CN109818712B

CN109818712B - NPDCCH blind detection method and device based on narrowband Internet of things

Info

Publication number: CN109818712B
Application number: CN201711174184.3A
Authority: CN
Inventors: 任东坡; 陈耕雨
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2017-11-22
Filing date: 2017-11-22
Publication date: 2021-02-19
Anticipated expiration: 2037-11-22
Also published as: CN109818712A

Abstract

The embodiment of the invention provides a NPDCCH blind detection method and device based on a narrowband Internet of things, wherein the narrowband Internet of things comprises User Equipment (UE) and a base station, and the method comprises the following steps: the UE receives the MSG4 message of the base station; wherein the MSG4 message includes an NPDCCH maximum repetition number parameter, a starting position parameter, and an offset value parameter; the UE determines the NPDCCH sending period of the base station according to the NPDCCH maximum repetition number parameter and the initial position parameter; the UE determines the starting subframe according to the NPDCCH sending period and the offset value parameter; the UE determines a candidate blind detection parameter set according to the NPDCCH maximum repetition number parameter; the UE performs blind detection on the subframe bearing the NPDCCH by taking the starting subframe as a starting point according to the candidate blind detection parameter set to obtain downlink control information; and the UE performs data interaction with the base station by adopting the downlink control information, so that the conflict of NPDCCH searching space between the UEs is reduced, and the proportion of NPDCCH occupying subframes is improved.

Description

NPDCCH blind detection method and device based on narrowband Internet of things

Technical Field

The invention relates to the technical field of communication, in particular to an NPDCCH blind test method based on a narrowband Internet of things and an NPDCCH blind test device based on the narrowband Internet of things.

Background

A Narrowband Band Internet of Things (NB-IoT) is a low-power-consumption wide area network communication technology based on a cellular network, and an NPDCCH (Narrowband Physical Downlink Control Channel) is mainly used for carrying DCI (Downlink Control Information) in the Narrowband Internet of Things, including scheduling Information and other Control Information for Downlink and uplink data transmission. The scheduling process of the narrowband Internet of things comprises the following steps: an eNB (evolved Node B, evolved base station) generates DCI to indicate a scheduling time-frequency resource of a UE (User Equipment), the DCI is sent to the UE through an NPDCCH, and after receiving the NPDCCH, the UE receives Downlink data in an NPDSCH (Narrowband Physical Downlink Shared Channel) or sends Uplink data in an NPUSCH (Narrowband Physical Uplink Shared Channel). Therefore, the flexible and reliable NPDCCH scheduling mechanism can reasonably utilize time-frequency resources and realize efficient data transmission.

In the narrowband internet of things, 1 or 2 CCEs (Control Channel elements) carry one piece of DCI. 1 CCE occupies one subframe in the time domain and 6 subcarriers in the frequency domain. UE needs to search CCE starting position and CCE aggregation level where DCI is located in a control region, and the process is called NPDCCH blind detection; the existing blind detection parameter configuration scheme does not distinguish different application scenes, and the configured blind detection parameters may not meet the requirements of UE (user equipment) on power saving or throughput. Although the configuration scheme of the blind detection parameters can minimize the scheduling delay of the UE and maximize the throughput, it is not favorable for UE power saving, and no information such as coverage level and service model is referred to, which may make the collision probability of NPDCCH search space between UEs higher.

Disclosure of Invention

The embodiment of the invention provides an NPDCCH blind test method based on a narrowband Internet of things and a corresponding NPDCCH blind test device based on the narrowband Internet of things, and aims to solve the problem that the collision probability of an NPDCCH search space between UE is high due to the existing blind test parameter configuration scheme.

In order to solve the above problems, an embodiment of the present invention discloses an NPDCCH blind test method based on a narrowband internet of things, where the narrowband internet of things includes a user equipment UE and a base station, and the UE is connected to the base station, and the method includes:

the UE receives the MSG4 message of the base station; the MSG4 message includes a narrowband physical downlink control channel NPDCCH maximum repetition number parameter, an initial position parameter and an offset value parameter;

the UE determines the NPDCCH sending period of the base station according to the NPDCCH maximum repetition number parameter and the initial position parameter;

the UE determines the starting subframe according to the NPDCCH sending period and the offset value parameter;

the UE determines a candidate blind detection parameter set according to the NPDCCH maximum repetition number parameter;

the UE performs blind detection on the subframe bearing the NPDCCH by taking the starting subframe as a starting point according to the candidate blind detection parameter set to obtain downlink control information;

and the UE performs data interaction with the base station by adopting the downlink control information.

Preferably, the step of determining, by the UE, the NPDCCH transmission period of the base station according to the NPDCCH maximum repetition number parameter and the starting position parameter includes:

and the UE performs product operation on the NPDCCH maximum repetition number parameter and the initial position parameter to obtain the NPDCCH sending period.

Preferably, the candidate blind test parameter sets respectively include repetition times and aggregation levels; the aggregation levels comprise a first aggregation level and a second aggregation level; the step that the UE performs blind detection on the subframe bearing the NPDCCH by taking the starting subframe as a starting point according to the candidate blind detection parameter set to obtain downlink control information comprises the following steps:

when the repetition times is 1, performing blind detection on the subframe bearing the NPDCCH by taking the initial subframe as a starting point according to the first aggregation level and the second aggregation level respectively to obtain downlink control information;

and when the repetition times is greater than 1, performing blind detection on the subframe carrying the NPDCCH by taking the initial subframe as a starting point according to the second aggregation level to obtain downlink control information.

The embodiment of the invention also discloses an NPDCCH blind detection method based on the narrowband Internet of things, wherein the narrowband Internet of things comprises a base station and UE, the base station is connected with the UE, and the method comprises the following steps:

the base station sends a subframe bearing the NPDCCH according to the NPDCCH sending period;

and when the UE obtains the downlink control information in the subframe through blind detection, and the UE responds to the downlink control information to receive downlink data or sends uplink data to the base station, the base station performs data interaction with the UE according to the uplink data and the downlink data.

Preferably, the step of sending, by the base station, the NPDCCH-bearing subframe according to the NPDCCH sending cycle further includes:

the base station sends an MSG4 message to the UE; wherein the MSG4 message includes an NPDCCH maximum repetition number parameter, a starting position parameter, and an offset value parameter.

Preferably, the offset parameter includes a first offset parameter and a second offset parameter, and the offset parameter is obtained by:

the base station acquires a minimum repetition number parameter;

the base station determines an offset value threshold value by adopting the NPDCCH maximum repetition number parameter and the initial position parameter;

the base station judges whether the minimum repetition number parameter is less than or equal to the offset value threshold value;

when the minimum repetition number parameter is less than or equal to the offset value threshold value, the base station determines that the offset value parameter is a first offset value parameter;

and when the minimum repetition time parameter is greater than the offset value threshold value, the base station determines that the offset value parameter is a second offset value parameter.

Preferably, the first offset value parameter includes a first sub-offset value, a second sub-offset value, a third sub-offset value and a fourth sub-offset value, and the method further includes:

the base station performs preset operation according to the first sub-deviation value to obtain a second sub-deviation value;

the base station performs preset operation according to the second sub-deviation value to obtain a third sub-deviation value;

and the base station performs preset operation according to the third sub-deviation value to obtain a fourth sub-deviation value.

The embodiment of the invention also discloses an NPDCCH blind detection device based on the narrowband Internet of things, the narrowband Internet of things comprises UE and a base station, the UE is connected with the base station, and the device comprises:

a receiving module, configured to receive, by the UE, an MSG4 message of the base station; wherein the MSG4 message includes an NPDCCH maximum repetition number parameter, a starting position parameter, and an offset value parameter;

the NPDCCH sending period determining module is used for determining the NPDCCH sending period of the base station by the UE according to the NPDCCH maximum repetition number parameter and the initial position parameter; wherein,

a starting subframe determining module, configured to determine the starting subframe according to the NPDCCH transmission period and the offset parameter by the UE;

a candidate blind detection parameter set determining module, configured to determine a candidate blind detection parameter set according to the NPDCCH maximum repetition number parameter by the UE;

a downlink control information obtaining module, configured to perform blind detection on the subframe carrying the NPDCCH by using the starting subframe as a starting point according to the candidate blind detection parameter set by the UE, and obtain downlink control information;

and the first data interaction module is used for the UE to perform data interaction with the base station by adopting the downlink control information.

Preferably, the NPDCCH transmission period determining module includes:

and the NPDCCH sending period determining submodule is used for the UE to perform product operation on the NPDCCH maximum repetition number parameter and the initial position parameter so as to obtain the NPDCCH sending period.

Preferably, the candidate blind test parameter sets respectively include repetition times and aggregation levels; the aggregation levels comprise a first aggregation level and a second aggregation level; the downlink control information obtaining module comprises:

a first downlink control information obtaining sub-module, configured to perform blind detection on the subframe carrying the NPDCCH with the starting subframe as a starting point according to the first aggregation level and the second aggregation level respectively when the repetition number is 1, and obtain downlink control information;

and the first downlink control information obtaining submodule is used for performing blind detection on the subframe carrying the NPDCCH by taking the starting subframe as a starting point according to the second aggregation level when the repetition frequency is greater than 1, and obtaining downlink control information.

The embodiment of the invention also discloses an NPDCCH blind detection device based on the narrowband Internet of things, the narrowband Internet of things comprises a base station and UE, the base station is connected with the UE, and the device comprises:

the NPDCCH sending module is used for sending the sub-frame carrying the NPDCCH by the base station according to the NPDCCH sending period;

and the second data interaction module is used for performing data interaction with the UE according to the uplink and downlink data after the UE obtains the downlink control information in the subframe through blind detection and the UE responds to the downlink control information to receive the downlink data or sends the uplink data to the base station.

Preferably, the module connected to the NPDCCH transmitting module further comprises:

a sending module, configured to send, by the base station, an MSG4 message to the UE; wherein the MSG4 message includes an NPDCCH maximum repetition number parameter, a starting position parameter, and an offset value parameter.

Preferably, the apparatus further comprises:

a minimum repetition parameter obtaining module, configured to obtain, by the base station, a minimum repetition parameter;

an offset threshold determining module, configured to determine an offset threshold by using the NPDCCH maximum repetition number parameter and the starting position parameter by the base station;

a determining module, configured to determine whether the minimum repetition number parameter is less than or equal to the offset threshold by the base station;

a first determining module, configured to determine, by the base station, that the offset value parameter is a first offset value parameter when the minimum repetition number parameter is less than or equal to the offset value threshold;

a second determining module, configured to determine, by the base station, that the offset parameter is a second offset parameter when the minimum repetition number parameter is greater than the offset threshold.

Preferably, the first offset value parameter includes a first sub offset value, a second sub offset value, a third sub offset value and a fourth sub offset value, and the apparatus further includes:

a second sub-offset value obtaining module, configured to perform preset operation on the base station according to the first sub-offset value to obtain a second sub-offset value;

a third sub-offset value obtaining module, configured to perform preset operation on the base station according to the second sub-offset value to obtain a third sub-offset value;

and the fourth sub-deviation value obtaining module is used for the base station to perform preset operation according to the third sub-deviation value to obtain a fourth sub-deviation value.

The embodiment of the invention has the following advantages:

in the embodiment of the invention, the UE receives the MSG4 message of the base station; wherein the MSG4 message includes an NPDCCH maximum repetition number parameter, a starting position parameter, and an offset value parameter; the UE determines the NPDCCH sending period of the base station according to the NPDCCH maximum repetition number parameter and the initial position parameter; the UE determines the starting subframe according to the NPDCCH sending period and the offset value parameter; the UE determines a candidate blind detection parameter set according to the NPDCCH maximum repetition number parameter; the UE performs blind detection on the subframe bearing the NPDCCH by taking the starting subframe as a starting point according to the candidate blind detection parameter set to obtain downlink control information; the UE performs data interaction with the base station by adopting the downlink control information; in the embodiment of the invention, for the users with non-overlapping NPDCCHs, the offset value parameters of the special search space starting subframe are circularly configured according to different repetition times, so that the conflict of the NPDCCH search space between the UE is reduced, and the proportion of the NPDCCH occupying the subframe is favorably improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts;

fig. 1 is a flowchart of a first step of an NPDCCH blind test method based on a narrowband internet of things according to an embodiment of the present invention;

fig. 2 is a flowchart of steps of a second embodiment of a NPDCCH blind test method based on a narrowband internet of things according to the embodiment of the present invention;

FIG. 3 is a diagram of the offset location of a starting subframe according to an embodiment of the present invention;

FIG. 4 is a diagram of a dedicated search space according to an embodiment of the present invention;

fig. 5 is a structural block diagram of a third embodiment of an NPDCCH blind test device based on a narrowband internet of things according to the embodiment of the present invention;

fig. 6 is a block diagram of a fourth structure of an NPDCCH blind test device based on a narrowband internet of things according to the embodiment of the invention.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects solved by the embodiments of the present invention more clearly apparent, the embodiments of the present invention are described in further detail below with reference to the accompanying drawings and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, a flowchart of a first step of an NPDCCH blind test method based on a narrowband internet of things according to an embodiment of the present invention is shown, where the narrowband internet of things includes a user equipment UE and a base station, and the UE is connected to the base station, and the method specifically includes the following steps:

step 101, the UE receives an MSG (message) 4 message of the base station; wherein the MSG4 message includes an NPDCCH maximum repetition number parameter, a starting position parameter, and an offset value parameter;

in the embodiment of the present invention, the types of the Base station may include a macro Base station, a micro Base station, a pico Base station, a distributed Base station, and the like, and the embodiment of the present invention does not specifically limit this, and the Base station may mainly include a baseband processing Unit (Building Base band Unit), a Radio Remote Unit (Radio Remote Unit), and an antenna feed system;

the baseband processing unit mainly completes the functions of channel coding and decoding, modulation and demodulation of baseband signals, protocol processing and the like, and simultaneously needs to provide an interface function with an upper network element;

the remote radio unit mainly performs D/a (Digital to Analog) conversion of Digital signals, a/D (Analog to Digital) conversion of Analog signals, Digital up/down conversion and radio frequency signal modulation and demodulation on Digital/Analog signals received from/transmitted to the baseband processing unit, then performs power amplification/low noise amplification on the radio frequency Analog signals to be transmitted/received, and finally transmits the radio frequency Analog signals to the antenna feed system through the filter element for transmission. The remote radio unit needs to provide interfaces with the baseband processing unit and the antenna feed system;

the antenna feed system mainly comprises a feeder line and an antenna, and aims to centralize wireless signals received to the remote radio unit and then radiate the wireless signals out, and also centralize signals sent by user equipment and transmit the signals to the remote radio unit for processing.

Specifically applied to the embodiment of the present invention, the UE connected to the base station receives an MSG4 message from the base station, wherein the MSG4 message includes an NPDCCH maximum repetition number parameter, a starting position parameter, and an offset parameter; the MSG4 message is an RRC (Radio Resource Control) setup or reestablishment command sent by the base station to the UE, and the UE replies an MSG5 message to the base station to complete the RRC setup or reestablishment of the base station.

102, the UE determines an NPDCCH transmission period of the base station according to the NPDCCH maximum repetition number parameter and the starting position parameter;

in practical application to the embodiment of the present invention, the UE may determine the transmission period for the base station to transmit the NPDCCH according to the NPDCCH maximum repetition number parameter and the starting position parameter.

In a preferred embodiment of the present invention, the step of determining, by the UE, the NPDCCH transmission period of the base station according to the NPDCCH maximum repetition number parameter and the starting position parameter includes the following substeps:

and a substep S1021, the UE performs product operation on the NPDCCH maximum repetition time parameter and the initial position parameter to obtain the NPDCCH sending period.

In practical application to the embodiment of the present invention, the UE may perform a product operation on the NPDCCH maximum repetition number parameter and the starting position parameter to obtain the NPDCCH transmission period.

103, the UE determines the starting subframe according to the NPDCCH transmission period and the offset parameter;

specifically, in the embodiment of the present invention, the UE may determine the starting subframe according to the NPDCCH transmission period of the subframe and the offset parameter, the number of subframes is fixed in one NPDCCH transmission period, and the position of the starting subframe may be determined by shifting the fixed number of subframes according to the offset parameter.

For example, the offset value parameters include a first offset value parameter and a second offset value parameter, the first offset value parameter includes a first sub-offset value, a second sub-offset value, a third sub-offset value and a fourth sub-offset value, the first offset value parameter can be calculated according to a predetermined formula, for example, after a predetermined operation, the first sub-offset value is 0, the second sub-offset value is 1/8, the third sub-offset value is 1/4 and the fourth sub-offset value is 3/8, in the embodiment of the present invention, the NPDCCH transmission period T is determined by the maximum repetition number Rmax and the starting position parameter G, the starting subframe within the NPDCCH transmission period T is determined by the offset value parameter offset, i.e., the offset position is T offset, wherein if Rmax is 8, G is 2, and offset is 1/8, the NPDCCH transmission period (transmission period T (T) is 16(2 Rmax 8) subframes, an offset of 1/8 represents an offset of 2(1/8 × 16) subframes, starting with the 1 st subframe and determining the 3 rd subframe as the starting subframe.

104, the UE determines a candidate blind detection parameter set according to the NPDCCH maximum repetition number parameter;

further, the UE determines a candidate blind detection parameter set according to the NPDCCH maximum repetition number parameter, wherein the candidate blind detection parameter set may include a repetition number and an aggregation level, and the aggregation level includes a first aggregation level and a second aggregation level.

For example, when the NPDCCH maximum repetition parameter is 64, the repetition number may be 8, 16, 32, 64, and the aggregation level of the repetition number is 2, i.e., a second aggregation level; in addition, when the NPDCCH maximum repetition number parameter is 2, the repetition number may be 1, 2; when the number of repetitions is 1, the aggregation level of the number of repetitions is 1 or 2, that is, the first aggregation level or the second aggregation level, it should be noted that the correspondence relationship may be obtained by querying according to a protocol specification.

105, the UE performs blind detection on the subframe carrying the NPDCCH by using the starting subframe as a starting point according to the candidate blind detection parameter set to obtain downlink control information;

in the embodiment of the invention, the candidate blind test parameter set respectively comprises repetition times and aggregation levels; the aggregation levels comprise a first aggregation level and a second aggregation level; the step of obtaining downlink control information by the UE according to the candidate blind detection parameter set and with the starting subframe as a starting point for blind detection of the subframe carrying the NPDCCH comprises the following substeps:

substep S1051, when the repetition number is 1, performing blind detection on the subframe carrying the NPDCCH by using the starting subframe as a starting point according to the first aggregation level and the second aggregation level, respectively, to obtain downlink control information;

and a substep S1052, when the repetition number is greater than 1, performing blind detection on the subframe carrying the NPDCCH with the starting subframe as a starting point according to the second aggregation level, to obtain downlink control information.

In practical application, after a UE determines a starting subframe in a search space (a subframe requiring blind detection), the UE can detect a CCE in the subframe according to an aggregation level using the starting subframe as a starting point to obtain downlink control information; each subframe includes two CCEs, and when a first aggregation level L' is 1, the two CCEs in each subframe are respectively detected and may be denoted as {0} and {1 }; when the second aggregation level L' is 2, two CCEs in each subframe are simultaneously detected, which may be denoted as {0, 1 };

and 106, the UE performs data interaction with the base station by adopting the downlink control information.

Specifically, in the embodiment of the present invention, after obtaining DCI in a CCE, the UE may perform data interaction with the base station using the downlink control information, for example, receiving downlink data in NPDSCH or sending uplink data through NPUSCH, which is not limited in this embodiment of the present invention.

In the embodiment of the invention, the UE receives the MSG4 message of the base station; wherein the MSG4 message includes an NPDCCH maximum repetition number parameter, a starting position parameter, and an offset value parameter; the UE determines a sending period of NPDCCH sent by the base station according to the NPDCCH maximum repetition number parameter and the initial position parameter; the UE determines the starting subframe according to the NPDCCH sending period and the offset value parameter; the UE determines a candidate blind detection parameter set according to the NPDCCH maximum repetition number parameter; the UE performs blind detection on the subframe bearing the NPDCCH by taking the starting subframe as a starting point according to the candidate blind detection parameter set to obtain downlink control information; the UE performs data interaction with the base station by adopting the downlink control information; in the embodiment of the invention, for the users with non-overlapping NPDCCHs, the offset value parameters of the initial subframe of the special search space of the users are circularly configured according to different repetition times, so that the conflict of the NPDCCH search space between the UE is reduced, and the proportion of the NPDCCH occupying the subframe is favorably improved.

Referring to fig. 2, a flowchart illustrating a second step of an NPDCCH blind test method based on a narrowband internet of things according to an embodiment of the present invention is shown, where the narrowband internet of things includes a user equipment UE and a base station, and the UE is connected to the base station, and the method specifically includes the following steps:

step 201, the base station sends a MSG4 message to the UE; wherein the MSG4 message includes an NPDCCH maximum repetition number parameter, a starting position parameter, and an offset value parameter;

in the embodiment of the invention, in the RRC establishment process, the base station sends an MSG4 message to the UE, wherein the MSG4 message comprises an NPDCCH maximum repetition number parameter, a starting position parameter and an offset value parameter.

In a preferred embodiment of the present invention, the offset parameter includes a first offset parameter and a second offset parameter, and the obtaining of the offset parameter includes the following sub-steps:

step S2011, the base station acquires a minimum repetition number parameter;

step S2012, the base station determines an offset threshold using the NPDCCH maximum repetition number parameter and the starting position parameter;

step S2013, the base station judges whether the minimum repetition number parameter is less than or equal to the deviation value threshold value;

step S2014, when the minimum repetition number parameter is less than or equal to the offset value threshold, the base station determines that the offset value parameter is a first offset value parameter;

step S2015, when the minimum repetition number parameter is greater than the offset value threshold, the base station determines that the offset value parameter is a second offset value parameter.

Specifically, the base station may obtain a minimum repetition number parameter, and further determine an offset value threshold by using the NPDCCH maximum repetition number parameter and the starting position parameter; comparing the minimum repetition number parameter with an offset value threshold, when the minimum repetition number parameter is less than or equal to the offset value threshold, the base station determining that the offset value parameter is a first offset value parameter, where the first offset value parameter may be 0, and the first offset value parameter may also be 1/8, 1/4, 3/8, and when the minimum repetition number parameter is greater than the offset value threshold, the base station determining that the offset value parameter is a second offset value parameter, and the second offset value parameter may be 0, that is, no offset occurs; the base station circularly configures different offset value parameters for the accessed UE.

In practical application to the embodiment of the present invention, the first offset parameter includes a first sub-offset value, a second sub-offset value, a third sub-offset value, and a fourth sub-offset value, and the method further includes: the base station performs preset operation according to the first sub-deviation value to obtain a second sub-deviation value; and the base station performs preset operation according to the second sub-deviation value to obtain a third sub-deviation value, and performs preset operation according to the third sub-deviation value to obtain a fourth sub-deviation value, namely after the preset operation, the first sub-deviation value is 0, the second sub-deviation value is 1/8, the third sub-deviation value is 1/4, and the fourth sub-deviation value is 3/8.

The base station may perform a preset operation according to the first sub-offset value to obtain a second sub-offset value, and may also perform a preset operation according to the second sub-offset value to obtain a third sub-offset value; the formula of the predetermined operation is Offset_i＝((Offset_i X 8+1) mod 4)/8; wherein, Offset_iFor the offset parameter, i is 0, 1, 2, 3.

Step 202, the base station sends a subframe carrying the NPDCCH according to the NPDCCH sending period;

specifically, in the embodiment of the invention, the base station sends the sub-frame carrying the NPDCCH according to the NPDCCH sending period determined by the NPDCCH maximum repetition number parameter and the initial position parameter.

Step 203, when the UE obtains the downlink control information in the subframe through blind inspection, and the UE receives downlink data or sends uplink data to the base station in response to the downlink control information, the base station performs data interaction with the UE according to the uplink and downlink data.

Specifically, in the embodiment of the present invention, after the base station sends the subframe carrying the NPDCCH according to the repetition number, each UE may obtain the downlink control information in the subframe according to the NPDCCH maximum repetition number parameter, the starting position parameter, and the offset value parameter, and after the UE responds to the downlink control information to receive downlink data or sends uplink data to the base station, the base station may perform data interaction with the UE according to the uplink data and the downlink data.

In the embodiment of the invention, the base station sends an MSG4 message to the UE; wherein the MSG4 message includes an NPDCCH maximum repetition number parameter, a starting position parameter, and an offset value parameter; the base station sends a subframe bearing the NPDCCH according to the NPDCCH sending period; when the UE obtains downlink control information in the subframe through blind detection, and the UE responds to the downlink control information to receive downlink data or sends uplink data to the base station, the base station performs data interaction with the UE according to the uplink data and the downlink data; in the embodiment of the invention, the base station carries out NPDCCH dedicated resource configuration according to different demand scenes and different service models, improves the flexibility and reliability of NPDCCH dedicated resource configuration, circularly configures offset value parameters of the initial sub-frame of the dedicated search space according to different repetition times for users without NPDCCH overlapping, reduces the conflict of NPDCCH search space between UE, and is beneficial to improving the proportion of NPDCCH occupying sub-frames.

In order to make the embodiment of the present invention better understood by those skilled in the art, the following description is given by way of a specific example.

1. Configuration of NPDCCH maximum repetition number parameter (NPDCCH-NumRepetitions-r13)

This parameter represents the maximum number of repetitions of the UE-specific search space (USS) NPDCCH, and its value range is: 1,2,4,8, 16, 32, 64, 128, 256, 512, 1024, 2048. And the UE monitors a series of values (including aggregation level, repetition times, blind detection times and the like) according to the configured NPDCCH maximum repetition times parameter. This parameter determines the aggregation level and the set of repetition times of the NPDCCH that the UE needs to detect within the UE-specific search space at each coverage enhancement level. The table below gives the correspondence between the configuration values and the set of possible repetition times. For example, if the configuration value (i.e., NPDCCH maximum number of repetitions parameter Rmax) is 64, the number of possible repetitions used is 8, 16, 32, 64.

Table 1: correspondence between configuration values and sets of repetition times

Wherein the number of repetitions with a prime symbol indicates that the number of repetitions supports both NPDCCHs with aggregation level 1 and aggregation level 2.

After the base station configures Rmax for the UE, the aggregation level and the set of the repetition times which can be used by the base station are determined, and the UE carries out blind detection on the NPDCCH according to the set. For example Rmax of 64, the actual number of repetitions may be 8, 16, 32, 64, and the aggregation level used is 2. The reason why the aggregation level is 2 is that only the aggregation level 2 has the repeated transmission, and the aggregation level 1 has no repeated transmission, that is, when the repetition number is 1, the aggregation level has two cases of 1 and 2, and when the repetition number is greater than 1, only the aggregation level is 2, which corresponds to the repetition number with the "+" sign in the table. The specific principle is that a Media Access Control (MAC) layer of a base station maps a candidate blind detection parameter set (a lowest aggregation level (first aggregation level)/repetition times) required by a UE according to a coverage enhancement level of the UE, a Signal to Interference plus Noise Ratio (SINR) value, and the like, and reports the mapped candidate blind detection parameter set to an RRC layer of the base station. And the RRC layer of the base station configures the appropriate maximum repetition times according to the minimum aggregation level/repetition times required by the UE. The selection of the configuration values takes into account the following factors:

1) the aggregation level/repetition number set corresponding to the configuration value preferably comprises the lowest aggregation level/repetition number of the UE, so that the most suitable aggregation level/repetition number can be selected;

2) if the base station can adjust the aggregation level/repetition frequency selected by the UE in one RRC connection process of the UE, the lowest aggregation level/repetition frequency and the highest aggregation level/repetition frequency in the set corresponding to the suggested configuration value are not the lowest aggregation level/repetition frequency of the UE reported by the base station, so that the UE can adjust the aggregation level/repetition frequency in two directions;

3) the configuration value is recommended to be configured to be smaller as much as possible, so that the scheduling opportunities of the UE are dispersed in the time domain, and the situation that the scheduling opportunities are blocked by other signals is less likely to occur;

4) if the maximum throughput, lowest scheduling delay is to be achieved, the start position parameter npdcch-StartSF-USS-r13 needs to be set to a minimum value of 1.5. Since the protocol limits the interval between two adjacent search spaces to be at least 4ms, the minimum value of the configuration parameter is 8.

Assume that the lowest aggregation level/repetition number combination reported by the base station is { AL }_i，R_iConsidering the above factors, in two scenarios of pursuing throughput maximization and pursuing power saving, the specific configuration method is as follows:

1) if the maximum throughput is pursued and the scheduling delay is the lowest, the configuration value of the parameter is max (R)_i,8). The configuration can make the configuration value as small as possible, meet the requirements of large throughput and low scheduling delay, and meet the limitation that two adjacent search spaces are at least separated by 4 ms.

2) Otherwise, if the maximum power is pursued, the configuration value of the parameter is min (R)_iX 2,2048). Such a configuration enables a set corresponding to the configuration value to include R_iAnd the configuration value is made as small as possible.

2. Configuration of Offset parameter (npdcch-Offset-USS-r13)

The time domain starting position offset value parameter of the NPDCCH of the special search space has the following value range: 0,1/8,1/4,3/8.

The purpose of setting the offset value parameter is to reduce the conflict of NPDCCH searching space between the UE, thus being beneficial to improving the proportion of the NPDCCH occupying the sub-frame and enabling more downlink sub-frames to schedule the NPDCCH on the premise of not improving the blind detection times of the searching space of each UE. Therefore, in this regard, the NPDCCH search spaces configured by the UE should be staggered from each other as much as possible.

If the UE can be uniformly divided into N NPDCCH search space offset parameters and the search spaces of different offset parameters are not overlapped, the number of NPDCCHs required to be sent per second by the UE in the search space corresponding to each offset parameter is 1/N of the number of all UEs, and the number of NPDCCHs required to be configured per second by the search space corresponding to each offset parameter is also 1/N of the number of NPDCCHs required by all UEs under the requirement of the same collision probability. Therefore, the N value is taken as large as possible, the time length of each UE for monitoring the NPDCCH searching space can be reduced on the premise of not increasing the NPDCCH conflict probability, and the electric quantity of the UE is saved.

Considering the value range and meaning of this parameter, it is proposed to distribute the UEs evenly over the 4 offset parameters. However, there is a precondition that the NPDCCH number of all UEs is increased from the time domain after the staggering. If the staggering is not enough time for the NPDCCH of the UE to not overlap, the staggering plays no role, and no shifting is suggested. Whether the offset is included can be determined whether the ending time of the first NPDCCH in the search space with the offset parameter of 0 and the starting time of the first NPDCCH in the search space with the offset parameter of 3/8 overlap in the time domain. If it is not

Then it is assumed that multiple offset value parameters can be configured, otherwise, it is not. Wherein R is the minimum repetition number of the UE obtained in the calculation process of the parameter npdcch-MaxNumRepetitions-R13.

Referring to fig. 3, a diagram of the Offset position of the starting subframe according to an embodiment of the present invention is shown, and as shown in fig. 3, the Offset parameter Offset may be 0, 1/8, 1/4, 3/8; different offset value parameters are configured for each UE cycle of access, the cycle needs to distinguish the number of repetitions, and each repetition number is circulated independently. R for each possible configuration of the configuration NPDCCH maximum number of repetitions parameter NPDCCH-MaxNumRepetitions-R13_iValue, base station maintains the current Offset parameter Offset_iThe value is obtained. This value is initialized to 0 and may take on values of 0, 1/8, 1/4, 3/8. If one UE enters RRC connection state and needs to configure the parameter, the npdcch-Offset-USS-r13 of the UE is configured as Offset_iWhere i may be 0, 1, 2, 3, and may be calculated according to the following formula: .

1) If it is not

Of NPDCCHThe sending period T is (Rmax) npdcch-MaxNumRepetitions-R13 multiplied by (initial position parameter G) npdcch-StartSF-USS-R13, R is the minimum repetition number required by the UE obtained in the calculation process of the parameter npdcch-MaxNumRepetitions-R13, and then Offset_i＝((Offset_i×8+1)mod4)/8。

2) Else Offset_i＝0

3. Configuration of the starting position parameter (npdcch-StartSF-USS-r13)

The initial position parameter configures the time domain initial subframe position of the NPDCCH of the special search space, and the value range is as follows: 1.5,2,4,8, 16, 32, 48, 64.

If a larger NPDCCH period is configured for the UE, the power saving of the UE is facilitated, but the scheduling opportunity of the UE is reduced, and the scheduling delay of the UE is increased. On the contrary, if a smaller NPDCCH period is configured for the UE, the power saving of the UE is not facilitated, but the scheduling opportunity of the UE is increased, and the scheduling delay of the UE is reduced. The configuration value of the NPDCCH period is related to the desired target. The specific configuration method comprises the following steps:

1) if the maximum throughput is pursued, the scheduling delay is the lowest, and the starting position parameter is 1.5 (the density is the maximum at this time).

2) Otherwise, the most power is pursued, and according to the coverage level of the user, the configuration of the management station is carried out (one value is configured for each coverage level).

The configuration of the management station needs to be calculated according to a specific scene, and each coverage grade corresponds to a management station configuration value. The average required number of NPDCCHs for a UE from entering an RRC connected state to entering an RRC idle state is first estimated. If the maximum number of UEs that the cell needs to support, the UE distribution of various NPDCCH repetition times, and the traffic model of the UE are also known, it can be determined that the number of NPDCCH that the cell needs to transmit per second for a certain repetition time.

Assuming that the number of NPDCCHs transmitted by a cell per second is N for a certain number of repetitions, and the number of repetitions required by each NPDCCH is R, it can be determined that the length of time that the NPDCCH needs to occupy per second is N × R, i.e., the density of the NPDCCHs in the downlink channel is at least 1/(N × R). The maximum starting position parameter G that meets this density requirement can be determined by comparison with a configurable starting position parameter G, which is the configured value. Care is also taken in configuration to ensure that the calculated T value is greater than or equal to 4 and that the two NPDCCH transmissions are spaced apart by more than 4 ms.

Referring to fig. 4, a diagram of a dedicated search space according to an embodiment of the present invention is shown, as shown in fig. 4, an NPDCCH transmission period is determined by Rmax and G, and a position of a starting subframe, i.e., an offset, in the NPDCCH transmission period is determined by offset, where Rmax is 8, G is 2, and offset is 1/8, so that the NPDCCH transmission period is 16(2 × 8) subframes, and offset is 1/8 representing 2(1/8 × 16) subframes, and the 3 rd subframe is determined as the starting subframe; specifically, the blind detection of the subframe can be performed through the following steps:

step 1, the base station configures Rmax, G and offset values of the UE through MSG 4;

step 2, the UE determines an NPDCCH sending period T (Rmax G) of the NPDCCH according to the Rmax and the G;

step 3, UE determines the initial subframe of the special search space of the NPDCCH user according to T and offset;

step 4, the UE determines the possible repetition times R and the aggregation level according to Rmax, namely determines a candidate blind test parameter set during blind test;

step 5, when the base station needs to carry out uplink/downlink data scheduling, NPDCCH is sent at a corresponding position;

step 6, the UE carries out blind detection in a search space according to the candidate blind detection parameter set, and for the situation that the repetition frequency is 1, the UE needs to carry out detection respectively according to the aggregation level 1 (a first aggregation level) and the aggregation level 2 (a second aggregation level), and for the situation that the repetition frequency is more than 1, the UE needs to carry out detection according to the aggregation level 2;

and 7, the UE receives or transmits data according to the detected DCI.

It should be noted that, for simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the illustrated order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.

Referring to fig. 5, a block diagram of a third embodiment of an NPDCCH blind detection device based on a narrowband internet of things according to an embodiment of the present invention is shown, where the narrowband internet of things includes a user equipment UE and a base station, and the UE is connected to the base station, and specifically includes the following modules:

a receiving module 301, configured to receive, by the UE, an MSG4 message of the base station; wherein the MSG4 message includes an NPDCCH maximum repetition number parameter, a starting position parameter, and an offset value parameter;

an NPDCCH sending period determining module 302, configured to determine, by the UE, a sending period in which the base station sends an NPDCCH according to the NPDCCH maximum repetition number parameter and the initial position parameter;

a starting sub-determining module 303, configured to determine the starting sub-frame according to the NPDCCH sending period and the offset parameter by the UE;

a candidate blind detection parameter set determining module 304, configured to determine a candidate blind detection parameter set according to the NPDCCH maximum repetition number parameter by the UE;

a downlink control information obtaining module 305, configured to perform blind detection on the subframe carrying the NPDCCH by the UE according to the candidate blind detection parameter set, using the starting subframe as a starting point, and obtain downlink control information;

a first data interaction module 306, configured to perform data interaction with the base station by the UE using the downlink control information.

Preferably, the NPDCCH transmission period determining module includes:

Referring to fig. 6, a block diagram of a fourth embodiment of the NPDCCH blind detection device based on a narrowband internet of things according to the embodiment of the present invention is shown, where the narrowband internet of things includes a base station and a UE, and the base station is connected to the UE, and specifically includes the following modules:

a subframe sending module 401, configured to send, by the base station, a subframe carrying the NPDCCH according to the NPDCCH sending period;

a second data interaction module 402, configured to perform data interaction with the UE according to the uplink and downlink data after the UE obtains the downlink control information in the subframe through blind detection, and the UE receives downlink data or sends uplink data to the base station in response to the downlink control information.

Preferably, the module connected to the subframe transmitting module further comprises:

Preferably, the apparatus further comprises:

For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.

The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of 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, embodiments of 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.

Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal 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 terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, 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 terminal 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 terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal 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 of these 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 embodiments of the invention.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.

The NPDCCH blind test method based on the narrowband internet of things and the NPDCCH blind test device based on the narrowband internet of things provided by the invention are introduced in detail, specific examples are applied in the text to explain the principle and the implementation mode of the invention, and the description of the above embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. The NPDCCH blind detection method based on the narrowband Internet of things is characterized in that the narrowband Internet of things comprises User Equipment (UE) and a base station, the UE is connected with the base station, and the method comprises the following steps:

the UE determines an initial subframe according to the NPDCCH sending period and the offset value parameter; the offset value parameters comprise a first offset value parameter and a second offset value parameter, wherein the first offset value parameter comprises a first sub-offset value, a second sub-offset value, a third sub-offset value and a fourth sub-offset value, and is used for being configured to the UE in a circulating manner; when the minimum repetition number parameter is less than or equal to the offset value threshold value, the offset value parameter is a first offset value parameter; when the minimum repetition number parameter is greater than the offset value threshold, the offset value parameter is a second offset value parameter;

the minimum repetition number parameter is obtained through the base station; the offset value threshold value is determined by the NPDCCH maximum repetition number parameter and the initial position parameter; the offset value threshold value is 3T/8; t is the NPDCCH sending period;

the UE performs blind detection on a subframe bearing NPDCCH by taking the starting subframe as a starting point according to the candidate blind detection parameter set to obtain downlink control information;

2. The method of claim 1, wherein the step of the UE determining the NPDCCH transmission period of the base station according to the NPDCCH maximum repetition number parameter and the starting position parameter comprises:

3. The method of claim 1, wherein the candidate blind test parameter sets respectively comprise a repetition number and an aggregation level; the aggregation levels comprise a first aggregation level and a second aggregation level; the step that the UE performs blind detection on the subframe bearing the NPDCCH by taking the starting subframe as a starting point according to the candidate blind detection parameter set to obtain downlink control information comprises the following steps:

4. The NPDCCH blind detection method based on the narrowband Internet of things is characterized in that the narrowband Internet of things comprises a base station and UE, the base station is connected with the UE, and the method comprises the following steps:

the base station sends an MSG4 message to the UE; wherein the MSG4 message includes an NPDCCH maximum repetition number parameter, a starting position parameter, and an offset value parameter; the offset value parameters comprise a first offset value parameter and a second offset value parameter; the first offset parameter comprises a first sub-offset value, a second sub-offset value, a third sub-offset value and a fourth sub-offset value, and is configured to the UE in a cyclic manner; when the minimum repetition number parameter is less than or equal to the offset value threshold value, the offset value parameter is a first offset value parameter; when the minimum repetition number parameter is greater than the offset value threshold, the offset value parameter is a second offset value parameter;

5. The method of claim 4, wherein the offset parameter is obtained by:

the base station acquires a minimum repetition number parameter;

6. The method of claim 5, further comprising:

7. The utility model provides a NPDCCH blind test device based on narrowband thing networking, which is characterized in that narrowband thing networking includes UE and basic station, UE with the basic station is connected, the device includes:

a starting subframe determining module, configured to determine a starting subframe according to the NPDCCH transmission period and the offset parameter by the UE; the offset value parameters comprise a first offset value parameter and a second offset value parameter, wherein the first offset value parameter comprises a first sub-offset value, a second sub-offset value, a third sub-offset value and a fourth sub-offset value, and is used for being configured to the UE in a circulating manner; when the minimum repetition number parameter is less than or equal to the offset value threshold value, the offset value parameter is a first offset value parameter; when the minimum repetition number parameter is greater than the offset value threshold, the offset value parameter is a second offset value parameter;

a downlink control information obtaining module, configured to perform blind detection on a subframe carrying an NPDCCH by the UE according to the candidate blind detection parameter set, using the starting subframe as a starting point, and obtain downlink control information;

8. The apparatus of claim 7, wherein the NPDCCH transmission period determining module comprises:

9. The apparatus of claim 7, wherein the candidate blind detection parameter sets respectively comprise a repetition number and an aggregation level; the aggregation levels comprise a first aggregation level and a second aggregation level; the downlink control information obtaining module comprises:

10. The utility model provides a NPDCCH blind test device based on narrowband thing networking, which is characterized in that narrowband thing networking includes base station and UE, the base station with UE connects, the device includes:

a subframe sending module, configured to send, by the base station, a subframe carrying the NPDCCH according to the NPDCCH sending period;

the second data interaction module is used for performing data interaction with the UE according to the uplink and downlink data after the UE obtains the downlink control information in the subframe through blind detection and the UE responds to the downlink control information to receive the downlink data or sends the uplink data to the base station;

a sending module, configured to send, by the base station, an MSG4 message to the UE; wherein the MSG4 message includes an NPDCCH maximum repetition number parameter, a starting position parameter, and an offset value parameter; the offset value parameters comprise a first offset value parameter and a second offset value parameter; the first offset parameter comprises a first sub-offset value, a second sub-offset value, a third sub-offset value and a fourth sub-offset value, and is configured to the UE in a cyclic manner; when the minimum repetition number parameter is less than or equal to the offset value threshold value, the offset value parameter is a first offset value parameter; when the minimum repetition number parameter is greater than the offset value threshold, the offset value parameter is a second offset value parameter;

the minimum repetition number parameter is obtained through the base station; the offset value threshold value is determined by the NPDCCH maximum repetition number parameter and the initial position parameter; the offset value threshold value is 3T/8; and T is the NPDCCH sending period.

11. The apparatus of claim 10, further comprising:

12. The apparatus of claim 11, further comprising: