WO2014117543A1

WO2014117543A1 - Transmission method and apparatus based on channel activation detection

Info

Publication number: WO2014117543A1
Application number: PCT/CN2013/085647
Authority: WO
Inventors: 宁涛涛; 谷成金; 杨琼
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-01-29
Filing date: 2013-10-22
Publication date: 2014-08-07
Also published as: CN103973418B; CN103973418A

Abstract

Disclosed in the present invention are a transmission method and apparatus based on channel activation detection, relating to the field of communications. The method comprises: a base station issuing to a terminal scheduling information containing scheduling resource indication, for enabling the terminal to send service data; the base station receiving the service data uploaded by the terminal; the base station verifying the service data; in the event of a verification error, the base station judging whether the scheduling information is lost by using the service data; and the base station performing HAQR (Hybrid Automatic Repeat request) mode decision processing and HARQ retransmission processing by using a judgment result, for controlling the terminal to perform HARQ retransmission according to a processing result. By adopting the transmission method and apparatus disclosed by the invention, Long Term Evolution (LTE) uplink packet error can be reduced, and the resource utilization rate of a physical downlink control channel (PDCCH) can be effectively improved.

Description

Transmission method and equipment based on channel activation detection

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to an uplink hybrid automatic repeat (HARQ) processing technique in a Long Term Evolution (LTE) system. BACKGROUND In an LTE system, in order to improve system performance in a coverage-constrained scenario, HARQ is often used, and HARQ can be specifically classified into Incremental Redundancy (IR) adaptive mode and soft combining (Chase Combining). , referred to as CC) mode and IR non-adaptive mode. For the CC mode, the retransmission data is exactly the same as the previously transmitted packet data. There is only one redundant version, and the receiving end soft-combines the retransmitted data and the stored data for decoding. For the IR mode, the first new data contains all the information. After the Cyclic Redundancy Check (CRC) is incorrect, the error packet is stored in the receiver register. Multiple redundancy versions, each retransmission contains the same information bits and different incremental redundancy versions, the receiving end performs soft bit combining on the retransmitted information bits, and merges the new parity bits into the code words. Decoding is done. For the base station side, in the IR adaptive mode, the retransmitted HARQ reallocates the frequency domain resources. Therefore, the physical downlink control channel PDCCH resource needs to be used to re-instruct the UE to retransmit the frequency domain resources allocated by the HARQ. It is generally considered that the downlink control information DCI0 transmitted by the PDCCH indicates an 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. In this case, the HARQ does not need to use the PDCCH resource, and only the physical hybrid automatic retransmission indication is used. The Physical Hybrid-ARQ Indicator Channel (PHICH) indicates Acknowledgement (abbreviated as ACK) or Negative Acknowledgement (NACK).

LTE uplink retransmission is to solve the uplink transmission error packet. However, 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, the RV is used to indicate the transmitted data. Starting position, if DCI0 with RV=0 is missing, the physical layer cannot solve the packet. In the IR non-adaptive mode, if the DCI0 is lost, the RV version on the base station side and the UE side is inconsistent, and the physical layer cannot decrypt the data packet, which ultimately causes the HARQ transmission failure to cause packet loss. In the IR adaptive mode, the DCI0 indication needs to be sent for both the new transmission and the retransmission, and the IR non-adaptive mode is that only the new transmission needs to issue the DCI0 indication, and the retransmission does not need to issue the DCI0. It can be seen that the IR non-adaptive mode has a greater advantage over the IR adaptive mode in that it saves PDCCH resources. However, HARQ retransmitted in IR adaptive mode redistributes frequency domain resources, while IR is not In the adaptive mode, the frequency domain resources are fixed. If the multiple frequency domain resources are in the case of multiple UEs, the probability of HARQ retransmission failure in the IR non-adaptive mode is large. The problem that the base station needs to solve is how to ensure that the error packet is minimized and how to use the PDCCH resource more rationally. SUMMARY OF THE INVENTION An object of the present invention is to provide a transmission method and apparatus based on channel activation detection, which solves the problem that the UE misses the DCI0 caused by the UE in the prior art, causing the HARQ to fail, thereby causing packet loss. According to an aspect of the present invention, a transmission method based on channel activation detection is provided, including: a base station transmitting scheduling information for causing a terminal to transmit service data to a terminal; and receiving, by the base station, service data uploaded by the terminal; The data is checked; when the check is incorrect, the base station uses the service data to determine whether the terminal has lost the scheduling information; and the base station uses the judgment result to perform hybrid automatic retransmission HARQ mode decision processing and HARQ retransmission processing, so as to control The terminal performs 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 determining, by the base station, whether the terminal has lost the scheduling information comprises: calculating, by the base station, a signal power or a signal to noise ratio of the service data; when the signal power of the service data is less than a signal power threshold or the service data When the signal to noise ratio is smaller than the signal to noise ratio threshold, the base station determines that the service data is not compatible with the scheduling information, and determines that the terminal loses the scheduling information. The step of the HARQ mode decision process includes: when the base station determines that the terminal loses the scheduling information, adjusts the HARQ mode to the IR adaptive mode, and otherwise adjusts the HARQ mode to the IR non-adaptive mode. The step of processing the HARQ retransmission includes: when the base station determines that the terminal loses the scheduling information, keeps the original

RV value, otherwise, update the RV value. The scheduling information includes downlink control information DCIOo indicating that the redundancy version RV value of the scheduling resource is zero. The step of the control terminal performing HARQ retransmission according to the processing result includes: the base station resending the scheduling to the terminal according to the IR adaptive mode. Information, the scheduling information includes downlink control information DCI0 with an RV value of zero; the terminal sends the service data to the base station according to the scheduling information. Preferably, the step of the control terminal performing the HARQ retransmission according to the processing result includes: the base station transmitting the physical hybrid automatic retransmission indication channel PHICH indication information to the terminal; the terminal updating the RV value according to the PHICH indication information, and sending the service data To the base station. According to another aspect of the present invention, a transmission apparatus based on channel activation detection is provided, including the following unit disposed on a base station side: a data transceiving unit configured to deliver scheduling information for causing a terminal to transmit service data to a terminal, And receiving the service data uploaded by the terminal; the data check unit is configured to check the service data; and the activation decision unit is configured to determine, when the check error occurs, whether the terminal loses the schedule by using the service data. The mode decision unit is configured to perform hybrid automatic retransmission HAQR mode decision processing by using the judgment result; and the retransmission processing unit is configured to perform HARQ retransmission processing by using the judgment result, so that the control terminal performs HARQ retransmission according to the processing result. Preferably, the data transceiver unit is further configured to send the physical hybrid automatic repeat indication channel PHICH indication information or resend the scheduling information to the terminal. Compared with the prior art, the present invention has the following advantages: The present invention can not only effectively reduce error packets, but also effectively improve PDCCH resource utilization. 1 is a flowchart of a transmission method based on channel activation detection according to an embodiment of the present invention; FIG. 2 is a structural block diagram of a transmission apparatus based on channel activation detection according to an embodiment of the present invention; FIG. 3 is a diagram of the apparatus shown in FIG. Channel activation detection flow chart; FIG. 4 is a flow chart of the IR adaptive mode and the IR non-adaptive mode decision in FIG. 3; and FIG. 5 is a flow chart of the HARQ retransmission process in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

LTE uplink HARQ is to solve the uplink transmission error packet. The uplink transmission needs to rely on the DCI0 to indicate the scheduling resource to the UE. However, if there is a large interference in the downlink channel, or for some other reason, the UE loses the DCI0 sent by the base station. Eventually, the uplink HARQ will fail, resulting in a packet error. In the present invention, The station side performs DCIO activation detection to determine whether the UE loses DCI0. If DCI0 is lost, the base station side maintains the RV value according to a certain rule. If not lost, update the RV value. The retransmitted HARQ in the IR adaptive mode needs to re-allocate the PDCCH frequency domain resources, and the DCI0 needs to be re-issued. In the IR non-adaptive mode, the PDCCH frequency domain resource is fixed, and only DCI0 needs to be sent when the new transmission is performed. In the case of multiple UEs, limited PDCCH frequency domain resources will lead to a greater probability of HARQ failure in IR non-adaptive mode. Combining the advantages and disadvantages of these two modes, it can be in IR adaptive mode and IR non-adaptive mode. The flexible transformation is performed to reduce the LTE uplink HARQ failure and make the PDCCH resources more rationally utilized. The present invention provides a transmission method that provides channel-based activation detection by making a corresponding selection decision by using the DCI0 activation detection mechanism. 1 is a flowchart of a method for transmitting a channel activation detection according to an embodiment of the present invention. As shown in FIG. 1 , the method includes: Step 101: A base station sends scheduling information for sending, by a terminal, a service data, where the scheduling is performed. The information includes downlink control information DCI0 indicating that the redundancy version RV value of the scheduling resource is zero. Step 102: The base station receives, according to the scheduling information, service data uploaded by the terminal at a predetermined time-frequency resource. Step 103: The base station performs verification on the service data. Step 104: When the error is verified, the base station uses the signal power or the signal to noise ratio of the service data to determine whether the terminal has lost the scheduling information. 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 performs hybrid automatic retransmission HAQR mode decision processing and HARQ retransmission processing by using the judgment result, so that the control terminal performs HARQ retransmission according to the processing result. In the step 105, when the base station determines that the terminal loses the scheduling information, the base station adjusts the HARQ mode to the IR adaptive mode, and maintains the original RV value, and then resends the scheduling information to the terminal, where the scheduling information includes The downlink control information DCI0 having an RV value of zero, so that the terminal transmits the service data to the base station according to the scheduling information. When the base station determines that the terminal does not lose the scheduling information, the base station adjusts the HARQ mode to the IR non-adaptive mode, and updates the RV value, and then sends the 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. The present invention is directed to the scenario of LTE uplink HARQ transmission, and provides a transmission apparatus that provides channel activation detection, which reduces LTE uplink HARQ failure by using the DCI0 activation detection mechanism, and makes the PDCCH resource more rationally utilized. 2 is a structural block diagram of a transmission apparatus based on channel activation detection according to an embodiment of the present invention. As shown in FIG. 2, the following units are disposed on a base station side: The data transceiver unit is configured to send, to the terminal, scheduling information for the terminal to send the service data, and receive the service data uploaded by the terminal at the predetermined time-frequency resource according to the scheduling information, where 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 is configured to verify the received service data. The activation decision unit is configured to determine whether the terminal has lost the scheduling information by using the power or signal to noise ratio of the service data when the data check unit checks the error. Specifically, the base station side detects whether the UE loses the DCI0 on the base station side by calculating a signal-to-noise ratio or a power measurement amount 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 decision unit is configured to perform hybrid automatic retransmission HAQR mode decision processing by using the judgment result. Specifically, based on the DCI0 activation decision of the activation judging unit, the HARQ mode is modified according to a certain rule to perform the delivery or non-delivery of the DCI0, that is, when the activation decision unit determines that the terminal has lost the scheduling information, the mode decision unit will HARQ. The mode is adjusted to the IR adaptive mode, and the DCI0 is sent. Otherwise, the HARQ mode is adjusted to the IR non-adaptive mode, and DCI0 is not issued. The retransmission processing unit is configured to perform HARQ retransmission processing by using the judgment result, 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 a certain rule, that is, when the activation determination unit determines that the terminal has lost the scheduling information, the retransmission processing unit maintains the original RV value, otherwise, the RV value is updated. . The data transceiving unit resends the scheduling information to the terminal when the data check unit is in the wrong state and the activation determining unit determines that the terminal has lost the scheduling information, where the scheduling information includes downlink control information DCI0 with an RV value of zero, so that The terminal transmits the retransmitted service data to the base station according to the scheduling information. When the data check unit checks the error and the activation decision unit determines that the terminal does not lose the scheduling information, the data transceiver unit transmits only the PHICH indication information to the terminal, so that the terminal updates the RV value according to the PHICH indication information, and retransmits The service data is sent to the base station. The implementation principle and operation mechanism of the device are described in detail below with reference to FIG. 3 to FIG. 5. FIG. 3 is a flowchart of channel activation detection in the device shown in FIG. 2. As shown in FIG. 3, the steps include: The DCI0 with the RV value equal to 0 is sent to schedule the new transmission service data of the UE, and the UE sends the 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 at the specified time-frequency resource, performs CRC check on the service data, and determines whether the UE has lost the DCI0. In the third step, according to the judgment result, it is determined whether the uplink transmission mode is an IR adaptive mode or an IR non-adaptive mode. The specific decision process is shown in FIG. 4. If the base station determines whether the UE has lost DCI0, it determines that it is an IR adaptive mode. Otherwise, the decision is an IR non-adaptive mode. In the fourth step, according to the judgment result, the RV version of the HARQ retransmission is selected. The specific HARQ retransmission processing flow is shown in FIG. 5. When the base station determines that the UE has lost DCI0, the RV value takes the last RV value, that is, the RV value remains unchanged, otherwise, the RV value is updated. That is, if the CRC check is incorrect, the base station needs to enable the retransmission mechanism to guarantee the transmission, and select the RV version of the retransmission according to the DCI0 detection result. If the UE loses the DCI0 of the base station and DCI0 is not activated, then the RV version number of the HARQ retransmission is the same as the RV version number of the last transmission (new transmission or retransmission), that is, the RV version number continues to be 0, and the next time Send DCI0, and adjust the uplink transmission mode to adaptive mode. If the UE does not lose DCI0, then the RV version number of the HARQ retransmission is updated to 2, and the uplink transmission mode is adjusted to the non-adaptive mode. Although the invention has been described in detail above, the invention is not limited thereto, and various modifications may be made by those skilled in the art in accordance with the principles of the invention. Therefore, modifications made in accordance with the principles of the invention should be construed as falling within the scope of the invention.

Claims

The claim method, a transmission method based on channel activation detection, includes:

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

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

The base station performs verification on the service data.

When the check is incorrect, the base station uses the service data to determine whether the terminal has lost the scheduling information;

The base station uses the judgment result to perform hybrid automatic retransmission HAQR mode decision processing and HARQ retransmission processing, so that the control terminal performs HARQ retransmission according to the processing result. The method according to claim 1, wherein the base station receives the service data uploaded by the terminal at a predetermined time-frequency resource according to the scheduling information. The method according to claim 2, wherein the step of determining, by the base station, whether the terminal has lost the scheduling information comprises:

The base station calculates a signal power or a 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 determines that the terminal loses the Scheduling information. The method according to claim 3, wherein the step of the HARQ mode decision process comprises: when the base station determines that the terminal loses the scheduling information, adjusting the HARQ mode to the IR adaptive mode, otherwise, adjusting the HARQ mode. Is the IR non-adaptive mode. The method according to claim 4, wherein the HARQ retransmission processing step comprises:

When the base station judges that the terminal loses the scheduling information, the original redundancy version RV value is maintained, otherwise, the RV value is updated. The method according to any one of claims 1-5, wherein the scheduling information comprises downlink control information DCI0 for indicating that the RV value of the scheduling resource is zero. The method according to claim 6, wherein the step of the control terminal performing HARQ retransmission according to the processing result includes:

The base station retransmits the scheduling information to the terminal according to the IR adaptive mode, where the scheduling information includes downlink control information DCI0 with an RV value of zero; the terminal sends the service data to the base station according to the scheduling information. The method according to claim 6, wherein the step of the control terminal performing HARQ retransmission according to the processing result includes:

The base station sends a physical hybrid automatic retransmission indication channel 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. A transmission device based on channel activation detection, comprising the following units disposed on the base station side:

The data transceiver unit is configured to send scheduling information for the terminal to send the service data to the terminal, and receive the service data uploaded by the terminal;

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

Activating the determining unit, configured to determine, by the service data, whether the terminal has lost the scheduling information when the verification error occurs;

The mode decision unit is configured to perform hybrid automatic retransmission HAQR mode decision processing by using the judgment result;

The retransmission processing unit is configured to perform HARQ retransmission processing by using the judgment result, so that the control terminal performs HARQ retransmission according to the processing result. The apparatus according to claim 9, wherein the data transceiving unit is further configured to send a physical hybrid automatic retransmission indication channel PHICH indication information or resend scheduling information to the terminal.