CN109121196B - Terminal transmitting power control method and device based on NB-IoT system - Google Patents

Terminal transmitting power control method and device based on NB-IoT system Download PDF

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CN109121196B
CN109121196B CN201811150946.0A CN201811150946A CN109121196B CN 109121196 B CN109121196 B CN 109121196B CN 201811150946 A CN201811150946 A CN 201811150946A CN 109121196 B CN109121196 B CN 109121196B
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terminal
preamble
signal receiving
receiving level
coverage enhancement
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CN109121196A (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
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/283—Power depending on the position of the mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/325—Power control of control or pilot channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/362—Aspects of the step size

Abstract

The embodiment of the invention discloses a terminal transmitting power control method and device based on an NB-IoT system, relates to the technical field of communication, and aims to solve the technical problem that in the prior art, the uplink interference of the NB-IoT system is too high due to the fact that the terminal transmitting power is raised too high. The method comprises the following steps: judging whether the first terminal upgrades the coverage enhancement grade; if the judgment result is yes, acquiring the number of terminals of the second terminal which are within a preset distance range from the first terminal and meet the signal receiving level condition; determining lead code power offset of the first terminal according to the number of the terminals; and determining the transmission power of the first terminal according to the preamble power offset. The invention is used for reducing the uplink interference of the NB-IoT system and effectively inhibiting the lifting of the base station noise.

Description

Terminal transmitting power control method and device based on NB-IoT system
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a terminal transmitting power control method and device based on an NB-IoT system.
Background
NB-IoT (Narrow Band Internet of Things) is an Internet of Things technology based on 3GPP LTE standard protocol evolution, has the advantages of high spectrum resource utilization rate, support of a large number of medium-low speed users, deep coverage, reduction of terminal power consumption and the like, and is mainly oriented to the application scenes of the Internet of Things with medium-low speed, deep coverage, low power consumption and large connection.
The network architecture of the NB-IoT system is shown in fig. 1a, and includes: a terminal (e.g., user equipment, UE), a base station (eNodeB), a packet core network (EPC), an IoT platform (connection management platform), and an application server of the NB-IoT system. Currently, the NB-IoT system supports three types of CEL (Coverage enhancement Level), see fig. 1b, CEL0(MCL (Minimum Coupling Loss) is 144dB), CEL1(MCL is 154dB), and CEL2(MCL is 164 dB). Among them, the order of CEL0, CEL1, and CEL2 from high to low in the ranks is: CEL2 > CEL1 > CEL 0.
In practical situations, when the coverage enhancement level of the terminal of the NB-IoT system is at CEL1 and CEL2, the terminal employs the maximum transmission power, which results in higher uplink interference in the NB-IoT system and severe base station noise rise.
Disclosure of Invention
The embodiment of the invention provides a terminal transmission power control method and device based on an NB-IoT system, which are used for solving the technical problem that the uplink interference of the NB-IoT system is too high due to the fact that the terminal transmission power is raised too high in the prior art.
In a first aspect, a terminal transmission power control method based on an NB-IoT system is provided, including:
judging whether the first terminal upgrades the coverage enhancement grade;
if the judgment result is yes, acquiring the number of terminals of the second terminal which are within a preset distance range from the first terminal and meet the signal receiving level condition;
determining lead code power offset of the first terminal according to the number of the terminals;
and determining the transmission power of the first terminal according to the preamble power offset and the path loss of the first terminal.
Therefore, when the coverage enhancement level of the first terminal is upgraded to CEL1 or CEL2, the preamble power offset of the first terminal can be flexibly determined according to the number of terminals of the second terminal interfered by the first terminal within the preset distance range of the first terminal, and the transmission power of the first terminal can be flexibly determined according to the preamble power offset and the path loss of the first terminal. The number of the terminals of the second terminal can affect the system resource occupancy rate of the NB-IoT system and the signal quality of the second terminal under the current coverage enhancement level, so that the transmission power of the first terminal can be matched with the system resource occupancy rate of the NB-IoT system and the transmission power of the first terminal can be matched with the signal quality of the second terminal by determining the preamble code power offset of the first terminal according to the number of the terminals of the second terminal; meanwhile, the path loss from the base station to the first terminal is introduced to realize the matching between the transmitting power of the first terminal and the path loss from the base station to the first terminal, so that the first terminal does not fixedly adopt the maximum transmitting power any more, thereby effectively reducing the uplink interference of the NB-IoT system and effectively inhibiting the lifting of the base noise of the base station.
Optionally, the signal reception level condition is specifically:
the signal receiving level of the terminal is in a signal receiving level floating threshold interval corresponding to the first terminal;
the specific steps of acquiring the number of the second terminals which are within the preset distance range from the first terminal and meet the signal receiving level condition are as follows:
determining a third terminal within a preset distance range from the first terminal;
judging whether the signal receiving level of the third terminal is within a signal receiving level floating threshold interval corresponding to the first terminal;
and if the judgment result is yes, adding 1 to the terminal number count of the second terminal.
Optionally, the determining the preamble power offset of the first terminal according to the number of terminals specifically includes:
the preamble power offset is calculated using the following equation: DELTA _ PREAMBLE ═ Δ {1+ min [10(NUM _ RSRP/step)%, 1] };
wherein DELTA _ PREAMBLE is a PREAMBLE power offset; delta is a preset target signal receiving level floating value; NUM _ RSRP is the number of the second terminals; step is the step value.
Optionally, determining the transmit power of the first terminal according to the preamble power offset and the first terminal path loss specifically includes:
calculating the transmission power of the first terminal by adopting the following formula:
PNPRACH＝min{PCMAX-N，C(a)，NPRTP+PLc}dBm；
wherein, PNPRACHIs the transmit power of the first terminal; pCMAX-N，C(a)A terminal maximum transmit power configured at subframe a for the NB-IoT system for serving cell C; NPRTP is narrowband reference signal received power; the PLc is the path loss from the base station to the first terminal;
wherein plcc RSRP _ UE _ CELi-RS;
RSRP _ UE _ CELi is the signal reception level of the first terminal at the ith coverage enhancement level CELi; RS is a reference level of the power of the transmitted signal of the base station; wherein i is an integer, and i is more than or equal to 0 and less than or equal to 1;
NPRTP＝Preamble_IRTP+DELTA_PREAMBLE+(Preamble_TC-1)*PR_Step-10*1g(numRPPA)；
preamble _ IRTP is Preamble initial target received power, DELTA _ Preamble is Preamble power offset; preamble _ TC is the access frequency of the first terminal; PR _ Step is a power increment Step; numRPPA is the number of preamble retransmissions.
Optionally, the determining whether the first terminal performs the upgrade of the coverage enhancement level includes:
acquiring the number of times of trying to access the lead code of the first terminal and the maximum number of times of trying to access the lead code of the current coverage enhancement level of the first terminal;
judging whether the number of times of trying to access the lead code is equal to the maximum number of times of trying to access the lead code;
if the judgment result is yes, further acquiring a signal receiving level value of a critical point of the current coverage enhancement grade and the next coverage enhancement grade of the first terminal and a preset signal receiving level floating value;
acquiring a difference value between the signal receiving level value and a preset signal receiving level floating value;
judging whether the terminal signal receiving level of the first terminal is less than or equal to the difference value;
and if so, judging that the first terminal upgrades the coverage enhancement level.
In a second aspect, an NB-IoT system-based terminal transmission power control apparatus is provided, including:
the judging and processing module is used for judging whether the first terminal upgrades the coverage enhancement grade;
the acquisition module is used for acquiring the number of the terminals of the second terminal which are within a preset distance range from the first terminal and meet the signal receiving level condition if the judgment result of the judgment processing module is positive;
the first determining module is used for determining the lead code power offset of the first terminal according to the number of the terminals acquired by the acquiring module;
and the second determining module is used for determining the transmitting power of the first terminal according to the preamble code power offset determined by the first determining module and the path loss of the first terminal.
Optionally, the signal reception level condition is specifically:
the signal receiving level of the terminal is in a signal receiving level floating threshold interval corresponding to the first terminal;
the obtaining module is specifically configured to:
determining a third terminal within a preset distance range from the first terminal;
judging whether the signal receiving level of the third terminal is within a signal receiving level floating threshold interval corresponding to the first terminal;
and if the judgment result is yes, adding 1 to the terminal number count of the second terminal.
Optionally, the first determining module is specifically configured to:
the preamble power offset is calculated using the following equation: DELTA _ PREAMBLE ═ Δ {1+ min [10(NUM _ RSRP/step)%, 1] };
wherein DELTA _ PREAMBLE is a PREAMBLE power offset; delta is a preset target signal receiving level floating value; NUM _ RSRP is the number of the second terminals; step is the step value.
Optionally, the second determining module is specifically configured to:
calculating the transmission power of the first terminal by adopting the following formula:
PNPRACH＝min{PCMAX-N，C(a)，NPRTP+PLc}dBm；
wherein, PNPRACHIs the transmit power of the first terminal; pCMAX-N，C(a)A terminal maximum transmit power configured at subframe a for the NB-IoT system for serving cell C; NPRTP is narrowband reference signal received power; the PLc is the path loss from the base station to the first terminal;
wherein plcc RSRP _ UE _ CELi-RS;
RSRP _ UE _ CELi is the signal reception level of the first terminal at the ith coverage enhancement level CELi; RS is a reference level of the power of the transmitted signal of the base station; wherein i is an integer, and i is more than or equal to 0 and less than or equal to 1;
NPRTP＝Preamble_IRTP+DELTA_PREAMBLE+(Preamble_TC-1)*PR_Step-10*1g(numRPPA)；
preamble _ IRTP is Preamble initial target received power, DELTA _ Preamble is Preamble power offset; preamble _ TC is the access frequency of the first terminal; PR _ Step is a power increment Step; numRPPA is the number of preamble retransmissions.
Optionally, the judgment processing module is specifically configured to:
acquiring the number of times of trying to access the lead code of the first terminal and the maximum number of times of trying to access the lead code of the current coverage enhancement level of the first terminal;
judging whether the number of times of trying to access the lead code is equal to the maximum number of times of trying to access the lead code;
if the judgment result is yes, further acquiring a signal receiving level value of a critical point of the current coverage enhancement grade and the next coverage enhancement grade of the first terminal and a preset signal receiving level floating value;
acquiring a difference value between the signal receiving level value and a preset signal receiving level floating value;
judging whether the terminal signal receiving level of the first terminal is less than or equal to the difference value;
and if so, judging that the first terminal upgrades the coverage enhancement level.
In a third aspect, an NB-IoT system-based terminal transmission power control apparatus is provided, including: one or more processors; the processor is configured to execute computer program code in the memory, the computer program code comprising instructions for the NB-IoT system based terminal transmit power control apparatus to perform the NB-IoT system based terminal transmit power control method as described above.
In a fourth aspect, there is provided a storage medium comprising: the storage medium stores instruction codes for performing the NB-IoT system-based terminal transmission power control method as described above.
In a fifth aspect, a computer product is provided, comprising: the computer program product includes instruction codes for performing the NB-IoT system-based terminal transmission power control method described above.
It can be understood that, the terminal transmission power control apparatus, the storage medium, and the computer product based on the NB-IoT system provided above are configured to perform the method corresponding to the first aspect provided above, and therefore, the beneficial effects that can be achieved by the terminal transmission power control apparatus, the storage medium, and the computer product can refer to the method of the first aspect above and the beneficial effects of the corresponding schemes in the following detailed description, which are not described herein again.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and the drawings are only for the purpose of illustrating preferred embodiments and are not to be considered as limiting the present invention.
Fig. 1a shows a network architecture diagram of an NB-IoT system;
fig. 1b shows a schematic distribution diagram of coverage enhancement tiers supported by an NB-IoT system;
fig. 2 is a flowchart illustrating a terminal transmission power control method based on an NB-IoT system according to the present invention;
fig. 3 is a flowchart illustrating a terminal transmission power control method based on an NB-IoT system according to the present invention;
FIG. 4 is a schematic diagram illustrating a preset distance range of a first terminal in the present invention;
fig. 5 is a flowchart illustrating a terminal transmission power control method based on an NB-IoT system according to the present invention;
fig. 6 shows a functional block diagram of a terminal transmission power control device based on an NB-IoT system provided in the present invention;
fig. 7 shows a functional block diagram of a terminal transmission power control device based on an NB-IoT system provided in the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The use of the terms first, second, etc. do not denote any order, and the terms first, second, etc. may be interpreted as names of the objects described. In the embodiments of the present invention, words such as "exemplary" or "for example" are used to mean serving as examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "e.g.," an embodiment of the present invention 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.
Before introducing the present invention, first, a brief introduction is made to the setting of coverage enhancement levels in the current NB-IoT system and the control strategy of the terminal transmission power under different coverage enhancement levels.
Specifically, CEL0, CEL1, and CEL2 may be defined as follows: the coverage enhancement level of the terminal in the area range with Reference Signal Receiving Power (Reference Signal Receiving Power) less than 144dB (decibel) is CEL0 with the base station eNodeB as the center; the level of coverage enhancement for terminals with RSRP less than 154dB is CEL1 and the level of coverage enhancement for terminals with RSRP less than 164dB is CEL 2.
The NB-IoT Uplink Channel includes two Physical channels, one is NPUSCH (Narrowband Physical Uplink Shared Channel) and the other is NPRACH (Narrowband Physical random access Channel). The NPRACH is an access channel when the terminal starts to initiate a call. For different coverage enhancement levels, the NPRACH can set different information repetition times to realize coverage enhancement; the higher the coverage enhancement level is, the more the information repetition times correspondingly set by the NPRACH is. Meanwhile, the base station side sets the maximum number of access attempts.
Based on the above rules, under a certain coverage enhancement level CELi (i is an integer, and i is greater than or equal to 0 and less than or equal to 1), the access attempt process of the terminal requesting access to the base station is as follows: in NPRACH, the terminal tries to access the base station every time by the information repetition number corresponding to the CELi, and when the number of times that the terminal tries to access the base station side is equal to the maximum number of attempted accesses set by the base station side, if the terminal has not successfully accessed the base station at this time, the terminal will upgrade from the current coverage enhancement level to a higher level, and try to access the base station in the same attempted access process as described above. After the coverage enhancement level is upgraded, the information repetition times are correspondingly increased, so that the probability of successfully accessing the base station by the terminal can be effectively increased. At present, when the coverage enhancement level of a terminal is CEL0, the terminal usually adopts a PRACH power mapping mechanism for power control, and the actual path loss between the terminal and a base station is added as a factor influencing the power during the power control; however, the terminal employs the maximum transmission power in both CEL1 and CEL2, which results in that the terminal in the NB-IoT system will generate higher uplink interference after performing coverage enhancement level upgrade, and the base station noise rise is severe, and the above problem is substantially caused by the mismatch between the terminal transmission power and the actual path loss from the base station to the terminal when the coverage enhancement level of the terminal is CEL1 or CEL 2.
Based on the existing problems, the present invention provides a terminal transmission power control method based on NB-IoT system, as shown in fig. 2, the method includes the following steps:
step S210: and judging whether the first terminal upgrades the coverage enhancement grade.
The first terminal, that is, an NB-IoT terminal in the NB-IoT system, may specifically be a user equipment UE, and includes: mobile devices such as a mobile phone and a tablet computer, and a USIM (Universal Subscriber Identity Module).
Specifically, in this step, if the determination result is negative, the first terminal does not perform the upgrade of the coverage enhancement level, and step S220 is executed.
If the determination result is yes, that is, the first terminal performs the upgrade of the coverage enhancement level, step S230 is executed. Since the NB-IoT supports three coverage enhancement levels, namely CEL0, CEL1, and CEL2, the above upgrading of the coverage enhancement levels may be: if the current coverage enhancement level of the first terminal is CEL0, upgrading the first terminal from CEL0 to CEL 1; alternatively, if the current coverage enhancement level of the first terminal is CEL1, the first terminal is upgraded from CEL1 to CEL 2.
In a specific implementation, there may be multiple ways of determining whether the first terminal performs the upgrade of the coverage enhancement level, and a preferred way is described below, as shown in fig. 3, including:
step S310: and acquiring the number of times of the attempted access of the lead code of the first terminal and the maximum number of times of the attempted access of the lead code of the current coverage enhancement level of the first terminal.
The number of times of Preamble Attempt access (Num Preamble Attempt CE), that is, the number of times of the first terminal attempting access to the base station side based on the Preamble under the current coverage level.
The maximum number of Preamble attempts (max Num Preamble Attempt CE), which is the maximum number of attempts the base station side allows the first terminal to Attempt to access the base station side. In a specific implementation, in the NB-IoT system, for three coverage enhancement classes CEL0, CEL1, and CEL2, each coverage enhancement class is configured with a resource configuration parameter corresponding thereto, and a Preamble maximum number of attempted accesses (max Num Preamble Attempt CE) is included in the resource configuration parameters.
Step S320: judging whether the number of times of trying to access the lead code is equal to the maximum number of times of trying to access the lead code; if the determination result is negative, step S230 is executed. If yes, go to step S330;
step S330: and acquiring the signal receiving level values of the current coverage enhancement grade and the next coverage enhancement grade critical point of the first terminal and a preset signal receiving level floating value.
And the next coverage enhancement grade is the corresponding coverage enhancement grade after the current coverage enhancement grade is increased by one grade. Specifically, if the current coverage enhancement level is CEL, the next coverage enhancement level is CEL (i + 1).
The preset signal reception level floating value can be set by those skilled in the art according to practical situations, and the present invention is not limited thereto. In a specific implementation, the preset signal receiving level floating value is preferably 3.
Step S340: and acquiring the difference value between the signal receiving level value and a preset signal receiving level floating value.
Wherein, the higher the coverage enhancement level of the terminal is, the smaller the signal reception level of the terminal is. In a specific implementation, the difference may reflect a maximum value of a signal reception level corresponding to the upgrade of the coverage enhancement level performed by the first terminal.
Step S350: and judging whether the terminal signal receiving level of the first terminal is less than or equal to the difference value, if so, upgrading the coverage enhancement level of the first terminal, and executing the step S230, otherwise, executing the step S220.
Here, it is to be noted that the above-mentioned manner of determining whether the first terminal performs the upgrade of the coverage enhancement level is only a preferred manner, and in a specific implementation, the present invention may also implement the determination process in step S210 in other manners besides the above-mentioned manner, for example, only step S310 to step S320 may be performed, step S230 is performed when the determination result in step S320 is yes, step S220 is performed when the determination result in step S320 is no, and so on.
Step S220: the first terminal continuously tries to access the base station according to the current coverage enhancement level and executes the process of the method again.
The procedure of attempting to access the base station is the same as the above-described procedure of attempting to access the base station requested by the terminal, and reference is specifically made to the above corresponding description, which is not described herein again.
Step S230: and acquiring the number of terminals of the second terminal which are within a preset distance range from the first terminal and meet the signal receiving level condition.
As shown in fig. 4, if the preset distance is R, the specific range of the preset distance may be: and taking the first terminal as a center and R as an area range corresponding to the radius. The preset distance R may be set by a person skilled in the art according to actual situations, and the present invention is not limited thereto.
The signal reception level condition may specifically be: the signal receiving level of the terminal is within the signal receiving level floating threshold interval corresponding to the first terminal. Specifically, in the NB-IoT system, each coverage enhancement level includes a plurality of terminals, and if the first terminal is the kth terminal in the coverage enhancement level after the first terminal is upgraded, the signal reception level floating threshold interval corresponding to the first terminal is [ RSRP _ Th [ ]k-1，RSRP_Thk+1]. Wherein, RSRP _ Thk-1Is the RSRP floating threshold upper limit, RSRP _ Th, of the first terminalk+1And the RSRP floating threshold lower limit of the first terminal is obtained.
That is, in this step, the statistical signal reception level may be [ RSRP _ Th ] for each terminal within a preset distance R from the first terminalk-1，RSRP_Thk+1]And taking the number of the terminals in the interval range as the number of the terminals of the second terminal. In one implementation, the signal quality of the second terminal may be affected by the transmit power of the first terminal.
It is understood that the above-mentioned signal reception level condition is only one preferred condition, and in a specific implementation, the signal reception level condition may be set by a person skilled in the art as another way other than the above-mentioned way according to actual situations, as long as the second terminal whose signal quality is affected by the transmission power of the first terminal within a preset distance range from the first terminal can be screened out.
In a preferred mode, the execution process of this step can be as shown in fig. 5, and includes:
step S510: and determining a third terminal within a preset distance range from the first terminal.
The preset distance range is referred to the corresponding description in step S230, and is not described herein again.
Step S520: and judging whether the signal receiving level of the third terminal is within the signal receiving level floating threshold interval corresponding to the first terminal.
If the determination result is no, step S530 is executed, and if the determination result is yes, step S540 is executed.
Step S530: the number of terminals of the second terminal is not counted.
Step S540: the terminal number count of the second terminal is incremented by 1.
Step S240: and determining the preamble power offset of the first terminal according to the number of the terminals.
When the number of the terminals of the second terminal is large, each second terminal occupies the resource of the NB-IoT system, and the system resource occupancy rate of the NB-IoT system is high at the moment; meanwhile, when the number of the terminals of the second terminal is large, the number of the terminals interfered by the first terminal is correspondingly increased (the transmission power of the first terminal is too large, so that the interference is generated to the large number of the second terminals, and the signal quality of the second terminals is poor); according to the influence of the number of the second terminals on the system resource occupancy rate of the NB-IoT system and the interference of the second terminals by the first terminal, the following formula is preferably adopted to calculate the preamble power offset in this step:
DELTA_PREAMBLE＝△*{1+min[10(NUM_RSRP/step)％，1]}；
wherein DELTA _ PREAMBLE is a PREAMBLE power offset; the Δ is a preset target signal receiving level floating value, and in a specific implementation, the Δ may be set by a person skilled in the art according to an actual situation, which is not limited by the present invention; NUM _ RSRP is the number of terminals of the second terminal acquired in step S230; step is the step value set for the NB-IoT system.
Step S250: and determining the transmission power of the first terminal according to the preamble power offset and the path loss of the first terminal.
Specifically, in this step, the following formula is preferably adopted to calculate the transmission power of the first terminal:
PNPRACH＝min{PCMAX-N，C(a)，NPRTP+PLc}dBm；
wherein, PNPRACHIs the transmit power of the first terminal; pCMAX-N，C(a)A terminal maximum transmit power configured at subframe a for the NB-IoT system for serving cell C; NPRTP (narrow band _ PREAMBLE _ RECEIVED _ TARGET _ POWER) is the narrow-band reference signal RECEIVED POWER; PLc is the first terminal path loss, i.e.: path loss from the base station to the first terminal. PNPRACHThe unit of (A) is: dBm (decibel milliwatts).
Wherein, the PLc may be calculated as follows:
PLc＝RSRP_UE_CELi-RS；
wherein RSRP _ UE _ CELi is a signal reception level of the first terminal at the ith coverage enhancement level CELi; RS is the base station transmit signal power reference level. Wherein i is an integer, and i is more than or equal to 0 and less than or equal to 1.
NPRTP＝Preamble_IRTP+DELTA_PREAMBLE+(Preamble_TC-1)*PR_Step-10*1g(numRPPA)；
Preamble _ irtp (Preamble Initial Received Target power) is Preamble Initial Target Received power, and DELTA _ Preamble is Preamble power offset; preamble _ TC (Preamble _ Transmission _ Counter) is the number of times of access of the first terminal; PR _ Step is a power increment Step; numrppa (num Repetition preamble at) is the number of preamble retransmissions.
Therefore, when the coverage enhancement level of the first terminal is upgraded to CEL1 or CEL2, the preamble power offset of the first terminal can be flexibly determined according to the number of terminals of the second terminal interfered by the first terminal within the preset distance range of the first terminal, and the transmission power of the first terminal can be flexibly determined according to the preamble power offset and the path loss of the first terminal. The number of the terminals of the second terminal can affect the system resource occupancy rate of the NB-IoT system and the signal quality of the second terminal under the current coverage enhancement level, so that the transmission power of the first terminal can be matched with the system resource occupancy rate of the NB-IoT system and the transmission power of the first terminal can be matched with the signal quality of the second terminal by determining the preamble code power offset of the first terminal according to the number of the terminals of the second terminal; meanwhile, the path loss from the base station to the first terminal is introduced to realize the matching between the transmitting power of the first terminal and the path loss from the base station to the first terminal, so that the first terminal does not fixedly adopt the maximum transmitting power any more, thereby effectively reducing the uplink interference of the NB-IoT system and effectively inhibiting the lifting of the base noise of the base station.
The present invention also provides a terminal transmission power control apparatus based on NB-IoT system, as shown in fig. 6, including:
and the judgment processing module 61 is configured to judge whether the first terminal performs coverage enhancement level upgrade.
If the judgment result is yes, the first terminal upgrades the coverage enhancement grade;
if the judgment result is negative, the first terminal continuously tries to access the base station according to the current coverage enhancement grade, and the function module executes again.
Optionally, the judgment processing module 61 may be specifically configured to:
acquiring the number of times of trying to access the lead code of the first terminal and the maximum number of times of trying to access the lead code of the current coverage enhancement level of the first terminal;
judging whether the number of times of trying to access the lead code is equal to the maximum number of times of trying to access the lead code;
if the judgment result is negative, the first terminal continuously tries to access the base station according to the current coverage enhancement grade, and the function module executes again.
If the judgment result is yes, further acquiring a signal receiving level value of a critical point of the current coverage enhancement level and the next coverage enhancement level of the first terminal and a preset signal receiving level floating value, acquiring a difference value of the signal receiving level value and the preset signal receiving level floating value, and then judging whether the terminal signal receiving level of the first terminal is less than or equal to the difference value;
if the judgment result is negative, the first terminal continuously tries to access the base station according to the current coverage enhancement grade, and the function module executes again.
If the determination result is yes, it is determined that the first terminal performs coverage enhancement level upgrade, and the determination result is sent to the obtaining module 62.
And an obtaining module 62, configured to, when the determination result of the determining module 61 is yes, obtain the number of terminals of the second terminal that are within a preset distance range from the first terminal and meet the signal receiving level condition.
Optionally, the signal reception level condition may specifically be:
the signal receiving level of the terminal is in a signal receiving level floating threshold interval corresponding to the first terminal;
optionally, the obtaining module 62 may be specifically configured to:
determining a third terminal within a preset distance range from the first terminal;
judging whether the signal receiving level of the third terminal is within a signal receiving level floating threshold interval corresponding to the first terminal;
and if the judgment result is negative, not counting the number of the second terminals.
And if the judgment result is yes, adding 1 to the terminal number count of the second terminal.
A first determining module 63, configured to determine a preamble power offset of the first terminal according to the number of terminals acquired by the acquiring module.
Optionally, the first determining module 63 may specifically be configured to:
the preamble power offset is calculated using the following equation: DELTA _ PREAMBLE ═ Δ {1+ min [10(NUM _ RSRP/step)%, 1] };
wherein DELTA _ PREAMBLE is a PREAMBLE power offset; delta is a preset target signal receiving level floating value; NUM _ RSRP is the number of the second terminals; step is the step value.
And a second determining module 64, configured to determine the transmit power of the first terminal according to the preamble power offset determined by the first determining module and the first terminal path loss.
The second determination module 64 may be specifically configured to:
calculating the transmission power of the first terminal by adopting the following formula:
PNPRACH＝min{PCMAX-N，C(a)，NPRTP+PLc}dBm；
wherein, PNPRACHIs the transmit power of the first terminal; pCMAX-N，C(a)A terminal maximum transmit power configured at subframe a for the NB-IoT system for serving cell C; NPRTP is narrowband reference signal received power; the PLc is the path loss from the base station to the first terminal;
wherein plcc RSRP _ UE _ CELi-RS;
RSRP _ UE _ CELi is the signal reception level of the first terminal at the ith coverage enhancement level CELi; RS is a reference level of the power of the transmitted signal of the base station; wherein i is an integer, and i is more than or equal to 0 and less than or equal to 1;
NPRTP＝Preamble_IRTP+DELTA_PREAMBLE+(Preamble_TC-1)*PR_Step-10*1g(numRPPA)；
preamble _ IRTP is Preamble initial target received power, DELTA _ Preamble is Preamble power offset; preamble _ TC is the access frequency of the first terminal; PR _ Step is a power increment Step; numRPPA is the number of preamble retransmissions.
All relevant contents of the steps related to the above method embodiments may be referred to the functional description of the corresponding functional module, and the functions thereof are not described herein again.
In the case of adopting an integrated module, the terminal transmission power control device based on the NB-IoT system comprises: the device comprises a storage unit, a processing unit and an interface unit. The processing unit is configured to control and manage actions of the NB-IoT system-based terminal transmission power control apparatus, for example, the processing unit is configured to execute the steps in fig. 2, fig. 3, and fig. 5 on the basis of the NB-IoT system-based terminal transmission power control apparatus. The interface unit is used for controlling the interaction of the device and other devices based on the terminal transmission power of the NB-IoT system; and the storage unit is used for storing the code and the data of the terminal transmission power control device based on the NB-IoT system.
For example, the processing unit is a processor, the storage unit is a memory, and the interface unit is a communication interface. The terminal transmission power control device based on the NB-IoT system is shown in fig. 7, and includes a communication interface 701, a processor 702, a memory 703 and a bus 704, where the communication interface 701 and the processor 702 are connected to the memory 703 through the bus 704.
The processor 702 may be a general-purpose Central Processing Unit (CPU), a microprocessor, an Application-Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to control the execution of programs in accordance with the teachings of the present disclosure.
The Memory 703 may be a Read-Only Memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical disk storage, optical disk storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to these. The memory may be self-contained and coupled to the processor via a bus. The memory may also be integral to the processor.
The memory 703 is used for storing application program codes for executing the present application, and is controlled by the processor 702. The communication interface 701 is used to support the interaction of the NB-IoT system-based terminal transmission power control device with other devices. The processor 702 is configured to execute application program code stored in the memory 703 to implement the methods of embodiments of the present invention.
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. An embodiment of the present invention further provides a storage medium, which may include a memory for storing computer software instructions for an NB-IoT system-based terminal transmission power control apparatus, and the storage medium includes program codes designed to execute the NB-IoT system-based terminal transmission power control method. Specifically, the software instructions may be composed of corresponding software modules, and the software modules may be stored in a Random Access Memory (RAM), a flash Memory, a Read Only Memory (ROM), an Erasable Programmable Read Only Memory (EPROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), a register, a hard disk, a removable hard 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 embodiment of the present invention further provides a computer program, which can be directly loaded into the memory and contains software codes, and after the computer program is loaded and executed by the computer, the method for controlling the transmission power of the terminal based on the NB-IoT system can be implemented.
Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in this invention 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 description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A terminal transmission power control method based on an NB-IoT system is characterized by comprising the following steps:
judging whether the first terminal upgrades the coverage enhancement grade;
if so, acquiring the number of terminals of a second terminal which is within a preset distance range from the first terminal and meets the signal receiving level condition;
determining the lead code power offset of the first terminal according to the number of the terminals;
determining the transmitting power of the first terminal according to the lead code power offset and the path loss of the first terminal;
the signal receiving level condition is specifically as follows:
the signal receiving level of the second terminal is within the signal receiving level floating threshold interval corresponding to the first terminal;
the number of the terminals of the second terminal which is within the preset distance range from the first terminal and meets the signal receiving level condition is specifically:
determining a third terminal within a preset distance range from the first terminal;
judging whether the signal receiving level of the third terminal is within a signal receiving level floating threshold interval corresponding to the first terminal;
and if the judgment result is yes, adding 1 to the terminal number count of the second terminal.
2. The method for controlling terminal transmission power according to claim 1, wherein the determining the preamble power offset of the first terminal according to the number of terminals specifically comprises:
calculating the preamble power offset using the following equation: DELTA _ PREAMBLE ═ Δ {1+ min [10(NUM _ RSRP/step)%, 1] };
wherein DELTA _ PREAMBLE is the PREAMBLE power offset; delta is a preset target signal receiving level floating value; NUM _ RSRP is the number of the second terminals; step is the step value.
3. The method of claim 1 or 2, wherein the determining the transmit power of the first terminal according to the preamble power offset and the first terminal path loss specifically comprises:
calculating the transmission power of the first terminal by adopting the following formula:
PNPRACH＝min{PCMAX-N，C(a)，NPRTP+PLc}dBm；
wherein, PNPRACHIs the transmit power of the first terminal; pCMAX-N，C(a)A terminal maximum transmit power configured in subframe a for serving cell C for the NB-IoT system; NPRTP is narrowband reference signal received power; the PLc is the path loss from the base station to the first terminal;
wherein the PLc is RSRP _ UE _ CELi-RS;
RSRP _ UE _ CELi is the signal reception level of the first terminal at the ith coverage enhancement level CELi; RS is a reference level of the power of the transmitted signal of the base station; wherein i is an integer, and i is more than or equal to 0 and less than or equal to 1;
the NPRTP ═ Preamble _ IRTP + DELTA _ Preamble + (Preamble _ TC-1) × PR _ Step-10 × 1g (numrppa);
preamble _ IRTP is Preamble initial target received power, DELTA _ Preamble is Preamble power offset; preamble _ TC is the access frequency of the first terminal; PR _ Step is a power increment Step; numRPPA is the number of preamble retransmissions.
4. The method as claimed in claim 1, wherein the determining whether the first terminal performs coverage enhancement level upgrade includes:
acquiring the number of times of trying to access the lead code of the first terminal and the maximum number of times of trying to access the lead code of the current coverage enhancement level of the first terminal;
judging whether the number of times of trying to access the lead code is equal to the maximum number of times of trying to access the lead code;
if the judgment result is yes, further acquiring a signal receiving level value of a critical point of the current coverage enhancement grade and the next coverage enhancement grade of the first terminal and a preset signal receiving level floating value;
acquiring a difference value between the signal receiving level value and the preset signal receiving level floating value;
judging whether the terminal signal receiving level of the first terminal is less than or equal to the difference value;
and if so, judging that the first terminal upgrades the coverage enhancement level.
5. An NB-IoT system-based terminal transmission power control apparatus, comprising:
the judging and processing module is used for judging whether the first terminal upgrades the coverage enhancement grade;
the acquisition module is used for acquiring the number of terminals of the second terminal which are within a preset distance range from the first terminal and meet the signal receiving level condition if the judgment result of the judgment processing module is positive;
a first determining module, configured to determine a preamble power offset of the first terminal according to the number of terminals acquired by the acquiring module;
a second determining module, configured to determine the transmit power of the first terminal according to the preamble power offset determined by the first determining module and the first terminal path loss;
the signal receiving level condition is specifically as follows:
the signal receiving level of the second terminal is within the signal receiving level floating threshold interval corresponding to the first terminal;
the obtaining module is specifically configured to:
determining a third terminal within a preset distance range from the first terminal;
judging whether the signal receiving level of the third terminal is within a signal receiving level floating threshold interval corresponding to the first terminal;
and if the judgment result is yes, adding 1 to the terminal number count of the second terminal.
6. The terminal transmission power control apparatus of claim 5, wherein the first determining module is specifically configured to:
calculating the preamble power offset using the following equation: DELTA _ PREAMBLE ═ Δ {1+ min [10(NUM _ RSRP/step)%, 1] };
wherein DELTA _ PREAMBLE is the PREAMBLE power offset; delta is a preset target signal receiving level floating value; NUM _ RSRP is the number of the second terminals; step is the step value.
7. The terminal transmission power control apparatus of claim 5 or 6, wherein the second determining module is specifically configured to:
calculating the transmission power of the first terminal by adopting the following formula:
PNPRACH＝min{PCMAX-N，C(a)，NPRTP+PLc}dBm；
wherein, PNPRACHIs the transmit power of the first terminal; pCMAX-N，C(a)A terminal maximum transmit power configured in subframe a for serving cell C for the NB-IoT system; NPRTP is narrowband reference signal received power; the PLc is the path loss from the base station to the first terminal;
wherein the PLc is RSRP _ UE _ CELi-RS;
RSRP _ UE _ CELi is the signal reception level of the first terminal at the ith coverage enhancement level CELi; RS is a reference level of the power of the transmitted signal of the base station; wherein i is an integer, and i is more than or equal to 0 and less than or equal to 1;
the NPRTP ═ Preamble _ IRTP + DELTA _ Preamble + (Preamble _ TC-1) × PR _ Step-10 × 1g (numrppa);
preamble _ IRTP is Preamble initial target received power, DELTA _ Preamble is Preamble power offset; preamble _ TC is the access frequency of the first terminal; PR _ Step is a power increment Step; numRPPA is the number of preamble retransmissions.
8. The apparatus for controlling terminal transmission power according to claim 5, wherein the determining and processing module is specifically configured to:
acquiring the number of times of trying to access the lead code of the first terminal and the maximum number of times of trying to access the lead code of the current coverage enhancement level of the first terminal;
judging whether the number of times of trying to access the lead code is equal to the maximum number of times of trying to access the lead code;
if the judgment result is yes, further acquiring a signal receiving level value of a critical point of the current coverage enhancement grade and the next coverage enhancement grade of the first terminal and a preset signal receiving level floating value;
acquiring a difference value between the signal receiving level value and the preset signal receiving level floating value;
judging whether the terminal signal receiving level of the first terminal is less than or equal to the difference value;
and if so, judging that the first terminal upgrades the coverage enhancement level.
9. An NB-IoT system-based terminal transmission power control apparatus, comprising: one or more processors; the processor is configured to execute computer program code in the memory, the computer program code comprising instructions to execute the NB-IoT system based terminal transmit power control apparatus to perform the NB-IoT system based terminal transmit power control method of any of claims 1-4.
10. A storage medium storing instruction codes for performing the NB-IoT system-based terminal transmission power control method as set forth in any one of claims 1-4.
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