JP2006054617A - Communication device, base station device and signaling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make an accurate control compatible with the reduction of amount of outgoing line control signals, and to prevent a throughput of an outgoing line from being reduced. <P>SOLUTION: An SIR measuring part 104 measures an SIR. An error detecting part 111 detects an error. A scheduling part 115 outputs the information of the resource of each communication terminal equipment assigned by scheduling to a channel encode part 121 as an outgoing line control signal DL-SA, and when the resource to be assigned to re-transmission scheduled communication terminal equipment exceeds a reception power resource for an incoming packet, the common limiting quantity of the resource is assigned to the re-transmission scheduled communication terminal equipment, and the information of the assigned common limiting quantity is outputted to a channel encode part 117 as an outgoing line control signal DL-SR. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a communication apparatus, a base station apparatus, and a signaling method, and more particularly to a communication apparatus, a base station apparatus, and a signaling method that perform high-speed packet transmission on an uplink.

  Conventionally, various contrivances have been made for a method that enables high-speed packet transmission in a downlink from a radio base station to a communication terminal device, such as HSDPA (High Speed Downlink Packet Access). In recent years, in order to enable large-capacity or low-delay data transmission in the uplink from a communication terminal to a radio base station, 3GPP has been studying standardization of high-speed packet transmission in the uplink.

  In the high-speed packet transmission on the uplink, the introduction of scheduling technology is being studied as in the downlink. Uplink packet scheduling is performed in the base station, and the base station transmits the created scheduling information to each communication terminal apparatus. Each communication terminal apparatus transmits an uplink packet to the base station based on the scheduling information received from the base station. Further, the base station selects a communication terminal apparatus that is permitted to transmit an uplink packet by scheduling, and transmits the permitted transmission rate, transmission power, and the like to the selected communication terminal apparatus using a downlink control signal.

  One of the scheduling methods in high-speed packet transmission on the uplink is a method called Time and Rate Scheduling (for example, Non-Patent Document 1). Time and Rate Scheduling is composed of five steps as shown in FIG. 27 when HARQ (Hybrid Automatic Repeat reQuest) is applied. That is, in the first step, each of the communication terminal apparatuses 10 and 11 sends the requested transmission rate, data amount, transmission power margin, etc. to the uplink control signal UL-SI (Up Link Scheduling Information) # 13. To notify. Next, in the second step, the base station 12 performs scheduling based on the notified requested transmission rate, data amount, transmission power margin, etc., and selects and selects the communication terminal device 10 that permits transmission of the uplink packet. The communication terminal apparatus 10 is instructed by the downlink control signal DL-SA (Down Link Scheduling Assignment) # 14 about the permitted transmission rate and transmission power. Then, in the third step, the communication terminal apparatus 10 that has received the control signal addressed to the mobile terminal 10 is transmitted at a transmission rate equal to or lower than the transmission rate instructed by the base station 12 and a transmission power equal to or lower than the transmission power instructed from the base station 12. Line packet # 15 is transmitted. Furthermore, a fourth step and a fifth step are added as HARQ. In the fourth step, the base station 12 transmits the ACK signal # 16 when the reception of the uplink packet is successful, and transmits the NACK signal # 16 to the communication terminal device 10 when the reception fails. The communication terminal apparatus 10 that has received the NACK signal # 16 retransmits the uplink packet # 17 in the fifth step. Thereafter, the fourth step and the fifth step are repeated until the uplink packet is successfully received or the maximum number of retransmissions is reached.

Also, four methods are known as methods for applying HARQ to scheduling at a base station (for example, Non-Patent Document 2). The first method is to retransmit an uplink packet that has failed to be received at an arbitrary timing, and to transmit at the transmission rate and transmission power or transmission power offset indicated at the time of initial transmission (Asynchronous and autonomous retransmission) (hereinafter referred to as “retransmission method 1”). The second method is to retransmit an uplink packet that has failed to be received at an arbitrary timing, and to transmit in accordance with an instruction by scheduling every time regardless of initial transmission and retransmission (Asynchronous and scheduled retransmission) (hereinafter referred to as “asynchronous and scheduled retransmission”). , Described as “Resending method 2”). The third method is to retransmit at a fixed timing and transmit at the transmission rate and transmission power or transmission power offset specified at the time of initial transmission (Synchronous and autonomous retransmission) (hereinafter “Retransmission method 3”). "). The fourth method is to retransmit at a fixed timing and transmit according to an instruction by scheduling every time regardless of initial transmission and retransmission (Synchronous and scheduled retransmission) (hereinafter referred to as “retransmission method 4”) To do). The retransmission method 3 and the retransmission method 4 are methods in which retransmission is prioritized. The retransmission method 1 and the retransmission method 3 do not require the downlink control signal DL-SA for transmitting a scheduling instruction from the base station to the communication terminal apparatus at the time of retransmission. Therefore, the retransmission method 3 requires a small amount of the downlink control signal DL-SA in the system, but cannot control the communication terminal apparatus that performs retransmission, so the target value (RoT) of the total received power at the base station is not possible. (Rise over Thermal noise) target) may be exceeded. On the other hand, since retransmission method 4 can be controlled even for communication terminal apparatuses that perform retransmission, accurate control can be performed on the target value of total received power, but the amount of downlink control signal DL-SA increases.
3GPP, R1-030592, Node B Controlled Time and Rate Scheduling 3GPP, R1-040757, HARQ and Node B controlled scheduling

  However, in the conventional apparatus, when HARQ is applied to the scheduling at the base station, both the accurate control of resources at the base station and the reduction of the amount of the downlink control signal DL-SA are to be achieved. There is a problem that can not be. In addition, when the amount of downlink control signal DL-SA is large, a large amount of transmission power resources of the base station are required, which causes a problem that downlink throughput is reduced.

  FIGS. 28 and 29 are diagrams illustrating the retransmission method 3, and FIGS. 30 and 31 are diagrams illustrating the retransmission method 4. 28 to 31, it is assumed that the number of HARQ processes indicating a processing unit in HARQ is 3, and attention is paid to HARQ process0. In the case of FIGS. 28 to 31, the base station indicates a case where reception of data transmitted from all the communication terminal apparatuses MS # 20 to # 23 has failed, and all the base stations transmit NACK signals. Moreover, since FIGS. 28-31 shows the case where there is no restriction | limiting in the maximum frequency | count of resending, resending of all the communication terminal devices MS # 20- # 23 is continued. 29 and 31, the received power P1 is received power due to thermal noise, and the received power P2-P1 is received power due to interference components.

  In the case of retransmission method 3, from FIG. 28, communication terminal apparatus MS # 20 transmits uplink control signal UL-SI # 30 to the base station in TTI0, and communication terminal apparatus MS # 21 transmits uplink control signal in TTI3. UL-SI # 31 is transmitted to the base station, communication terminal apparatus MS # 22 transmits an uplink control signal UL-SI # 32 to the base station in TTI6, and communication terminal apparatus MS # 23 transmits an uplink control signal in TTI9. UL-SI # 33 is transmitted to the base station. The base station performs scheduling based on uplink control signals UL-SI # 30 to # 33 received from the communication terminal apparatuses MS # 20 to # 23. Then, the base station transmits downlink control signals DL-SA # 34 to # 37 to notify the scheduling result. Receiving the downlink control signals DL-SA # 34 to # 37, the communication terminal apparatuses MS # 20 to # 23 receive data within the range of the instructed transmission rate (MCS level) and transmission power or transmission power offset, respectively. Send. When the base station receives the data, it transmits an ACK signal or a NACK signal.

  From FIG. 28, the downlink control signals DL-SA # 34 to # 37 are transmitted only at the first transmission time of the respective communication terminal apparatuses MS # 20 to # 23, and the downlink control signals DL-SA # 34 to ## are transmitted. Since the overall amount of 37 is small, the influence on the downlink throughput is small. However, as shown in FIG. 29, the total received power P4 of the uplink TTI 15 and the total received power P5 of the base station in the TTI 18 exceed the target value P3 of the total received power, and accurate control cannot be performed. There is a problem that the number of reception failures increases and the throughput of the uplink decreases. There is also a problem that the amount of interference given to other cells on the uplink increases.

  In the case of retransmission method 4, communication terminal apparatus MS # 20 transmits uplink control signal UL-SI # 51 to the base station in TTI0, and communication terminal apparatus MS # 21 transmits uplink control signal UL- in TTI3. SI # 52 is transmitted to the base station, communication terminal apparatus MS # 22 transmits uplink control signal UL-SI # 53 to the base station in TTI6, and communication terminal apparatus MS # 23 transmits uplink control signal UL- in TTI9. SI # 54 is transmitted to the base station. The base station performs scheduling based on uplink control signals UL-SI # 51 to # 54 received from the communication terminal apparatuses MS # 20 to # 23. And a base station transmits downlink control signal DL-SA # 55- # 72 in order to notify a scheduling result. Receiving downlink control signals DL-SA # 55 to # 72, each communication terminal apparatus MS # 20 to # 23 receives data within the range of the instructed transmission rate (MCS level) and transmission power or transmission power offset. Send. When the base station receives the data, it transmits an ACK signal or a NACK signal.

  From FIG. 30, downlink control signals DL-SA # 55 to # 72 are transmitted at the time of initial transmission and retransmission of communication terminal apparatuses MS # 20 to # 23. That is, the downlink control signals DL-SA # 55 to # 72 are transmitted every time regardless of the initial transmission and the retransmission. Accordingly, as shown in FIG. 31, the total received power of the base station in the uplink TTI 15 and TTI # 18 does not exceed the target value P3 of the total received power, and the uplink can be performed because accurate control can be performed. There is no effect on throughput. However, since the downlink control signals DL-SA # 55 to # 72 are transmitted not only at the time of initial transmission of each of the communication terminal apparatuses MS # 20 to # 23 but also at the time of retransmission, the downlink control signal DL- The amount of SA # 55- # 72 is increasing. As a result, a large amount of downlink transmission power resource is consumed, and the transmission power resource allocated to the downlink packet is reduced, resulting in a problem that the downlink throughput is lowered. In addition, there is a problem that interference given to other cells in the downlink increases.

  The present invention has been made in view of the above points, and is capable of achieving both correct control and reducing the amount of downlink control signals, and can prevent a decrease in downlink throughput. An object is to provide a device, a base station device, and a signaling method.

  The communication apparatus according to the present invention includes: a scheduling unit that allocates a resource to a communication partner based on reception quality and allocates a resource limit amount common to the communication partner for limiting the resource to the communication partner; and the scheduling unit And a notification unit configured to transmit the information on the allocated resource to the communication partner and transmit the common resource limit information to the communication partner that has transmitted the resource information.

  According to this configuration, a common limit amount is allocated to the communication terminal device based on the reception quality of the communication terminal device, and information on the common limit amount is transmitted to the communication terminal device. It is possible to achieve both the reduction of the amount of control signal and to prevent a decrease in downlink throughput.

  The signaling method of the present invention includes a step of allocating resources to a communication partner based on reception quality and allocating a resource restriction amount common to the communication partner for restricting the resource to the communication partner; Transmitting information to the communication partner and transmitting the common resource limit information to the communication partner that has transmitted the resource information.

  According to this method, a common limit amount is allocated to the communication terminal device scheduled to be retransmitted based on the reception quality of the communication terminal device, and information on the common limit amount is transmitted to the communication terminal device. And a reduction in the amount of downlink control signals can be achieved, and a decrease in downlink throughput can be prevented.

  A communication system according to the present invention includes a communication device that transmits information on resources allocated based on reception quality, and a communication terminal device that transmits packet data using resources instructed by the resource information. The communication apparatus allocates a resource limit common to the communication terminal apparatus for limiting the resource to the communication terminal apparatus, and transmits the resource information to the communication terminal apparatus The information on the common resource limit amount is transmitted, and the communication terminal apparatus sets a resource limited by the limit amount indicated by the common resource limit amount information from the resource indicated by the resource information. At the same time, the packet data is transmitted using the set resource.

  According to this configuration, a common limit amount is allocated to the communication terminal device based on the reception quality of the communication terminal device, and information on the common limit amount is transmitted to the communication terminal device. It is possible to achieve both the reduction of the amount of control signal and to prevent a decrease in downlink throughput.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to aim at coexistence with exact control and reducing the quantity of a downlink control signal, the fall of the throughput of a downlink can be prevented.

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

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of communication apparatus 100 according to Embodiment 1 of the present invention. Despreading section 103, SIR measurement section 104, TPC generation section 105, demodulation section 106, channel decoding section 107, despreading section 108, demodulation section 109, channel decoding section 110, error detection section 111, despreading section 112, demodulation section 113 and the channel decoding unit 114 constitute reception signal processing units 136-1 to 136-n. The reception signal processing units 136-1 to 136-n are provided in the same number as the number of communication terminal apparatuses, and process the reception signals of the respective communication terminal apparatuses.

  The antenna 101 transmits the transmission signal input from the transmission radio unit 135, receives the signal, and outputs the signal to the reception radio unit 102.

  Reception radio section 102 down-converts the received signal input from antenna 101 from the radio frequency to the baseband frequency, and outputs the result to despreading section 103, despreading section 108, and despreading section 112.

  Despreading section 103 despreads the received signal input from reception radio section 102 and outputs the result to SIR measurement section 104 and demodulation section 106.

  SIR measurement section 104 measures SIR (desired wave power to interference wave power ratio) using a pilot signal included in the received signal input from despreading section 103, and generates TPC information on the measured SIR measurement value. To the unit 105.

  The TPC generation unit 105 generates and outputs a TPC command (UL-TPC) for controlling transmission power on the uplink from the information of the SIR measurement value input from the SIR measurement unit 104.

  Demodulation section 106 demodulates the reception signal input from despreading section 103 and outputs the demodulated reception data to channel decoding section 107.

  Channel decoding section 107 extracts and outputs a TPC command (DL-TPC) for controlling transmission power in the downlink included in the reception data input from demodulation section 106. Further, the channel decoding unit 107 outputs received data after extracting the TPC command.

  Despreading section 108 despreads the received signal input from reception radio section 102 and outputs the result to demodulation section 109.

  Demodulation section 109 demodulates the reception signal input from despreading section 108 and outputs the demodulated reception data to channel decoding section 110.

  Channel decoding section 110 combines the reception data input from demodulation section 109 with the past reception data for HARQ, decodes it, and outputs it to error detection section 111.

  The error detection unit 111 detects an error from the received data input from the channel decoding unit 110, and outputs an ACK signal indicating that the signal has been correctly received without error or a NACK signal indicating that the signal has not been correctly received. Further, the error detection unit 111 outputs received packet data when the error is detected as a result of the error detection.

  Despreading section 112 despreads the received signal input from reception radio section 102 and outputs the result to demodulation section 113.

  Demodulation section 113 demodulates the reception signal input from despreading section 112 and outputs the demodulated reception data to channel decoding section 114.

  Channel decoding section 114 extracts and outputs uplink control signal UL-SI included in the reception data input from demodulation section 113.

Scheduling section 115 receives SIR measurement value information input from SIR measurement section 104 of each received signal processing section 136-1 to 136-n, ACK signal or NACK signal input from error detection section 111, and from channel decoding section 114. Input uplink control signal UL-SI, rate combination information that is information of transmission rate candidates stored in advance in a storage unit (not shown), and reception power for uplink packets that is the maximum resource that can be allocated to the communication terminal device Scheduling is performed based on the resource information, and resources are allocated to each communication terminal device. Scheduling section 115 then outputs the resource information of each allocated communication terminal apparatus to channel encoding section 121 as downlink control signal DL-SA, and the resource allocated to the communication terminal apparatus scheduled for retransmission is received for uplink packets. When the power resource is exceeded, a common resource limit amount is allocated to the communication terminal apparatus scheduled to be retransmitted, and the allocated common limit amount information (common reduction amount information) is a downlink control signal DL− that is a signaling signal. It outputs to the channel encoding part 117 as SR (Down Link Scheduling Restriction). Details of the scheduling unit 115 will be described later.

  The transmission power setting unit 116 sets a predetermined transmission power and controls the multiplier 120 and the multiplier 124 so that the set transmission power is obtained.

  Channel encoding section 117 encodes transmission data including downlink control signal DL-SR input from scheduling section 115 and outputs the encoded transmission data to modulation section 118.

  Modulating section 118 modulates the transmission data input from channel encoding section 117 and outputs the modulated transmission signal to spreading section 119.

  Spreading section 119 performs spreading processing on the transmission signal input from modulation section 118 and outputs the result to multiplier 120.

  The multiplier 120 controls the transmission power setting unit 116 to change the transmission signal input from the spreading unit 119 to a predetermined transmission power and output the transmission signal to the transmission radio unit 135.

  Channel encoding section 121 encodes transmission data including downlink control signal DL-SA input from scheduling section 115 and outputs the encoded transmission data to modulation section 122.

  Modulation section 122 modulates the transmission data input from channel encoding section 121 and outputs the modulated transmission signal to spreading section 123.

  Spreading section 123 performs spreading processing on the transmission signal input from modulating section 122 and outputs the result to multiplier 124.

  The multiplier 124 controls the transmission power setting unit 116 to change the transmission signal input from the spreading unit 123 to a predetermined transmission power and output the transmission signal to the transmission radio unit 135.

  The transmission power setting unit 125 sets a predetermined transmission power, and controls the multiplier 129 so that the set transmission power is obtained.

  Channel encoding section 126 encodes transmission data including an ACK signal or NACK signal input from error detection section 111 and outputs the encoded transmission data to modulation section 127.

  Modulating section 127 modulates the transmission data input from channel encoding section 126 and outputs the modulated transmission signal to spreading section 128.

  Spreading section 128 spreads the transmission signal input from modulating section 127 and outputs the result to multiplier 129.

  The multiplier 129 controls the transmission power setting unit 125 to change the transmission signal input from the spreading unit 128 to a predetermined transmission power and output the transmission signal to the transmission radio unit 135.

  The transmission power setting unit 130 sets a predetermined transmission power and controls the multiplier 134 so that the set transmission power is obtained.

  The channel encoding unit 131 encodes a pilot signal that is a known symbol, the TPC command (UL-TPC) generated by the TPC generation unit 105, and transmission data, and outputs the encoded data to the modulation unit 132.

  Modulating section 132 modulates the transmission data input from channel encoding section 131 and outputs the modulated transmission signal to spreading section 133.

  Spreading section 133 performs a spread process on the transmission signal input from modulation section 132 and outputs the result to multiplier 134.

  The multiplier 134 converts the transmission signal input from the spreading section 133 to a predetermined transmission power and outputs the transmission signal to the transmission radio section 135 under the control of the transmission power setting section 130.

  The transmission radio unit 135 changes the transmission signal input from the multiplier 120, the transmission signal input from the multiplier 124, the transmission signal input from the multiplier 129, and the transmission signal input from the multiplier 134 from the baseband frequency to the radio frequency. Up-convert and transmit from antenna 101.

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

  The antenna 201 receives the signal and outputs the signal to the reception radio unit 202 and transmits the transmission signal input from the transmission radio unit 238.

  Reception radio section 202 down-converts the received signal received by antenna 201 from a radio frequency to a baseband frequency, and outputs the result to despreading section 203, despreading section 208, despreading section 211, and despreading section 214.

  Despreading section 203 despreads the received signal input from reception radio section 202 and outputs the result to SIR measurement section 204 and demodulation section 206.

  SIR measurement section 204 measures SIR using a pilot signal included in the received signal input from despreading section 203, and outputs information on the measured SIR measurement value to TPC generation section 205.

  The TPC generation unit 205 generates and outputs a TPC command (DL-TPC) for controlling transmission power in the downlink from the information of the SIR measurement value input from the SIR measurement unit 204.

  Demodulation section 206 demodulates the reception signal input from despreading section 203 and outputs the demodulated reception data to channel decoding section 207.

  Channel decoding section 207 extracts a TPC command (UL-TPC) for controlling transmission power on the uplink included in the reception data input from demodulation section 206. Further, channel decoding section 207 outputs received data after extracting the TPC command.

  Despreading section 208 despreads the received signal input from reception radio section 202 and outputs the result to demodulation section 209.

  Demodulation section 209 demodulates the reception signal input from despreading section 208 and outputs the demodulated reception data to channel decoding section 210.

  The channel decoding unit 210 decodes the reception data input from the demodulation unit 209 and extracts an ACK signal indicating that the communication device 100 has been correctly received or a NACK signal indicating that the communication device 100 has not been correctly received. To the transmission counter 217 and the buffer 222.

  Despreading section 211 despreads the received signal input from reception radio section 202 and outputs the result to demodulation section 212.

  Demodulation section 212 demodulates the reception signal input from despreading section 211 and outputs the demodulated reception data to channel decoding section 213.

  Channel decoding section 213 decodes the reception data input from demodulation section 212, extracts downlink control signal DL-SA, and outputs it to DL-SA storage section 220.

  Despreading section 214 despreads the received signal input from reception radio section 202 and outputs the result to demodulation section 215.

  Demodulation section 215 demodulates the reception signal input from despreading section 214 and outputs the demodulated reception data to channel decoding section 216.

  Channel decoding section 216 decodes the reception data input from demodulation section 215, extracts downlink control signal DL-SR, and outputs it.

  The transmission number counter 217 counts the number of transmissions from the ACK signal or NACK signal input from the channel decoding unit 210 and outputs information on the counted number of transmissions to the switching unit 221 and the offset amount control unit 227.

  The transmission power control unit 218 calculates transmission power based on the TPC command input from the channel decoding unit 207 and sets the transmission power. Then, transmission power control section 218 outputs the set transmission power to transmission power measurement section 219 and transmission power control section 228.

  The transmission power measuring unit 219 subtracts the transmission power input from the transmission power control unit 218 from the maximum transmission power from the maximum transmission power information that is the information of the input maximum transmission power, and the remaining resources, that is, the remaining transmission power. Is output to the rate request selection unit 224, the transmission rate selection unit 225, and the UL-SI generation unit 229.

  The DL-SA storage unit 220 stores the downlink control signal DL-SA input from the channel decoding unit 213. Then, the DL-SA storage unit 220 outputs the stored downlink control signal DL-SA to the switching unit 221.

  The switching unit 221 selects the downlink control signal DL-SA input from the channel decoding unit 216 and outputs it to the transmission rate selection unit 225 and the transmission parameter setting unit 226 at the time of initial transmission. In addition, the switching unit 221 selects the downlink control signal DL-SA stored in the DL-SA storage unit 220 during retransmission, and outputs the downlink control signal DL-SA to the transmission rate selection unit 225 and the transmission parameter setting unit 226.

  The buffer 222 temporarily stores the input transmission packet data. The buffer 222 discards the stored transmission packet data when the ACK signal is input from the channel decoding unit 210, and stores the stored transmission packet when the NACK signal is input from the channel decoding unit 210. Data is output to the channel encoding unit 230 by the amount specified by the transmission parameter setting unit 226.

  The data amount measuring unit 223 measures the data amount based on the data amount information input from the buffer 222 at a predetermined time, and the measured data amount information is generated by the rate request selecting unit 224, the transmission rate selecting unit 225, and the UL-SI generation. Output to the unit 229.

  The rate request selection unit 224 transmits the transmission rate based on the transmission rate information input from the transmission rate selection unit 225, the remaining transmission power information input from the transmission power measurement unit 219, and the data amount information input from the data amount measurement unit 223. Is generated, and rate request information, which is information requested to the communication apparatus 100 in order to allow transmission at the selected transmission rate, is generated and output to the UL-SI generation unit 229.

  The transmission rate selection unit 225 includes information on the remaining transmission power input from the transmission power measurement unit 219, information on the amount of data input from the data amount measurement unit 223, a downlink control signal DL-SA input from the switching unit 221, and not illustrated. An optimal transmission rate is selected from the transmission rate candidates based on rate combination information that is information on transmission rate candidates stored in advance in the storage unit. Then, the transmission rate selection unit 225 outputs information on the selected transmission rate to the rate request selection unit 224 and the transmission parameter setting unit 226.

  Based on the transmission rate information input from the transmission rate selection unit 225, the transmission parameter setting unit 226 sets transmission parameters such as the number of bits to be transmitted, the coding rate, the number of modulation levels, the transmission power offset amount, and the spreading factor. select. Then, transmission parameter setting section 226 outputs instruction information for instructing output of the selected number of bits to buffer 222. Also, transmission parameter setting section 226 outputs instruction information, which is information for encoding at the selected coding rate, to channel encoding section 230. Further, the transmission parameter setting unit 226 outputs instruction information, which is information for performing modulation with the selected modulation multilevel number, to the modulation unit 231. Further, transmission parameter setting section 226 outputs instruction information, which is information for performing a spreading process at the selected spreading factor, to spreading section 232. Further, transmission parameter setting section 226 outputs an offset amount determined based on downlink control signal DL-SA input from switching section 221 to offset amount control section 227.

  The offset amount control unit 227 outputs the offset amount instruction information input from the transmission parameter setting unit 226 to the transmission power control unit 228 as it is when the number of transmissions is the first from the transmission number information input from the transmission number counter 217. To do. In addition, in the case of retransmission, the offset amount control unit 227 responds to the offset amount instruction information input from the transmission parameter setting unit 226 based on the information on the number of transmissions input from the transmission number counter 217. Is corrected by the downlink control signal DL-SR input from, and the offset amount is calculated and output to the transmission power control unit 228.

  The transmission power control unit 228 multiplies the transmission power input from the transmission power control unit 218 controlled by the transmission power control command (UL-TPC) by the offset amount input from the offset amount control unit 227. Set as transmit power. Then, the transmission power control unit 228 controls the multiplier 233 so that the set transmission power is obtained.

  The UL-SI generation unit 229 includes the uplink transmission information including the remaining transmission power information input from the transmission power measurement unit 219, the data amount information input from the data amount measurement unit 223, and the rate request information input from the rate request selection unit 224. A line control signal UL-SI is generated, and the generated uplink control signal UL-SI is output to the channel encoder 230.

  Based on the instruction information input from transmission parameter setting section 226, channel encoding section 230 encodes and modulates transmission packet data input from buffer 222 and uplink control signal UL-SI input from UL-SI generation section 229. Output to the unit 231.

  Based on the instruction information input from transmission parameter setting section 226, modulation section 231 modulates transmission packet data input from channel encoding section 230 and outputs the modulated data to spreading section 232.

  Based on the instruction information input from transmission parameter setting section 226, spreading section 232 performs spreading processing on the transmission packet data input from modulation section 231 and outputs the result to multiplier 233.

  The multiplier 233 outputs the transmission packet data input from the spreading unit 232 with a predetermined transmission power to the transmission radio unit 238 under the control of the transmission power control unit 228.

  The channel encoding unit 234 encodes a pilot signal that is a known symbol, the TPC command generated by the TPC generation unit 205, and transmission data, and outputs the encoded data to the modulation unit 235.

  Modulation section 235 modulates the transmission data input from channel encoding section 234 and outputs the modulated transmission signal to spreading section 236.

  Spreading section 236 performs spreading processing on the transmission signal input from modulation section 235 and outputs the result to multiplier 237.

  The multiplier 237 outputs the transmission signal input from the spreading unit 236 with a predetermined transmission power to the transmission radio unit 238 under the control of the transmission power control unit 218.

  The transmission radio unit 238 up-converts the transmission signal input from the multiplier 232 and the transmission signal input from the multiplier 237 from a baseband frequency to a radio frequency and transmits the result from the antenna 201.

  Next, a detailed configuration of the scheduling unit 115 will be described with reference to FIG. FIG. 3 is a block diagram illustrating a configuration of the scheduling unit 115.

  The terminal selection unit 301 determines a communication terminal device for initial transmission and a communication terminal device for retransmission from the ACK signal and NACK signal input from the error detection unit 111. And the terminal selection part 301 determines the priority of a communication terminal apparatus based on the uplink control signal UL-SI input from the channel decoding part 114, and the determination result of initial transmission and retransmission, and determined priority The terminal numbers of the communication terminal apparatuses arranged in the order of rank are output to DL-SA selection section 305.

  The DL-SA storage unit 302 stores the downlink control signal DL-SA at the time of initial transmission in each communication terminal apparatus input from the DL-SA selection unit 305. Then, when the ACK signal is input from the error detection unit 111, the DL-SA storage unit 302 deletes the corresponding downlink control signal DL-SA of the corresponding communication terminal device. Also, when a NACK signal is input from the error detection unit 111, the DL-SA storage unit 302 holds the corresponding downlink control signal DL-SA of the corresponding communication terminal device as it is and scheduling is started. Stored downlink control signal DL-SA is output to retransmission credit received power resource calculation section 303.

  Retransmission received power resource calculation section 303 uses the SIR measurement result of each communication terminal apparatus 100 input from SIR measurement section 104 and the downlink control signal DL-SA at the time of initial transmission input from DL-SA storage section 302. Based on this, the total power resource required by all the communication terminal devices scheduled to be retransmitted is calculated. Retransmission credit received power resource calculation section 303 then outputs the total value of the power resources required by all communication terminal apparatuses scheduled for retransmission to control amount calculation section 304 and DL-SA selection section 305.

  The limit amount calculation unit 304 determines whether or not the total value of the reception power resources required by all the communication terminal devices scheduled to be retransmitted input from the retransmission credit reception power resource calculation unit 303 is equal to or less than the reception power resource for uplink packets. Determine whether. When the total value of the reception power resources exceeds the reception power resource for uplink packets, the limit amount calculation unit 304 calculates the amount exceeding the reception power resource for uplink packets (for example, xdB), and In order not to exceed the received power resource, a limit amount for limiting the received power resource is allocated to each communication terminal apparatus scheduled to be retransmitted. Specifically, the limit amount calculation unit 304 is configured to receive the uplink packet received power so that the received power resource limit amount of each communication terminal apparatus scheduled for retransmission is the same in each communication terminal apparatus scheduled for retransmission. The amount exceeding the resource (for example, xdB) is set as the limit amount of each communication terminal device scheduled to be retransmitted. Then, the limit amount is assigned to each communication terminal device scheduled to be retransmitted. Limit amount calculation section 304 then outputs the allocated limit amount information to DL-SA selection section 305 and outputs the allocated limit amount information to channel encoding section 117 as downlink control signal DL-SR. Limit amount calculation section 304 outputs nothing when the total value of received power resources is equal to or less than the received power resource for uplink packets.

  DL-SA selection section 305, when all communication terminal apparatuses are the first transmission, SIR measurement result input from SIR measurement section 104, uplink control signal UL-SI and rate input from channel decoding section 114 Based on the combination information, the received power resource is allocated to each communication terminal device in the order of the terminal numbers arranged in the order of priority input from the terminal selection unit 301 with resources below the received power resource for uplink packets. Then, DL-SA selecting section 305 outputs the allocated resource information to channel encoding section 121 as downlink control signal DL-SA.

  Also, the DL-SA selection unit 305, when both the initial transmission communication terminal device and the retransmission communication terminal device exist, the retransmission scheduled communication terminal device input from the retransmission credit received power resource calculation unit 303 Based on the information on the received power resource to be allocated, the received power resource is allocated to the communication terminal device scheduled to be retransmitted. Then, when the received power resource is not limited by the limit calculation unit 304, the DL-SA selecting unit 305 calculates the total received power resource value of the communication terminal apparatus scheduled to be retransmitted from the received power resource for uplink packets. The remaining resource after the subtraction is allocated as the reception power resource of the communication terminal device for the first transmission. In addition, when the received power resource is limited by the limit amount calculation unit 304, the DL-SA selecting unit 305 limits the resource indicated by the downlink control signal DL-SA from the received power resource for the uplink packet. The remaining resources obtained by subtracting the total value of the received power resources of the communication terminal device scheduled to be retransmitted after subtracting the amount are allocated as the received power resources of the communication terminal device of the first transmission.

  Also, DL-SA selection section 305 does not output downlink control signal DL-SA when all communication terminal apparatuses are retransmitted.

  Next, operations of the communication device 100 and the communication terminal device 200 will be described with reference to FIGS. 4 and 5. 4 and 5 are flowcharts showing operations of the communication device 100 and the communication terminal device 200. FIG.

  First, communication terminal apparatus 200 generates uplink control signal UL-SI at UL-SI generating section 229 (step ST401). Communication terminal apparatus 200 transmits generated uplink control signal UL-SI (step ST402).

  Next, communication apparatus 100 receives uplink control signal UL-SI transmitted from communication terminal apparatus 200 (step ST403). Next, communication apparatus 100 performs error detection at error detection section 111 (step ST404). Communication apparatus 100 measures SIR by SIR measurement section 104 (step ST405).

  Next, communication apparatus 100 determines in scheduling section 115 whether there is a NACK signal for received data from all communication terminal apparatuses, that is, whether there is an error (step ST406). When there is an error, scheduling section 115 calculates retransmission credit received power resource of the communication terminal apparatus scheduled to be retransmitted (step ST407). Next, scheduling section 115 determines whether or not the total value of retransmission credit received power resources of all communication terminal apparatuses scheduled to be retransmitted is equal to or lower than the uplink packet received power resource (step ST408).

  When the total value of the reception power resources for retransmission is not less than or equal to the reception power resource for uplink packets, the scheduling unit 115 sets the limit amount such that the retransmission credit reception power resource becomes the reception power resource for uplink packets. By allocating to the terminal device, retransmission credit received power resource is limited (step ST409). For example, if the excess resource is x dB, the scheduling unit 115 retransmits the received power resource limit amount of each communication terminal apparatus scheduled for retransmission to be the same in each communication terminal apparatus scheduled for retransmission. This is the limit amount of each scheduled communication terminal device. Then, the limit amount is allocated to each communication terminal device scheduled to be retransmitted. Scheduling section 115 then assigns to each communication terminal apparatus a reception power resource that takes into account the limit of the reception power resource allocated to the communication terminal apparatus to be retransmitted (step ST410). Next, scheduling section 115 generates a reception power resource limit amount allocated to the communication terminal apparatus scheduled to be retransmitted as downlink control signal DL-SR (step ST411).

  On the other hand, when there is no error for all communication terminal apparatuses in step ST406, there is no need for retransmission, and in step ST408, the total value of retransmission credit received power resources of all the communication terminal apparatuses scheduled to be retransmitted is for uplink packets. If the received power resource is less than or equal to the received power resource, communication apparatus 100 performs scheduling in scheduling section 115 and generates downlink control signal DL-SA (step ST412).

  Next, communication apparatus 100 transmits downlink control signal DL-SR generated in step ST411 or downlink control signal DL-SA generated in step ST412 (step ST413). Next, communication terminal apparatus 200 receives downlink control signal DL-SR or downlink control signal DL-SA transmitted from communication apparatus 100 (step ST414).

  Next, when communication terminal apparatus 200 receives downlink control signal DL-SA, communication parameter setting section 226 sets transmission parameters based on downlink control signal DL-SA and the like (step ST415). . Next, communication terminal apparatus 200 determines whether or not offset amount control section 227 receives downlink control signal DL-SR (step ST416). When the downlink control signal DL-SR is received, the offset amount control unit 227 calculates the offset amount considering the downlink control signal DL-SR, and the transmission power control unit 228 is based on the offset amount. A transmission power resource is allocated (step ST417). On the other hand, when downlink control signal DL-SR is not received, for example, when it is the first transmission, transmission power resources are allocated based on downlink control signal DL-SA and the like (step ST418). Next, communication terminal apparatus 200 performs transmission power control at transmission power control section 228 (step ST419), and transmits transmission packet data with the transmission power instructed by communication apparatus 100.

  Next, a method for assigning transmission power resources by downlink control signal DL-SR will be described with reference to FIG. 6, for example, when communication device 100 assigns transmission power resources to four communication terminal devices 200. FIG. 6 is a diagram illustrating a method for allocating transmission power resources using the downlink control signal DL-SR.

  Communication terminal apparatus MS # 601 transmits uplink control signal UL-SI # 610 to communication apparatus 100 at TTI0 (step ST660). Receiving uplink control signal UL-SI # 610, communication apparatus 100 transmits downlink control signal DL-SA # 611 to communication terminal apparatus MS # 601 at TTI0 (step ST661).

  Next, communication terminal apparatus MS # 601 having received downlink control signal DL-SA # 611 transmits transmission packet data # 612 generated based on downlink control signal DL-SA # 611 in TTI3 (step S1). ST662). Communication terminal apparatus MS # 602 transmits uplink control signal UL-SI # 613 to communication apparatus 100 in TTI3 (step ST663).

  Next, communication apparatus 100 that has received uplink control signal UL-SI # 613 transmits downlink control signal DL-SA # 614 to communication terminal apparatus MS # 602 in TTI3 (step ST664). In addition, communication apparatus 100 that has received transmission packet data # 612 transmits NACK signal # 615 as a result of error determination using TTI3 (step ST665).

  Next, communication terminal apparatus MS # 601 having received the NACK signal transmits first retransmission data # 616 of transmission packet data # 612 by TTI6 (step ST666). Also, communication terminal apparatus MS # 602 receiving downlink control signal DL-SA # 614 transmits transmission packet data # 617 generated based on downlink control signal DL-SA # 614 by TTI6 (step ST667). ). Also, communication terminal apparatus MS # 603 transmits uplink control signal UL-SI # 618 to communication apparatus 100 using TTI6 (step ST668).

  Next, communication apparatus 100 that has received uplink control signal UL-SI # 618 transmits downlink control signal DL-SA # 619 to communication terminal apparatus MS # 603 in TTI6 (step ST669). In addition, communication apparatus 100 that has received transmission packet data # 617 transmits NACK signal # 620 as a result of error determination using TTI 6 (step ST670). In addition, communication apparatus 100 that has received retransmission data # 616 transmits NACK signal # 621 as a result of error determination using TTI 6 (step ST671).

  Next, communication terminal apparatus MS # 601 having received the NACK signal transmits second retransmission data # 622 of transmission packet data # 612 by TTI9 (step ST672). Communication terminal apparatus MS # 602 that has received the NACK signal transmits first retransmission data # 623 of transmission packet data # 617 using TTI 9 (step ST673). Communication terminal apparatus MS # 603 that has received downlink control signal DL-SA # 619 transmits transmission packet data # 624 generated based on downlink control signal DL-SA # 619 in TTI9 (step ST674). ). Also, communication terminal apparatus MS # 604 transmits uplink control signal UL-SI # 625 to communication apparatus 100 in TTI9 (step ST675).

  Next, communication apparatus 100 that has received uplink control signal UL-SI # 625 transmits downlink control signal DL-SA # 626 to communication terminal apparatus MS # 604 at TTI9 (step ST676). In addition, communication apparatus 100 that has received transmission packet data # 624 transmits NACK signal # 627 as a result of error determination using TTI 9 (step ST677). In addition, communication apparatus 100 that has received retransmission data # 623 transmits NACK signal # 628 as a result of error determination using TTI 9 (step ST678). Further, communication apparatus 100 that has received retransmission data # 622 transmits NACK signal # 629 as a result of error determination using TTI 9 (step ST679).

  Next, communication terminal apparatus MS # 601 that has received the NACK signal transmits third-time retransmission data # 630 of transmission packet data # 612 using TTI 12 (step ST680). Communication terminal apparatus MS # 602 that has received the NACK signal transmits second retransmission data # 631 of transmission packet data # 617 by TTI12 (step ST681). Communication terminal apparatus MS # 603 that has received the NACK signal transmits first retransmission data # 632 of transmission packet data # 624 by TTI 12 (step ST682). Communication terminal apparatus MS # 604 that has received downlink control signal DL-SA # 626 transmits transmission packet data # 633 generated based on downlink control signal DL-SA # 626 using TTI12 (step ST683). ).

  Next, communication apparatus 100 that has received transmission packet data # 633 transmits NACK signal # 634 as a result of error determination using TTI 12 (step ST684). Communication apparatus 100 that has received retransmission data # 632 transmits NACK signal # 635 as a result of error determination using TTI 12 (step ST685). In addition, communication apparatus 100 that has received retransmission data # 631 transmits NACK signal # 636 as a result of error determination using TTI 12 (step ST686). In addition, communication apparatus 100 that has received retransmission data # 630 transmits NACK signal # 637 as a result of error determination using TTI 12 (step ST687).

  Next, communication terminal apparatus MS # 601 having received the NACK signal transmits retransmission data # 638 for the fourth time of transmission packet data # 612 using TTI 15 (step ST688). In addition, communication terminal apparatus MS # 602 that has received the NACK signal transmits third retransmission data # 639 of transmission packet data # 617 using TTI 15 (step ST689). In addition, communication terminal apparatus MS # 603 that has received the NACK signal transmits second retransmission data # 640 of transmission packet data # 624 by TTI 15 (step ST690). In addition, communication terminal apparatus MS # 604 that has received the NACK signal transmits first retransmission data # 641 of transmission packet data # 633 by TTI15 (step ST691).

  Next, communication apparatus 100 that has received retransmission data # 641 transmits NACK signal # 642 as a result of error determination using TTI 15 (step ST692). Communication apparatus 100 that has received retransmission data # 640 transmits NACK signal # 643 as a result of error determination using TTI 15 (step ST693). In addition, communication apparatus 100 that has received retransmission data # 639 transmits NACK signal # 644 as a result of error determination using TTI 15 (step ST694). In addition, communication apparatus 100 that has received retransmission data # 638 transmits NACK signal # 645 as a result of error determination using TTI 15 (step ST695). Then, the above processing is repeated in the same manner.

  FIG. 7 is a diagram showing resources allocated to the communication terminal apparatus corresponding to FIG. In FIG. 7, received power P703 is received power due to thermal noise, and received power P702-P703 is received power due to interference components.

  In TTI3, since the total value of resources allocated to the communication terminal apparatus is smaller than the target value P701 of total received power, the communication apparatus 100 indicates the downlink control signal DL indicating the received power resource limit “0” in TTI3. -Send SR # 650.

  Next, in TTI6, since the total value of the resources allocated to the communication terminal apparatus is smaller than the total received power target value P701, the communication apparatus 100 indicates the downlink indicating the received power resource limit “0” in TTI6. A control signal DL-SR # 651 is transmitted.

  Next, in TTI9, since the total value of resources allocated to the communication terminal apparatus is smaller than the target value P701 of total received power, the communication apparatus 100 is configured to indicate a downlink power limit amount “0” in TTI9. Control signal DL-SR # 652 is transmitted.

  Next, in TTI12, when the resource is not limited, the total value of resources allocated to the communication terminal apparatus becomes larger than the target value P701 of the total reception power, so that the communication apparatus 100 determines the received power resource in TTI12. A downlink control signal DL-SR # 653 indicating the limit amount “1” is transmitted. At this time, for example, the reception power resource that does not consider the downlink control signal DL-SR of the communication terminal apparatus MS # 601 is a [dB], and the reception power that does not consider the downlink control signal DL-SR of the communication terminal apparatus MS # 602. The resource is b [dB], the received power resource not considering the downlink control signal DL-SR of the communication terminal apparatus MS # 603 is c [dB], and the downlink control signal DL-SR of the communication terminal apparatus MS # 604 is considered. When the received power resource not to be received is d [dB], a-1 [dB] is assigned as the received power resource to the communication terminal apparatus MS # 601 by considering the downlink control signal DL-SR, and the communication terminal Apparatus MS # 602 is assigned b-1 [dB] as a received power resource, and communication terminal apparatus MS # 603 is assigned c as a received power resource. 1 with the assigned [dB], d-1 [dB] is assigned as the received power resources to the communication terminal MS # 604.

  Next, in TTI 15, the total value of resources allocated to the communication terminal apparatus becomes larger than the total received power target value P 701, so that the communication apparatus 100 downloads the received power resource limit amount “2” in TTI 15. A line control signal DL-SR # 654 is transmitted. At this time, for example, the reception power resource that does not consider the downlink control signal DL-SR of the communication terminal apparatus MS # 601 is a [dB], and the reception power that does not consider the downlink control signal DL-SR of the communication terminal apparatus MS # 602. The resource is b [dB], the received power resource not considering the downlink control signal DL-SR of the communication terminal apparatus MS # 603 is c [dB], and the downlink control signal DL-SR of the communication terminal apparatus MS # 604 is considered. When the received power resource not to be received is d [dB], a-2 [dB] is assigned as the received power resource to the communication terminal apparatus MS # 601 by considering the downlink control signal DL-SR. The device MS # 602 is assigned b-2 [dB] as the received power resource, and the communication terminal device MS # 603 is assigned c as the received power resource. 2 together are assigned [dB], d-2 [dB] is assigned as the received power resources to the communication terminal MS # 604.

  When there is a communication terminal apparatus scheduled to be retransmitted, only the downlink control signal DL-SR is added, so the amount of downlink control signal is as follows for all communication terminal apparatuses scheduled to retransmit. Compared with the case of transmitting the downlink control signal DL-SA, the amount of control signal is significantly reduced. This becomes more effective as the number of communication terminal devices scheduled to be retransmitted increases. 6 and 7 show the case where the number of communication terminals permitting initial transmission at the same time is 1, but in reality the number of communication terminals permitting simultaneous initial transmission is considered to be about 5 to 10, and at least Assuming that the number of communication terminal apparatuses to be retransmitted at the same time is about 10 to 20, the amount of signaling required for the communication terminal apparatus to be retransmitted is between 1/10 and 1/20. The impact on line throughput is very small.

  FIG. 8 is a diagram illustrating signaling by the downlink control signal DL-SR, and the downlink control signal DL-SR in this case is set by the transmission parameter setting unit 226 at the time of initial transmission of each communication terminal apparatus. This indicates the limit amount for the offset amount, that is, the limit amount for the offset value of the resource of a specific channel such as DPCCH. The downlink control signal DL-SR indicating the limit “0” for the offset value of the received power resource is “00”, and the downlink control signal DL-SR indicating the limit “1” for the offset value of the received power resource is The downlink control signal DL-SR that is “01” and indicates the limit “2” for the offset value of the received power resource is “10”, and the downlink that indicates the limit “3” for the offset value of the received power resource The control signal DL-SR is “11”. FIG. 8 shows a case where the downlink control signal DL-SR is transmitted even when the resource is not limited. However, when the resource is not limited, the downlink control signal DL-SR is not transmitted. May be.

  FIG. 9 is a diagram showing another example of downlink DL-SR signaling. In this case, the downlink control signal DL-SR is a transmission power offset at the time of initial transmission of each communication terminal device, that is, DPCCH, etc. The offset value with respect to the channel serving as the reference is shown. The downlink control signal DL-SR indicating the limit “0” for the offset of the received power resource is “00”, and the downlink control signal DL-SR indicating the limit “1” for the offset of the received power resource is “01”. The downlink control signal DL-SR indicating the limit amount “2” with respect to the offset of the received power resource is “10”, and the downlink control signal DL-SR instructing the stop of retransmission is “11”. FIG. 9 shows a case where the downlink control signal DL-SR is transmitted even when the resource is not limited. However, when the resource is not limited, the downlink control signal DL-SR is not transmitted. May be.

  FIG. 10 is a diagram illustrating still another example of signaling by DL-SR in the downlink. In this case, in FIG. 2, when downlink control signal DL-SR output from channel decoding section 216 is input to transmission power control section 228, transmission power control section 228 is instructed by downlink control signal DL-SR. The transmission power is limited by the limited amount. The downlink control signal DL-SR indicating the received power resource limit “0” is “00”, and the downlink control signal DL-SR indicating the received power resource limit “1” is “01”. The downlink control signal DL-SR indicating the received power resource limit “2” is “10”, and the downlink control signal DL-SR indicating the received power resource limit “3” is “11”. FIG. 10 shows a case where the downlink control signal DL-SR is transmitted even when the resource is not limited. However, when the resource is not limited, the downlink control signal DL-SR is not transmitted. May be.

  FIG. 11 is a diagram illustrating still another example of signaling by DL-SR in the downlink. In this case, in FIG. 2, when downlink control signal DL-SR output from channel decoding section 216 is input to transmission power control section 228, transmission power control section 228 is instructed by downlink control signal DL-SR. The transmission power is limited by the limited amount. The downlink control signal DL-SR indicating the received power resource limit “0” is “00”, and the downlink control signal DL-SR indicating the received power resource limit “1” is “01”. The downlink control signal DL-SR indicating the received power resource limit “2” is “10”, and the downlink control signal DL-SR instructing retransmission stop is “11”. FIG. 11 shows a case where the downlink control signal DL-SR is transmitted even when the resource is not limited. However, when the resource is not limited, the downlink control signal DL-SR is not transmitted. May be.

  Further, as another example of downlink DL-SR signaling, information on a difference between a resource allocated to a communication terminal device at the time of initial transmission or a resource of a specific channel and a resource limit amount may be used.

  Thus, according to the first embodiment, the common limit amount from the resources allocated by the downlink control signal DL-SA based on the reception quality of the communication terminal apparatus scheduled to be retransmitted is set as the communication terminal apparatus scheduled to retransmit. Is allocated within the maximum allocatable resource, and the downlink control signal DL-SA is transmitted as common limit amount information to the communication terminal apparatus scheduled to be retransmitted. Thus, it is possible to achieve both the accurate control of the communication and the amount of the downlink control signal, and it is possible to prevent the throughput of the uplink and the downlink from being lowered.

  In the first embodiment, the downlink control signal DL-SR is used in order to accurately control the target value of the total received power of the base station. The downlink control signal DL-SR may be used to control the rate of transmission resource allocation. In this case, a more flexible system operation can be performed.

(Embodiment 2)
FIG. 12 is a block diagram showing a configuration of scheduling section 115 according to Embodiment 2 of the present invention.

  As shown in FIG. 12, scheduling section 115 according to Embodiment 2 adds conversion section 1201 to scheduling section 115 according to Embodiment 1 shown in FIG. In FIG. 12, parts having the same configuration as in FIG. In addition, the configuration of the communication apparatus including the scheduling unit 115 is the same as that in FIG. 1 and the configuration of the communication terminal apparatus is the same as that in FIG.

  The limit amount calculation unit 304 determines whether or not the total value of the reception power resources required by all the communication terminal devices scheduled to be retransmitted input from the retransmission credit reception power resource calculation unit 303 is equal to or less than the reception power resource for uplink packets. Determine whether. When the total value of the reception power resources exceeds the reception power resource for uplink packets, the limit amount calculation unit 304 calculates the amount exceeding the reception power resource for uplink packets (for example, xdB), and In order not to exceed the received power resource, a limit amount for limiting the received power resource is allocated to each communication terminal apparatus scheduled to be retransmitted. Specifically, the limit amount calculation unit 304 plans to retransmit the xdB so that the limit amount of the received power resource of each communication terminal device scheduled for retransmission is the same in each communication terminal device scheduled for retransmission. This is the limit amount of each communication terminal device. Then, the limit amount is allocated to each communication terminal device scheduled to be retransmitted. Then, the restriction amount calculation unit 304 outputs the obtained restriction amount information to the DL-SA selection unit 305 and outputs the obtained restriction amount information to the conversion unit 1201. Limit amount calculation section 304 outputs nothing when the total value of received power resources is equal to or less than the received power resource for uplink packets.

  The conversion unit 1201 converts the resource limit amount into the transmission rate or the number of information bits based on the limit amount information input from the limit amount calculation unit 304. Then, conversion section 1201 outputs the converted transmission rate information or information bit number information to channel encoding section 117 as downlink control signal DL-SR. For example, the conversion unit 1201 divides the transmission rate or the number of information bits into a plurality of levels, stores a table storing conversion information that associates the resource limit amount and the level change width, and stores the limit amount calculation unit 304. The level change width is selected by referring to the conversion information using the information on the amount of restriction input from. Since the communication device and the communication terminal device store the same conversion information, the communication terminal device that has received the downlink control signal DL-SR transmits the transmission rate or information based on the downlink control signal DL-SR. The number of bits or transmission power or transmission power offset can be changed.

  FIG. 13 is a diagram illustrating a state in which the transmission rate is divided into eight levels. FIG. 14 is a diagram showing a state in which the number of information bits is divided into eight levels.

  FIG. 15 is a diagram illustrating downlink DL-SR, and is commonly applied to both the downlink control signal DL-SR indicating the transmission rate and the downlink control signal DL-SR indicating the number of information bits. it can. The received power resource limit “0”, that is, the downlink control signal DL-SR indicating that the level is not lowered is “00”, and the received power resource limit “x1”, that is, the lower level indicating that the level is lowered. The line control signal DL-SR is “01”, and the received power resource limit amount “x2”, that is, the downlink control signal DL-SR indicating that the level is lowered by two is “10”, and the received power resource limit amount “X3”, that is, the downlink control signal DL-SR indicating that the level is lowered by 3 is “11”. FIG. 15 shows a case where the downlink control signal DL-SR is transmitted even when the resource is not limited. However, when the resource is not limited, the downlink control signal DL-SR is not transmitted. May be.

  FIG. 16 is a diagram illustrating another example of the downlink control signal DL-SR, in the case of the downlink control signal DL-SR indicating the transmission rate and the case of the downlink control signal DL-SR indicating the number of information bits. Applicable to both. The received power resource limit “0”, that is, the downlink control signal DL-SR indicating that the level is not lowered is “00”, and the received power resource limit “x1”, that is, the lower level indicating that the level is lowered. The line control signal DL-SR is “01” and the received power resource limit amount “x2”, that is, the downlink control signal DL-SR indicating that the level is lowered by two is “10”, and is a downlink that instructs retransmission stop. The line control signal DL-SR is “11”. FIG. 16 shows a case where the downlink control signal DL-SR is transmitted even when the resource is not limited. However, when the resource is not limited, the downlink control signal DL-SR is not transmitted. May be.

  As described above, according to the second embodiment, in addition to the effects of the first embodiment, the communication terminal apparatus that has received the downlink control signal DL-SR transmits transmission power and transmission power for another transmission rate. Since it is only necessary to switch to the setting of the offset, there is no need to recalculate the transmission power, a simple system can be achieved, and signal processing in the communication terminal apparatus can be accelerated.

  In the second embodiment, the downlink control signal DL-SR is used in order to accurately control the target value of the total received power of the base station. The downlink control signal DL-SR may be used to control the rate of transmission resource allocation. In this case, a more flexible system operation can be performed.

(Embodiment 3)
FIG. 17 is a block diagram showing a configuration of communication apparatus 1700 according to Embodiment 3 of the present invention.

  As shown in FIG. 17, communication apparatus 1700 according to Embodiment 3 includes scheduling section 1701 instead of scheduling section 115 in communication apparatus 100 according to Embodiment 1 shown in FIG. 1. In FIG. 17, parts having the same configuration as in FIG.

  The SIR measurement unit 104 measures the SIR using the pilot signal included in the received signal input from the despreading unit 103 and outputs the measured SIR measurement value information to the TPC generation unit 105 and the scheduling unit 1701.

  Scheduling section 1701 receives SIR measurement value information input from SIR measurement section 104 of received signal processing sections 136-1 to 136-n, ACK signal or NACK signal input from error detection section 111, and channel decoding section 114. Input uplink control signal UL-SI, rate combination information that is information of transmission rate candidates stored in advance in a storage unit (not shown), and reception power for uplink packets that is the maximum resource that can be allocated to the communication terminal device Scheduling is performed based on the resource information, and resources are allocated to each communication terminal device. Scheduling section 1701 then outputs resource information of each allocated communication terminal apparatus as downlink control signal DL-SA to channel encoding section 121, and the resource allocated to the communication terminal apparatus scheduled for retransmission is received for uplink packets. When the power resource is exceeded, a common resource restriction amount is assigned to the communication terminal device scheduled to be retransmitted, and the information on the assigned common restriction amount is channel-decoded as a downlink control signal DL-SR (Down Link Scheduling Restriction). To the unit 117. At this time, the scheduling unit 1701 counts the number of transmissions of each communication terminal device, performs grouping based on the number of transmissions, and assigns a common limit amount for each group. Details of the scheduling unit 1701 will be described later.

  Channel encoding section 117 encodes transmission data including downlink control signal DL-SR input from scheduling section 1701 and outputs the encoded transmission data to modulation section 118.

  Channel encoding section 121 encodes transmission data including downlink control signal DL-SA input from scheduling section 1701 and outputs the encoded transmission data to modulation section 122.

  Next, details of the configuration of the scheduling unit 1701 will be described with reference to FIG. FIG. 18 is a block diagram illustrating a configuration of the scheduling unit 1701. As shown in FIG. 18, the scheduling unit 1701 according to the third embodiment adds a grouping processing unit 1801 to the scheduling unit 115 according to the first embodiment shown in FIG. In FIG. 18, parts having the same configuration as in FIG.

  The grouping processing unit 1801 counts the number of transmissions for each communication terminal device from the ACK signal or NACK signal input from the error detection unit 111, and groups the communication terminal devices for each transmission number. Then, grouping processing section 1801 outputs grouping information to retransmission credit received power resource calculation section 303.

  Retransmission received power resource calculation section 303 receives the SIR measurement result of each communication terminal device input from SIR measurement section 104, downlink control signal DL-SA at the time of initial transmission input from DL-SA storage section 302, and grouping Based on the grouping information input from the processing unit 1801, the total power resource required by all communication terminal apparatuses scheduled to be retransmitted is calculated. Retransmission credit received power resource calculation section 303 then sends the total value of power resources required by all communication terminal apparatuses scheduled for retransmission grouped according to the number of transmissions to control amount calculation section 304 and DL-SA selection section 305. Output.

  The limit amount calculation unit 304 determines whether or not the total value of the reception power resources required by all the communication terminal devices scheduled to be retransmitted input from the retransmission credit reception power resource calculation unit 303 is equal to or less than the reception power resource for uplink packets. Determine whether. When the total value of the reception power resources exceeds the reception power resource for uplink packets, the limit amount calculation unit 304 calculates the amount exceeding the reception power resource for uplink packets (for example, xdB), and In order not to exceed the received power resource, a limit amount for limiting the received power resource is allocated to each communication terminal apparatus scheduled to be retransmitted in each group. Specifically, the limit amount calculation unit 304 plans to retransmit the xdB so that the limit amount of the received power resource of each communication terminal device scheduled for retransmission is the same in each communication terminal device scheduled for retransmission. This is the limit amount of each communication terminal device. Then, the limit amount is allocated to each communication terminal device scheduled to be retransmitted. Then, the restriction amount calculation unit 304 outputs the obtained restriction amount information for each group to the DL-SA selection unit 305, and channel encodes the obtained restriction amount information for each group as a downlink control signal DL-SR. To the unit 117. Limit amount calculation section 304 outputs nothing when the total value of received power resources is equal to or less than the received power resource for uplink packets.

  FIG. 19 shows a case where a group G1 of communication terminal devices having a transmission count of two or more and less than a threshold N and a group G2 of communication terminal devices having a transmission count of N or more are divided into two groups. It is a figure which shows the downlink control signal DL-SR. The downlink control signal DL-SR in this case indicates a limit amount with respect to a transmission power offset at the time of initial transmission of each communication terminal apparatus, that is, an offset with respect to a reference channel such as DPCCH. In both communication terminals of the group G1 and the group G2, the downlink control signal DL-SR indicating the limit “0” for the offset of the received power resource is “00”, and the limit “1” for the offset of the received power resource. The downlink control signal DL-SR indicating "is" 01 ", the downlink control signal DL-SR indicating the limit amount" 2 "for the offset of the received power resource is" 10 ", and the offset for the received power resource is The downlink control signal DL-SR indicating the limit amount “3” is “11”. FIG. 19 shows the case where the downlink control signal DL-SR is transmitted even when the resource is not limited. However, when the resource is not limited, the downlink control signal DL-SR is not transmitted. May be.

  FIG. 20 is a diagram illustrating downlink DL-SR when grouping is performed for each transmission count. The downlink control signal DL-SR in this case indicates a limit amount with respect to a transmission power offset at the time of initial transmission of each communication terminal apparatus, that is, an offset with respect to a reference channel such as DPCCH. In each group of communication terminal apparatuses, the downlink control signal DL-SR indicating the limit “0” for the offset of the received power resource is “00”, and the downlink indicating the limit “1” for the offset of the received power resource. The control signal DL-SR is “01”, the downlink control signal DL-SR indicating the limit “2” for the offset of the received power resource is “10”, and the limit “3” for the offset of the received power resource. The downlink control signal DL-SR indicating “11” is “11”. FIG. 20 shows a case where the downlink control signal DL-SR is transmitted even when the resource is not limited. However, when the resource is not limited, the downlink control signal DL-SR is not transmitted. May be.

  Thus, according to the third embodiment, in addition to the effects of the first embodiment, resources can be allocated by weighting according to the number of transmissions, so that the efficiency of the system can be improved.

  In the third embodiment, the downlink control signal DL-SR for each group is transmitted. However, the present invention is not limited to this, and the downlink control signals for each group are collectively encoded and transmitted. May be. Further, in Embodiment 3, the downlink control signal DL-SR is used to accurately control the target value of the total received power of the base station. The downlink control signal DL-SR may be used to control the rate of transmission resource allocation. In this case, a more flexible system operation can be performed.

(Embodiment 4)
FIG. 21 is a block diagram showing a configuration of communication apparatus 2100 according to Embodiment 4 of the present invention.

  The communication apparatus 2100 according to the fourth embodiment includes a scheduling unit 2101 instead of the scheduling unit 115 in the communication apparatus 100 according to the first embodiment illustrated in FIG. In FIG. 21, parts having the same configuration as in FIG.

  SIR measurement section 104 measures SIR using a pilot signal included in the received signal input from despreading section 103, and outputs the measured SIR measurement value information to TPC generation section 105 and scheduling section 2101.

  Scheduling section 2101 receives SIR measurement value information input from SIR measurement sections 104 of received signal processing sections 136-1 to 136-n, ACK signal or NACK signal input from error detection section 111, and channel decoding section 114. Input uplink control signal UL-SI, rate combination information that is information of transmission rate candidates stored in advance in a storage unit (not shown), and reception power for uplink packets that is the maximum resource that can be allocated to the communication terminal device Scheduling is performed based on the resource information, and resources are allocated to each communication terminal device. Scheduling section 2101 then outputs resource information of each allocated communication terminal apparatus to channel encoding section 121 as downlink control signal DL-SA, and the resource allocated to the communication terminal apparatus scheduled for retransmission is received for uplink packets. When the power resource is exceeded, a common resource restriction amount is assigned to the communication terminal device scheduled to be retransmitted, and the information on the assigned common restriction amount is channel-decoded as a downlink control signal DL-SR (Down Link Scheduling Restriction). To the unit 117. At this time, the scheduling unit 2101 groups each communication terminal device scheduled to be retransmitted into a plurality of groups based on the grouping information, and assigns a common limit amount for each group. Details of the scheduling unit 2101 will be described later.

  Channel encoding section 117 encodes transmission data including downlink control signal DL-SR input from scheduling section 2101, and outputs the encoded transmission data to modulation section 118.

  Channel encoding section 121 encodes transmission data including downlink control signal DL-SA input from scheduling section 2101 and outputs the encoded transmission data to modulating section 122.

  Next, details of the configuration of the scheduling unit 2101 will be described with reference to FIG. FIG. 22 is a block diagram showing the configuration of the scheduling unit 2101. As shown in FIG. As shown in FIG. 22, the scheduling unit 2101 according to the fourth embodiment adds a grouping processing unit 2201 to the scheduling unit 115 according to the first embodiment shown in FIG. In FIG. 22, parts having the same configuration as in FIG.

  The grouping processing unit 2201 selects a communication terminal device scheduled for retransmission from the ACK signal or NACK signal input from the error detection unit 111, and selects the selected communication terminal device scheduled for retransmission into a plurality of groups based on the grouping information. Divide into groups. Then, grouping processing section 2201 outputs grouping information to retransmission credit received power resource calculation section 303. Here, the grouping information is uplink packet transmission time interval (TTI) information, channel priority information, queue number information, or information on whether or not the communication terminal apparatus is in a soft handover state.

  Retransmission received power resource calculation section 303 receives the SIR measurement result of each communication terminal device input from SIR measurement section 104, downlink control signal DL-SA at the time of initial transmission input from DL-SA storage section 302, and grouping Based on the grouping information input from the processing unit 2201, the total power resource required by all the communication terminal devices scheduled to be retransmitted is calculated. Retransmission credit received power resource calculation section 303 then sends the total value of power resources required by all communication terminal apparatuses scheduled for retransmission grouped according to the number of transmissions to control amount calculation section 304 and DL-SA selection section 305. Output.

  The limit amount calculation unit 304 determines whether or not the total value of the reception power resources required by all the communication terminal devices scheduled to be retransmitted input from the retransmission credit reception power resource calculation unit 303 is equal to or less than the reception power resource for uplink packets. Determine whether. When the total value of the reception power resources exceeds the reception power resource for uplink packets, the limit amount calculation unit 304 calculates the amount exceeding the reception power resource for uplink packets (for example, xdB), and In order not to exceed the received power resource, a limit amount for limiting the received power resource is allocated to each communication terminal apparatus scheduled to be retransmitted in each group. Specifically, the limit amount calculation unit 304 plans to retransmit the xdB so that the limit amount of the received power resource of each communication terminal device scheduled for retransmission is the same in each communication terminal device scheduled for retransmission. This is the limit amount of each communication terminal device. Then, the limit amount is allocated to each communication terminal device scheduled to be retransmitted. Then, the restriction amount calculation unit 304 outputs the obtained restriction amount information for each group to the DL-SA selection unit 305, and channel encodes the obtained restriction amount information for each group as a downlink control signal DL-SR. To the unit 117. Limit amount calculation section 304 outputs nothing when the total value of received power resources is equal to or less than the received power resource for uplink packets. Note that the downlink control signal DL-SR indicates the number of transmissions, the transmission time interval (TTI) information of the uplink packet, the channel priority information, the queue number information, or whether the communication terminal apparatus is in the soft handover state. Since it is the same as FIG. 19 and FIG. 20 except that the information is replaced with grouping information, the description thereof is omitted.

  Thus, according to the fourth embodiment, in addition to the effects of the first embodiment, resources can be allocated by weighting according to grouping information, so that the efficiency of the system can be improved. Also, according to the fourth embodiment, when the grouping information is information on the transmission time interval of the uplink packet, the resources allocated to the communication terminal apparatus can be adjusted according to the transmission time interval, so that flexible system operation It can be performed. Also, according to the fourth embodiment, when the grouping information is channel priority information, for example, many resources can be allocated to a group that requires high real-time characteristics, so that QoS is considered. System operation can be performed. Further, according to the fourth embodiment, when the grouping information is queue number information, the system operation considering QoS can be performed. Further, according to the fourth embodiment, when the grouping information is information indicating whether or not the communication terminal apparatus is in the soft handover state, for example, resources allocated to the communication terminal apparatus in the soft handover state are reduced. Therefore, the amount of interference given to other cells can be reduced, and the system can be operated stably.

  In the fourth embodiment, the downlink control signal DL-SR for each group is transmitted. However, the present invention is not limited to this, and the downlink control signals for each group are collectively encoded and transmitted. May be. Further, in Embodiment 4, the downlink control signal DL-SR is used to accurately control the target value of the total received power of the base station. The downlink control signal DL-SR may be used to control the rate of transmission resource allocation. In this case, a more flexible system operation can be performed.

(Embodiment 5)
FIG. 23 is a block diagram showing a configuration of scheduling section 115 according to Embodiment 5 of the present invention.

  As shown in FIG. 23, scheduling section 115 according to Embodiment 5 is the same as scheduling reception power for scheduling except for retransmission credit received power resource calculation section 303 in scheduling section 115 according to Embodiment 1 shown in FIG. A resource calculation unit 2301 is added. In FIG. 23, parts having the same configuration as in FIG.

  The DL-SA storage unit 302 stores the downlink control signal DL-SA at the time of initial transmission in each communication terminal apparatus input from the DL-SA selection unit 305. The DL-SA storage unit 302 stores the downlink control signal DL-SA for a predetermined time, and discards the stored downlink control signal DL-SA after a predetermined time has elapsed. Also, the DL-SA storage unit 302 outputs the downlink control signal DL-SA stored at the timing of scheduling to the scheduled received power resource calculation unit 2301.

  The scheduled received power resource calculation unit 2301 receives the SIR measurement result of each communication terminal apparatus 100 input from the SIR measurement unit 104 and the downlink control signal DL-SA at the initial transmission input from the DL-SA storage unit 302. Based on the above, the total power resource required by all the communication terminal devices is calculated. Then, the scheduled reception power resource calculation unit 2301 outputs the total value of the power resources required by all the communication terminal devices scheduled to be transmitted to the control amount calculation unit 304 and the DL-SA selection unit 305.

  The limit amount calculation unit 304 determines whether or not the total value of the reception power resources required by all the communication terminal devices scheduled to be transmitted input from the scheduled reception power resource calculation unit 2301 is equal to or less than the reception power resource for uplink packets. Determine whether. When the total value of the reception power resources exceeds the reception power resource for uplink packets, the limit amount calculation unit 304 calculates the amount exceeding the reception power resource for uplink packets (for example, xdB), and In order not to exceed the received power resource, a limit amount for limiting the received power resource is allocated to each communication terminal apparatus scheduled to be transmitted. Specifically, the limit amount calculation unit 304 transmits the limit amount of the received power resource of each communication terminal device scheduled to be transmitted by dividing the limit amount of the received power resource by the number of communication terminal devices scheduled to be transmitted. A limit amount that is the same in each scheduled communication terminal apparatus is assigned to each scheduled communication terminal apparatus. Limit amount calculation section 304 then outputs the allocated limit amount information to DL-SA selection section 305 and outputs the allocated limit amount information to channel encoding section 117 as downlink control signal DL-SR. Limit amount calculation section 304 outputs nothing when the total value of received power resources is equal to or less than the received power resource for uplink packets. Further, the limit calculation unit 304 generates a downlink control signal DL-SR for limiting the resource indicated by the downlink control signal DL-SA that is effective within a predetermined time, and generates the generated downlink control. Signal DL-SR is output to channel encoding section 117.

  The DL-SA selection unit 305 receives the SIR measurement result input from the SIR measurement unit 104 and the channel decoding unit 114 when the information on the limit amount to be allocated to the communication terminal device scheduled to be transmitted is not input from the limit amount calculation unit 304. Based on the input uplink control signal UL-SI and the rate combination information, each communication is performed in the order of the terminal numbers arranged in the priority order input from the terminal selection unit 301 with resources below the reception power resource for uplink packets. A reception power resource is allocated to the terminal device. Then, DL-SA selecting section 305 outputs the allocated resource information to channel encoding section 121 as downlink control signal DL-SA that is valid for a predetermined time. Here, the downlink control signal DL-SA that is valid for a predetermined time is the downlink control signal DL-SA that is generated and transmitted at the beginning of the predetermined time, and is predetermined unless a new resource allocation instruction is received. This is a downlink control signal DL-SA that is not changed in time.

  In addition, when the information on the restriction amount of the resource to be allocated to the communication terminal device scheduled to be transmitted is input from the restriction amount calculation unit 304, the DL-SA selection unit 305 receives the SIR measurement result, the channel, Subtracting the resource limit amount input from the limit amount calculation unit 304 from the resource of each communication terminal device scheduled to be transmitted based on the uplink control signal UL-SI input from the decoding unit 114 and the rate combination information, The reception power resource is allocated to each communication terminal apparatus in the order of the terminal numbers arranged in the order of priority input from the terminal selection unit 301 with resources equal to or lower than the reception power resource for uplink packets. Then, DL-SA selecting section 305 outputs the allocated resource information to channel encoding section 121 as downlink control signal DL-SA.

  Next, the signaling method will be described with reference to FIG. FIG. 24 is a flowchart showing a signaling method.

  First, scheduling section 115 does not transmit downlink control signal DL-SA or transmits downlink control signal DL-SR to a communication terminal apparatus that has transmitted DL-SA as a downlink control signal. It is determined whether or not there is a communication terminal device that has not passed a predetermined time (step ST2401). When there is a communication terminal device for which the predetermined time has not elapsed, the scheduling unit 115 determines whether or not the total value of the reception power resources allocated to each communication terminal device scheduled to be transmitted is equal to or less than the reception power resource for uplink packets. Is determined (step ST2402).

  When the total value of the reception power resources allocated to each communication terminal apparatus scheduled to be transmitted is not less than or equal to the reception power resource for uplink packets, scheduling section 115 notifies the limit amount of the resources allocated to each communication terminal apparatus scheduled to transmit The downlink control signal DL-SR to be generated is generated (step ST2403). Next, after the processing of the communication terminal apparatus for which the predetermined time has not elapsed, the scheduling unit 115 allocates resources to the communication terminal apparatus to which resources are not allocated and generates the downlink control signal DL-SA. (Step ST2404). Next, the communication terminal apparatus transmits the generated downlink control signal DL-SR and downlink control signal DL-SA (step ST2405). Note that the downlink control signal DL-SR is generated only for the communication terminal apparatus selected in step ST2401 and step ST2402.

  On the other hand, when there is no communication terminal apparatus for which the predetermined time has not elapsed in step ST2401, scheduling section 115 generates only downlink control signal DL-SA without generating downlink control signal DL-SR. (Step ST2404). Also, in step ST2402, when the total value of the reception power resources allocated to each communication terminal apparatus scheduled to be transmitted is equal to or less than the reception power resource for uplink packets, scheduling section 115 generates downlink control signal DL-SR. Without generating only the downlink control signal DL-SA (step ST2404).

  FIG. 25 is a diagram illustrating signaling by the downlink control signal DL-SA. 25, the signaling indicating the transmission power offset “y1” is “000”, the signaling indicating the transmission power offset “y2” is “001”, and the signaling indicating the transmission power offset “y3” is “010”. is there. The signaling indicating the effective period NTTI of the downlink control signal DL-SA is “00”, the signaling indicating the effective period 2NTTI of the downlink control signal DL-SA is “01”, and the downlink control signal DL− The signaling indicating the SA validity period 4NTTI is “10”, and the signaling indicating the validity period 8NTTI of the downlink control signal DL-SA is “11”. Scheduling section 115 selects signaling according to the scheduling result from signaling # 2501 indicating the transmission power offset, and selects predetermined signaling from signaling # 2502 indicating the valid period of downlink control signal DL-SA. Scheduling section 115 then outputs downlink control signal DL-SA including signaling indicating the selected transmission power offset and signaling indicating the valid period of downlink control signal DL-SA.

  FIG. 26 is a diagram illustrating signaling by the downlink control signal DL-SR. The downlink control signal DL-SR in this case indicates the limit amount for the offset amount set by the transmission parameter setting section 226 of each communication terminal device, that is, the limit amount for the offset value of the resource of a specific channel such as DPCCH. Is. The downlink control signal DL-SR indicating the restriction amount “0” for the offset value of the transmission power resource is “00”, and the downlink control signal DL-SR indicating the restriction amount “1” for the offset value of the transmission power resource is The downlink control signal DL-SR that is “01” and indicates the limit “2” for the offset value of the transmission power resource is “10”, and the downlink that indicates the limit “3” for the offset value of the transmission power resource The control signal DL-SR is “11”. FIG. 26 shows a case where the downlink control signal DL-SR is transmitted even when the resource is not limited. However, when the resource is not limited, the downlink control signal DL-SR is not transmitted. May be.

  As described above, according to the fifth embodiment, the common limit amount from the resources allocated by the downlink control signal DL-SA based on the reception quality of the communication terminal apparatus scheduled to be transmitted is set to the communication terminal apparatus for a predetermined time. Since the downlink control signal DL-SA is transmitted as information on the common limit amount to the communication terminal apparatus scheduled to be transmitted, the target value of the total received power is allocated. Thus, it is possible to achieve both the accurate control of the communication and the amount of the downlink control signal, and it is possible to prevent the throughput of the uplink and the downlink from being lowered.

  In the fifth embodiment, the effective period is notified by signaling with the downlink control signal DL-SA. However, the present invention is not limited to this, and the number of scheduling is notified by signaling with the downlink control signal DL-SA. Thus, the downlink control signal DL-SA may be transmitted every time the notified number of times of scheduling ends.

  In the first to fifth embodiments, the values signaled by the downlink control signal DL-SA are the four values “00”, “01”, “10”, and “11”. The value can be any value. In the first to fifth embodiments, the transmission power, the transmission rate, or the number of information bits is signaled to the communication terminal apparatus. However, the present invention is not limited to this, and may be related to the resource limit amount. Any information such as the MCS level can be signaled. In the first to fifth embodiments, the downlink control signal DL-SA and the downlink control signal DL-SR are subjected to separate transmission processing. However, the present invention is not limited to this, and downlink control is performed. The signal DL-SA and the downlink control signal DL-SR may be subjected to common transmission processing. Further, the resource allocated by the downlink control signal DL-SA is limited by one downlink control signal DL-SR, but not limited thereto, a value obtained by adding a plurality of downlink control signals DL-SR. May limit the resources allocated by the downlink control signal DL-SA. Moreover, the communication apparatus of the said Embodiment 1-Embodiment 5 is applicable to a base station apparatus. In the first to fifth embodiments, the downlink control signal DL-SR is generated and transmitted only when the resource needs to be limited. However, the present invention is not limited to this, and the resource is limited. Regardless of whether or not it is necessary, the downlink control signal DL-SR may be generated and transmitted for each scheduling.

  INDUSTRIAL APPLICABILITY The communication apparatus, base station apparatus, and signaling method according to the present invention can achieve both correct control and reducing the amount of downlink control signals, and have the effect of preventing a decrease in downlink throughput. And is useful for scheduling.

The block diagram which shows the structure of the communication apparatus which concerns on Embodiment 1 of this invention. The block diagram which shows the structure of the communication terminal device which concerns on Embodiment 1 of this invention. The block diagram which shows the structure of the scheduling part which concerns on Embodiment 1 of this invention. The flowchart which shows operation | movement of the communication apparatus which concerns on Embodiment 1 of this invention, and a communication terminal device. The flowchart which shows operation | movement of the communication apparatus which concerns on Embodiment 1 of this invention, and a communication terminal device. The figure which shows the transmission / reception timing of the signal in the case of the retransmission which concerns on Embodiment 1 of this invention The figure which shows the received power which concerns on Embodiment 1 of this invention. The figure which shows the downlink control signal DL-SR which concerns on Embodiment 1 of this invention. The figure which shows the downlink control signal DL-SR which concerns on Embodiment 1 of this invention. The figure which shows the downlink control signal DL-SR which concerns on Embodiment 1 of this invention. The figure which shows the downlink control signal DL-SR which concerns on Embodiment 1 of this invention. The block diagram which shows the structure of the scheduling part which concerns on Embodiment 2 of this invention. The figure which shows the transmission rate divided into the several level based on Embodiment 2 of this invention The figure which shows the information bit number divided into the several level based on Embodiment 2 of this invention The figure which shows the downlink control signal DL-SR which concerns on Embodiment 2 of this invention. The figure which shows the downlink control signal DL-SR which concerns on Embodiment 2 of this invention. The block diagram which shows the structure of the communication apparatus which concerns on Embodiment 3 of this invention. The block diagram which shows the structure of the scheduling part which concerns on Embodiment 3 of this invention. The figure which shows the downlink control signal DL-SR which concerns on Embodiment 3 of this invention. The figure which shows the downlink control signal DL-SR which concerns on Embodiment 3 of this invention. The block diagram which shows the structure of the communication apparatus which concerns on Embodiment 4 of this invention. FIG. 9 is a block diagram showing a configuration of a scheduling unit according to Embodiment 4 of the present invention. FIG. 7 is a block diagram showing a configuration of a scheduling unit according to Embodiment 5 of the present invention. Flow chart showing a signaling method according to Embodiment 5 of the present invention. The figure which shows the downlink control signal DL-SA which concerns on Embodiment 5 of this invention. The figure which shows the downlink control signal DL-SR which concerns on Embodiment 5 of this invention. Diagram showing scheduling method The figure which shows the transmission / reception timing of the signal in the case of the conventional retransmission Figure showing conventional received power The figure which shows the transmission / reception timing of the signal in the case of the conventional retransmission Figure showing conventional received power

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Communication apparatus 104 SIR measurement part 107,110,114 Channel decoding part 111 Error detection part 115 Scheduling part 116,125,130 Transmission power setting part 117,121,126,131 Channel encoding part

Claims (12)

Scheduling means for allocating resources common to the communication partner for allocating resources to the communication partner based on reception quality and for limiting the resource to the communication partner;
A notification means for transmitting information on the resources allocated by the scheduling means to the communication partner and transmitting information on the common resource restriction amount to the communication partner that has transmitted the resource information;
A communication apparatus comprising: Comprising error detection means for detecting errors in received data;
The scheduling means allocates the common resource limit amount to a communication partner in which an error is detected by the error detection means,
2. The communication apparatus according to claim 1, wherein the notifying unit transmits the common resource limit amount information to a communication partner in which an error is detected by the error detecting unit.   3. The communication apparatus according to claim 1, wherein the scheduling unit assigns the common resource limit amount from resources assigned at the time of initial transmission to a communication partner.   The communication device according to any one of claims 1 to 3, wherein the scheduling unit allocates the common resource limit amount from a resource offset value of a specific channel allocated to a communication partner. . The scheduling means converts the common resource limit amount allocated to a communication partner into a transmission rate or the number of information bits,
The notification means transmits the information on the transmission rate or the information on the number of information bits converted by the scheduling means to the communication partner as information on the common resource limit amount. Item 5. The communication device according to any one of Item 4. The scheduling means divides communication partners into a plurality of groups and assigns the common resource limit amount for each group,
The communication apparatus according to claim 1, wherein the notification unit transmits information on the common resource limit amount for each group to a communication partner.   The scheduling means allocates a resource that is effective at a predetermined time to the communication partner, and allocates the common resource limit amount for limiting the allocated resource within the predetermined time. The communication apparatus according to claim 6.   A base station apparatus comprising the communication apparatus according to claim 1. A communication terminal device that communicates with the communication device according to claim 1,
The communication terminal device
Resource setting means for setting a resource limited by the limit specified by the common resource limit information from the resource specified by the resource information;
Transmitting means for transmitting packet data using the resource set by the resource setting means;
A communication terminal apparatus comprising: Allocating resources common to the communication partner for allocating resources to the communication partner based on reception quality and limiting the resource to the communication partner;
Transmitting the information of the allocated resource to the communication partner and transmitting the information on the common resource limit amount to the communication partner that has transmitted the resource information;
A signaling method comprising: Detecting a received data error;
Assigning the common resource limit to the communication partner in which an error is detected;
The signaling method according to claim 10, wherein the common resource limit amount information is transmitted to a communication partner in which an error is detected. A communication system comprising: a communication device that transmits information on resources allocated based on reception quality; and a communication terminal device that transmits packet data using resources instructed by the resource information,
The communication device
A common resource restriction amount is assigned to the communication terminal device for restricting the resource, and the common resource restriction amount information is transmitted to the communication terminal device that has transmitted the resource information. And
The communication terminal device
A resource configured to set a resource limited by the limit specified by the common resource limit information from the resource indicated by the resource information, and transmit packet data using the set resource. system.

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