JP2006222703A - Transmission rate control method, mobile station and wireless base station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To materialize transmission rate control of uplink user data in accordance with a priority class established for each logic channel without increasing a reception processing load of a mobile station UE. <P>SOLUTION: A transmission rate control method disclosed herein includes: a step where a wireless base station sets a priority class to each logic channel; step where a wireless base station multiplexes priority class identification information for discriminating the priority class and a maximum permissible transmission rate of uplink user data in each priority class to produce an absolute rate grant channel, and transmits it to the mobile station; and a step where the mobile station extracts the priority class identification information for discriminating a specific priority class and the maximum permissible transmission rate from the received absolute rate grant channel to increase the transmission rate of the uplink user data to be transmitted via the logic channel of the specific priority class up to the extracted maximum permissible transmission rate. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a transmission rate control method, a mobile station, and a radio base station for controlling the transmission rate of uplink user data transmitted via a logical channel by a mobile station.

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

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

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

  However, as shown in FIG. 13, the radio network controller RNC normally controls a number of radio base stations NodeB in an integrated manner. Therefore, in a conventional mobile communication system, due to processing load, processing delay, and the like. 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. 14 (a), when performing bursty data transmission, as shown in FIG. 14 (b), low speed, high delay and low transmission efficiency are allowed. As shown in FIG. 14 (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. 14, 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 permissible transmission rate, the maximum permissible transmission rate at the timing itself or a relative value of the maximum permissible transmission rate (for example, the binary value of the Up command / Down command) ).

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

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

  “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 to be low so that the amount of uplink interference falls within the allowable value (see FIG. 15).

  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. 15).

Conventionally, there is a method for constructing and operating a flexible mobile communication system according to priority by providing a priority class (priority class) for a logical channel used when the mobile station UE transmits uplink user data. Are known.
3GPP TSG-RAN R1-040773

  However, in this method, when the common transmission rate control is adopted for each cell, the absolute value of the maximum allowable transmission rate of the uplink user data of different priority classes is different as shown in FIG. It is configured to be transmitted by separate absolute rate control channels (AGCH) that are code-division multiplexed by.

  Therefore, in such a method, a mobile station UE that simultaneously connects a plurality of logical channels belonging to different priority classes must receive and decode a plurality of absolute rate control channels (AGCH). There was a problem that the reception processing load increased.

  Therefore, the present invention has been made in view of the above points, and does not increase the reception processing load of the mobile station UE, and controls the transmission rate of uplink user data according to the priority class set for each logical channel. It is an object of the present invention to provide a transmission rate control method, a mobile station, and a radio base station that can realize the above.

  A first feature of the present invention is a transmission rate control method for controlling the transmission rate of uplink user data transmitted via a logical channel by a mobile station, wherein a radio base station assigns a priority to each logical channel. Setting an absolute rate control channel by multiplexing the priority class identification information for identifying the priority class and the maximum allowable transmission rate of the uplink user data in the priority class. Generating and transmitting to the mobile station, and extracting the priority class identification information identifying the specific priority class and the maximum allowable transmission rate from the absolute speed control channel received by the mobile station And increasing the transmission rate of the uplink user data transmitted via the logical channel of the specific priority class to the extracted maximum allowable transmission rate. And summarized in that and a by going process.

  According to a second aspect of the present invention, there is provided a mobile station that transmits uplink user data transmitted via a logical channel, the priority class identifying a priority class set for each logical channel from a radio base station. An absolute rate control channel receiving unit for receiving an absolute rate control channel in which the maximum allowable transmission rate of the uplink user data in the priority class is multiplexed, and a specific priority from the absolute rate control channel An extraction unit for extracting the priority class identification information for identifying a class and the maximum allowable transmission rate; and the transmission rate of the uplink user data to be transmitted via the logical channel of the specific priority class The gist of the present invention is to include a transmission rate control unit that increases to an allowable transmission rate.

  A third feature of the present invention is a radio base station used in a transmission rate control method for controlling a transmission rate of uplink user data transmitted via a logical channel by a mobile station, wherein priority is assigned to each logical channel. An absolute rate control channel is generated by multiplexing a priority class setting unit for setting a degree class, priority class identification information for identifying the priority class, and a maximum allowable transmission rate of the uplink user data in the priority class And an absolute rate control channel transmission unit for transmitting to the mobile station.

  As described above, according to the present invention, it is possible to realize the transmission rate control of uplink user data according to the priority class set for each logical channel without increasing the reception processing load of the mobile station UE. It is possible to provide a transmission rate control method, a mobile station, and a radio base station that can be used.

(Configuration of mobile communication system according to the first embodiment of the present invention)
The configuration of the mobile communication system according to the first embodiment of the present invention will be described with reference to FIG. 1 to FIG. 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 automatically increase the transmission rate of user data transmitted via the uplink by the mobile station UE to the maximum allowable transmission rate.

  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 composed of an enhanced dedicated physical data channel and an enhanced dedicated physical control channel, a dedicated physical data channel (DPDCH), and a dedicated physical control channel (DPCCH). Channel) is used as an individual physical channel.

  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.

  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 the maximum allowable transmission rate of user data in the mobile station UE (for example, the maximum allowable transmission data block size, the enhanced dedicated physical data channel (E-DPDCH) and the dedicated physical control channel (DPCCH)). This includes an absolute value of a maximum value of transmission power ratio (maximum allowable transmission power ratio, etc.), a parameter related to the maximum allowable transmission rate, a relative value for instructing to change the maximum allowable transmission rate, and the like.

  In this specification, unless otherwise specified, the maximum allowable transmission rate includes a parameter relating to the maximum allowable transmission rate.

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

  Here, the E-TFC selection unit 33c1 is transmitted via the logical channel belonging to each priority class until the maximum allowable transmission rate for each priority class notified from the radio base station NodeB by the schedule signal is reached. The transmission rate of user data in the uplink is increased.

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

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

  As illustrated in FIG. 4, the layer 1 processing unit 33d includes, as a downlink configuration, an HS-DPDCH RAKE unit 33d1, an RGCH RAKE unit 33d3, an AGCH RAKE unit 33d5, and FEC decoder units 33d3, 33d4, and 33d6. It has.

  The HS-DPDCH RAKE unit 33d1 performs despreading processing and RAKE combining processing on the high-speed dedicated physical data channel HS-DPDCH in the downlink signal transmitted from the RF unit 34, and outputs the result to the FEC decoder unit 33d2. It is configured.

  The FEC decoder unit 33d2 performs an FEC decoding process on the RAKE composite output of the HS-DPDCH RAKE unit 33d1, extracts an acknowledgment signal (Ack / Nack / DTX) and downlink user data for uplink user data, and extracts the MAC. -e It is comprised so that it may transmit to the process part 33c. Note that the FEC decoder unit 33d2 may be configured to apply soft combining when performing such FEC decoding processing.

  Further, the FEC decoder unit 33d3 is configured to transmit the CRC result applied to the downlink user data to the MAC-e processing unit 33c.

  The RGCH RAKE unit 33d3 performs despreading processing and RAKE combining processing on the relative rate control channel (RGCH) in the downlink signal transmitted from the RF unit 34, and outputs the result to the FEC decoder unit 33d4. Is configured to do.

  The FEC decoder unit 33d4 performs FEC decoding processing on the RAKE synthesis output of the RGCH RAKE unit 33d3, and performs scheduling signal (for example, relative value of the maximum allowable transmission rate (Down / Don't care or Up / Down / Hold)) is extracted and transmitted to the MAC-e processing unit 33c.

  The AGCH RAKE unit 33d5 is configured to perform despreading processing and RAKE combining processing on the absolute rate control channel (AGCH) in the downlink signal transmitted from the RF unit 34, and output the result to the FEC decoder unit 33d6. ing.

  Specifically, the AGCH RAKE unit 33d5, from the radio base station NodeB, priority class identification information for identifying the priority class set for each logical channel and the maximum permissible uplink user data of the priority class Priority class identification information and specification for receiving an absolute rate control channel (AGCH) in which an absolute value of a transmission rate is multiplexed and identifying a specific priority class from the received absolute rate control channel (AGCH) The maximum permissible transmission rate corresponding to the priority class is extracted.

  The FEC decoder unit 33d6 performs FEC decoding processing on the RAKE synthesis output of the AGCH RAKE unit 33d5, extracts a scheduling signal (for example, the absolute value of the maximum allowable transmission rate for each priority class), and performs MAC-e processing. It is comprised so that it may transmit to the part 33c.

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

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

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

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

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

  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, error correction decoding processing, HARQ processing, and the like on the baseband signal acquired from the transmission / reception unit 14.

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

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

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

  As shown in FIG. 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, a MAC-hs function unit 123q, and an interference power measurement unit 123r.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  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 method based on hardware resources, the scheduling unit 123l3 is configured to broadcast the maximum allowable transmission rate using an absolute rate allocation channel (AGCH) 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 the hardware resource becomes insufficient, the scheduling unit 123l3 sets the maximum allowable transmission rate to be low and We try to prevent shortages.

  On the other hand, the scheduling unit 123l3 sets the maximum allowable transmission rate to a high value again when there is a surplus in hardware resources, such as when user data transmission in a mobile station connected to a subordinate cell is completed.

  Also, in the control scheme based on the amount of interference in the uplink, the scheduling unit 123l3 notifies the mobile station UE connected to the subordinate cell of the maximum allowable transmission rate using an absolute rate assignment channel (AGCH). It is configured.

  The scheduling unit 123l3 increases the transmission rate of user data in the mobile station UE connected to the subordinate cell, and the amount of interference (eg, noise rise) in the uplink exceeds an allowable value (eg, maximum allowable noise rise). In such a case, the maximum allowable transmission rate is set low so that the amount of interference in the uplink falls within the allowable value (see FIG. 15).

  On the other hand, the scheduling unit 123l3 is configured such that the amount of interference (eg, noise rise) in the uplink is an allowable value (eg, maximum allowable noise rise) when user data transmission in the mobile station UE connected to the subordinate cell is completed If the margin is within the margin and there is a margin, the maximum allowable transmission rate is set again high (see FIG. 15).

  Further, the scheduling unit 123l3 is configured to set a priority class for each logical channel used when the mobile station UE transmits uplink user data. Then, the scheduling unit 123l3 determines the absolute value of the maximum allowable transmission rate of the uplink user data for each priority class, and identifies the absolute value of the maximum allowable transmission rate and the priority class for each priority class. A scheduling signal including the priority class ID is transmitted to the downlink configuration of the baseband signal processing unit 12.

  As shown in FIG. 9, the MAC-e and layer 1 processing unit (downlink configuration) 123 includes FEC encoding units 1231 and 1233 and spreading units 1232 and 1234.

  The FEC encoding unit 1231 performs an FEC encoding process on the acknowledgment signal (Ack / Nack) for uplink user data and the downlink user data transmitted from the MAC-e function unit 123l, and transmits to the spreading unit 1232 It is configured to.

  The spreading unit 1232 is configured to perform spreading processing on the output result from the FEC encoding unit 1231 and transmit the result to the RF unit 34 as a high-speed dedicated physical data channel (HS-DPDCH).

  The FEC encoding unit 1233 is configured to perform an FEC encoding process on the scheduling signal transmitted from the MAC-e function unit 123l and transmit it to the spreading unit 1234.

  The spreading unit 1234 is configured to perform spreading processing on the output result from the FEC encoding unit 1233 and transmit the result to the RF unit 34 as an absolute rate control channel (AGCH).

  Specifically, the spreading unit 1234 uses the single channelization code to control the priority class identification information for identifying each priority class and the maximum allowable transmission rate for each priority class. It is configured to be multiplexed with a channel (AGCH) and transmitted to the mobile station UE.

  The spreading unit 1234 is configured to perform spreading processing on the output result from the FEC encoding unit 1233 and transmit the result to the RF unit 34 as a relative rate control channel (RGCH).

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

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

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

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

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

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

  The call control unit 56 is configured to perform radio resource management processing, channel setting and release processing by layer 3 signaling, and the like. Here, the radio resource management includes call admission control, handover control, and the like.

(Operation of the mobile communication system according to the first embodiment of the present invention)
With reference to FIG.11 and FIG.12, operation | movement of the mobile communication system which concerns on the 1st Embodiment of this invention is demonstrated.

  As shown in FIG. 11, in step S1001, the radio base station NodeB sets a priority class for each logical channel used for transmission of uplink user data by the mobile station UE, and uplink user data for each priority class. Determine the absolute value of the maximum allowable transmission rate. Then, the radio base station NodeB uses priority class identification information for identifying each priority class and the maximum allowable transmission rate for each priority class, using one channelization code, and one absolute rate control channel (AGCH). To multiplex.

  FIG. 12 shows an example of the absolute rate control channel (AGCH). As shown in FIG. 12, the absolute rate control channel (AGCH) is multiplexed with the absolute value of the maximum allowable transmission rate of uplink user data and priority class identification information for identifying the priority class.

  In step S1002, the radio base station NodeB transmits the above-described absolute rate control channel (AGCH) to the mobile station UE.

  In step S1003, the mobile station UE extracts an absolute rate control channel (AGCH) corresponding to a specific priority class (for example, classes 1 and 2) from the received absolute rate control channel (AGCH). Specifically, the mobile station UE performs reception processing on the received absolute rate control channel (AGCH) using one channelization code, thereby allowing a maximum allowable transmission rate corresponding to a plurality of priority classes. Is configured to extract.

  In step S1004, the uplink user data included in the absolute rate control channel (AGCH) of the specific priority class is set as the transmission rate of the uplink user data transmitted by the mobile station UE via the logical channel of the specific priority class. Will increase to the maximum permissible transmission rate.

(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 realize the transmission rate control of uplink user data according to the priority class for each logical channel using a simple transmission rate controller. Therefore, it becomes possible to operate and construct a mobile communication system with higher flexibility.

  Also, according to the mobile communication system according to the first embodiment of the present invention, when receiving the maximum allowable transmission rate corresponding to a plurality of priority classes, a plurality of absolute rate control channels using a plurality of channelization codes. (AGCH) does not need to be subjected to reception processing, and it is only necessary to perform reception processing for a plurality of absolute rate control channels (AGCH) using one channelization code. Can be reduced.

It is a functional block diagram of the mobile station of the mobile communication system which concerns on one Embodiment of this invention. It is a functional block diagram of the baseband signal processing part in the mobile station of the mobile communication system which concerns on one Embodiment of this invention. It is a functional block diagram of the MAC-e processing unit of the baseband signal processing unit in the mobile station of the mobile communication system according to one embodiment of the present invention. It is a functional block diagram of the layer 1 processing unit of the baseband signal processing unit in the mobile station of the mobile communication system according to one embodiment of the present invention. It is a functional block diagram of the radio base station of the mobile communication system which concerns on one Embodiment of this invention. FIG. 3 is a functional block diagram of a baseband signal processing unit in a radio base station of a mobile communication system according to an embodiment of the present invention. FIG. 4 is a functional block diagram of a MAC-e and a layer 1 processing unit (uplink configuration) in a baseband signal processing unit of a radio base station of a mobile communication system according to an embodiment of the present invention. It is a functional block diagram of MAC-e function part of MAC-e in a baseband signal processing part of the radio base station of the mobile communication system which concerns on one Embodiment of this invention, and a layer 1 process part (configuration for uplink). FIG. 4 is a functional block diagram of a MAC-e and a layer 1 processing unit (downlink configuration) in a baseband signal processing unit of a radio base station of a mobile communication system according to an embodiment of the present invention. It is a functional block diagram of the radio network controller of the mobile communication system according to an embodiment of the present invention. It is a sequence diagram which shows operation | movement of the mobile communication system which concerns on one Embodiment of this invention. It is a figure which shows an example of the absolute rate control channel transmitted by the radio base station of the mobile communication system which concerns on one Embodiment of this invention. 1 is an overall configuration diagram of a general mobile communication system. It is a figure for demonstrating the operation | movement at the time of transmitting bursty data in the conventional mobile communication system. 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. It is a figure which shows an example of the absolute rate control channel transmitted by the radio base station of 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, 33d2, 33d4, 33d6, FEC decoder unit, 123k, E-DPCCH decoder unit, 123l, MAC-e function unit, 123l1 ... Reception processing command part, 123l2 ... ARQ management unit, 123l3 ... scheduling unit, 123o ... HAQR buffer, 123q ... MAC-hs functional unit, 1231, 1233 ... FEC encoding unit, 1232, 1234 ... spreading unit, 13, 56 ... call control unit, 14 ... transmission / reception unit 15 ... Amplifier unit 16, 35 ... Transmit / receive 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, 33d1 ... HS-DPDCH RAKE unit, 33d3 ... RGCH RAKE unit, 33d5 ... AGCH RAKE unit, RNC ... radio network controller, 51 ... switching center interface, 52 ... LLC layer Processing unit, 53... MAC layer processing unit, 54... Media signal processing unit, 55. Station interface

Claims (3)

A transmission rate control method for controlling a transmission rate of uplink user data transmitted via a logical channel by a mobile station,
A radio base station setting a priority class for each logical channel;
The radio base station generates an absolute rate control channel by multiplexing the priority class identification information for identifying the priority class and the maximum allowable transmission rate of the uplink user data in the priority class, and transmits the absolute rate control channel to the mobile station. A process of transmitting to the
The mobile station extracts the priority class identification information for identifying a specific priority class and the maximum allowable transmission rate from the received absolute speed control channel, and passes through the logical channel of the specific priority class. And increasing the transmission rate of the uplink user data to be transmitted up to the extracted maximum allowable transmission rate. A mobile station that transmits uplink user data transmitted via a logical channel,
An absolute rate control channel in which priority class identification information for identifying a priority class set for each logical channel and a maximum allowable transmission rate of the uplink user data in the priority class are multiplexed from a radio base station. An absolute speed control channel receiver to receive,
An extraction unit for extracting the priority class identification information for identifying a specific priority class and the maximum allowable transmission rate from the absolute rate control channel;
A mobile station comprising: a transmission rate control unit that increases the transmission rate of the uplink user data transmitted through the logical channel of the specific priority class to the extracted maximum allowable transmission rate; . A radio base station used in a transmission rate control method for controlling the transmission rate of uplink user data transmitted via a logical channel by a mobile station,
A priority class setting unit for setting a priority class for each logical channel;
The absolute rate at which an absolute rate control channel is generated by multiplexing the priority class identification information for identifying the priority class and the maximum allowable transmission rate of the uplink user data in the priority class and transmitted to the mobile station A radio base station comprising a control channel transmission unit.

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