JP2006222898A - Transmission rate control method and mobile station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method whereby a mobile station performing soft handover increases a transmission rate of uplink user data. <P>SOLUTION: A transmission rate control method is disclosed herein, whereby the mobile station increases the transmission rate of the uplink user data up to a maximum permissible transmission rate. The transmission rate control method includes: a step where the mobile station receives an acknowledgement signal with respect to the uplink user data from a serving cell; and a step where the mobile station increases the transmission rate of the uplink user data to be transmitted at a prescribed point of time on the basis of a transmission data block size of the uplink user data the acknowledgement signal of which the mobile station receives. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a transmission rate control method and a mobile station in which a mobile station increases the transmission rate of uplink user data to a maximum allowable transmission rate.

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

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

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

  Therefore, in the conventional mobile communication system, as shown in FIG. 15 (a), when performing bursty data transmission, as shown in FIG. 15 (b), low speed, high delay and low transmission efficiency are allowed. As shown in FIG. 15 (c), radio resources for high-speed communication are secured and radio resources in idle time and hardware resources in the radio base station NodeB are wasted. Data is transmitted with permission.

  However, in FIG. 15, it is assumed that both the above-described radio band resource and hardware resource are applied to the 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 uplink user data and a transmission rate of user data at every predetermined timing, and transmits the uplink user data together with the mobile station ID. Information related to the speed (or the maximum allowable transmission speed of the uplink user data) is broadcast.

  Then, the mobile station UE designated by the radio base station NodeB transmits uplink user data at the designated timing and transmission rate (or within 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 uplink user data if there is uplink user data to be transmitted to the radio base station NodeB, but regarding the maximum allowable transmission rate of the uplink user data, For each transmission frame or for each of a plurality of transmission frames, one determined by the radio base station NodeB and notified to each mobile station UE is used.

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

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

  In this radio resource control method, the radio base station NodeB broadcasts the transmission rate of uplink 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 the uplink 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 the uplink 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, “Rate Control per Cell” is used for the radio base station NodeB to broadcast information common to cells, and each mobile station UE autonomously determines the transmission rate of uplink 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 the uplink user data regardless of whether it transmits uplink user data, the radio base station NodeB must There was a problem that the device scale of the station NodeB increased.

  Therefore, for example, as shown in Non-Patent Document 1, the mobile station UE increases the transmission rate of the uplink user data from the initial transmission rate notified in advance according to a predetermined rule, whereby the radio base station NodeB There is proposed a method (Autonomous ramping method) that prevents excessive radio capacity allocation by, and as a result, prevents an increase in the device scale of the radio base station NodeB.

  As shown in Non-Patent Document 1, the following two methods have been proposed for increasing the transmission rate of uplink user data in the Autonomous ramping method.

  As a first method, the uplink transmission time interval (TTI: Transmission Time Interval) is increased by increasing the transmission block size regardless of whether or not the mobile station UE receives a positive acknowledgment signal (Ack). A method for increasing the transmission rate of user data has been proposed.

  As a second method, when the mobile station UE receives a positive acknowledgment signal (Ack), by increasing the transmission data block size of the uplink user data for the positive acknowledgment signal (Ack), A method for increasing the transmission rate of uplink user data has been proposed.

  If the first method is used, the transmission rate of the uplink user can be quickly increased. On the other hand, without knowing that the radio base station NodeB has received the uplink user data, the mobile station UE There is a possibility of increasing the data transmission rate. In this case, the radio base station NodeB may not be able to receive uplink user data because it cannot prepare appropriate processing resources. .

  Therefore, Non-Patent Document 2 considers that the second method is an effective method, and only when the mobile station UE receives a positive acknowledgment signal (Ack), the transmission rate of the uplink user data is increased. Propose to increase.

  On the other hand, the mobile station UE can obtain a selective combined gain by performing soft handover with a different radio base station NodeB. Therefore, as shown in Non-Patent Document 3, soft handover is applied even in uplink enhancement.

  One serving cell is allocated to the mobile station UE performing soft handover from the connection destination cell. A serving cell is a cell that supervises scheduling of the mobile station UE.

  In the transmission rate control common to the cells, the serving cell uses the absolute rate control channel (AGCH) to set a maximum allowable transmission rate (or a parameter relating to the maximum allowable transmission rate, such as a transmission power ratio). And the subordinate mobile station UE is notified.

  In addition, a cell other than the serving cell (non-serving cell) may suppress the maximum allowable transmission rate notified by the serving cell to the mobile station UE using a relative rate control channel (RGCH). it can.

For example, when a certain mobile station UE is notified of an absolute rate control channel (“1 Mbps” as a maximum allowable transmission rate by AGCH from a serving cell and “60%” by a relative rate control channel (RGCH) from a non-serving cell. The maximum allowable transmission rate of uplink user data in the mobile station UE is “1 Mbps × 60% = 600 kbps”.
3GPP TSG-RAN R1-040773 3GPP TSG-RAN R2-050085 3GPP TSG-RAN 25.896 v6.1.0

  However, at the time of soft handover, the serving cell does not necessarily successfully receive all the uplink user data transmitted from the mobile station UE, and the non-serving cell successfully receives the uplink user data transmitted from the mobile station UE. In some cases. Therefore, a positive acknowledgment signal (Ack) may arrive from the non-serving cell to the mobile station UE.

  In the above-mentioned Non-Patent Document 2, it is assumed that the mobile station UE is communicating only with the serving cell (that is, assuming that soft handover is not performed), and a positive delivery confirmation signal (Ack) Was proposed to determine the transmission data block size in the next step based on the transmission data block size of the uplink user data transmitted, but the uplink when the mobile station UE is performing soft handover The method for increasing the transmission rate of user data is not clearly defined.

  In such a case, the method of increasing the transmission rate of the uplink user data may be different for each mobile station UE. In the worst case, sufficient hardware resources cannot be prepared in the radio base station NodeB, and reception is possible. There was a problem that failures might continue.

  Accordingly, the present invention has been made in view of the above points, and provides a transmission rate control method and a mobile station that define a method for a mobile station performing soft handover to increase the transmission rate of uplink user data. For the purpose.

  A first feature of the present invention is a transmission rate control method in which a mobile station increases the transmission rate of uplink user data to a maximum allowable transmission rate, wherein the mobile station acknowledges the uplink user data from a serving cell. Receiving an acknowledgment signal, and an uplink user transmitting the mobile station at a predetermined time based on a transmission data block size of the uplink user data that has already received the positive acknowledgment signal And a step of increasing the data transmission rate.

  The second feature of the present invention is a transmission rate control method in which the mobile station increases the transmission rate of the uplink user data to the maximum allowable transmission rate, wherein the mobile station is configured from at least one of a serving cell and a non-serving cell, Receiving a positive delivery confirmation signal for the uplink user data; and the mobile station based on a transmission data block size of the uplink user data that has already received the positive delivery confirmation signal. And a step of increasing a transmission rate of uplink user data to be transmitted at the time.

  A third feature of the present invention is a transmission rate control method in which a mobile station increases the transmission rate of uplink user data to a maximum allowable transmission rate, wherein the mobile station belongs to a radio link set to which a serving cell belongs. From the step of receiving a positive acknowledgment signal for the uplink user data, and the mobile station has already received the positive acknowledgment signal based on the transmission data block size of the uplink user data, And a step of increasing a transmission rate of uplink user data to be transmitted at a predetermined time.

  A fourth feature of the present invention is a mobile station that increases the transmission rate of uplink user data to a maximum allowable transmission rate, and receives a positive acknowledgment signal for the uplink user data from a serving cell. And a transmission rate control unit for increasing the transmission rate of the uplink user data to be transmitted at a predetermined time point based on the transmission data block size of the uplink user data that has already received the positive delivery confirmation signal. It is summarized as having.

  A fifth feature of the present invention is a mobile station that increases the transmission rate of uplink user data to a maximum allowable transmission rate, and positive acknowledgment of the uplink user data from at least one of a serving cell and a non-serving cell. A transmission confirmation signal receiving unit for receiving a signal, and a transmission rate of uplink user data to be transmitted at a predetermined time point based on a transmission data block size of the uplink user data that has already received the positive acknowledgment signal The gist of the present invention is to have a transmission rate control unit to increase.

  A sixth feature of the present invention is a mobile station that increases the transmission rate of uplink user data to a maximum allowable transmission rate, and positively transmits the uplink user data from a cell belonging to a radio link set to which a serving cell belongs. Based on the transmission data block size of the uplink user data that has already received the positive acknowledgment signal, transmission of the uplink user data to be transmitted at a predetermined time point, which receives the acknowledgment signal The gist of the present invention is to have a transmission rate control unit that increases the rate.

  As described above, according to the present invention, it is possible to provide a transmission rate control method and a mobile station that define a method for a mobile station performing soft handover to increase the transmission rate of uplink user data.

(Mobile communication system according to the first embodiment of the present invention)
A mobile communication system according to a 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 format information is transmitted to the HARQ processing unit 33c2.

  Here, the scheduling signal is a maximum allowable transmission rate of user data (for example, a maximum allowable transmission data block size or an enhanced dedicated physical data channel (E-DPDCH) transmitted in the mobile station UE transmitted by the absolute rate control channel (AGCH). ) And the dedicated physical control channel (DPCCH) transmission power ratio (maximum value (maximum allowable transmission power ratio), etc.), parameters related to the maximum allowable transmission rate, and relative speed control channel (RGCH). And a relative value for instructing to change the maximum allowable transmission rate.

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

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

In addition, the E-TFC selection unit 33c1 is configured to notify the speed holding timer T from the radio network controller RNC when setting a connection. Then, E-TFC selecting section 33c1, the total transmission in the period from the transmission time t _Ack, going back speed holding timer T content of the transmission data block has completed receiving the positive acknowledgment signal (Ack) at some point Of the transmission data block sizes of the data block, the maximum transmission data block size is selected.

  FIG. 4 shows an example of a graph for associating the maximum allowable transmission data block size updated at a certain time with a past maximum allowable transmission data block size.

  As shown in FIG. 4, since the maximum allowable transmission data block size to be updated is set to be larger than the past maximum allowable transmission data block size, as a result, the E-TFC selection unit 33c1 Is configured to increase the transmission rate of the uplink user data with time.

  However, as described above, the E-TFC selection unit 33c1 notifies the maximum allowable transmission rate broadcast from the connected cell (for example, the transmission power ratio between the E-DPDCH and the DPCCH, the transmission data block size, etc. ) Are sequentially input, the E-TFC selection unit 33c1 increases the transmission rate of the uplink user data within a range not exceeding the maximum allowable transmission rate.

  Further, as shown in FIG. 5, in the mobile communication system according to the present embodiment, the mobile station UE1 transmits a transmission data block that has already been achieved in another HARQ process, apart from the maximum allowable transmission data block size to be updated. The uplink user data can be transmitted with the size.

  FIG. 5 shows how the transmission data block size of uplink user data transmitted by the mobile station UE gradually increases. In the example of FIG. 5, a 4-process stop-and-wait HARQ is assumed.

  In the period of 4 [TTI] from the start of transmission of uplink user data, the delivery confirmation signal (Ack / Nack) from the radio base station NodeB has not arrived yet, so the mobile station UE has the initial maximum allowable transmission data block size. Transmit uplink user data.

  Next, at time t = 5 [TTI], the mobile station UE receives a negative acknowledgment signal (Nack) from the serving cell for the transmission data block transmitted at time t = 1 [TTI]. Therefore, a positive acknowledgment signal (Ack) is received from the non-serving cell, but the transmission data block size of the uplink user data is not increased.

  Even at time point t = 6 [TTI], the mobile station UE receives a negative acknowledgment signal (Nack), and thus does not increase the transmission data block size of the uplink user data.

  Next, at time t = 7 [TTI], the mobile station UE receives a positive acknowledgment signal (Ack) from the serving cell, and therefore increases the transmission data block size of the uplink user data.

  At time t = 8, 9 [TTI], the mobile station UE receives a negative delivery confirmation signal (Nack) from the serving cell, and therefore does not increase the transmission data block size of the uplink user data.

  At time t = 10 [TTI], since the mobile station UE has received a positive acknowledgment signal (Ack) from the serving cell, the uplink user is determined based on the transmission data block size at time t = 6 [TTI]. Increase the data transmission data block size.

  Even at time t = 11 [TTI], since the mobile station UE receives a positive acknowledgment signal (Ack) from the serving cell, the mobile station UE receives an uplink based on the transmission data block size at time t = 7 [TTI]. Increase the transmission data block size of user data.

  As described above, when the E-TFC selection unit 33c1 receives the positive delivery confirmation signal (Ack) for the uplink user data from the serving cell, the uplink user who has already received the positive delivery confirmation signal (Ack). Based on the transmission data block size of the data, the transmission rate of the uplink user data transmitted at a predetermined time 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. 6, the radio base station NodeB according to the present embodiment includes an HWY interface 11, a baseband signal processing unit 12, a call control unit 13, one or a plurality of transmission / reception units 14, and one or A plurality of amplifier units 15 and one or a plurality of transmission / reception antennas 16 are provided.

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

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

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

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

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

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

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

  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. 7, 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. 8, 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 combined output of the E-DPDCH RAKE unit 123d stored in the buffer 123m. It is configured to perform a diffusion process.

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

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

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

  As shown in FIG. 9, 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.

  FIG. 10 shows an example of how the area of the HARQ buffer 123o is secured. As shown in FIG. 10, the HARQ buffer 123o secures an area having a different size for each mobile station. In the example of FIG. 10, the HARQ buffer 123o reserves an area of the same size for each process. The address of the area in the HARQ buffer 123o reserved for each mobile station is managed by the HARQ management unit 123l2.

  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.

  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. 11, 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.

  According to the mobile communication system according to the first embodiment of the present invention, transmission transmission of uplink user data based on the transmission data block size of uplink user data that has already received a positive acknowledgment signal (Ack). In the method of increasing the speed, the serving cell reliably secures resources by increasing the transmission transmission speed of the uplink user data only in response to the positive acknowledgment signal (Ack) from the serving cell. Therefore, stable wireless quality can be realized.

(Modification 1)
With reference to FIG. 12, the modification 1 of this embodiment is demonstrated. In the first modification example, the mobile station UE performs soft handover with a cell other than the serving cell (non-serving cell), and the non-serving cell belongs to the same radio link set (RLS: Radio Link Set) as the serving cell.

  In such a case, the delivery confirmation signal (Ack / Nack) from the serving cell is usually the same as the delivery confirmation signal (Ack / Nack) from a cell (non-serving cell) belonging to the same radio link set (RLS) as the serving cell. Therefore, the mobile station UE can increase the reliability of the delivery confirmation signal (Ack / Nack) by the maximum ratio combining.

  Even if cells are in the same radio link set (RLS), if the retransmission function is different, each cell may transmit an acknowledgment signal (Ack / Nack) separately. In such a case, when the mobile station UE receives a positive delivery confirmation signal (Ack) from at least one of the serving cell and a cell (non-serving cell) belonging to the same radio link set (RLS) as the serving cell, positive delivery is already performed. Based on the transmission data block size of the uplink user data that has received the confirmation signal, the transmission rate of the uplink user data to be transmitted at a predetermined time is increased.

  According to the mobile communication system according to this modification, in response to a positive acknowledgment signal (Ack) from a non-serving cell belonging to the same radio link set (RLS) as the serving cell, the transmission rate of uplink user data is increased. By doing so, while ensuring resources in the serving cell and realizing a stable wireless quality, in response to a positive delivery confirmation signal (Ack) from other than the serving cell, the transmission rate of the uplink user data is increased. Therefore, the transmission rate of uplink user data can be increased quickly.

(Modification 2)
With reference to FIG. 13, the modification 1 of this embodiment is demonstrated. In the second modification example, the mobile station UE performs soft handover with a cell other than the serving cell (non-serving cell), and the non-serving cell belongs to a radio link set (RLS) different from the serving cell.

  In such a case, a delivery confirmation signal (Ack / Nack) from the serving cell and a delivery confirmation signal (Ack / Nack) from a cell (non-serving cell) belonging to a radio link set (RLS) different from the serving cell are different. Therefore, when the mobile station UE receives a positive delivery confirmation signal (Ack) from at least one of a serving cell and a cell (non-serving cell) belonging to a radio link set (RLS) different from the serving cell, a positive delivery confirmation has already been made. Based on the transmission data block size of the uplink user data receiving the signal, the transmission rate of the uplink user data transmitted at a predetermined time is increased.

  As shown in FIG. 13, during the period of 4 [TTI] from the start of transmission of uplink user data, since the acknowledgment signal (Ack / Nack) from the radio base station NodeB has not yet arrived, the mobile station UE Uplink user data is transmitted with the maximum allowable transmission data block size.

  Next, at time t = 5 [TTI], the mobile station UE receives a negative acknowledgment signal (Nack) from the serving cell for the transmission data block transmitted at time t = 1 [TTI]. However, since a positive acknowledgment signal (Ack) is received from the non-serving cell, the transmission data block size of the uplink user data is increased.

  At time t = 6 to 8 [TTI], the mobile station UE receives a negative acknowledgment signal (Nack), and therefore does not increase the transmission data block size of the uplink user data.

  At time t = 9 [TTI], the mobile station UE has received a negative acknowledgment signal (Nack) from the serving cell, but has received a positive acknowledgment signal (Ack) from the non-serving cell. The transmission data block size of the uplink user data is increased. The same applies hereinafter.

  As described above, when the E-TFC selection unit 33c1 receives a positive delivery confirmation signal (Ack) for uplink user data from one of the serving cell and the non-serving cell, the E-TFC selection unit 33c1 has already received a positive delivery confirmation signal (Ack). Is configured to increase the transmission rate of the uplink user data to be transmitted at a predetermined time point based on the transmission data block size of the uplink user data that is received.

  According to the mobile communication system according to the present modification, when the mobile station UE receives a positive delivery confirmation signal (Ack) regardless of the serving cell or the non-serving cell, the mobile station UE has already received a positive delivery confirmation signal (Ack). By increasing the transmission rate of the uplink user data based on the transmission data block size of the received uplink user data, it is possible to realize a quick increase in the transmission rate of the uplink user data.

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. 6 is a graph for explaining a state in which a maximum allowable transmission data block size is updated by a mobile station of a mobile communication system according to an embodiment of the present invention. It is a figure which shows a mode that a transmission data block size becomes large by the mobile station of the mobile communication system which concerns on one Embodiment of this 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). The figure which shows a mode that the area | region in the HARQ buffer of MAC-e and the layer 1 process part (uplink structure) is ensured in the baseband signal process part of the radio base station of the mobile communication system which concerns on one Embodiment of this invention. It is. 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 figure which shows a mode that a transmission data block size becomes large by the mobile station of the mobile communication system which concerns on the example 1 of a change of this invention. It is a figure which shows a mode that a transmission data block size becomes large by the mobile station of the mobile communication system which concerns on the modification 2 of this invention. 1 is an overall configuration diagram of a general mobile communication system. It is a figure for demonstrating the operation | movement at the time of transmitting bursty data in the conventional mobile communication system.

Explanation of symbols

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

Claims (6)

A transmission rate control method in which a mobile station increases the transmission rate of uplink user data to the maximum allowable transmission rate,
The mobile station receiving a positive acknowledgment signal for the uplink user data from a serving cell;
A step of increasing a transmission rate of uplink user data to be transmitted at a predetermined time based on a transmission data block size of the uplink user data for which the mobile station has already received the positive delivery confirmation signal. A transmission rate control method. A transmission rate control method in which a mobile station increases the transmission rate of uplink user data to the maximum allowable transmission rate,
The mobile station receiving a positive acknowledgment signal for the uplink user data from at least one of a serving cell and a non-serving cell;
A step of increasing a transmission rate of uplink user data to be transmitted at a predetermined time based on a transmission data block size of the uplink user data for which the mobile station has already received the positive delivery confirmation signal. A transmission rate control method. A transmission rate control method in which a mobile station increases the transmission rate of uplink user data to the maximum allowable transmission rate,
The mobile station receiving a positive acknowledgment signal for the uplink user data from a cell belonging to a radio link set to which a serving cell belongs;
A step of increasing a transmission rate of uplink user data to be transmitted at a predetermined time based on a transmission data block size of the uplink user data for which the mobile station has already received the positive delivery confirmation signal. A transmission rate control method. A mobile station that increases the transmission rate of uplink user data to the maximum allowable transmission rate,
A delivery confirmation signal receiving unit for receiving a positive delivery confirmation signal for the uplink user data from a serving cell;
A transmission rate control unit that increases the transmission rate of the uplink user data to be transmitted at a predetermined time point based on the transmission data block size of the uplink user data that has already received the positive delivery confirmation signal. A featured mobile station. A mobile station that increases the transmission rate of uplink user data to the maximum allowable transmission rate,
A delivery confirmation signal receiving unit that receives a positive delivery confirmation signal for the uplink user data from at least one of a serving cell and a non-serving cell;
A transmission rate control unit that increases the transmission rate of the uplink user data to be transmitted at a predetermined time point based on the transmission data block size of the uplink user data that has already received the positive delivery confirmation signal. A featured mobile station. A mobile station that increases the transmission rate of uplink user data to the maximum allowable transmission rate,
A delivery confirmation signal receiving unit for receiving a positive delivery confirmation signal for the uplink user data from a cell belonging to a radio link set to which the serving cell belongs;
A transmission rate control unit that increases the transmission rate of the uplink user data to be transmitted at a predetermined time point based on the transmission data block size of the uplink user data that has already received the positive delivery confirmation signal. A featured mobile station.

Images