CN106817771B - Method and device for processing PDCCH (physical Downlink control channel) missing detection - Google Patents
Method and device for processing PDCCH (physical Downlink control channel) missing detection Download PDFInfo
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- CN106817771B CN106817771B CN201510850330.4A CN201510850330A CN106817771B CN 106817771 B CN106817771 B CN 106817771B CN 201510850330 A CN201510850330 A CN 201510850330A CN 106817771 B CN106817771 B CN 106817771B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
Abstract
The invention relates to the field of communication, in particular to a method and a device for processing PDCCH missed detection, which are used for ensuring the data demodulation performance of data in a control region under the condition that interference exists in the control region. The method comprises the following steps: the base station receives the PDCCH missed detection times reported by the user terminal according to a set period, and reschedules the PDCCH resources for the user terminal based on the PDSCH resources correctly scheduled last time when the PDCCH missed detection times received in the continuous N periods are determined to be larger than a set missed detection time threshold; therefore, the transmission reliability of the PDCCH is improved, and because the DCI is transmitted by bearing on the PDCCH, the receiving accuracy of the DCI of the user terminal is improved, the service experience of the user terminal and the overall average throughput of the system are improved, and the system performance is greatly improved.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for processing PDCCH missed detection.
Background
Currently, in a time division synchronous code division multiple access-long term evolution (TD-LTE) system, a Physical Downlink Control Channel (PDCCH) in a Control region is used to carry Downlink Control Information (DCI), and the DCI carries scheduling Information and uplink power Control Information for Downlink and uplink data transmission. When using data service, the user terminal receives and demodulates physical downlink Shared Channel (PDCCH) data in a corresponding subframe data region according to the DCI demodulated from the PDCCH.
However, in a wireless environment with strong interference on the PDCCH, when the user terminal receives data in the control region in a subframe corresponding to an interference slot, a large number of demodulation failures may occur, so that the number of times that the user terminal feeds back a Negative (NACK) message indicating the reception failure to the base station is increased, and thus, the service throughput of the system is reduced, and the overall service performance of the system is finally affected.
Disclosure of Invention
The invention provides a method and a device for processing PDCCH missed detection. The method is used for ensuring the data demodulation performance of the control area data under the condition that interference exists in the control area.
The embodiment of the invention provides the following specific technical scheme:
a processing method for PDCCH missed detection comprises the following steps:
the base station receives the PDCCH missed detection times reported by the user terminal according to a set period;
and when the base station determines that the PDCCH missed detection times received in N continuous periods are all larger than the set missed detection time threshold, rescheduling the PDCCH resources for the user terminal based on the PDSCH resources correctly scheduled last time.
Preferably, before the base station receives the PDCCH missed detection times reported by the user terminal according to the set period, the method further includes:
the base station counts the scheduled times, the service throughput and the times of returning negative NACK messages of the user terminal in the process that the user terminal uses the download service;
when the base station determines that one or any combination of the following conditions is met, the base station informs the user terminal to report the number of times of missed detection of the PDCCH according to a set period:
the scheduled times of the user terminal are larger than a set scheduling threshold;
the service throughput of the user terminal is less than the set cell service threshold;
the times of the user terminal continuously feeding back the NACK message is larger than the set feedback time threshold.
Preferably, the base station reschedules the PDCCH resource for the ue based on the PDSCH resource correctly scheduled last time, including:
and the base station takes the first M physical resource blocks PRB of the position of the PDSCH resource which is correctly scheduled last time as PDCCH resources for scheduling, wherein M is a preset value.
Preferably, after the base station reschedules the PDCCH resource for the ue based on the last correctly scheduled PDSCH resource, the method further includes:
the base station continues to receive the PDCCH missed detection times reported by the user terminal;
and when the base station determines that the received PDCCH missed detection times are not more than the set missed detection time threshold, the base station schedules PDCCH resources for the user terminal again according to the standard protocol.
Preferably, after the base station schedules the PDCCH resource for the ue according to the standard protocol, the method further includes:
the base station informs the user terminal of the number of missed detection times according to the stop of reporting.
A processing device for PDCCH omission comprises:
a receiving unit, configured to receive PDCCH missed-detection times reported by a user terminal according to a set period;
and the processing unit is used for determining that the PDCCH missed detection times received in the continuous N periods are all larger than a set missed detection time threshold, and rescheduling the PDCCH resources for the user terminal based on the PDSCH resources correctly scheduled last time.
Preferably, further comprising: a determination unit and a first notification unit, wherein,
a determining unit, configured to count scheduled times and service throughput of a user terminal and times of returning a negative NACK message during a process in which the user terminal uses a download service before the receiving unit receives PDCCH missed-detection times reported by the user terminal according to a set period; and when determining that one or any combination of the following conditions is met, notifying the user terminal to report the number of missed detection of the PDCCH according to a set period through the first notification unit:
the scheduled times of the user terminal are larger than a set scheduling threshold;
the service throughput of the user terminal is less than the set cell service threshold;
the times of the user terminal continuously feeding back the NACK message is larger than the set feedback time threshold.
Preferably, when the PDCCH resource is rescheduled for the ue based on the PDSCH resource correctly scheduled last time, the processing unit is specifically configured to include:
and taking the first M physical resource blocks PRB of the position of the PDSCH resource which is correctly scheduled last time as PDCCH resources for scheduling, wherein M is a preset value.
Preferably, the processing unit is further configured to:
and after the PDCCH resources are rescheduled for the user terminal based on the PDSCH resources correctly scheduled last time, continuously receiving the PDCCH missed detection times reported by the user terminal, and rescheduling the PDCCH resources for the user terminal according to the standard protocol when the received PDCCH missed detection times are determined to be not more than the set missed detection times threshold.
Preferably, further comprising:
and the second notification unit is used for notifying the user terminal of the number of missed tests according to the stop of reporting after the processing unit schedules the PDCCH resources for the user terminal again according to the standard protocol.
In the embodiment of the invention, a base station receives PDCCH missed detection times reported by a user terminal according to a set period, and reschedules PDCCH resources for the user terminal based on PDSCH resources correctly scheduled last time when the PDCCH missed detection times received in continuous N periods are determined to be larger than a set missed detection time threshold; obviously, the base station can detect the PDCCH channel quality of the user terminal in real time through the PDCCH missed detection times reported by the user terminal, and can call the PDCCH to occupy the PDSCH resource correctly scheduled last time for transmission when the PDCCH channel quality is determined to be poor, so that the transmission reliability of the PDCCH is improved.
Drawings
FIG. 1 is a schematic flow chart of a PDCCH missed detection process in an embodiment of the present invention;
FIG. 2 is a detailed flowchart of the PDCCH omission process in the embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a flexible allocation method for starting PDSCH resources in the embodiment of the present invention;
fig. 4 is a functional structure diagram of a base station in an embodiment of the present invention.
Detailed Description
In a wireless environment with strong interference, data mediation performance of a control area can be guaranteed. In the embodiment of the invention, a base station receives the PDCCH missed detection times reported by a user terminal, and when the PDCCH missed detection times received in continuous N periods are determined to be larger than a set missed detection time threshold, partial resources are required to be selected from PDSCH resources which are correctly scheduled last time for carrying out PDCCH resource scheduling.
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1, in the embodiment of the present invention, a schematic flow of a base station (eNB) performing PDCCH missed detection processing is as follows:
step 100: and the base station receives the PDCCH missed detection times reported by the user terminal according to a set period.
In practical application, the user terminal can report the number of missed detection times of the PDCCH by itself, and can also report the number of missed detection times of the PDCCH according to the notification of the base station.
Specifically, in the process that the user terminal uses the download service, the base station counts the scheduled times, the service throughput and the times of returning the NACK message of the user terminal, and when determining that one or any combination of the following conditions is met, notifies the user terminal to report the PDCCH missed detection times according to a set period:
1) the scheduled times of the user terminal are larger than a set scheduling threshold; user terminal
2) The service throughput of the user terminal is less than the set cell service threshold;
3) the times of the NACK message feedback of the user terminal is larger than the set feedback threshold.
Step 110: and when the base station determines that the PDCCH missed detection times received in N continuous periods are all larger than the set missed detection time threshold, rescheduling the PDCCH resources for the user terminal based on the PDSCH resources correctly scheduled last time.
Specifically, the base station may schedule the first M Physical Resource Blocks (PRBs) of the position of the PDSCH Resource correctly scheduled last time as the PDCCH Resource, where M is a preset value. In practical application, the value of M may be determined according to the number of PRBs occupied by PDSCD resources. For example, if PDSCH resources occupy 50 PRBs, M may be set to 5, and different application environments may be flexibly adjusted, which is not described herein any more.
After the scheduling operation, the base station continues to receive the number of times of missed detection of the PDCCH reported by the user terminal, and at the moment, the user terminal can continue to report according to the previously set period and can also automatically configure other periods for reporting; and when the base station determines that the number of the received PDCCH missed detections is not more than the set threshold of the number of the missed detections, the base station schedules PDCCH resources for the user terminal again according to the standard protocol (such as R9 protocol). Meanwhile, the base station also needs to inform the user terminal of the number of missed detections when the reporting is stopped.
The above embodiments are further described in detail by a specific application scenario.
Step A: after the UE accesses the network, in the process of downloading the service, the MAC layer (hereinafter referred to as MAC layer) in the eNB determines that the operating state of the UE satisfies the following conditions: the scheduling times of the UE are greater than a set scheduling threshold, the service throughput of the UE is less than a set cell service threshold, and the times of continuous NACK message feedback of the UE is greater than a set feedback time threshold; the MAC layer notifies an RRC layer (hereinafter, referred to as RRC layer) in the eNB of RRC initiation of PDCCH missed measure reporting through an interface message (e.g., O _ MAC RRC _ PDCCH _ REPORT).
And B: after receiving the measurement interface message of the MAC layer, the RRC layer constructs an RRC Reconfiguration message (rrcconnectionreconfiguration) and sends the RRC Reconfiguration message (rrcconnectionreconfiguration) to the UE. The RRC reconfiguration message carries a PDCCH missed-check reporting request and a reporting period. The reporting period is a user configurable parameter, that is, the UE can configure the reporting period according to the actual network environment and its own capability, and meanwhile, the RRC layer needs to notify the configured reporting period to the MAC layer.
And C: after receiving the RRC reconfiguration message sent by the RRC layer, the UE immediately starts PDCCH missed detection statistics according to a PDCCH missed detection reporting request carried by the UE, and reports the PDCCH missed detection times according to a reporting period notified by the RRC reconfiguration message.
Step D: and after the MAC layer receives the PDCCH missed detection times reported by the UE, when the PDCCH missed detection times reported by N (N can be configured by the eNB side) reporting periods are determined to be larger than a set missed detection time threshold, starting a PDCCH resource flexible allocation mode.
Specifically, the execution process of step D is shown in fig. 3:
step 300: the MAC layer judges whether the PDCCH missed detection times reported by the UE are larger than a set missed detection time threshold or not; if yes, go to step 310; otherwise, no processing is performed.
The PDCCH missed detection times is greater than the set missed detection times threshold, which indicates that there are more demodulation errors when the UE receives the PDCCH, and the erroneous reception of the PDCCH will affect the correct reception of the PDSCH service data.
Step 310: is the MAC layer determined that the number of consecutive reports of the UE is greater than N? If yes, go to step 320; otherwise, no processing is performed.
In step 310, the MAC layer executes step 320 only if it needs to determine that the PDCCH missed detection times reported by the UE for N consecutive times are all greater than the set missed detection time threshold.
Step 320: the MAC layer schedules PDCCH to occupy the first 5 PRBs in the PDSCH resource which is correctly scheduled last time (namely, UE feeds back ACK) for transmission.
The invention implements naming, after UE initiates PDCCH missed detection measurement report, PDCCH channel blind detection is carried out, and PDCCH data decoding is carried out on the first M PRBs in the resource position where PDSCH service data is correctly received last time. And self-judging whether the PDCCH occupies the resource position of the PDSCH for transmission.
Step E: and the MAC layer continuously receives the PDCCH missed detection times reported by the UE, and when the MAC layer judges that the PDCCH missed detection times are smaller than a preset missed detection time threshold, the flexible scheduling mode of the PDSCH is judged to be closed.
Step F: the MAC layer notifies the RRC layer to stop the PDCCH missed detection measurement reporting through an interface message (e.g., O _ MAC RRC _ PDCCH _ REPORT), and the MAC layer also stops continuously adopting the PDCCH resource flexible allocation manner, and continuously schedules the PDCCH resource for the UE according to the PDCCH allocation manner specified by the current R9 protocol.
Step G: after receiving the notification from the MAC layer, the RRC layer notifies the UE of stopping PDCCH missed measurement reporting through an RRC reconfiguration message (e.g., RRC ConnectionReconfiguration).
Based on the above embodiments, referring to fig. 4, in the embodiments of the present invention, the base station at least includes a receiving unit 40 and a processing unit 41:
a receiving unit 40, located at the MAC layer, configured to receive PDCCH missed-detection times reported by the user terminal according to a set period;
and the processing unit 41, located at the MAC layer, is configured to determine that the PDCCH missed detection times received in N consecutive periods are all greater than a set missed detection time threshold, and reschedule the PDCCH resource for the user terminal based on the PDSCH resource correctly scheduled last time.
Preferably, further comprising: a decision unit 42 (located at the MAC layer) and a first notification unit 43 (located at the RRC layer), wherein,
a determining unit 42, configured to count scheduled times and service throughput of the user terminal and times of returning a negative NACK message during a process in which the user terminal uses a download service before the receiving unit receives PDCCH missed-detection times reported by the user terminal according to a set period; and when determining that one or any combination of the following conditions is satisfied, notifying the user terminal to report the number of missed PDCCH detections according to a set period by the first notifying unit 43:
the scheduled times of the user terminal are larger than a set scheduling threshold;
the service throughput of the user terminal is less than the set cell service threshold;
the times of the user terminal continuously feeding back the NACK message is larger than the set feedback time threshold.
Preferably, when the PDCCH resource is rescheduled for the ue based on the PDSCH resource correctly scheduled last time, the processing unit 41 is specifically configured to include:
and taking the first M physical resource blocks PRB of the position of the PDSCH resource which is correctly scheduled last time as PDCCH resources for scheduling, wherein M is a preset value.
Preferably, the processing unit 41 is further configured to:
and after the PDCCH resources are rescheduled for the user terminal based on the PDSCH resources correctly scheduled last time, continuously receiving the PDCCH missed detection times reported by the user terminal, and rescheduling the PDCCH resources for the user terminal according to the standard protocol when the received PDCCH missed detection times are determined to be not more than the set missed detection times threshold.
Preferably, further comprising:
and a second notifying unit 44, located in the RRC layer, for notifying the ue of the number of missed detections when reporting is stopped after the processing unit 41 reschedules the PDCCH resource for the ue according to the standard protocol.
In the embodiment of the invention, a base station receives PDCCH missed detection times reported by a user terminal according to a set period, and reschedules PDCCH resources for the user terminal based on PDSCH resources correctly scheduled last time when the PDCCH missed detection times received in continuous N periods are determined to be larger than a set missed detection time threshold; obviously, the base station can detect the PDCCH channel quality of the user terminal in real time through the PDCCH missed detection times reported by the user terminal, and can call the PDCCH to occupy the PDSCH resource correctly scheduled last time for transmission when the PDCCH channel quality is determined to be poor, so that the transmission reliability of the PDCCH is improved.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as an apparatus, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely 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, CD-ROM, 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 apparatus, devices (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.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (6)
1. A processing method for Physical Downlink Control Channel (PDCCH) omission is characterized by comprising the following steps:
the base station receives the PDCCH missed detection times reported by the user terminal according to a set period;
when the base station determines that the PDCCH missed detection times received in N continuous periods are all larger than a set missed detection time threshold, taking the first M physical resource blocks PRB of the position where the PDSCH resource is correctly scheduled last time as PDCCH resources for scheduling, wherein M is a preset value;
after the base station reschedules the PDCCH resource for the user equipment based on the PDSCH resource correctly scheduled last time, the method further includes:
and the base station continuously receives the PDCCH missed detection times reported by the user terminal, and reschedules the PDCCH resources for the user terminal according to the standard protocol when the received PDCCH missed detection times is determined to be not more than the set missed detection time threshold.
2. The method of claim 1, wherein before the base station receives the PDCCH missed detection times reported by the user equipment according to a set period, the method further comprises:
the base station counts the scheduled times, the service throughput and the times of returning negative NACK messages of the user terminal in the process that the user terminal uses the download service;
when the base station determines that one or any combination of the following conditions is met, the base station informs the user terminal to report the number of times of missed detection of the PDCCH according to a set period:
the scheduled times of the user terminal are larger than a set scheduling threshold;
the service throughput of the user terminal is less than the set cell service threshold;
the times of the user terminal continuously feeding back the NACK message is larger than the set feedback time threshold.
3. The method of claim 1, wherein after the base station reschedules the PDCCH resources for the user terminal in accordance with the standard protocol, further comprising:
the base station informs the user terminal of the number of missed detection times according to the stop of reporting.
4. A processing device for missing detection of a Physical Downlink Control Channel (PDCCH) is characterized by comprising:
a receiving unit, configured to receive PDCCH missed-detection times reported by a user terminal according to a set period;
the processing unit is used for determining that the number of missed detections of the PDCCH received in N continuous periods is greater than a set missed detection number threshold, and scheduling the first M physical resource blocks PRB of the position of the PDSCH resource correctly scheduled last time as the PDCCH resource, wherein M is a preset value;
after rescheduling the PDCCH resources for the user terminal based on the last correctly scheduled PDSCH resources, the processing unit is further configured to:
and continuously receiving the PDCCH missed detection times reported by the user terminal, and re-scheduling PDCCH resources for the user terminal according to the standard protocol regulation when the received PDCCH missed detection times is determined to be not more than the set missed detection time threshold.
5. The apparatus of claim 4, further comprising: a determination unit and a first notification unit, wherein,
a determining unit, configured to count scheduled times and service throughput of a user terminal and times of returning a negative NACK message during a process in which the user terminal uses a download service before the receiving unit receives PDCCH missed-detection times reported by the user terminal according to a set period; and when determining that one or any combination of the following conditions is met, notifying the user terminal to report the number of missed detection of the PDCCH according to a set period through the first notification unit:
the scheduled times of the user terminal are larger than a set scheduling threshold;
the service throughput of the user terminal is less than the set cell service threshold;
the times of the user terminal continuously feeding back the NACK message is larger than the set feedback time threshold.
6. The apparatus of claim 4, further comprising:
and the second notification unit is used for notifying the user terminal of the number of missed tests according to the stop of reporting after the processing unit schedules the PDCCH resources for the user terminal again according to the standard protocol.
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