CN107135051B - Method, device and system for retransmitting uplink data - Google Patents

Method, device and system for retransmitting uplink data Download PDF

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CN107135051B
CN107135051B CN201610113342.3A CN201610113342A CN107135051B CN 107135051 B CN107135051 B CN 107135051B CN 201610113342 A CN201610113342 A CN 201610113342A CN 107135051 B CN107135051 B CN 107135051B
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retransmission
enb
uplink data
state
feedback
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CN107135051A (en
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李娜
陈卓
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China Mobile Communications Group Co Ltd
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China Mobile Communications Group Co Ltd
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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
    • H04L1/1858—Transmission or retransmission of more than one copy of acknowledgement message
    • 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
    • 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
    • H04L1/189—Transmission or retransmission of more than one copy of a message

Abstract

The embodiment of the invention discloses a method, equipment and a system for retransmitting uplink data; the method can comprise the following steps: user Equipment (UE) acquires a feedback state of an evolved node eNB in a leappable uplink transmission time period; and the UE retransmits the uplink data according to a preset retransmission strategy according to the feedback state of the eNB and the transmission state of the uplink data of the UE. Therefore, when the UE skips the uplink transmission time, the waste of retransmission resources is avoided.

Description

Method, device and system for retransmitting uplink data
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method, a device, and a system for uplink data retransmission.
Background
In a Long Term Evolution (LTE) system, an evolved node b (eNB) allocates uplink resources to a User Equipment (UE) based on a Buffer Status Report (BSR) reported by the UE. And the UE performs uplink data transmission on the uplink resources allocated by the eNB. The eNB checks the received uplink data, thereby determining whether the UE needs to retransmit the data. And the eNB feeds back ACK/NACK information to the UE based on the CRC check result, and allocates uplink resources (UL Grant) for retransmission to the UE if necessary. So that the UE initiates uplink data retransmission on the retransmission resource indicated by the eNB.
Therefore, in the current prior art, the UE must perform data transmission on the uplink resource allocated by the eNB, because the uplink resource is requested from the eNB when the UE has a transmission requirement; the eNB always feeds back a Hybrid Automatic Repeat reQuest (HARQ) result, i.e., the ACK/NACK message, regardless of the success or failure of data reception. If the UE does not receive the HARQ feedback from the eNB for a period of time, the UE considers that the previously transmitted data does not arrive at the eNB, and the UE will automatically retransmit the data. Specifically, the UE determines the uplink data retransmission mode based on a received Physical Hybrid ARQ Indicator Channel (PHICH) and a Physical Downlink Control Channel (PDCCH), including new transmission, adaptive retransmission, non-adaptive retransmission, and delayed retransmission. Since the UE transmits only according to the scheduling requirements of the eNB, the uplink data retransmission scheme actually selected is determined by the eNB.
Currently, to support fast uplink access, the eNB may allocate more uplink resources to the UE, for example, configure resources through Scheduling-based resources or Semi-Persistent Scheduling (SPS), and the UE may not transmit any data to the eNB when there is no uplink data to be transmitted, and at this time, the UE may allow to skip retransmission resources for uplink data transmission. This will lead to the following problems: the eNB does not receive uplink data on the uplink resources allocated to the UE, which will not be able to distinguish whether the UE does not transmit uplink data or the eNB fails to verify. According to the existing protocol, the eNB feeds back NACK, instructs the UE to perform non-adaptive retransmission and reserves corresponding uplink retransmission resources for the UE. And when the UE does not send Uplink data, the UE does not read PHICH feedback corresponding to a Physical Uplink Shared Channel (PUSCH) resource, and thus does not use a retransmission resource. A large amount of PHICH resources and PUSCH retransmission resources are wasted.
Disclosure of Invention
In order to solve the above technical problems, embodiments of the present invention are intended to provide a method, a device, and a system for uplink data retransmission, which can avoid causing waste of retransmission resources when a UE skips uplink transmission time.
The technical scheme of the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a method for uplink data retransmission, where the method includes:
user Equipment (UE) acquires a feedback state of an evolved node eNB in a leappable uplink transmission time period;
and the UE retransmits the uplink data according to a preset retransmission strategy according to the feedback state of the eNB and the transmission state of the uplink data of the UE.
In the above scheme, the acquiring, by the UE, the feedback state of the eNB includes: the UE receives a NACK message sent by the eNB;
correspondingly, the UE performs uplink data retransmission according to a preset retransmission policy according to the feedback state of the eNB and the transmission state of its own uplink data, and specifically includes:
the UE corrects the retransmission resource position according to the semi-persistent scheduling SPS period length and the round trip time RTT length of the hybrid automatic retransmission request HARQ to obtain a corrected retransmission resource position; wherein, the corrected retransmission resource position is the first SPS configuration resource position after the HARQ RTT;
and the UE retransmits the uplink data at the corrected retransmission resource position.
In the above scheme, the acquiring, by the UE, the feedback state of the eNB includes:
the UE sets the maximum retransmission times of the HARQ to be 1;
the UE receives a protocol data unit PDU of a radio link control sub-layer RLC state sent by the eNB; the PDU in the RLC state is used for indicating RLC data needing to be retransmitted by the UE;
correspondingly, the UE performs uplink data retransmission according to a preset retransmission policy according to the feedback state of the eNB and the transmission state of its own uplink data, and specifically includes: and the UE sends the RLC data needing to be retransmitted on the SPS configuration resources according to the PDU in the RLC state.
In the above scheme, the acquiring, by the UE, the feedback state of the eNB includes: the UE does not receive HARQ feedback of the eNB within a fixed time period after the uplink data is sent;
correspondingly, the UE performs uplink data retransmission according to a preset retransmission policy according to the feedback state of the eNB and the transmission state of its own uplink data, and specifically includes:
and when the UE does not receive the HARQ feedback of the eNB within a fixed time period after the uplink data is sent, the UE retransmits the uplink data on the first SPS configuration resource after the fixed time period.
In a second aspect, an embodiment of the present invention provides a method for uplink data retransmission, where the method includes:
in the time period of uplink transmission which can be skipped by User Equipment (UE), an evolved node eNB carries out retransmission feedback to the UE;
and the eNB receives the uplink data retransmitted by the UE according to the feedback state and the sending state of the uplink data of the UE.
In the foregoing scheme, the performing, by the eNB, retransmission feedback to the UE specifically includes: the eNB sends a NACK message to the UE;
correspondingly, the eNB receiving the uplink data retransmitted by the UE according to the HARQ feedback state and the transmission state of the uplink data of the UE specifically includes: and the eNB receives uplink data retransmitted at the corrected retransmission resource position after the retransmission resource position is corrected by the UE.
In the foregoing scheme, the performing, by the eNB, retransmission feedback to the UE specifically includes: the eNB sends a Protocol Data Unit (PDU) of a radio link control sublayer (RLC) state to the UE;
correspondingly, the receiving, by the eNB, the uplink data retransmitted by the UE according to the feedback state and the sending state of the uplink data of the UE specifically includes:
the eNB receives RLC data requiring retransmission sent by the UE on SPS configuration resources in accordance with RLC status PDUs.
In the foregoing scheme, the performing, by the eNB, retransmission feedback to the UE specifically includes: the eNB does not feed back NACK information, and feeds back ACK information only after correctly receiving data;
correspondingly, the eNB receiving the uplink data retransmitted by the UE according to the HARQ feedback state and the transmission state of the uplink data of the UE specifically includes:
and the eNB receives the uplink data retransmitted by the UE on the first SPS configuration resource after the fixed time period.
In a third aspect, an embodiment of the present invention provides a user equipment UE, where the UE includes: the device comprises a timing module, an acquisition module and a retransmission module; wherein the content of the first and second substances,
the timing module is configured to time a time period of uplink transmission that can be skipped by the UE, and trigger the obtaining module during the time period;
the acquiring module is used for acquiring the feedback state of the eNB;
and the retransmission module is used for retransmitting the uplink data according to a preset retransmission strategy according to the feedback state of the eNB and the sending state of the uplink data of the UE.
In the foregoing scheme, the acquiring module is configured to receive a NACK message sent by the eNB;
correspondingly, the retransmission module is specifically configured to:
correcting the retransmission resource position according to the semi-persistent scheduling SPS period length and the round trip time RTT length of the hybrid automatic retransmission request HARQ to obtain a corrected retransmission resource position; wherein, the corrected retransmission resource position is the first SPS configuration resource position after the HARQ RTT;
and retransmitting uplink data at the corrected retransmission resource position.
In the above scheme, the obtaining module is configured to set a maximum retransmission number of the HARQ to 1;
and receiving a protocol data unit PDU of a radio link control sublayer RLC state sent by the eNB; the PDU in the RLC state is used for indicating the RLC data which needs to be retransmitted by the retransmission module;
accordingly, the retransmission module is specifically configured to send, on the SPS configuration resource, the RLC data that needs to be retransmitted according to the PDU in the RLC state.
In the above scheme, the obtaining module is configured to trigger the retransmission module when the UE does not receive the HARQ feedback of the eNB within a fixed time period after the UE completes sending the uplink data;
correspondingly, the retransmission module is configured to retransmit the uplink data on the first SPS configuration resource after the fixed time period.
In a fourth aspect, an embodiment of the present invention provides an eNB, where the eNB includes: a feedback module and a receiving module, wherein,
the feedback module is used for carrying out retransmission feedback on the UE;
and the receiving module is used for receiving the uplink data retransmitted by the UE according to the feedback state and the sending state of the uplink data of the UE.
In the foregoing scheme, the feedback module is specifically configured to: sending a NACK message to the UE;
correspondingly, the receiving module is specifically configured to receive uplink data retransmitted at the corrected retransmission resource location after the retransmission resource location is corrected by the UE.
In the foregoing scheme, the feedback module is specifically configured to: sending a Protocol Data Unit (PDU) of a radio link control sublayer (RLC) state to the UE;
accordingly, the receiving module is specifically configured to receive RLC data that needs to be retransmitted and is sent by the UE on SPS configuration resources according to the PDU in the RLC state.
In the foregoing scheme, the feedback module is specifically configured to: not feeding back NACK information, and feeding back ACK information only after data is correctly received;
correspondingly, the receiving module is specifically configured to receive uplink data retransmitted by the UE on the first SPS configuration resource after the fixed time period.
In a fifth aspect, an embodiment of the present invention provides a system for uplink data retransmission, where the system includes a user equipment UE and an evolved node eNB; wherein the content of the first and second substances,
the UE is used for acquiring the feedback state of the eNB in a leappable uplink transmission time period;
and retransmitting the uplink data according to a preset retransmission strategy according to the feedback state of the eNB and the transmission state of the uplink data per se;
the eNB is used for carrying out retransmission feedback on the UE;
and receiving the uplink data retransmitted by the UE according to the retransmission feedback state and the sending state of the uplink data of the UE.
The embodiment of the invention provides a method, equipment and a system for retransmitting uplink data; when the UE retransmits the uplink data, the sending state of the UE can be considered, so that the preset retransmission strategy can be set by taking uplink resource waste as a standard. Therefore, the waste of retransmission resources can be avoided.
Drawings
Fig. 1 is a schematic view of an application scenario provided in an embodiment of the present invention;
fig. 2 is a flowchart illustrating a method for retransmitting uplink data according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating another uplink data retransmission method according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating a subframe for uplink data retransmission in the prior art;
fig. 5 is a schematic diagram of a subframe for uplink data retransmission according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a subframe of another uplink data retransmission according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a subframe for another uplink data retransmission according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a UE according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of an eNB according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a system for uplink data retransmission according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Referring to fig. 1, an application scenario provided in the embodiment of the present invention includes a user equipment UE on a terminal side and an evolved node eNB on a network side. The technical solution of the embodiment of the present invention is explained based on the application scenario shown in fig. 1.
Example one
Referring to fig. 2, it illustrates a method for uplink data retransmission provided in an embodiment of the present invention, where the method is applied to a UE on a terminal side, and the method may include:
s201: the UE acquires the feedback state of the eNB in the time period of the leappable uplink transmission;
s202: and the UE retransmits the uplink data according to a preset retransmission strategy according to the feedback state of the eNB and the transmission state of the uplink data of the UE.
It should be noted that the "time period of the skipped uplink transmission" may be considered as that, if the UE has no uplink data to transmit in a preset time period, the uplink SPS resource allocated by the eNB may not be used. Therefore, such a preset time period may be referred to as a "time period for uplink transmission that can be skipped".
It can be understood that the terminal adjusts the retransmission resource according to the preset retransmission policy, that is, only the pre-allocated SPS resource is used for data retransmission, so that the preset retransmission policy can be set based on the criterion of avoiding uplink resource waste. Therefore, the waste of retransmission resources can be avoided.
In a specific implementation process, for different feedback states of the eNB, correspondingly, the step of retransmitting the uplink data by the UE according to a preset retransmission policy according to the feedback state of the eNB and the transmission state of the uplink data of the UE may include the following three ways.
Optionally, the obtaining, by the UE, the feedback state of the eNB includes: the UE receives a NACK message sent by the eNB;
correspondingly, the UE performs uplink data retransmission according to a preset retransmission policy according to the feedback state of the eNB and the transmission state of its own uplink data, and specifically includes:
the UE corrects the retransmission resource position according to the semi-persistent scheduling SPS period length and the Round-trip time delay (RTT) length of the hybrid automatic retransmission request HARQ to obtain the corrected retransmission resource position; wherein, the corrected retransmission resource position is the first SPS configuration resource position after the HARQ RTT;
and the UE retransmits the uplink data at the corrected retransmission resource position.
Optionally, the obtaining, by the UE, the feedback state of the eNB includes:
the UE sets the maximum retransmission times of the HARQ to be 1;
and the UE receives a Protocol Data Unit (PDU) in a Radio Link Control sub-layer (RLC) state sent by the eNB; the PDU in the RLC state is used for indicating RLC data needing to be retransmitted by the UE;
correspondingly, the UE performs uplink data retransmission according to a preset retransmission policy according to the feedback state of the eNB and the transmission state of its own uplink data, and specifically includes: and the UE sends the RLC data needing to be retransmitted on the SPS configuration resources according to the PDU in the RLC state.
Optionally, the obtaining, by the UE, the feedback state of the eNB includes: the UE does not receive HARQ feedback of the eNB within a fixed time period after the uplink data is sent;
correspondingly, the UE performs uplink data retransmission according to a preset retransmission policy according to the feedback state of the eNB and the transmission state of its own uplink data, and specifically includes:
and when the UE does not receive the HARQ feedback of the eNB within a fixed time period after the uplink data is sent, the UE retransmits the uplink data on the first SPS configuration resource after the fixed time period.
According to the uplink data retransmission method applied to the UE at the terminal side, the sending state of the UE can be considered when the UE retransmits the uplink data, so that the preset retransmission strategy can be set by taking uplink resource waste as a standard. Therefore, the waste of retransmission resources can be avoided.
Example two
Based on the same technical concept of the foregoing embodiment, referring to fig. 3, it shows a method for uplink data retransmission provided in an embodiment of the present invention, where the method is applied to an eNB on a network side, and the method may include:
s301: in the time period of uplink transmission which can be skipped by User Equipment (UE), the eNB carries out retransmission feedback to the UE;
s302: and the eNB receives the uplink data retransmitted by the UE according to the feedback state and the transmission state of the uplink data of the UE.
It can be understood that, on the basis of the technical solution of the foregoing embodiment, for different retransmission feedback states of the eNB, correspondingly, the eNB receives uplink data retransmitted by the UE according to the feedback state and the transmission state of the uplink data of the UE, which may include the following three manners.
Optionally, the eNB performs retransmission feedback to the UE, which specifically includes: the eNB sends a NACK message to the UE;
correspondingly, the eNB receiving the uplink data retransmitted by the UE according to the HARQ feedback state and the transmission state of the uplink data of the UE specifically includes: and the eNB receives the uplink data retransmitted at the corrected retransmission resource position after the retransmission resource position is corrected by the UE.
Optionally, the eNB performs retransmission feedback to the UE, which specifically includes: the eNB sends a protocol data unit PDU of a radio link control sublayer RLC state to the UE;
correspondingly, the eNB receiving the uplink data retransmitted by the UE according to the feedback state and the sending state of the uplink data of the UE specifically includes:
the eNB receives RLC data to be retransmitted, transmitted by the UE on SPS configuration resources, in accordance with the PDU in RLC state.
Optionally, the eNB performs HARQ feedback to the UE, which specifically includes: the eNB does not feed back the NACK message, and feeds back the ACK message only after correctly receiving the data;
correspondingly, the eNB receiving the uplink data retransmitted by the UE according to the HARQ feedback state and the transmission state of the uplink data of the UE specifically includes:
and the eNB receives uplink data retransmitted by the UE on the first SPS configuration resource after the fixed time period.
The uplink data retransmission method applied to the network side eNB provided by the embodiment of the invention receives the uplink data retransmitted by the UE after considering the transmission state of the UE. Thereby avoiding the waste of retransmission resources.
EXAMPLE III
Based on the technical concepts of the two embodiments, the present embodiment takes three specific embodiments as an example to describe the technical solutions of the two embodiments.
Detailed description of the preferred embodiment
And after receiving the NACK message sent by the eNB, the UE corrects the retransmission resource position according to the SPS period length and the HARQ RTT length, wherein the corrected retransmission resource position is the first SPS configuration resource position after the HARQ RTT, and the UE retransmits uplink data to the eNB at the corrected retransmission position.
Setting the HARQ RTT duration to be 8ms, and the SPS period to be 3ms, as shown in fig. 4, in the prior art, the UE may send uplink resources on SPS configuration resources, and meanwhile, the eNB may additionally reserve some retransmission resources for the UE, for example, for the case of uplink subframe 1 and the HARQ RTT duration of 8ms, the reserved retransmission resources are subframes 9, 17, and 25. If the uplink data on subframe 1 is not successfully transmitted, the UE may continue to transmit the data that was not successfully transmitted on subframe 1 on subframe 9, 17, or 25. Similarly, the eNB may also reserve retransmission resources for other SPS configuration resources. Since the UE may not transmit data when there is no uplink data transmission, the eNB cannot distinguish whether the UE has not transmitted data or transmitted data in a certain subframe, but the eNB has not received the data. Therefore, the eNB may allocate retransmission resources for each SPS resource of the UE, resulting in a large amount of retransmission resource waste.
Therefore, based on the HARQ RTT duration and the SPS period shown in fig. 4, as shown in fig. 5, according to the prior art, if the UE transmits uplink data in subframe 1 and receives NACK feedback in subframe 5, the UE needs to transmit retransmission data in subframe 9. In order to avoid the waste of retransmission resources, the UE may modify the retransmission resource position, and modify the retransmission position by an offset value offset of 1ms, where the first SPS configuration resource position after the HARQ RTT is the modified retransmission resource position, and as shown in the subframe indicated by the downward arrow in fig. 5, the UE may perform uplink data retransmission at the modified retransmission resource position.
As can be seen from comparison between fig. 5 and fig. 4, the UE retransmits the uplink data at the corrected retransmission resource position without consuming extra PHICH resource and retransmission PUSCH resource by the eNB, thereby avoiding resource waste.
It can be understood that, in this embodiment, the UE does not need to detect the PDCCH, and the location of the uplink retransmission resource is the first SPS configuration resource after the synchronous non-adaptive retransmission resource in the prior art, so that a large amount of resources are saved.
It should be noted that, if more than one uplink retransmission data are desired to be transmitted on a certain uplink retransmission resource, the UE may determine the transmission order of the uplink retransmission data.
Detailed description of the invention
The UE sets the maximum retransmission times of the HARQ to be 1 in a time period of the skippable uplink transmission and receives a protocol data unit PDU of a radio link control sublayer RLC state sent by the eNB; and transmitting RLC data needing retransmission on the SPS configuration resources according to the PDU in the RLC state; the PDU of the RLC state is used for indicating the RLC data needing to be retransmitted by the UE.
At this time, the UE does not perform HARQ retransmission, and only ensures reliable reception of data through RLC layer ARQ retransmission.
As shown in fig. 6, since the UE does not perform HARQ retransmission, and the SPS period length is set to 2ms, the UE preferentially transmits retransmission data on SPS configuration resources after receiving the PDU in the RLC state transmitted by the eNB in subframe 8.
By the technical scheme of the specific embodiment, the UE preferentially sends retransmission data on the SPS configuration resources after receiving the PDU in the RLC state sent by the eNB, so that the eNB is saved from allocating additional uplink retransmission resources for the UE.
Detailed description of the preferred embodiment
And in the time period of the uplink transmission which can be skipped, the UE does not receive the HARQ feedback of the eNB in the fixed time period after the uplink data is sent, and then the UE retransmits the uplink data on the first SPS configuration resource after the fixed time period.
It should be noted that, if the eNB does not receive uplink data or the CRC check fails, the current prior art needs the eNB to perform HARQ feedback. In this embodiment, the eNB may be allowed to perform only ACK feedback, and need not perform NACK feedback on CRC check failure.
As shown in fig. 7, the eNB receives and ACK-feeds back a transport block 1(TB1) uploaded by the UE on subframe 5. But the eNB did not receive TB2 or failed the CRC check for TB2, so the eNB would not feedback a NACK for TB 2. And when the UE does not receive the ACK feedback of the eNB to the TB2 in the fixed time period T, retransmitting the TB2 on the first SPS configuration resource after the fixed time period.
By the technical solution of the present embodiment, the UE can automatically retransmit the transport block that has not received the feedback within a fixed time period, and therefore, the waste of resource configuration performed by the eNB can be reduced by setting the fixed time period.
By combining the above three specific embodiments, in the technical solution of the embodiments of the present invention, when the UE performs uplink data retransmission, the transmission state of the UE itself can be considered, so that the preset retransmission policy can be set based on the criterion of avoiding uplink resource waste. Therefore, the waste of retransmission resources can be avoided.
Example four
Based on the same technical concept of the foregoing embodiments, referring to fig. 8, which illustrates a structure of a UE80 provided by an embodiment of the present invention, a UE80 may include: a timing module 801, an obtaining module 802 and a retransmission module 803; wherein the content of the first and second substances,
the timing module 801 is configured to time a time period of uplink transmission that can be skipped by the UE80, and trigger the obtaining module 802 during the time period;
the obtaining module 802 is configured to obtain a feedback state of an eNB;
the retransmission module 803 is configured to perform uplink data retransmission according to a preset retransmission policy according to the feedback state of the eNB and the transmission state of the uplink data of the UE 80.
Exemplarily, the obtaining module 802 is configured to receive a NACK message sent by the eNB;
accordingly, the retransmission module 803 is specifically configured to:
correcting the retransmission resource position according to the semi-persistent scheduling SPS period length and the round trip time RTT length of the hybrid automatic retransmission request HARQ to obtain a corrected retransmission resource position; wherein, the corrected retransmission resource position is the first SPS configuration resource position after the HARQ RTT;
and retransmitting uplink data at the corrected retransmission resource position.
Exemplarily, the obtaining module 802 is configured to set a maximum number of retransmissions of HARQ to 1;
and receiving a protocol data unit PDU of a radio link control sublayer RLC state sent by the eNB; the PDU in the RLC state is used to indicate the RLC data that needs to be retransmitted by the retransmission module 803;
accordingly, the retransmission module 803 is specifically configured to transmit the RLC data to be retransmitted on the SPS configuration resource according to the PDU in the RLC state.
Exemplarily, the obtaining module 802 is configured to trigger the retransmitting module 803 when the UE80 does not receive HARQ feedback of the eNB within a fixed time period after the uplink data is sent;
correspondingly, the retransmission module 803 is configured to retransmit the uplink data on the first SPS configuration resource after the fixed time period.
The structure of the UE80 provided in the embodiment of the present invention can consider the sending state of the UE80 when retransmitting uplink data, so that a preset retransmission policy can be set based on the criterion of avoiding uplink resource waste. Therefore, the waste of retransmission resources can be avoided.
EXAMPLE five
Based on the same technical concept of the foregoing embodiments, referring to fig. 9, which shows a structure of an eNB90 provided in an embodiment of the present invention, the eNB may include: a feedback module 901 and a receiving module 902, wherein,
the feedback module 901 is configured to perform retransmission feedback to the UE;
the receiving module 902 is configured to receive uplink data that is retransmitted by the UE according to the feedback state and the sending state of the uplink data of the UE.
Illustratively, the feedback module 901 is specifically configured to: sending a NACK message to the UE;
correspondingly, the receiving module 902 is specifically configured to receive uplink data retransmitted by the UE at the modified retransmission resource location after the UE modifies the retransmission resource location.
Illustratively, the feedback module 901 is specifically configured to: sending a Protocol Data Unit (PDU) of a radio link control sublayer (RLC) state to the UE;
accordingly, the receiving module 902 is specifically configured to receive RLC data that needs to be retransmitted and is sent by the UE on SPS configuration resources according to the PDU in the RLC state.
Illustratively, the feedback module 901 is specifically configured to: not feeding back NACK information, and feeding back ACK information only after data is correctly received;
correspondingly, the receiving module 902 is specifically configured to receive uplink data retransmitted by the UE on the first SPS configuration resource after the fixed time period.
EXAMPLE six
Based on the same technical concept of the foregoing embodiments, referring to fig. 10, a system 100 for uplink data retransmission provided in an embodiment of the present invention is shown, where the system 100 includes a user equipment UE80 and an evolved node eNB 90; wherein the content of the first and second substances,
the UE80 is configured to acquire a feedback state of the eNB90 in a time period of a skipped uplink transmission;
and retransmitting the uplink data according to a preset retransmission strategy according to the feedback state of the eNB90 and the transmission state of the uplink data per se;
the eNB90 is configured to perform retransmission feedback to the UE 80;
and receiving the uplink data retransmitted by the UE80 according to the feedback state and the transmission state of the uplink data of the UE 80.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (17)

1. A method for uplink data retransmission, the method comprising:
user Equipment (UE) acquires a feedback state of an evolved node eNB in a leappable uplink transmission time period;
the UE retransmits the uplink data according to a preset retransmission strategy according to the feedback state of the eNB and the transmission state of the uplink data of the UE; wherein the content of the first and second substances,
the UE acquires the feedback state of the eNB in the time period of the uplink transmission that can be skipped, including:
UE receives NACK information sent by eNB;
alternatively, the first and second electrodes may be,
the UE sets the maximum retransmission times of the HARQ to be 1 and receives a protocol data unit PDU of a radio link control sublayer RLC state sent by the eNB; the PDU in the RLC state is used for indicating RLC data needing to be retransmitted by the UE;
alternatively, the first and second electrodes may be,
the UE does not receive the HARQ feedback of the eNB within a fixed time period after the uplink data is sent.
2. The method according to claim 1, wherein when the UE receives the NACK message sent by the eNB, the UE performs uplink data retransmission according to a preset retransmission policy according to a feedback state of the eNB and a sending state of its own uplink data, specifically including:
the UE corrects the retransmission resource position according to the semi-persistent scheduling SPS period length and the round trip time RTT length of the hybrid automatic retransmission request HARQ to obtain a corrected retransmission resource position; wherein, the corrected retransmission resource position is the first SPS configuration resource position after the HARQ RTT;
and the UE retransmits the uplink data at the corrected retransmission resource position.
3. The method according to claim 1, wherein the UE sets the maximum number of HARQ retransmissions to 1, and receives the PDU in the RLC state sent by the eNB, and performs uplink data retransmission according to a preset retransmission policy according to the feedback state of the eNB and the sending state of its own uplink data, specifically including:
and the UE sends the RLC data needing to be retransmitted on the SPS configuration resources according to the PDU in the RLC state.
4. The method according to claim 1, wherein when the UE does not receive the HARQ feedback from the eNB within a fixed time period after the UE completes transmitting the uplink data, the UE performs uplink data retransmission according to a preset retransmission policy according to the feedback state of the eNB and the transmission state of its own uplink data, specifically including:
and the UE retransmits the uplink data on the first SPS configuration resource after the fixed time period.
5. A method for uplink data retransmission, the method comprising:
in the time period of uplink transmission which can be skipped by User Equipment (UE), an evolved node eNB carries out retransmission feedback to the UE;
the eNB receives uplink data retransmitted by the UE according to the feedback state and the sending state of the uplink data of the UE; wherein the content of the first and second substances,
the eNB performs retransmission feedback to the UE, including:
the eNB sends a NACK message to the UE;
alternatively, the first and second electrodes may be,
the eNB sends a protocol data unit PDU of a radio link control sublayer RLC state to the UE;
alternatively, the first and second electrodes may be,
the eNB does not feed back NACK messages, but feeds back ACK messages only after receiving data correctly.
6. The method according to claim 5, wherein when the eNB sends the NACK message to the UE, the eNB receives uplink data retransmitted by the UE according to the HARQ feedback state and the sending state of the uplink data of the UE, and specifically includes:
and the eNB receives uplink data retransmitted at the corrected retransmission resource position after the retransmission resource position is corrected by the UE.
7. The method according to claim 5, wherein when the eNB sends a protocol data unit PDU in the RLC state to the UE, the eNB receives uplink data retransmitted by the UE according to the feedback state and the sending state of the uplink data of the UE, and specifically includes:
the eNB receives RLC data requiring retransmission sent by the UE on SPS configuration resources in accordance with RLC status PDUs.
8. The method of claim 5, wherein the eNB does not feed back a NACK message, and only when feeding back an ACK message after correctly receiving data, the eNB receives uplink data retransmitted by the UE according to the HARQ feedback state and the transmission state of the uplink data of the UE, specifically includes:
and the eNB receives uplink data retransmitted by the UE on the first SPS configuration resource after the fixed time period.
9. A User Equipment (UE), the UE comprising: the device comprises a timing module, an acquisition module and a retransmission module; wherein the content of the first and second substances,
the timing module is configured to time a time period of uplink transmission that can be skipped by the UE, and trigger the obtaining module during the time period;
the acquiring module is used for acquiring the feedback state of the eNB;
the retransmission module is used for retransmitting the uplink data according to a preset retransmission strategy according to the feedback state of the eNB and the sending state of the uplink data of the UE; wherein the content of the first and second substances,
the acquisition module is specifically configured to:
receiving a NACK message sent by the eNB;
alternatively, the first and second electrodes may be,
setting the maximum retransmission times of HARQ to be 1, and receiving a protocol data unit PDU of a radio link control sublayer RLC state sent by the eNB; the PDU in the RLC state is used for indicating RLC data needing to be retransmitted by the UE;
alternatively, the first and second electrodes may be,
and when the UE does not receive the HARQ feedback of the eNB within a fixed time period after the uplink data is sent, triggering the retransmission module.
10. The UE of claim 9, wherein the retransmission module is specifically configured to:
correcting the retransmission resource position according to the semi-persistent scheduling SPS period length and the round trip time RTT length of the hybrid automatic retransmission request HARQ to obtain a corrected retransmission resource position; wherein, the modified retransmission resource position is the first SPS configuration resource position after the harq rtt;
and retransmitting uplink data at the corrected retransmission resource position.
11. The UE of claim 9, wherein the retransmission module is specifically configured to:
and transmitting the RLC data needing retransmission on the SPS configuration resources according to the PDU of the RLC state.
12. The UE of claim 9, wherein the retransmission module is specifically configured to:
and retransmitting the uplink data on the first SPS configuration resource after the fixed time period.
13. An evolved node, eNB, comprising: a feedback module and a receiving module, wherein,
the feedback module is used for carrying out retransmission feedback on the UE;
the receiving module is used for receiving the uplink data retransmitted by the UE according to the feedback state and the sending state of the uplink data of the UE; wherein the content of the first and second substances,
the feedback module is specifically configured to:
sending a NACK message to the UE;
alternatively, the first and second electrodes may be,
sending a Protocol Data Unit (PDU) of a radio link control sublayer (RLC) state to the UE;
alternatively, the first and second electrodes may be,
no NACK message is fed back, only an ACK message is fed back after the data is correctly received.
14. The eNB of claim 13, wherein the receiving module is specifically configured to receive uplink data retransmitted by the UE at the modified retransmission resource location after the UE modifies the retransmission resource location.
15. The eNB according to claim 13, wherein the receiving module is specifically configured to receive RLC data that is transmitted by the UE on SPS configuration resources in accordance with the PDU in RLC status and that requires retransmission.
16. The eNB according to claim 13, wherein the receiving module is specifically configured to receive uplink data retransmitted by the UE on a first SPS configuration resource after a fixed time period.
17. A storage medium storing a computer program, wherein the computer program when executed by a processor implements the steps of the method of any one of claims 1 to 4; alternatively, the computer program realizes the steps of the method of any one of claims 5 to 8 when executed by a processor.
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