CN103973418B - A kind of transmission method and device based on Channel Activation detection - Google Patents

Abstract

The present invention discloses a transmission method and device based on channel activation detection, and relates to the field of communication. The method includes: a base station issues scheduling information including scheduling resource indications to enable the terminal to send service data to the terminal; the base station receives the terminal to upload the service data; the base station checks the service data; when the check is wrong, the base station uses the service data to judge whether the terminal has lost the scheduling information; the base station uses the judgment result to perform hybrid automatic retransmission HAQR mode judgment Processing and HARQ retransmission processing, so that the control terminal performs HARQ retransmission according to the processing result. The present invention can reduce long-term evolution LTE uplink error packets, and effectively improve the resource utilization rate of the physical downlink control channel PDCCH.

Description

A transmission method and device based on channel activation detection

technical field

The invention relates to the communication field, in particular to an uplink hybrid automatic retransmission HARQ processing technology in a long-term evolution LTE system.

Background technique

In the LTE system, in order to improve the system performance in the coverage-limited scenario, HARQ is often used, and HARQ can be specifically divided into incremental redundancy (Incremental Redundancy, IR) adaptive mode and soft combination (ChaseCombining, CC) mode and IR non-adaptive mode.

For the CC mode, the feature is that the retransmitted data is exactly the same as the previously sent packet data, and there is only one redundant version. The receiving end performs soft combination of the retransmitted data and the stored data before decoding.

For the IR mode, the first newly transmitted data contains all the information. After the cyclic redundancy check (Cyclic Redundancy Check, CRC) of the receiving end is wrong, the error packet is stored in the register of the receiving end. This scheme has multiple redundant Each retransmission contains the same information bits and different incremental redundancy versions. The receiving end performs soft bit combination on the retransmitted information bits, and combines the new parity bits into the codeword before decoding. code. For the base station side, in the IR adaptive mode, the retransmission HARQ re-allocates frequency domain resources. Therefore, it is necessary to use the physical downlink control channel PDCCH resource to re-instruct the UE to retransmit the frequency domain resources allocated by HARQ. It is generally considered that the downlink control information DCI0 sent by the PDCCH indicates adaptive HARQ. In the IR non-adaptive mode, the frequency domain resource used by the retransmitted HARQ is the same as the frequency domain resource used by the HARQ last transmission. At this time, the HARQ does not need to use the PDCCH resource, and is only indicated by the physical hybrid automatic retransmission The channel (Physical Hybrid-ARQ Indicator Channel, PHICH) indicates acknowledgment (Acknowledgment, ACK) or non-acknowledgment (Negative Acknowledgment, NACK).

LTE uplink retransmission is to solve the uplink transmission error packet, but if the UE loses the DCI0 authorization issued by the eNB, the retransmission may not be able to solve the error packet. In the IR adaptive mode, RV is used to indicate the transmitted data At the starting position, if DCI0 with RV=0 is missing, the physical layer cannot decode the data packet. In the IR non-adaptive mode, if DCI0 is lost, the RV versions on the base station side and the UE side are inconsistent, and the physical layer cannot decode the data packets, which eventually causes HARQ transmission failure and packet loss. In IR adaptive mode, DCI0 indication needs to be issued for both new transmission and retransmission, while in IR non-adaptive mode, only new transmission needs to issue DCI0 indication, and retransmission does not need to issue DCI0 indication. It can be seen from this that the IR non-adaptive mode has a great advantage over the IR adaptive mode, that is, it saves PDCCH resources. However, HARQ retransmission in IR adaptive mode re-allocates frequency domain resources, while in IR non-adaptive mode the frequency domain resources are fixed. In the case of multiple UEs, limited frequency domain resources will lead to The probability of HARQ retransmission failure is relatively high.

The problem that the base station needs to solve is how to ensure that packet errors are minimized and how to use PDCCH resources more reasonably.

Contents of the invention

The purpose of the present invention is to provide a transmission method and device based on channel activation detection, so as to solve the problem in the prior art that UE fails to detect DCI0, which leads to HARQ failure, and then causes packet loss.

According to one aspect of the present invention, a transmission method based on channel activation detection is provided, including:

The base station sends scheduling information to the terminal to enable the terminal to send service data;

The base station receives the service data uploaded by the terminal;

The base station verifies the service data;

When the verification is wrong, the base station uses the service data to judge whether the terminal has lost the scheduling information;

The base station uses the judgment result to perform HARQ mode judgment processing and HARQ retransmission processing, so as to control the terminal to perform HARQ retransmission according to the processing result.

Preferably, the base station receives the service data uploaded by the terminal at a predetermined time-frequency resource according to the scheduling information.

Preferably, the step of the base station judging whether the terminal has lost the scheduling information includes:

The base station calculates the signal power or signal-to-noise ratio of the service data;

When the signal power of the service data is less than the signal power threshold or the signal-to-noise ratio of the service data is less than the signal-to-noise ratio threshold, the base station determines that the service data is not compatible with the scheduling information, and judges that the terminal has lost the Scheduling information.

The steps of the HARQ mode decision processing include:

When the base station judges that the terminal has lost the scheduling information, it adjusts the HARQ mode to an IR adaptive mode, otherwise, adjusts the HARQ mode to an IR non-adaptive mode.

The HARQ retransmission processing steps include:

When the base station judges that the terminal has lost the scheduling information, the original RV value is maintained; otherwise, the RV value is updated.

The scheduling information includes downlink control information DCI0 for indicating that the redundancy version RV value of the scheduling resource is zero.

The steps for the control terminal to perform HARQ retransmission according to the processing result include:

The base station resends scheduling information to the terminal according to the IR adaptive mode, and the scheduling information includes downlink control information DCI0 with an RV value of zero;

The terminal sends service data to the base station according to the scheduling information.

Preferably, the step of controlling the terminal to perform HARQ retransmission according to the processing result includes:

The base station sends PHICH indication information to the terminal;

The terminal updates the RV value according to the PHICH indication information, and sends the service data to the base station.

According to another aspect of the present invention, a transmission device based on channel activation detection is provided, including the following units arranged on the base station side:

A data transceiving unit, configured to send scheduling information to the terminal to enable the terminal to send service data, and receive service data uploaded by the terminal;

a data verification unit, configured to verify the business data;

activating a judging unit, configured to use the service data to judge whether the terminal has lost the scheduling information when the verification is wrong;

The mode judgment unit is used to use the judgment result to perform hybrid automatic retransmission HAQR mode judgment processing;

The retransmission processing unit is configured to use the judgment result to perform HARQ retransmission processing, so that the control terminal performs HARQ retransmission according to the processing result.

Preferably, the data transceiving unit is further configured to send PHICH indication information or resend scheduling information to the terminal.

Compared with the prior art, the beneficial effects of the present invention are:

The present invention can not only effectively reduce packet errors, but also effectively improve the utilization rate of PDCCH resources.

Description of drawings

FIG. 1 is a flowchart of a transmission method based on channel activation detection provided by an embodiment of the present invention;

FIG. 2 is a structural block diagram of a transmission device based on channel activation detection provided by an embodiment of the present invention;

Fig. 3 is a flow chart of channel activation detection in the device described in Fig. 2;

Fig. 4 is IR adaptive mode and IR non-adaptive mode judgment flowchart among Fig. 3;

FIG. 5 is a flowchart of HARQ retransmission processing in FIG. 3 .

Detailed ways

The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described below are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

LTE uplink HARQ is to solve uplink transmission error packets. Uplink transmission needs to rely on DCI0 to indicate scheduling resources to UE, but if there is large interference in the downlink channel, or for some other reasons, UE loses DCI0 sent by the base station, so It will eventually lead to the failure of the uplink HARQ, resulting in packet errors. In the present invention, DCI0 activation detection is performed on the base station side to determine whether the UE loses DCI0, and if DCI0 is lost, the base station side maintains the RV value according to certain rules. If not missing, update the RV value. For HARQ retransmission in IR adaptive mode, PDCCH frequency domain resources need to be re-allocated, and DCI0 needs to be re-delivered. However, in the IR non-adaptive mode, the PDCCH frequency domain resources are fixed, and DCI0 only needs to be issued when new transmission is made. In the case of multiple UEs, the limited PDCCH frequency domain resources will lead to a higher probability of HARQ failure in the IR non-adaptive mode. Combining the advantages and disadvantages of these two modes, it can be used in the IR adaptive mode and the IR non-adaptive mode. Downlink flexible conversion not only reduces LTE uplink HARQ failure, but also makes more reasonable use of PDCCH resources.

The present invention provides a transmission method based on channel activation detection, and makes corresponding selection judgment by using the DCI0 activation detection mechanism. Fig. 1 is a flow chart of a transmission method based on channel activation detection provided by an embodiment of the present invention. As shown in Fig. 1, the steps include:

Step 101 , the base station sends scheduling information to the terminal to enable the terminal to send service data, and the scheduling information includes downlink control information DCI0 indicating that the redundancy version RV value of scheduling resources is zero.

Step 102, the base station receives the service data uploaded by the terminal in a predetermined time-frequency resource according to the scheduling information.

Step 103, the base station checks the service data.

Step 104, when the verification is wrong, the base station judges whether the terminal has lost the scheduling information by using the signal power or signal-to-noise ratio of the service data. When the signal power of the service data is less than the signal power threshold or the signal-to-noise ratio of the service data is less than the signal-to-noise ratio threshold, the base station determines that the terminal has lost the scheduling information.

Step 105, the base station uses the judgment result to perform hybrid automatic repeat transmission HAQR mode judgment processing and HARQ retransmission processing, so as to control the terminal to perform HARQ retransmission according to the processing result.

In the step 105, when the base station judges that the terminal has lost the scheduling information, the base station adjusts the HARQ mode to the IR adaptive mode, and keeps the original RV value, and then resends the scheduling information to the terminal, and the scheduling information includes Downlink control information DCI0 with an RV value of zero, so that the terminal sends service data to the base station according to the scheduling information. When the base station judges that the terminal has not lost the scheduling information, the base station adjusts the HARQ mode to the IR non-adaptive mode, and updates the RV value, and then sends PHICH indication information to the terminal, so that the terminal updates the RV value according to the PHICH indication information , and send the service data to the base station.

For the scene of LTE uplink HARQ transmission, the present invention also provides a transmission device based on channel activation detection, which reduces the failure of LTE uplink HARQ by using the DCI0 activation detection mechanism, and at the same time enables more reasonable utilization of PDCCH resources. Fig. 2 is a structural block diagram of a transmission device based on channel activation detection provided by an embodiment of the present invention. As shown in Fig. 2, it includes the following units arranged on the base station side:

The data transceiving unit is configured to send scheduling information for the terminal to send service data to the terminal, and receive the service data uploaded by the terminal at a predetermined time-frequency resource according to the scheduling information, wherein the scheduling information includes Downlink control information DCI0 indicating that the redundancy version RV value of the scheduling resource is zero.

A data verification unit, configured to verify the received service data.

The activating judging unit is used for judging whether the terminal has lost the scheduling information by using the power or signal-to-noise ratio of the service data when the data checking unit verifies an error. Specifically, the base station detects whether the UE has lost the DCI0 of the base station by calculating the signal-to-noise ratio or power measurement of the service data uploaded by the terminal. That is, when the signal power of the service data is less than the signal power threshold or the signal-to-noise ratio of the service data is less than the signal-to-noise ratio threshold, the base station determines that the terminal has lost the scheduling information.

The mode judging unit is configured to use the judging result to perform hybrid automatic retransmission HAQR mode judging processing. Specifically, based on the DCI0 activation decision of the activation judgment unit, the HARQ mode is modified according to certain rules to perform DCI0 delivery or not, that is, when the activation decision unit judges that the terminal has lost the scheduling information, the mode decision unit will HARQ The mode is adjusted to IR adaptive mode, and DCI0 is issued; otherwise, the HARQ mode is adjusted to IR non-adaptive mode, and DCI0 is not issued.

The retransmission processing unit is configured to use the judgment result to perform HARQ retransmission processing, so that the control terminal performs HARQ retransmission according to the processing result. Specifically, based on the DCI0 activation decision of the activation decision unit, the RV value is modified according to certain rules, that is, when the activation decision unit judges that the terminal has lost the scheduling information, the retransmission processing unit keeps the original RV value; otherwise, the RV value is updated .

Wherein, when the data verification unit verifies an error and the activation judgment unit judges that the terminal has lost the scheduling information, the data transceiver unit resends the scheduling information to the terminal, and the scheduling information includes downlink control information DCI0 with an RV value of zero, so that The terminal sends the retransmitted service data to the base station according to the scheduling information. When the data verification unit verifies an error and the activation judgment unit judges that the terminal has not lost the scheduling information, the data transceiver unit only sends PHICH indication information to the terminal, so that the terminal can update the RV value according to the PHICH indication information, and retransmit The business data is sent to the base station.

Below in conjunction with accompanying drawing 3 to Fig. 5 describe in detail the realization principle and operation mechanism of this device:

Fig. 3 is a flow chart of channel activation detection in the device described in Fig. 2, as shown in Fig. 3, the steps include:

In the first step, the base station sends DCI0 with an RV value equal to 0 to schedule the new service data of the UE, and the UE sends service data according to the DCI0 of the base station.

In the second step, the base station detects the service data sent by the UE in the designated time-frequency resource, performs CRC check on the service data, and judges whether the UE has lost DCI0.

In the third step, according to the judgment result, it is judged whether the uplink transmission mode is the IR adaptive mode or the IR non-adaptive mode. The specific decision process is shown in Figure 4. If the base station judges whether the UE has lost DCI0, it decides to be in the IR adaptive mode; otherwise, it decides to be in the IR non-adaptive mode.

The fourth step is to select the RV version of the HARQ retransmission according to the judgment result. The specific HARQ retransmission processing flow is shown in Figure 5. If the base station judges that the UE has lost DCI0, the RV value is the last RV value, that is, the RV value remains unchanged; otherwise, the RV value is updated.

That is to say, if the CRC check is wrong, the base station needs to enable the retransmission mechanism to ensure the transmission, and select the RV version for retransmission according to the DCI0 detection result. If the UE loses the DCI0 of the base station and DCI0 is not activated, the RV version number of the HARQ retransmission at this time is consistent with the RV version number of the last transmission (new transmission or retransmission), that is, the RV version number continues to be 0, and the RV version number is re-downloaded. Send DCI0, and adjust the uplink transmission mode to adaptive mode. If the UE does not lose DCI0, the RV version number of the HARQ retransmission is updated to 2 at this time, and the uplink transmission mode is adjusted to the non-adaptive mode.

Although the present invention has been described in detail above, the present invention is not limited thereto, and various modifications can be made by those skilled in the art based on the principle of the present invention. Therefore, any modifications made according to the principles of the present invention should be understood as falling within the protection scope of the present invention.

Claims (8)

1. A transmission method based on channel activation detection, characterized in that, comprising: The base station sends scheduling information to the terminal to enable the terminal to send service data; The base station receives the service data uploaded by the terminal; The base station verifies the service data; When the verification is wrong, the base station uses the service data to judge whether the terminal has lost the scheduling information; The base station uses the judging result of whether the terminal has lost the scheduling information to perform hybrid automatic retransmission HARQ mode judgment processing and HARQ retransmission processing, so as to control the terminal to perform HARQ retransmission according to the processing results; The HARQ mode decision processing includes: when the base station judges that the terminal has lost the scheduling information, adjust the HARQ mode to an IR adaptive mode, otherwise, adjust the HARQ mode to an IR non-adaptive mode; The HARQ retransmission processing includes: when the base station judges that the terminal has lost the scheduling information, keep the original redundancy version RV value, otherwise, update the RV value; Wherein, the IR is incremental redundancy. 2. The method according to claim 1, wherein the base station receives the service data uploaded by the terminal in a predetermined time-frequency resource according to the scheduling information. 3. The method according to claim 2, wherein the step of the base station judging whether the terminal has lost the scheduling information comprises: The base station calculates the signal power or signal-to-noise ratio of the service data; When the signal power of the service data is less than the signal power threshold or the signal-to-noise ratio of the service data is less than the signal-to-noise ratio threshold, the base station determines that the service data is not compatible with the scheduling information, and judges that the terminal has lost the Scheduling information. 4. The method according to any one of claims 1-3, wherein the scheduling information includes downlink control information DCI0 for indicating that the RV value of the scheduling resource is zero. 5. The method according to claim 4, wherein the step of performing HARQ retransmission according to the processing result of the control terminal comprises: The base station resends scheduling information to the terminal according to the IR adaptive mode, and the scheduling information includes downlink control information DCI0 with an RV value of zero; The terminal sends service data to the base station according to the scheduling information. 6. The method according to claim 4, wherein the step of performing HARQ retransmission according to the processing result of the control terminal comprises: The base station sends PHICH indication information to the terminal; The terminal updates the RV value according to the PHICH indication information, and sends the service data to the base station. 7. A transmission device based on channel activation detection, characterized in that it comprises the following units arranged on the base station side: A data transceiving unit, configured to send scheduling information to the terminal to enable the terminal to send service data, and receive service data uploaded by the terminal; A data verification unit, configured to verify the service data; an activation judgment unit, configured to use the service data to determine whether the terminal has lost the scheduling information when the verification is wrong; A mode judgment unit, configured to use the judgment result of whether the terminal has lost the scheduling information to perform HARQ mode judgment processing; The retransmission processing unit is configured to perform HARQ retransmission processing by using the judgment result of whether the terminal has lost the scheduling information, so as to control the terminal to perform HARQ retransmission according to the processing result; The HARQ mode decision processing includes: when the base station judges that the terminal has lost the scheduling information, adjust the HARQ mode to an IR adaptive mode, otherwise, adjust the HARQ mode to an IR non-adaptive mode; The HARQ retransmission processing includes: when the base station judges that the terminal has lost the scheduling information, keep the original redundancy version RV value, otherwise, update the RV value; Wherein, the IR is incremental redundancy. 8 . The device according to claim 7 , wherein the data transceiving unit is further configured to send physical hybrid automatic repeat indicator channel (PHICH) indication information or resend scheduling information to the terminal.