WO2008141484A1

WO2008141484A1 - A method and retransfer controlling system for a single data packet or the last data packet

Info

Publication number: WO2008141484A1
Application number: PCT/CN2007/001962
Authority: WO
Inventors: Tao Yang; Mingli You
Original assignee: Alcatel Shanghai Bell Co., Ltd.
Priority date: 2007-05-18
Filing date: 2007-06-22
Publication date: 2008-11-27
Also published as: CN101309129A; CN101309129B

Abstract

A method for retransfer controlling a single data packet or the last data packet in the sequential data flow includes: when a HARQ transmitter has detected a positive acknowledgement ACK which is fed back from a HARQ receiver for the single data packet or the last data packet in the sequential data flow, the HARQ transmitter only transmits a control signal to the HARQ receiver and starts a timer, in order to wait for that the HARQ receiver re-feeds back a positive acknowledgement ACK or a negative acknowledgement NACK for the control signal; when the HARQ transmitter has detected the ACK which is fed back from the HARQ receiver for the control signal in the range of the timer, the HARQ transmitter generates a local ACK and sends it to a ARQ transmitter ; and when the HARQ transmitter has detected the NACK which is fed back from the HARQ receiver for the control signal in the range of the timer, the HARQ transmitter starts the HARQ-level retransfer.

Description

Retransmission control method and system for individual data packets or last data packet

Technical field

The present invention relates to the field of mobile communications. Specifically, the present invention relates to a retransmission control method for a single data packet or a last data packet of a continuous data stream, a HARQ transmitter, a transmitting end device, and a retransmission control system implementing the method, which can provide a HARQ-level retransmission The robust and practical ARQ/HARQ cross-layer operation solution achieves very small latency, ensures reliable data transmission, and saves wireless resources. Background technique

The 3GPP (3rd Generation Partnership Project) launched the Long Term Evolution Research Project (LTE) in 2005, hoping to support the growing needs of operators and users with higher data throughput and better network performance.

In the study of LTE, a major decision was to use ARQ (Automatic Repeat Request) and HARQ (Hybrid Automatic Repeat Request) cross-layer operation between RLC (Radio Link Layer) and MAC (Media Access Layer). To solve the problem of waiting time. The ARQ and HARQ operation processes for continuous data streams have been widely discussed and implemented in the 3GPP protocol. However, there is still a problem worth studying for ARQ/HARQ cross-layer operations, namely how to process individual packets or the last packet of a continuous data stream.

Ericsson and NTT DoComo have raised their solutions to this problem at the recent RAN2 meeting (see R2-061861 HARQ-ARQ Interactions. Ericsson and R2-061923. ARQ protocol With assist of HARQ. NTT DoCoMo, Inc ) ₀

Ericsson proposes different schemes for NACK (negative acknowledgement) -> ACK (positive acknowledgement) and DTX (discontinuous transmission) -> ACK signaling errors, respectively. In the case of NACK -> ACK signaling error, if a NACK is generated, a timer is used in the ARQ receiver. If the retransmission data is not received until the timer expires, the ARQ receiver requires retransmission. For the DTX->ACK signaling error scenario, another timer is started in the ARQ transmitter after transmitting the individual data packet or the last data packet of the continuous data stream to the L1 layer. Also, a poll bit is set in the PDU (Protocol Data Unit) header. If it is until the timer After the expiration has not received a report from the ARQ receiver, the ARQ transmitter performs a retransmission.

NTT DoComo Corporation proposes to send a pseudo PDU for detecting ACK in the transmitter. The receiver will then feed back whether the previously generated ACK/NACK was received correctly.

In general, Ericsson's solution is not practical. The reason is that it uses different solutions for different scenarios, but it is very difficult to distinguish between the two scenarios in the transmitter and receiver. In particular, for a receiver, the receiver does not know whether the transmitted data is a single data packet or the last data packet of a continuous data stream before it successfully decodes the data. That is, the receiver does not know when to start the associated timer. Moreover, these two schemes for different scenarios are practically inoperable and conflict with the already agreed solutions for continuous stream processing.

In the NTT DoComo solution, the following defects can be foreseen:

- This pseudo PDU is useless and only wastes valuable radio resources;

- A specific transport format should be defined for this pseudo PDU transmission, which increases system complexity;

- This scheme reduces the HARQ gain because the pseudo PDU is useless for HARQ combining in the receiver;

- This retransmission occurred at the ARQ level, resulting in a longer delay. Summary of the invention

The present invention has been made in order to overcome the above-mentioned drawbacks in the prior art. The object of the present invention is to provide a retransmission control method for a single data packet or a last data packet of a continuous data stream, a HARQ transmitter, a transmitting end device and a retransmission control system implementing the method, which can provide a HARQ-based The robust and practical ARQ/HARQ cross-layer operation scheme of retransmission achieves very small waiting time, ensures the reliability of data transmission, and saves radio resources.

In order to achieve the above object, according to the present invention, a retransmission control method for a single data packet or a last data packet of a continuous data stream is proposed, including: when a HARQ transmitter detects a separate data packet or is fed back from a HARQ receiver or When the acknowledgment ACK of the last packet of the continuous data stream, the HARQ transmitter transmits only control signaling to the HARQ receiver and starts a timer to wait for the HARQ receiver to re-feed back the acknowledge ACK or the control signaling Negative acknowledgement NACK; when the HARQ transmitter detects an ACK fed back from the HARQ receiver for the control signaling within the timing of the timer, the HARQ transmitter generates a local ACK and transmits to the ARQ transmitter; and when the HARQ transmits When the machine detects a NACK fed back from the HARQ receiver for the control signaling within the timing of the timer, the HARQ transmitter initiates a HARQ level retransmission. Preferably, the method further comprises: when the HARQ transmitter does not detect an ACK or NACK fed back from the HARQ receiver for the control signaling until the timer expires, if the maximum number of retransmissions has arrived, the HARQ The transmitter generates a local NACK and transmits it to the ARQ transmitter; conversely, if the maximum number of retransmissions has not arrived, the HARQ transmitter initiates a HARQ level retransmission.

Advantageously, the method further comprises: when the HARQ transmitter performs a HARQ level retransmission until a retransmission limit detects a NACK fed back from the HARQ receiver, the HARQ transmitter generates a local NACK and transmits to the ARQ transmission machine.

Preferably, the method further comprises: when receiving a local NACK from the HARQ transmitter, the ARQ transmitter initiates an ARQ level retransmission.

Preferably, the method further comprises: when receiving a local ACK from the HARQ transmitter, the ARQ transmitter determines that the last data packet or the last data packet of the continuous data stream has been correctly transmitted to the receiving end, and discards the data. package.

Preferably, the HARQ transmitter transmits only control signaling to the HARQ receiver indicating that the HARQ transmitter does not transmit data on the data channel and transmits the control signaling only on the control signaling channel.

Preferably, the HARQ transmitter and the HARQ receiver are located at the medium access layer, and the ARQ transmitter and the ARQ receiver are located at the radio link layer.

In addition, according to the present invention, there is also proposed a HARQ transmitter for realizing retransmission control of a last data packet or a last data packet of a continuous data stream, comprising: first detecting means, detecting for a single data packet or a continuous data stream last a packet of information fed back from the HARQ receiver, the control signaling transmission means, when the first detecting means detects a positive acknowledgement ACK for the individual data packet or the last data packet of the continuous data stream fed back from the HARQ receiver The control signaling transmission device transmits only control signaling to the HARQ receiver and starts a timer to wait for the HARQ receiver to re-feed back a positive acknowledgement ACK or a negative acknowledgement NACK for the control signaling; the second detecting device, at the timer Detecting information fed back from the HARQ receiver for the control signaling in a timing; a local ACK or NACK generating means, when the second detecting means detects an ACK fed back from the HARQ receiver for the control signaling within the timing of the timer The local ACK or NACK generating device generates a local ACK and transmits to the ARQ transmitter; and H An ARQ-level retransmission control apparatus, when the second detecting apparatus detects a NACK fed back from the HARQ receiver for the control signaling within a timing of the timer, the HARQ-level retransmission control apparatus initiates a HARQ-level retransmission; a packet buffer; and the timer.

Preferably, when the second detecting device does not detect the ACK or NACK fed back from the HARQ receiver for the control signaling until the timer expires, if the maximum number of retransmissions has arrived, the local ACK or NACK is generated. The live device generates a local NACK and transmits it to the ARQ transmitter; if the maximum number of retransmissions has not arrived, the HARQ level retransmission control device initiates a HARQ level retransmission.

Preferably, when the HARQ-level retransmission control apparatus performs HARQ-level retransmission until a retransmission limit detects a NACK fed back from the HARQ receiver, the local ACK or NACK generating apparatus generates a local NACK and transmits to the ARQ transmission. machine.

Further, according to the present invention, there is also proposed a transmitting device including the above-described HARQ transmitter and ARQ transmitter.

Preferably, the ARQ transmitter initiates an ARQ level retransmission when a local NACK is received from the HARQ transmitter.

Preferably, when receiving a local ACK from the HARQ transmitter, the ARQ transmitter determines that the last data packet or the last data packet of the continuous data stream has been correctly transmitted to the receiving end, and discards the relevant data packet.

Further, according to the present invention, there is also proposed a retransmission control system comprising the above-mentioned transmitting end device and a receiving end device, the receiving end device comprising a HARQ receiver and an ARQ receiver. DRAWINGS

The above objects, advantages and features of the present invention will become more apparent from

1 is a schematic diagram showing an ARQ/HARQ cross-layer structure for performing retransmission control according to the present invention; FIG. 2 is a timing chart showing retransmission control by ARQ/HARQ cross-layer operation under normal conditions according to the present invention. Figure

3 is a timing diagram showing retransmission control by ARQ/HARQ cross-layer operation in an abnormal situation according to the present invention;

4 is a block diagram showing the structure of a HARQ transmitter implementing retransmission control in accordance with the present invention. detailed description

Preferred embodiments of the present invention will now be described with reference to the accompanying drawings.

1 is a schematic diagram showing an ARQ/HARQ cross-layer structure for performing retransmission control according to the present invention. As shown in FIG. 1, the ARQ/HARQ cross-layer structure includes an ARQ transmitter 101, a HARQ transmitter 103, a HARQ receiver 105, and a HARQ receiver 107. The HARQ transmitter 103 and the HARQ receiver 105 are located at the medium access layer, and the ARQ is transmitted. The machine 101 and the ARQ receiver 107 are located at the radio link layer. The ARQ/HARQ cross-layer structure forms a retransmission control system for implementing retransmission control for a single data packet or a last data packet of a continuous data stream, which implements the ARQ/HARQ cross-layer operation according to the present invention. The retransmission control is as follows.

2 is a timing diagram showing retransmission control by ARQ/HARQ cross-layer operation under normal conditions in accordance with the present invention.

In accordance with the present invention, when the ARQ transmitter 101 transmits a PDU to the lower layer, the ARQ transmitter 101 indicates to the HARQ transmitter 103 the status of the last data packet for the individual data packet or the continuous data stream. Whenever the ARQ transmitter 101 receives a local ACK from the HARQ transmitter 103, the ARQ transmitter 101 discards the associated data packet. Whenever the ARQ transmitter 101 receives a local NACK from the HARQ transmitter 103, the ARQ transmitter 101 performs a retransmission.

Now, the HARQ transmitter 103 knows the status of the last data packet for a separate data packet or a continuous data stream, and the HARQ transmitter 103 will be based on the last data packet from the HARQ receiver 105 for a separate data packet or a continuous data stream. Feedback, perform the following processing:

(Process A: ) Normal: Received a positive acknowledgement ACK (no signaling error)

Upon receiving an ACK for the last packet of the individual data packet or the continuous data stream, the HARQ transmitter 103:

- keep the data packets in the buffer;

- Start timer (1)

- The updated HARQ control information is transmitted to the HARQ receiver 105 only on the control signaling channel, and there is no data transmission on the data channel, which significantly saves radio resources.

At this time, upon receiving the transmitted control signaling, the HARQ receiver 105 will only re-feed back the ACK information to indicate that the last individual packet or the last packet of the continuous stream has been correctly decoded.

Then, upon detecting the ACK, the HARQ transmitter 103:

- stop the timer;

- clear the data in the buffer;

- Generate a local ACK and send it to the ARQ transmitter 101.

After receiving the local ACK, the ARQ transmitter 101 discards the associated data packet. At this point, it indicates that the last data packet or the last data packet of the continuous data stream has been correctly received by the receiving end. Specifically, as shown in Figure 1.

It should be noted that, on the other hand, if the timer (1) expires, the HARQ transmitter 103 The ACK fed back from the receiving end has not been received, and if the maximum number of retransmissions has arrived, the HARQ transmitter 103 generates a local NACK and transmits the local NACK to the ARQ transmitter 101 to trigger an ARQ level retransmission. On the other hand, if the maximum number of retransmissions does not arrive, the HARQ transmitter 103 performs HARQ level retransmission.

The timer (1) can be set to satisfy the second HARQ transmission, thereby achieving a very low probability HARQ NACK/ACK BLER (error rate), BLER with 2 transmissions, and BLER* for the first transmission. BLER for secondary transmission.

(Process B _: ) Normal: Received NACK

Upon receiving a negative acknowledgement NACK for the individual data packet or the last data packet of the continuous data stream, the HARQ transmitter 103 performs HARQ level automatic retransmission until the maximum transmission limit.

If the feedback for the final HARQ level retransmission is still NACK, the HARQ transmitter 103 clears the buffer data and generates a local NACK, and sends the NACK to the ARQ transmitter 101 to trigger an ARQ level retransmission. 3 is a timing diagram showing retransmission control by ARQ/HARQ cross-layer operation in an abnormal situation according to the present invention.

(Process C: ) Abnormal condition: NACK -> ACK signaling error condition

Upon receiving an ACK for the last packet of the individual data packet or the continuous data stream (NACK -> ACK signaling error has occurred), then the HARQ transmitter 103:

- keep the data packets in the buffer;

- Start timer (1)

- The updated HARQ control signaling is transmitted to the HARQ receiver 105 only on the control signaling channel, and there is no data transmission on the associated data channel.

Upon receiving the control signaling, the HARQ receiver 105 will feed back NACK after the regular HARQ operation.

After detecting the NACK from the HARQ receiver 105, the HARQ transmitter 103 stops the timer (1) and performs a retransmission as shown in (Process B:). Specifically as shown in Figure 3.

Otherwise, if an ACK is received again, go to (Process A:). However, as mentioned above, the cumulative signaling error probability is very low.

On the other hand, if the HARQ transmitter 103 has not received an ACK until the expiration of the timer (1), if When the maximum number of retransmissions has arrived, the HARQ transmitter 103 will generate a local NACK and send the local NACK to the ARQ transmitter 101 to trigger an ARQ level retransmission. On the other hand, if the maximum number of retransmissions does not arrive, the HARQ transmitter 103 performs HARQ level retransmission. (Process D: ) Abnormal condition: DTX (discontinuous transmission) -> ACK signaling error condition

Upon receiving an ACK for the last packet of the individual data packet or the continuous data stream (due to the DTX-> ACK signaling error), then the HARQ transmitter 103:

- keep the data packets in the buffer;

- Start timer (1)

Upon receiving the control signaling, the HARQ receiver 105 will feed back NACK since no data is transmitted. After detecting the NACK from the HARQ receiver 105, the HARQ transmitter 103 stops the timer (1) and performs a retransmission as shown in the procedure (Process B: ), which is similar to the procedure shown in FIG.

Otherwise, if an ACK is received due to a DTX->ACK signaling error, go to the process (process

A:).

On the other hand, if the HARQ transmitter 103 has not received an ACK until the expiration of the timer (1), if the maximum number of retransmissions has arrived, the HARQ transmitter 103 will generate a local NACK and send the local NACK to the ARQ. Transmitter 101, to trigger an ARQ level retransmission. On the other hand, if the maximum number of retransmissions does not arrive, the HARQ transmitter 103 performs HARQ level retransmission. 4 is a block diagram showing the structure of a HARQ transmitter implementing retransmission control in accordance with the present invention.

As shown in FIG. 4, the HARQ transmitter 103 implementing retransmission control according to the present invention includes a first detecting device 401, a control signaling transmitting device 403, a second detecting device 405, a local ACK or NACK generating device 407, and a HARQ level. The control device 409, the packet buffer 411, and the timer 413 are transmitted.

The first detecting means 401 detects information fed back from the HARQ receiver 105 for the last data packet or the last data packet of the continuous data stream. When the first detecting means 401 detects a positive acknowledgement ACK for the individual data packet or the last data packet of the continuous data stream fed back from the HARQ receiver 105, the control signaling transmitting means 403 transmits only the control signal to the HARQ receiver 105. And, a timer is started to wait for the HARQ receiver 105 to re-feed back a positive acknowledgement ACK or a negative acknowledgement NACK for the control signaling. Second detecting device 405 detects information fed back from the HARQ receiver 105 for the control signaling within the timing of the timer 413. When the second detecting means 405 detects an ACK fed back from the HARQ receiver 105 for the control signaling within the timing of the timer 413, the local ACK or NACK generating means 407 generates a local ACK and transmits it to the ARQ transmitter 101. . When the second detecting means 405 detects a NACK fed back from the HARQ receiver 105 for the control signaling within the timing of the timer 413, the HARQ level retransmission control means 409 initiates a HARQ level retransmission. The packet buffer 411 buffers the data packet.

In addition, when the second detecting means 405 does not detect the ACK or NACK fed back from the HARQ receiver 105 for the control signaling until the timer 413 expires, if the maximum number of retransmissions has arrived, the local ACK or NACK The generating means 407 generates a local NACK and transmits it to the ARQ transmitter 101. On the other hand, if the maximum number of retransmissions does not arrive, the HARQ level retransmission control device 409 initiates a HARQ level retransmission. When the HARQ-level retransmission control device 409 performs HARQ-level retransmission until the retransmission limit detects a NACK fed back from the HARQ receiver 105, the local ACK or NACK generating device 407 generates a local NACK and transmits it to the ARQ transmission. Machine 101.

At the RLC layer of the transmitting end, when receiving a local NACK from the HARQ transmitter 103, the ARQ transmitter 101 initiates an ARQ level retransmission. When receiving a local ACK from the HARQ transmitter 103, the ARQ transmitter 101 determines that the last data packet or the last data packet of the continuous data stream has been correctly transmitted to the receiving end and discards the relevant data packet.

Compared with the prior art, the present invention has the following advantages:

1. The present invention solves the problem of signaling error for the last packet of a single data packet or a continuous data stream, which is a very important subject in the LTE 3GPP standardization.

2. According to the present invention, retransmission is first performed at the HARQ level to reduce the delay. Due to retransmission, the cumulative transmission error at the HARQ level becomes very low (0.02 or less). Since the normal ARQ mechanism handles very low probability retransmissions at the L2 layer, the reliability of data transmission is further ensured.

3. According to the present invention, since the pseudo PDU is not transmitted, it is not necessary to define a special indication for the pseudo PDU, which helps to avoid waste of resources and reduce system overhead.

4. According to the present invention, upon detecting an ACK, the HARQ transmitter transmits only the control signal to the HARQ receiver without transmitting the data on the data channel. The control signaling is used to trigger the HARQ receiver to re-feed back NACK or ACK, resulting in a HARQ level retransmission or a local ACK at the HARQ transmitter. In this scenario, resource waste is avoided because data is not transmitted on the data channel.

5. The present invention is a robust solution and maintains continuity with existing retransmission strategies. For the last packet of a single packet or a continuous stream, after an ACK is detected within the timing of the timer (1), The HARQ transmitter only generates a local ACK.

6. According to the present invention, the signaling error can be mostly solved in the HARQ level retransmission, which is faster than the ARQ level retransmission scheme proposed by other companies (such as Ericsson and NTT DoComo). .

While the invention has been described in terms of the preferred embodiments of the present invention, it will be understood that various modifications, changes and changes may be made to the inventions without departing from the spirit and scope of the invention. Therefore, the present invention should not be limited by the foregoing embodiments, but by the appended claims and their equivalents.

Claims

Rights request

1. A retransmission control method for a single data packet or a last data packet of a continuous data stream, comprising - when the HARQ transmitter detects a feedback from the HARQ receiver for the last data packet or the last data packet of the continuous data stream When answering the ACK, the HARQ transmitter transmits only control signaling to the HARQ receiver, and starts a timer to wait for the HARQ receiver to re-feed back a positive acknowledgement ACK or a negative acknowledgement NACK for the control signaling;

When the HARQ transmitter detects an ACK that is fed back from the HARQ receiver for the control signaling within the timing of the timer, the HARQ transmitter generates a local ACK and transmits to the ARQ transmitter;

When the HARQ transmitter detects a NACK fed back from the HARQ receiver for the control signaling within the timing of the timer, the HARQ transmitter initiates a HARQ level retransmission.

2. The method according to claim 1, further comprising: when the HARQ transmitter does not detect an ACK or NACK fed back from the HARQ receiver for the control signaling until the timer expires, if the maximum weight The number of transmissions has arrived, the HARQ transmitter generates a local NACK and transmits to the ARQ transmitter; conversely, if the maximum number of retransmissions has not arrived, the HARQ transmitter initiates a HARQ level retransmission.

3. The method according to claim 1, further comprising: said HARQ transmitter when said HARQ transmitter performs HARQ level retransmission until a retransmission limit detects a NACK fed back from the HARQ receiver. A local NACK is generated and sent to the ARQ transmitter.

4. The method of claim 1, further comprising: when receiving a local NACK from the HARQ transmitter, the ARQ transmitter initiates an ARQ level retransmission.

5. The method of claim 1, further comprising: when receiving a local ACK from the HARQ transmitter, the ARQ transmitter determines that the last data packet or the last data packet of the continuous data stream has been correctly Transfer to the receiving end and discard the packet.

6. The method according to claim 1, wherein the HARQ transmitter transmits only control signaling to the HARQ receiver indicating that the HARQ transmitter does not perform data transmission on a data channel but only on a control signaling channel. Transmitting the control signaling.

7. The method according to claim 1, wherein: the HARQ transmitter and the HARQ receiver are located at a medium access layer, and the ARQ transmitter and the ARQ receiver are located at a radio link layer.

8. A HARQ transmitter that implements retransmission control for a single data packet or a last data packet of a continuous data stream, including:

a first detecting means for detecting information fed back from the HARQ receiver for the last data packet or the last data packet of the continuous data stream,

Controlling the signaling transmission means, when the first detecting means detects a positive acknowledgement ACK for the individual data packet or the last data packet of the continuous data stream fed back from the HARQ receiver, the control signaling transmission means transmits only to the HARQ receiver Controlling signaling, and starting a timer to wait for the HARQ receiver to re-feed back a positive acknowledgement ACK or a negative acknowledgement NACK for the control signaling;

a second detecting means, detecting information fed back from the HARQ receiver for the control signaling within a timing of the timer;

a local ACK or NACK generating apparatus, when the second detecting apparatus detects an ACK fed back from the HARQ receiver for the control signaling within a timing of a timer, the local ACK or NACK generating apparatus generates a local ACK and transmits to the ARQ Transmitter;

a HARQ-level retransmission control apparatus, when the second detecting apparatus detects a NACK fed back from the HARQ receiver for the control signaling within a timing of the timer, the HARQ-level retransmission control apparatus initiates a HARQ-level retransmission;

Packet buffer;

The timer.

9. The HARQ transmitter according to claim 8, wherein when the second detecting means does not detect an ACK or NACK fed back from the HARQ receiver for the control signaling until the timer expires, if the maximum weight The number of transmissions has arrived, the local ACK or NACK generating means generates a local NACK and transmits to the ARQ transmitter; if the maximum number of retransmissions has not arrived, the HARQ level retransmission control apparatus initiates a HARQ level retransmission.

10. The HARQ transmitter according to claim 8, wherein when the HARQ-level retransmission control apparatus performs HARQ-level retransmission until a retransmission limit is detected, a NACK fed back from the HARQ receiver is still detected, the local The ACK or NACK generating device generates a local NACK and transmits it to the ARQ transmitter.

11. The HARQ transmitter of claim 8, wherein the HARQ transmitter and the HARQ receiver are located at a medium access layer, and the ARQ transmitter and the ARQ receiver are located at a radio link layer.

12. A transmitting device comprising the HARQ transmitter of claim 8 and an ARQ transmitter.

13. The transmitting device according to claim 12, characterized in that when receiving from a HARQ transmitter When the local NACK is reached, the ARQ transmitter initiates an ARQ level retransmission.

14. The transmitting end device according to claim 12, wherein when receiving a local ACK from the HARQ transmitter, the ARQ transmitter determines that the last data packet or the last data packet of the continuous data stream has been correctly transmitted. Go to the receiving end and discard the relevant packets.

15. The transmitting end device according to claim 12, wherein the HARQ transmitter and the HARQ receiver are located at a medium access layer, and the ARQ transmitter and the ARQ receiver are located at a radio link layer.

A retransmission control system comprising a transmitting end device according to claim 12 and a receiving end device, the receiving end device comprising a HARQ receiver and an ARQ receiver.

17. The retransmission control system according to claim 16, wherein the HARQ transmitter and the HARQ receiver are located at a medium access layer, and the ARQ transmitter and the ARQ receiver are located at a radio link layer.