.

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

  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. 5, 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 more 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 is configured to perform a MAC layer process and a layer 1 process on user data acquired from the HWY interface 11 to generate a baseband signal and transfer the baseband signal to the transmission / reception unit 14. .

  Here, the downlink MAC layer processing includes 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 is configured to perform MAC layer processing and layer 1 processing on the baseband signal acquired from the transmission / reception unit 14, extract user data, and transfer the user data to the HWY interface 11. ing.

  Here, the MAC layer processing in the uplink includes MAC control processing, header discard processing, and the like. Also, the layer 1 processing in the downlink 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.

  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 illustrated in FIG. 6, 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, 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 MAC-d processing unit 122.

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

  As shown in FIG. 7, 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, and a MAC-hs function unit 123q.

  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 to acquire a transmission format number, information about HARQ, information about scheduling, and the like, and a MAC-e function unit It is configured to input to 123l.

  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 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 acquired from the E-DPCCH decoder unit 123k, information on HARQ, information on scheduling, etc. ) Is calculated and output.

  As shown in FIG. 8, the MAC-e function 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 sends the transmission format number input from the E-DPCCH decoder unit 123k, information about HARQ, information about scheduling, user data and CRC results input from the FEC decoder unit 123p, to the HARQ management unit 123l2. Configured to send.

  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 reception processing command unit 12311 is configured to manage the transmission data block size of user data in the mobile station UE connected to the radio base station NodeB.

  Also, the reception processing command unit 123l1 commands the buffer 123 based on the transmission data block size in each mobile station UE, and secures a buffer of a required size.

  The HARQ management unit 123l2 determines whether the user data reception process 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 the hardware resources to be prepared for the next TTI based on the received determination result to E- Notify the DPDCH RAKE unit 123d and the buffer 123m.

  Also, the reception processing command unit 123l1 notifies the HARQ management unit 123l2 for securing the resources of the HARQ buffer 123o.

  In addition, when there is user data stored in the buffer 123m for each transmission time interval (TTI) with respect to the buffer 123m and the FEC decoder unit 123p, the reception processing command unit 123l1 is 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 the TTI.

  In addition, the scheduling unit 123l3 can determine the absolute value or relative value (for example, Up / Down / of the maximum allowable transmission rate) based on the radio resources in the uplink of the radio base station NodeB, the interference amount (noise rise) in the uplink, and the like. The downlink configuration of the baseband signal processing unit 12 is instructed to notify a scheduling signal including (Hold).

  In addition, the scheduling unit 123l3 notifies the HARQ management unit 123l2 of the scheduling signal. The reception processing command unit 123l1 also notifies the HARQ management unit 123l2 of the transmission format number and the like decoded by the E-DPCCH decoder unit 123k in preparation for the user data reception processing in the next transmission time interval (TTI). .

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

  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 call admission control processing, channel setting and release processing by layer 3 signaling, and the like.

  The call control unit 56 determines a window width (time width), a transmission power increase width, a transmission power decrease width, and the like, which will be described later, according to the QoS and the degree of congestion in the uplink and downlink, and at a predetermined timing (for example, movement It is configured to notify the mobile station UE and the radio base station NodeB when a connection with the station UE is established.

(Operation of the mobile communication system according to the first embodiment of the present invention)
With reference to FIG.10 and FIG.11, the operation | movement which the mobile station UE transmits uplink user data with respect to the wireless base station NodeB in the mobile communication system which concerns on the 1st Embodiment of this invention is demonstrated.

  As shown in FIG. 10, in step S1001, the mobile station UE receives a relative rate control channel (RGCH) transmitted by a plurality of non-serving cells.

  Here, the relative rate control channel (RGCH) transmitted by a plurality of non-serving cells is a channel for instructing the change of the maximum allowable transmission rate of the uplink user data transmitted by the mobile station UE. Specifically, the relative speed control channel (RGCH) may include two values “Down / Don't care”.

In step S1002, the mobile station UE, as shown in FIGS. 11 (a) and 11 (b), receives a relative rate control channel (RGCH) received from a plurality of non-serving cells 1 and 2 in a predetermined time width (T ₁ ). Among these, the value (Down) assigned to the relative rate control channel (RGCH) for reducing the maximum allowable transmission rate of the uplink user data is accumulated.

Here, the mobile station UE acquires a time width (window width) T ₁ associated with the relative speed control channel (RGCH) transmitted from the non-serving cell when connecting the connection from the radio network controller RNC.

  In step S1003, the mobile station UE selects the largest accumulated value from the above accumulated values.

Specifically, as shown in FIGS. 11A and 11B, the mobile station UE receives a relative value (Down / Don't care) for each transmission time interval (TTI), stored in the sliding window having a (window width) T _1. Then, the mobile station UE integrates “Down / Don't care” stored in the sliding window to control the maximum allowable transmission rate of the uplink user data instructed from the non-serving cell (uplink user data Determining the degree of maximum allowable transmission rate reduction.

  For example, in the example of FIGS. 11A and 11B, when “Down” is “1 dB”, both from t = a [TTI] or t = a + 1 [TTI] from the non-serving cell 1 The degree of control of the maximum allowable transmission rate of uplink user data indicated by the relative rate control channel (RGCH) means a reduction of “2 dB”, and the uplink indicated by the relative rate control channel (RGCH) from the non-serving cell 2 The degree of control of the maximum allowable transmission rate of user data means a reduction of “1 dB”.

  Therefore, in the examples of FIGS. 11A and 11B, the mobile station UE uses the relative rate control channel (RGCH) from the non-serving cell 1 in both t = a [TTI] or t = a + 1 [TTI]. The cumulative value of the designated relative value (Down) is selected.

  Here, when the mobile station UE is connected to a plurality of non-serving cells, the mobile station UE includes a plurality of the above-described sliding windows.

  In step S1004, the mobile station UE determines the maximum allowable transmission rate of the uplink user data based on the selected cumulative value and the absolute value of the maximum allowable transmission rate included in the absolute rate control channel (AGCH).

  In the example of FIGS. 11A and 11B, the mobile station UE selects the non-serving cell 1 having a large number of times of receiving “Down” in both t = a [TTI] or t = a + 1 [TTI]. The maximum allowable transmission rate of the uplink user data notified by the absolute rate control channel (AGCH) from the serving cell is reduced by “2 dB” that is a cumulative value of “Down” from the non-serving cell 1.

  In step S1005, the mobile station UE increases the transmission rate of the uplink user data by a predetermined increase in transmission power until the determined maximum allowable transmission rate is reached.

(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, it is possible to improve the interference reduction effect, increase the radio channel capacity, and improve the radio quality.

1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention. FIG. 3 is a functional block diagram of a mobile station of the mobile communication system according to the first embodiment of the present invention. FIG. 3 is a functional block diagram of a baseband signal processing unit in the mobile station of the mobile communication system according to the first embodiment of the present invention. FIG. 3 is a functional block diagram of a MAC-e processing unit of a baseband signal processing unit in the mobile station of the mobile communication system according to the first embodiment of the present invention. FIG. 3 is a functional block diagram of a radio base station of the mobile communication system according to the first embodiment of the present invention. FIG. 3 is a functional block diagram of a baseband signal processing unit in the radio base station of the mobile communication system according to the first embodiment of the present invention. FIG. 3 is a functional block diagram of a MAC-e and a layer 1 processing unit (uplink configuration) in the baseband signal processing unit of the radio base station of the mobile communication system according to the first embodiment of the present invention. 4 is a functional block diagram of a MAC-e functional unit of a MAC-e and a layer 1 processing unit (uplink configuration) in the baseband signal processing unit of the radio base station of the mobile communication system according to the first embodiment of the present invention. FIG. . FIG. 3 is a functional block diagram of a radio network controller of the mobile communication system according to the first embodiment of the present invention. 3 is a flowchart showing an operation of the mobile communication system according to the first embodiment of the present invention. It is a figure which shows a mode that the transmission rate of user data is controlled in the mobile station of the mobile communication system 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 operation | movement at the time of transmitting bursty data in the conventional mobile communication system. It is a figure for demonstrating the operation | movement at the time of controlling the transmission rate in an uplink 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, 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 ... Radio network control station, 51 ... switching station interface, 52 ... LLC layer processing unit, 53 ... MAC layer processing unit, 54 ... media signal processing unit, 55 ... base station interface

Claims (2)

A transmission rate control method for controlling the transmission rate of uplink user data transmitted by a mobile station,
The serving cell of the mobile station transmits an absolute rate control channel including an absolute value of a maximum allowable transmission rate of the uplink user data to the mobile station;
A plurality of non-serving cells of the mobile station transmitting a relative rate control channel for instructing the mobile station to change the maximum allowable transmission rate of the uplink user data;
The mobile station accumulates a value assigned to a relative speed control channel for decreasing the maximum allowable transmission rate among the relative speed control channels received from the plurality of non-serving cells in a predetermined time width. Process,
The mobile station determines a maximum allowable transmission rate of the uplink user data based on the largest accumulated value and an absolute value included in the absolute rate control channel;
And a step of increasing the transmission rate of the uplink user data up to a maximum allowable transmission rate of the uplink user data by the mobile station. A mobile station that transmits uplink user data,
An absolute rate control channel receiving unit that receives an absolute rate control channel including an absolute value of a maximum allowable transmission rate of the uplink user data from a serving cell of the mobile station;
A relative rate control channel receiving unit that receives a relative rate control channel for instructing a change in the maximum allowable transmission rate of the uplink user data from a plurality of non-serving cells of the mobile station;
Accumulate values assigned to the relative speed control channel for reducing the maximum allowable transmission rate of the uplink user data among the relative speed control channels received from a plurality of non-serving cells of the mobile station in a predetermined time width. A cumulative part to
A maximum allowable transmission rate determination unit that determines a maximum allowable transmission rate of the uplink user data based on the largest accumulated value and an absolute value included in the absolute rate control channel;
A mobile station comprising: a transmission rate control unit that increases the transmission rate of the uplink user data up to a maximum allowable transmission rate of the uplink user data.

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