JP2009261004A - Communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten a transmission delay time due to data retransmission between a mobile station and a base station. <P>SOLUTION: A signal requesting data transmission is transmitted from the mobile station to the base station, a signal instructing the data transmission is transmitted from the base station to the mobile station once the signal requesting the data transmission is received, and data to be transmitted from the mobile station to the base station are transmitted once the signal instructing the data transmission is received. When a signal indicating retransmission of data having been transmitted is transmitted, the data are retransmitted from the mobile station to the base station using the same modulation system as a modulation system used to transmit the data. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mobile station, a base station, a communication system, and a communication method for communicating packet data on a CDMA (Code Division Multiple Access) mobile communication system.

As a high-speed mobile communication system adopting the CDMA system, a communication standard called the third generation is adopted as IMT-2000 by the International Electric Union (ITU). W-CDMA (FDD: Frequency Division Duplex) started commercial service in Japan in 2001. The W-CDMA (FDD) system is a third generation mobile communication system, and aims to obtain a communication speed of about 2 Mbps at the maximum per mobile station. Regarding the W-CDMA (FDD) system, the first specification has been determined in the release 1999 version compiled by the standardization organization 3GPP (3rd. Generation Partnership Project) in 1999.
Various standards can be found on the Internet <URL: http: // www. 3 gpp. org / ftp / Specs / archive />.
Based on the above specifications, an on-demind channel allocation scheme for performance improvement / function expansion in the uplink is proposed in Non-Patent Document 1 below.

“AH64: Reducing control channel overhead for Enhanced Uplink”, [online], January, 7th-11th, 2003, 3GPPRAN1 # 30, [Search May 15, 2003], Internet <URL: http: // www. 3 gpp. org / ftp / tsg_ran / WG1_RL1 / TSGR1_30 / Docs / Zips / R1-030067. zip>

FIG. 1, a mobile station (UE: User Equipment) having a packet to be transmitted transmits a packet data transmission request to a base station (Node-B) through a transmission request channel (USICCH: Uplink Scheduling Information Control Channel). Upon receiving the request, the base station instructs a scheduling result, such as transmission timing assignment, to the mobile station using a downlink scheduling channel (DSACCH), and the mobile station transmits a data transmission channel (EUDCH: Describes a technology for sending data to an enhanced Uplink Dedicated Transport Channel) to a base station Has been.
In addition, information such as a modulation method at the time of packet data transmission is transmitted separately on a modulation format information channel (UTCCH: Uplink TFRI Control Channel). Also, the packet data reception determination result (so-called ACK / NACK) information in the base station is notified to the mobile station through a notification channel (DANCCH: Downlink Ack / Nack Control Channel).

Each channel described here is assumed to be an extension of a channel used in the conventional standard or introduction of a new channel, and details thereof have not been proposed.
However, in the transmission method disclosed in the above document, since the time required for the transmission processing cycle of (transmission request → allocation → data transmission → determination notification) is as long as 10 ms × 4 = 40 ms, the transmission data is correctly received on the base station side. If this is not the case, that is, if the so-called NACK determination is continued and the number of retransmissions of packet data increases, the transmission delay time becomes large, and there is a problem that the communication quality deteriorates for audio or video image information with severe delay requirements. is there.
The present invention has been made to solve the above-described problems, and an object thereof is to reduce a transmission delay time caused by data retransmission between a mobile station and a base station.

A mobile station according to the present invention notifies a transmission request of packet data to a base station, and the mobile station transmits packet data to the base station according to transmission schedule information determined based on the transmission request by the base station. A transmission unit that transmits a transmission request and packet data to the base station, a reception unit that receives the transmission schedule information from the base station and the reception determination result of the packet data transmitted by the transmission unit, and before the reception of the reception determination result is completed And a control unit for controlling the transmission unit so as to transmit a transmission request for new packet data.
The base station according to the present invention receives a packet data transmission request from a mobile station, notifies the mobile station of transmission schedule information determined based on the transmission request, and transmits packet data transmitted according to the transmission schedule information from the mobile station. When the receiving base station receives the transmission request from the mobile station and the packet data transmitted in response to the transmission request, and the reception determination result of the packet data transmitted according to the transmission schedule information is a reception failure A scheduling unit that preferentially assigns a transmission schedule to retransmission of packet data that failed to be received, and a scheduling unit that creates transmission schedule information, based on a transmission request for new packet data received by the receiving unit, and a scheduling unit Send transmission schedule information and reception decision result to mobile station It is obtained by a that transmission unit.
In the communication system according to the present invention, the mobile station notifies the base station of a packet data transmission request, and the mobile station transmits the packet data to the base station according to the transmission schedule information determined based on the transmission request by the base station. In the communication system in which the base station transmits the reception determination result for the received packet data to the mobile station, the mobile station next transmits the reception determination result from the base station for the transmitted packet data before completing the reception. The transmission request information for new packet data to be transmitted is transmitted.

As a result, a transmission request for packet data to be transmitted next can be notified to the base station efficiently, so that a delay time caused by retransmission of packet data can be shortened.
As a result, a transmission request for packet data to be transmitted next can be notified to the base station efficiently, so that a delay time caused by retransmission of packet data can be shortened.
As a result, the mobile station can efficiently notify the base station of a transmission request for packet data to be transmitted next, so that a delay time caused by retransmission of packet data can be shortened.

It is the schematic which shows the structure of the communication system by Embodiment 1 of this invention. It is a block diagram which shows the structure of the mobile station by Embodiment 1 of this invention. It is a block diagram which shows the structure of the base station by Embodiment 1 of this invention. It is a sequence diagram which shows the data transmission / reception procedure between a mobile station and a base station. It is a flowchart of the data transmission / reception process of the mobile station and base station by Embodiment 1 of this invention. It is a timing chart of the data transmission / reception process between the mobile station and base station by Embodiment 1 of this invention. It is a timing chart of the data transmission / reception process between the mobile station and base station by Embodiment 1 of this invention. It is a block diagram which shows the structure of the mobile station by Embodiment 2 of this invention. It is a block diagram which shows the structure of the base station by Embodiment 2 of this invention. It is a flowchart of the data transmission / reception process of the mobile station and base station by Embodiment 2 of this invention. It is a timing chart of the data transmission / reception process between the mobile station and base station by Embodiment 2 of this invention. It is a block diagram which shows the structure of the transmission data buffer of the mobile station by Embodiment 3 of this invention. It is a timing chart of the data transmission / reception process between the mobile station and base station by Embodiment 3 of this invention. It is a flowchart of the data transmission / reception process of the mobile station and base station by Embodiment 3 of this invention. It is a timing chart of the data transmission / reception process between the mobile station and base station by the 1st modification of Embodiment 3 of this invention. It is a figure which shows the channel multiplexing method by the 1st modification of Embodiment 3 of this invention. It is a timing chart of the data transmission / reception process between the mobile station and base station by the 2nd modification of Embodiment 3 of this invention. It is a figure which shows the channel multiplexing method by the 2nd modification of Embodiment 3 of this invention. It is a timing chart of the data transmission / reception process between the mobile station and base station by the 3rd modification of Embodiment 3 of this invention. It is a figure which shows the channel multiplexing method by the 3rd modification of Embodiment 3 of this invention. It is a timing chart of the data transmission / reception process between the mobile station and base station by the 4th modification of Embodiment 3 of this invention.

  Hereinafter, in order to describe the present invention in more detail, the best mode for carrying out the present invention will be described with reference to the accompanying drawings.

Embodiment 1 FIG.
FIG. 1 is a schematic diagram showing a configuration of a communication system 101 according to Embodiment 1 of the present invention.
As shown in the figure, the communication system 101 includes a mobile station 102, a base station 103, and a base station control device 104. The base station 103 communicates with a plurality of mobile stations 102 within a certain range. The communication range of the base station 103 is called a sector or a cell. In the figure, only one mobile station 102 is shown.
The base station control device 104 is connected to an external network 105 such as a public telephone network or the Internet, and relays packet communication between the base station 103 and the external network 105.
Data communication between the mobile station 102 and the base station 103 is performed using a plurality of channels. As shown in the figure, the uplink communication channel used for transmission from the mobile station 102 to the base station 103 includes USICCH 106 (Uplink Scheduling Information Control Channel: transmission request channel), and UTCCH 108 (Uplink TFRI Control Channel: modulation format information channel). ), EUDCH109 (Enhanced Uplink Dedicated Transport Channel: data transmission channel). Further, the downlink communication channels used for transmission from the base station 103 to the mobile station 102 include DSACCH 107 (Downlink Scheduling Assignment Channel: allocation channel) and DANCCH 110 (Downlink Ack / Nack Control Channel: notification channel).

Note that these channels are channels that are not used in the conventional standard, and when newly set, in a new release of the standard TS25.211, consistency with the conventional standard (Backward Compatibility) The format is additionally specified while ensuring
In W-CDMA, the mobile station 102 is referred to as a UE (User Equipment), the base station 103 is referred to as a Node-B, and the base station controller 104 is referred to as an RNC (Radio Network Controller).

FIG. 2 is a block diagram showing a configuration of mobile station 102 according to Embodiment 1 of the present invention.
As shown in the figure, the mobile station 102 includes an upper processing unit 401 (Upper Layer), a transmission data buffer (transmission data storage unit) 402 (TX buffer), a packet transmission control unit (control unit) 403 (Packet TX Control), A transmission power control unit 406 (Power Control), a multiplexing unit 407 (MUX), a transmission unit 408 (TX), an antenna 409, a reception unit 410 (RX), and a separation unit 411 (DEMUX) are provided. The upper processing unit 401, the transmission data buffer 402, the packet transmission control unit 403, the transmission power control unit 406, the multiplexing unit 407, the transmission unit 408, the reception unit 410, and the separation unit 411 are parts constituting the processor of the mobile station 102. And are divided for convenience according to program modules for operating the processor.
The packet transmission control unit 403 includes a request control unit 420 and a data transmission control unit 421, and the data transmission control unit 421 further includes a modulation control unit 404 (TFRI Control).

The upper processing unit 401 performs processing of an upper protocol layer such as a TCP / IP layer, and these processes are based on known techniques.
FIG. 3 is a block diagram showing the configuration of base station 103 according to Embodiment 1 of the present invention.
As shown in the figure, the base station 103 includes an antenna 501, a receiving unit 502 (RX), a transmitting unit 503 (TX), a separating unit 504 (DEMUX), a received data buffer 505 (RX buffer), and a transmission scheduler (scheduling unit). 506 (Scheduler), an upper processing unit 507 (Upper layer), and a multiplexing unit 508 (MUX). The reception unit 502, the transmission unit 503, the separation unit 504, the reception data buffer 505, the transmission scheduler 506, the upper processing unit 507, and the multiplexing unit 508 are parts constituting the processor of the base station 103 and operate the processor They are divided for convenience according to program modules.

The transmission scheduler 506 includes a data reception processing unit 520 and a retransmission control unit 521.
The upper processing unit 507 performs processing of an upper protocol layer such as a TCP / IP layer, and these processes are based on known techniques.
Note that some of the functions of the base station 103 may be provided in the base station control device 104.
Next, the operation will be described.
First, the role of each channel used in data transmission / reception between the mobile station 102 and the base station 103 and the flow of transmission / reception procedures will be described with reference to FIG.
When packet data to be transmitted to the base station 103 is generated in the mobile station 102, the mobile station 102 transmits transmission data size (Queue Size) and transmission power margin information (Power Margin) indicating a margin up to the maximum transmission power of the mobile station 102. It transmits to base station 103 using USICCH 106 (step ST201).

When the base station 103 receives the transmission data by the USICCH 106, the base station 103 extracts the transmission data size (Queue Size) and the transmission power margin information (Power Margin), and moves the mobile station information and other mobile stations 102 in the cell. Based on the station information, a schedule such as packet data transmission / reception timing between each mobile station 102 and base station 103 is determined. The determined transmission / reception timing information (Map) and the maximum allowable power increase / decrease amount (Max Power Margin) assigned to each mobile station 102 are notified to the mobile station 102 using the DSACCH 107 (step ST202).
When mobile station 102 receives transmission data by DSACCH 107, mobile station 102 transmits the current modulation scheme (TFRI) (Transport Format Resource Indicator) or the like in mobile station 102 to base station 103 using UTCCH 108 (step ST203).

Further, the mobile station 102, based on the maximum allowable power increase / decrease amount (Max Power Margin) included in the transmission data by the DSACCH 107, and the transmission timing information (Map), packet data (Data) modulated according to its own modulation scheme. It transmits to base station 103 using EUDCH 109 (step ST204).
The base station 103 demodulates the packet data (Data) included in the transmission data by the EUDCH 109 based on the modulation scheme (TFRI) included in the transmission data by the UTCCH 108, and determines whether or not the data has been correctly received.
As a reception determination result, the base station 103 notifies the mobile station 102 of ACK when it is determined that the data is correctly received, and NACK when it is determined that the data is incorrect, using the DANCCH 110 ( Step ST205).
When the mobile station 102 receives ACK from the base station 103, the communication process from step ST201 to step ST205 is repeated for the next packet data transmission.

On the other hand, when the mobile station 102 receives NACK from the base station 103, the communication process from step ST201 to step ST205 is repeated in order to transmit the same packet data from the mobile station 102 to the base station 103 again.
Next, details of data transmission / reception processing of mobile station 102 and base station 103 according to Embodiment 1 will be described.

FIG. 5 is a flowchart of packet data transmission / reception processing between mobile station 102 and base station 103 according to Embodiment 1 of the present invention.
6 and 7 are timing charts of packet data transmission / reception processing between the mobile station 102 and the base station 103. FIG. FIG. 6 shows a case where all the packet data transmitted from the mobile station 102 is correctly received by the base station 103, and FIG. 7 shows that a part of the packet data (DATA1) transmitted from the mobile station 102 is transmitted to the base station 103. The case where the station 103 does not receive correctly and NACK is notified from the base station 103 as the reception determination result of DATA1 is shown. In the figure, the vertical axis represents each channel, and the horizontal axis represents time. An arrow (solid line) represents processing of the base station 103, and an arrow (broken line) represents processing of the mobile station 102. REQ1 to REQ5 are transmission requests sequentially transmitted from the mobile station 102 using the USICCH 106, ASS1 to ASS5 are scheduling instruction information for the transmission requests REQ1 to REQ5 transmitted from the base station 103 using the DSACCH 107, and DATA1 to DATA4 are Packet data transmitted from the mobile station 102 using the EUDCH 109, ACK1 to ACK4 are reception determination results transmitted from the base station 103 using the DANCCH 110, and the determination result of ACK or NACK is shown in parentheses. . Further, although modulation scheme information transmitted from the mobile station 102 using the UTCCH 108 is not illustrated, it is assumed that the modulation scheme information is transmitted at the same time as DATA1 to DATA4 or partially in advance.

Hereinafter, packet data transmission / reception processing between the mobile station 102 and the base station 103 will be described with reference to FIGS. 5 to 7 and FIGS. 2 and 3.
First, in the mobile station 102, the transmission data buffer 402 continues monitoring until packet data to be transmitted to the base station 103 is supplied from the upper processing unit 401 (FIG. 5, step ST601).
The packet data supply processing from the upper processing unit 401 to the transmission data buffer 402 will be described with reference to FIG. The upper processing unit 401 performs predetermined processing of the upper protocol layer, and outputs one or more packet data (Data) to be transmitted to the base station 103 to the transmission data buffer 402. Here, it is assumed that the upper processing unit 401 performs processing of the TCP / IP layer.
Next, the process proceeds to step ST602, where the transmission data buffer 402 updates the size of the packet data (Queue size) held inside based on the size of the packet data input from the higher order processing unit 401.
Also, the transmission power control unit 406 supplies transmission power margin information (Power margin) to the multiplexing unit 407.

Next, it progresses to step ST603 and transmits transmission request REQ1 to the base station 103 using USICCH106.
REQ1 is generated in the multiplexing unit 407. The multiplexing unit 407 receives the packet data size (Queue size) in the transmission data buffer 402 supplied via the packet transmission control unit 403 and the transmission power margin information (Power margin) supplied from the transmission power control unit 406. Multiplex generation is performed, and the signal is output to the transmission unit 408 as a USICCH 106 signal. The transmitting unit 408 converts the multiplexed USICCH 106 signal supplied from the multiplexing unit 407 into a radio frequency signal using a known technique. Further, based on the transmission power control information (Power) supplied from the transmission power control unit 406, the radio frequency signal is amplified to a transmission power necessary for transmission by a known technique and transmitted to the base station 103 via the transmission antenna 409. To do.

Here, the transmission power control unit 406 transmits transmission power control information (Power) necessary for transmission to the base station 103 to the transmission unit 408 according to the modulation scheme information (TFRI) supplied from the modulation control unit 404. Output.
Base station 103 monitors reception of a transmission request from mobile station 102 via USICCH 106 (step ST604).
When the USICCH 106 radio frequency signal is received via the antenna 501, the received signal is supplied to the receiving unit 502 and converted into a baseband signal. The conversion from the radio frequency signal to the baseband signal is performed by a known technique.
The baseband signal is supplied to the separation unit 504, and the separation unit 504 separates the signals of the respective channels. Separation section 504 extracts data size information (Queue Size) and transmission power margin information (Power margin) from the signal of USICCH 106 and supplies the extracted information to transmission scheduler 506.
Next, in step ST605, the base station 103 generates a transmission schedule for the received transmission request REQ1.

  Based on the size information (Queue Size), transmission power margin information (Power margin), and other mobile station information of transmission data supplied from the demultiplexing unit 504, the transmission scheduler 506 transmits packets to the base station 103. A transmission timing at the time of transmitting data is determined, and scheduling instruction information (Scheduling assignment) is generated. At this time, as a method of assigning (scheduling) transmission timing and the like performed by the transmission scheduler 506, a method of prioritizing the mobile station 102 with a large amount of untransmitted packets, a method of prioritizing the mobile station 102 having a transmission power margin, a transmission request A method of assigning in the order received, a method of assigning according to a predetermined order (round robin), a method of preferentially assigning to the mobile station 102 with less propagation loss or interference, that is, having a good communication environment (Max C / I), round robin and Max Various methods such as an intermediate method of C / I (Proportional Fair) can be applied, and in designing the base station apparatus and the communication system, for example, it is designed and selected so that the throughput of the entire cell becomes the highest. .

The transmission scheduler 506 supplies the generated scheduling instruction information (Scheduling assignment) to the multiplexing unit 508.
Multiplexing section 508 generates the supplied scheduling instruction information as a DSACCH 107 signal and outputs the signal to transmitting section 503.
Here, although the transmission / reception timing information (Map) and the maximum allowable power increase / decrease amount (Max Power Margin) are shown as the scheduling instruction information, the maximum transmission rate, the temporarily limited transmission rate, and the minimum guaranteed transmission rate It is possible to instruct or add additional information related to transmission rate such as power-related information such as maximum permissible transmission power and short-term transmission power. Alternatively, it is possible to give a certain relationship between the various types of information and instruct it indirectly. For example, since the transmission rate and the transmission power are in a proportional relationship, instead of directly specifying the transmission rate and notifying the mobile station 102, it is possible to notify the mobile station 102 as the transmission power.

Next, in step ST606, the generated scheduling instruction information ASS1 is notified to the mobile station 102 via the antenna 501.
In step ST607, the mobile station 102 monitors reception of ASS1 using the DSACCH 107.
When the DSACCH 107 radio frequency signal from the base station 103 is received via the antenna 409, the radio frequency signal is supplied to the receiving unit 410. The receiving unit 410 converts the supplied radio frequency signal into a baseband signal using a known technique, and supplies the baseband signal to the separation unit 411. The separation unit 411 separates the supplied baseband signal into signals for each channel using a known technique. The separation unit 411 extracts scheduling instruction information from the separated DSACCH 107 signal and supplies the scheduling instruction information to the packet transmission control unit 403.

The packet transmission control unit 403 extracts data transmission timing (TX timing) from the supplied scheduling instruction information (Scheduling Assignment) and supplies the data transmission timing (TX timing) to the transmission buffer 402.
At the same time, the mobile station 102 proceeds to the untransmitted data confirmation processing in step ST601 and transmits the next transmission request REQ2 to the base station 103. The base station 103 receives REQ2 in step ST604, generates scheduling instruction information ASS2 corresponding to the transmission request REQ2 in step ST605, and transmits ASS2 to the mobile station 102 in step ST606.
The request control unit 420 processes the transmission request REQn (n = 1, 2, 3, 4,...) And the scheduling instruction information ASSn from the base station 103 for REQn, that is, REQ1 transmission (step ST603) → ASS1. The process of reception (step ST607) → REQ2 transmission (step ST603) → ASS2 reception (step ST607) →... Is managed.

By repeating the above processing, transmission of transmission requests REQ1 to REQ5 shown in FIGS. 6 and 7 and notification of scheduling instruction information ASS1 to ASS5 from the base station 103 corresponding to REQ1 to REQ5 are performed.
In Step ST608, the packet transmission control section 403 of the mobile station 102 determines whether the transmission request REQ1 corresponding to the scheduling instruction information ASS1 received from the base station 103 is for the first transmission, or the reception determination result received last time is ACK. It is determined whether or not.
When REQ1 is the first transmission, or when the previous reception determination result is ACK, the process proceeds to step ST609a and the first packet data transmission process is performed. In other cases, the process proceeds to step ST609b to perform retransmission processing of packet data.
Hereinafter, details of packet data transmission processing to base station 103 using EUDCH 109 in step ST609a will be described.

  Based on the transmission data size (Queue size) of the packet data notified from the transmission data buffer 402 and the scheduling instruction information (Scheduling Assignment) ASS1 supplied from the separation unit 411, the modulation control unit 404 of the mobile station 102 The modulation method and data size information (modulation method information: TFRI) of the packet data to be transmitted to the station 103 are determined. For example, when transmission / reception timing information (Map) is notified as scheduling instruction information, the mobile station 102 transmits packet data within the timing range. Further, when the maximum allowable power increase / decrease amount (Max Power Margin) is notified, the signal power required for the communication service and a certain modulation scheme is set as vs. This is determined by determining the transmission rate that can be transmitted within the range of the maximum allowable power increase / decrease amount based on the noise (Eb / No) and calculating the data amount that can be transmitted in one transmission. When the maximum transmission rate is notified as scheduling instruction information, the transmission rate is within the range of the notified maximum transmission rate so that as much packet data in the transmission data buffer 402 as possible can be transmitted in one transmission. Is determined by calculating the amount of data that can be transmitted at one time. The amount of data that can be transmitted in one transmission is determined in accordance with a predetermined format determined in advance according to the contents of each element such as the transmission rate specification defined in the standard, the maximum transmission power of the mobile station 102, the propagation environment, and the like. It has been. It is assumed that this predetermined format is held by both the mobile station 102 and the base station 103.

The determined TFRI is supplied to the transmission data buffer 402, the multiplexing unit 407, and the transmission power control unit 406.
The transmission data buffer 402 transmits packet data (from the transmission data buffer 402 to the multiplexing unit 407 so that transmission from the mobile station 102 to the base station 103 matches the data transmission timing (TX timing) supplied from the packet transmission control unit 403. EUDCH TX data). At this time, the data amount of packet data (EUDCH TX data) supplied to multiplexing section 407 for transmission as DATA1 is determined based on the modulation method and data size included in modulation scheme information (TFRI). The transmission data buffer 402 supplies the amount of data to the multiplexing unit 407.
The multiplexing unit 407 multiplexes at least one packet data (EUDCH TX data) based on the modulation scheme information (TFRI), and the EUDCH 109 signal from the multiplexed packet data information (EUDCH TX data). Generate. Also, a UTCCH 108 signal is generated from the modulation scheme information (TFRI), these signals are code-multiplexed, and then output to the transmission section 408.

The transmission unit 408 converts the signals of the UTCCH 108 and the EUDCH 109 supplied from the multiplexing unit 407 into radio frequency signals by a known technique, and based on the transmission power control information (Power) input from the transmission power control unit 406, The radio frequency signal is amplified to a transmission power necessary for transmission by a known technique and output to the antenna 409. The antenna 409 transmits DATA1 to the base station 103.
In step ST610, the base station 103 receives DATA1 and modulation scheme information (TFRI) transmitted from the mobile station 102 via the antenna 501. The antenna 501 receives these radio frequency signals and outputs them to the receiving unit 502. Receiving section 502 converts each radio frequency signal of UTCCH 108 and EUDCH 109 into a baseband signal by a known technique, and outputs the baseband signal to demultiplexing section 504.

Separating section 504 separates the baseband signal into each channel signal, extracts modulation scheme information (TFRI) from the UTCCH 108 signal, and demodulates and extracts the content of DATA1 from the EUDCH 109 signal using this TFRI. . The separation unit 504 determines whether DATA1 has been correctly received. Separation section 504 outputs ACK as a reception determination result to multiplexing section 508 via transmission scheduler 506 when it is determined that DATA1 has been correctly received, and NACK is received as a reception determination result when it has been determined that DATA1 has not been correctly received.
In addition, when the separating unit 504 determines that the data DATA1 has been correctly received, the separating unit 504 outputs the content of the received data (EUDCH RX data) DATA1 to the received data buffer 505. On the other hand, when the separating unit 504 determines that the DATA1 has not been correctly received, the separating unit 504 discards the received data (EUDCH RX data) DATA1.
Next, in step ST611, multiplexing section 508 generates reception determination result (ACK / NACK) ACK1 notified through transmission scheduler 506 as a signal of DANCCH 110, and outputs the result to transmitting section 503. Here, it is assumed that DATA1 is correctly received and ACK1 is ACK as shown in the example of FIG.
The transmission unit 503 transmits ACK 1 to the mobile station 102 via the transmission / reception antenna 501.

Next, in step ST612, the reception data buffer 505 supplies the correctly received packet data DATA1 to the upper processing unit 507.
Next, in step ST616, the transmission scheduler 506 of the base station 103 checks whether or not the next scheduling information has been transmitted to the mobile station 102. If there is already transmitted scheduling information, the process proceeds to step ST610. Then, the reception of packet data corresponding to the scheduling information is awaited. If there is no transmitted scheduling information, the process proceeds to step ST604, and a new transmission request from the mobile station 102 is awaited.
As described above, after receiving ASS1 from the base station 103 in step S607, the mobile station 102 proceeds to step ST601 and performs transmission processing of the next transmission request REQ2. For this reason, before the mobile station 102 receives the reception determination result ACK1 for DATA1 transmitted in step ST611, the transmission request REQ2 is transmitted from the mobile station 102 to the base station 103.

Therefore, if the base station 103 has already notified the mobile station 102 of the scheduling instruction information ASS2 for REQ2 when the base station 103 transmits ACK1 to the mobile station 102, the DATA2 reception processing is continued without losing time. It can be carried out.
Similarly, before the mobile station 102 completes reception of the reception determination result ACKn for the transmission data DATAn (n = 1, 2, 3, 4,...) Transmitted from the mobile station 102, the next transmission request REQn + 1. Is transmitted to the base station 103, even when the amount of transmission data held by the mobile station 102 is large, it is possible to efficiently perform transmission / reception processing.
In step ST613, the mobile station 102 monitors reception of the reception determination result ACK1 for DATA1 from the base station 103.
When a radio frequency signal of DANCCH 110 is received from the base station 103 via the antenna 409, the received radio frequency signal is supplied to the reception unit 410 and converted into a baseband signal. The baseband signal is supplied to the separation unit 411, and the separation unit 411 extracts the DATA1 reception determination result (ACK / NACK) ACK1 included in the DANCCH 110 signal. The extracted ACK1 is output to the packet transmission control unit 403.

If the reception determination result ACK1 for DATA1 is ACK in step ST613, the packet transmission control section 403 determines that DATA1 has been correctly received by the base station 103. If ACK1 is NACK, it is determined that DATA1 was not correctly received by the base station 103.
If the base station 103 correctly receives DATA1, the process proceeds to step ST614, where the packet transmission control unit 403 checks whether there is any remaining packet data to be transmitted in the transmission data buffer 402.
On the other hand, if DATA1 has not been correctly received by the base station 103, the base station 103 moves to step ST617 and determines whether or not new scheduling instruction information ASS2 is received from the base station 103.

Here, a case where the reception determination result ACK1 for DATA1 is ACK will be described as an example. The operation when ACK1 is NACK will be described later.
If it is determined in step ST614 that packet data to be transmitted remains in the transmission buffer 402, the process proceeds to step ST615, where the packet transmission control unit 403 is notified of new scheduling instruction information from the base station 103. Determine whether or not. When new scheduling information ASS2 is notified, the process proceeds to step ST609a, and the first transmission of packet data DATA2 corresponding to the transmission request REQ2 is performed. On the other hand, if ASS2 is not notified, the process proceeds to step ST602, and REQ2 is transmitted again.
If it is determined in step ST614 that there is no packet data to be transmitted in the transmission data buffer 402, the process proceeds to step ST601, where the packet transmission control unit 403 inputs new data from the upper processing block 401. Wait for.

If the base station 103 determines in step ST611 that DATA1 transmitted from the mobile station 102 has not been correctly received, the base station 103 transmits NACK to the mobile station 102 as a reception determination result ACK1.
Since the reception determination result is NACK, the separation unit 504 discards the received DATA1 and does not output it to the reception data buffer 505.
In the base station 103, it is known that DATA1 is retransmitted from the mobile station 102 when the reception determination of DATA1 is performed. Therefore, the base station 103 does not create and transmit the scheduling instruction information ASS2 for the second transmission request REQ2 that has already been transmitted from the mobile station 102. Instead, as shown in FIG. 7, scheduling instruction information ASS1 (re) for DATA1 retransmission is created and transmitted to the mobile station 102 (step ST606).

The data reception processing unit 520 manages the reception determination result ACK for DATA received from the mobile station 102. When the NACK determination is made for the received DATA, the data reception processing unit 520 instructs the retransmission control unit 521 to generate and transmit retransmission scheduling instruction information ASS (re). The retransmission control unit 521 manages the transmission processing of the scheduling instruction information ASS and the retransmission scheduling instruction information ASS (re) for the first transmission request REQ.
As the data reception processing unit 520 and the retransmission control unit 521 cooperate as described above, a transmission / reception cycle as shown in FIGS. 6 and 7 is executed.
The mobile station 102 receives the reception determination result ACK1 for DATA1 in step ST613, and if the result is NACK, the mobile station 102 proceeds to step ST617.

If it is determined in step ST617 that the mobile station 102 has already received the DATA1 retransmission credit scheduling instruction information ASS1 (re) from the base station 103, the process proceeds to step ST609b. If ASS1 (re) has not been received, the process returns to step ST602, and REQ1 is transmitted again.
In step ST609b, the packet transmission control section 403 extracts the DATA1 retransmission timing (TX timing) from the ASS1 (re) supplied via the demultiplexing section 411, notifies the transmission data buffer 402 to prepare for the retransmission of DATA1. .
Note that the modulation control unit 404 notifies the transmission data buffer 402, the multiplexing unit 407, and the transmission power control unit 406 of new modulation method information (TFRI) when changing the modulation method at the time of DATA1 retransmission. .

The transmission data buffer 402 is based on the transmission timing (TX timing) notified from the packet transmission control unit 403 and the modulation scheme information (TFRI) supplied from the modulation control unit 404 as needed, and thus DATA1 (EUDCH TX data). Is supplied to the multiplexing unit 407.
The multiplexing unit 407 multiplex-generates DATA1 (EUDCH TX data) to be transmitted using the EUDCH 109 and supplies it to the transmission unit 408. The transmission unit 408 retransmits DATA1 to the base station 103 via the antenna 409.
The base station 103 receives the retransmission data DATA1 (re) in step ST610, and if the reception determination result of DATA1 (re) is ACK, the base station 103 transmits ACK1 (ACK) as the reception determination result to the mobile station 102 (step ST611). ).

As described above, the request control unit 420 of the mobile station 102 manages reception of the scheduling instruction information ASSn from the base station 103 in response to the transmission request REQn. The request control unit 420 transmits the second transmission request REQ2 (re) to the base station 103 again when confirming that it has received the scheduling instruction information ASS1 (re) for retransmission of DATA1 from the base station 103. You are in control.
Therefore, after transmitting the reception determination result ACK1 (ACK) for DATA1 (re), the base station 103 continues to transmit scheduling instruction information ASS2 for the transmission request REQ2 (re) to the mobile station 102.
In step ST613, the mobile station 102 confirms that the reception determination result for DATA1 (re) is ACK, and confirms that the scheduling instruction information ASS2 corresponding to REQ2 has been received. Transmit to station 103.

The data transmission control unit 421 of the mobile station 102 transmits / receives DATAn (n = 1, 2, 3, 4,...) And the reception determination result ACKn for DATAn, that is, DATA1 transmission → ACK1 reception → DATA2 transmission → It manages the process of receiving ACK2. A data transmission / reception cycle as shown in FIGS. 6 and 7 is executed by notifying the contents of the reception results ASS and ACK for each REQ and DATA transmission between the request control unit 420 and the data transmission control unit 421. The
As described above, according to the first embodiment, before the mobile station 102 receives the reception determination result of the base station 103 for the transmission data from the mobile station 102, the mobile station 102 transmits the next transmission data. A request is transmitted to the base station 103. Thereby, there is an effect that the time until the next transmission data is transmitted to the base station 103 can be shortened. Also, the reception determination result for certain transmission data is NACK, and even if it is necessary to retransmit in the base station 103, it can be retransmitted quickly, and the delay time of the transmission process can be reduced.
In addition, the transmission interval of transmission requests may be shorter than that described in the related art (for example, 2 ms). In this case, the information amount of the transmission request REQ and the scheduling instruction information ASS in one transmission can be reduced. For this reason, since the whole transmission cycle can be shortened with one transmission time, the transmission delay of the first time and retransmission data can be reduced.

Embodiment 2. FIG.
FIG. 8 is a block diagram showing a configuration of mobile station 102 according to Embodiment 2 of the present invention. The same reference numerals as those in FIG. 2 represent the same components. FIG. 9 is a block diagram showing the configuration of base station 103 according to Embodiment 2 of the present invention. The same reference numerals as those in FIG. 3 represent the same components.
In the second embodiment, the information transmitted from the mobile station 102 to the base station 103 using the USICCH 106 includes a transmission data size (Queue Size) similar to that in the first embodiment and a margin up to the maximum transmission power of the mobile station 102. In addition to the transmission power margin information (Power Margin) shown, a transmission transmission rate change request (Rate Request) RR is included.
Also, information transmitted from the base station 103 to the mobile station 102 using the DSACCH 107 includes transmission / reception timing information (Map) similar to that in the first embodiment, and the maximum allowable power increase / decrease amount (Max Power) allocated to each mobile station 102. In addition to (Margin), a transmission transmission rate permission (Rate Grant) RG is included as a permission rate for the transmission transmission rate change request RR.
The transmission transmission rate change request RR is information for requesting an increase or decrease in data transmission speed. The transmission transmission rate permission RG is information that permits an increase or decrease in the data transmission rate in response to the transmission transmission rate change request RR.

Next, data transmission / reception processing of mobile station 102 and base station 103 according to Embodiment 2 will be described.
FIG. 10 is a flowchart of packet data transmission / reception processing between mobile station 102 and base station 103 according to Embodiment 2 of the present invention.
FIG. 11 is a timing chart of packet data transmission / reception processing between the mobile station 102 and the base station 103. In the figure, the vertical axis represents each channel, and the horizontal axis represents time. An arrow (solid line) represents processing of the base station 103, and an arrow (broken line) represents processing of the mobile station 102. RR1 to RR5 are transmission transmission rate change requests sequentially transmitted from the mobile station 102 using the USICCH 106, and RG1 to RG5 are transmitted from the base station 103 using the DSACCH 107, and each transmission transmission rate change request RR1 to RR5 Transmission rate permission for transmission, DATA1 to DATA4, and ACK1 to ACK4 are the same as in FIG. Further, although modulation scheme information transmitted from the mobile station 102 using the UTCCH 108 is not illustrated, it is assumed that the modulation scheme information is transmitted at the same time as DATA1 to DATA4 or partially in advance. In the figure, only transmission transmission rate change requests RR1 to RR5 are shown as information transmitted using USICCH 106, but REQ1 to REQ5 are also transmitted as in the first embodiment. Similarly, only transmission transmission rate grants RG1 to RG5 are shown as information transmitted by DSACCH 107, but scheduling instruction information ASS1 to ASS5 is also transmitted.

Hereinafter, packet data transmission / reception processing between the mobile station 102 and the base station 103 will be described with reference to FIGS. In FIG. 10, steps for performing the same processing as in the first embodiment are indicated by the same numbers as in FIG. Here, step ST703 of mobile station 102 and step ST706 of base station 103, which are different from those in Embodiment 1, will be described in detail.
In step ST703, the mobile station 102 transmits a transmission rate change request RR1 for transmission to the base station 103 using the USICCH 106.
The transmission transmission rate change request RR1 is generated by the multiplexing unit 407. The packet transmission control unit 403 displays the transmission rate increase request information as RR1 when the data size (Queue size) notified from the transmission data buffer 402 increases from the previous time, and the transmission rate decrease request when it decreases. Information is notified to the multiplexing unit 407.
Various methods other than the above can be considered as a method for determining the transmission rate change request for transmission RR. For example, the transmission rate change request RR may be determined based on a long-term average of a data size (Queue size) value.

The multiplexing unit 407 transmits the data size (Queue size) in the transmission data buffer 402 notified from the packet transmission control unit 403, the transmission rate change request RR1 for transmission, and the transmission power margin supplied from the transmission power control unit 406. Information (Power margin) is multiplexed and output to the transmission unit 408 as a signal of the USICCH 106.
The transmitting unit 408 converts the multiplexed USICCH 106 signal supplied from the multiplexing unit 407 into a radio frequency signal using a known technique. Further, based on the transmission power control information (Power) supplied from the transmission power control unit 406, the radio frequency signal is amplified to a transmission power necessary for transmission by a known technique and transmitted to the base station 103 via the transmission antenna 409. To do.
On the other hand, the base station 103 monitors reception of RR1 by the USICCH 106 from the mobile station 102 in step ST604.
When the USICCH 106 radio frequency signal is received via the antenna 501, the received signal is supplied to the receiving unit 502 and converted into a baseband signal. The conversion from the radio frequency signal to the baseband signal is performed by a known technique.
The baseband signal is supplied to the separation unit 504, and the separation unit 504 separates the signals of the respective channels. The separation unit 504 extracts data size information (Queue Size), transmission transmission rate change request RR1 and transmission power margin information (Power margin) from the signal of the USICCH 106, and supplies the extracted data to the transmission scheduler 506.

Next, in step ST605, the base station 103 generates a transmission schedule.
The transmission scheduler 506, for example, a cell based on the transmission data size information (Queue Size), transmission transmission rate change request RR1, transmission power margin information (Power margin), and other mobile station information supplied from the separation unit 504 Transmission rate change request (RR) for transmission requested from all mobile stations 102, priority of service to be communicated, priority of mobile station, base generated by transmission at transmission rate requested by each mobile station 102 Scheduling for each mobile station 102 is performed from the calculation of the amount of interference power at the receiving antenna end of the station 103. As a scheduling method, as in the first embodiment, a method of prioritizing the mobile station 102 with a large amount of untransmitted packets, a method of prioritizing the mobile station 102 with a transmission power margin, a method of assigning transmission requests in the order received, A method of assigning according to a predetermined order (round robin), a method of preferentially assigning to the mobile station 102 with less propagation loss or interference, that is, having a good communication environment (Max C / I), and intermediate between round robin and Max C / I A wide variety of methods such as Proposal Fair can be applied. Under the condition that the throughput of the entire cell is maximized, the transmission rate that can be transmitted to each mobile station 102 is selected from the transmission rates that can be transmitted to the mobile station 102 at the same time. Scheduling instruction information for transmitting packet data to the station 103 and a transmission transmission rate for the transmission transmission rate change request RR1 are determined to generate a transmission transmission rate permission RG1. Similarly to the transmission rate change request RR, the transmission rate permission RG1 for transmission includes transmission rate increase request information or transmission rate decrease request information when the transmission rate is decreased.

The transmission scheduler 506 supplies the generated transmission rate permission RG1 for transmission and scheduling instruction information to the multiplexing unit 508.
Multiplexing section 508 generates the supplied RG1 and scheduling instruction information as a DSACCH 107 signal and outputs the signal to transmitting section 503.
Next, in step ST706, RG1 and scheduling instruction information are notified to mobile station 102 via antenna 501.
In step ST607, the mobile station 102 monitors reception of ASS1 using the DSACCH 107.
When the DSACCH 107 radio frequency signal from the base station 103 is received via the antenna 409, the radio frequency signal is supplied to the receiving unit 410. The receiving unit 410 converts the supplied radio frequency signal into a baseband signal using a known technique, and supplies the baseband signal to the separation unit 411. The separation unit 411 separates the supplied baseband signal into signals for each channel using a known technique. The demultiplexing unit 411 extracts the transmission rate permission RG1 for transmission and scheduling instruction information (Scheduling assignment) from the demultiplexed DSACCH 107 signal, and supplies them to the packet transmission control unit 403.
The packet transmission control unit 403 of the mobile station 102 determines the transmission rate so that the amount of data that can be transmitted at a time is maximized at a rate equal to or lower than the transmission rate specified by the transmission rate permission for transmission RG1, and the data transmission control unit 421, multiplexing section 407, and transmission power control section 406 are controlled to transmit packet data to base station 103 in step ST609a and step ST609b.

Note that the processes of mobile station 102 and base station 103 in steps other than those described above are the same as those in the first embodiment.
As described above, according to the second embodiment, before the mobile station 102 receives the reception determination result of the base station 103 for the transmission data from the mobile station 102, the mobile station 102 transmits the next transmission data for transmission. A transmission rate change request is transmitted to the base station 103. As a result, as in Embodiment 1, it is possible to shorten the time until the next transmission data is transmitted to the base station 103. Also, the reception determination result for certain transmission data is NACK, and even if it is necessary to retransmit in the base station 103, it can be retransmitted quickly, and the delay time of the transmission process can be reduced.
In the second embodiment, the mobile station 102 transmits the transmission request information similar to that in the first embodiment together with the transmission transmission rate change request to the base station 103, but transmits only the transmission transmission rate change request. You may do it. The transmission rate change requests RR for transmission are transmitted one by one in correspondence with one transmission of DATA as shown in FIG. Therefore, even if only the transmission rate change request RR for transmission is transmitted to the base station 103, it is possible to notify the base station 103 that a transmission request has occurred.

In the second embodiment, the base station 103 transmits the same scheduling instruction information as in the first embodiment together with the transmission transmission rate permission. However, only the transmission transmission rate permission may be transmitted. Since the transmission rate permission RG for transmission is transmitted from the base station 103 in one-to-one correspondence with the transmission rate change request RR for transmission, the transmission timing is transmitted to the mobile station 102 even if only the transmission rate permission RG for transmission is transmitted. Can be notified.
In addition, the transmission interval of transmission requests may be shorter than that described in the related art (for example, 2 ms). In this case, it is possible to reduce the information amount of the transmission rate change request RR for transmission and the transmission rate permission RG for transmission in one transmission. For this reason, since the whole transmission cycle can be shortened with one transmission time, the transmission delay of the first time and retransmission data can be reduced.

Embodiment 3 FIG.
In the third embodiment, the first and second embodiments are applied to a parallel retransmission scheme (N channel stop and wait: N (natural number) is the number of divisions) which is an on-demind type channel allocation scheme. . Each channel used for data transmission / reception between the mobile station 102 and the base station 103 is periodically time-divisionally allocated to transmission / reception data, and data retransmission processing is performed independently in each allocation.
The specific value of N and the notification method are defined in the 3GPP standard specifications. The division number N is determined by the exchange of information among the base station control device 104, the base station 103, and the mobile station 102 during channel setting at the start of communication or during communication. In addition, the base station 103 may determine and notify it alone, or the base station 103 may determine within a range designated by the base station control device 104. The base station control device 104 may make a determination based on a request from the mobile station 102.

For example, in the case of the method of notifying the division number N from the base station controller 104 to the base station 103 and the mobile station 102, the exchange between the base station controller 104 and the base station 103 is called NBAP signaling in the 3GPP standard, and the 3GPP standard TS25. .430-TS25.435. Further, the exchange between the base station controller 104 and the mobile station 102 is called RRC signaling and is defined in the standard TS25.331.
Further, the mobile station 102 notifies the base station controller 104 of the capacity of the storage device such as the transmission data buffer 402, the maximum transmission rate, etc., and the base station controller 104 determines the value of N based on those values. Also good.
The control information notification described above can be performed using various channels defined in the 3GPP standard release 1999 version or various channels described in the first to third embodiments, but is not particularly limited here. In the release 1999 version, the standard TS25.211 defines various channels.

FIG. 12 is a block diagram showing a configuration of transmission data buffer 402 of mobile station 102 according to the third embodiment. As shown in the figure, the transmission data buffer 402 includes a data memory 1101 and a retransmission buffer 1102 (Stop & Wait buffer). The retransmission buffer 1102 includes a first selector 1103, retransmission memories 1104-1 to 1104 -N (N is a natural number), and a second selector 1105.
Next, data transmission / reception processing between mobile station 102 and base station 103 according to Embodiment 3 will be described.
FIG. 13 is a timing chart of packet data transmission / reception processing between the mobile station 102 and the base station 103. In the figure, the vertical axis represents each channel, and the horizontal axis represents time. An arrow (solid line) represents processing of the base station 103, and an arrow (broken line) represents processing of the mobile station 102.
First, the principle of operation in the case of performing parallel retransmission in the on-demind type channel assignment method will be described with reference to FIG.

Ch. 1-Ch. Reference numeral 3 denotes a transmission frame of each channel that is time-divided. Here, the time division number N is 3 and the subframe time length is 2 ms. Each data is sequentially transmitted and received in subframe units. Here, the division number N is equal to Ch. Before the mobile station 102 completes reception of the reception determination result ACK1 from the base station 103 for the transmission request REQ1 assigned to 1, it is determined that transmission of the next transmission request REQ2 is started.
In the figure, REQ1 to REQ3 are Ch. 1-Ch. The transmission requests ASS1 to ASS3 that are transmitted by using the DS. 1-Ch. 3, scheduling instruction information DATA1 to DATA3 transmitted using the E.CH. 1-Ch. 3, packet data ACK 1 to ACK 3 transmitted using the DANCCH 110 Ch. 1-Ch. 3 represents reception determination result information transmitted using 3. REQ, ASS, DATA, and ACK have the same information as REQ, ASS, DATA, and ACK in the first embodiment. Note that although modulation scheme information transmitted from the mobile station 102 using the UTCCH 108 is not shown, it is assumed to be transmitted at the same time as DATA1 to DATA3 or partially in advance.

FIG. 14 is a flowchart of packet data transmission / reception processing between the mobile station 102 and the base station 103 according to the third embodiment.
In FIG. 14, steps for performing the same processing as in the first embodiment are indicated by the same numbers as in FIG. The transmission / reception processing in each transmission cycle time-divided into N pieces is almost the same as the transmission / reception processing in the first embodiment. The processing contents differ from those of the first embodiment are the determination of the cycle identification number (Ch. 1 to Ch. 3) in step ST820 of the mobile station 102 and the processing inside the transmission data buffer 402.
Here, the operation of the transmission data buffer 402 according to the third embodiment will be described.
When packet data (Data) is input from the host processing unit 401, the transmission data buffer 402 temporarily stores the packet data (Data) in the data memory 1101.
The data memory 1101 updates the transmission data size (Queue size) held inside based on the data size of the input packet data (Data), and outputs it to the packet transmission control unit 403.

Next, the data memory 1101 divides the held packet data (Data) based on transmission data size (Block size) information in one transmission included in the input modulation scheme information (TRFI). To the first selector 1103.
The first selector 1103 transfers packet data input from the data memory 1101 to the retransmission memories 1104-1 to 1104-N based on transmission timing (TX timing) information input from the packet transmission control unit 403. Assign and output.
Retransmission memories 1104-1 to 1104-N store assigned packet data.
Based on the transmission timing (TX timing) supplied from the packet transmission control unit 403, the second selector 1105 is a retransmission memory 1104-1-1104-1 in which packet data (Data) to be transmitted is stored. 1104-N is selected, and the time division data (EUDCH TX data) stored in the retransmission memory is output to the multiplexing unit 407.

The first selector 1103 is time-divisionally input from the data memory 1101 based on the transmission timing (TX timing) input from the packet transmission control unit 403 simultaneously with the operation of the second selector 1105. One or more pieces of packet data are allocated to retransmission memories 1104-1 to 1104-N.
As shown in FIG. 13, a transmission request REQ1 is transmitted from the mobile station 102 to the base station 103, and then REQ2 and REQ3 are transmitted. The base station 103 receives the transmission request REQ1, creates scheduling instruction information ASS1 in the transmission scheduler 506, and notifies the mobile station 102 of it. Similarly, the base station 103 creates and transmits scheduling instruction information ASS2 and ASS3 for REQ2 and REQ3.
The mobile station 102 transmits DATA1 to the base station 103 according to the received ASS1. Similarly, DATA2 and DATA3 are transmitted according to ASS2 and ASS3.
After receiving DATA1, the base station 103 transmits a reception determination result ACK1 to the mobile station 102. Similarly, reception determination results ACK2 and ACK3 are transmitted after receiving DATA2 and DATA3.

Here, the mobile station 102 is connected to the channel ch. 1, before receiving the reception determination result ACK1 is completed, the same ch. Transmission of the next data REQ1 of 1 to the base station 103 is started.
As an initial state, each of the retransmission memories 1104-1 to 1104-N stores one piece of packet data by using time-division subframe length data as one unit.
As described above, according to the third embodiment, the next transmission timing in the same cycle is the time before the reception determination result for the data transmitted at a certain time-divided transmission timing is completed in the mobile station. Since the next transmission request is transmitted, the data transmission interval can be shortened in the parallel retransmission scheme. As a result, the reception determination result for certain data is NACK, and even if it is necessary to retransmit at the next assigned timing, it can be retransmitted quickly, and the delay time can be reduced.

Further, since the transmission interval of the transmission request is made shorter than the case described in relation to the prior art, the information amount of the transmission request REQ and the scheduling instruction information ASS in one transmission can be reduced. For this reason, since the whole transmission cycle can be shortened with one transmission time, the transmission delay of the first time and retransmission data can be reduced.
In the third embodiment, the data memory 1101 and the retransmission memories 1104-1 to 1104-N are separated, but they may be shared. In that case, instead of N, the size of the memory may be designated for each transmission cycle. The range of specific memory size values and notification methods are defined as 3GPP standard specifications, and the base station control device 104, the base station 103, and the mobile station when the channel is set at the start of communication or during communication It is specified by the exchange of information between the stations 102. For example, when notification is made from the base station controller 104 to the base station 103 and the mobile station 102, the exchange between the base station controller 104 and the base station 103 is called NBAP signaling in the 3GPP standard, and the standard document TS25.430-TS25. 435. The exchange between the base station controller 104 and the mobile station 102 is called RRC signaling and is defined in the standard document TS25.331.

As a method for determining the memory size, for example, the capacity value (capability described in the standard TS25.306) of a storage device such as a transmission buffer of the mobile station 102 is set at the start of communication (when a channel or the like is set). Other capability values (capability) notified from the mobile station 102, such as the maximum transmission rate, QoS (Quality Of Service: service type, minimum guaranteed transmission rate, etc.) ) Is also considered and determined.
Further, as in the second embodiment, a transmission transmission rate change request RR may be transmitted instead of the transmission request REQ, and a transmission transmission rate permission RG may be transmitted instead of the scheduling instruction information ASS. In this case, the same effect can be obtained.

Next, a first modification according to the third embodiment will be described.
FIG. 15 is a timing chart of data transmission / reception processing between the mobile station and the base station according to the first modification of the third embodiment. The first modification is also applied to the parallel retransmission scheme.
The difference from FIG. 13 is that the transmission requests REQ1 to REQ3 transmitted from the mobile station 102 are multiplexed by code multiplexing, and the individual transmission times of the transmission requests REQ1 to REQ3 are longer.
A series of transmission / reception operations are the same as those in the above embodiment shown in FIG.

FIG. 16 shows a channel multiplexing method according to the first modification. This shows a method of multiplexing various physical channels transmitted from the mobile station 102 to the base station 103 in the conventional W-CDMA standard (release 1999 version) and each channel according to the present invention.
This multiplexing process is performed in the multiplexing 407 of the mobile station 102.
In the figure, DPDCH _{1 to} DPDCH ₆ (Dedicated Physical Channel) are data channels, USICCH _{1 to} USICCH ₃ are channels for transmitting transmission requests REQ _{1 to} REQ ₃ , DPCCH (Dedicated Control Channel), and HS-DPCCH (High-Dated Rate). Control Channel) is a control channel, and EUDCH is a packet data transmission channel. Also, C _d is the spreading code for the DPDCH, C _c is the spreading code for the DPCCH, C _T1 ~C _T3 spread code respectively for USICCH ₁ ~USICCH _3, C _hs spread code for HS-DPCCH, C _eu Is a spreading code for EUDCH. Β _d is a signal amplitude coefficient for DPDCH, β _c is a signal amplitude coefficient for DPCCH, β _hs is a signal amplitude coefficient for HS-DPCCH, β _T is a signal amplitude coefficient for USICCH, and β _eu is for EUDCH. A signal amplitude coefficient S _{dpch, n} represents a mobile station identification scramble code. In each channel, channels other than those shown in the first embodiment correspond to channels of the conventional standard. The format of each channel is defined in the standard document TS25.211 and the multiplexing method is defined in the standard document TS25.213.

As shown in the figure, DPDCH ₁ , DPDCH ₃ , DPDCH ₅ and USICCH _{1 to} USICCH ₃ are assigned to the I axis of the complex signal (I + j * Q) after being multiplied by the spreading code and the amplitude coefficient for each channel. Is added by an I-axis adder (Σ).
On the other hand, DPDCH ₂ , DPDCH ₄ , DPDCH ₆ , DPCCH, HS-DPCCH, and EUDCH are added to the Q axis of the complex signal after being multiplied by the spreading code and amplitude coefficient for each channel. Add by (Σ).
The added DPDCH ₂ , DPDCH ₄ , DPDCH ₆ , DPCCH, HS-DPCCH, and EUDCH are multiplied by an imaginary number (j), added (IQ multiplexed) with the I-axis addition result, and handled as a complex signal.

The IQ-multiplexed complex signal is multiplied by a mobile station identification scramble code S _{dpch, n} in a multiplier, then output to the transmission unit 408, and transmitted to the base station 103 via the antenna 409. The mobile station identification scramble code S _{dpch, n} is a complex signal.
In the first modification, all channels are separated by different codes. However, time multiplexing and spreading codes such as time multiplexing of the channel according to the conventional standard and the channel of the present invention, time multiplexing of the channels according to the present invention, etc. May also be used.
Also, the conventional standard channel and the channel of the present invention may be partially used. For example, data may be transmitted using DPDCH, which is a conventional channel.

As described above, the transmission requests REQ1 to REQ3 in each time-divided retransmission cycle are code-multiplexed using different spreading codes, so that the data length of each transmission request REQ1 to REQ3 can be changed from the above-described third embodiment. Can also be long.
Further, since the transmission timing between transmission cycles is shifted, it is possible to reduce the peak of transmission power for the entire transmission processing from the mobile station 102 and to reduce interference with the base station 103 and other mobile stations. The throughput of the communication system can be improved.

Also, the number Ch. 1-Ch. Since the base station 103 can confirm the division number of the retransmission cycle in which each transmission request REQ1 to REQ3 is transmitted by the spreading code corresponding to 3, it is not necessary to send the identification number of the transmission cycle separately, and the number of transmission bits can be reduced. it can.
In the first modification, USICCH _{1 to} USICCH ₃ are multiplied by the same amplitude coefficient β _T , but the coefficient may be changed depending on, for example, initial transmission or retransmission.
Further, as in the second embodiment, a transmission transmission rate change request RR may be transmitted instead of the transmission request REQ, and a transmission transmission rate permission RG may be transmitted instead of the scheduling instruction information ASS. In this case, the same effect can be obtained.

Next, a second modification according to the third embodiment will be described.
FIG. 17 is a timing chart of data transmission / reception processing between the mobile station and the base station according to the second modification of the third embodiment. The second modification also corresponds to the parallel retransmission scheme.
The difference from FIG. 13 and FIG. 15 is that the data DATA1 to DATA3 transmitted from the mobile station 102 are multiplexed by code multiplexing, and the transmission time of each of DATA1 to DATA3 is increased.
A series of transmission / reception operations are the same as the operations shown in FIG.

FIG. 18 shows a channel multiplexing method according to the second modification. This shows a method of multiplexing various physical channels transmitted from the mobile station 102 to the base station 103 in the conventional W-CDMA standard (release 1999 version) and each channel according to the present invention.
This multiplexing process is performed in multiplexing section 407 of mobile station 102.
The difference from the first modification shown in FIG. 16 is that there is one transmission request channel USICCH, and three packet data transmission channels EUDCH are provided, EUDCH _{1 to} EUDCH _3. .
As described above, the data DATA1 to DATA3 in each time-divided retransmission cycle are code-multiplexed by separate spreading codes, so that the transmission times of the DATA1 to DATA3 can be lengthened.
Further, since the transmission timing between transmission cycles is shifted, it is possible to reduce the peak of transmission power for the entire transmission processing from the mobile station 102 and to reduce interference with the base station 103 and other mobile stations. The throughput of the communication system can be improved.

In addition, the identification number Ch. 1-Ch. Since the base station 103 can confirm the division number of the retransmission cycle in which DATA1 to DATA3 are transmitted by the spreading code corresponding to 3, it is not necessary to send the identification number of the transmission cycle separately, and the number of transmission bits can be reduced.
In the second modification, EUDCH _{1 to} EUDCH ₃ are multiplied by the same amplitude coefficient β _eu , but the coefficient may be changed depending on, for example, initial transmission or retransmission.

Further, as in the second embodiment, a transmission transmission rate change request RR may be transmitted instead of the transmission request REQ, and a transmission transmission rate permission RG may be transmitted instead of the scheduling instruction information ASS. In this case, the same effect can be obtained.
In the second modification, each channel is separated by a different code. However, time multiplexing such as time multiplexing of the channel according to the conventional standard and the channel of the present invention, time multiplexing of the channels according to the present invention, and spreading codes are performed. The code multiplexing by may also be used. Also, the conventional standard channel and the channel of the present invention may be partially used. For example, data may be transmitted using DPDCH, which is a conventional channel.

Next, a third modification according to the third embodiment will be described.
FIG. 19 is a timing chart of data transmission / reception processing between the mobile station and the base station according to the third modification of the third embodiment. The third modification also corresponds to the parallel retransmission scheme.
In the third modification, the time division number N is an even number (here, N = 4). A series of transmission / reception operations are the same as the operations shown in FIG.
FIG. 20 shows a channel multiplexing method according to the third modification. This shows a method of multiplexing various physical channels transmitted from the mobile station 102 to the base station 103 in the conventional W-CDMA standard (release 1999 version) and each channel according to the present invention.
This multiplexing process is performed in the multiplexing 407 of the mobile station 102.
The difference from FIG. 16 is that there is one transmission request channel USICCH, and the packet data transmission channel EUDCH is provided with EUDCH ₁ assigned to the Q axis and EUDCH ₂ assigned to the I axis. It is.

Note that EUDCH ₁ is assigned to DATA ₁ and DATA 3, and EUDCH ₂ is assigned to DATA 2 and DATA 4.
As described above, the data DATA1 to DATA4 in each time-divided retransmission cycle is IQ-multiplexed by separate axes, so that the transmission times of the DATA1 to DATA4 can be lengthened. Further, since the transmission timing between transmission cycles is shifted, it is possible to reduce the peak of transmission power for the entire transmission processing from the mobile station 102 and to reduce interference with the base station 103 and other mobile stations. The throughput of the communication system can be improved.
In the third modification, the data DATA1 and DATA3 are time-multiplexed on the Q axis, and the data 2 and DATA4 are time-multiplexed on the I axis, but may be code-multiplexed using different spreading codes on each axis. .

Also, the transmission requests REQ1 to REQ4 may be multiplexed separately on the I axis and the Q axis as in the case of DATA1 to DATA4.
Further, as in the second embodiment, a transmission transmission rate change request RR may be transmitted instead of the transmission request REQ, and a transmission transmission rate permission RG may be transmitted instead of the scheduling instruction information ASS. In this case, the same effect can be obtained.
In the third modified example, all the channels are separated by different codes. However, time multiplexing such as time multiplexing of the channel according to the conventional standard and the channel of the present invention, time multiplexing of the channels according to the present invention, and spreading code. The code multiplexing by may also be used. Also, the conventional standard channel and the channel of the present invention may be partially used. For example, data may be transmitted using DPDCH, which is a conventional channel.

Next, a fourth modification example according to the third embodiment will be described.
FIG. 21 is a timing chart of data transmission / reception processing between the mobile station and the base station according to the fourth modification example of the third embodiment. The third modification also corresponds to the parallel retransmission scheme. A series of transmission / reception operations are the same as the operations shown in FIG.
The difference from the first modification is that the scheduling instruction information ASS1 to ASS3 transmitted using the DSACCH 107 and the reception determination results ACK1 to ACK3 transmitted using the DANCCH 110 are time-multiplexed. Thereby, both channels can be transmitted using one spreading code. This multiplexing process is performed in the multiplexing unit 508 of the base station 103.
In the downlink from the base station 103 to the mobile station 102, a spreading code is used to separate transmission from the base station 103 to the mobile station 102 between the mobile stations. Since each mobile station 102 exists in large numbers within the communication range (cell) of the base station 103, the communication rate may be limited by the number of spreading codes.

As in the fourth modification, DSACCH 107 and DANCCH 110, which are downlink channels, are time-multiplexed and transmitted using the same spreading code, so that an increase in the number of used codes can be suppressed. Can be suppressed.
In Embodiment 1 or Embodiment 2 as well, the same effect can be obtained by time-multiplexing the downlink channels DSACCH 107 and DANCCH 110 as in the fourth modification.
In the third embodiment, all the transmission timings of the N transmission cycles that have been time-divided are allocated to one mobile station 102. For example, a set of a plurality of specific mobile stations 102 (the method of assembling is changed). It is also possible to designate a certain cycle and time-multiplex the transmission data of the plurality of mobile stations 102.

In this case, the specific allocation range and the notification method thereof are defined as 3GPP standard specifications, and the base station control device 104, the base station, or the like at the time of setting a channel or the like at the start of communication or during communication 103, specified by the exchange of information between the mobile stations 102. For example, when notification is made from the base station controller 104 to the base station 103 and the mobile station 102, the exchange between the base station controller 104 and the base station 103 is called NBAP signaling in the 3GPP standard, and the standard document TS25.430-TS25. 435. Further, the exchange between the base station controller 104 and the mobile station 102 is called RRC signaling and is defined in the standard document TS25.331.
In addition, as an allocation determination method, for example, the capacity value (Capability) of a storage device such as a transmission buffer of the mobile station 102 is notified to the base station control device 104 at the start of communication (at the time of setting a channel, etc.) There is a method in which the station control device 104 determines in consideration of other capability values (capabilities) notified from the mobile station 102, for example, the maximum transmission rate.

In addition, a method in which the base station 103 determines and notifies the base station 103 alone, a method in which the base station 103 determines within a range designated by the base station control device 104, and a base station control device 104 based on a request from the mobile station 103 The method specified by can be used.
In addition, the above-described exchange of control information can be performed using various channels defined in the 3GPP standard release 1999 version or various channels described in the first to third embodiments, but is not particularly limited here. In the release 1999 version, the standard TS25.211 defines various channels.
In the third embodiment, when the packet data from the mobile station 102 needs to be retransmitted, the retransmission scheduling instruction information ASS (re) is sent from the base station 103 to the mobile station 102 as in the first embodiment. Sent to. Or, when the modulation method of the retransmitted packet data is the same as that at the first transmission, or when it is determined that the retransmission data is always transmitted at the next transmission timing, the scheduling instruction information for retransmission ASS (re) transmission may not be performed. In this case, since communication interference with other mobile stations 102 and base station 103 can be reduced, the total throughput viewed from the base station 103 can be improved. In addition, since the power consumption of the mobile station 102 can be reduced, there is an effect that the communication time of the mobile station 102 can be extended.

As described above, the mobile station according to the present invention is suitable for reducing the delay time generated by retransmission of packet data.
Further, the base station according to the present invention is suitable for reducing the delay time generated by retransmission of packet data.
In addition, the communication system according to the present invention is suitable for reducing a delay time generated by retransmission of packet data.

Claims (1)

When there is data to be transmitted from the mobile station to the base station, a request step for transmitting a signal for requesting data transmission from the mobile station to the base station;
When receiving the signal requesting data transmission, an instruction step of transmitting a signal for instructing data transmission from the base station to the mobile station;
A data transmission step of transmitting the data to be transmitted from a mobile station to a base station when receiving a signal instructing the data transmission;
A retransmission instruction step of transmitting a signal indicating whether or not to retransmit the transmitted data from a base station to a mobile station,
A communication method with a variable modulation method,
When a signal indicating that retransmission is to be performed is transmitted in the retransmission instruction step, the data is retransmitted from the mobile station to the base station using the same modulation scheme used for the data transmission. Communication method .

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