CN109168169B - Coverage grade upgrading method and device - Google Patents

Coverage grade upgrading method and device Download PDF

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Publication number
CN109168169B
CN109168169B CN201811015257.9A CN201811015257A CN109168169B CN 109168169 B CN109168169 B CN 109168169B CN 201811015257 A CN201811015257 A CN 201811015257A CN 109168169 B CN109168169 B CN 109168169B
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terminal
cell
coverage
coverage level
channel capacity
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CN109168169A (en
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张力方
胡泽妍
赵元
胡云
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China United Network Communications Group Co Ltd
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China United Network Communications Group Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

The embodiment of the application discloses a coverage grade upgrading method and a coverage grade upgrading device, relates to the technical field of communication, and solves the problems that the service transmission delay is large and the access of subsequent services is influenced due to the existing coverage grade upgrading method. The specific scheme is as follows: acquiring a coverage grade i of a terminal; and determining whether to upgrade the coverage grade of the terminal according to the coverage grade i of the terminal, Reference Signal Received Power (RSRP), the upper limit value of the channel capacity of the cell and the signal-to-noise ratio of the terminal.

Description

Coverage grade upgrading method and device
Technical Field
The embodiment of the application relates to the technical field of communication, in particular to a coverage grade upgrading method and device.
Background
A Narrow-Band Internet of Things (NB-IoT) based on honeycomb is an Internet of Things technology based on 3GPP LTE standard protocol evolution, and is mainly oriented to an Internet of Things application scene with medium-low speed, deep coverage, low power consumption and large connection. The 3GPP specifies that NB-IoT is 20dB higher than General Packet Radio Service (GPRS) in coverage, supports three coverage classes including coverage class 0, coverage class 1, and coverage class 2, and provides coverage enhancement in downlink through data repetition and in uplink through data repetition and uplink power spectral density boosting.
In the existing access technology, a base station configures the number of random access attempts of a terminal under each coverage level, and when a user fails to attempt access for several times, the access technology is raised to the next coverage level, and the user tries the access with parameters of a higher coverage level. Therefore, when a large number of terminals access simultaneously at the position of good signal quality, if the access of part of the terminals fails due to insufficient channel capacity, the terminals still rise to the next coverage level to try to access, which causes a large service transmission delay and affects the access of subsequent services.
Disclosure of Invention
The embodiment of the application provides a coverage grade upgrading method and device, which can avoid the problem of low user access rate under a new coverage grade caused by unsuccessful access coverage grade jump of a user under the condition of good signal quality.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:
in a first aspect of an embodiment of the present application, a coverage level upgrading method is provided, where the method includes: acquiring a coverage grade i, i ═ 0, 1, 2 of a terminal, wherein the terminal is a terminal in the coverage area of the cell, and the terminal is not successfully accessed to the cell; and determining whether to upgrade the coverage grade of the terminal according to the coverage grade i of the terminal, Reference Signal Received Power (RSRP), the upper limit value of the channel capacity of the cell and the signal-to-noise ratio of the terminal. The channel capacity upper limit value of the cell specifically is as follows: volumch＝Systemch(1+ β), wherein, VolumchFor the channel capacity upper limit, System, of a cellchIs the number of system sub-carriers, beta is the channel capacity proportionality coefficient, beta is more than or equal to 0 and less than or equal to 1. Based on the scheme, the problem of low user access rate under a new coverage grade caused by the fact that the user unsuccessfully accesses to perform coverage grade jumping under the condition of good signal quality can be solved.
With reference to the first aspect, in a first possible implementation manner, the determining whether to upgrade a coverage level of a terminal includes: determining whether the RSRP of the terminal is smaller than a first preset threshold value; the first preset threshold is a boundary RSRP of the coverage grade i and the coverage grade i + 1; and if the RSRP of the terminal is smaller than a first preset threshold value, upgrading the coverage grade of the terminal. Based on the scheme, when the terminal is at the signal difference point position, the coverage grade of the terminal can be upgraded, so that the repeated access times of the terminal are increased, and the cell is successfully accessed.
With reference to the first aspect and the foregoing possible implementation manners, in another possible implementation manner, the determining whether to upgrade a coverage level of the terminal further includes: if the RSRP of the terminal is greater than or equal to a first preset threshold value, determining whether the number of users initiating access requests in a cell in unit time is greater than or equal to the upper limit value of the channel capacity of the cell; and if the number of users initiating access requests in the cell in unit time is greater than or equal to the upper limit value of the channel capacity of the cell, the coverage grade of the terminal is not upgraded. Based on the scheme, when the terminal is located at the position with good signal quality and the terminal is unsuccessfully accessed due to channel capacity congestion, the access can be continuously requested without upgrading the coverage grade, and when the number of users in the cell is reduced, the terminal can be successfully accessed into the cell, so that the time delay of service transmission is reduced compared with the prior art.
With reference to the first aspect and the foregoing possible implementation manners, in another possible implementation manner, the determining whether to upgrade a coverage level of the terminal further includes: if the number of users initiating access requests in a cell in unit time is smaller than the upper limit value of the channel capacity of the cell, determining whether the signal-to-noise ratio of a terminal is smaller than a second preset threshold value; the second preset threshold is the difference value between the target receiving signal-to-noise ratio of the terminal and the target signal-to-noise ratio floating value; and if the signal-to-noise ratio of the terminal is smaller than a second preset threshold value, upgrading the coverage grade of the terminal. Based on the scheme, when the SNR of the current terminal is too poor to cause the access of the terminal to the cell to fail, the coverage grade of the terminal is upgraded, so that the repeated access times of the terminal are increased, and the cell is successfully accessed.
With reference to the first aspect and the foregoing possible implementation manners, in another possible implementation manner, the coverage level of the terminal is upgraded to a coverage level i of the terminal to a coverage level i + 1. Based on the scheme, the repeated access times of the terminal with the upgraded coverage grade can be increased, so that the terminal can successfully access the cell.
In a second aspect of the embodiments of the present application, there is provided a coverage level upgrade, where the apparatus includes: an obtaining unit, configured to obtain a coverage level i, i being 0, 1, 2 of a terminal, where the terminal is a terminal in a coverage area of the cell and the terminal does not successfully access the cell; and the processing unit is used for determining whether to upgrade the coverage grade of the terminal according to the coverage grade i of the terminal, the Reference Signal Received Power (RSRP), the upper limit value of the channel capacity of the cell and the signal-to-noise ratio of the terminal. The channel capacity upper limit value of the cell specifically is as follows: volumch＝Systemch(1+ β), wherein, VolumchFor the channel capacity upper limit value of the cell, SystemchIs a system sub-carrierThe wave number beta is a channel capacity proportionality coefficient, and beta is more than or equal to 0 and less than or equal to 1.
With reference to the second aspect, in a first possible implementation manner, the processing unit is specifically configured to determine whether an RSRP of the terminal is smaller than a first preset threshold; the first preset threshold is a boundary RSRP of the coverage grade i and the coverage grade i + 1; and if the RSRP of the terminal is smaller than the first preset threshold, the processing unit is further used for upgrading the coverage grade of the terminal.
With reference to the second aspect and the foregoing possible implementation manner, in another possible implementation manner, if the RSRP of the terminal is greater than or equal to a first preset threshold, the processing unit is further configured to determine whether the number of users initiating an access request in a cell in a unit time is greater than or equal to an upper limit value of a channel capacity of the cell; if the number of users initiating access requests in the cell in unit time is larger than or equal to the upper limit value of the channel capacity of the cell, the processing unit does not upgrade the coverage grade of the terminal.
With reference to the second aspect and the foregoing possible implementation manner, in another possible implementation manner, if the number of users initiating an access request in a cell within a unit time is smaller than an upper limit of a channel capacity of the cell, the processing unit is further configured to determine whether a signal-to-noise ratio of the terminal is smaller than a second preset threshold; the second preset threshold is the difference value between the target receiving signal-to-noise ratio of the terminal and the target signal-to-noise ratio floating value; and if the signal-to-noise ratio of the terminal is smaller than a second preset threshold, the processing unit is further used for upgrading the coverage grade of the terminal.
With reference to the second aspect and the foregoing possible implementation manners, in another possible implementation manner, the coverage level of the terminal is upgraded to a coverage level i of the terminal to a coverage level i + 1.
The above second aspect and descriptions of effects of various implementation manners of the second aspect may refer to descriptions of corresponding effects of the first aspect, and are not described herein again.
In a third aspect of the embodiments of the present application, a server is provided, where the server includes a processor and a memory, the memory is configured to be coupled to the processor and store necessary program instructions and data of the server, and the processor is configured to execute the program instructions stored in the memory, so that the server executes the method described above.
A fourth aspect of embodiments of the present application provides a computer storage medium, where a computer program code is stored, and when the computer program code runs on a processor, the processor is caused to execute the coverage level upgrade method described in the first aspect or any of the possible implementation manners of the first aspect.
In a fifth aspect of the embodiments of the present application, there is provided a computer program product, which stores computer software instructions executed by the processor, and the computer software instructions include a program for executing the aspects described above.
In a sixth aspect of the embodiments of the present application, there is provided an apparatus, which exists in the form of a chip product, and which includes a processor and a memory, the memory is configured to be coupled to the processor and stores necessary program instructions and data of the apparatus, and the processor is configured to execute the program instructions stored in the memory, so that the apparatus performs the functions of the coverage level upgrading apparatus in the method.
Drawings
Fig. 1 is a schematic view of a coverage level provided by an embodiment of the present application;
fig. 2 is a schematic diagram of an NB-IoT network architecture according to an embodiment of the present disclosure;
fig. 3 is a flowchart of a coverage level upgrading method according to an embodiment of the present application;
fig. 4 is a schematic composition diagram of an overlay level upgrade apparatus according to an embodiment of the present disclosure;
fig. 5 is a schematic composition diagram of another coverage level upgrade apparatus provided in an embodiment of the present application.
Detailed Description
First, some terms referred to in the embodiments of the present application are explained:
1. coverage grade
The coverage grade upgrading method is applied to an NB-Iot network, the network supports three coverage grades, the Maximum Coupling Loss (MCL) resistance can be respectively 144dB, 154dB and 164dB, downlink coverage enhancement is brought by data repetition, and uplink coverage enhancement is brought by data repetition and the mode of increasing the power spectrum density of uplink; the three coverage levels are defined as follows:
● cover level 0(CEL 0): MCL is less than 144 dB;
● cover level 1(CEL 1): MCL is less than 154 dB;
● cover level 2(CEL 2): MCL is less than 164 dB;
under different coverage levels, the base station can configure different preamble access times, and the higher the coverage level is, the larger the repeated access times configured by the base station is.
2. Boundary RSRP
For example, the RSRP boundary in the embodiment of the present application is a RSRP boundary of a coverage level i and a coverage level i +1, as shown in fig. 1, RSRP1 is a RSRP boundary of a coverage level 0 and a coverage level 1, and RSRP2 is a RSRP boundary of a coverage level 1 and a coverage level 2. The value of the boundary RSRP is pre-configured by the base station. For example, the RSRP1 boundary for coverage level 0 and coverage level 1 may be-110 dB, and the RSRP2 boundary for coverage level 1 and coverage level 2 may be-120 dB. The specific value of the RSRP boundary for different coverage levels is not limited in the embodiments of the present application, and is merely an exemplary illustration here.
In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
An embodiment of the present application provides a coverage level upgrading method, which may be applied to an NB-Iot network architecture shown in fig. 2, where the network architecture includes a terminal 201, a base station 202, a core network 203, an internet of things platform 204, and an application server 205.
The terminal 201 may be an NB-IoT terminal, and the terminal 201 may be connected to the base station through an air interface.
And the base station 202 is configured to undertake related functions such as air interface access processing, cell management, and the like, connect with the IoT core network through the S1-lite interface, and forward data of the non-access layer to a higher-layer network element for processing.
And the core network 203 is configured to assume a function of interacting with the terminal non-access stratum, and forward IoT service-related data to the IoT platform for processing.
And the internet of things platform 204 is used for aggregating the IoT data obtained from various access networks and forwarding the IoT data to corresponding service appliers for processing according to different types.
The application server 205 is a final aggregation point of the IoT data, and performs operations such as data processing according to the needs of the client.
The embodiments of the present application do not limit the devices included in the NB-Iot network architecture, and fig. 2 is only an exemplary illustration.
In order to solve the problem that in the background art, when a large number of terminals access simultaneously at a position where the signal quality is good, if the channel capacity is insufficient and a part of the terminals fail to access, the terminals still rise to the next coverage level to try to access, which causes a large service transmission delay and affects the access of subsequent services, the embodiment of the application provides a coverage level upgrading method, which can avoid the problem that the user access rate is low under a new coverage level due to the fact that the access is unsuccessful to perform coverage level hopping under the condition that the signal quality is good. It is understood that the coverage level upgrading method in the following embodiments of the present application is adopted when the terminal does not successfully access the cell.
With reference to fig. 1 and fig. 2, as shown in fig. 3, a cell method provided in the embodiment of the present application may include S301 to S307.
S301, a coverage level i, i of the terminal is obtained as 0, 1, 2.
Illustratively, the coverage level i of the terminal may be coverage level 0, coverage level 1, or coverage level 2. In the embodiment of the present application, the coverage level of the terminal is not limited, and here, the coverage level of the terminal is only given as 1 for example. It can be understood that the terminal in the embodiment of the present application is a terminal that does not successfully access a cell within a coverage area of the cell.
S302, whether Reference Signal Received Power (RSRP) of the terminal is smaller than a first preset threshold value or not is determined.
The first preset threshold is a boundary RSRP of a coverage level i and a coverage level i + 1.
Illustratively, the RSRP boundary is an RSRP boundary that distinguishes different coverage levels, and the RSRP boundary is related to the coverage level of the terminal, for example, if the coverage level of the terminal is 0, the first preset threshold is the RSRP boundary that covers level 0 and level 1, and is denoted as RSRP 1; if the coverage level of the terminal is 1, the first preset threshold is a boundary RSRP of the coverage level 1 and the coverage level 2, which is recorded as RSRP 2.
Exemplary, RSRP of the terminal, which may be denoted as RSRPUEThe comparing the RSRP of the terminal with the first preset threshold may include: if the coverage grade of the terminal is 1, comparing the RSRP of the terminalUEAnd RSRP2 to determine whether the terminal is currently in a signal good point position or a signal bad point position. If RSRPUELess than RSRP2, it is determined that the terminal is currently in a signal difference location. If RSRPUEGreater than RSRP2, it is determined that the terminal is currently in a signal sweet spot position.
And S303, if the RSRP of the terminal is smaller than a first preset threshold value, upgrading the coverage grade of the terminal.
Illustratively, the RSRP of the terminalUEAnd if the signal quality is less than the RSRP2, the received signal quality of the terminal is determined to be poor and is at the signal difference point position, and the reason that the terminal does not successfully access the cell is that the signal quality currently received by the terminal is poor, so that the coverage grade of the terminal at the signal difference point position can be directly upgraded. For example, the coverage level of the terminal 1 may be increased to the coverage level 2, so that the number of repeated accesses of the terminal is increased, thereby successfully accessing the cell.
S304, if the RSRP of the terminal is larger than or equal to the first preset threshold, whether the number of users initiating the access request in the cell in unit time is larger than or equal to the upper limit value of the channel capacity of the cell is determined.
Illustratively, the RSRP of the terminalUEIf the received signal quality of the terminal is higher than or equal to RSRP2, it is determined that the terminal is in the signal quality point position and the terminal in the signal quality point position is unsuccessfully accessed to the cell, and then it needs to be further determined whether the terminal is unsuccessfully accessed to the cell due to insufficient channel capacity caused by excessive number of users accessed to the current cell. For example, whether the channel capacity is insufficient may be determined by comparing the number of users initiating access requests per unit time with the size of the upper limit value of the channel capacity of the cell.
Illustratively, the channel capacity upper limit value is specifically:
Volumch＝Systemch(1+ β), wherein, VolumchFor the channel capacity upper limit, System, of a cellchIs the number of system sub-carriers, beta is the channel capacity proportionality coefficient, beta is more than or equal to 0 and less than or equal to 1.
Illustratively, the total bandwidth of the NB-IoT network may be 180KHz, and if the base station is on at 15KHz subcarrier spacing, the number of System subcarriers may be Systemch180/15-12; if the base station turns on 3.75KHz subcarrier spacing, then the number of System subcarriers may be Systemch180/3.75-48. The specific value of the number of system subcarriers is not limited in the embodiments of the present application, and is merely an exemplary illustration.
For example, the value of the channel capacity proportionality coefficient β may be any number from 0 to 1, and the specific value of the channel capacity proportionality coefficient β is not limited in this embodiment, and may be an empirical value.
For example, the number of users initiating an access request in a cell per unit time can be recorded as NumAccess_UEThe unit time may be 1S, if Num in 1SAccess_UE≥VolumchDetermining that the number of users accessing the current cell is too large to cause access congestion when the number of users initiating an access request in the current cell per unit time is larger than the upper limit value of the channel capacity; num in 1SAccess_UE＜VolumchAnd determining that the number of users accessing the current cell is smaller and does not cause access congestion when the number of users initiating the access request in the current cell per unit time is smaller than the upper limit value of the channel capacity.
S305, if the number of users initiating the access request in the cell in unit time is larger than or equal to the upper limit value of the channel capacity of the cell, the coverage grade of the terminal is not upgraded.
Exemplary, if Num within 1SAccess_UE≥VolumchAnd determining that the number of users accessed in the current cell is too large to cause access congestion when the number of users initiating the access request in the current cell per unit time is larger than the upper limit value of the channel capacity. It can be understood that the reason why the terminal unsuccessfully accesses the cell in this case is that the number of users accessed by the current cell is too large, so that the terminal unsuccessfully accesses the cell, at this time, the terminal may continuously request for access without performing coverage level upgrade on the terminal, and when the number of users in the cell is reduced, the terminal may successfully access the cell.
It should be noted that, in the prior art, when a large number of terminals access simultaneously at a position where the signal quality is good, if the access of a part of terminals fails due to insufficient channel capacity, the terminals still increase to the next coverage level to try to access, which results in a large number of times of service access repetition, and once the coverage level is upgraded, the number of times of data retransmission increases, which not only increases the service delay but also affects the access of subsequent services. In the access method of the embodiment of the application, when the terminal is not successfully accessed due to channel capacity congestion at the position of the good signal quality, the access can be continuously requested without upgrading the coverage level, and the terminal can be successfully accessed to the cell after the number of users in the cell is reduced, so that the time delay of service transmission is reduced compared with the prior art.
S306, if the number of users initiating the access request in the cell in unit time is smaller than the channel capacity upper limit value of the cell, determining whether the signal-to-noise ratio of the terminal is smaller than a second preset threshold value.
The second preset threshold is a difference value between a target receiving signal-to-noise ratio of the terminal and a target signal-to-noise ratio floating value;
exemplary, if Num within 1SAccess_UE＜VolumchAnd determining that the number of users accessed in the current cell is smaller and does not cause access congestion when the number of users initiating the access request in the current cell per unit time is smaller than the upper limit value of the channel capacity. However, the terminal which is located at the good signal position and has no channel congestion does not successfully access the cell, and then it needs to further determine whether the terminal has unsuccessfully accessed the cell because the signal-to-noise ratio of the terminal is too poor. For example, whether the signal-to-noise ratio of the terminal is too poor may be determined by comparing the signal-to-noise ratio of the terminal with a second preset threshold.
Illustratively, the Signal-to-Noise Ratio (SNR) of the terminal can be expressed as SNRUEThe target received signal-to-noise ratio of the terminal can be recorded as SNRDjThe target receiving SNR and the target signal-to-noise ratio floating value at the position j of the terminal are represented and can be recorded as delta SNR, and the second preset threshold is the SNRDj- Δ SNR. If SNRUE＜SNRDjΔ SNR, determines that the signal-to-noise ratio of the terminal is too poor.
And S307, if the signal-to-noise ratio of the terminal is smaller than a second preset threshold value, upgrading the coverage grade of the terminal.
Illustratively, the SNRUE＜SNRDjΔ SNR, determines that the signal-to-noise ratio of the terminal is too poor. It can be understood that the reason why the terminal does not successfully access the cell in this case is that the SNR of the current terminal is too poor, which results in the terminal failing to access the cell, and therefore the coverage level of the terminal needs to be upgraded. For example, the coverage level 1 terminal may be raised to the coverage level 2, so that the number of repeated accesses of the terminal is increased, thereby successfully accessing the cell.
According to the coverage grade upgrading method provided by the embodiment of the application, whether the Reference Signal Received Power (RSRP) of the terminal is smaller than a first preset threshold value or not is determined by acquiring the coverage grade i of the terminal; if the RSRP of the terminal is smaller than a first preset threshold value, upgrading the coverage grade of the terminal; if the RSRP of the terminal is greater than or equal to a first preset threshold, determining whether the number of users initiating access requests in a cell in unit time is greater than or equal to the upper limit value of the channel capacity of the cell; if the number of users initiating the access request in the cell in unit time is greater than or equal to the upper limit value of the channel capacity of the cell, the coverage grade of the terminal is not upgraded; if the number of users initiating access requests in a cell in unit time is smaller than the upper limit value of the channel capacity of the cell, determining whether the signal-to-noise ratio of a terminal is smaller than a second preset threshold value; and if the signal-to-noise ratio of the terminal is smaller than the second preset threshold value, upgrading the coverage grade of the terminal. According to the coverage grade i of the terminal, the Reference Signal Received Power (RSRP), the upper limit value of the channel capacity of the cell and the signal-to-noise ratio of the terminal, whether the coverage grade upgrading is carried out on the terminal or not is determined, and therefore the problem that the access rate of the user is low under a new coverage grade due to the fact that the user does not successfully carry out coverage grade jumping under the condition that the signal quality is good can be solved.
The embodiment of the present application further provides an overlay level upgrading apparatus, as shown in fig. 4, the overlay level upgrading apparatus 400 includes an obtaining unit 401 and a processing unit 402.
An obtaining unit 401 is configured to obtain a coverage level i, i is 0, 1, 2 of a terminal, where the terminal is a terminal in the coverage area of the cell, and the terminal does not successfully access the cell.
Illustratively, the coverage level i of the terminal may be coverage level 0, coverage level 1, or coverage level 2. In the embodiment of the present application, the coverage level of the terminal is not limited, and here, the coverage level of the terminal is only given as 1 for example. It can be understood that the terminal in the embodiment of the present application is a terminal that does not successfully access a cell within a coverage area of the cell.
A processing unit 402, configured to determine whether to upgrade a coverage level of the terminal according to a coverage level i of the terminal, reference signal received power RSRP, an upper limit value of channel capacity of the cell, and a signal-to-noise ratio of the terminal.
A processing unit 402, configured to determine whether an RSRP of the terminal is smaller than a first preset threshold; the first preset threshold is a boundary RSRP of the coverage level i and the coverage level i + 1.
The first preset threshold is a boundary RSRP of a coverage level i and a coverage level i + 1.
Illustratively, the RSRP boundary is an RSRP boundary that distinguishes different coverage levels, and the RSRP boundary is related to the coverage level of the terminal, for example, if the coverage level of the terminal is 0, the first preset threshold is the RSRP boundary that covers level 0 and level 1, and is denoted as RSRP 1; if the coverage level of the terminal is 1, the first preset threshold is a boundary RSRP of the coverage level 1 and the coverage level 2, which is recorded as RSRP 2.
Exemplary, RSRP of the terminal, which may be denoted as RSRPUEThe comparing the RSRP of the terminal with the first preset threshold may include: if the coverage grade of the terminal is 1, comparing the RSRP of the terminalUEAnd RSRP2 to determine whether the terminal is currently in a signal good point position or a signal bad point position. If RSRPUELess than RSRP2, it is determined that the terminal is currently in a signal difference location. If RSRPUEGreater than RSRP2, it is determined that the terminal is currently in a signal sweet spot position.
If the RSRP of the terminal is smaller than the first preset threshold, the processing unit 402 is further configured to upgrade the coverage level of the terminal.
Illustratively, the RSRP of the terminalUELess than RSRP2, processing unit 402 determines that the received signal quality of the terminal is poor and is in a signal difference position, and the reason that the terminal does not successfully access the cell is that the signal quality currently received by the terminal is poor, so that coverage level upgrade can be directly performed on the terminal in the signal difference position. For example, the coverage level of the terminal 1 may be increased to the coverage level 2, so that the number of repeated accesses of the terminal is increased, thereby successfully accessing the cell.
If the RSRP of the terminal is greater than or equal to the first preset threshold, the processing unit 402 is further configured to determine whether the number of users initiating an access request in the cell in a unit time is greater than or equal to an upper limit value of the channel capacity of the cell.
Illustratively, the RSRP of the terminalUEGreater than or equal to RSRP2, processing unit 402 determines that the received signal quality of the terminal is better, is in the signal quality point position, and is in the signal quality point positionIf the terminal at the position does not successfully access the cell, it needs to further determine whether the terminal has not successfully accessed the cell due to insufficient channel capacity caused by excessive number of users accessed by the current cell. For example, whether the channel capacity is insufficient may be determined by comparing the number of users initiating access requests per unit time with the size of the upper limit value of the channel capacity of the cell.
Illustratively, the channel capacity upper limit value is specifically:
Volumch＝Systemch(1+ β), wherein, VolumchFor the channel capacity upper limit, System, of a cellchIs the number of system sub-carriers, beta is the channel capacity proportionality coefficient, beta is more than or equal to 0 and less than or equal to 1.
Illustratively, the total bandwidth of the NB-IoT network may be 180KHz, and if the base station is on at 15KHz subcarrier spacing, the number of System subcarriers may be Systemch180/15-12; if the base station turns on 3.75KHz subcarrier spacing, then the number of System subcarriers may be Systemch180/3.75-48. The specific value of the number of system subcarriers is not limited in the embodiments of the present application, and is merely an exemplary illustration.
For example, the value of the channel capacity proportionality coefficient β may be any number from 0 to 1, and the specific value of the channel capacity proportionality coefficient β is not limited in this embodiment, and may be an empirical value.
For example, the number of users initiating an access request in a cell per unit time can be recorded as NumAccess_UEThe unit time may be 1S, if Num in 1SAccess_UE≥VolumchDetermining that the number of users accessing the current cell is too large to cause access congestion when the number of users initiating an access request in the current cell per unit time is larger than the upper limit value of the channel capacity; num in 1SAccess_UE＜VolumchAnd determining that the number of users accessing the current cell is smaller and does not cause access congestion when the number of users initiating the access request in the current cell per unit time is smaller than the upper limit value of the channel capacity.
If the number of users initiating access requests in the cell in a unit time is greater than or equal to the upper limit of the channel capacity of the cell, the processing unit 402 does not upgrade the coverage level of the terminal.
Exemplary, if Num within 1SAccess_UE≥VolumchAnd determining that the number of users accessed in the current cell is too large to cause access congestion when the number of users initiating the access request in the current cell per unit time is larger than the upper limit value of the channel capacity. It can be understood that the reason why the terminal unsuccessfully accesses the cell in this case is that the number of users accessed by the current cell is too large, so that the terminal unsuccessfully accesses the cell, at this time, the terminal may continuously request for access without performing coverage level upgrade on the terminal, and when the number of users in the cell is reduced, the terminal may successfully access the cell.
It should be noted that, in the prior art, when a large number of terminals access simultaneously at a position where the signal quality is good, if the access of a part of terminals fails due to insufficient channel capacity, the terminals still increase to the next coverage level to try to access, which results in a large number of times of service access repetition, and once the coverage level is upgraded, the number of times of data retransmission increases, which not only increases the service delay but also affects the access of subsequent services. In the access method of the embodiment of the application, when the terminal is not successfully accessed due to channel capacity congestion at the position of the good signal quality, the access can be continuously requested without upgrading the coverage level, and the terminal can be successfully accessed to the cell after the number of users in the cell is reduced, so that the time delay of service transmission is reduced compared with the prior art.
If the number of users initiating access requests in the cell in a unit time is smaller than the upper limit value of the channel capacity of the cell, the processing unit 402 is further configured to determine whether the signal-to-noise ratio of the terminal is smaller than a second preset threshold; the second preset threshold is a difference value between a target receiving signal-to-noise ratio of the terminal and a target signal-to-noise ratio floating value.
Exemplary, if Num within 1SAccess_UE＜VolumchAnd determining that the number of users accessed in the current cell is smaller and does not cause access congestion when the number of users initiating the access request in the current cell per unit time is smaller than the upper limit value of the channel capacity. And should be in a signal good spot positionA terminal with no channel congestion does not successfully access the cell, and then a further determination is made as to whether the terminal has unsuccessfully accessed the cell due to a poor signal-to-noise ratio of the terminal. For example, whether the signal-to-noise ratio of the terminal is too poor may be determined by comparing the signal-to-noise ratio of the terminal with a second preset threshold.
Illustratively, the Signal-to-Noise Ratio (SNR) of the terminal can be expressed as SNRUEThe target received signal-to-noise ratio of the terminal can be recorded as SNRDjThe target receiving SNR and the target signal-to-noise ratio floating value at the position j of the terminal are represented and can be recorded as delta SNR, and the second preset threshold is the SNRDj- Δ SNR. If SNRUE＜SNRDjΔ SNR, determines that the signal-to-noise ratio of the terminal is too poor.
If the signal-to-noise ratio of the terminal is smaller than the second preset threshold, the processing unit 402 is further configured to upgrade the coverage level of the terminal, and upgrade the coverage level i of the terminal to a coverage level i + 1.
Illustratively, the SNRUE＜SNRDjΔ SNR, determines that the signal-to-noise ratio of the terminal is too poor. It can be understood that the reason why the terminal does not successfully access the cell in this case is that the SNR of the current terminal is too poor, which results in the terminal failing to access the cell, and therefore the coverage level of the terminal needs to be upgraded. For example, the coverage level 1 terminal may be raised to the coverage level 2, so that the number of repeated accesses of the terminal is increased, thereby successfully accessing the cell.
According to the coverage grade upgrading device provided by the embodiment of the application, the coverage grade i of the terminal is obtained through the obtaining unit, and the processing unit is used for determining whether the Reference Signal Received Power (RSRP) of the terminal is smaller than a first preset threshold value or not; if the RSRP of the terminal is smaller than a first preset threshold value, upgrading the coverage grade of the terminal; if the RSRP of the terminal is greater than or equal to a first preset threshold, determining whether the number of users initiating access requests in a cell in unit time is greater than or equal to the upper limit value of the channel capacity of the cell; if the number of users initiating the access request in the cell in unit time is greater than or equal to the upper limit value of the channel capacity of the cell, the coverage grade of the terminal is not upgraded; if the number of users initiating access requests in a cell in unit time is smaller than the upper limit value of the channel capacity of the cell, determining whether the signal-to-noise ratio of a terminal is smaller than a second preset threshold value; and if the signal-to-noise ratio of the terminal is smaller than the second preset threshold value, upgrading the coverage grade of the terminal. According to the embodiment of the application, whether the coverage grade of the terminal is upgraded or not is determined according to the coverage grade i of the terminal, the Reference Signal Received Power (RSRP), the upper limit value of the channel capacity of the cell and the signal-to-noise ratio of the terminal, so that the problem that the access rate of a user is low under a new coverage grade due to the fact that the user does not successfully access and performs coverage grade jump under the condition of good signal quality can be solved.
In the case of an integrated unit, fig. 5 shows a schematic diagram of a possible structure of the coverage level upgrading device according to the above embodiment. The coverage level upgrade apparatus 500 includes: a storage module 501 and a processing module 502. The processing module 502 is used to control and manage the actions of the coverage level upgrade apparatus, e.g., the processing module 502 is used to support the coverage level upgrade apparatus 500 to perform S301-S307 in FIG. 3, and/or other processes for the techniques described herein. The storage module 501 is used for storing program codes and data of the computer. When the storage module 501 is a memory, the processing module 502 can be a processor.
Embodiments of the present application further provide a computer-readable storage medium, where one or more programs are stored in the computer-readable storage medium, where the one or more programs include instructions, and when the processor of the coverage level upgrade apparatus executes the instructions, the coverage level upgrade apparatus executes the steps in the method flow shown in the above method embodiments.
The steps of a method or algorithm described in connection with the disclosure herein may be embodied in hardware or in software instructions executed by a processor. The software instructions may be embodied in respective software modules that may be stored in Random Access Memory (RAM), flash Memory, Erasable Programmable read-only Memory (EPROM), Electrically Erasable Programmable read-only Memory (EEPROM), registers, a hard disk, a removable disk, a compact disc read-only Memory (CD-ROM), or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. Additionally, the ASIC may reside in a core network interface device. Of course, the processor and the storage medium may reside as discrete components in a core network interface device.
Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in this disclosure may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the scope of the present invention, and any modification, equivalent replacement, improvement, etc. made on the basis of the technical solutions of the present invention should be included in the scope of the present invention.

Claims (7)

1. A method for coverage level upgrade, the method comprising:
acquiring a coverage grade i, i being 0, 1, 2 of a terminal, wherein the terminal is a terminal in a cell coverage range and the terminal does not successfully access the cell;
acquiring Reference Signal Received Power (RSRP) of the terminal and an upper limit value of channel capacity of the cell;
determining whether the RSRP of the terminal is smaller than a first preset threshold value; the first preset threshold is a boundary RSRP of the coverage level i and a coverage level i + 1;
if the RSRP of the terminal is smaller than the first preset threshold, upgrading the coverage grade of the terminal;
if the RSRP of the terminal is greater than or equal to the first preset threshold, determining whether the number of users initiating access requests in the cell in unit time is greater than or equal to the upper limit value of the channel capacity of the cell;
if the number of users initiating access requests in the cell in unit time is greater than or equal to the upper limit value of the channel capacity of the cell, the coverage grade of the terminal is not upgraded;
if the number of users initiating access requests in the cell in unit time is smaller than the upper limit value of the channel capacity of the cell, determining whether the signal-to-noise ratio of the terminal is smaller than a second preset threshold value; the second preset threshold is the difference value between the target receiving signal-to-noise ratio of the terminal and the target signal-to-noise ratio floating value;
and if the signal-to-noise ratio of the terminal is smaller than the second preset threshold value, upgrading the coverage grade of the terminal.
2. The coverage level upgrade method according to claim 1, wherein the coverage level upgrade is performed on the terminal to upgrade a coverage level i of the terminal to a coverage level i + 1.
3. The coverage level upgrading method according to claim 2, wherein the channel capacity upper limit value of the cell is specifically:
Volumch＝Systemch(1+ β), wherein, VolumchFor the channel capacity upper limit value of the cell, SystemchIs the number of system sub-carriers, beta is the channel capacity proportionality coefficient, beta is more than or equal to 0 and less than or equal to 1.
4. An overlay level upgrade apparatus, the apparatus comprising:
an obtaining unit, configured to obtain a coverage level i, i being 0, 1, 2 of a terminal, where the terminal is a terminal in a cell coverage area and the terminal does not successfully access the cell;
the processing unit is used for determining whether to upgrade the coverage grade of the terminal according to the coverage grade i of the terminal, Reference Signal Received Power (RSRP) and the upper limit value of the channel capacity of the cell; specifically, the RSRP determining unit is configured to determine whether RSRP of the terminal is smaller than a first preset threshold; the first preset threshold is a boundary RSRP of the coverage level i and a coverage level i + 1; if the RSRP of the terminal is smaller than the first preset threshold, the processing unit is further used for upgrading the coverage grade of the terminal; if the RSRP of the terminal is greater than or equal to the first preset threshold, the processing unit is further configured to determine whether the number of users initiating an access request in the cell in unit time is greater than or equal to an upper limit value of channel capacity of the cell; if the number of users initiating access requests in the cell in unit time is greater than or equal to the upper limit value of the channel capacity of the cell, the processing unit does not upgrade the coverage grade of the terminal; if the number of users initiating access requests in the cell in unit time is smaller than the upper limit value of the channel capacity of the cell, the processing unit is further configured to determine whether the signal-to-noise ratio of the terminal is smaller than a second preset threshold; the second preset threshold is the difference value between the target receiving signal-to-noise ratio of the terminal and the target signal-to-noise ratio floating value; and if the signal-to-noise ratio of the terminal is smaller than the second preset threshold, the processing unit is further used for upgrading the coverage grade of the terminal.
5. The coverage level upgrade apparatus according to claim 4, wherein the coverage level upgrade is performed on the terminal to upgrade a coverage level i of the terminal to a coverage level i + 1.
6. The coverage level upgrading apparatus according to claim 5, wherein the channel capacity upper limit value of the cell is specifically:
Volumch＝Systemch*(1+β)wherein, VolumchFor the channel capacity upper limit value of the cell, SystemchIs the number of system sub-carriers, beta is the channel capacity proportionality coefficient, beta is more than or equal to 0 and less than or equal to 1.
7. A computer storage medium having computer program code stored therein, which when run on a processor causes the processor to perform a coverage level upgrade method according to any one of claims 1-3.
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