JP4800419B2 - RADIO RESOURCE ALLOCATION METHOD AND MOBILE COMMUNICATION SYSTEM USING THE SAME - Google Patents

Description

  The present invention relates to a radio resource allocation method and a mobile communication system to which the radio resource allocation method is applied, and in particular, a random access channel (RACH) and a data signal are multiplexed by FDM (frequency division multiplexing) or TDM (time division multiplexing). The present invention relates to a mobile communication system that uses a synchronous HARQ (Synchronous Hybrid Automatic Repeat Quest) method as a data signal retransmission control method.

The properties required for the uplink radio access scheme of the next-generation mobile communication system mainly include high frequency utilization efficiency and low peak-to-average power ratio (PAPR) of transmission signals.
A DFT (Discrete Fourier Transform) -Spread OFDM (Orthogonal Frequency Division Multiplexing) scheme is attracting attention as one of the radio access schemes that satisfy the above requirements. As a feature thereof, first, since it is a single carrier transmission system, PAPR is lower than that of a multicarrier system such as OFDM (Orthogonal Frequency Division Multiplexing).

  Another feature is that single-carrier signal components can be flexibly arranged in the time and frequency domains by using frequency domain signal processing.

  FIG. 1 shows an example of signal arrangement in the time and frequency domains. RACH (Random Access Channel) is a channel that has setting information for connection of a radio link in the uplink and is transmitted at the beginning of each radio frame.

  Therefore, a specific frequency region is provided as a radio resource I for RACH at regular time intervals. For the data signal II, the portion excluding the RACH radio resource is shared by each mobile station (UE1, UE2, etc.). There are originally control signals used for transmission of control information, data signals, pilot signals used for demodulation of control signals, etc., which are omitted in this figure.

  Here, as an error control method for data signals, a HARQ method based on the N-channel Stop and Wait method is premised, and when this is classified from the viewpoint of a retransmission interval, an asynchronous HARQ method and a synchronous HARQ method are obtained. (See Non-Patent Document 1 and Patent Document 1).

  In the asynchronous HARQ system, when a data signal is transmitted on the transmission side, a process number representing the order information of the data signal is transmitted as control information. On the receiving side, in order to restore the arrangement of the data signals to the original one, it is only necessary to refer to the process number, and therefore the retransmission interval is not necessarily constant. Therefore, when packet scheduling is performed on the transmission side, there is an advantage that the degree of freedom of scheduling is high.

On the other hand, in the synchronous HARQ system, the data signal retransmission interval is basically constant. On the receiving side, it is possible to determine for which new data retransmission data has been received without referring to the process number, so that the arrangement of the data signals can be restored to the original without any problem. Therefore, there is no need to transmit the process number as control information, and there is an advantage that the transmission efficiency of the data signal is improved.
“3rd generation partner project (3GPP); Technical Specification Group 3 TR4). JP 2007-6080 A

  Consider the operation of synchronous HARQ for a data signal when the RACH and the data signal are frequency division multiplexed or time division multiplexed. FIG. 2 shows an example of radio resource allocation for RACH and data signals. Here, since the allocation amount of the radio resource for the data signal is not necessarily the same in each TTI (Transmission Time Interval), the following problems arise.

  When all the data signals of each mobile station UE transmitted in TTI where RACH is not multiplexed are defective (CRC-NG) in the check bit determination, a certain time from the previous transmission timing, for example, timing TTI # (n) It is necessary to retransmit at the timing TTI # (n + RTT) that has passed (RTT: Round Trip Time).

  In FIG. 2, after one round-trip transmission time (RTT: Round Trip Time), data retransmission radio resources of all mobile stations can be secured at timing TTI # (n + RTT), but at timing TTI # (n + RTT + 1), the bandwidth for RACH Is set first, radio resources for data retransmission of UE2 cannot be secured. Therefore, when this timing overlaps with the TTI on which the RACH is multiplexed, radio resources necessary for retransmission cannot be secured, and synchronous HARQ cannot be realized.

  Further, as a countermeasure to the above problem, when it is expected that the TTI where the RACH is multiplexed and the retransmission timing of the data signal are expected to overlap, a method of delaying the retransmission timing of the data signal can be considered. However, there is a concern that the queue will become longer and the retransmission buffer will fail.

  Accordingly, an object of the present invention is to provide a radio resource allocation method that eliminates such inconvenience and a digital mobile communication system to which the radio resource allocation method is applied.

  As a feature of the present invention, first, RACH and a data signal are multiplexed by FDM (frequency division multiplexing) or TDM (time division multiplexing), and a synchronous HARQ (Synchronous Hybrid Automatic Repeat Request) is synchronized with the retransmission control method of the data signal. When the method is used, a channel that does not perform retransmission is provided in a time slot in which RACH is multiplexed.

  With this feature, the amount of radio resources allocated for data signals is the same for each TTI, and the above problem is solved.

  Also, in the digital mobile communication system according to the present invention, when the RACH and the data signal are multiplexed by FDM or TDM, and the synchronous HARQ scheme is used for the retransmission control scheme of the data signal, the time slot where the RACH is not multiplexed is the same as the RACH. A channel having a radio resource size of 2 is provided. With this feature, the amount of radio resources allocated for data signals is the same for each TTI, and the above problem is solved.

FIG. 1 is a diagram illustrating an example of radio resource allocation. FIG. 2 is a diagram for explaining radio resource allocation and retransmission control in a conventional example. FIG. 3 is a block diagram showing a configuration example of the mobile station in the first embodiment to which the present invention is applied, and particularly shows a configuration on the transmission side. FIG. 4 is a diagram illustrating a configuration example of a retransmission buffer in the mobile station configuration of FIG. FIG. 5 is a block diagram showing a configuration example of the base station in the first embodiment to which the present invention is applied, and particularly shows a configuration on the receiving side. FIG. 6 is a diagram for explaining radio resource allocation and retransmission control in the first embodiment. FIG. 7 is a diagram illustrating a configuration example of an RB allocation unit in the base station of FIG. FIG. 8 is a diagram for explaining radio resource allocation and retransmission control in the second embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 3 is a block diagram showing a configuration example of a mobile station UE (User Equipment) to which the present invention is applied, and particularly shows a configuration on the transmission side of the mobile station.

  In FIG. 3, the control signal demodulator 1 demodulates the control signal fed back from the base station BS received by the receiving antenna 18R, and ACK / NACK information 100, RB (Resource Block) allocation information 101, transmission timing described later. The control value 102 is extracted.

  The retransmission buffer unit 2 performs retransmission control of N-channel Stop and Wait. A detailed configuration example of the retransmission buffer unit 2 is shown in FIG.

  The retransmission buffer unit 2 has buffers 20 corresponding to the number of processes (process 1 to process Npro). In the buffer 20, the transmitted data is stored according to the process. In addition, this data includes information representing the data type (real time, non-real time, etc.).

  The retransmission control unit 21 controls input / output of signals in the buffer unit 20 based on ACK / NACK information 100 from a base station BS (Base Station) described later.

  For example, when the ACK / NACK information 100 indicates ACK, the retransmission control unit 21 instructs the write buffer selection unit 22 to write new data in the part of the process number corresponding to the ACK / NACK information 100 in the buffer 20. .

  Next, the read buffer selection unit 23 is instructed to read data from the buffer 20.

  When the ACK / NACK information 100 indicates NACK, the retransmission control unit 21 does not give a write instruction to the write buffer selection unit 22 and reads data of the process number corresponding to the ACK / NACK information 100 from the buffer 20. The read buffer selection unit 23 is instructed.

  Here, the time from when the data signal is transmitted until the ACK / NACK information 100 is returned is known as RTT (Round Trip Time). From this, the correspondence between the ACK / NACK information 100 and the process number is known.

  Further, the amount of data written, the amount of data read, and the target data type are included in the RB (Resource Block) allocation information 101 described above.

  Data read from the buffer 20 is transferred to a CRC (cyclic code check code) encoder 3. Further, scheduling request information 103 is transferred to the convolutional encoder 4 as a control signal. The scheduling request information 103 is generated based on the data amount of each data type staying in the buffer 20, for example.

  Next, the CRC encoder 3 performs error detection coding on the data signal, the turbo encoder 5 performs error correction coding, and the first data modulation unit 6 performs data modulation with the data signal. The control signal is subjected to error correction coding by the convolutional encoder 4 and the second data modulation unit 7 performs data modulation by the control signal.

  The pilot signal generator 8 generates a pilot signal necessary for demodulating the data signal.

  A RACH (Random Access Channel) generation unit generates a RACH signal.

  The selector 10 performs a switching process so that any of the data signal, control signal, pilot signal, and RACH signal is processed thereafter.

  For example, at the initial connection with the base station BS, switching is performed so as to transmit a RACH signal.

  When requesting the transmission permission of the data signal to the base station BS, the base station BS is switched to transmit the control signal and the pilot signal. Further, when RB allocation information indicating permission to transmit a data signal is sent from the base station BS, switching is performed so as to transmit a data signal or a pilot signal.

  A discrete Fourier transform (DFT) unit 11 performs conversion from the time domain to the frequency domain for the output signal switched and output by the selector 10. The SC (subcarrier) mapping unit 12 performs mapping to the input signal of the Fast Inverse Fourier Transform (IFFT) unit 13 so that the output signal of the selector 10 is transmitted by a predetermined RB.

  Here, RB (Resource Block) is the minimum unit of the frequency band used by each mobile station UE in the system frequency band, and constitutes one RB by bundling consecutive frequencies (subcarriers). is doing. The IFFT unit 13 converts a frequency domain signal into a time domain signal.

  The CP insertion unit 14 inserts a CP (Cyclic Prefix) in units of samples output from the IFFT unit 13. The transmission timing control unit 15 finely adjusts the transmission timing based on the transmission timing control value 102 notified from the base station BS. The transmission timing control value 102 is calculated so that the signal of each mobile station UE is received by the base station BS at the same timing.

  Next, the signal whose transmission timing is adjusted by the D / A converter 16 is D / A converted, and the transmission RF (radio frequency) unit 17 performs orthogonal modulation to convert the baseband signal into a radio frequency signal. , Transmitted from the transmitting antenna 18S.

  FIG. 5 shows a block diagram of a reception processing configuration on the base station BS side to which the present invention is applied.

  First, the reception RF unit 30 converts a radio frequency signal into a baseband signal and performs orthogonal demodulation on the signal transmitted from the mobile station UE received by the antenna 29R. Thereafter, the A / D converter 31 performs A / D conversion.

  The RACH detection unit 32 detects the RACH signal. The CP deletion unit 33 deletes the CP from the received signal at a predetermined timing (target reception timing), and extracts an effective signal component from each mobile station UE. At this time, if the reception timing of each path from each mobile station UE is within the CP length interval from the target reception timing, no interference occurs between the mobile stations.

  The path search unit 35 performs correlation calculation between the received signal and the replica of the transmission pilot signal of each mobile station UE in the time domain. Thereby, the reception timing (start point of the effective signal component) of each path is detected for each mobile station.

  And the difference of the reception timing of the head path | pass of each mobile station UE and the above-mentioned target reception timing is calculated | required, and it is set as a transmission timing control value. An FFT (Fast Fourier Transform) unit 34 converts a time domain signal into a frequency domain. The data / control / pilot signal separation unit 36 separates the data signal, control signal and pilot signal of each mobile station multiplexed by TDM (time division) or FDM (frequency division) from the received signal. Thereafter, the demodulation processing unit 40 performs demodulation processing on each mobile station UE.

  The channel estimation unit 41 performs correlation calculation between the received pilot signal and the replica of the transmitted pilot signal in the frequency domain for the subcarrier in which the pilot signal is arranged. Thereby, channel distortion in the frequency domain in the radio channel is estimated. That is, the channel estimation value is obtained. By using this channel estimation value and performing interpolation processing (linear interpolation or the like) in the time direction and frequency direction, channel estimation values of all subcarriers and all FFT blocks in the TTI are calculated.

  The SIR estimator 42 estimates the received SIR (signal-to-interference signal ratio) for each RB for the data signal using the channel estimation value before the interpolation process. As an example of the estimation method, for each RB for data signal, using the channel estimation value of the subcarrier in which the pilot signal of the target mobile station UE is arranged, the real part of the channel estimation value represented by a complex number The sum of the squares of the imaginary parts is regarded as the desired signal component S, the dispersion value in a plurality of symbols is regarded as the interference signal power I, and the ratio of S and I is the estimated value of the received SIR.

  For the data signal, the channel compensation unit 431 multiplies the received data signal by the corresponding channel compensation weight for the specific subcarrier and FFT block. As the channel compensation weight, for example, an MMSE weight W expressed by the following equation is used.

  Here, H represents a channel estimation value, and * represents a complex conjugate. N is a noise power estimated value, and is obtained by averaging the interference power I of each RB for data signals obtained in the process of obtaining the received SIR estimated value between RBs.

  The SC demapping unit 432 extracts an RB signal in which the data signal of the target mobile station UE is arranged from the received signal. The IDFT unit 433 converts the frequency domain data signal into a time domain signal, and the data demodulation unit 434 performs data modulation.

  The retransmission buffer unit 435 has a buffer corresponding to the number of processes, and stores data of a process in which an error is detected by a CRC decoder 438 described later. The packet synthesizing unit 436 takes out a signal of the same process as the data signal received this time from the retransmission buffer, and adds it (packet synthesis) to the data signal received this time in bit units. The data signal after the packet synthesis is stored in the buffer of the corresponding process in the retransmission buffer unit 435.

  The turbo decoder 437 performs error correction decoding. In the CRC decoder 438, error detection is performed, and when no error is detected, the restored data signal is output.

  The error detection result is output as an ACK / NACK signal 100. In the breakdown of the ACK / NACK signal 100, 1 representing ACK is stored when no error is detected, and 0 representing NACK is stored when an error is detected.

  The ACK / NACK signal 100 is input to the retransmission buffer unit 435, and in the case of ACK, the buffer of the corresponding process is reset (the contents are replaced with 0).

  As for the control signal, similarly to the data signal, the channel compensation unit 441 performs channel compensation, and the SC demapping unit 442 extracts the RB signal in which the control signal is arranged from the received signal. Further, the IDFT unit 443 converts the frequency domain control signal into a time domain signal, and the data demodulation unit 444 performs data demodulation.

  Thereafter, Viterbi decoder 445 performs error correction decoding to obtain scheduling request information from mobile station UE.

  The RB allocation unit 37 allocates an RB to be used for transmission of the next data signal from each mobile station using the received SIR estimation value, scheduling request information, and ACK / NACK information of each RB for data signals.

  As an example of the allocation method, there is a method of allocating an RB whose received SIR estimated value exceeds a prescribed threshold. A specific configuration of the RB allocation unit 37 will be described later.

  The control signal modulation unit 38 controls RB allocation information used for the next data signal transmission from each mobile station UE, the ACK / NACK signal 100 of each mobile station UE, and the transmission timing control value of each mobile station UE. The signal is mapped to a signal, transmitted from the transmission antenna 29S to each mobile station UE, and fed back.

  FIG. 6 is a diagram for explaining radio resource allocation and retransmission control as the first embodiment. The difference from FIG. 2 is that the TTI in which the RACH is multiplexed does not multiplex channels that require retransmission, but multiplexes channels that do not require retransmission.

  Examples of channels that do not require retransmission include a channel for VoIP (Voice over Internet Protocol).

  For channels that require retransmission, retransmission control is performed using only TTIs that are not multiplexed with RACH. For example, when the data signals of the mobile stations UE1 and UE2 transmitted in TTI # n both become defective (CRC-NG) in the check bit determination, the RTT (Round Trip Time) -th TTI # counted from the previous transmission Retransmission is performed at (n + RTT).

  However, when counting the TTI, the TTI with which the RACH is multiplexed is excluded. Therefore, when the data signals of the mobile stations UE1 and UE2 transmitted by TTI # (n + 1) are both CRC-NG, TTI # (n + RTT + 1) in which RACH is multiplexed is excluded and counted. Retransmission is performed at (n + RTT + 2).

  In this way, since the radio resource size that can be allocated to the channel that requires retransmission is always constant in the TTI used by the channel that requires retransmission, the problem that radio resources cannot be secured at the time of retransmission is solved.

  FIG. 7 shows a specific configuration diagram of the RB allocation unit 36 in the base station BS that realizes the above-described radio resource allocation and retransmission control.

  In the TTI in which the RACH shown in FIG. 6 is multiplexed, if radio resources excluding the RACH are defined as limited resource channels, the limited resource channel scheduler 360 allocates RBs in the limited resource channel. On the other hand, the general channel scheduler 361 performs RB allocation in a TTI in which RACH is not multiplexed. In these schedulers 360 and 361, reception SIR, scheduling request information, and ACK / NACK information are input, and RB used for the next transmission and information on the data type to be transmitted are output as RB allocation information.

  The scheduler input / output control unit 362 switches the input / output to the RB allocation unit 36 to either the limited resource channel scheduler 360 or the general channel scheduler 361.

  Specifically, when the ACK / NACK information is ACK, RB allocation is performed for new data from the mobile station UE. For example, in the scheduling request information, when the ratio of the data retention amount of the channels that do not need to be retransmitted out of the data retention amount of all data types exceeds a certain level, switching to the limited resource scheduler 360 is required, and retransmission is unnecessary. RB allocation is performed for each channel.

  In other cases, switching to the general channel scheduler 361 is performed. When the ACK / NACK information is NACK, the channel that requires retransmission is switched to the general channel scheduler 361, and the channel that does not require retransmission is not switched to any scheduler.

  FIG. 8 is a diagram for explaining radio resource allocation and retransmission control in the second embodiment.

  The difference from FIG. 2 is that a channel having the same radio resource as RACH (defined as a limited resource channel) is allocated in a TTI in which RACH is not multiplexed. In FIG. 8, the same frequency band as the RACH is assigned to the limited resource channel. However, if the number of RBs (resource blocks) to be assigned is the same as that of the RACH, the same frequency band is not necessarily required.

Also, retransmission control of the limited resource channel is performed using only the limited resource channel in TTIs (for example, TTI # (n + 1) to TTI # (n + RTT)) in which RACH is not multiplexed.
Accordingly, the TTI transmitted last time is used as a starting point, except for the TTI where the RACH is multiplexed, and retransmission is performed at the RTT-th TTI.

  At this time, if the channel to be retransmitted is a channel with a radio resource equal to or less than the number of RBs of the limited resource channel, the limited resource channel can be used for retransmission.

  On the other hand, retransmission control of channels that require retransmission, excluding RACH and limited resource channels, is performed using all TTIs regardless of whether or not RACH is multiplexed. Accordingly, the TTI transmitted last time is used as a starting point and the TTI including the RACH multiplexed is counted, and retransmission is performed at the RTT-th TTI.

  In this way, in the TTI used by the limited resource channel, the radio resource size that can be allocated to the limited resource channel is always constant. In addition, in TTI used by other channels that require retransmission, the radio resource size that can be allocated to other channels that require retransmission is always constant. Therefore, the problem that radio resources cannot be secured at the time of retransmission is solved.

  The RB allocating unit 36 in the base station BS that realizes the above radio resource allocation and retransmission control has the same configuration as that of the first embodiment (see FIG. 7), but the operation of the scheduler input / output control unit 362 is different. . Specifically, when the ACK / NACK information is ACK, RB allocation is performed for new data from the mobile station UE.

  For example, in the scheduling request information, when the ratio of the non-real-time data to the data retention amount of all data types becomes a certain value or when the data retention amount of all data types is small, the limited resource scheduler 360 is used. And RB allocation is performed for these data. In other cases, switching to the general channel scheduler 361 is performed.

  When the ACK / NACK information is NACK, the scheduler is switched to the previous RB allocation.

  With the above-described configuration of the present invention, both RACH transmission and Synchronous HARQ processing for a data signal can be achieved.

  The description of the above embodiments is for understanding the present invention, and the scope of protection of the present invention is not limited to these embodiments. It is intended to cover the claims and their equivalents.

(Appendix 1)
A plurality of mobile stations, and a base station that communicates with the plurality of mobile stations by radio,
Data signals from the plurality of mobile stations are multiplexed on a plurality of channels in the frequency direction to form time slots, and the time slots multiplexed in the frequency direction are time division multiplexed and transmitted to the base station. In addition, the base station separately receives and receives the frequency division multiplexed data signal for each time slot sent from the mobile station side, and when the reception of the data signal is poor, A mobile communication system requesting retransmission,
Random access channels transmitted for radio link connection are multiplexed in the time slots at predetermined time intervals,
In the time slot in which the random access channel is multiplexed, only a data signal that does not require retransmission is frequency-multiplexed,
When there is a retransmission request from the base station, the plurality of mobile stations frequency-multiplex the data signal requested for retransmission in a time slot other than the time slot in which the random access channel is multiplexed, resend,
A mobile communication system.

(Appendix 2)
In Appendix 1,
The mobile communication system according to claim 1, wherein the data signal that does not need to be retransmitted is an audio signal based on an Internet protocol.

(Appendix 3)
A plurality of mobile stations, and a base station that communicates with the plurality of mobile stations by radio,
Data signals from the plurality of mobile stations are multiplexed on a plurality of channels in the frequency direction to form time slots, and the time slots multiplexed in the frequency direction are time division multiplexed and transmitted to the base station. In addition, the base station separately receives and receives the frequency division multiplexed data signal for each time slot sent from the mobile station side, and when the reception of the data signal is poor, A mobile communication system requesting retransmission,
Random access channels transmitted for radio link connection are multiplexed in the time slots every predetermined time,
Providing a channel having the same radio resource as the random access channel in a time slot other than the time slot in which the random access channel is multiplexed;
The plurality of mobile stations transmit the data signal transmitted through the channel having the same radio resource as the random access channel to the channel having the same radio resource as the random access channel when there is a retransmission request from the base station. The data signal requested to be retransmitted is frequency-multiplexed and retransmitted to the base station.
A mobile communication system.

(Appendix 4)
The base station in a mobile communication system comprising a base station for wirelessly communicating with a plurality of mobile stations,
Multiplexed with a plurality of channels in the frequency direction to form a time slot, the time slots multiplexed in the frequency direction are time-division multiplexed, and receive data signals transmitted from the plurality of mobile stations;
When the reception of the data signal is bad, request retransmission to the corresponding mobile station,
Random access channels transmitted for radio link connection are multiplexed in the time slots at predetermined time intervals, and only data signals that do not require retransmission are included in the time slots in which the random access channels are multiplexed. When the retransmission request is made by frequency multiplexing, the data signal requested for retransmission is frequency-multiplexed and retransmitted from a corresponding mobile station to a time slot other than the time slot to which the random access channel is multiplexed. Receive,
A base station in a mobile communication system.

(Appendix 5)
In Appendix 4,
A base station in a mobile communication system, wherein the data signal that does not need to be retransmitted is an audio signal based on an Internet protocol.

(Appendix 6)
The base station in a mobile communication system comprising a base station for wirelessly communicating with a plurality of mobile stations,
Multiplexed with a plurality of channels in the frequency direction to form a time slot, the time slots multiplexed in the frequency direction are time-division multiplexed, and receive data signals transmitted from the plurality of mobile stations;
When the reception of the data signal is bad, request retransmission to the corresponding mobile station,
Random access channels transmitted for radio link connection are multiplexed in the time slots at predetermined time intervals, and the same as the random access channel in time slots other than the time slots in which the random access channels are multiplexed A channel having radio resources is provided;
When the retransmission request is made for a data signal transmitted on a channel having the same radio resource as that of the random access channel, the retransmission request that is frequency-multiplexed to a channel having the same radio resource as that of the random access channel is made. Receive data signals from the corresponding mobile station,
A base station in a mobile communication system.

(Appendix 7)
The mobile station in a mobile communication system comprising a base station for wirelessly communicating with a plurality of mobile stations,
A time signal is multiplexed by a plurality of channels in the frequency direction to form a time slot, and a data signal in which the time slot multiplexed in the frequency direction is time-division multiplexed is transmitted to the base station,
When the reception of the data signal at the base station is bad, retransmission of the corresponding data signal is requested,
Random access channels transmitted for radio link connection are multiplexed in the time slots at predetermined time intervals, and only data signals that do not require retransmission are included in the time slots in which the random access channels are multiplexed. When a retransmission request is made from the base station after being frequency-multiplexed, it is frequency-multiplexed to a time slot other than the time slot to which the random access channel is multiplexed, and the data signal requested for retransmission is retransmitted to the base station. Do,
A mobile station in a mobile communication system.

(Appendix 8)
In Appendix 7,
A mobile station in a mobile communication system, wherein the data signal that does not need to be retransmitted is an audio signal based on an Internet protocol.

(Appendix 9)
A mobile station in a mobile communication system that communicates with a base station wirelessly,
Multiplexing a plurality of channels in the frequency direction to form time slots, time-division multiplexing the time slots multiplexed in the frequency direction, and transmitting a data signal to the base station;
When the reception of the data signal at the base station is poor, a retransmission of the data signal is requested,
A random access channel transmitted for radio link connection is multiplexed in the time slot at predetermined time intervals, and the same radio as the random access channel is transmitted in a time slot other than the time slot in which the random access channel is multiplexed. A channel with resources is provided,
The data signal requested to be retransmitted is frequency-multiplexed to a channel having the same radio resource as the random access channel when a data signal transmitted on the channel having the same radio resource as the random access channel is received. To the base station,
A mobile station in a mobile communication system.

(Appendix 10)
A plurality of mobile stations, and a base station that communicates with the plurality of mobile stations by radio,
Data signals from the plurality of mobile stations are multiplexed on a plurality of channels in the frequency direction to form time slots, and the time slots multiplexed in the frequency direction are time division multiplexed and transmitted to the base station. In addition, the base station separately receives and receives the frequency division multiplexed data signal for each time slot sent from the mobile station side, and when the reception of the data signal is poor, A data signal retransmission method in a mobile communication system requesting retransmission,
In the plurality of mobile stations,
Multiplexing a random access channel transmitted for radio link connection in the time slot at predetermined time intervals;
In a time slot in which the random access channel is multiplexed, only a data signal that does not require retransmission is frequency-multiplexed;
When there is a retransmission request from the base station, the method comprises the step of frequency multiplexing the data signal requested for retransmission in a time slot other than the time slot in which the random access channel is multiplexed, and retransmitting the data signal to the base station.
A data signal retransmission method in a mobile communication system.

Claims (10)

A plurality of mobile stations, and a base station that communicates with the plurality of mobile stations by radio,
Data signals from the plurality of mobile stations are multiplexed on a plurality of channels in the frequency direction to form time slots, and the time slots multiplexed in the frequency direction are time division multiplexed and transmitted to the base station. In addition, the base station separately receives and receives the frequency division multiplexed data signal for each time slot sent from the mobile station side, and when the reception of the data signal is poor, A mobile communication system requesting retransmission,
Random access channels transmitted for radio link connection are multiplexed in the time slots at predetermined time intervals,
In the time slot in which the random access channel is multiplexed, only a data signal that does not require retransmission is frequency-multiplexed,
When there is a retransmission request from the base station, the plurality of mobile stations frequency-multiplex the data signal requested for retransmission in a time slot other than the time slot in which the random access channel is multiplexed, resend,
A mobile communication system. In claim 1,
The mobile communication system according to claim 1, wherein the data signal that does not need to be retransmitted is an audio signal based on an Internet protocol. A plurality of mobile stations, and a base station that communicates with the plurality of mobile stations by radio,
Data signals from the plurality of mobile stations are multiplexed on a plurality of channels in the frequency direction to form time slots, and the time slots multiplexed in the frequency direction are time division multiplexed and transmitted to the base station. In addition, the base station separately receives and receives the frequency division multiplexed data signal for each time slot sent from the mobile station side, and when the reception of the data signal is poor, A mobile communication system requesting retransmission,
A random access channel transmitted for radio link connection to a predetermined said time slot time between each interval are multiplexed,
Providing a channel having the same radio resource as the random access channel in a time slot other than the time slot in which the random access channel is multiplexed;
The plurality of mobile stations, when receiving a retransmission request from the base station, transmits the same radio resource as the random access channel to a data signal transmitted through a channel having the same or less radio resources as the random access channel. Frequency-multiplexed to the channel it has and retransmit to the base station,
A mobile communication system. The base station in a mobile communication system comprising a base station for wirelessly communicating with a plurality of mobile stations,
Multiplexed with a plurality of channels in the frequency direction to form a time slot, the time slots multiplexed in the frequency direction are time-division multiplexed, and receive data signals transmitted from the plurality of mobile stations;
When the reception of the data signal is bad, request retransmission to the corresponding mobile station,
Random access channels transmitted for radio link connection are multiplexed in the time slots at predetermined time intervals, and only data signals that do not require retransmission are included in the time slots in which the random access channels are multiplexed. When the retransmission request is made by frequency multiplexing, the data signal requested for retransmission is frequency-multiplexed and retransmitted from a corresponding mobile station to a time slot other than the time slot to which the random access channel is multiplexed. Receive,
A base station in a mobile communication system. In claim 4,
A base station in a mobile communication system, wherein the data signal that does not need to be retransmitted is an audio signal based on an Internet protocol. The base station in a mobile communication system comprising a base station for wirelessly communicating with a plurality of mobile stations,
Multiplexed with a plurality of channels in the frequency direction to form a time slot, the time slots multiplexed in the frequency direction are time-division multiplexed, and receive data signals transmitted from the plurality of mobile stations;
When the reception of the data signal is bad, request retransmission to the corresponding mobile station,
Random access channels transmitted for radio link connection are multiplexed in the time slots at predetermined time intervals, and the same as the random access channel in time slots other than the time slots in which the random access channels are multiplexed A channel having radio resources is provided;
Moving said when performing a retransmission request for the transmitted data signals on the random access channel the same or channel having fewer radio resources it applicable is frequency-multiplexed to the channel with the random access channel and the same radio resources Receive from the station,
A base station in a mobile communication system. The mobile station in a mobile communication system comprising a base station for wirelessly communicating with a plurality of mobile stations,
A time signal is multiplexed by a plurality of channels in the frequency direction to form a time slot, and a data signal in which the time slot multiplexed in the frequency direction is time-division multiplexed is transmitted to the base station,
When the reception of the data signal at the base station is bad, retransmission of the corresponding data signal is requested,
Random access channels transmitted for radio link connection are multiplexed in the time slots at predetermined time intervals, and only data signals that do not require retransmission are included in the time slots in which the random access channels are multiplexed. When a retransmission request is made from the base station after being frequency-multiplexed, it is frequency-multiplexed to a time slot other than the time slot to which the random access channel is multiplexed, and the data signal requested for retransmission is retransmitted to the base station. Do,
A mobile station in a mobile communication system. In claim 7,
A mobile station in a mobile communication system, wherein the data signal that does not need to be retransmitted is an audio signal based on an Internet protocol. A mobile station in a mobile communication system that communicates with a base station wirelessly,
Multiplexing a plurality of channels in the frequency direction to form time slots, time-division multiplexing the time slots multiplexed in the frequency direction, and transmitting a data signal to the base station;
When the reception of the data signal at the base station is poor, a retransmission of the data signal is requested,
A random access channel transmitted for radio link connection is multiplexed in the time slot at predetermined time intervals, and the same radio as the random access channel is transmitted in a time slot other than the time slot in which the random access channel is multiplexed. Provide a channel with resources,
When the retransmission request is made, a data signal transmitted through a channel having the same or less radio resource as the random access channel is frequency-multiplexed to a channel having the same radio resource as the random access channel, and the base station Send to,
A mobile station in a mobile communication system. A plurality of mobile stations, and a base station that communicates with the plurality of mobile stations by radio,
Data signals from the plurality of mobile stations are multiplexed on a plurality of channels in the frequency direction to form time slots, and the time slots multiplexed in the frequency direction are time division multiplexed and transmitted to the base station. In addition, the base station separately receives and receives the frequency division multiplexed data signal for each time slot sent from the mobile station side, and when the reception of the data signal is poor, A data signal retransmission method in a mobile communication system requesting retransmission,
In the plurality of mobile stations,
Multiplexing a random access channel transmitted for radio link connection in the time slot at predetermined time intervals;
In a time slot in which the random access channel is multiplexed, only a data signal that does not require retransmission is frequency-multiplexed;
When there is a retransmission request from the base station, the method comprises the step of frequency multiplexing the data signal requested for retransmission in a time slot other than the time slot in which the random access channel is multiplexed, and retransmitting the data signal to the base station.
A data signal retransmission method in a mobile communication system.

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