WO2013107408A1

WO2013107408A1 - Data transmission method and device

Info

Publication number: WO2013107408A1
Application number: PCT/CN2013/070763
Authority: WO
Inventors: 徐宏亮
Original assignee: 华为技术有限公司
Priority date: 2012-01-20
Filing date: 2013-01-21
Publication date: 2013-07-25
Also published as: CN103220091A

Abstract

The present invention relates to the technical field of communications, and disclosed are a data transmission method and device, so as to decrease a delay during data packet transmission. The method comprises: a sender initially transmitting a data packet or a data packet group to a receiver; until receiving acknowledgement (ACK) information, sent by the receiver and corresponding to the data packet or the data packet group, the sender retransmitting the data packet or the data packet group to the receiver at least once, the ACK information indicating that the receiver correctly receives the data packet or the data packet group. The present invention is mainly applied in the field of data packet transmission.

Description

Data transmission method 3⁄4L ^

The present application claims priority to Chinese Patent Application No. 201210019019. filed on Jan. 20, 2012, the entire disclosure of which is incorporated herein by reference. Technical field

The present invention relates to the field of wireless communication technologies, and in particular, to a data transmission method and apparatus.

Background technique

The transmission of the data packet in the channel sometimes fails. In order to ensure that the receiving end can correctly receive the data packet, the transmitting end retransmits the data packet when the transmission fails, until the receiving end correctly receives the data packet.

The existing data transmission technology is to wait for the feedback information of the receiving end after the initial transmission of the data packet at the transmitting end. When the receiving end feeds back the AcKnowledgement (ACK) information to the transmitting end, it indicates that the data packet is successfully transmitted, and then the transmitting end The packet is no longer retransmitted. When the receiving end feeds back the error confirmation (Non_AcKnowledgement, NACK) message to the transmitting end, it indicates that the data packet transmission fails, and the transmitting end needs to retransmit the data packet to the receiving end. If the receiving end correctly receives the data packet within the specified maximum number of retransmissions, the data packet is successfully transmitted. If the receiving end does not correctly receive the data packet within the specified maximum number of retransmission times, the data packet is transmitted. Failure, the sender no longer retransmits the packet to the receiver.

In the process of implementing the above data transmission, the inventor has found that at least the following problems exist in the prior art: When transmitting a data packet, the transmitting end has to wait for a plurality of transmission time intervals (TTI), waiting for During the process of multiple TTIs, the feedback information sent by the receiving end is awaited, and according to the feedback information, whether to perform the next retransmission is determined. When a certain data packet is successfully transmitted to the receiving end through multiple retransmissions, although the receiving end correctly receives the data packet, a large delay occurs between the transmitting end and the receiving end, that is, the initial transmission from the transmitting end Packet received successfully from the receiving end There is a large amount of ττι between the packets. A large delay delays the data reception caused by the receiving end, which reduces the user experience. Summary of the invention

Embodiments of the present invention provide a method and apparatus for data transmission, which can reduce the transmission delay of a data packet.

In one aspect, an embodiment of the present invention provides a data transmission method, including:

The transmitting end initially transmits a data packet or a data packet group to the receiving end;

When the correct acknowledgement ACK information for the data packet or the data packet group sent by the receiving end is not received, the sending end retransmits the data packet or the data packet group to the receiving end at least once. The ACK information indicates that the receiving end correctly receives the data packet or the data packet group.

In another aspect, an embodiment of the present invention provides an apparatus for data transmission, including: a transmitter, configured to initially transmit a data packet or a data packet group to a receiving end;

The transmitter is further configured to retransmit the data packet or data at least once to the receiving end when the correct acknowledgement ACK information sent by the receiving end to the data packet or the data packet group is not received. a packet group, wherein the ACK information indicates that the receiving end correctly receives the data packet or the data packet group.

The method and device for data transmission provided by the embodiment of the present invention can retransmit at least one data packet or data packet group to the receiving end after initially transmitting the data packet or the data packet group to the receiving end, which can solve the prior art, The problem that the secondary retransmission must be performed after receiving the feedback information can save the time for waiting for the feedback information and reduce the transmission delay of the data. DRAWINGS

1 is a flowchart of a method for data transmission in an embodiment of the present invention;

2 is a flowchart of a method for data transmission in another embodiment of the present invention;

3 is a schematic diagram of a cartridge for data packet transmission according to an embodiment of the present invention; 4 is a schematic diagram of a cartridge of a prior art data packet transmission;

5 is a schematic diagram of a cartridge for transmitting a data packet group in the implementation of the present invention;

6 is a schematic diagram of a cartridge of a data packet group transmission in the prior art;

FIG. 7 is a schematic diagram of another tube for data transmission according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of another tube for data transmission according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of an apparatus for data transmission according to an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of an apparatus for data transmission according to an embodiment of the present invention;

FIG. 11 is a schematic structural diagram of an apparatus for data transmission according to an embodiment of the present invention;

FIG. 12 is a schematic structural diagram of an apparatus for data transmission according to an embodiment of the present invention;

FIG. 13 is a schematic structural diagram of an apparatus for data transmission according to an embodiment of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The two ends of the data exchange in the embodiment of the present invention include, but are not limited to, a base station and a user equipment (User Equipment, UE). Since the base station and the UE perform interactive data transmission, the base station and the UE are both a transmitting end and a receiving end. In the following embodiments, the sender and the receiver are represented. In the actual application, the sender and the receiver may be a base station or a UE or other device having a data transmission function.

An embodiment of the present invention provides a data transmission method. As shown in FIG. 1, the method includes the following steps:

101. The sending end initially transmits a data packet or a data packet group to the receiving end.

Taking a data packet as an example, the sender can occupy one TTI by transmitting a data packet.

For the data packet bundling technology, the transmitting end may also transmit a data packet group to the receiving end, where the number According to the packet group, multiple TT I can be occupied. For example, each packet group can continuously occupy four ΤΤ I for transmission, and each group of data packets includes four identical data packets.

102. When the ACK information of the data packet or the data packet group sent by the receiving end is not received, the sending end retransmits the data packet or the data packet group to the receiving end at least once.

Taking a data packet as an example, after the initial transmission of the data packet to the receiving end, the transmitting end can continue to retransmit the data packet to the receiving end. The number of retransmissions is at least one. The embodiment of the present invention does not limit the upper limit of the number of retransmissions.

The data transmission method provided by the embodiment of the present invention can retransmit the data packet or the data packet group to the receiving end at least once after initially transmitting the data packet or the data packet group to the receiving end, which can solve the prior art, each time Retransmissions must be performed after receiving feedback information, which saves time waiting for feedback information and reduces data transmission delay.

Further, the embodiment of the present invention further provides a method for data transmission. As shown in FIG. 2, the method is further extended to the method in FIG. 1. The method may include:

201. The sending end initially transmits a data packet or a data packet group to the receiving end.

In the case of a data packet, the sender can use one packet to transmit a packet.

For the data packet bundling technology, the transmitting end may also transmit a data packet group to the receiving end, where the data packet group may occupy multiple ΤΤ I. For example, each data packet group may continuously occupy four ΤΤ I for transmission, and each data group is transmitted. The package group contains four identical packets.

202. The sending end retransmits the data packet or the data packet group to the receiving end at least once.

Further, the sending end determines whether to receive the ACK information sent by the receiving end as a criterion for whether to perform retransmission. When the sending end receives the ACK information, the transmitting end does not retransmit the data packet to the receiving end after receiving the ACK information; if the sending end does not receive the ACK information, the sending end continues. The data packet is retransmitted to the receiving end multiple times. The ACK letter The information is the correct acknowledgement message sent by the receiving end to the transmitting end, and the information indicates that the receiving end has correctly received the data packet sent by the transmitting end.

Before receiving the data packet correctly, the receiving end may not receive the data packet correctly. The receiving end sends a NACK message to the sending end, and the NACK information is used to indicate that the receiving end fails to receive. . It should be noted here that whether the transmitting end retransmits the data packet and when the retransmission is performed does not depend on the NACK information in the embodiment of the present invention.

Further, after the step 201 is performed, the sending end may obtain the interval indication information. When the UE is the sending end, the interval indication information may be sent by the base station to the UE. The interval indication information is used to indicate the number of TTI intervals that need to be waited each time a data packet or a packet group is retransmitted.

Taking a data packet as an example, when the channel resource is sufficient to transmit a certain data packet, after the transmitting end initially transmits the data packet to the receiving end, the channel has sufficient channel resources to continuously retransmit the data packet to the receiving end. The number of TTIs in the interval indication information is zero. However, in actual applications, multiple data packets are often transmitted or used by multiple senders at the same time. In this case, an interval between the initial transmission and the retransmission of a data packet, retransmission and retransmission is required. One or more TTIs. How to allocate channel resources for multiple data packets, that is, how to determine the transmission interval between each two data packets, can be set according to actual needs, which is not limited in this embodiment.

The interval indication information is the number of ΤΤΙ intervals that need to be waited for each time a data packet is retransmitted, which needs to be stated:

1) The waiting interval for retransmitting packets can be different each time. After a packet is first transmitted, it needs to be retransmitted three times in order to be correctly received by the receiver as an example: between the first transmission and the first retransmission, between the first retransmission and the second retransmission, and the second time. The interval between the retransmission and the third retransmission can be either one, one, two, three, or one, one, or two. The embodiment of the present invention does not limit whether the interval between every two transmissions of the same data packet is equal and the number of intervals between two transmissions is not limited.

2) The interval indication information may be interval indication information for the sending end, and the sending end according to the interval indication information, according to the interval indication information, all the data packets transmitted by the transmitting end The interval TTI shown is waiting. The interval indication information may also be interval indication information for the data packet, and the sending end waits for different data packets according to different intervals indicated by the interval indication information according to the interval indication information for different data packets.

The transmitting end retransmits the data packet to the receiving end multiple times according to the interval indication information. The interval between the retransmission and the initial transmission and the interval between the retransmission and the retransmission may be specified by an interval indication information, which is before the first retransmission of the data packet by the transmitting end (ie, the initial transmission packet) After) get. The interval between the retransmission and the initial transmission and the interval between the retransmission and the retransmission may also be specified by a plurality of interval indication information, each interval indication information specifying the number of intervals required between each transmission, The interval indication information is obtained before each transmission (initial transmission or retransmission).

In the embodiment of the present invention, the number of times of retransmitting a data packet by the transmitting end is not limited, and the upper limit of the number of retransmissions may be configured according to actual application requirements.

Preferably, the sender can determine by itself whether to retransmit the data packet or the data packet group needs to wait.

ΤΤΙ Interval, that is, no need to obtain the interval indication information. Specifically, when the channel resource is sufficient to transmit a certain data packet, the transmitting end continuously retransmits the data packet; when the channel resource is insufficient to transmit a certain data packet, the transmitting end determines the interval required to retransmit the data packet each time. And retransmit the packet after waiting in accordance with the judgment.

The sender receives the ACK information sent by the receiving end as a criterion for whether to perform retransmission. When the sending end receives the ACK information, the transmitting end does not retransmit the data packet to the receiving end after receiving the ACK information; if the sending end does not receive the ACK information, the sending end according to the sending end The interval indication information continues to retransmit the data packet to the receiving end multiple times. The ACK information is correct acknowledgement information sent by the receiving end to the transmitting end, and the information indicates that the receiving end has correctly received the data packet sent by the sending end.

This embodiment can be applied to the following application scenarios, which are not limited to the embodiments of the present invention. As shown in FIG. 3, taking a continuous retransmission of a certain data packet by the transmitting end as an example: Compared with the data packet, when the channel resources are sufficient, for example, there is no need to wait for the interval between each two transmissions, The initial transmission and retransmission order of the data packet occupy ΤΤΙ 0, ΤΤΙ ΤΤΙ 2 The transmission is performed, that is, there is no TTI interval between each transmission. It is assumed that the receiving end correctly receives the data packet when the transmitting end retransmits for the third time, that is, when the data packet is correctly received on the TTI 3, the receiving end will Sending ACK information to the transmitting end on the TTI 7 (the transmitting end receives the feedback information in the fourth TTI after each transmission), in this case, the transmission delay is three TTIs, and if one TTI is 10 milliseconds, the transmission is performed. The delay is 30 milliseconds. The sender does not retransmit the packet after receiving the ACK information on the TTI 7.

In the prior art, since the feedback information of the receiving end needs to be waited before each retransmission (the feedback information is NACK information before the receiving end correctly receives the data packet), the fourth after receiving the feedback information Retransmissions are performed on the TTI, resulting in the need to have seven TTIs between transmissions. As shown in FIG. 4, the receiving end correctly receives the data packet when the receiving end retransmits for the third time, and the transmitting end sends the data packet first, the first retransmission, the second retransmission, and the like. The third retransmission occupies TTI 0, TTI 8, TTI 16, and ΤΤΙ 24 for transmission. If one ΤΤΙ is 10 milliseconds, the transmission delay in this case is 240 milliseconds. Embodiments of the present invention reduce the delay of 210 milliseconds relative to the prior art.

For the packet group in the transport packet bundling technique, as shown in FIG. 5, the sender re-transmits a packet group as an example: Compared with the packet group, when the channel resource is optimal ( That is, there is no need to wait for the interval between each transmission. The initial transmission and retransmission sequence of the packet group occupy ΤΤΙ 0- ΤΤΙ 3, ΤΤΙ4- ΤΤΙ 7, ΤΤΙ 8- TTI 11 for transmission, each transmission There is no TTI interval between them. It is assumed that the receiver correctly receives the packet group on the third retransmission at the transmitting end. That is, when the packet group is correctly received on the TTI 12-TTI 15, the receiver will send on the TTI 19 The ACK information is sent to the transmitting end (the transmitting end receives the feedback information in the fourth TTI after each transmission). In this case, the transmission delay is twelve TTIs. If a TTI is 10 milliseconds, the transmission delay is 120. millisecond. The sender does not retransmit the packet group after receiving the ACK message on the TTI 19.

In the prior art, since the feedback information of the receiving end needs to be waited before each retransmission (the feedback information is NACK information before the receiving end correctly receives the data packet group), the transmitting end The feedback information is received on the fourth TTI after each transmission, and retransmission is performed on the ninth to twelfth TTIs after receiving the feedback information, thereby causing twelve intervals between each transmission. TTI. As shown in FIG. 6 , the receiving end correctly receives the data packet group at the third retransmission of the transmitting end as an example, and the transmitting end initially transmits, first retransmits, and re-transmits the data packet group. The transmission and the third retransmission occupy ΤΤΙ 0- TTI 3, TTI 16- ΤΤΙ 19, ΤΤΙ 32-ΤΤΙ 35, and TTI48-TTI 51 respectively, and if one ΤΤΙ is 10 milliseconds, the transmission delay in this case It is 480 milliseconds. Embodiments of the present invention reduce the delay of 360 milliseconds relative to the prior art.

Optionally, when the channel resources are limited, the embodiment of the present invention can still reduce the transmission delay relative to the prior art. Specifically, the four transmissions (three retransmissions in one initial transmission) need to be separated by three 两 between the two, and the delay of receiving the data packet correctly by the receiving end is twelve ΤΤΙ, that is, 120 milliseconds, still relatively existing Technology reduces the latency of 120 milliseconds. In addition, the above prior art is a transmission mode of Hybrid Hybrid Automatic Retransmission (HQQ), that is, an interval of seven TTIs between two transmissions is used as an example, and an asynchronous HARQ method is adopted. When transmitting, there are at least seven TTIs between transmissions, and the transmission delay of the packets is larger.

It should be noted that the delay of the data packet transmission is the time interval between the sending of the data packet from the transmitting end to the correct receiving end of the data packet, rather than the time between when the data packet is sent from the transmitting end and the sending end receives the ACK information. interval. Since the receiving end correctly receives the data packet earlier than the time when the transmitting end receives the ACK information, the transmitting end retransmits the data packet after the receiving end has correctly received the data packet (fourth, five, six, Seven retransmissions) until the sender receives the ACK message. Therefore, in Figure 3, the number of retransmissions of the data packet (seven times) is greater than the number of retransmissions that the receiving end can correctly receive the data packet (three times), and that the receiving end sends the ACK information to the transmitting end four times in succession.

Optionally, the data packet or the data packet group with the priority higher than the preset level may be selectively transmitted by using the implementation manner described in the foregoing steps 201 and 202, and the data packet with the priority less than or equal to the preset level is selected. Or the packet group is transmitted using existing technology. Selecting the above-mentioned data packets or packet groups with a higher priority than the preset level under the condition of limited channel resources The implementation manners of the step 201 and the step 202 are performed to improve the transmission success rate of the data packet or the data packet group with the priority higher than the preset level, and ensure the quality of service of the user. The priority may be determined according to the delay sensitivity of the data packet or the data packet group, for example, the priority of the data packet or the data packet group is set according to the delay sensitivity of the data packet or the data packet group. For the first, second, third and so on. For voice packets or packet groups in the circuit domain service, because the delay sensitivity is high, if the transmission delay exceeds the conference, the user's call experience is affected, especially when one of the parties is performing a handover, the handover delay The accumulation of the transmission delay will double the quality of the user's call, and the voice data packet or packet group in the circuit domain service can be set as a primary data packet or a data packet group. Or, for the transmission of the online video data packet or the data packet group, the excessive transmission delay may cause the video playback of the user terminal to be unsmooth, and the user experience may be reduced, and the online video data packet or the data packet group may be set as the secondary data packet. Or a packet group. Then, the data packet or the data packet group with the priority higher than the third level, that is, the first level and the second level, may be preferentially transmitted by using the implementation manners described in the foregoing steps 201 and 202. In addition, the priority of the data packet or packet group can be set to the first level, the second level, the third level, etc. according to the size of the data packet or the data packet group, and the larger the data packet or the data packet group priority. The higher. In the data transmission process, the data content carried by the larger data packet or the data packet group is more important than the small data packet or the data packet group, and the above steps 201 and steps are preferentially applied to the larger data packet or the data packet group. The implementation described in 202 performs transmission, which can reduce the impact of data transmission failure on user service quality. The priority of the data packet or the data packet group, and the preset level may be adjusted according to the actual situation, which is not limited by the embodiment of the present invention.

Optionally, the TTI is used to determine whether the transmission resource on each TTI is smaller than a preset transmission resource threshold. When the transmission resource on a TTI is smaller than a preset transmission resource threshold, the TTI is used to prioritize A packet or packet group with a higher level than the preset level is retransmitted at least once. As shown in FIG. 7 , in an application scenario of the embodiment of the present invention, in the case of a data packet, three data packets with priority levels of primary, secondary, and tertiary are required, and one level is the highest priority. And the priority of all three packets is higher than the preset level. Suppose each packet needs to be retransmitted three times. After the transmission is successful, after the initial transmission of the primary data packet and the secondary data packet three-level data packet in the TTI0 to 分别 sequence, it is determined whether the transmission resource on the TTI3 is smaller than the preset transmission resource threshold. When the transmission resource on the TTI3 is smaller than the preset transmission resource threshold, the primary data packet is retransmitted on the TTI3, and then the transmission resource on the TTI4 is determined to be smaller than the preset transmission resource threshold, when the TTI3 is used. When the transmission resource is smaller than the preset transmission resource threshold, the secondary data packet is retransmitted on TTI3, and so on, and finally, three times of retransmission on TTI3, ΤΤΙ6, and ΤΤΙ9, the primary data packet transmission Success, after three retransmissions on TTI4, TTI7, and TTI10, the secondary data packet transmission succeeds. After three retransmissions on TTI5, TTI8, and TTI11, the three-level data packet transmission succeeds. Further, after a certain level of data packet is successfully transmitted, the next level data packet is transmitted. As shown in Figure 8, it is still assumed that each data packet needs to be retransmitted three times to be successfully transmitted. After the initial transmission of the primary data packet and the secondary data packet three-level data packet in the TTI0 to 分别 sequence, respectively, When the transmission resource on the TTI3 is smaller than the preset transmission resource threshold, the first data packet is retransmitted on the TTI 3, and when the transmission resource on the TTI4 is smaller than the preset transmission resource threshold, The second retransmission of the primary data packet is performed on the TTI4. When the transmission resource on the TTI5 is smaller than the preset transmission resource threshold, the primary data packet is retransmitted for the third time on the TTI5, and then transmitted according to the transmission. The implementation of the primary data packet transmits the secondary and tertiary data packets, that is, the secondary data packets are retransmitted three times on TTI6, ΤΤΙ7, and ΤΤΙ8, respectively, and the tertiary data packets are respectively on TTI9, TTI10, and TTI11. Perform three retransmissions. The application scenario of the embodiment of the present invention is described by taking a transmission data packet as an example. The transmission data packet group may be implemented according to the characteristics of the data packet group and according to the implementation manner of the transmission data packet, which is not performed by the embodiment of the present invention. Narration.

Further, in another application scenario of the embodiment of the present invention, when it is determined that there is sufficient channel resource, the sending end may retransmit the data packet or the data packet group to the receiving end at least once on the assigned TTI. . Sufficient channel resources are the channel resources at least one packet of data packets can be transmitted after the one (or more) packets or groups of packets are originally transmitted. When a packet or packet group is transmitted, it does not affect the load of the base station, as long as there is a remaining letter. The channel resource retransmits the data packet or the data packet group by using the remaining channel resource, increases the number of retransmissions of the data packet or the data packet group, and further improves the success rate of the data packet or the data packet group transmission.

Further, in another application scenario of the embodiment of the present invention, the number of retransmissions, the data packet with high priority, or the data may be set for the data packet or the data packet group according to the priority of the data packet or the data packet group. The number of retransmissions of a packet group is greater than the number of retransmissions of a packet with a lower priority or a packet group. Specifically, the number of retransmissions of the data packet or the data packet group may be set according to the size of the data packet or the data packet group or the delay sensitivity, and the number of retransmissions of the data packet or the data packet group with high data packet or high delay sensitivity is set. A packet or group of packets that is larger than the packet size or has low latency sensitivity. When the number of retransmissions of a certain data packet or packet group exceeds the preset number of retransmissions, even if the receiving end does not correctly receive the data packet or the data packet group, the data packet or the data packet group is no longer heavy. Pass, thus ensuring the transmission of other data packets or groups of packets with limited transmission resources.

The data transmission method provided by the embodiment of the present invention can retransmit the data packet or the data packet group to the receiving end at least once after the data packet or the data packet group is initially transmitted to the receiving end, which can solve the prior art. Each retransmission must be performed after receiving feedback. Since the transmitting end waits for the feedback information and retransmits the data packet or the data packet group according to the feedback information, the embodiment of the present invention can save the waiting feedback information and retransmit the data packet or the data packet according to the feedback information. The time of the group can reduce the delay of data transmission.

In addition, the data transmission method provided by the embodiment of the present invention can also stop retransmitting a data packet or a data packet group when receiving the ACK information sent by the receiving end, and allocate the saved channel resources to other data packets or data packet groups. , can optimize the configuration of channel resources.

In addition, the data transmission method provided by the embodiment of the present invention can also adopt the technical solution provided by the embodiment in the case of a limited time-sensitive or large data packet or a data packet group under the condition that the channel resources are limited. The characteristics of the user's business are refined to enhance the user experience.

Referring to the implementation of the method embodiment shown in FIG. 1, an embodiment of the present invention provides a device, as shown in FIG. 9, for implementing the method embodiment shown in FIG. 2. The device includes but is not limited to a base station and a UE, and the device includes: The transmitter 91 is configured to initially transmit a data packet or a data packet group to the receiving end.

Taking a data packet as an example, the transmitter 91 transmits a data packet and occupies a transmission time interval TTI.

For the packet binding technology, the transmitter 91 may also transmit a data packet group to the receiving end, where the data packet group may occupy multiple ports. For example, each data packet group may continuously occupy four ports for transmission, and each group The packet group contains four identical packets.

The transmitter 91 is further configured to retransmit the data packet or the data packet group to the receiving end at least once when the correct acknowledgement ACK information for the data packet or the data packet group sent by the receiving end is not received. The ACK information indicates that the receiving end correctly receives the data packet or the data packet group.

Further, as shown in FIG. 10, the apparatus may further include:

The obtaining unit 1001 is configured to obtain interval indication information, where the interval indication information is a number of times that the data packet or the data packet group needs to wait for each retransmission.

The transmitter 91 is further configured to retransmit the data packet or the data packet group to the receiving end according to the interval indication information received by the receiver 1001.

Taking a data packet as an example, when the channel resource is sufficient to transmit a certain data packet, the transmitter 91 has sufficient channel resources to continuously retransmit the data packet to the receiving end after initial transmission of the data packet to the receiving end. The number of ΤΤΙ in the interval indication information is zero. However, in actual applications, multiple data packets are often transmitted or multiple pairs of base stations and receivers are used at the same time. In this case, an interval between the initial transmission and the retransmission of a data packet, retransmission and retransmission is required. One or more defects. Intervals are used to transfer other packets. For example, how to allocate channel resources for a plurality of data packets, that is, how to determine the transmission interval between each of the two data packets, may be set according to actual needs, which is not limited in this embodiment.

1) The waiting interval for retransmitting packets can be different each time. After a packet is first transmitted, it needs to be retransmitted three times to be received by the receiver as an example: between the first transmission and the first retransmission, the first time The interval between the retransmission and the second retransmission and between the second retransmission and the third retransmission may be either a TTI or one, two, three TTIs, or One, one, two TTIs. The embodiment of the present invention does not limit whether the interval between every two transmissions of the same data packet is equal and the number of intervals between two transmissions is not limited.

2) The interval indication information may be interval indication information for the sender, and the sender waits for all the data packets transmitted by the sender according to the interval indication information according to the interval indicated by the interval indication information. The interval indication information may also be interval indication information for the data packet, and the sender waits for different packets according to the interval indication information for different data packets according to different intervals indicated by the interval indication information.

Optionally, the data packet or the data packet group with the priority higher than the preset level may be selectively transmitted by using the implementation manner described in the foregoing steps 201 and 202, and the data packet with the priority less than or equal to the preset level is selected. Or the packet group is transmitted using existing technology. Under the condition that the channel resources are limited, the data packet or the data packet group with the priority higher than the preset level is selectively transmitted by using the implementation manner shown in FIG. 2, and the data packet with the priority higher than the preset level may be improved or The success rate of the packet group is transmitted to ensure the quality of service of the user. The priority may be determined according to the delay sensitivity of the data packet or the data packet group, for example, the priority of the data packet or the data packet group is set according to the delay sensitivity of the data packet or the data packet group. For the first, second, third and so on. For voice packets or packet groups in the circuit domain service, due to the high degree of delay, if the transmission delay exceeds the conference, the user's call experience is affected, especially when one of the parties is performing a handover, the handover delay is The accumulation of the transmission delay will double the quality of the user's call, and the voice data packet or packet group in the circuit domain service can be set as a primary data packet or a data packet group. Or, for the transmission of the online video data packet or the data packet group, the excessive transmission delay may cause the video playback of the user terminal to be unsmooth, and the user experience may be reduced, and the online video data packet or the data packet group may be set as the secondary data packet. Or a packet group. Then, the data packet or the data packet group with the priority higher than the third level, that is, the first level and the second level, can be preferentially transmitted by using the implementation manner shown in FIG. In addition, you can prioritize packets or groups of packets based on the size of the packet or group of packets. From high to low, it is set to level 1, level 2, level 3, etc. The larger the packet or packet group is, the higher the priority. In the data transmission process, the data content carried by the larger data packet or the data packet group is more important than the small data packet or data packet group, and the larger data packet or data packet group is preferentially used as shown in FIG. 2 . Implementation mode transmission can reduce the impact of data transmission failure on user service quality. The priority of the data packet or the data packet group, and the preset level may be adjusted according to the actual situation, which is not limited by the embodiment of the present invention.

Further, as shown in FIG. 11, the device further includes:

The first determining unit 1101 is configured to determine whether the transmission resource is smaller than a preset transmission resource threshold.

When the first determining unit 1101 determines that the transmission resource is smaller than a preset transmission resource threshold, the transmitter 91 is further configured to: use a data packet or a data packet group with a priority higher than a preset level or The packet group performs at least one retransmission to the receiving end.

Further, as shown in FIG. 12, the apparatus may include:

The second determining unit 1201 is configured to determine whether there are enough channel resources.

The transmitter 91 is further configured to retransmit the data packet or the data packet group to the receiving end at the assigned transmission time interval TTI when the second determining unit 1201 determines that there is sufficient channel resource. Sufficient channel resources are the channel resources at least one packet of data packets can be transmitted after the one (or more) packets or groups of packets are originally transmitted.

The transmitter 91 may retransmit at least one packet or group of packets to the receiving end on the assigned TTI when there is sufficient channel resources. Without affecting the load of the base station, as long as the remaining channel resources exist, the remaining channel resources are used to retransmit the data packet or the data packet group, and the number of retransmissions of the data packet or the data packet group is increased, thereby further improving the data packet or data. The success rate of packet transmission.

Further, as shown in FIG. 13, the apparatus may include:

The setting unit 1301 is configured to set a retransmission times for the data packet or the data packet group according to the priority of the data packet or the data packet group, and the retransmission times of the high priority data packet or the data packet group are greater than the priority. The number of retransmissions of a low packet or packet group.

The setting unit 1 301 can set the number of retransmissions of the data packet or the data packet group according to the size or delay sensitivity of the data packet or the data packet group, and the data packet or the data packet group with high data packet or high delay sensitivity. The number of retransmissions is greater than a packet or packet group with a small packet or low latency sensitivity.

The transmitter 91 is further configured to retransmit the data packet or the data packet group according to the number of retransmissions set by the setting unit 1 301. When the number of retransmissions of a certain data packet or a data packet group exceeds a preset number of retransmissions, even if the transmitter 91 does not correctly receive the data packet or the data packet group, the data packet or the data packet is no longer used. The group retransmits to ensure that other data packets or groups of packets are transmitted using limited transmission resources.

The device provided by the embodiment of the present invention can retransmit the data packet or the data packet group to the receiving end at least once after initially transmitting the data packet or the data packet group to the receiving end, which can solve the prior art, each time heavy Passing questions that must be made after receiving feedback. Since the transmitting end waits for the feedback information and retransmits the data packet or the data packet group according to the feedback information, there is a certain delay (the sum of the two delays in this embodiment is seven TTIs), and the embodiment of the present invention can save waiting for feedback. The information and the time at which the data packet or packet group is retransmitted based on the feedback information can reduce the delay of data transmission.

In addition, the apparatus provided by the embodiment of the present invention can stop retransmitting a data packet or a data packet group when receiving the ACK information sent by the receiving end, and allocate the saved channel resources to other data packets or data packet groups, which can be optimized. Configuration of channel resources.

In addition, the device provided by the embodiment of the present invention can also preferentially adopt the technical solution provided by the embodiment in the case of a limited time-sensitive or large data packet or a data packet group, and can be used for user services. Features are refined to enhance the user experience.

It can be clearly understood by those skilled in the art that for the convenience and cleanness of the description, only the division of each functional module described above is exemplified. In practical applications, the above function assignment can be completed by different functional modules as needed. The internal structure of the device Divided into different functional modules to complete all or part of the functions described above. For the specific working process of the system, the device and the unit described above, refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided herein, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be used. Combined or can be integrated into another system, or some features can be ignored, or not executed. In addition, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus necessary general hardware, and of course, by hardware, but in many cases, the former is a better implementation. . Based on such understanding, the computer software product of the present invention is stored in a readable storage medium, such as a floppy disk, a hard disk or an optical disk of a computer, and includes a plurality of instructions for causing a computer device (which may be an individual) A computer, server, or network device, etc., performs the methods described in various embodiments of the present invention.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Rights request

A data transmission method, comprising:

The data transmission method according to claim 1, wherein before the transmitting end initially transmits a data packet or a data packet group to the receiving end, the method further includes:

The sending end acquires the interval indication information, where the interval indication information is a transmission time interval TTI that needs to be waited for each time the data packet or the data packet group is retransmitted;

Retransmitting the data packet or the data packet group to the receiving end at least once, the method includes: the sending end retransmitting the data packet or the data packet to the receiving end at least once according to the interval indication information group.

The data transmission method according to claim 1, wherein the transmitting end retransmits the data packet or the data packet group to the receiving end at least once, including:

The transmitting end retransmits the data packet or the data packet group with the priority higher than the preset level in the data packet or the data packet group to the receiving end at least once.

The data transmission method according to claim 3, wherein the priority is determined according to a delay sensitivity of a data packet or a data packet group, wherein a delay of the data packet or the data packet group The higher the sensitivity, the higher the priority of the data packet or packet group.

The data transmission method according to claim 3, wherein the priority is determined according to a size of a data packet or a data packet group, wherein the data packet or the data packet group is larger, the data is The higher the priority of a packet or packet group.

The data transmission method according to any one of claims 3 to 5, characterized in that Before the transmitting end performs at least one retransmission of the data packet or the data packet group with the priority higher than the preset level in the data packet or the data packet group to the receiving end, the sending terminal includes:

Determining that the transmission resource is smaller than the preset transmission resource threshold.

The data transmission method according to any one of claims 1 to 6, wherein the transmitting end retransmits the data packet or the data packet group to the receiving end at least once, including:

When it is determined that there is sufficient channel resource, the transmitting end retransmits the data packet or the data packet group to the receiving end at least once on the assigned TTI.

Set the number of retransmissions for the data packet or the data packet group according to the priority of the data packet or the data packet group, and the number of retransmissions of the high priority data packet or the data packet group is greater than the priority of the low priority data packet or the data packet group. Number of retransmissions;

The data packet or packet group is retransmitted according to the set number of retransmissions.

9. A data transmission device, comprising:

a transmitter, configured to initially transmit a data packet or a data packet group to the receiving end;

The data transmission device according to claim 9, wherein the device further comprises:

An obtaining unit, configured to acquire interval indication information;

The transmitter is further configured to retransmit the data packet or the data packet group to the receiving end at least once according to the interval indication information.

The data transmission device according to claim 9, wherein the transmitter is further configured to: use a data packet or a packet with a priority higher than a preset level in the data packet or the data packet group. Performing at least one retransmission to the receiving end according to the packet group, where the priority is determined according to a delay sensitivity of the data packet or the data packet group, wherein the delay sensitivity of the data packet or the data packet group is more The higher the priority of the data packet or the data packet group, or the priority is determined according to the size of the data packet or the data packet group, where the data packet or the data packet group is larger, the The higher the priority of a packet or packet group.

The data transmission device according to claim 9, further comprising: a first determining unit, configured to determine that the transmission resource is smaller than the preset transmission resource threshold; And determining, when the transmission resource is smaller than the preset transmission resource threshold, the transmitter is further configured to: use, in the data packet or the data packet group, a data packet or a data packet group with a higher priority than a preset level. Performing at least one retransmission to the receiving end.

The data transmission device according to any one of claims 9 to 12, further comprising:

a second determining unit, configured to determine whether there are enough channel resources;

And when the second determining unit determines that there is sufficient channel resource, the transmitter is further configured to retransmit the data packet or the data packet group to the receiving end at least once on the assigned transmission time interval TTI.

a setting unit, configured to set a retransmission number for the data packet or the data packet group according to a priority of the data packet or the data packet group, where the retransmission number of the high priority data packet or the data packet group is greater than the data packet with the lower priority priority Or the number of retransmissions of the packet group;

The transmitter is further configured to retransmit the data packet or the data packet group according to the set number of retransmissions.

The data transmission device according to any one of claims 9 to 14, wherein the data transmission device is a base station or a user equipment.