JP2006345501A - Transmission rate control method and mobile station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmission rate control method which can transmit uplink user data at any TTI when a transmission power offset is indicated by a common AG in a system where mobile station performs a transmission using different TTI. <P>SOLUTION: The transmission rate control method includes the steps of : transmitting, at a wireless base station, a transmission power offset to a DPCCH of an E-DPDCH using a common AG to a mobil station; determining, at the mobile station, the transmission rate which corresponds to the received transmission power offset; and transmitting, at the mobile station, the uplink user data at a transmission rate which is less than or equal to the determined transmission rate by decreasing the number of HARQ processes to be used when the determined transmission rate is below a transmission rate in the case that the uplink user data are transmitted using a minimum TBS at every HARQ process. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a transmission rate control method and a mobile station.

  In uplink enhancement (EUL), a common absolute transmission rate control signal (common AG: Common Absolute Grant) in which all mobile stations located in a cell receive with the same ID (common ID), and each mobile station There is a transmission rate control method capable of performing both common transmission rate control and individual transmission rate control using two AGs of individual absolute transmission rate control signals (individual AG: Dedicated Absolute Grant) that receive signals with different IDs. It has been proposed (for example, Non-Patent Document 1).

  The AG is transmitted from the radio base station to the mobile station via an absolute transmission rate control channel (E-AGCH: E-DCH AG Channel), and the common AG and the dedicated AG may be mapped to different E-AGCHs, It may be mapped to the same E-AGCH.

  On the other hand, as described in Non-Patent Document 2, the E-DCH transmission time width (hereinafter referred to as TTI: Transmission Time Interval) can be selected from 2 ms and 10 ms.

  By setting 2 ms, finer scheduling becomes possible, while by setting 10 ms, the downlink transmission power can be reduced and the impact on the downlink capacity can be reduced.

  That is, when the TTI of E-DCH is 2 ms, the frame length of the layer 1 channel (E-AGCH / E-RGCH / E-HICH) in the downlink related to EUL is 2 ms, and the TTI of E-DCH Is 10 ms, the frame length of E-AGCH related to EUL is 10 ms, and the frame length of E-RGCH / E-HICH related to EUL is 8 ms.

  Accordingly, when the T-TI of E-DCH is 10 ms, the frequency of transmitting the above-described downlink layer 1 channel is reduced, and the impact on downlink capacity is reduced.

  As described in Non-Patent Document 2, the transmission rate control is performed when the radio base station transmits a transmission power offset (E-DPDCH transmission power / DPCCH transmission power, that is, transmission power offset for the dedicated physical control channel of the enhanced dedicated physical data channel). The mobile station determines a TBS for transmitting uplink user data based on a correspondence table between a transmission power offset indicated by the received AG and a transmission data block size (TBS: Transport Block Size). May be used.

  In this case, when E-DCH having a different TTI is controlled using a common AG, the following problems may occur.

  Here, the E-DCH TTI takes 10 ms and 2 ms, the minimum TBS is 200 bits, and a transmission power offset corresponding to 60 kbps is notified as a schedule signal via the common AG. Consider an example.

At this time, when the TTI of E-DCH is 10 ms, the mobile station can transmit uplink user data of 600 bits (= 60 kbps × 10 ms) in each TTI (each HARQ process). When the TTI of the mobile station is 2 ms, the amount of data that can be transmitted in each TTI (each HARQ process) does not reach the minimum TBS (200 bits) at 120 bits (= 60 kbps × 2 ms). Uplink user data cannot be transmitted in each HARQ process.
3GPP TSG-RAN R2-050929 3GPP TSG-RAN TS.309 v6.2.0

  As described above, in a system in which mobile stations perform transmission using different TTIs, when a transmission power offset is specified by a common AG, the mobile station transmits uplink user data in the larger TTI. However, with the shorter TTI, there is a case where the amount of data that can be transmitted cannot reach the minimum TBS and the uplink user data cannot be transmitted.

  Therefore, the present invention has been made in view of the above points. In a system in which a mobile station performs transmission using different TTIs, when a transmission power offset is designated by a common AG, in which TTI Another object of the present invention is to provide a transmission rate control method and a mobile station capable of transmitting uplink user data.

  A first feature of the present invention is a transmission rate control method for controlling a transmission rate of uplink user data from a mobile station located in a predetermined cell to a radio base station, wherein the radio base station controls the mobile station. Using the common absolute transmission rate control signal transmitted via the absolute transmission rate control channel, notifying the transmission power offset of the enhanced individual physical data channel with respect to the individual physical control channel, and the mobile station received the Determining the transmission rate corresponding to a transmission power offset, and the determined transmission rate being lower than a transmission rate when the uplink user data is transmitted with a minimum transmission data block size in all HARQ processes; The mobile station transmits the uplink user data by reducing the number of HARQ processes to be used. And summarized in that a step of transmitting the determined said transmission said uplink user data at a rate less than or equal to.

  In the first aspect of the present invention, the reduced transmission power offset of the HARQ process is added to the transmission power offset of the remaining HARQ process to obtain a transmission power offset corresponding to the minimum transmission data block size. Until then, the uplink user data may be transmitted below the determined transmission rate by reducing the number of HARQ processes to be used and transmitting the uplink user data.

  A second feature of the present invention is a mobile station that controls the transmission rate of uplink user data, via an absolute transmission rate control channel transmitted from a radio base station to a mobile station located in a predetermined cell. A receiving unit that receives a common absolute transmission rate control signal including information on a transmission power offset of the enhanced dedicated physical data channel with respect to the dedicated physical control channel, and a determination unit that determines the transmission rate corresponding to the received transmission power offset When the determined transmission rate is lower than the transmission rate when the uplink user data is transmitted with the minimum transmission data block size in all HARQ processes, the number of HARQ processes to be used is reduced By transmitting user data, the uplink user data is transmitted below the determined transmission rate. And summarized in that it includes a signal portion.

  In the second aspect of the present invention, the transmission unit adds the reduced transmission power offset of the HARQ process to the remaining transmission power offset of the HARQ process to correspond to the minimum transmission data block size. The uplink user data may be transmitted below the determined transmission rate by reducing the number of HARQ processes to be used and transmitting the uplink user data until a transmission power offset is reached. .

  A third feature of the present invention is a transmission rate control method for controlling a transmission rate of uplink user data from a mobile station located in a predetermined cell to a radio base station, wherein the radio base station Using the common absolute transmission rate control signal transmitted via the absolute transmission rate control channel, notifying the transmission power offset of the enhanced individual physical data channel with respect to the individual physical control channel; and A transmission data block size corresponding to the received transmission power offset and a HARQ process corresponding to the received transmission power offset using a correspondence table in which the transmission data block size and the number of HARQ processes are associated with each other Determining a number, and the mobile station determines a HAR of the determined number of HARQ processes And transmitting the uplink user data with the determined transmission data block size using a process, and in the correspondence table, the minimum transmission data block size is associated with a plurality of HARQ process numbers. It is a summary.

  A fourth feature of the present invention is a mobile station that controls the transmission rate of uplink user data, via an absolute transmission rate control channel transmitted from a radio base station to a mobile station located in a predetermined cell. A reception unit that receives a common absolute transmission rate control signal including information on a transmission power offset of the enhanced dedicated physical data channel with respect to the dedicated physical control channel, a transmission power offset, a transmission data block size, and a number of HARQ processes And determining a transmission data block size corresponding to the received transmission power offset using a correspondence table, and determining a number of HARQ processes corresponding to the received transmission power offset, and the determined HARQ process The transmission data block size determined using a number of HARQ processes And a transmission unit configured to transmit the uplink user data, in the correspondence table, the minimum of the transmission data block size, and summarized in that associated with the number of the plurality of HARQ processes.

  As described above, according to the present invention, when a transmission power offset is designated by a common AG in a system in which a mobile station performs transmission using different TTIs, the uplink user data in both TTIs Can be transmitted, and a mobile station can be provided.

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

  The mobile communication system according to the present embodiment is configured to control the transmission rate of uplink user data from a mobile station located in a predetermined cell to a radio base station.

  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 “HSDPA” and “EUL”, retransmission control by HARQ (N process stop and wait) is performed.

  Therefore, in the uplink, an enhanced dedicated physical channel (E-DPCH) composed of an enhanced dedicated physical data channel (E-DPDCH) and an enhanced dedicated physical control channel (E-DPCCH), and a dedicated physical data channel (DPDCH: Dedicated) A dedicated physical channel (DPCH) composed of a physical data channel (DPCCH) and a dedicated physical control channel (DPCCH) is used.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  The E-TFC selection unit 33c1 is configured to transmit an enhanced dedicated physical data channel (E-DPDCH) based on a scheduling signal (AG and a relative speed control signal (RG: Relative Grant), etc.) transmitted from the radio base station NodeB. It is configured to determine (E-TFC).

  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 format information is transmitted to the HARQ processing unit 33c2.

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

  Also, the transmission power offset for the dedicated physical control channel of the enhanced dedicated physical data channel via the E-AGCH (absolute transmission rate control channel) transmitted from the radio base station NodeB to the mobile station located in the predetermined cell Is received, the E-TFC selector 33c1 is configured to determine a transmission rate corresponding to the received transmission power offset.

  Further, the E-TFC selection unit 33c1 uses the HARQ to be used when the determined transmission rate is lower than the transmission rate when uplink user data is transmitted with the minimum transmission data block size in all HARQ processes. By determining the number of processes to be transmitted and transmitting the uplink user data, it is determined to transmit the uplink user data at or below the determined transmission rate.

  The E-TFC selection unit 33c1 adds the reduced transmission power offset of the HARQ process to the transmission power offset of the remaining HARQ process until the transmission power offset corresponding to the minimum transmission data block size is reached. It may be determined to transmit the uplink user data at a transmission speed lower than the determined transmission rate by reducing the number of HARQ processes to be transmitted and transmitting the uplink user data.

  The HARQ processing unit 33c2 performs “N process stop-and-wait” process management. In each HARQ process, a delivery confirmation signal (Ack / Nack for uplink data) and E-TFC selection received from the radio base station NodeB Based on the transmission format information determined by the unit 33c1, uplink user data (uplink user data) is transmitted.

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

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

  The HWY interface 11 is configured to receive control data for the radio base station NodeB from the radio network controller RNC and input it to the call controller 13.

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

  Further, the HWY interface 11 is configured to acquire control data for the radio network controller RNC from the call controller 13 and transmit it to the radio network controller RNC.

  The baseband signal processing unit 12 is configured to perform a MAC-e process or 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. Yes.

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

  The baseband signal processing unit 12 is configured to perform layer 1 processing or MAC-e processing on the baseband signal acquired from the transmission / reception unit 14 to extract user data and transfer the user data to the HWY interface 11. Has been.

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

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

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

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

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

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

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

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

  As shown in FIG. 6, the MAC-e and layer 1 processing unit (uplink configuration) 123 includes a DPCCH RAKE unit 123a, a DPDCH RAKE unit 123b, an E-DPCCH RAKE unit 123c, and an E-DPDCH RAKE unit 123d. HS-DPCCH RAKE unit 123e, RACH processing unit 123f, TFCI decoder unit 123g, buffers 123h and 123m, re-despreading units 123i and 123n, FEC decoder units 123j and 123p, and E-DPCCH decoder unit 123k, a MAC-e function unit 123l, a HARQ buffer 123o, 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, acquires a transmission format number, information on HARQ, information on scheduling, and the like to the MAC-e function unit 123l. Configured to input.

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

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

  Based on the transmission format information (spreading rate) transmitted from the MAC-e function unit 123l, the re-despreading unit 123n performs inverse processing on the RAKE composite 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, HARQ information, scheduling information, etc. acquired from the E-DPCCH decoder unit 123k. Etc.) is calculated and output.

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

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

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

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

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

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

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

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

  The scheduling unit 123l3 is configured to transmit a scheduling signal (AG, RG, etc.) via the downlink configuration.

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

  As shown in FIG. 8, the radio network controller RNC according to the present embodiment includes an exchange interface 51, an RLC layer processing unit 52, a MAC layer processing unit 53, a media signal processing unit 54, and a radio 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 RLC layer processing unit 52 and transfer the uplink signal transmitted from the RLC layer processing unit 52 to the switching center 1. Yes.

  The RLC layer processing unit 52 is configured to perform RLC (Radio Link Control) sublayer processing such as header processing such as sequence numbers or trailer combining processing. The RLC layer processing unit 52 is configured to transmit the uplink signal to the exchange interface 51 and transmit the downlink signal to the MAC layer processing unit 53 after performing the RLC sublayer processing.

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

  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 radio base station interface 55 after performing the media signal processing.

  The radio base station interface 55 is an interface with the radio base station NodeB. The radio 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). ) Is transmitted to the radio base station NodeB.

  The call control unit 56 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.

  FIG. 9 shows the relationship between the transmission power offset and the transmission rate in this embodiment. FIG. 10 is a flowchart showing an example of a method for determining the number of HARQ processes of the mobile station UE in the present embodiment.

  In step S101, the mobile station UE receives the transmission power offset by the common AG, and in step S102, determines the transmission rate (Rate) corresponding to the received transmission power offset using the correspondence table shown in FIG.

  Next, in step S103 and step S104, the mobile station UE determines whether “(transmission rate) × (used TTI)” is smaller than the minimum transmission data block size (TBS).

  That is, in step S103 and step S104, the mobile station UE determines whether the transmission rate (Rate) determined in step S102 is lower than the transmission rate when uplink user data is transmitted with the minimum TBS in all HARQ processes. Determine whether or not.

  If it is smaller, the mobile station UE reduces the number of HARQ processes to be used one by one from the maximum value N of the HARQ process (step S106), and each time “(transmission rate) × (used” TTI) × n / N ”is calculated and compared with the minimum TBS (step S104).

  When the calculated value is equal to or larger than the minimum TBS, this operation ends, and the mobile station UE transmits uplink user data using the number of HARQ processes n at this time.

  According to the present embodiment, when the transmission rate corresponding to the transmission power offset notified by the common AG is lower than the transmission rate when uplink user data is transmitted with the minimum TBS in all HARQ processes, the mobile station UE By using a limited number of HARQ processes for transmission without using all HARQ processes, communication can be performed without any problem even in different TTIs.

  For example, assuming that the transmission power offset corresponding to 60 kbps is notified by the common AG, when the TTI of the E-DCH is 2 ms, the minimum TBS (200 bits) as the TBS used for transmitting the uplink user data in each TTI However, since the transmission rate of the uplink user data is 100 kbps and exceeds the notified transmission rate, the uplink user data cannot be transmitted.

  Therefore, for example, even in such a case, if the number of HARQ processes used for transmission of uplink user data is limited to three among the five HARQ processes, 200 bits of uplink user data can be seen in a section of 10 ms. 3TTI for transmitting the data and 2TTI for not transmitting the uplink user data, the average transmission rate is 60 kbps.

  Furthermore, when limiting the number of HARQ processes to use, the reduced HARQ process transmit power offset is added to the remaining HARQ process transmit power offset until the transmit power offset corresponding to the minimum TBS is reached. By reducing the number of HARQ processes and transmitting the uplink user data using only the number of remaining processes, the uplink user can be transmitted without reducing the transmission rate below the transmission rate notified by the common AG by using as many HARQ processes as possible. It is possible to transmit data and disperse the interference given to other users over time.

(Modification 1)
With reference to FIG.11 and FIG.12, the mobile communication system which concerns on the modification 1 of this invention is demonstrated. Hereinafter, differences from the mobile communication system according to the first embodiment will be mainly described.

  The E-TFC selection unit 33c1 of the mobile station UE uses the correspondence table in which the transmission power offset, the transmission data block size, and the number of HARQ processes illustrated in FIG. 11 are associated with each other from the radio base station NodeB via the common AG. The transmission data block size corresponding to the received transmission power offset is determined, and the number of HARQ processes corresponding to the transmission power offset is determined.

  The E-TFC selection unit 33c1 of the mobile station UE determines to transmit the uplink user data with the determined transmission data block size by using the HARQ processes for the determined number of HARQ processes.

  In the correspondence table shown in FIG. 11, a plurality of HARQ processes (1 to 5) are associated with the minimum transmission data block size (200 bits). Here, in this modified example, it is assumed that the maximum number of usable HARQ processes is “5”.

  As shown in FIG. 12, the common base station (Node B) transmits a common AG (common absolute transmission rate) to a plurality of mobile stations UE located in a predetermined cell via an E-AGCH (absolute transmission rate control channel). When the transmission power offset of the enhanced dedicated physical data channel with respect to the dedicated physical control channel is transmitted using the control signal), in step S201, the mobile station UE receives the transmission power offset PO.

  In step S202, the mobile station UE uses the correspondence table (see FIG. 11) in which the transmission power offset, the transmission data block size, and the number of HARQ processes are associated, and the transmission data block size corresponding to the received transmission power offset. (TBS) is determined, and the number of HARQ processes corresponding to the received transmission power offset is determined.

  In step S203, the mobile station UE transmits uplink user data with the determined transmission data block size using the HARQ processes for the determined number of HARQ processes.

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. It is a figure which shows the conversion table which matches the transmission power offset and transmission rate in the 1st Embodiment of this invention. 3 is a flowchart for explaining the operation of the mobile communication system according to the first embodiment of the present invention. It is a figure which shows the conversion table which matches the transmission power offset in the example 1 of this invention, transmission data block size, and the number of HARQ processes. It is a flowchart explaining operation | movement of the mobile communication system which concerns on the modification 1 of this invention. 1 is an overall configuration diagram of a general mobile communication system. It is a figure for demonstrating the operation | movement at the time of transmitting bursty data in the conventional mobile communication system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Switching station NodeB ... Wireless base station 11 ... HWY interface 12, 33 ... Baseband signal processing part 123 ... MAC-e and layer 1 processing part 123a ... DPCCH RAKE part 123b ... DPDCH RAKE part 123c ... E-DPCCH RAKE part 123d ... E-DPDCH RAKE unit 123e ... HS-DPCCH RAKE unit 123f ... RACH processing unit 123g ... TFCI decoder unit 123h, 123m ... Buffers 123i, 123n ... Re-despreading unit 123j, 123p ... FEC decoder unit 123k ... E-DPCCH decoder unit 123l ... MAC-e function part 123l1 ... reception processing command part 123l2 ... HARQ management part 123l3 ... scheduling part 123o ... HARQ buffer 123q ... MAC-hs function part 13, 56 ... call control part 14 ... transmission / reception part 1 ... Amplifiers 16, 35 ... Transceiver antenna UE ... Mobile station 31 ... Bus interface 32 ... Call processor 33a ... RLC processor 33b ... MAC-d processor 33c ... MAC-e processor 33c1 ... E-TFCI selector 33c2 ... HARQ processing unit 33d ... layer 1 processing unit 34 ... RF unit RNC ... radio network controller 51 ... switching center interface 52 ... RLC layer processing unit 53 ... MAC layer processing unit 54 ... media signal processing unit 55 ... radio base station interface

Claims (6)

A transmission rate control method for controlling the transmission rate of uplink user data from a mobile station located in a predetermined cell to a radio base station,
The radio base station notifies the mobile station of the transmission power offset of the enhanced dedicated physical data channel with respect to the dedicated physical control channel using a common absolute transmission rate control signal transmitted via the absolute transmission rate control channel. Process,
The mobile station determining the transmission rate corresponding to the received transmission power offset;
When the determined transmission rate is lower than the transmission rate when the uplink user data is transmitted with the minimum transmission data block size in all HARQ processes, the mobile station reduces the number of HARQ processes used. A transmission rate control method comprising: transmitting the uplink user data at a rate equal to or lower than the determined transmission rate by transmitting the uplink user data.   The number of HARQ processes to use until the transmission power offset corresponding to the minimum transmission data block size is obtained by adding the reduced transmission power offset of the HARQ process to the transmission power offset of the remaining HARQ process. The transmission rate control method according to claim 1, wherein the uplink user data is transmitted at a rate equal to or less than the determined transmission rate by reducing the transmission rate and transmitting the uplink user data. A mobile station that controls the transmission rate of uplink user data,
Common absolute transmission rate including information on transmission power offset for the dedicated physical control channel of the enhanced dedicated physical data channel via the absolute transmission rate control channel transmitted from the radio base station to the mobile station located in the predetermined cell A receiver for receiving the control signal;
A determination unit for determining the transmission rate corresponding to the received transmission power offset;
When the determined transmission rate is lower than the transmission rate when the uplink user data is transmitted with the minimum transmission data block size in all HARQ processes, the number of HARQ processes to be used is reduced and the uplink user data is reduced. And a transmission unit for transmitting the uplink user data at a transmission speed lower than the determined transmission rate.   The transmission unit adds the reduced transmission power offset of the HARQ process to the transmission power offset of the remaining HARQ process until the transmission power offset corresponding to the minimum transmission data block size is reached. 4. The apparatus according to claim 3, wherein the uplink user data is transmitted at a transmission speed lower than the determined transmission rate by reducing the number of HARQ processes to be transmitted and transmitting the uplink user data. 5. Mobile station. A transmission rate control method for controlling the transmission rate of uplink user data from a mobile station located in a predetermined cell to a radio base station,
The radio base station notifies the mobile station of the transmission power offset of the enhanced dedicated physical data channel with respect to the dedicated physical control channel using a common absolute transmission rate control signal transmitted via the absolute transmission rate control channel. Process,
The mobile station determines a transmission data block size corresponding to the received transmission power offset using a correspondence table associating a transmission power offset, a transmission data block size, and the number of HARQ processes, and the received Determining the number of HARQ processes corresponding to the transmit power offset;
The mobile station transmitting the uplink user data with the determined transmission data block size using HARQ processes of the determined number of HARQ processes,
In the correspondence table, the minimum transmission data block size is associated with a plurality of HARQ process numbers. A mobile station that controls the transmission rate of uplink user data,
Common absolute transmission rate including information on transmission power offset for the dedicated physical control channel of the enhanced dedicated physical data channel via the absolute transmission rate control channel transmitted from the radio base station to the mobile station located in the predetermined cell A receiver for receiving the control signal;
A correspondence table in which a transmission power offset, a transmission data block size, and the number of HARQ processes are associated is used to determine a transmission data block size corresponding to the received transmission power offset, and to correspond to the received transmission power offset A determination unit that determines the number of HARQ processes to be performed;
A transmission unit that transmits the uplink user data with the determined transmission data block size using HARQ processes of the determined number of HARQ processes;
In the correspondence table, the minimum transmission data block size is associated with a plurality of HARQ process numbers.

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