CN109862611B - Terminal power control method and device - Google Patents
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Abstract
The application provides a terminal power control method and device, relates to the field of communication, and aims to reduce uplink interference and inhibit lifting of base station bottom noise when a first terminal upgrades a coverage enhancement level. The method comprises the following steps: if the first terminal is determined to upgrade the coverage enhancement level, determining the lead code power offset of the first terminal according to the number of terminals in a first area and the number of terminals in a second area; and determining the transmitting power of the first terminal according to the preamble code power offset and the path loss of the first terminal.
Description
Technical Field
The present application relates to the field of communications, and in particular, to a method and an apparatus for controlling terminal power.
Background
The narrowband internet of things (NB-IoT) is an Internet of things technology based on 3GPP LTE standard protocol evolution, mainly faces to the application scenarios of the Internet of things with medium-low speed, deep coverage, low power consumption and large connection, and has the technical advantages of high utilization rate of frequency spectrum resources, support of a large number of medium-low speed users, large coverage depth, low power consumption of terminals and the like.
As shown in fig. 1, the network architecture of the NB-IoT system includes: a terminal (e.g., user equipment, UE), a base station (e.g., eNodeB), a packet core network (EPC), an IoT platform (connection management platform), and an application server of the NB-IoT system. Currently, the NBIoT system supports three Coverage Enhancement Levels (CEL), as shown in fig. 2, CEL0, CEL1, and CEL 2.
The prior art CEL0, CEL1 and CEL2 are defined in the following manner: with a base station eNodeB as a center, the coverage enhancement level of a terminal in an area range where Reference Signal Receiving Power (RSRP) is less than 144dB (decibel) is CEL 0; the level of coverage enhancement for terminals in the region of RSRP greater than 144dB and less than 154dB is CEL1, and the level of coverage enhancement for terminals in the region of RSRP greater than 154dB and less than 164dB is CEL 2.
The NB-IoT uplink channel includes two physical channels, one is a Narrowband Physical Uplink Shared Channel (NPUSCH), and the other is a Narrowband Physical Random Access Channel (NPRACH). The NPRACH is an access channel when the terminal starts to initiate a call. NPRACH sets a fixed number of information repetitions for different coverage enhancement levels (the higher the coverage level, the larger the number of repetitions). In this process, the terminal may adjust its transmit power to meet the requirements of coverage enhancement level upgrade.
Based on the above rules, under the coverage enhancement level CELi (i is an integer, and i is greater than or equal to 0 and less than or equal to 2), 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 terminal cannot access the base station after accessing the base station at a certain coverage enhancement level and reaching the fixed information repetition number, the terminal will increase from the current coverage enhancement level to a higher coverage enhancement level and try to access again. 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 higher uplink interference generated by the terminal after upgrading the coverage enhancement level in the NBIoT system, and severe base station noise rise, 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.
Disclosure of Invention
The application provides a terminal power control method and device, which can reduce uplink interference and inhibit the base noise of a base station from being raised.
In order to achieve the purpose, the technical scheme is as follows:
in a first aspect, the present application provides a terminal power control method, which may include: if the first terminal is determined to upgrade the coverage enhancement level, determining the lead code power offset of the first terminal according to the number of terminals in a first area and the number of terminals in a second area, wherein the first area is an area where the interference intensity generated by the first terminal is smaller than or equal to a first threshold value, and the second area is an area where the interference intensity generated by the first terminal is larger than the first threshold value and smaller than a second threshold value; and determining the transmitting power of the first terminal according to the preamble code power offset and the path loss of the first terminal.
In a second aspect, the present application provides an apparatus comprising: the device comprises a first processing module and a second processing module. The first processing module is configured to determine, if it is determined that the first terminal performs coverage enhancement level upgrade, a preamble power offset of the first terminal according to a terminal number of a first area and a terminal number of a second area, where the first area is an area where interference strength generated by the first terminal is less than or equal to a first threshold, and the second area is an area where the interference strength generated by the first terminal is greater than the first threshold and less than a second threshold; and the second processing module is used for determining the transmitting power of the first terminal according to the preamble code power offset and the path loss of the first terminal.
In a third aspect, the present application provides an apparatus comprising: a processor, a transceiver, and a memory. Wherein the memory is used to store one or more programs. The one or more programs include computer executable instructions which, when executed by the apparatus, cause the apparatus to perform the terminal power control method of the first aspect and any of its various alternative implementations.
In a fourth aspect, the present application provides a computer-readable storage medium, which stores instructions that, when executed by a computer, cause the computer to perform the terminal power control method according to any one of the first aspect and various alternative implementations thereof.
In a fifth aspect, the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the terminal power control method of the first aspect and any of its various alternative implementations.
According to the terminal power control method and device provided by the application, if the first terminal is determined to upgrade the coverage enhancement level, the lead code power offset of the first terminal is determined according to the number of terminals in a first area and the number of terminals in a second area; and determining the transmitting power of the first terminal according to the lead code power offset and the path loss of the first terminal, so that the transmitting power of the first terminal is adaptive to the coverage enhancement level and the number of terminals in the peripheral area, thereby reducing uplink interference and inhibiting the lifting of the base station bottom noise.
Drawings
Fig. 1 is a schematic diagram of a network architecture to which a terminal power control method and apparatus according to an embodiment of the present invention are applied;
FIG. 2 is a schematic diagram of coverage enhancement levels provided by an embodiment of the present application;
fig. 3 is a schematic diagram of a terminal power control method according to an embodiment of the present application;
fig. 4 is a first schematic diagram of region division provided in the embodiment of the present application;
fig. 5 is a schematic diagram of region division provided in the embodiment of the present application;
FIG. 6 is a first schematic structural diagram of an apparatus according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a device according to an embodiment of the present application.
Detailed Description
The following describes a method, an apparatus, and a system for controlling terminal power according to embodiments of the present application in detail with reference to the accompanying drawings.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone.
The terms "first" and "second" and the like in the description and drawings of the present application are used for distinguishing different objects or for distinguishing different processes for the same object, and are not used for describing a specific order of the objects.
Furthermore, the terms "including" and "having," and any variations thereof, as referred to in the description of the present application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. 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.
In the description of the present application, the meaning of "a plurality" means two or more unless otherwise specified.
An embodiment of the present application provides a terminal power control method, as shown in fig. 3, the method may include S101 to S103:
s101, judging whether the first terminal upgrades the coverage grade.
The first terminal, that is, an NB-IoT terminal in the NB-IoT system, may specifically be a user equipment UE, for example: a cell phone, a computer, a wireless phone, a Session Initiation Protocol (SIP) phone, a smart phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a tablet, a laptop, a handheld communication device, a handheld computing device, a satellite radio, a wireless modem card, a Set Top Box (STB), a Customer Premises Equipment (CPE), and/or other devices for communicating over a wireless system.
Specifically, the number of times of attempted access of the preamble of the first terminal and the maximum number of times of attempted access of the preamble of the current coverage enhancement level of the first terminal are obtained. The number of times of preamble attempt access (num preamble attach 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 to access (max num preamble admission ce), that is, the maximum number of attempts allowed by the base station side to access the base station side by the first terminal under the current coverage level. In a specific implementation, in the NB-IoT system, for three coverage enhancement classes CEL0, CEL1, and CEL2, a resource configuration parameter corresponding to each coverage enhancement class is configured, and the maximum number of times of attempted preamble access is included in the resource configuration parameters.
Then, 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 not, continuing trying to access the base station by the first terminal according to the current coverage enhancement level; if the judgment result is yes, acquiring the reference signal received power of the critical point of the current coverage enhancement grade and the next coverage enhancement grade of the first terminal and a preset reference signal received power 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), and the reference signal received power at the critical point of the next coverage enhancement level is RSRPi. And simultaneously setting a preset reference signal received power floating value as Delta RSRP.
Then, whether the terminal reference signal received power of the first terminal is smaller than or equal to the difference value between the reference signal received power and a preset reference signal received power floating value is judged, namely whether RSRP _ UE _ CEi is less than or equal to RSRP-Delta RSRP is judged. If the judgment result is negative, the first terminal continuously tries to access the base station according to the current coverage enhancement grade; if the determination result is yes, the first terminal performs upgrade of the coverage enhancement level, and step S103 is executed.
The preset reference signal received power floating value may be set by a person skilled in the art according to actual conditions, and the present application is not limited thereto.
S102, determining the lead code power offset of the first terminal according to the number of the terminals in the first area and the number of the terminals in the second area.
The first area is an area where the interference intensity generated by the first terminal is less than or equal to a first threshold, and the second area is an area where the interference intensity generated by the first terminal is greater than the first threshold and less than a second threshold.
Specifically, the interference strength generated by the first terminal may be characterized by RSRP received by the first terminal, that is, different regions are divided according to the RSRP received by the first terminal by other terminals. Illustratively, the first region is a region where RSRP of the first terminal is less than or equal to 3dBm and received by other terminals in the region, and the second region is a region where RSRP of the first terminal is greater than 3dBm and less than or equal to 9dBm and received by other terminals in the region.
Then, the number of all terminals in the first area N1 and the number of all terminals in the second area N2 are determined.
Then, the preamble power offset is calculated using the following formula:
the PREAMBLE power offset DELTA _ PREAMBLE ═ Δ × 1-N1/(N1+ N2) ], where Δ is a preset target signal received power float value. The preset target signal received power floating value can be set by those skilled in the art according to practical situations, and the present application is not limited thereto.
It should be noted that, as shown in fig. 4, under the same transmission power, the interference on the terminal at the position closer to the first terminal is stronger, so that under the condition that the number of terminals in the second area is certain, and the ratio of the number of terminals in the first area closer to the first terminal is larger, the value of DELTA _ PREAMBLE should be smaller, so as to reduce the interference on the surrounding terminals due to too large transmission power.
S103, determining the transmitting power of the first terminal according to the preamble code power offset and the path loss of the first terminal.
Specifically, the following formula is adopted to calculate the transmission power of the first terminal:
PNPRACH＝min{PCMAX-N.C(i)，NPRTP+PLc}[dBm]，
wherein, PNPRACHIs the transmit power of the first terminal; pCMAX-N.C(i)Configuring the maximum transmission power of a terminal in a subframe i (i is an integer and is more than or equal to 0 and less than or equal to 1) aiming at a service cell C for an NB-IoT system; NPRTP is narrowband reference signal received power; the PLc is the path loss from the base station to the first terminal. The above formula represents the transmission power P of the first terminalNPRACHIs equal to PCMAX-N.C(i)And the minimum of the sum of NPRTP, PLc. According to the method and the device, the minimum value is selected from the two values to determine the transmitting power of the first terminal, so that the transmitting power of the first terminal is matched with the actual path loss from the base station to the terminal, and compared with the prior art, the interference intensity of the power transmission of the first terminal to surrounding terminals is reduced.
The plcs RSRP _ UE _ CELi-RS,
wherein RSRP _ UE _ CELi is RSRP of the first terminal at the ith coverage enhancement level CELi. RS is the base station transmit signal power reference level.
The NPRTP ═ Preamble _ IRTP + DELTA _ Preamble + (Preamble _ TC-1) × PR _ Step-10 × (numRPPA),
wherein, Preamble _ IRTP is Preamble initial target received power; DELTA _ PREAMBLE is the PREAMBLE power offset obtained in step S102; preamble _ TC is the access frequency of the first terminal; PR _ Step is a preset power increment Step; numRPPA is the number of preamble retransmissions.
Optionally, in the step S102, the method may further be divided into three regions: the RSRP received by the terminal position from the first terminal is taken as a reference, and the RSRP is divided into three regions, namely RSRP less than 3dBm, 3dBm less than RSRP less than 6dBm, and 6dBm less than RSRP less than 9 dBm. Ideally, the RSRP from the first terminal received by the terminal location is proportional to its distance from the first terminal. Therefore, as shown in fig. 5, three circles are formed with the first terminal position as the center, and the radii of the three circles are R1, R2, and R3, respectively, and correspond to positions with RSRP of 3dBm, 6dBm, and 9dBm, respectively. Thus, the three regions RSRP < 3dBm, 3dBm < RSRP < 6dBm, 6dBm < RSRP < 9dBm can be represented as a circle (radius R1) and two rings (ring widths R2-R1 and R3-R2, respectively) centered at the first terminal position. The circular area and the two annular areas are sequentially set as a first area, a second area and a third area from near to far according to the distance between the circular area and the first terminal.
Accordingly, the step of determining DELTA _ PREAMBLE is as follows:
first, the terminal density per unit area within a circle having R3 as a radius from the first terminal as a center is calculated using the following formula:
ρ＝Num_total_R3/(R3)2，
wherein ρ is the user density per unit area; num _ total _ R3Is the total number of terminals within the circle;
then, the preamble power offset is calculated using the following formula:
A＝Num_total_R1/ρ，
B＝Num_total_R2-1/ρ，
C＝Num_total_R3-2/ρ，
the PREAMBLE power offset DELTA _ PREAMBLE ═ Δ x [1-a/(a + B + C) ],
wherein, Num _ total _ R1The number of all terminals in the first area is the number of all terminals in the first area; num _ total _ R2-1The number of all terminals in the second area is obtained; num _ total _ R3-2The number of all terminals in the third area is; and delta is a preset reference signal received power floating value.
According to the terminal power control method, when the coverage enhancement level of the first terminal is upgraded, the lead code power offset of the first terminal is determined according to the number of terminals in the first area and the number of terminals in the second area, then the transmitting power of the first terminal is determined according to the lead code power offset and the path loss of the first terminal, so that the transmitting power of the first terminal is adaptive to the coverage enhancement level and the number of terminals in the peripheral area, uplink interference is reduced, and lifting of base station bottom noise is inhibited.
In the embodiment of the present application, the device may be divided into the functional modules or the functional units according to the method example, for example, each functional module or functional unit may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module may be implemented in a form of hardware, or may be implemented in a form of a software functional module or a functional unit. The division of the modules or units in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation.
Fig. 6 shows a schematic view of a possible configuration of the device according to the above-described embodiment. The device comprises a first processing module 201 and a second processing module 202.
The first processing module 201 is configured to determine, if it is determined that the first terminal performs coverage enhancement level upgrade, a preamble power offset of the first terminal according to a number of terminals in a first area and a number of terminals in a second area, where the first area is an area where interference strength generated by the first terminal is less than or equal to a first threshold, and the second area is an area where the interference strength generated by the first terminal is greater than the first threshold and less than a second threshold.
The second processing module 202 is configured to determine the transmit power of the first terminal according to the preamble power offset and the first terminal path loss.
Optionally, the first processing module 201 determines that the first terminal performs coverage enhancement level upgrade if the access frequency of the first terminal reaches the maximum access frequency and the reference signal received power RSRP of the first terminal is less than the preset RSRP.
Optionally, the first processing module 202 is further configured to determine the number of terminals in the first area and the second area; calculating the preamble power offset using the following equation: the preamble power offset is Δ × [1 — the number of terminals in the first region/(the number of terminals in the first region + the number of terminals in the second region) ], where Δ is a preset reference signal received power float value.
Optionally, the second processing module 202 is further configured to adoptCalculating the transmission power of the first terminal by using the following formula: PNPRACH min { P ═CMAX-N.C(i)，NPRTP+PLc}[dBm](ii) a The PNPRACH is the transmitting power of the first terminal; pCMAX-N.C(i)A terminal maximum transmit power configured for the NB-IoT system at subframe i 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 the PLc is RSRP _ UE _ CELi-RS; the RSRP _ UE _ CELi is the RSRP of the first terminal under 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 × (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.
Fig. 7 shows a schematic diagram of still another possible structure of the terminal power control apparatus in the above embodiment. The device includes: a processor 301 and a communication interface 302. The processor 301 is configured to control and manage the actions of the apparatus, for example, perform the steps performed by the first processing module 201, the second processing module 202, and/or other processes for performing the techniques described herein. The communication interface 302 is used to support communication of the device with other network entities. The apparatus may further comprise a memory 303 and a bus 304, the memory 303 being arranged to store program codes and data of the apparatus.
Wherein the memory 303 may be a memory in a device or the like, which may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as read-only memory, flash memory, a hard disk, or a solid state disk; the memory may also comprise a combination of memories of the kind described above.
The processor 301 may be various illustrative logical blocks, modules, and circuits described above that implement or perform the functions described in connection with the present disclosure. The processor may be a central processing unit, general purpose processor, digital signal processor, application specific integrated circuit, field programmable gate array or other programmable logic device, transistor logic device, hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others.
The bus 304 may be an Extended Industry Standard Architecture (EISA) bus or the like. The bus 304 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 7, but this is not intended to represent only one bus or type of bus.
An embodiment of the present application further provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the network device executes the instructions, the network device executes each step executed by the network device in the method flow shown in the foregoing method embodiment.
The computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a register, a hard disk, an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing, or any other form of computer readable 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 Application Specific Integrated Circuit (ASIC). In embodiments of the present application, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. A terminal power control method, comprising:
if the first terminal is determined to upgrade the coverage enhancement level, determining the lead code power offset of the first terminal according to the number of terminals in a first area and the number of terminals in a second area, wherein the first area is an area where the interference intensity generated by the first terminal is smaller than or equal to a first threshold value, and the second area is an area where the interference intensity generated by the first terminal is larger than the first threshold value and smaller than a second threshold value;
the interference strength generated by the first terminal is characterized by the RSRP received by the first terminal by other terminals;
drawing a circle by taking the first terminal as a circle center and taking R1, R2 and R3 as radiuses to form three circles, namely R1, R2 and R3 from inside to outside; taking a circle with the radius of R1 as the center of a circle at the first terminal position as a first area, taking an annular with the ring width of R2-R1 as a second area, and taking an annular with the ring width of R3-R2 as a third area;
calculating the preamble power offset using the following equation:
A＝Num_total_R1/ρ，
B＝Num_total_R2-1/ρ，
C＝Num_total_R3-2/ρ，
the PREAMBLE power offset DELTA _ PREAMBLE ═ Δ x [1-a/(a + B + C) ];
wherein, Num _ total _ R1Is the first regionThe number of all terminals in the domain;
Num_total_R2-1the number of all terminals in the second area is obtained; num _ total _ R3-2The number of all terminals in the third area is; the method comprises the following steps that delta is a preset reference signal receiving power floating value, and rho is unit area user density;
and determining the transmitting power of the first terminal according to the preamble code power offset and the path loss of the first terminal.
2. The method of claim 1, wherein the determining that the first terminal performs coverage enhancement level upgrade comprises:
and if the access times of the first terminal reach the maximum access times and the Reference Signal Received Power (RSRP) of the first terminal is smaller than the preset RSRP, determining that the first terminal carries out upgrading of the coverage enhancement grade.
3. The method of any of claims 1-2, wherein the determining the transmit power of the first terminal based on the preamble power offset and a first terminal path loss comprises:
calculating the transmission power of the first terminal by adopting the following formula:
PNPRACH＝min{PCMAX-N.C(i)，NPRTP+PLc}[dBm]；
wherein, PNPRACHIs the transmit power of the first terminal; pCMAX-N.C(i)A terminal maximum transmit power configured for the NB-IoT system at subframe i 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 the PLc is RSRP _ UE _ CELi-RS;
the RSRP _ UE _ CELi is the RSRP of the first terminal under 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 × (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. A terminal power control apparatus, comprising:
the first processing module is configured to determine, if it is determined that the first terminal performs coverage enhancement level upgrade, a preamble power offset of the first terminal according to a number of terminals in a first area and a number of terminals in a second area, where the first area is an area where interference strength generated by the first terminal is less than or equal to a first threshold, and the second area is an area where the interference strength generated by the first terminal is greater than the first threshold and less than a second threshold;
the interference strength generated by the first terminal is characterized by the RSRP received by the first terminal by other terminals;
the first processing module is further configured to:
drawing a circle by taking the first terminal as a circle center and taking R1, R2 and R3 as radiuses to form three circles, namely R1, R2 and R3 from inside to outside; taking a circle with the radius of R1 as the center of a circle at the first terminal position as a first area, taking an annular with the ring width of R2-R1 as a second area, and taking an annular with the ring width of R3-R2 as a third area;
calculating the preamble power offset using the following equation:
A＝Num_total_R1/ρ，
B＝Num_total_R2-1/ρ，
C＝Num_total_R3-2/ρ，
the PREAMBLE power offset DELTA _ PREAMBLE ═ Δ x [1-a/(a + B + C) ];
wherein, Num _ total _ R1The number of all terminals in the first area is the number of all terminals in the first area;
Num_total_R2-1the number of all terminals in the second area is obtained; num _ total _ R3-2The number of all terminals in the third area is; delta is a preset reference signal received power floating value, and rho is a unit areaA user density; and the second processing module is used for determining the transmitting power of the first terminal according to the preamble code power offset and the path loss of the first terminal.
5. The apparatus of claim 4,
the first processing module is further configured to determine that the first terminal performs coverage enhancement level upgrade if the access frequency of the first terminal reaches the maximum access frequency and reference signal received power RSRP of the first terminal is less than a preset RSRP.
6. The apparatus according to any one of claims 4 to 5,
the second processing module is further configured to calculate the transmission power of the first terminal by using the following formula:
PNPRACH＝min{PCMAX-N.C(i)，NPRTP+PLc}[dBm]；
wherein, PNPRACHIs the transmit power of the first terminal; pCMAX-N.C(i)A terminal maximum transmit power configured for the NB-IoT system at subframe i 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 the PLc is RSRP _ UE _ CELi-RS;
the RSRP _ UE _ CELi is the RSRP of the first terminal under 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 × (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.
7. An apparatus for controlling power of a terminal, the apparatus comprising: a processor, a transceiver, and a memory; wherein the memory is used for storing one or more programs; the one or more programs include computer executable instructions that, when executed by the apparatus, cause the apparatus to perform the terminal power control method of any of claims 1 to 3 by executing the computer executable instructions stored by the memory.
8. A computer-readable storage medium, wherein instructions are stored in the computer-readable storage medium, and when the instructions are executed by a computer, the computer performs the terminal power control method according to any one of claims 1 to 3.
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