JP2005311882A - Communication terminal device and transmission method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce transmission delay and to efficiently run a system. <P>SOLUTION: A MAC section 107 selects a TFC with the combination of transmission rates of channels which can be transmitted by predetermined transmission power, on the basis of results of determination in the case of first transmission and re-transmission, transmission data amount information indicating the amount of data desired to transmit for each channel, the information of priority for each TrCH and priority that is different in the case of first transmission and re-transmission, and information of transmission power of an up line. In the TrcH which performs HARQ in such a case, the priority that is different in the case of first transmission and re-transmission is designated from an RRC section 106 to the same TrCH. The MAC section 107 then outputs transmission data to an encoding section 112 if the TrCH performs HARQ, and outputs the transmission data to an encoding section 108 if it is set that the TrCH does not perform HARQ. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a communication terminal apparatus and a transmission method, and more particularly to a communication terminal apparatus and a transmission method applied to a system that performs scheduling on an uplink.

  A high-speed packet transmission method called HSDPA (High-Speed Downlink Packet Access) is known as a technique for transmitting packet data on the downlink in the WCDMA (Wideband Code Division Multiple Access) method. In addition, the standardization organization 3GPP is proceeding with a study on high speed and low delay of packet transmission on the uplink called Uplink Enhancement or High-Speed Uplink Packet Access (HSUPA).

  In the uplink of a wireless communication system, when the total transmission power of the communication terminal device exceeds the maximum transmission power, control such as stopping transmission of one of the channels or lowering the transmission rate is performed. It is necessary not to exceed the maximum transmission power. As a method for realizing this, Transport Format Combination Selection (hereinafter referred to as “TFC selection”) is known (for example, Non-Patent Document 1).

  In TFC selection, when a communication terminal apparatus multiplexes and transmits data on a plurality of DCHs (individual channels), it is a transport format that is a combination of transport formats indicating the amount of data transmitted on each DCH. For each combination (Transport Format Combination: hereinafter abbreviated as “TFC”), it is determined whether or not the total transmission power exceeds the maximum transmission power, and a transmittable TFC is selected.

The total transmission power may be limited depending on the capability of the communication terminal itself, or may be limited by a network device such as a base station issuing a command for temporarily limiting the transmission power of the communication terminal to the communication terminal. . The amount of uplink interference can be controlled by a network device such as a base station controlling the transmission rate of each communication terminal device on the uplink or the total transmission power of each communication terminal device. In a system such as a CDMA uplink where the same frequency is shared by a plurality of communication terminals, the amount of uplink interference determines the capacity of the system. Therefore, on the uplink, a network device such as a base station performs a scheduling operation that concentrates allocation to communication terminal devices with good propagation conditions and does not allocate communication terminal devices with poor propagation conditions as much as possible. Thus, the amount of uplink interference can be controlled, and the system can mainly use a state with good propagation conditions. Thereby, the system capacity can be improved.
3GPP TS25.133 v5.9.0 section6.4 Transport format combination selection in UE

  However, the conventional communication terminal apparatus and transmission method have a problem that high-quality transmission cannot be performed when an error occurs. In order to enable high-quality transmission, an automatic retransmission request method can be considered when an error occurs.

  In the automatic retransmission request, the transmission side and the reception side are connected by a bidirectional transmission path, and the transmission side first sends a packet including a code word generated by performing error detection encoding to the information bits to the reception side. Perform error detection. If no error is detected in the received data, the receiving side returns a reception confirmation signal Ack (Positive Acknowledgment) indicating that the data has been correctly received to the transmitting side, and if an error is detected in the received data, the retransmission request signal Nack ( Return Negative Acknowledgment) to the sender. When the transmitting side receives Nack, it retransmits the same packet. The transmission side repeats retransmission of the same packet until Ack is received. However, in the automatic retransmission request, there are problems that the transmission delay increases by repeating the retransmission and the efficiency of the entire system deteriorates. In particular, when the propagation environment is poor, there is a problem that the data error rate is high, so that the number of retransmissions increases and the transmission delay increases rapidly.

  Further, in the conventional communication terminal apparatus and transmission method, since the amount of data that can be transmitted is limited in the communication terminal apparatus in which the transmission power in the uplink is limited by the base station apparatus, such transmission power is limited. The communication terminal device has a problem that it cannot transmit transmission data efficiently. Also, in the conventional communication terminal apparatus and transmission method, the amount of data that can be transmitted is limited for communication terminal apparatuses that exist at cell boundaries and whose transmission power in the uplink is near the limit of the transmission capability of the mobile station. Therefore, there is a problem that such a communication terminal device with limited transmission power cannot transmit transmission data efficiently.

  The present invention has been made in view of this point, and provides a communication terminal apparatus and a transmission method capable of reducing transmission delay and performing efficient system operation in a system for transmitting a plurality of channels. For the purpose.

  The communication terminal apparatus according to the present invention is configured to perform retransmission at the time of retransmission for correcting transmission data at the time of initial transmission or an error in the transmission data based on a priority order at the time of initial transmission and at the time of retransmission. A transmission rate setting means for variably setting a data transmission rate for each channel, and combining the transmission data or the retransmission data of the transmission rate set by the transmission rate setting means between the channels, A configuration is provided that includes a synthesizing unit that generates and a transmitting unit that transmits the combined transmission data generated by the synthesizing unit.

  According to this configuration, the transmission rate of the transmission data at the time of the first transmission or the retransmission data at the time of retransmission is set variably for each channel based on the priority order at the time of the first transmission and at the time of retransmission. The transmission delay due to the transmission can be reduced, and the transmission rate of each channel can be variably set depending on the communication environment or the like, so that efficient system operation can be performed.

  The communication terminal apparatus according to the present invention employs a configuration in which the transmission rate setting means variably sets the transmission rate of the transmission data or the retransmission data of each channel based on the priority for each channel.

  According to this configuration, in addition to the above effects, the transmission rate can be made variable based on the priority at the time of initial transmission or retransmission and the priority of the channel, so that more efficient system operation is performed. be able to.

  In the communication terminal device according to the present invention, in the above configuration, the transmission rate setting means sets a plurality of transmission rates for each channel and selects one of the set transmission rates for each channel and combines the transmission rate information. The transmission rate information is a table storing the transmission rate information, and the transmission rate information is referred to by using the priority information for each channel notified from the communication partner. The transmission rate is set by selecting such a combination of transmission rates.

  According to this configuration, in addition to the above effects, the transmission rate can be set using transmission rate information common to the communication partner stored in advance, so the transmission rate can be set by a simple method. Can do.

  The communication terminal apparatus according to the present invention employs a configuration in which, in the configuration, the transmission rate setting means sets a transmission rate on the assumption that a channel transmitting transmission data with a short allowable delay time has a higher priority.

  According to this configuration, in addition to the above-described effect, the transmission rate can be increased for a channel that transmits transmission data with a short allowable delay time such as voice data, so that transmission data with a short allowable delay time can be transmitted. The delay time can be shortened. Further, for example, a channel for transmitting transmission data having a long allowable delay time such as FTP can be transferred with a sufficient time in the system, so that the efficiency of the system can be increased.

  The communication terminal device of the present invention, in the above configuration, the transmission rate setting means includes a table storing transmission rate selection information that associates the first transmission time and the retransmission time with priority, Using the information on whether or not the retransmission data is included in the combined transmission data, referring to the transmission rate selection information, the transmission data at the time of the first transmission having the low priority or the retransmission time A configuration is adopted in which the transmission rate is set so that the transmission rate becomes lower as the retransmission data.

  According to this configuration, in addition to the above effects, the transmission rate can be set using the first transmission rate selection information common to the communication partner stored in advance. Can be set.

  The communication terminal device according to the present invention employs a configuration in which, in the configuration, the transmission rate setting means sets a different transmission rate for each retransmission for the retransmission data.

  According to this configuration, in addition to the above-described effect, a different transmission rate is set for each retransmission, so that efficient operation can be performed in the entire system to which the retransmission method is applied.

  A base station apparatus of the present invention is a base station apparatus that receives the combined transmission data transmitted from any of the communication terminal apparatuses described above, wherein the base station apparatus is set by the transmission rate setting means Channel separation means for separating the combined transmission data into data of each channel based on the transmission rate information of the transmitted data of each channel or the retransmission data, and the data separated by the channel separation means In the case where there is retransmission data, a configuration is provided that includes decoding means for performing error correction on the previously received data with the retransmission data and decoding.

  According to this configuration, since the composite transmission data of the transmission rate that is variably set by the communication terminal apparatus is received and decoded, the reception data can be efficiently decoded.

  The base station apparatus of the present invention, in the above configuration, sets a plurality of transmission rates for each channel, selects one transmission rate for each channel, combines the transmission rate information, and combines the transmission rate information. Storage means comprising a table that stores channel separation information that is the same information as the information referred to when setting the transmission rate at the transmission rate, and the channel separation means transmits the transmission sent from the communication terminal device A configuration in which the combined transmission data is separated into data of each channel by referring to the channel separation information stored in the storage means, using the transmission rate information of each channel set by the rate setting means. take.

  According to this configuration, in addition to the above effect, since the received data is separated by the channel separation information that is the same information as the information used when setting the transmission rate in the communication terminal device stored in advance, a simple method Efficient system management.

  According to the transmission rate setting method of the present invention, the transmission data at the time of the first transmission and the error at the time of the retransmission for correcting the transmission data error at the communication partner based on the priority order at the time of the first transmission and the time of the retransmission. The transmission rate of retransmission data is variably set for each channel.

  According to this method, since the transmission rate of the transmission data at the time of the first transmission or the retransmission data at the time of retransmission is set variably for each channel based on the priority order at the time of the first transmission and at the time of retransmission, retransmission is repeated. The transmission delay due to the transmission can be reduced, and the transmission rate of each channel can be variably set depending on the communication environment or the like, so that efficient system operation can be performed.

  The transmission rate setting method of the present invention comprises a table storing transmission rate selection information that associates priorities with the first transmission time and the retransmission time in the method, and whether to transmit retransmission data. The transmission rate is set so that the transmission rate becomes lower as the transmission data at the time of the first transmission or the retransmission data at the time of the retransmission having a lower priority with reference to the transmission rate selection information. Was set.

  According to this method, in addition to the above effect, the transmission rate can be set using the first transmission rate selection information common to the communication partner stored in advance, so that the transmission rate can be set by a simple method. Can be set.

  According to the transmission method of the present invention, the transmission data at the time of the first transmission or the retransmission data at the time of the retransmission for correcting an error in the transmission data at the communication partner based on the priority order at the time of the first transmission and at the time of retransmission. The transmission rate of each channel is variably set, the transmission data of the set transmission rate or the retransmission data is combined between the channels to generate combined transmission data, and the generated combined transmission And a step of transmitting data.

  According to this method, since the transmission rate of the transmission data at the time of the first transmission or the retransmission data at the time of retransmission is set variably for each channel based on the priority order at the time of the first transmission and at the time of retransmission, retransmission is repeated. The transmission delay due to the transmission can be reduced, and the transmission rate of each channel can be variably set depending on the communication environment or the like, so that efficient system operation can be performed.

  In the transmission method of the present invention, in the method, the transmission rate of the transmission data or the retransmission data of each channel is variably set based on the priority for each channel.

  According to this method, in addition to the above effects, the transmission rate can be made variable based on the priority at the time of initial transmission or retransmission and the priority of the channel, so that the system can be operated more efficiently. be able to.

  In the transmission method of the present invention, in the method, a plurality of transmission rates are set for each channel, and one set transmission rate is selected for each channel, and transmission rate information that is a combination of transmission rates is stored. Comprising a table, referring to the transmission rate information using the priority information for each channel notified from the communication partner, a combination of transmission rates such that the transmission rate becomes lower as the channel has a lower priority Selected to set the transmission rate.

  According to this method, in addition to the above effects, the transmission rate can be set using transmission rate information common to the communication partner stored in advance, so the transmission rate can be set by a simple method. Can do.

  In the transmission method of the present invention, in the method, the transmission rate is set such that a channel transmitting transmission data with a short allowable delay time has a higher priority.

  According to this method, in addition to the above-described effect, the transmission rate of a channel that transmits transmission data with a short allowable delay time, such as voice data, can be increased. The delay time can be shortened. Further, for example, a channel that transmits transmission data having a long allowable delay time, such as FTP, can be transferred with a sufficient time in the system, so that the efficiency of the system can be increased.

  The transmission method of the present invention includes a table storing transmission rate selection information in which the priority is associated with the first transmission time and the retransmission time in the method, and the retransmission data is included in the combined transmission data. The transmission rate at the first transmission or the retransmission data at the time of retransmission having a lower priority is referred to the transmission rate selection information, and the transmission rate is lower. The transmission rate was set so that

  According to this method, in addition to the above effect, the transmission rate can be set using the first transmission rate selection information common to the communication partner stored in advance, so that the transmission rate can be set by a simple method. Can be set.

  In the transmission method of the present invention, a different transmission rate is set for each retransmission for the retransmission data in the method.

  According to this method, in addition to the above effects, a different transmission rate is set for each retransmission, so that efficient operation can be performed in the entire system to which the retransmission method is applied.

  According to the communication method of the present invention, the transmission data at the time of the first transmission or the retransmission data at the time of the retransmission for correcting an error in the transmission data at the communication partner based on the priority order at the time of the first transmission and at the time of retransmission. The transmission rate of each channel is variably set, the transmission data of the set transmission rate or the retransmission data is combined between the channels to generate combined transmission data, and the generated combined transmission Transmitting the data; receiving the combined transmission data; and transmitting the combined transmission data of each channel based on information on the transmission data of each channel set on the transmission side or the transmission rate of the retransmission data. Separating the data, and if there is the retransmission data in the separated data, the retransmission is performed on the previously received data. And so it includes the step of decoding by the error correction, the the data.

  According to this method, since the transmission rate of the transmission data at the time of the first transmission or the retransmission data at the time of retransmission is set variably for each channel based on the priority order at the time of the first transmission and at the time of retransmission, retransmission is repeated. The transmission delay due to the transmission can be reduced, and the transmission rate of each channel can be variably set depending on the communication environment or the like, so that efficient system operation can be performed.

  According to the present invention, in a system that transmits a plurality of channels, transmission delay can be reduced and efficient system operation can be performed.

  The gist of the present invention is to use HARQ as a retransmission method, and to retransmit the transmission data at the first transmission or an error in the transmission data at the communication partner based on the priority order at the first transmission and the retransmission. The transmission rate of retransmission data at that time is variably set for each channel.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment)
FIG. 1 is a block diagram showing a configuration of communication terminal apparatus 100 according to the embodiment of the present invention. In the present embodiment, a case will be described in which transmission data is transmitted using transport channel (hereinafter referred to as “TrCH”) 1, TrCH2, and TrCH3.

  Antenna 101 transmits transmission data output from switching section 102 to a base station apparatus to be described later, receives data transmitted from the base station apparatus, and outputs the data to switching section 102.

  The switching unit 102 outputs transmission data input from the transmission RF unit 119 to the antenna 101 during transmission, and outputs reception data input from the antenna 101 to the reception RF unit 103 during reception.

  Reception RF section 103 down-converts the reception data input from switching section 102 from a radio frequency to a baseband frequency and outputs the result to despreading section 104.

  Despreading section 104 despreads the received data input from reception RF section 103 using a predetermined spreading code, and outputs the result to demodulation section 105.

  Demodulation section 105 demodulates the received data input from despreading section 104 and outputs the demodulated data to RRC section 106 and MAC section 107.

  The RRC unit 106 uses the reception data input from the demodulation unit 105 to transmit rate selection information, which is information indicating the priority in each channel and the first transmission between channels, and a plurality of transmissions for each channel. A rate is set and one of the set transmission rates is selected for each channel, and TFC selection information (transmission rate information), which is information of the combined transmission rates, is extracted and output to the MAC unit 107.

  The MAC unit 107 serving as a transmission rate setting unit extracts an Ack signal or a Nack signal from the received data input from the demodulating unit 105, and performs determination at the time of initial transmission and retransmission, or determination of the number of retransmissions. The MAC unit 107 includes a determination result of initial transmission and retransmission or the number of retransmissions, transmission data amount information indicating the amount of data desired to be transmitted on each channel, transmission rate selection information input from the RRC unit 106, an RRC unit Based on the TFC selection information input from 106 and the transmission power information that is information on the measurement result of the uplink transmission power input from the transmission RF unit 119, which will be described later, at a predetermined transmission power that is less than or equal to the allowable maximum transmission power. A TFC of a combination of transmission rates of each channel that can be transmitted is selected. Then, the MAC unit 107 outputs transmission data at the set transmission rate to the encoding unit 112 when the TrCH is not set to perform HARQ, and sets when TrCH is set to perform HARQ. The transmission data at the transmission rate is output to the encoding unit 108. Further, the MAC unit 107 outputs TFC selection information that is information of the selected TFC to the TFC information generation unit 115. Further, the MAC unit 107 controls the HARQ control unit 111 so as not to exceed the transmission rate in the selected TFC. Details of the MAC unit 107 will be described later.

  Encoding section 108 encodes the transmission data input from MAC section 107 and outputs the encoded transmission data to interleaving section 109.

  Interleaving section 109 rearranges the transmission data input from encoding section 108 in a predetermined pattern, and outputs it to rate matching section 110.

  The rate matching unit 110 performs processing for thinning out data in bit units or processing for adding data in bit units so that transmission data input from the interleaving unit 109 fits in one frame, and outputs the result to the HARQ control unit 111.

  The HARQ unit 111 selects and combines the transmission data input from the rate matching unit 110 as parity bit data within a range not exceeding the TFC transmission rate selected by the MAC unit 107 under the control of the MAC unit 107. To the unit 116.

  Encoding section 112 encodes transmission data input from MAC section 107 and outputs the encoded transmission data to interleaving section 113.

  The interleaving unit 113 rearranges the transmission data input from the encoding unit 112 in a predetermined pattern and outputs the rearranged data to the rate matching unit 114.

  The rate matching unit 114 performs processing for thinning out data in bit units so that transmission data input from the interleaving unit 113 fits in one frame, or performs retransmission (repetition) of data within the same transmission times as much as necessary. The frame is filled and output to the combining unit 116. Note that retransmission within the same transmission round is referred to as retransmission, and retransmission at different transmission rounds after receiving a NACK is also referred to as retransmission. Refers to transmission. In the case of repetition, it is described as retransmission (repetition).

  The TFC information generation unit 115 performs processing for including the TFC information input from the MAC unit 107 in the transmission data, and outputs the transmission data to the combining unit 116.

  The combining unit 116 combines the transmission data at the time of retransmission input from the HARQ control unit 111 and the transmission data at the time of the first transmission input from the rate matching unit 114, and includes the TFC information input from the TFC information generation unit 115. It outputs to the modulation part 117 as transmission data.

  Modulating section 117 modulates the transmission data input from combining section 116 and outputs the modulated transmission data to spreading section 118.

  Spreading section 118 spreads the transmission data input from modulation section 117 with a predetermined spreading code and outputs the result to transmission RF section 119.

  The transmission RF unit 119 up-converts the transmission data input from the spreading unit 118 from the baseband frequency to the radio frequency and amplifies the transmission data to a predetermined power and outputs it to the switching unit 102. Also, the transmission RF unit 119 outputs transmission power information, which is information on the transmission power of the amplified transmission data, to the MAC unit 107.

  Next, the configuration of base station apparatus 200 will be described using FIG. FIG. 2 is a block diagram showing a configuration of base station apparatus 200.

  The antenna 201 receives data transmitted from the communication terminal apparatus 100 and outputs the data to the reception RF unit 202.

  The reception RF unit 202 down-converts reception data input from the antenna 201 from a radio frequency to a baseband frequency and outputs the down-converted unit 203 to the despreading unit 203.

  Despreading section 203 despreads the received data input from reception RF section 202 with the same spreading code as the spreading code used in the spreading process, and outputs the result to rake receiving section 204.

  The rake reception unit 204 rake-combines the reception data input from the despreading unit 203 and outputs the resultant to the separation unit 206.

  The TFC determination unit 205 sets a plurality of transmission rates for each channel, instructed by, for example, a control station that is a higher-level station of the base station apparatus 200, and selects one transmission rate for each channel and combines them. A table storing channel separation information that is transmission rate information is stored. Then, the TFC determination unit 205 outputs information on the transmission rate of each channel in accordance with TFC information included in the reception data input from the rake reception unit 204 to the separation unit 206 to the separation unit 206. The TFC selection information and the channel separation information are the same information.

  Separation section 206, which is a channel separation means, extracts TFC information contained in the received data input from rake reception section 204, and uses the extracted TFC information to obtain channel separation information stored in TFC determination section 205. The transmission rate of each channel is selected with reference. Then, separation section 206 separates the received data into received data for each channel according to the selected transmission rate for each channel. Then, in the case of a channel for which HARQ is not set, demultiplexing section 206 outputs the separated received data to rate dematching section 212, and in the case of a channel for which HARQ is set, the demultiplexed received data is output as a rate. Output to the dematching unit 207.

  The rate dematching unit 207 performs a process of adding a value corresponding to the intermediate value to the data thinned out at the time of transmission with respect to the received data input from the separation unit 206, The retransmitted data is output to the deinterleaver 208 after adjusting the number of data by combining the retransmitted data.

  The deinterleaving unit 208 rearranges the received data input from the rate dematching unit 207 so as to return to the initial array, and outputs the rearranged data to the storage unit 209 and the adder 210.

  The storage unit 209 stores the reception data input from the deinterleave unit 208. When information indicating that retransmission has been requested is input from the error correction decoding unit 211 because an error has occurred in the received data, the storage unit 209 stores the stored received data in which the error has occurred at a predetermined timing. To the adder 210. Further, the storage unit 209 does not output to the adder 210 when the information indicating that the retransmission request is received from the error correction decoding unit 211 is not input.

  Adder 210 adds the received data that is retransmission data input from deinterleaver 208 and the received data input from storage unit 210, and outputs the result to error correction decoding unit 211.

  The error correction decoding unit 211 corrects and decodes the received data input from the adder 210 and outputs it as received data.

  The rate dematching unit 212 performs processing for adding the data thinned out at the time of transmission to the received data input from the separation unit 206 or processing for thinning out the data added at the time of transmission, and outputs the result to the deinterleaving unit 213.

  The deinterleaving unit 213 rearranges the received data input from the rate dematching unit 212 so as to return to the initial arrangement, and outputs the rearranged data to the error correction decoding unit 214.

  Error correction decoding section 214 corrects the received data input from deinterleave section 213, decodes it, and outputs it as received data.

  Next, details of the configuration of the MAC unit 107 will be described with reference to FIG. FIG. 3 is a block diagram showing the configuration of the MAC unit 107.

  The determination unit 301 refers to the TFC selection information stored in the storage unit 302 using the transmission power information input from the transmission RF unit 119, so that the transmission power is equal to or lower than the allowable maximum transmission power and the transmission power information. A TFC of a combination of transmission rates of each channel that can be transmitted with a predetermined transmission power is searched. Then, as a result of the search, the determination unit 301 selects a TFC that has a transmission power that is equal to or lower than the allowable maximum transmission power and that can be transmitted at a predetermined transmission power, and that transmits information about the selected TFC to the TFC. The data is output to the selection unit 303. Note that the maximum allowable transmission power is stored in advance by the determination unit 301. In addition, the TFC selected by the determination unit 301 may be one or more.

  The storage unit 302 stores TFC selection information input from the RRC unit 106 after being transmitted from the base station apparatus 200 in advance and extracted by the RRC unit 106, and transmission that is less than or equal to the allowable maximum transmission power by the search of the determination unit 301. The TFC information of the combination of the transmission rates of the respective channels that can be transmitted with the power and the predetermined transmission power is output to the determination unit 301.

  The TFC selection unit 303 outputs the transmission data of each channel to the encoding unit 108 or the encoding unit 112 so that the transmission data of each channel is transmitted at the selected TFC transmission rate, and outputs it to the transmission completion waiting data holding unit 304 . Also, the TFC selection unit 303 selects one TFC from the TFC information input from the determination unit 301 based on the priority order of the transmission rate selection information input from the RRC unit 106. At this time, the TFC selection unit 303 determines that there is no retransmission data when the Ack signal is input from the demodulation unit 105 for all channels, and transmits retransmission data for the channel to which the Nack signal is input from the demodulation unit 105. The TFC is selected as what needs to be done. Further, the TFC selection unit 303 outputs the TFC information to the TFC information generation unit 115 and controls the HARQ control unit 111 so as not to exceed the transmission rate of the selected TFC.

  The transmission completion waiting data holding unit 304 temporarily holds the transmission data input from the TFC selection unit 303, and outputs the held transmission data to the TFC selection unit 303 when a Nack signal is input from the demodulation unit 105. When the Ack signal is input from the demodulator 105, the held transmission data is discarded.

  Next, operations of communication terminal apparatus 100 and base station apparatus 200 will be described. FIG. 4 is a diagram illustrating a communication system 400 using the communication terminal device 100 and the base station device 200. In FIG. 4, communication terminal apparatus 100 has the same configuration as in FIG. 1, and base station apparatus 200 has the same configuration as in FIG.

  First, the control station 401 generates, for example, TFC selection information illustrated in FIG. 5 and transmission rate selection information illustrated in FIG. 6 and transmits the generated information to the base station apparatus 200. For example, TrCH1 transmission data is voice data, TrCH2 transmission data is streaming type packet communication data, and TrCH3 transmission data is WWW access type packet communication data. As a result, the channel that transmits transmission data with a short allowable delay time has a higher priority, so that the voice data of TrCH1 is always sent with priority, and the streaming type packet communication data of TrCH2 is the WWW of TrCH3. It is sent with priority over access type packet communication data. Furthermore, with regard to the TrCH2 transmission data, the priority at the time of retransmission is higher than that at the time of the first transmission, so that erroneous data can be sent preferentially and QoS can be managed. ing. In this case, the voice data that is TrCH1 is less demanding on the error rate, but HARQ is not set because the demand on the delay time is particularly severe. In addition, the streaming type packet communication data that is TrCH2 is less demanding on the error rate, and the demand on the delay time is stricter than WWW access and looser than voice. The WWW access type that is TrCH3 has a strict requirement for the error rate and the weakest requirement for the delay time. Taking these into account, HARQ is set for TrCH2 and TrCH3. Here, an example of three TrCH is described, but it is not limited to three channels. In addition, the transmission rate selection information in FIG. 6 is a case where priorities are set at the time of the first transmission and at the time of retransmission. However, when retransmission is repeated, it is possible to set different priorities for each number of retransmissions. It is.

  Next, the base station apparatus 200 that has received the TFC selection information and the transmission rate selection information stores the TFC selection information as channel separation information in the TFC determination unit 205, and also uses the TFC selection information and the transmission rate selection information. Information is transmitted to communication terminal apparatus 100. Next, the communication terminal apparatus 100 that has received the TFC selection information and the transmission rate selection information extracts the TFC selection information and the transmission rate selection information by the RRC unit 106, and the TFC selection information by the MAC unit 107. Store information. The processing so far is performed before starting communication.

  Next, communication terminal apparatus 100 has a combination of transmission rates that can be transmitted at a predetermined transmission power of transmission power information that is equal to or less than the maximum allowable transmission power based on TFC selection information and transmission power information in MAC section 107. Select the TFC. For example, when transmission data amount information indicating that data transmission is to be performed on all channels is input and there is no retransmission data on any channel, the transmission power information is less than the maximum allowable transmission power and the predetermined transmission power information is transmitted. As the transmission rate of each channel that can be transmitted with power, when the total number of bits of TrCH1 to TrCH3 is 500 bits, the MAC unit 107 sets TFC = 2 as a TFC in which the total number of bits of TrCH1 to TrCH3 does not exceed 500 bits, Select TFC = 3, TFC = 4, TFC = 6 and TFC = 7. As a result, as shown in FIG. 7, the MAC unit 107 sets “Blocked state” indicating that transmission is prohibited when TFC = 1 and TFC = 5, and TFC = 2 to TFC = 4, TFC = 6, and TFC = 7. Sets each TFC to the state shown in FIG. 8 as “Supported state” indicating transmission permission. As described above, the communication terminal apparatus 100 uses the transmission power information for each slot of the communication terminal apparatus 100 to continuously apply the evaluation criteria of Elimination, Blocking, and Recovery for each TFC, thereby obtaining “Supported state”, State transition of “Excess-power state” and “Blocked state” is performed.

  Specifically, when the communication terminal device 100 transmits the selected TFC in, for example, 15 of 30 slots, if the transmission power exceeds the allowable maximum transmission power, the Elimination criterion is satisfied It will be judged and it will be in Excess-power state. In addition, after entering the Excess-power state, the Blocked state is entered after a certain period of time. The length required for the transition to the Blocked state is determined in consideration of the time required for changing the bit rate in the upper layer, the interleave length, and the signal transmission delay from the layer 1 to the upper layer. From the Blocked state, if the transmission power does not exceed the maximum transmission power allowed when transmitting a predetermined TFC continuously in the 30-slot period, it is determined that the Recovery criterion is satisfied, and the state transitions to the Supported state. To do.

  Next, the MAC unit 107 has the highest priority order of TrCH1 compared to the transmission rate selection information of FIG. 6, so the TFC = 2, TFC = 3, TFC = 4, TFC = 6 and TFC = 7 are selected. Select TFC = 2, TFC = 3, and TFC = 4 where the number of bits of TrCH1 is not 0. Next, since the transmission order of TrCH2 is higher in priority than the transmission data of TrCH3 than the transmission rate selection information of FIG. 6, the MAC unit 107 has the selected TFC = 2, TFC = 3, and TFC = 4. Select TFC = 2 from the inside. Thus, MAC section 107 outputs 100 bits as TrCH1 transmission data to encoding section 112, and outputs 200 bits as TrCH2 transmission data to encoding section 108. Combining section 116 combines the transmission data of TrCH1 and the transmission data of TrCH2. At this time, the transmission data of TrCH3 is 0.

  Next, when transmission data amount information to be transmitted on all channels is input, and retransmission data remains in TrCH2 and there is no retransmission data in TrCH1 and TrCH3, the transmission power is less than the maximum allowable transmission power. When the total number of bits of TrCH1 to TrCH3 is 500 bits as the transmission rate of each channel that can be transmitted with the predetermined transmission power of the transmission power information, TFC = 2 is selected in the same order as described above. Retransmission data is sent for TrCH2. Thereby, MAC section 107 outputs 100 bits as TrCH1 transmission data to encoding section 108, 200 bits as retransmission data of TrCH2 to encoding section 108, and combining section 116 transmits TrCh1 transmission data and TrCH2 Of the retransmitted data.

  At this time, in TrCH2, retransmission data is transmitted by HARQ, which is a method that combines error correction and retransmission. As HARQ, erroneous data is discarded on the receiving side, and retransmission data is decoded independently, and a combination process is not performed between the first data and the retransmission data. A method called Type 2 that is decoded and combined with additional redundant bits of retransmission data without being discarded on the receiving side, or a method called Type 3 that is the same as Type 2 but that can be decoded even with single retransmission data. Either method can be adopted. As another HARQ classification method, a method called Chase combining, in which the same data is transmitted in the initial transmission and retransmission, and the initial data and the retransmission data are combined on the receiving side, and then error correction decoding is performed. The part of or all of the parity bit data to be sent is different between the retransmission and the different part of the parity bit data on the receiving side is highly redundant, and the same part of the parity bit data is combined and error corrected. Either of the methods called Incremental redundancy to decrypt can be adopted. Incremental redundancy methods include a method that does not send systematic bit data and a method that sends systematic bits at the time of retransmission, and both methods can be applied.

  Next, when transmission data amount information for transmitting TrCH3 transmission data is input, and there is no retransmission request after transmitting TrCH1 and TrCH2 transmission data, there is no retransmission data for TrCH3. As the transmission rate of each channel that can be transmitted with the predetermined transmission power of the transmission power information, when the total number of bits of TrCH1 to TrCH3 is 400 bits, the MAC unit 107 has a total number of bits of TrCH1 to TrCH3 of 400 bits. TFC = 2, TFC = 4, TFC = 6 and TFC = 7 are selected as TFCs not exceeding. As a result, as shown in FIG. 7, MAC section 107 transitions TFC = 3 from “Supported state” to “Excess-power state” indicating immediately before transmission prohibition (step ST701), and from “Excess-power state”. The state is changed to “Blocked state” (step ST702), and TFC = 1, TFC = 3 and TFC = 5 are set to “Blocked state” indicating that transmission is prohibited, and TFC = 2, TFC = 4, TFC = 6 and TFC. = 7 is set to “Supported state” indicating transmission permission, and each TFC is set to the state shown in FIG. Next, the MAC unit 107 selects TFC = 6 having the largest number of bits of TrCH3 from the selected TFC = 2, TFC = 4, TFC = 6, and TFC = 7. Thereby, the MAC unit 107 outputs 400 bits as TrCH3 transmission data to the encoding unit 112.

  There are two ways of using HARQ. The first method is to lower the target BLER (block error rate) for the first transmission. This method basically allows data to pass through the first transmission. However, even if it is wrong, the retransmission data is sent immediately. By determining this retransmission data transmission at a lower layer such as layer 1, the time until retransmission can be shortened. As a result, the delay can be shortened, and a gain in a delay-sensitive type application can be obtained. Another method is to increase the target BLER for the first transmission. This method allows data to pass through multiple times. By increasing the target BLER in the initial transmission, it is possible to increase the coding rate of mobile device transmission power or transmission data. Even in such a case, data communication succeeds at a certain rate, and mobile device transmission power can be reduced by returning an Ack signal to the transmission side. Thereby, the radio wave utilization efficiency can be improved, and the bit rate can be improved when the coding rate is increased. As described above, it is possible to variably set the priority order at the time of the first transmission and retransmission, and the priority order for each channel, and adjust the target BLER to perform more efficient system operation.

  The communication system 400 and the communication terminal device 100 described above are EUDTCH (enhanced uplink DTCH system) or HSUPA (High Speed Uplink Packet Access; uplink), which is considered as an extension of the UMTS system (WCDMA system) on which the communication terminal device becomes the transmission side. High-speed transmission method).

  As described above, according to the present embodiment, since the transmission rate of the transmission data is set based on different priorities at the time of the first transmission and at the time of retransmission or the number of retransmissions, retransmission control is performed by the HARQ method. Transmission delay can be reduced and efficient system operation can be performed. Also, according to the present embodiment, scheduling is performed based on the priority order for each channel and retransmission control is performed by the HARQ method, so that more efficient system operation can be performed. Further, according to the present embodiment, in the case of data with a short allowable delay time such as voice data, for example, the priority in transmission is increased, so that retransmission of packet communication data other than voice data is not allowed. By repeating the preparation, it is possible to prevent a state in which the voice is interrupted on the receiving side due to uniform priority on transmission of retransmission data. Further, for example, a channel that transmits transmission data having a long allowable delay time, such as FTP, can be transferred with a sufficient time in the system, so that the efficiency of the system can be increased. Further, when the priority order is set in two cases of the first transmission time and the retransmission time, the process of determining the priority order when the communication terminal apparatus sets the transmission rate can be simplified. . In addition, when a different transmission rate is set for each retransmission, efficient operation can be performed in the entire system to which the retransmission method is applied.

  In the above embodiment, TrCH1 transmission data is voice data, TrCH2 transmission data is streaming type packet communication data, and TrCH3 transmission data is WWW access type packet communication data. Instead, priorities can be set as necessary for any type of data. In this embodiment, the present invention is applied to a CDMA system, but the present invention is not limited to this, and can be applied to any system other than a CDMA system. Further, in the present embodiment, HARQ is used as a retransmission scheme, but the present invention is not limited to this, and any retransmission scheme other than HARQ can be applied. Further, in the present embodiment, the priority information for each channel and the priority information at the time of initial transmission or retransmission are stored as one transmission rate selection information. The information may be stored as different information by dividing the priority information for each channel and the priority information at the time of initial transmission or retransmission.

  INDUSTRIAL APPLICABILITY The communication terminal device and the transmission method according to the present invention have the effect of reducing transmission delay and efficient system operation in a system that transmits multiple channels, and are useful for scheduling and transmitting data. .

The block diagram which shows the structure of the communication terminal device which concerns on embodiment of this invention The block diagram which shows the structure of the base station apparatus which concerns on embodiment of this invention The block diagram which shows the structure of the MAC part which concerns on embodiment of this invention The figure which shows the structure of the communication system which concerns on embodiment of this invention. The figure which shows the relationship between TFC and the transmission rate of each channel which concerns on embodiment of this invention The figure which shows the relationship between the time of the first transmission of each channel which concerns on embodiment of this invention, the time of retransmission, and a priority. The figure which shows the state transition which concerns on embodiment of this invention The figure which shows the state of each TFC which concerns on embodiment of this invention The figure which shows the state of each TFC which concerns on embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Communication terminal device 106 RRC part 107 MAC part 108,112 Coding part 109,113 Interleaving part 110,114 Rate matching part 111 HARQ control part 115 TFC information generation part 116 Synthesis | combination part 117 Modulation part 118 Spreading part 119 Transmission RF part

Claims (17)

Based on the priority order at the time of the first transmission and at the time of retransmission, the transmission data at the time of the first transmission or the transmission rate of the retransmission data at the time of retransmission for correcting an error in the transmission data at the communication partner is set for each channel. A transmission rate setting means for setting by variable;
Combining means for generating combined transmission data by combining the transmission data or the retransmission data of the transmission rate set by the transmission rate setting means between channels;
Transmitting means for transmitting the combined transmission data generated by the combining means;
A communication terminal apparatus comprising:   The communication terminal apparatus according to claim 1, wherein the transmission rate setting means variably sets the transmission rate of the transmission data or the retransmission data of each channel based on a priority for each channel.   The transmission rate setting means includes a table that stores a plurality of transmission rates for each channel and stores transmission rate information that is information on transmission rates obtained by selecting one transmission rate for each channel and combining the transmission rates. With reference to the transmission rate information using the priority information for each channel notified from the communication partner, a transmission rate combination is selected so that the transmission rate is lower as the channel has a lower priority. The communication terminal apparatus according to claim 2, wherein a rate is set.   4. The communication terminal apparatus according to claim 2, wherein the transmission rate setting means sets the transmission rate so that a channel transmitting transmission data having a shorter allowable delay time has a higher priority. .   The transmission rate setting means includes a table storing transmission rate selection information that associates priorities with the first transmission time and the retransmission time, and the combined transmission data includes the retransmission data. The transmission rate selection information is used to refer to the transmission rate selection information so that the transmission data at the time of the first transmission or the retransmission data at the time of retransmission having a lower priority is transmitted so that the transmission rate is lower. The communication terminal apparatus according to any one of claims 1 to 4, wherein a rate is set.   The communication terminal apparatus according to any one of claims 1 to 5, wherein the transmission rate setting means sets a different transmission rate for each retransmission with respect to the retransmission data. A base station apparatus that receives the combined transmission data transmitted from the communication terminal apparatus according to any one of claims 1 to 6,
The base station device
Channel separation means for separating the combined transmission data into data of each channel based on information on the transmission data of each channel set by the transmission rate setting means or the transmission rate of the retransmission data;
Decoding means for performing error correction with the retransmission data and decoding the previously received data when there is the retransmission data in the data separated by the channel separation means;
A base station apparatus comprising: Information for setting a plurality of transmission rates for each channel and selecting one transmission rate for each channel and combining them, and information to be referred to when setting the transmission rate by the transmission rate setting means Storage means comprising a table storing channel separation information, which is the same information as
The channel separation means refers to the channel separation information stored in the storage means by using the transmission rate information of each channel set by the transmission rate setting means sent from the communication terminal device. The base station apparatus according to claim 7, wherein the combined transmission data is separated into data of each channel.   Based on the priority order at the time of the first transmission and at the time of retransmission, the transmission data at the time of the first transmission or the transmission rate of the retransmission data at the time of retransmission for correcting an error in the transmission data at the communication partner is set for each channel. A transmission rate setting method, characterized by being set in a variable manner.   A table storing transmission rate selection information in which the first transmission time and the retransmission time are associated with each other and a priority order is provided, and information on whether or not to transmit retransmission data is used to select the transmission rate. The transmission rate is set so that the transmission rate is lower for the transmission data at the time of the first transmission or the retransmission data at the time of the retransmission, which is lower in the priority order with reference to information. Transmission rate setting method. Based on the priority order at the time of the first transmission and at the time of retransmission, the transmission data at the time of the first transmission or the transmission rate of the retransmission data at the time of retransmission for correcting an error in the transmission data at the communication partner is set for each channel. Variable setting step;
Combining the transmission data of the set transmission rate or the retransmission data between channels to generate combined transmission data;
Transmitting the generated composite transmission data;
The transmission method characterized by comprising.   12. The transmission method according to claim 11, wherein a transmission rate of the transmission data or the retransmission data of each channel is variably set based on a priority for each channel.   A plurality of transmission rates are set for each channel, and a table storing transmission rate information, which is transmission rate information obtained by selecting one transmission rate for each channel and combining the transmission rates, is notified from the communication partner. The transmission rate information is set by referring to the transmission rate information using the priority information for each channel, and selecting a transmission rate combination that lowers the transmission rate as the channel has a lower priority. The transmission method according to claim 12.   14. The transmission method according to claim 12, wherein a transmission rate is set on the assumption that a higher priority is assigned to a channel that transmits transmission data having a shorter allowable delay time.   A table storing transmission rate selection information that associates priorities with the first transmission time and the retransmission time is used, and information on whether or not the retransmission data is included in the combined transmission data is used. Then, referring to the transmission rate selection information, the transmission rate is set so that the transmission rate is lower for the transmission data at the time of the first transmission or the retransmission data at the time of the retransmission with a lower priority. The transmission method according to any one of claims 11 to 14.   16. The transmission method according to claim 11, wherein a different transmission rate is set for each retransmission for the retransmission data. Based on the priority order at the time of the first transmission and at the time of retransmission, the transmission data at the time of the first transmission or the transmission rate of the retransmission data at the time of retransmission for correcting an error in the transmission data at the communication partner is set for each channel. Variable setting step;
Combining the transmission data of the set transmission rate or the retransmission data between channels to generate combined transmission data;
Transmitting the generated composite transmission data;
Receiving the combined transmission data;
Separating the combined transmission data into data of each channel based on transmission rate information of the transmission data or retransmission data of each channel set on the transmission side;
If there is the retransmission data in the separated data, the error correction is performed on the previously received data with the retransmission data, and decoding;
A communication method comprising:

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