WO2003032566A1 - Procede de communication, systeme de communication et appareil de communication - Google Patents
Procede de communication, systeme de communication et appareil de communication Download PDFInfo
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- WO2003032566A1 WO2003032566A1 PCT/JP2001/008741 JP0108741W WO03032566A1 WO 2003032566 A1 WO2003032566 A1 WO 2003032566A1 JP 0108741 W JP0108741 W JP 0108741W WO 03032566 A1 WO03032566 A1 WO 03032566A1
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- Prior art keywords
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- receiving
- retransmission
- station
- frame
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1806—Go-back-N protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1887—Scheduling and prioritising arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1809—Selective-repeat protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1835—Buffer management
- H04L1/1845—Combining techniques, e.g. code combining
Definitions
- the present invention relates to a communication method, a communication system, and a communication device employing an ARQ (Automatic Repeat request) technology. More specifically, the present invention relates to an optimal channel allocation in 1 (transmitting side) to n (receiving side) communication. The present invention relates to a communication method, a communication system and a communication device for realizing (scheduling method).
- ARQ Automatic Repeat request
- Fig. 11 shows a communication system for realizing the conventional communication method, where 101 is a base station, 102-1, 102-2, 102-3, ..., 102-n are mobile stations. is there.
- 101 is a base station
- 102-1, 102-2, 102-3, ..., 102-n are mobile stations. is there.
- the scheduler is a function (scheduling) that assigns n pairs of communications to m channels.
- channels (1), (2) and (3) are assigned to mobile stations 102-1, 102-2 and 102-3, respectively.
- the mobile stations 102-4, 102-5, and 102-6 are assigned channel (1), channel (2), and channel (3), respectively. I guess.
- time t (3) and time t (4) the same assignment as at time t (1) and t (2) is performed, respectively. That is, in FIG. 12 (a), channels are sequentially allocated to each mobile station regardless of the transmission request data amount (traffic amount) for each mobile station. However, channels are not allocated to mobile stations that have no data to transmit.
- Fig. 12 (b) at time t (1) and time t (2), priority is given to the mobile station 102-2 and mobile station 102-4 that have a large amount of traffic.
- time t (3) and time t (4) channels are allocated not only to mobile stations 102-2, 102-4, but also to other mobile stations with a small traffic volume.
- the traffic volume for each mobile station changes between times t (1) and t (4), scheduling is performed again according to the traffic volume.
- the quality of a communication line may be degraded due to noise or interference from communication with other stations. For example, the quality may not be improved even when error correction technology is used.
- retransmission is performed by using ARQ technology to retransmit data units (hereinafter, referred to as frames) that could not be recovered by error correction.
- the ARQ includes SR (Selective Repeat), GBN (Go Back N), and SAW (Stop and Wait).
- FIG. 13 is a diagram for explaining SR-ARQ of one-to-one communication.
- the receiving station that detects the error of frame "2" transmits a retransmission request for frame "2", and stores frames "3" to "7" that were correctly received in the buffer. Then, when the retransmitted frame "2" is correctly received, it is transmitted to the upper layer in order.
- the receiving station reports the reception status periodically. Here, the latest number of consecutively received frames is reported. In the following, this report will be referred to as “reception notification”, and the dotted arrow in FIG. 13 indicates this.
- reception notification In the first reception notification, frame number "1" is reported because frame “2" is waiting for retransmission.
- frame number "8” In the second acknowledgment, frame number "8" is reported because retransmitted frame “2" and frames "3" to "7" were correctly received, and new frame "8” was also correctly received. I do.
- FIG. 14 is a diagram for explaining BGN-ARQ of one-to-one communication.
- everything after the frame where the transmission error occurred is retransmitted.
- the receiving station After transmitting the retransmission request for frame "2", the receiving station discards all received frames until the retransmitted frame "2" can be received correctly. On the other hand, the transmitting station retransmits all frames after the error frame "2".
- the receiving station performs acknowledgment in the same way as the above SR-ARQ, and reports the frame number "1" in the first acknowledgment and the frame number "3" in the second acknowledgment.
- FIG. 15 is a diagram for explaining SAW-ARQ of one-to-one communication.
- transmission is performed one frame at a time, and the next frame is transmitted after receiving notification of success (ACK) or failure (NAK) of reception for that frame.
- NAK is synonymous with retransmission request.
- FIG. 16 is a diagram showing the configuration of the base station shown in FIG. 11, where 1 1 1—1, 1 1 1—2,... .., 1 12—n is a transmission buffer, and 1 13 is a scheduler.
- Each transmission control unit and the corresponding transmission buffer exist independently for each mobile station (102_ :! to 102-n) that performs communication.
- the base station 101 transmits data sent from the upper layer. Store in buffer.
- each transmission control unit notifies the scheduler of the transmission request and the amount of data to be transmitted.
- the scheduler 113 preferentially assigns a channel to a mobile station in a high-quality line state based on the transmission request notified from each transmission control unit, the amount of data to be transmitted, and the line quality data of each communication. Assign. At this time, the line quality data to be referred It is the average value of the results of measurements performed multiple times by the mobile station.
- each mobile station when each mobile station receives a reception notification or an ACK notification from the mobile station, it is necessary to retransmit data corresponding to the frame number described in the notification and data before that frame number in the future. Erase from transmission buffer.
- the conventional transmission control unit may adopt general SR, BGN, and SAW as ARQ technology, or use S AW as in 3GPP HSDPA (High Speed Data Packet Access) technology.
- Nch (N channel) parallel with N units — even adopting S AW.
- the transmission efficiency is poor due to the time when the line is not used. Therefore, in the Nch-S AW, the same communication is divided into N channels and each transmission is independent. I do. For example, in Fig. 1-0, frame "0" is transmitted using the first channel, and in 3-1, frame "0" is transmitted using the third channel.
- FIG. 18 is a diagram for explaining a problem of the conventional technology.
- GBN-one ARQ is adopted.
- SR-ARQ, S AW-ARQ, or Nch-SAW-ARQ are the same as SR-ARQ, and therefore description thereof is omitted.
- the transmitting station is transmitting data to receiving station A.
- the receiving station A measures the line quality several times and repeatedly reports the average value at a predetermined timing.
- the dashed line arrow indicates the line quality from the receiving station A.
- the line quality deteriorates after receiving frame "A6”, and a "bad quality” notification is given in the second notification in the figure.
- the transmitting station receives the NAK for the frame "A6". After that, the channel is allocated to the receiving station A, and then "A 6", "A7", Retransmit "A8" to receiving station A. And from receiving station A At the stage of receiving the notification of “bad quality”, the channel assignment to the receiving station A is stopped, the channel is assigned to the receiving station B, and then the frames “BO” and “B 1” are transmitted.
- the receiving station A notifies the transmitting station of the averaging result of the channel quality measurement value, so a time difference occurs until the transmitting station receives the averaging result. I do. In other words, there is a difference in the line quality between the time when the receiving station A performs the measurement and the time when the transmitting station receives the notification. Regardless, there was a problem that channel assignment to receiving station A was continued.
- the present invention has been made in view of the above, and it is an object of the present invention to reduce the useless communication channel allocation due to the time difference of the line quality notification, and to assign a channel to a receiving station having a good line quality. It is an object of the present invention to provide a communication method, a communication system, and a communication device that improve the overall throughput. Disclosure of the invention
- 1 (transmitting station) to n (receiving station) communication employing ARQ (Automatic Repeat request) technology is performed, and at least one of the transmitting stations is connected to the transmitting station.
- ARQ Automatic Repeat request
- S AW Start and Wait
- a communication channel is allocated to another receiving station by utilizing the fact that the transmission frame is reduced by the SAW, and a channel assignment step of giving priority to communication with the other receiving station; and Special
- the communication with the receiving station of the retransmission request source is returned to the continuous transmission, and the second switching is performed again to give priority to the communication with the receiving station.
- the transmitting station when the transmitting station receives a retransmission request due to line quality deterioration from the receiving station, it changes the operation mode to the SAW mode and retransmits one frame with poor line quality. It was decided to. As a result, the transmitting station preferentially allocates channels to receiving stations with good channel quality without monitoring the channel quality data from the receiving station. Also, upon receiving the retransmission request, the channel assignment to the communication is immediately stopped. This avoids the "state in which channels are unnecessarily allocated despite poor line quality" that occurred in the prior art.
- the transmitting station when the reception of a retransmission frame fails and there is no error in the frame after packet combining, the transmitting station receives the ACK for notifying the reception success even if the ACK is received. If the S AW mode is continued and the reception of a single retransmission frame succeeds, the mode is switched from the S AW mode to the continuous transmission mode when an ACK is received. As a result, many channels are allocated to communication with a truly good line condition.
- the first switching step includes: The communication established with the receiving station is switched to GBN (Go Back N) which is one of the ARQ techniques.
- the transmitting station decides to continue the continuous transmission of frames. This avoids the situation where no receiving station is using the channel and makes the best use of the channel.
- the first switching step includes: The communication established with the receiving station is switched to GBN (Go Back N), which is one of the ARQ techniques.
- GBN Go Back N
- the transmitting station continues continuous transmission of frames even when a retransmission request is received. .
- the frame is immediately transmitted continuously to maintain the transmission delay.
- 1 (transmitting station) to ⁇ (receiving station) communication is performed, and the transmitting station allocates a communication channel to at least one of the receiving stations, and transmits a frame ( Stopping a communication established with the receiving station of the retransmission request source when a retransmission request is received from one of the communicating receiving stations in a state where continuous transmission (data unit) is performed.
- the transmitting station when a retransmission request is received, the transmitting station completely stops the transmission request to the receiving station in which the receiving error has occurred, and uses the channel for transmission to another receiving station. did. In addition, the transmitting station checks the notification of the line quality transmitted using the control channel, and decides whether to resume the continuous transmission of frames. This prevents useless channel allocation when the line quality deteriorates to the point where a reception error occurs even if packet combining is used.
- the communication system adopts the ARQ technology.
- Station and n (receiver) communication can be established.
- the transmitter assigns a communication channel to at least one of the receivers, and performs continuous transmission of frames (data units).
- frames data units.
- the communication with the other receiving station is prioritized, and when the first response signal indicating the normal reception of the specific frame after retransmission can be confirmed, the communication with the receiving station of the retransmission request source is returned to the continuous transmission. Again with the receiving station Is given priority.
- the transmitting station when the transmitting station receives a retransmission request due to line quality deterioration from the receiving station, it changes the operation mode to the SAW mode, and retransmits one frame with poor line quality. Configuration.
- the transmitting station preferentially allocates channels to receiving stations with good channel quality without monitoring the channel quality data from the receiving station. Also, the channel assignment to the communication is immediately stopped upon receiving the retransmission request. This avoids the "state in which channels are unnecessarily allocated despite poor line quality" that occurred in the prior art.
- ⁇ information indicating normal reception of the retransmission frame '' is added.
- the first response signal is transmitted, and the specific frame after the retransmission again becomes a reception error and there is no error in the frame after the bucket combination, ⁇ information indicating a reception error of the retransmission frame '' is transmitted.
- the second response signal added is transmitted, and when the transmitting station receives the second response signal as a response to the retransmission, the communication by the SAW is continued.
- the configuration is such that the mode is changed from the Saw mode to the continuous transmission mode when the ACK is received. As a result, many channels are allocated to communication with a truly good line condition.
- the transmitting station receives the retransmission request, and if the number of receiving stations requesting channel use is smaller than a specific reference value, the transmitting station includes:
- the communication established between the ARQ technology is switched to GBN (Go Back N), which is one of the ARQ techniques.
- the transmitting station when the number of receiving stations requesting the use of the line is smaller than the reference value, and the receiving station receives the retransmission request, the transmitting station continues to continuously transmit frames. This avoids the situation where no receiving station is using the channel and makes the best use of the channel.
- the transmitting station in the case where the transmitting station receives the retransmission request, and there is a request for maintaining a transmission delay as a service quality from an upper layer, the transmitting station communicates with the receiving station of the retransmission request source.
- the communication established between the ARQ technology is switched to GBN (Go Back N), which is one of the ARQ techniques.
- the transmitting station continues to continuously transmit frames even when a retransmission request is received.
- the frame is immediately transmitted continuously to maintain the transmission delay.
- the communication system can establish 1 (transmitting station) to n (receiving station) communication, and the transmitting station establishes a communication channel with at least one of the receiving stations. If a retransmission request is received from one of the communicating receiving stations while allocation and continuous transmission of frames (data units) are being performed, the communication established with the receiving station from which the retransmission request originated is sent. On the other hand, a communication channel is allocated to another receiving station, communication with the other receiving station is prioritized, and ⁇ ⁇ information on line quality notified from the receiving station is checked. Upon recovery, communication with the receiving station that requested retransmission is resumed, and communication with the receiving station is prioritized again. I do.
- a transmitting station when a retransmission request is received, a transmitting station completely stops a transmission request to a receiving station in which a reception error has occurred, and uses the channel for transmission to another receiving station. did. In addition, the transmitting station checks the notification of the line quality transmitted using the control channel, and determines whether to resume the continuous transmission of frames. This prevents useless channel allocation when the line quality deteriorates to the point where a reception error occurs even if packet combining is used.
- the transmitting communication device it is possible to establish communication employing a ARQ technique with a plurality of receiving communication devices, assign a communication channel to at least one of the receiving communication devices, If a request for retransmission of a specific frame is received from one of the communicating communication devices in the state of continuous transmission of frames (data units), it is established with the receiving communication device of the retransmission request source. Is switched from the continuous transmission to S AW, which is one of the ARQ techniques, and then the specific frame is retransmitted by the SAW, while utilizing the fact that the number of transmission frames is reduced by the S AW.
- S AW which is one of the ARQ techniques
- the operation mode is shifted to the SAW mode, and one frame whose line quality is degraded is retransmitted.
- a channel is preferentially allocated to a receiving station having good channel quality without monitoring the channel quality data from the receiving station.
- the channel assignment to the communication is immediately stopped upon receiving the retransmission request. This avoids the "state in which channels are wasted unnecessarily despite the poor line quality" that occurred in the prior art.
- the communication device on the transmitting side As a response to the retransmission, when the first response signal added with "information indicating normal reception of the retransmission frame" is received, the communication with the receiving side communication device of the retransmission request source is returned to the continuous transmission, and the response to the retransmission is returned.
- the communication by the SAW when receiving a second response signal to which “information indicating a reception error of a retransmission frame” is added, the communication by the SAW is continued. If it failed and there was no error in the frame after packet combining, even if it received an ACK to notify the success of reception, it continued in S AW mode and succeeded in receiving the retransmitted frame alone.
- the configuration is such that the mode is changed from the SAW mode to the continuous transmission mode when the ACK is received.
- many channels are allocated for communication with a truly good line condition.
- the receiving side of the retransmission request source receives the retransmission request and the number of receiving communication apparatuses requesting the use of the line is smaller than a specific reference value.
- the communication established with the communication device is switched to GBN (Go Back N) which is one of the ARQ technologies.
- the present invention when the number of receiving stations requesting the use of the line is smaller than the reference value, and a retransmission request is received, continuous transmission of frames is continued. This avoids the situation where no receiving station is using the channel and maximizes the use of the channel.
- the transmission-side communication device when the retransmission request is received, and when there is a request for maintaining transmission delay as a service quality from an upper layer, the transmission-reception request communication device and the reception-side communication device of the retransmission request source The communication established between them is switched to GBN (Go Back N) which is one of the ARQ technologies.
- GBN Go Back N
- a plurality of receiving communication devices and A Establishes communication using RQ technology, allocates communication channels to at least one of the receiving communication devices, and performs continuous transmission of frames (data units). If a retransmission request is received from one of the above, the communication established with the receiving communication device of the retransmission request source is stopped, while a communication channel is allocated to another receiving communication device, and the other Priority is given to communication with the receiving communication device, and the "line quality information" notified from the receiving communication device is checked. The communication is restarted, and the communication with the receiving communication device is prioritized again.
- a transmission request to a receiving station in which a reception error has occurred is completely stopped, and the channel is used for transmission to another receiving station.
- it is configured to check the notification of the line quality transmitted using the control channel and determine whether to resume the continuous transmission of frames. This prevents useless channel assignment when the line quality is poor enough to cause a reception error even when using bucket combining.
- the communication using the ARQ technology is performed with the transmitting communication device, and the retransmission frame sent from the transmitting communication device can be normally received.
- the reception error occurs again in the retransmission frame, and there is no error in the frame after the bucket combining.
- transmitting a second response signal to which "information indicating a retransmission frame reception error" has been added.
- the transmitting station determines whether to continue the S AW mode or shift from the S AW mode to the continuous transmission mode based on the ACK for notifying the reception success.
- FIG. 1 is a diagram showing a configuration of a communication device (transmitting station) according to a first embodiment of the present invention
- FIG. 2 is a diagram showing a communication method of the first embodiment
- FIG. 4 is a diagram illustrating a configuration of a communication device (receiving station) according to a second embodiment of the present invention.
- FIG. 4 is a diagram illustrating a configuration of the communication device (receiving station) according to the second embodiment of the present invention.
- FIG. 5 is a diagram illustrating a communication method according to the second embodiment.
- FIG. 6 is a diagram illustrating a configuration of a communication device (transmitting station) according to the third embodiment of the present invention.
- FIG. 1 is a diagram showing a configuration of a communication device (transmitting station) according to a first embodiment of the present invention
- FIG. 2 is a diagram showing a communication method of the first embodiment
- FIG. 4 is a diagram illustrating
- FIG. 8 is a diagram illustrating a communication method according to a third embodiment
- FIG. 8 is a diagram illustrating a configuration of a communication device (transmitting station) according to a fourth embodiment of the present invention
- FIG. FIG. 10 is a diagram illustrating a configuration of a fifth embodiment of such a communication device (transmitting station).
- FIG. 10 is a diagram illustrating a communication method of the fifth embodiment.
- FIG. 11 is a diagram illustrating a conventional communication method.
- Fig. 12 shows an example of a scheduling method when data is sent from the base station to each mobile station.
- FIG. 13 is a diagram for explaining SR-ARQ of one-to-one communication
- FIG. 14 is a diagram for explaining BGN-ARQ of one-to-one communication.
- FIG. 15 is a diagram for explaining SAW-ARQ of one-to-one communication
- FIG. 16 is a diagram showing a configuration of the base station of FIG. 11, and
- FIG. 18 is a diagram showing NchS AW in the case of FIG. 18; BEST MODE FOR CARRYING OUT THE INVENTION
- the transmitting communication apparatus normally operates in the continuous transmission mode, shifts the operation mode to the SAW mode when a retransmission request or NAK is received, and receives a retransmission frame by a reception notification or ACK. At the stage of receiving the notification, the mode shifts to continuous transmission mode again.
- FIG. 1 is a diagram showing a configuration of a communication apparatus according to a first embodiment of the present invention.
- 1, 1, 1 2,..., 1—n are transmission control units
- 2—1, 2—2,. 1, 3-2,..., 3—n are mode switching units provided in each transmission control unit
- 4 is a scheduler.
- the mode switcher is added to the configuration shown in Fig. 16.
- the scheduler 4 does not need the line quality from the receiving station.
- one base station performs independent wireless communication with n mobile stations, and a limited number of m communication channels To establish n pairs of communications.
- Each transmission control unit and the corresponding transmission buffer exist independently for each mobile station (102-1 to 102-n) that performs communication.
- the transmission buffer is sent from the upper layer.
- the incoming data is stored in the transmission buffer.
- Each transmission control unit notifies the scheduler of a transmission request when receiving data from an upper layer or when receiving a retransmission request or NAK from a mobile station.
- the scheduler 4 allocates a channel to the mobile station based on the transmission request notified from each transmission control unit.
- each transmission control unit upon receiving a reception notification or an ACK notification from the mobile station, deletes the data corresponding to the frame number described therefrom and the data before that frame number from the transmission buffer.
- each mode switching unit shifts the operation mode from continuous transmission mode (normal operation mode) to SAW mode when a retransmission request or NAK is received from the mobile station. If a reception notification or ACK is received during operation in the SAW mode, the operation mode is shifted to the continuous transmission mode. That is, if a reception error occurs on the mobile station side due to the deterioration of the line quality and the retransmission request is recognized by the transmitting station, the transmission control unit that receives the retransmission request changes the operation mode to the SAW mode, , Only the transmission request corresponding to the retransmission frame is transmitted.
- FIG. 2 is a diagram illustrating a communication method according to the first embodiment.
- a base station is a transmitting station and a mobile station is a receiving station.
- the transmitting station allocates a channel to the receiving station A (one of the mobile stations 102-1-1 to 102-n) as in Fig. 18 described above, and switches to the continuous transmission mode. Send the frame. Then, when a reception error of the frame “A 6” occurs, the receiving station A requests retransmission of the frame “A 6” (NAK transmission).
- the transmitting station that has received the retransmission request for frame "A 6" retransmits frame "A 6". And switches the operation mode of the communication established with the receiving station A to the SAW mode.
- the scheduler 4 allocates a channel to the receiving station B by utilizing the reduction in transmission requests to the receiving station A, and then gives priority to communication with the receiving station B.
- the transmitting station retransmits frame "A6”
- it transmits frames "BO", "B1",..., “B4" to receiving station B.
- the NAK of the frame “A6” is received again, the frame “A6” is retransmitted, and then the frames “B5”, “B6”... To the receiving station B are transmitted.
- the transmission control unit that has received the ACK switches the operation mode to the continuous transmission mode, and transmits the continuous transmission to the scheduler 4. Submit the request.
- the scheduler 4 receives the continuous transmission request to the receiving station A, and allocates a channel for communication with the receiving station A again.
- the priority is given to the continuous transmission to the receiving station A in the initial state.
- the scheduler 4 allocates the channels equally to the receiving stations A and B.
- each transmission control unit when each transmission control unit receives a retransmission request or NAK due to poor line quality from the receiving station, it shifts the operation mode to SAW mode, and the line quality deteriorates.
- the retransmission of one frame is requested to the scheduler.
- the scheduler can preferentially allocate more channels to receiving stations with good line quality without monitoring the line quality data from the receiving station.
- channel assignment to the communication is immediately stopped upon a retransmission request or NAK reception.
- the receiving station performs packet synthesis.
- the packet combining process the frame data that failed in the first reception and the frame data that failed in the retransmission are combined, and error correction and error detection are performed after the combining. If there is no error, the frame data can be received correctly. And sends an ACK to the transmitting station.
- Embodiment 2 if unreceivable frame data cannot be correctly received by the retransmission frame alone and uncomplicated frame data can be synthesized by packet synthesis, information of “failure in single reception” is added to the ACK and transmitted.
- the transmitting station receives the ACK, it checks the added information. If “single reception failed”, the transmitting station continues the SAW mode, and if “single reception successful”, returns to the continuous transmission mode.
- FIG. 3 is a diagram showing a configuration of a communication apparatus (transmitting station) according to a second embodiment of the present invention.
- la-l, la-2, ..., la-n are transmission control units
- 3a-1, 3, 3a-2, ..., 3a-n are transmission control units.
- This is a mode switching unit provided in the unit.
- the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. Hereinafter, only the operation different from the first embodiment will be described.
- FIG. 4 is a diagram showing a configuration of a communication apparatus (receiving station) according to a second embodiment of the present invention.
- 11 is a receiving unit
- 12 is an error correcting unit
- 13 is an error detecting unit
- 14 is a receiving buffer
- 15 is a packet combining unit
- 16 is a NAKZACK type determining unit.
- 17 is a transmission unit.
- the receiving station of the present embodiment demodulates the signal from the transmitting unit 11 and the transmitting station, and the error correcting unit 12 performs error correction on the demodulated data. Then, error detection The unit 13 determines the presence or absence of an error, and if there is an error in the new frame, stores the data in the reception buffer 14. On the other hand, if there is an error in the retransmitted frame, the retransmitted frame data and the frame data stored in the reception buffer 14 are combined by the packet combining unit 15. The combined frame data is again subjected to error correction processing and error detection processing.
- the NAKZACK type determination unit 16 Upon receiving the error detection result, the NAKZACK type determination unit 16 provides an error in the NAK when there is an error in the new frame, an error in the AC and ⁇ Single reception failure '' when there is no error in the combined frame data, and an error in the retransmission frame alone. If there is no, ACK and “Single reception successful” are transmitted respectively.
- the transmitting unit 17 modulates the information received from the NAKZACK type determining unit 16 with a predetermined modulation method and transmits the modulated information.
- FIG. 5 is a diagram illustrating a communication method according to the second embodiment. Here, only operations different from those of the first embodiment will be described.
- receiving station A transmits a NAK in response to a reception error of frame “A2”. Then, the transmitting station that has received the NAK also retransmits the frame “A2” and sets the operation mode to the SAW mode, as in the first embodiment.
- the receiving station A transmits “ACK” with “Single reception failure” added to the ACK.
- the transmitting station that has received “Single reception failure” continues the SAW mode according to this ACK and transmits the next frame, frame “A3”. Then, in the receiving station A, for example, when the frame “A3” has been successfully received by itself, the ACK is appended with “Single reception successful” and transmitted.
- the base station that has received “Single reception success” switches the operation mode to the continuous transmission mode according to this ACK, and then transmits frames “A4”, “A5”, “A6”... in continuous transmission.
- the transmitting station if reception of a retransmission frame fails and there is no error in the frame after packet combining, the transmitting station notifies the reception success.
- the S AW mode is continued even if an ACK is received, and if the retransmission frame alone is successfully received, the system switches from the S AW mode to the continuous transmission mode when AC # is received. As a result, a large number of channels can be allocated only to communications with a truly good line condition.
- FIG. 6 is a diagram showing a configuration of a communication apparatus (transmitting station) according to a third embodiment of the present invention. Here, it corresponds to the case where the number of receiving stations requesting channel use is small.
- lb-1, lb-2, ..., 1b-n are transmission control units
- 3b-1, 3, bb-2, ..., 3b-1n are included in each transmission control unit.
- the provided mode switching unit, and 4b is a scheduler.
- the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
- only operations different from the first embodiment will be described.
- the scheduler 4b notifies each mode switching unit of the line use status.
- Each mode switching unit refers to this line usage status, and even if a retransmission request or NAK is received from the receiving station, the number of other receiving stations using the line is less than the predetermined reference value. In this case, retransmission and continuous transmission requests are continued in GBN mode without transition to SAW mode.
- FIG. 7 is a diagram illustrating a communication method according to the third embodiment.
- receiving station A transmits a NAK when a receiving error of frame "A6" occurs.
- the transmitting station that receives the NAK corresponding to frame "A6" determines whether to switch to the SAW mode and retransmit, or to switch to the GBN mode and retransmit, by referring to the above line usage status. .
- the mode switching unit shifts to the GBN mode and continues the request for continuous transmission.
- the mode switching unit in the transmitting station when the number of receiving stations requesting the use of the line is smaller than the reference value and a retransmission request or NAK is received, the mode switching unit in the transmitting station performs continuous frame transmission. Was continued. This allows any receiving Since the station can avoid situations where the channel is not used, the channel can be used to the maximum extent.
- FIG. 8 is a diagram showing a configuration of a communication apparatus (transmitting station) according to a fourth embodiment of the present invention.
- “quality of service” includes “communication requiring maintenance of transmission delay”.
- lc-l, 1c-2,..., 1c-n are transmission control units, and 3c-l, 3c-2,.
- This is a mode switching unit provided in the control unit.
- the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
- Each transmission control unit is notified of information on required service quality from the upper layer.
- Each mode switching unit refers to the required quality of service information, and even if a retransmission request or NAC is received from the receiving station, if this communication requires a transmission delay to be maintained, the S AW Continue retransmission and continuous transmission in GBN mode without switching to mode.
- the procedure of the communication method is the same as in FIG. 7 described above.
- the mode switching unit continues the continuous transmission of frames. Configuration. As a result, when the communication line in which the receiving error has occurred is recovered, the frame can be received correctly immediately, so that the transmission delay can be maintained.
- Embodiments 1 to 4 described above even when the transmitting station receives ⁇ , the transmission of frames is continued at a low transmission rate. As a result, even if the communication quality deteriorates, a small number of communication lines are provided, so that the state of recovery of the communication quality can always be checked, and the situation can be promptly dealt with when the communication quality recovers. In particular, when packet combining is employed as in Embodiment 2, communication can be continued even at a low transmission speed, and thus a minimum service can be provided.
- FIG. 9 is a diagram showing a configuration of a communication apparatus (transmitting station) according to a fifth embodiment of the present invention.
- Id-1, Id-2, ..., Id-n are transmission control units
- 3d-1, 3d-2, ..., 3d-n are transmission units.
- This is a mode switching unit provided in the control unit.
- the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
- the operation different from the first embodiment will be described.
- the corresponding transmission control unit upon receiving a retransmission request or NAK, the corresponding transmission control unit stops the transmission request and checks the recovery status based on the line quality information received from the receiving station. If it is determined that the line quality has been recovered, the corresponding transmission control unit sends a transmission request to the scheduler 4 with the data to be retransmitted at the top.
- FIG. 10 is a diagram showing a communication method according to the fifth embodiment.
- the transmitting station allocates a channel for communication with the receiving station A, and transmits a frame in the continuous transmission mode. For example, if a reception error of frame “A 6” occurs at receiving station A, receiving station A issues a retransmission request (NAK) for frame “A 6”.
- NAK retransmission request
- the transmitting station does not transmit the frame to the receiving station A, but checks the “information about the channel quality” notified from the receiving station A using the control channel. For example, if the line quality remains poor, transmission suspension is continued, and if the line quality recovers, the continuous transmission of frames to receiving station A is immediately resumed.
- the receiving station measures the communication quality of the signal on the channel that the transmitting station transmits periodically and that can be received by all the receiving stations within the area.
- the transmission control unit when a NAK is received, the transmission control unit Has completely stopped the transmission request to the receiving station where the receiving error occurred, and used the channel for transmission to other receiving stations. In addition, the transmission control unit checks whether the receiving station that has received the reception error reports the line quality to be transmitted using the control channel, and determines whether to resume the request for continuous transmission. . As a result, useless channel assignment can be prevented when the line quality is degraded to the point where a reception error occurs even if bucket combining is used. Industrial applicability
- the communication method according to the present invention is useful for a communication system employing an ARQ (Automatic Repeat at request) technique, and in particular, the quality is degraded due to noise or interference from communication with other stations. Suitable for communication systems that communicate in a possible environment.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Communication Control (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/486,785 US7096027B2 (en) | 2001-10-04 | 2001-10-04 | Communication method, communication system and communication apparatus |
EP01974678A EP1434379A1 (en) | 2001-10-04 | 2001-10-04 | COMMUNICATION METHOD, COMMUNICATION SYSTEM AND COMMUNICATION APPARATUS |
JP2003535404A JPWO2003032566A1 (ja) | 2001-10-04 | 2001-10-04 | 通信方法、通信システムおよび通信装置 |
PCT/JP2001/008741 WO2003032566A1 (fr) | 2001-10-04 | 2001-10-04 | Procede de communication, systeme de communication et appareil de communication |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2001/008741 WO2003032566A1 (fr) | 2001-10-04 | 2001-10-04 | Procede de communication, systeme de communication et appareil de communication |
Publications (1)
Publication Number | Publication Date |
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WO2003032566A1 true WO2003032566A1 (fr) | 2003-04-17 |
Family
ID=11737805
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/008741 WO2003032566A1 (fr) | 2001-10-04 | 2001-10-04 | Procede de communication, systeme de communication et appareil de communication |
Country Status (4)
Country | Link |
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US (1) | US7096027B2 (ja) |
EP (1) | EP1434379A1 (ja) |
JP (1) | JPWO2003032566A1 (ja) |
WO (1) | WO2003032566A1 (ja) |
Cited By (6)
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JP2006014286A (ja) * | 2004-05-19 | 2006-01-12 | Mitsubishi Electric Information Technology Centre Europa Bv | ネットワークにおいて資源を割り当てるための方法および装置 |
JP2007036759A (ja) * | 2005-07-27 | 2007-02-08 | Yamaha Corp | ワイヤレスオーディオ伝送システム、ワイヤレスオーディオ受信装置およびワイヤレスオーディオ送信装置 |
JP2008543167A (ja) * | 2005-05-23 | 2008-11-27 | テレフオンアクチーボラゲット エル エム エリクソン(パブル) | 複数の補完的なフィードバックメカニズムを有する自動再送要求(arq)プロトコル |
JP2010516188A (ja) * | 2007-01-08 | 2010-05-13 | インターデイジタル テクノロジー コーポレーション | フィードバック情報をマルチキャストする方法および機器 |
US8032144B2 (en) | 2003-07-03 | 2011-10-04 | Panasonic Corporation | Multi-carrier communication device and feedback information communication method |
JPWO2011096009A1 (ja) * | 2010-02-02 | 2013-06-06 | 株式会社東芝 | 無線機器及び無線システム |
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US7013157B1 (en) * | 2002-06-03 | 2006-03-14 | Cisco Technology, Inc. | Method for multicast delivery with designated acknowledgment |
JP4048094B2 (ja) * | 2002-10-04 | 2008-02-13 | 株式会社エヌ・ティ・ティ・ドコモ | 移動通信システム、移動通信方法、及びこれらに用いて好適な移動局 |
CN1843002B (zh) * | 2003-08-26 | 2016-05-11 | 皇家飞利浦电子股份有限公司 | 点到多点传输 |
US20080081651A1 (en) * | 2004-08-10 | 2008-04-03 | Nahoko Kuroda | Communication Control Method, Radio Communication System, Base Station, and Mobile Station |
DE602005022502D1 (de) * | 2005-08-22 | 2010-09-02 | Ericsson Telefon Ab L M | Kommunikationssystem und verfahren zum übertragen von daten zwischen einem endgerät und netzbetriebsmitteln |
JP4419023B2 (ja) * | 2006-03-23 | 2010-02-24 | 株式会社カシオ日立モバイルコミュニケーションズ | 移動体通信端末、および、プログラム |
JP2008136075A (ja) * | 2006-11-29 | 2008-06-12 | Nec Electronics Corp | スケジューリング装置およびスケジューリング方法ならびにホスト装置 |
US8559323B2 (en) | 2010-03-10 | 2013-10-15 | Cisco Technology, Inc. | Downlink OFDMA for service sets with mixed client types |
US9154264B2 (en) * | 2011-03-30 | 2015-10-06 | Intel Corporation | Device, system and method of wireless communication between circuits |
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- 2001-10-04 EP EP01974678A patent/EP1434379A1/en not_active Withdrawn
- 2001-10-04 JP JP2003535404A patent/JPWO2003032566A1/ja active Pending
- 2001-10-04 WO PCT/JP2001/008741 patent/WO2003032566A1/ja not_active Application Discontinuation
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US8032144B2 (en) | 2003-07-03 | 2011-10-04 | Panasonic Corporation | Multi-carrier communication device and feedback information communication method |
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JP2010516188A (ja) * | 2007-01-08 | 2010-05-13 | インターデイジタル テクノロジー コーポレーション | フィードバック情報をマルチキャストする方法および機器 |
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Also Published As
Publication number | Publication date |
---|---|
US20040248579A1 (en) | 2004-12-09 |
JPWO2003032566A1 (ja) | 2005-01-27 |
EP1434379A1 (en) | 2004-06-30 |
US7096027B2 (en) | 2006-08-22 |
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