CN102547779B - Method and base station for determining non-detection of down link control information - Google Patents
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Abstract
The embodiment of the invention provides a method and base station for determining non-detection of down link control information. The method comprises that: a receiving terminal sends data through a physical uplink shared channel (PUSCH), and the data is demodulated, so a demodulation result is obtained; and if the signal quality threshold value of the demodulation result is smaller than a preset lowest threshold value, the terminal is determined that the down link control information is not detected. The base station comprises a processing module and a determining module. The scheme provided by the embodiment of the invention can effectively detect the non-detection of DCI0 at UE side, so caused by non-detection are avoided, and the spectral efficiency of the base station is improved.
Description
Technical Field
The present invention relates to communications technologies, and in particular, to a method and a base station for determining missed detection of downlink control information.
Background
Long Term Evolution (LTE) is a broadband wireless technology standard proposed by the 3rd Generation Partnership Project (3 GPP) organization, and is a high data rate, low latency and full packet-based mobile communication system standard. In LTE, Downlink Control Information (DCI) is Control signaling used by a base station (NodeB) to schedule User Equipment (User Equipment, UE), and DCI0 (DCI numbered 0) indicates Control signaling used by the NodeB to schedule the UE to perform uplink data transmission. When the NodeB receives a resource scheduling request of the UE or the UE has redundant data that is not sent, the NodeB instructs the UE to perform data transmission on a Physical Uplink Shared Channel (PUSCH) through DCI 0. After the indication of the DCI0 is detected blindly, the UE transmits PUSCH data to the NodeB according to the timing sequence specified by the LTE protocol. When the demodulation result is an error, the NodeB demodulates the PUSCH, and when the demodulation result is an error, the NodeB feeds back Negative Acknowledgement (NACK) information to the UE through a Physical downlink shared Channel (PHICH), and the UE retransmits the corresponding data.
When the UE has DCI0 false detection, especially missed detection, the NodeB indicates the UE to upload data, and the UE does not upload data according to the requirement of the NodeB (the uploaded data may be considered as null data), or uploads erroneous data, so that the NodeB cannot receive correct PUSCH data, then the result of checking the demodulation result of the received erroneous or null PUSCH data by the NodeB is necessarily NACK, so that the NodeB feeds back NACK information to the UE through a HARQ mechanism in a downlink manner, and the HARQ does not include DCI0, so that the UE still cannot upload data according to the requirement of the NodeB. The result of HARQ retransmission is still that the check result is NACK, so HARQ retransmission will be performed until the maximum number of HARQ retransmissions is reached. Then, during the HARQ retransmission period, precious uplink and downlink frequency resources are occupied, which causes resource waste.
Disclosure of Invention
The embodiment of the invention provides a method for determining missed detection of downlink control information and a base station.
In one aspect, an embodiment of the present invention provides a method for determining missing downlink control information, including:
receiving data sent by a terminal through a Physical Uplink Shared Channel (PUSCH), and demodulating the data to obtain a demodulation result;
and if the signal quality threshold value of the demodulation result is smaller than a preset minimum threshold value, determining that the terminal has downlink control information missing detection.
In another aspect, an embodiment of the present invention further provides a base station, including:
the processing module is used for receiving data sent by a terminal through a Physical Uplink Shared Channel (PUSCH), and demodulating the data to obtain a demodulation result;
and the determining module is used for determining that the downlink control information missing detection occurs in the terminal when the signal quality threshold value of the demodulation result is smaller than a preset minimum threshold value.
According to the method for determining the missed detection of the downlink control information and the base station, when the signal quality threshold value of the demodulation result of the PUSCH data is smaller than the preset minimum threshold value, the UE side is determined to have the missed detection of the DCI0, HARQ retransmission caused by the missed detection is avoided, further waste of uplink and downlink frequency resources is avoided, and the spectrum utilization rate of the base station is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for determining missed detection of downlink control information according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for determining missed detection of downlink control information according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a first base station according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a second base station according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a third base station according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a fourth base station according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a fifth base station according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a flowchart of a method for determining missed detection of downlink control information according to an embodiment of the present invention, as shown in fig. 1, the method includes:
step 101: the base station receives data sent by a terminal through a PUSCH (physical uplink shared channel), and demodulates the data to obtain a demodulation result;
wherein the demodulation result comprises: the Signal quality related parameters of the PUSCH corresponding to the terminal include, for example, Signal to Interference plus Noise Ratio (SINR), Reference Signal Received Power (RSRP), and the like.
After the base station obtains the demodulation result, the demodulation result can be further stored.
Step 102: if the signal quality threshold of the demodulation result is smaller than the preset minimum threshold, the base station can determine that the downlink control information is missed to be detected by the terminal.
The signal quality threshold value of the demodulation result is used for representing the quality of the signal received by the current PUSCH call, and whether the UE uploads data on the PUSCH can be effectively detected.
The preset minimum threshold may be an empirical value, or may be a minimum threshold for detecting the DCI0 by the UE side, which is obtained through the dispute of a technician. The embodiment of the present invention preferably uses the signal quality related parameters of the PUSCH in idle load, such as the SINR value, the RSRP vertical value, or the integrated value of the SINR and the RSPR as the minimum threshold value. The integrated value of SINR and RSRP may be a parameter obtained by weighting the SINR and RSRP values and then adding the weighted values, and the weighted values of SINR and RSRP may be set according to actual situations.
Once it is determined that the terminal has DCI0 missing detection, the retransmission on the HARQ channel of this time is stopped, so as to effectively reduce the occupation of the uplink and downlink physical shared channels.
According to the method for determining the missed detection of the downlink control information, the UE side is determined to have the missed detection of the DCI0 when the signal quality threshold value of the demodulation result of the PUSCH data is smaller than the preset minimum threshold value, HARQ retransmission caused by the missed detection is avoided, further waste of uplink and downlink frequency resources is avoided, and the spectrum utilization rate of the base station is improved.
Fig. 2 is a flowchart of a method for determining missed detection of downlink control information according to an embodiment of the present invention, and as shown in fig. 2, the method includes:
step 201: the base station receives data sent by the terminal through a PUSCH, demodulates the data to obtain a demodulation result, and stores the demodulation result (such as SINR or RSRP);
step 202: obtaining a PUSCH signal quality threshold value CurThrd according to a demodulation result;
wherein, CurThrd may be a measured value of SINR, may also be a measured value of RSRP, and may also be a combination of measured values of SINR and RSRP, for example, CurThrd ═ SINR + RSRP; where P is the set coefficient factor. Of course, CurThrd can be any signal quality related parameter, or combination of parameters. Here, the following description will be omitted, taking CurThrd ═ P × SINR + RSRP as an example.
Step 203: judging whether the PUSCH calling is initial transmission scheduling or not;
if yes, go to step 204;
if not, step 206 is performed.
Step 204: judging whether the signal quality threshold value CurThrd is smaller than the lowest threshold value Thrd and smaller than a historical threshold value HisThrd;
if so, go to step 205;
if not, step 206 is performed.
Step 205: and determining that the PUSCH scheduling is caused by missed detection, stopping retransmission on the HARQ channel, and ending.
Step 206: and executing the retransmission on the HARQ channel.
It should be noted that, in the above steps, the following optional steps may also be included: and verifying the demodulation result stored in the step 201 to obtain a verification result, wherein the verification result is used for judging whether the determination result of the missed detection of the terminal is correct or not. The Check performed on the demodulation result may be a Cyclic Redundancy Check (CRC).
When the check result is NACK, the determination result that the terminal has missed detection is correct;
and when the check result is ACK, the determination result of the missed detection of the terminal is wrong, and the judgment needs to be carried out again.
Further, if the checking result is ACK, the signal quality threshold value CurThrd calculated in step 202 may be updated to a preset historical threshold value HisThrd for subsequent use.
The method for determining the missed detection of the downlink control information of the embodiment of the invention determines the missed detection of the DCI0 on the UE side when the signal quality threshold value of the demodulation result of the PUSCH data is smaller than the preset minimum threshold value and the history threshold value at the same time, thereby effectively detecting the missed detection of the DCI0 on the UE side, avoiding the waste of uplink frequency resources caused by the missed detection and improving the spectrum utilization rate of the base station. Moreover, the demodulation result can be verified, and the determination result of the missed detection of the DCI0 is judged by using the result obtained by verification, so that the accuracy of the missed detection determination of the DCI0 is effectively ensured.
Fig. 3 is a schematic structural diagram of a first base station according to an embodiment of the present invention, the base station being a specific main body for performing the method, and as shown in fig. 3, the base station includes: a processing module 301 and a determining module 302.
Specifically, the processing module 301 is configured to receive data sent by the terminal through the PUSCH, and demodulate the data to obtain a demodulation result;
the determining module 302 is configured to determine that the terminal has missed the detection of the downlink control information DCI0 if the signal quality threshold of the demodulation result is smaller than a preset minimum threshold.
Fig. 4 is a schematic structural diagram of a second base station according to an embodiment of the present invention, as shown in fig. 4, on the basis of the implementation shown in fig. 3, the base station may further include: module 303 is executed. The executing module 303 is configured to stop the retransmission on the HARQ channel this time when the determining module 302 determines that the terminal has missed the detection of the downlink control information DCI 0.
Fig. 5 is a schematic structural diagram of a third base station according to an embodiment of the present invention, as shown in fig. 5, on the basis of the implementation shown in fig. 4, the base station may further include: and the checking module 304 is configured to check the demodulation result, and determine whether the determination result is correct according to the check result. Specifically, the verification module 304 may include: the first unit and/or the second unit. The first unit is used for determining that the determination result about the terminal missing detection is correct when the check result is NACK; and the second unit is used for determining that the determination result about the terminal missing detection is wrong when the verification result is ACK.
Further, the determining module 302 may be further configured to: judging whether the signal quality threshold value of the demodulation result is smaller than a pre-stored historical threshold value; and when the signal quality threshold value is smaller than the lowest threshold value and the signal quality threshold value is smaller than the historical threshold value, determining that the downlink control information DCI0 of the terminal is missed.
Fig. 6 is a schematic structural diagram of a fourth base station according to an embodiment of the present invention, as shown in fig. 6, on the basis of the implementation shown in fig. 3, the base station may further include: a determining module 305, the determining module 305 being configured to: judging whether the current PUSCH scheduling is initial transmission scheduling; if yes, the determining module 302 determines whether the signal quality threshold of the demodulation result is smaller than a preset minimum threshold.
Fig. 7 is a schematic structural diagram of a fifth base station according to an embodiment of the present invention, as shown in fig. 7, on the basis of the implementation shown in fig. 4, the base station may further include: a determining module 305, the determining module 305 being configured to: judging whether the current PUSCH scheduling is initial transmission scheduling; if not, the executing module 303 allows the base station to execute retransmission on the HARQ channel. Further, if the determining module 305 determines that the current PUSCH scheduling is the initial transmission scheduling, the determining module 302 determines whether the signal quality threshold of the demodulation result is smaller than a preset minimum threshold.
According to the base station provided by the embodiment of the invention, when the signal quality threshold value of the demodulation result of the PUSCH data is smaller than the preset minimum threshold value, the downlink control information DCI0 missing detection on the UE side is determined, so that the problem of the UE side DCI0 missing detection is effectively detected, HARQ retransmission caused by the missing detection is avoided, further waste of uplink and downlink frequency resources is brought, and the spectrum utilization rate of the base station is improved.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on at least two network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (15)
1. A method for determining missed detection of downlink control information, comprising:
receiving data sent by a terminal through a Physical Uplink Shared Channel (PUSCH), and demodulating the data to obtain a demodulation result;
if the signal quality threshold value of the demodulation result is smaller than a preset minimum threshold value, determining that the terminal has downlink control information missing detection;
wherein the signal quality threshold value is: a value of a signal to noise ratio, SINR, of the data and/or a value of a reference signal received energy, RSRP, of the data;
before the determining that the terminal has downlink control information missing, the method further includes:
comparing the signal quality threshold value of the demodulation result with a pre-stored historical threshold value;
and if the signal quality threshold value of the demodulation result is smaller than the pre-stored historical threshold value, determining that the terminal has downlink control information missing detection.
2. The method of claim 1, wherein after determining that the terminal has failed the downlink control information omission, the method further comprises:
and stopping the retransmission on the HARQ channel of the mixed field retransmission request.
3. The method for determining missed downlink control information according to claim 1 or 2, wherein after determining that the missed downlink control information occurs in the terminal, the method further comprises:
verifying the demodulation result to obtain a verification result;
and judging whether the determination result of the missed detection of the terminal is correct or not according to the verification result.
4. The method for determining missed detection of downlink control information according to claim 3, wherein the determining whether the determination result of missed detection of the terminal is correct according to the checking result comprises:
when the check result is Negative Acknowledgement (NACK), the determination result that the missed detection occurs in the terminal is correct; or,
and when the verification result is positive Acknowledgement (ACK), the determination result of missed detection of the terminal is wrong.
5. The method for determining missed detection of downlink control information according to claim 1 or 2, wherein after obtaining the demodulation result, the method further comprises:
judging whether the current PUSCH scheduling is initial transmission scheduling;
if yes, judging whether the signal quality threshold value of the demodulation result is smaller than a preset minimum threshold value.
6. The method of claim 5, further comprising:
and if the current PUSCH scheduling is not the initial transmission scheduling, executing the retransmission on the HARQ channel of the hybrid automatic repeat request.
7. The method of claim 1 or 2, wherein the minimum threshold is: and the signal quality threshold value when the PUSCH is idle.
8. The method of claim 1, wherein the downlink control information is DCI 0.
9. A base station, comprising:
the processing module is used for receiving data sent by a terminal through a Physical Uplink Shared Channel (PUSCH), and demodulating the data to obtain a demodulation result;
a determining module, configured to determine that downlink control information missing detection occurs in the terminal when a signal quality threshold of the demodulation result is smaller than a preset minimum threshold;
the signal quality threshold value is: a value of a signal to noise ratio, SINR, of the data and/or a value of a reference signal received energy, RSRP, of the data;
the determination module is further to: judging whether the signal quality threshold value of the demodulation result is smaller than a pre-stored historical threshold value; and when the signal quality threshold value is smaller than the lowest threshold value and the signal quality threshold value is smaller than the historical threshold value, determining that the terminal has downlink control information missing detection.
10. The base station of claim 9, further comprising:
and the execution module is used for stopping retransmission on the HARQ channel when the determination module determines that the terminal has the missed detection of the downlink control information.
11. The base station according to claim 9 or 10, further comprising:
and the checking module is used for checking the demodulation result and judging whether the determination result is correct or not according to the checking result.
12. The base station of claim 11, wherein the verification module comprises:
a first unit, configured to determine that a determination result of missed detection of the terminal is correct when the check result is negative acknowledgement NACK; or,
and the second unit is used for determining that the determination result of missed detection of the terminal is wrong when the verification result is positive Acknowledgement (ACK).
13. The base station of claim 9, wherein the base station further comprises:
the judging module is used for judging whether the current PUSCH scheduling is initial transmission scheduling;
if yes, the determining module judges whether the signal quality threshold value of the demodulation result is smaller than a preset minimum threshold value.
14. The base station of claim 10, wherein the base station further comprises:
the judging module is used for judging whether the current PUSCH scheduling is initial transmission scheduling;
if not, the execution module executes the retransmission on the HARQ channel of the hybrid automatic repeat request.
15. The base station of claim 9, wherein the downlink control information is DCI 0.
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| CN102868506A (en) * | 2012-09-12 | 2013-01-09 | 大唐移动通信设备有限公司 | Terminal scheduling method and device |
| RU2570813C1 (en) * | 2012-10-25 | 2015-12-10 | Хуавэй Текнолоджиз Ко., Лтд. | Method and device for recovery during loss of control channel detection |
| CN105634678B (en) * | 2012-10-25 | 2019-04-05 | 华为技术有限公司 | A kind of restorative procedure and device of leak-detection control channel |
| CN103825686A (en) * | 2012-11-16 | 2014-05-28 | 联芯科技有限公司 | Device and method for configuring LTE terminal uplink retransmission scheduling |
| EP2933942B1 (en) | 2012-12-17 | 2019-02-06 | LG Electronics Inc. | Method of receiving downlink signal, user device, method of transmitting downlink signal, and base station |
| CN104640131A (en) * | 2013-11-06 | 2015-05-20 | 北京三星通信技术研究有限公司 | Information processing method and UE |
| US10903943B2 (en) | 2014-06-13 | 2021-01-26 | Apple Inc. | Enhanced LTE UL HARQ feedback indication for power saving and range improvement |
| CN105634668B (en) * | 2015-10-22 | 2019-01-01 | 合肥东芯通信股份有限公司 | A kind of empty inspection screening method and device of DCI0 signal |
| CN107465490A (en) * | 2016-06-06 | 2017-12-12 | 大唐移动通信设备有限公司 | A kind of Downlink Control Information DCI0 processing method and system |
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